HUMIDITY ADJUSTING DEVICE AND HUMIDITY ADJUSTING METHOD

Abstract

A humidity adjustment device (10) according to the present disclosure includes a control unit (11) that acquires humidity information indicating humidity of a space part of a manhole and controls the humidity on the basis of the humidity information.

Description

TECHNICAL FIELD

The present disclosure relates to a humidity adjustment device and a humidity adjustment method.

BACKGROUND ART

Reinforced concrete having high strength is often used in structures such as buildings. In recent years, the deterioration phenomenon of reinforced concrete has become a social problem. One of the deterioration phenomena is a neutralization. The Neutralization is the phenomenon in which concrete, which was alkaline during placing, gradually becomes neutral by carbon dioxide in the atmosphere. The neutralization phenomenon progresses from the surface of concrete in contact with the air. The reinforcement in the reinforced concrete forms a passive state in an alkaline environment, so that corrosion does not progress, but corrosion progresses in the neutral environment. The strength of the reinforced concrete is reduced by the corrosion and thickness reduction of the inside reinforcing bars by the neutralization. As a method for suppressing the neutralization, for example, PTL 1 discloses a method for making a material resistant to the neutralization by devising the blending of concrete. In PTL 2, a method for preventing the carbon dioxide from entering by processing the surface of concrete is disclosed.

CITATION LIST

Patent Literature

• [PTL 1] Japanese Patent Application Publication No. 2019-147736
• [PTL 2] Japanese Patent Application Publication No. 2011-256065

SUMMARY OF INVENTION

Technical Problem

However, a method for controlling the blending of concrete tends to increase the cost, and cannot be used for already placed reinforced concrete. The surface processing method may be undesirable from the viewpoint of the concern of the influence on the human body and the view. In addition, the surface processing is peeled off by weathering or the like, and the effect may be lost. In this way, it may not be effective to change the blending of concrete or to apply surface processing. Therefore, a method for suppressing the neutralization of concrete by changing an environment in which concrete exists without using the method for changing the blending p of concrete or the method for applying surface processing has been desired. Among them, since the humidity in the environment is a factor of largely contributing to the neutralization progress speed of concrete and the control of the humidity is particularly effective for the reinforced concrete existing in a closed space, a humidity adjustment device capable of controlling the humidity in the environment where a manhole made of the reinforced concrete exists has been desired.

An object of the present disclosure made in view of such circumstances is to provide a humidity adjustment device and a humidity adjustment method capable of controlling the humidity in the manhole made of the reinforced concrete.

Solution to Problem

In order to solve the above problem, a humidity adjustment device according to the present disclosure includes a control unit that acquires humidity information indicating humidity of a space part of a manhole and controls the humidity on the basis of the humidity information.

The humidity adjustment method according to the present disclosure includes a step of acquiring the humidity information indicating the humidity of the space part of the manhole, and a step of controlling the humidity on the basis of the humidity information.

Advantageous Effects of Invention

According to the present disclosure, the humidity in the reinforced concrete manhole can be controlled.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram showing an outline of a system including a humidity adjustment device according to a first embodiment of the present disclosure.

FIG. 2 is a diagram showing a configuration example of a manhole.

FIG. 3 is a block diagram showing a configuration of the system including the humidity adjustment device according to the first embodiment of the present disclosure.

FIG. 4 is a diagram showing an operation example of the system including the humidity adjustment device according to the first embodiment of the present disclosure.

FIG. 5 is a flowchart showing the operation of a control unit of the humidity adjustment device according to the first embodiment of the present disclosure.

FIG. 6 is a diagram showing an outline of a system including a humidity adjustment device according to a second embodiment of the present disclosure.

FIG. 7 is a block diagram showing a configuration of a system including the humidity adjustment device according to the second embodiment of the present disclosure.

FIG. 8 is a diagram showing an application example of the humidity adjustment device according to the second embodiment of the present disclosure.

FIG. 9 is a diagram showing an operation example of the system including the humidity adjustment device according to the second embodiment of the present disclosure.

FIG. 10 is a flowchart showing the operations of a control unit of the humidity adjustment device according to the second embodiment of the present disclosure.

DESCRIPTION OF EMBODIMENTS

Hereinafter, a embodiment of the present disclosure will be described with reference to the drawings. The embodiments to be described below are configuration examples of the present disclosure and are not intended to limit the present disclosure.

First Embodiment

An outline of a system 1 according to a first embodiment of the present disclosure will be described with reference to FIG. 1. As shown in FIG. 1, the system 1 includes, in a manhole M, a humidity adjustment device 10, a humidifier 20, a space part thermo-hygrometer 30 and an inner wall surface thermometer 40. The humidity adjustment device 10 includes a control unit 11, a storage unit 12, a communication unit 13, an input unit 14, and an output unit 15. The humidity adjustment device 10, the humidifier 20, the space part thermo-hygrometer 30, and the inner wall surface thermometer 40 are connected to be communicable by wire or wireless. There is no particular limitation on the communication method for transmitting/receiving of information between the humidity adjustment device 10, the humidifier 20, the space part thermo-hygrometer 30, and the inner wall surface thermometer 40. The humidity adjustment device 10 may be installed outside the manhole M.

The configuration of the manhole M will be briefly described here with reference to FIG. 2. The manhole M is an underground structure made of the reinforced concrete. The manhole M includes a neck part 210, a frame part 220, and an iron cover 230. The frame part 220 includes a ceiling part 221, a floor part 222, and a side wall part 223. The neck part 210 is connected to the ceiling part 221 of the frame part 220. A space part S exists in the frame part 220, and the space part S is surrounded by an inner wall surface I. The inner wall surface I includes a ceiling surface R of the ceiling part 221, a side wall surface H of the side wall part 223, and a floor surface F of the floor part 222. One end of the neck part 210 is connected to the ceiling surface R of the frame part 220, and the other end of the neck part 210 is exposed to the ground. The frame part 220 and the neck part 210 are made from the reinforced concrete.

Referring back to FIG. 1, the humidifier 20, the space part thermo-hygrometer 30 and the inner wall surface thermometer 40 will be described.

The humidifier 20 discharges moisture in the space part S of the manhole M and humidifies the space part S. As disclosed in the following Literature 1, it has been found that the humidity in the environment is a factor that greatly contributes to the rate of progress of the neutralization of concrete. Therefore, in this embodiment, the humidity of the space part S is controlled by the humidifier 20. Literature 1: Toshio Shirakawa, and two others, “A study on Carbonation of Concrete by Influence of Humidity”, Proceeding of the Japan Concrete Institute, Vol. 18, No. 1, 1996

In this embodiment, the humidifier 20 is a steam type humidifier. The humidifier 20 is not limited to this, but may be an ultrasonic type humidifier or a vaporization type humidifier. The humidifier 20 includes a heater, an evaporation pan, a fan, an openable/closable jetting port, a water supply tank and a control unit. The control unit of the humidifier 20 controls the heater, the fan and the jetting port. In the humidifier 20, water is supplied from the water supply tank to the evaporation pan, and a heater provided on a bottom surface of the evaporation pan heats the water. The heated and evaporated water is discharged to the outside from the jetting port by the fan to humidify the space part S. The discharge amount of moisture from the humidifier 20 is adjusted by opening and closing the jetting port. The water supply tank supplies water to the evaporation pan from above the evaporation pan. A water supply valve is provided at the bottom of the water supply tank, and when the water supply tank is installed, a push-in pin provided on the evaporation pan pushes up the water supply valve from below. Thus, the water supply valve is opened, and water is supplied to the evaporation pan. The control unit of the humidifier 20 controls the operation of the whole humidifier 20 according to an instruction received from the control unit 11 of the humidity adjustment device 10.

The space part thermo-hygrometer 30 is an equipment for measuring the temperature and humidity of the space part S of the manhole M. The space part thermo-hygrometer 30 includes a temperature and humidity sensor, a control unit, a storage unit, and a communication unit. The temperature and humidity sensor detects the temperature and humidity of the space part S, and stores the detected temperature and humidity in the storage unit as space part temperature information and humidity information, respectively. The control unit transmits the space part temperature information and the humidity information to the humidity adjustment device 10 via the communication unit. The space part temperature information and the humidity information may be transmitted at all times or may be transmitted in response to an instruction from the humidity adjustment device 10. In the present embodiment, the space part thermo-hygrometer 30 is mounted on the side wall surface H of the manhole M, but the position of the space part thermo-hygrometer 30 is not limited thereto. For example, the space part thermo-hygrometer 30 may be mounted on a support leg extending from the floor part 222 toward the ceiling part 221 to measure the temperature and humidity of the space part S at a position of a predetermined height from the floor surface F. The control unit of the space part thermo-hygrometer 30 controls the operation of the whole space part thermo-hygrometer 30 according to the instruction received from the humidity adjustment device 10.

The inner wall surface thermometer 40 is an equipment for measuring the temperature of the inner wall surface I of the manhole M. The inner wall surface thermometer 40 includes a temperature sensor, a storage unit, and a communication unit. The temperature sensor of the inner wall surface thermometer 40 detects the temperature of the inner wall surface I, and stores the detected temperature in the storage unit as the inner wall surface temperature information. The control unit transmits the inner wall surface temperature information to the humidity adjustment device 10 via the communication unit. The transmission of the inner wall surface temperature information may be always performed or may be performed in response to an instruction from the humidity adjustment device 10. In this embodiment, the inner wall surface thermometer 40 is mounted on the ceiling surface R of the manhole M. The temperature sensor detects the temperature of the ceiling surface R, and stores the detected temperature in the storage unit as the inner wall surface temperature information. The control unit of the inner wall surface thermometer 40 controls the operation of the whole inner wall surface thermometer 40 according to the instruction received from the humidity adjustment device 10.

FIG. 3 is the block diagram showing a configuration of the system 1 including the humidity adjustment device 10 according to the present embodiment. The control unit 11 of the humidity adjustment device 10 includes a critical humidity value calculation unit 111 and an operation determination unit 112. The control unit 11 acquires the humidity information indicating the humidity of the space part S of the manhole M and the space part temperature information indicating the temperature of the space part S from the space part thermo-hygrometer 30 via the communication unit 13. The control unit 11 further acquires the inner wall surface temperature information indicating the temperature of the inner wall surface I of the manhole M from the inner wall surface thermometer 40 via the communication unit 13. Specifically, the inner wall surface temperature information indicates the temperature of the ceiling surface R. The control unit 11 stores the acquired humidity information, space part temperature information and inner wall surface temperature information in the storage unit 12. The critical humidity value calculation unit 111 calculates a critical humidity value at which dew condensation does not occur in the manhole M on the basis of the space part temperature information, the inner wall surface temperature information, and the humidity information. The operation determination unit 112 determines the operation of the humidifier 20 so that the humidity is maintained in a range equal to or higher than a reference humidity value and lower than the critical humidity value. The control unit 11 transmits an instruction of the determined operation to the humidifier 20. The humidifier 20 receives the instruction and performs operation based on the instruction.

The “reference humidity value” is a humidity value for suppressing progress of the neutralization of concrete constituting the manhole M. As disclosed in the following Literature 2, it has become clear that the neutralization of concrete does not proceed substantially when the relative humidity is 90 percent or more. Therefore, in the present embodiment, the humidity is controlled so that the humidity of the space part S of the manhole M is equal to or higher than the reference humidity value. In this embodiment, the reference humidity value is set to 90 percent. The reference humidity value is not limited to this value, but may be freely set.

Literature 2: Hisatoshi Kasahara, and two others, “Progress behavior of neutralization in a reinforced concrete manhole for communication”, the 74th Annual Conference of the Japan Society of Civil Engineers, V-352, 2019

The “critical humidity value” is a value of the critical humidity at which dew condensation occurs on the inner wall surface I of the manhole M. In this embodiment, the value of the critical humidity at which dew condensation occurs on the ceiling surface R of the manhole M is specifically shown. As disclosed in the following Literature 3, when the inside of the manhole M is continuously humidified, the moisture in the air exceeds the saturated water vapor pressure and becomes a liquid. Since a large amount of liquid water in the manhole M interfere with the work in the manhole, and corrodes the reinforcing bars exposed from the reinforced concrete of the manhole M as dew condensation, it is preferable that the liquid water is not generated as much as possible.

Literature 3: Hisatoshi Kasahara, and two others, “influence of temperature on corrosion behavior of reinforcing bars due to dew condensation”, the 73th Annual Conference of the Japan Society of Civil Engineers, VI-235, 2018

Further, in the following Literature 4, it is disclosed that dew condensation occurs in many manholes M even if humidity is 100 percent or less due to the temperature of the ceiling part 221 becoming lower than that of the inside air. Therefore, in the present embodiment, the humidity is controlled so that the humidity of the space part S of the manhole M is less than the critical humidity value.

Literature 4: Norihiro Fujimoto, and two others, “Dew condensation occurrence mechanism in manhole for communication”, the 73th Annual Conference of the Japan Society of Civil Engineers, V-395, 2018

The control unit 11 of the humidity adjustment device 10 includes one or more processors. In the present embodiment, “processor” may be a general-purpose processor, or a dedicated processor specialized in specific processing, but not limited to these. The control unit 11 may be configured by dedicated hardware, or may be configured by a general-purpose processor or a processor specialized for specific processing. The control unit 11 executes processing related to the operation of the whole humidity adjustment device 10 while controlling each part of the humidity adjustment device 10. Also, the control unit 11 includes a critical humidity value calculation unit 111 and a operation determination unit 112. One or more programs used for controlling the operation of the control unit 11 are stored in the storage unit 12, and the programs are read by the control unit 11, so that the control unit 11 functions as the critical humidity value calculation unit 111 and the operation determination unit 112.

The control unit 11 controls the humidity of the space part S of the manhole M, as will be described in detail below. The control is performed by transmitting the instruction of the operation determined by the operation determination unit 112 to the humidifier 20 via the communication unit 13.

First, the control unit 11 acquires, from the space part thermo-hygrometer 30 and the inner wall surface thermometer 40, measured space part temperature information, humidity information, and inner wall surface temperature information by receiving them via the communication unit 13. The control unit 11 may acquire the space part temperature information, the humidity information, and the inner wall surface temperature information periodically or non-periodically.

Next, the operation determination unit 112 compares the humidity included in the humidity information with a reference humidity value, and determines whether the humidity is less than the reference humidity value.

The operation determination unit 112 determines the operation of the humidifier 20 so that the humidifier 20 performs a large amount of humidification when it is determined that the humidity is less than the reference humidity value. The operation determination unit 112 transmits an instruction of operation to the humidifier 20 via the communication unit 13. The “large amount of humidification” means to increase the amount of moisture discharged from the humidifier 20, to prolong the duration of the humidifying operation, or the like, and may be freely determined by the function of the humidifier 20.

The critical humidity value calculation unit 111 calculates the critical humidity value by referring to the space part temperature information and the inner wall surface temperature information. The critical humidity value calculation unit 111 first calculates a value of e based on the following Equation

$\left[\mathrm{Math}.1\right]$ $\begin{array}{cc}e=6.1078\times {10}^{\frac{7.5T}{T+237.3}}& \mathrm{Equation}\left(1\right)\end{array}$

In the Equation (1), T represents the temperature of the space part S of the manhole M included in the space part temperature information, and the unit is the Celsius temperature (□). The calculated value e is the value of the saturated water vapor steam pressure when the temperature of the space part S of the manhole M is T, and the unit is hPa. In this example, the value e is calculated by using the Equation (1), but other approximate equations may be used in addition to the Equation (1).

Next, the critical humidity value calculation unit 111 calculates the value of a on the basis of the following Equation (2).

$\left[\mathrm{Math}.2\right]$ $\begin{array}{cc}a=\frac{217\times e}{T+273.15}& \mathrm{Equation}\left(2\right)\end{array}$

The value a calculated by the Equation (2) is a value of a saturated water vapor amount when the temperature of the space part S of the manhole M is T, and a unit is m³/g.

Next, the critical humidity value calculation unit 111 calculates a value of e′ based on the following Equation (3).

$\left[\mathrm{Math}.3\right]$ $\begin{array}{cc}{e}^{\prime }=6.1078\times {10}^{\frac{7.5t}{t+237.3}}& \mathrm{Equation}\left(3\right)\end{array}$

In the Equation (3), t represents the temperature of the ceiling surface R of the manhole M included in the inner wall surface temperature information, and the unit is the Celsius temperature (□). The calculated value e′ is a value of the saturated water vapor pressure when the air in the manhole M hits the ceiling surface R and the temperature of the space part S reaches t, and the unit is hPa. In this example, the value e′ is calculated by using the Equation (3), but other approximate equations may be used in addition to the Equation (3).

Next, the critical humidity value calculation unit 111 calculates a value of a′ based on the following Equation (4).

$\left[\mathrm{Math}.4\right]$ $\begin{array}{cc}{a}^{\prime }=\frac{217\times e^{\prime }}{t+273.15}& \mathrm{Equation}\left(4\right)\end{array}$

The value a′ calculated by the Equation (4) is a value of a saturated water vapor amount when the air in the manhole M hits the ceiling surface R and the temperature of the space part S reaches t, and the unit is m³/g.

Next, the critical humidity value calculation unit 111 calculates the critical humidity value based on the following Equation (5).

$\left[\mathrm{Math}.5\right]$ $\begin{array}{cc}{a}^{\prime }\times \frac{100}{100}=a\times \frac{X}{100}& \mathrm{Equation}\left(5\right)\end{array}$

The Equation (5) indicates that the value a′ which is the value of the saturated water vapor amount (that is, the value of the water vapor amount at which the air coming into contact with the ceiling surface R of the manhole M and having a temperature T starts dew condensation) is equal to the water vapor amount at the humidity of X percent under an environment where the space part S of the manhole M is the temperature T. The value X is calculated as the critical humidity value.

The critical humidity value calculation unit 111 outputs information indicating the critical humidity value thus calculated to the operation determination unit 112.

The operation determination unit 112 determines whether or not the humidity included in the humidity information is less than the critical humidity value. When it is determined that the humidity is equal to or higher than the reference humidity value and less than the critical humidity value, the operation determination unit 112 determines the operation of the humidifier 20 so that the humidifier 20 performs a small amount of humidification. The operation determination unit 112 transmits an instruction of an operation so as to perform the small amount of humidification to the humidifier 20 via the communication unit 13. The “small amount of humidification” means that humidification is performed in a state where the amount of moisture discharged from the humidifier 20 is reduced, or the duration of the humidification operation is shortened, and may be determined by the function of the humidifier 20.

When the operation determination unit 112 determines that the humidity is equal to or higher than the reference humidity value and equal to or higher than the critical humidity value, the operation determination unit 112 determines that the humidifier 20 stops humidification, The operation of the humidifier 20 is determined. The operation determination unit 112 transmits an instruction of an operation to the humidifier 20 so as to stop humidification through the communication unit 13.

The storage unit 12 includes one or more memories and may include, for example, a semiconductor memory, magnetic memory, optical memory, and so on. Each of the memories included in the storage unit 12 may function, for example, as a main memory device, an auxiliary memory device, or a cache memory. The storage unit 12 stores various types of information used for the operation of the humidity adjustment device 10. The storage unit 12 stores the humidity information, the space part temperature information, and the inner wall surface temperature information acquired by the control unit 11. The storage unit 12 also stores information indicating the reference humidity value.

The communication unit 13 includes at least one communication interface. The communication interface is, for example, a LAN interface. The communication unit 13 receives information used for the operation of the humidity adjustment device 10, and transmits information obtained by the operation of the humidity adjustment device 10.

The input unit 14 includes at least one input interface. The input interface includes, for example, a physical key, a capacitive key, a pointing device, a touch screen provided integrally with a display, and a microphone. The input unit 14 receives an operation for inputting information used for the operation of the humidity adjustment device 10. The input unit 14 can directly receive a input such as information indicating the humidity information, the space part temperature information, the inner wall surface temperature information, the reference humidity value or information indicating the critical humidity value from a user.

The output unit 15 includes at least one output interface. The output interface is, for example, a display or a speaker. The display may be a liquid crystal display, an organic EL display, an inorganic EL display, or the like. The output unit 15 may be a touch panel, and in this case, the output unit 15 displays various types of information to the user and functions as the input unit 14 for receiving the input by the operation of the user.

<Program>

The humidity adjustment device 10 may be a computer capable of executing program instructions. The computer stores a program in which the processing content for realizing each function of the humidity adjustment device 10 in the storage unit of the computer, and loads and executes this program using a processor of the computer. A part of these processing contents may be realized by the hardware. Here, the computer may be any of a general purpose computer, dedicated computer, work station, PC (Personal Computer), electronic notepad, and so on. The program commands may be program codes, code segments, or the like for executing necessary tasks. The processor may be CPU (Central Processing Unit), GPU (Graphics Processing Unit), DSP (Digital Signal Processor), and so on.

This program may be recorded on a computer-readable recording medium. With the use of such a recording medium, the program can be installed into the computer. The recording medium in which the program is recorded may also be a non-transitory recording medium. The non-transitory recording medium may be, but is not particularly limited to, a recording medium such as a CD-ROM or a DVD-ROM. This program can also be made available by downloading it via a network.

Next, the operation of the system 1 including the humidity adjustment device 10 according to the present embodiment will be described with reference to FIGS. 4 and 5. Among the operations of the system 1, the operation of the humidity adjustment device 10 corresponds to the humidity adjustment method according to the present embodiment. FIG. 4 shows an example of the operation of the system 1. FIG. 5 is the flowchart showing the operation example of the control unit 11 of the humidity adjustment device 10. In this example, it is assumed that the humidifier 20 is under operation.

In a step S101, the control unit of the space part thermo-hygrometer 30 refers to the storage unit and transmits the space part temperature information and the humidity information to the humidity adjustment device 10 via the communication unit.

In a step S102, the control unit of the inner wall surface thermometer 40 refers to the storage unit and transmits the inner wall surface temperature information to the humidity adjustment device 10 via the communication unit.

In a step S103, the control unit 11 of the humidity adjustment device 10 receives, via the communication unit 13, the apace part temperature information, the humidity information, the inner wall surface temperature information from the space part thermo-hygrometer 30 and the inner wall surface thermometer 40 to acquire these information. The control unit 11 stores the acquired space part temperature information, humidity information, and inner wall surface temperature information in the storage unit 12.

In a step S104, the control unit 11 determines an operation to be instructed to the humidifier 20. FIG. 5 shows a specific processing flow of the determination of the operation in step S104.

In a step S201, the operation determination unit 112 reads the humidity information and the reference humidity value stored in the storage unit 12. The operation determination unit 112 compares the humidity included in the humidity information with the reference humidity value, and determines whether the humidity is less than the reference humidity value.

When the humidity is less than the reference humidity value, the operation determination unit 112 determines the operation of the humidifier 20 so that the humidifier 20 performs the large amount of humidification in a step S202, and the process for determining the operation is terminated. When the humidity is equal to or higher than the reference humidity value, processing for determining the operation proceeds to a step S203. In this example, the humidity is 95 percent and the reference humidity value is 90 percent. Since the humidity is equal to or higher than the reference humidity value, the processing for determining the operation proceeds to the step S203.

In the step S203, the critical humidity value calculation unit 111 refers to the space part temperature information, the inner wall surface temperature information, and the humidity information, and calculates the critical humidity value. The critical humidity value calculation unit 111 outputs the information indicating the calculated critical humidity value to the operation determination unit 112.

Next, in a step S204, the operation determination unit 112 compares the humidity with the critical humidity value and determines whether the humidity is less than the critical humidity value.

When the humidity is less than the critical humidity value, the operation determination unit 112 determines the operation of the humidifier 20 so that the humidifier 20 performs the small amount of humidification in a step S205, and the process for determining the operation is terminated. When the humidity is equal to or higher than the critical humidity value, the operation determination unit 112 determines the operation of the humidifier 20 so that the humidifier 20 stops humidification in a step S206. In this example, the humidity is 95 percent and the critical humidity value is 94 percent. Since the humidity is equal to or higher than the critical humidity value, the operation determination unit 112 determines the operation for stopping humidification in the step S206. Thus, the process of determining the operation to instruct the humidifier 20 is completed.

Then, returning to FIG. 4, in a step S105, the operation determination unit 112 transmits an instruction of the operation to the humidifier 20 via the communication unit 13 so as to execute the processing of the determined operation. The humidifier 20 is continued in this way. In this example, since the determined operation is the operation for stopping humidification, the control unit 11 transmits the instruction of the operation for stopping humidification to the humidifier 20 via the communication unit 13.

In a step S106, the control unit of the humidifier 20 receives the instruction of the operation from the humidity adjustment device 10 via the communication unit. In this example, the control unit of the humidifier 20 receives the instruction of the operation to stop humidification.

In a step S107, the humidifier 20 operates according to the instruction from the humidity adjustment device 10.

Specifically, the control unit of the humidifier 20 controls each unit of the humidifier 20 so as to operate according to the received instruction. In this embodiment, the heater, the fan, and the jetting port of the humidifier 20 are controlled so as to stop the humidification.

The humidity of the space part S of the manhole M is controlled by the steps S101 to S107.

As described above, the humidity adjustment device 10 according to the present embodiment includes the control unit 11 for acquiring the humidity information indicating the humidity of the space part S of the manhole M and controlling the humidity based on the humidity information.

According to this embodiment, the humidity in the manhole M made of the reinforced concrete can be controlled. The humidity of the space part S of the manhole M is controlled to be an appropriate value, so that the progress of neutralization of concrete constituting the manhole M can be prevented.

As described above, in the humidity adjustment device 10 according to the present embodiment, the control unit 11 further acquires the space part temperature information indicating the temperature of the space part S of the manhole M and the inner wall surface temperature information indicating the temperature of the inner wall surface I of the manhole M, calculates the critical humidity value at which dew condensation does not occur in the manhole M on the basis of the space part temperature information, the inner wall surface temperature information, and the humidity information, and controls the humidity on the basis of a result of comparing the critical humidity value with the humidity.

According to the present embodiment, the critical humidity value is calculated based on the temperature and humidity of the space part S of the manhole M and the temperature of the ceiling surface R included in the inner wall surface I. Since the humidity can be controlled by comparing the critical humidity value with the humidity, the occurrence of dew condensation due to excessive humidification in the manhole M can be prevented.

As described above, the humidity adjustment device 10 according to the present embodiment further includes the communication unit 13 for communicating with the humidifier 20 for humidifying the inside of the manhole M. The control unit 11 of the humidity adjustment device 10 determines the operation of the humidifier 20 so that the humidity is maintained in a range of the reference humidity value or more and less than the critical humidity value, and transmits the determined operation to the humidifier 20 via the communication unit 13.

According to the present embodiment, the humidity in the manhole M can be controlled more accurately by controlling the operation of the humidifier 20. By the operation of the humidifier 20, the humidity in the manhole M can be maintained at the humidity where the progress of neutralization of concrete is suppressed and dew condensation does not occur.

Second Embodiment

Below, the difference between the first embodiment and the present embodiment will be described.

FIG. 6 shows the outline of a system 2 according to the present embodiment. Referring to FIG. 6, the present embodiment is different from the first embodiment in that a water supply device 50 is provided in place of the humidifier 20. The humidity adjustment device 10, the water supply device 50, the space part thermo-hygrometer 30, and the inner wall surface thermometer 40 are connected to be communicable by wire or wireless. The communication method for transmitting and receiving information between the humidity adjustment device 10, the water supply device 50, the space part thermo-hygrometer 30, and the inner wall surface thermometer 40 is not particularly limited. The humidity adjustment device 10 may be installed outside the manhole M.

The water supply device 50 is a device for storing water in a liquid state so as to evaporate moisture in the space part S of the manhole M. The water supply device 50 includes a water supply container 51, an openable/closable cover 52, a water supply tank 53, a water supply passage 54, a water level sensor 55, a water supply pump, a motor, the control unit, the storage unit, and the communication unit. The control unit of the water supply device 50 controls the cover 52, the water supply pump, and the motor. In this embodiment, the water supply tank 53 is provided on the ground as shown in FIG. 6, but may be provided in the manhole M. In the water supply device 50, water is sucked up from the water supply tank 53 by the water supply pump and sent into the water supply passage 54. The water is discharged from the terminal end of the water supply passage 54 to the water supply container 51. The manhole M is humidified by evaporation of water from the water supply container 51. The water supply pump is driven by the motor, and the motor is controlled by the control unit of the water supply device 50. The water level sensor 55 detects the water level in the water supply container 51. The control unit of the water supply device 50 acquires the water level detected by the water level sensor 55, calculates the water amount in the water supply container 51, and stores it in the storage unit as water amount information. The water amount can be calculated on the basis of the volume of the water supply container 51 previously stored in the storage unit. The control unit of the water supply device 50 transmits the water amount information to the humidity adjustment device 10 via the communication unit. The water amount information may be transmitted at all times or may be transmitted in response to an instruction from the humidity adjustment device 10. By opening and closing the cover 52, the evaporation amount of moisture from the water supply device 50 is adjusted. The control unit of the water supply device 50 controls the operation of the whole water supply device 50 according to an instruction received from the control unit 11 of the humidity adjustment device 10.

FIG. 7 is the block diagram showing a configuration of the system 2 according to the present embodiment. In the humidity adjustment device 10 shown in FIG. 7, compared with the humidity adjustment device 10 of the first embodiment shown in FIG. 3, it is different from the first embodiment that the humidity adjustment device 10 communicates with the water supply device 50 instead of the humidifier 20, information is transmitted from the water supply device 50 to the humidity adjustment device 10, and the control unit 11 further includes a required water amount calculation unit 113.

As in the first embodiment, the control unit 11 of the humidity adjustment device 10 acquires the humidity information, the space part temperature information, and the inner wall surface temperature information. The control unit 11 further acquires the water amount information indicating the water amount in the water supply device 50 from the water supply device 50. The control unit 11 stores the acquired humidity information, space part temperature information, inner wall surface temperature information and water amount information in the storage unit 12. The critical humidity value calculation unit 111 calculates the critical humidity value in the same manner as in the first embodiment. The required water amount calculation unit 113 calculates the water amount required for the water supply device 50 based on the space part temperature information, the inner wall surface temperature information, the humidity information, and the information indicating the critical humidity value. The operation determination unit 112 determines the operation of the water supply device 50 so that the humidity is maintained in the range equal to or higher than the reference humidity value and less than the critical humidity value.

Specifically, the operation determination unit 112 determines the operation of the water supply device 50 on the basis of a result of comparing the required water amount with the water amount in the water supply device 50. The control unit 11 transmits an instruction of the determined operation to the water supply device 50. The water supply device 50 receives the instruction and performs the operation based on the instruction.

The “required water amount” is the water amount which is insufficient to set the humidity of the space part S of the manhole M to the critical humidity value. Specifically, the required water amount is calculated as the water vapor amount as shown below.

The control unit 11 controls the humidity of the space part S of the manhole M, as will be described in detail below. The control is performed by transmitting the instruction of the operation determined by the operation determination unit 112 to the water supply device 50 via the communication unit 13.

First, as in the first embodiment, the control unit 11 acquires the space part temperature information, the humidity information, and the inner wall surface temperature information. The control unit 11 further acquires the water amount information from the water supply device 50 by receiving the water amount information via the communication unit 13. The control unit 11 may acquire the space part temperature information, the humidity information, the inner wall surface temperature information, and the water amount information periodically or non-periodically.

Next, the operation determination unit 112 compares the humidity included in the humidity information with the reference humidity value, and determines whether the humidity is less than the reference humidity value, as in the first embodiment.

When it is determined that the humidity is less than the reference humidity value, the operation determination unit 112 determines the operation of the water supply device 50 so that the water supply device 50 takes in water. The operation determination unit 112 transmits the instruction of operation to the water supply device 50 via the communication unit 13. “Taking in water” means that the control unit of the water supply device 50 controls the motor or the cover 52 to add water into the water supply container 51 or prevent evaporation in the present embodiment, however it may be freely determined by the function of the water supply device 50.

The critical humidity value calculation unit 111 calculates the critical humidity value by the same method as in the first embodiment. The critical humidity value calculation unit 111 outputs the information indicating the calculated critical humidity value to the required water amount calculation unit 113.

The required water amount calculation unit 113 refers to the humidity information, the space part temperature information, the inner wall surface temperature information, and the information indicating the critical humidity value, and calculates the required water amount to be supplied to the water supply device 50. The required water amount calculation unit 113 calculates the value of A based on the following Equation (6).

$\left[\mathrm{Math}.6\right]$ $\begin{array}{cc}A=a\times V\times \frac{\mathrm{RH}}{100}& \mathrm{Equation}\left(6\right)\end{array}$

In the Equation (6), a represents the value of the saturated water vapor amount when the temperature of the space part S of the manhole M is T, and the calculation method is the same as that of the method shown in the first embodiment, so that the description thereof is omitted. In the Equation (6), V is the space volume in the manhole, and the unit is m³. RH is the humidity of the space part S, and the unit is percent. The value A to be calculate is the water vapor amount existing in the space part S of the manhole M, and the unit is g.

Next, the required water amount calculation unit 113 calculates the value of B based on the following Equation (7).

[Math. 7]

B=a′×V+A  Equation (7)

In the Equation (7), the term a′xV indicates the water vapor amount existing in the space part S when the humidity in the space part S of the manhole M is the critical humidity value. The value B to be calculated is the water vapor amount which is insufficient to set the humidity of the space part S of the manhole M to the critical humidity value, and the unit is g.

The required water amount calculation unit 113 outputs the water vapor amount calculated in this way to the operation determination unit 112 as the required water amount. Since the water which is the require water amount evaporates in the space part S, the humidity in the space part S approaches the critical humidity value. Thus, the humidity of the space part S can be maintained within the range of the reference humidity value or more and less than the critical humidity value by calculating and using the required water amount.

The operation determination unit 112 determines whether or not the water amount included in the water amount information is equal to or more than the required water amount.

The operation determination unit 112 determines the operation of the water supply device 50 so that the water supply device 50 stops taking in the water into the water supply container 51 when it is determined that the humidity is equal to or higher than the reference humidity value and the water amount is equal to or higher than the required water amount. The operation determination unit 112 transmits the instruction of operation to the water supply device 50 via the communication unit 13.

The operation determination unit 112 determines the operation of the water supply device 50 so that the water supply device 50 takes in the water into the water supply container 51 when it is determined that the humidity is equal to or higher than the reference humidity value and the water amount is less than the required water amount. The operation determination unit 112 transmits the instruction of operation to the water supply device 50 via the communication unit 13.

FIG. 8 shows a result of controlling the humidity of the space part S of the manhole M using the water supply device 50 according to the present embodiment. FIG. 8 is a graph showing a change in humidity in the space part S of the manhole M. The vertical axis represents the humidity of the space part S of the manhole M, and the horizontal axis represents the date of measuring the humidity. On May 20, 2019, the water in the water supply container 51 of the water supply device 50 installed in the manhole M is completely removed, and the humidity of the space part S in the manhole M is set to the humidity equal to the outside air. Thereafter, the water is supplied into the water supply container 51, and the iron cover 230 of the manhole M is closed. According to the graph of FIG. 8, it can be seen that the value of humidity in the manhole M changes up and down for about 10 days from May 20, 2019, where the water supply device 50 is disposed. This change is considered to show such behavior as the saturated water vapor amount changes with the change of the temperature in the manhole M. On the other hand, after May 30, 2019, which is the tenth day from May 20, 2019, the humidity of the space part S of the manhole M is maintained at a high humidity of about 100 percent. This is considered to be due to the evaporation action of water from the installed water supply device 50. As shown in FIG. 8, it can be seen that the humidity of the space part S of the manhole M can be effectively controlled by using the water supply device 50.

Next, the difference between the operation of the system 1 according to the first embodiment and the operation of the system 2 according to the present embodiment will be described. FIG. 9 shows an example of the operation sequence of the system 2. FIG. 10 is the flowchart showing an operation example of the control unit 11 of the humidity adjustment device 10 according to the present embodiment. In this example, it is assumed that the water is supplied to the water supply device 50.

The steps S301 to S302 in FIG. 8 are similar to the steps S101 to S102 in FIG. 4 according to the first embodiment and therefore the description will not omitted.

In a step S303, the control unit of the water supply device 50 refers to the storage unit, and transmits the water amount information indicating the water amount in the water supply device 50 to the humidity adjustment device 10 via the communication unit.

In a step S304, the control unit 11 of the humidity adjustment device 10 receives, via the communication unit 13, the space part temperature information, the humidity information, the inner wall surface temperature information from the space part thermo-hygrometer 30, the inner wall surface thermometer 40 and the water supply device 50 and acquires these information. The control unit 11 stores the acquired space part temperature information, the humidity information, the inner wall surface temperature information, and the water amount information in the storage unit 12.

In a step S305, the control unit 11 determines an operation to be instructed to the water supply device 50. FIG. 10 shows a specific processing flow of the determination of the operation in step S305.

In a step S401, the operation determination unit 112 reads the humidity information and the reference humidity value stored in the storage unit 12. The operation determination unit 112 compares the humidity included in the humidity information with the reference humidity value, and determines whether the humidity is less than the reference humidity value.

When the humidity is less than the reference humidity value, the operation determination unit 112 determines the operation of the water supply device 50 so that the water supply device 50 takes in the water in a step S402, and the processing for determining the operation is terminated. When the humidity is equal to or higher than the reference humidity value, processing for determining the operation proceeds to a step S403. In this example, the humidity is 95 percent and the reference humidity value is 90 percent. Since the humidity is equal to or higher than the reference humidity value, the processing for determining the operation proceeds to the step S403.

In the step S403, the critical humidity value calculation unit 111 refers to the space part temperature information, the inner wall surface temperature information, and the humidity information, and calculates the critical humidity value. The critical humidity value calculation unit 111 outputs the information indicating the calculated critical humidity value to the required water amount calculation unit 113.

In a step S404, the required water amount calculation unit 113 refers to the humidity information, the space part temperature information, the inner wall surface temperature information, and the information indicating the critical humidity value and calculates the required water amount to be supplied to the water supply device 50. The required water amount calculation unit 113 outputs the information indicating the calculated required water amount to the operation determination unit 112.

Next, in a step S405, the operation determination unit 112 compares the water amount with the required water amount, and determines whether the water amount is equal to or more than the required water amount.

When the water amount is equal to or more than the required water amount, the operation determination unit 112 determines the operation of the water supply device 50 so as to stop the water supply device 50 from taking in the water in a step S406, and the processing for determining the operation is terminated. When the water amount is less than the required water amount, the operation determination unit 112 determines the operation of the water supply device 50 so that the water supply device 50 takes in the water in the step S402. In this example, the water amount is less than the required water amount. Therefore, the operation determination unit 112 determines the operation of the water supply device 50 so that the water supply device 50 takes in the water in a step S402. Thus, the process for determining the operation to be instructed to the water supply device 50 is completed.

Then, returning to FIG. 9, in a step S306, the operation determination unit 112 transmits the instruction of the operation to the water supply device 50 so as to execute the processing of the determined operation via the communication unit 13. Thus, the water supply device 50 is controlled. In this example, since the determined operation is the operation for taking in the water, the control unit 11 transmits the instruction of the operation to the water supply device 50 so as to take in the water via the communication unit 13.

In a step S307, the control unit of the water supply device 50 receives the instruction of the operation from the humidity adjustment device 10 via the communication unit. In this example, the control unit of the water supply device 50 receives the instruction for taking in the water.

In a step S308, the water supply device 50 operates according to the instruction from the humidity adjustment device 10. Specifically, the control unit of the water supply device 50 controls each part of the water supply device 50 so as to operate according to the received instruction. In this embodiment, the motor of the water supply device 50 is controlled so as to take in the water.

The humidity of the space part S of the manhole M is controlled by the steps S301 to S308.

As described above, the humidity adjustment device 10 according to the present embodiment further includes the communication unit 13 for communicating with the water supply device 50 installed in the manhole M. The control unit 11 of the humidity adjustment device 10 determines the operation of the water supply device 50 so that the humidity is maintained in the range of the reference humidity value or more and less than the critical humidity value, and transmits the determined operation to the water supply device 50 via the communication unit 13.

According to the present embodiment, the humidity in the manhole M can be controlled more accurately by controlling the operation of the water supply device 50. By the operation of the water supply device 50, the humidity in the manhole M can be maintained at the humidity where the progress of neutralization of concrete is suppressed and dew condensation does not occur.

As described above, in the humidity adjustment device 10 according to the present embodiment, the control unit 11 acquires the water amount information indicating the water amount in the water supply device 50, calculates the required water amount of the water supply device 50 on the basis of the space part temperature information, the inner wall surface temperature information, the humidity information, and the information indicating the critical humidity value, determines the operation of the water supply device 50 on the basis of the result of comparing the required water amount with the water amount in the water supply device 50, and transmits the determined operation to the water supply device 50 via the communication unit 13.

According to the present embodiment, the required water amount of the water supply device 50 is calculated more accurately on the basis of the temperature and humidity of the space part S of the manhole M and the temperature of the ceiling surface R included in the inner wall surface I. The water supply device 50 can control the operation of taking water into the water supply container 51 on the basis of the calculated required water amount, so that the inside of the manhole M can be always maintained at appropriate humidity.

Although the present disclosure has been described based on drawings and examples, it should be noted that various modifications and corrections can be easily made by those skilled in the art based on the present disclosure. Therefore, it should be noted that such modifications and corrections fall within the scope of the present disclosure.

Modification Example 1

As a modification example of the present disclosure, the control unit 11 of the humidity adjustment device 10 may further include a sealing property determination unit 114.

As will be described in detail below, the sealing property determination unit 114 judges whether or not there is sealing property in the manhole M.

The sealing property determination unit 114 first reads out the humidity information stored in the storage unit 12 and the hygroscopic property information indicating the hygroscopic property of the concrete constituting the manhole M stored in advance in the storage unit 12. The “hygroscopic property information” includes a humidity drop amount reference value, a humidity change reference tendency, and a duration reference value of humidity drop. Here, the hygroscopic property information is set according to a humidity control property of the concrete constituting the manhole M. The humidity control property of the concrete refers to the performance of moisture absorption when concrete is dried as compared with the surrounding environment and moisture desorption when the concrete is wet as disclosed in the following Literatures 5 and 6.

Literature 5: Hiroyuki Tanaka, and other, “Difference in void structure and humidity control performance of cement-based solidified material due to difference in aggregate”, the 67th Annual Conference of the Japan Society of Civil Engineers, V-448, 2012

Literature 6: Katsuhiko Goto, and other, “Structure and humidity controlling performance of zeolite-cement hardened body”, Journal of the Ceramic Society of Japan, Vol. 113, No. 1, PP. 736-742, 2005

The “humidity drop amount reference value” is a value indicating a reference of the humidity drop amount in the manhole M. The drop amount in humidity in the closed manhole M in a fixed time is measured in advance, and the drop amount is used as the humidity drop amount reference value. It has been found that the rate of moisture absorption by the concrete is low, and the humidity drop amount in the manhole M constituted of the concrete is relatively small. Therefore, the humidity drop amount in the closed manhole M is measured in advance and the measured value can be used as a reference value.

The “humidity change reference tendency” indicates a tendency of a change with time in humidity in the manhole M. In the closed manhole M, the humidity change tendency in a certain time is measured in advance, and the measured tendency is used as the humidity change reference tendency. The size and shape of the manhole are determined by the standard, and in the manhole of the same size and shape, the humidity change tendency due to the moisture absorption function of the concrete is similar. Therefore, the humidity change tendency in the manhole having the same size and shape is grasped beforehand, and this tendency can be used as a reference for determining the other manhole.

The “duration reference value” is a value indicating a duration of the humidity drop in the manhole M. In the closed manhole M, the time for continuing the humidity drop is measured in advance, and the measured time is used as the duration reference value. The humidity drop due to moisture absorption of the concrete stops after the lapse of a fixed time as long as the inside of the manhole is maintained in a high humidity environment, but the humidity drop does not stop or restarts even if it stops once in the manhole having a low sealing. Therefore, the duration of the humidity drop is measured in advance and the measured duration can be used as a reference value.

The sealing property determination unit 114 determines whether or not there is the sealing property of the manhole M by comparing humidity included in the humidity information with the humidity change reference tendency, the humidity drop amount reference value, or the duration reference value. For example, the sealing property determination unit 114 determines that there is the sealing property of the manhole M when the humidity change tendency matches the humidity change reference tendency. For example, the sealing property determination unit 114 determines that there is the sealing property of the manhole M when the humidity drop amount is less than the humidity drop amount reference value. For example, the sealing property determination unit 114 determines that there is the sealing property of the manhole M when the duration of the humidity drop is less than the duration reference value. The sealing property determination unit 114 may determine the sealing property by using any one of the humidity change reference tendency, the humidity drop amount reference value, and the duration reference value, or may determine by using a plurality of reference values.

The control unit 11 notifies a user of the result determined by the sealing property determination unit 114 via the output unit 15. Thus, the user can grasp the sealing property of the manhole M. The control unit 11 may transmit the determined result to a terminal device of the user who inspects the manhole M via the communication unit 13.

In the present modification, the operation determination unit 112 may determine the operation performed by the humidifier 20 or the water supply device 50 in accordance with the result determined by the sealing property determination unit 114. For example, when the sealing property determination unit 114 determines that there is no sealing property of the manhole M, the operation determination unit 112 may determine the operation of the humidifier 20 so that the humidifier 20 performs a large amount of humidification. For example, when the sealing property determination unit 114 determines that there is no sealing property of the manhole M, the operation determination unit 112 may determine the operation of the water supply device 50 so that the water supply device 50 takes in the water. The operation instruction determined by the operation determination unit 112 is transmitted to the humidifier 20 or the water supply device 50 via the communication unit 13, and the humidifier 20 or the water supply device 50 may operate according to the instruction.

As described above, in the humidity adjustment device 10 according to the present modification, the control unit 11 determines whether or not there is the sealing property of the manhole M on the basis of the humidity information.

According to this modification, the presence or absence of the sealing property of the manhole M can be easily grasped. By grasping the sealing property, humidity in the manhole M can be properly maintained, and it can be found at an early stage that the iron cover 230 of the manhole M is detached, or that a damaged part exists in the manhole M, etc. Thus, the occurrence of an accident in the manhole M can be prevented.

As described above, the control unit 11 of the humidity adjustment device 10 according to the present modification determines the sealing property based on the humidity control property of the concrete constituting the manhole M.

According to this modification, when the humidity in the manhole M is dropped, it is easy to determine whether the drop is caused by moisture absorption of the concrete constituting the manhole M or due to no sealing property. Thus, the presence or absence of the sealing property of the manhole M can be grasped more accurately.

Modification Example 2

As a modification example of the present disclosure, the humidity adjustment device 10 may further include a dehumidification device. In this modification, the humidity adjustment device 10 controls the operation of the dehumidifier in addition to the operation of the humidifier 20 or the water supply device 50.

According to this modification, the humidity in the manhole M can be adjusted more quickly and accurately by using the dehumidifying function of the dehumidifier. For example, when the humidity outside the manhole M is high, or when rainwater enters the manhole M, the humidity of the space part S is quickly reduced by the dehumidifier, and the humidity can be prevented from reaching the critical humidity value.

Modification Example 3

As a modification example of the present disclosure, the control unit 11 of the humidity adjustment device 10 may estimate the temperature of the ceiling surface R of the manhole M from the temperature included in the space part temperature information instead of acquiring the temperature from the inner wall surface thermometer 40. For example, the control unit 11 may analyze the temperature included in the space part temperature information and the depth of the manhole M previously stored in the storage unit 12 as parameters to estimate the temperature of the ceiling surface R. The details of the method for measuring the temperature of the ceiling surface R by analyzing the temperature of the space part S of the manhole M and the depth of the manhole M as parameters are disclosed in, for example, the following Literature 7, and therefore the description thereof will be omitted.

Literature 7: Kazuaki Watanabe, and four others, “Estimation hydrothermal condition concrete in manhole for information network by integrated heat transfer analysis of soil and structure”, Journal of Japan Society of civil engineers, Ser.E2 (Materials and Concrete Structures), Vol. 76, No. 2, PP. 65-77, 2020

According to this modification, since the control unit 11 can acquire the temperature of the ceiling surface R without installing the inner wall surface thermometer 40 in the manhole M, the humidity in the manhole M can be controlled with a simpler configuration.

Modification Example 4

As a modification example of the present disclosure, the control unit 11 of the humidity adjustment device 10 may acquire the temperature of the space part S of the manhole M from the optical fiber using a sensing technique instead of acquiring the temperature of the space part S from the space part thermo-hygrometer 30. The optical fiber is included in a communication cable installed in the manhole M. The details of the sensing technique of the optical fiber are disclosed in, for example, the following Literature 8, and therefore the description thereof is omitted.

Literature 8: Tokuo Yamaguchi, and other, “Distributed optical fiber temperature sensing”, OKI technical review, No. 203, Vol. 84, No. 2, 2017

According to this modification, the control unit 11 can acquire the temperature of the space part S without using the space part thermo-hygrometer 30 in the manhole M, so that the humidity in the manhole M can be controlled with a simpler configuration.

Modification Example 5

As a modification example of the present disclosure, the humidity adjustment device 10 may include a moisture absorption/desorption material having moisture absorption/desorption properties instead of the humidifier 20 and the water supply device 50, or in addition to the humidifier 20 and the water supply device 50. The moisture absorption/desorption material may be installed along the whole inner wall surface I of the manhole M, for example.

According to this modification, the humidity in the manhole M can be controlled by a simpler configuration.

REFERENCE SIGNS LIST

• • 1,2 System
  • 10 Humidity adjustment device
  • 11 Control unit
  • 12 Storage unit
  • 13 Communication unit
  • 14 Input unit
  • 15 Output unit
  • 111 Critical humidity value calculation unit
  • 112 Operation determination unit
  • 113 Required water amount calculation unit
  • 114 Sealing property determination unit
  • 20 Humidifier
  • 30 Space part thermo-hygrometer
  • 40 Inner wall surface thermometer
  • 50 Water supply device
  • 51 Water supply container
  • 52 Cover
  • 53 Water supply tank
  • 54 Water supply passage
  • 55 Water level sensor
  • 210 Neck part
  • 220 Frame part
  • 230 Iron cover
  • 221 Ceiling part
  • 222 Floor part
  • 223 Side wall part

Claims

1. A humidity adjustment device, the device comprising a processor configured to execute a method comprising

acquiring humidity information indicating humidity of a space part of a manhole; and

adjusting, based on the humidity information, the humidity of the space part of the manhole.

2. The humidity adjustment device according to claim 1, the processor further configured to execute a method comprising:

acquiring space part temperature information and inner wall surface temperature information, wherein the space part temperature information includes a temperature of the space part of the manhole, and wherein the inner wall surface temperature information includes a temperature of an inner wall surface of the manhole;

calculating a critical humidity value at which dew condensation does not occur in the manhole based on one or more of: the space part temperature information, the inner wall surface temperature information, and the humidity information; and

adjusting the humidity of the space part of the manhole based on a result of comparing the critical humidity value with the humidity.

3. The humidity adjustment device according to claim 2, the processor further configured to execute a method comprising:

determining an operation for maintaining the humidity within a range equal to or greater than a reference humidity value and less than the critical humidity value; and

transmitting data for humidifying the inside of the manhole.

4. The humidity adjustment device according to claim 2, the processor further comprises a method comprising:

determining an operation for supplying water in the manhole to maintain the humidity within a range equal to or greater than a reference humidity value and less than a critical humidity value; and

transmitting data for maintaining the humidity according to supplying water in the manhole.

5. The humidity adjustment device according to claim 4, wherein

the acquiring the space part information further comprises: acquiring acquires water amount information indicating a water amount associated with supplying water in the manhole, calculating a needed water amount based on one or more of: the space part temperature information, the inner wall surface temperature information, the humidity information, or the information indicating the critical humidity value, determining the operation of supplying the water based on a result of comparing the needed water amount with the water amount, and causing transmission of the determined operation to supply the water.

6. The humidity adjustment device according to claim 1, the processor further configured to execute a method comprising:

determining whether or not there is sealing property in the manhole on the basis of the humidity information.

7. The humidity adjustment device according to claim 6, the processor further configured to execute a method comprising:

determining the sealing property based on humidity control property of concrete constituting the manhole.

8. A method for adjusting humidity inside a manhole, the method comprising:

acquiring humidity information indicating humidity of a space part of the manhole; and

controlling the humidity of the space part of the manhole on the basis of the humidity information.

9. The humidity adjustment device according to claim 2, the processor further configured to execute a method comprising:

determining whether or not there is sealing property in the manhole on the basis of the humidity information.

10. The humidity adjustment device according to claim 3, the processor further configured to execute a method comprising:

determining whether or not there is sealing property in the manhole on the basis of the humidity information.

11. The humidity adjustment device according to claim 4, the processor further configured to execute a method comprising:

determining whether or not there is sealing property in the manhole on the basis of the humidity information.

12. The humidity adjustment device according to claim 5, the processor further configured to execute a method comprising:

determining whether or not there is sealing property in the manhole on the basis of the humidity information.

13. The method according to claim 8, further comprising:

acquiring space part temperature information and inner wall surface temperature information, wherein the space part temperature information includes a temperature of the space part of the manhole, and wherein the inner wall surface temperature information includes a temperature of an inner wall surface of the manhole;

calculating a critical humidity value at which dew condensation does not occur in the manhole based on one or more of: the space part temperature information, the inner wall surface temperature information, and the humidity information; and

adjusting the humidity of the space part of the manhole based on a result of comparing the critical humidity value with the humidity.

14. The method according to claim 13, further comprising:

determining an operation for maintaining the humidity within a range equal to or greater than a reference humidity value and less than the critical humidity value; and

transmitting data for humidifying the inside of the manhole.

15. The method according to claim 13, further comprising:

determining an operation for supplying water in the manhole to maintain the humidity within a range equal to or greater than a reference humidity value and less than a critical humidity value; and

transmitting data for maintaining the humidity according to supplying water in the manhole.

16. The method according to claim 15, wherein the acquiring the space part information further comprises:

acquiring acquires water amount information indicating a water amount associated with supplying water in the manhole,

calculating a needed water amount based on one or more of: the space part temperature information, the inner wall surface temperature information, the humidity information, or the information indicating the critical humidity value,

determining the operation of supplying the water based on a result of comparing the needed water amount with the water amount, and

causing transmission of the determined operation to supply the water.

17. The method according to claim 8, further comprising:

determining whether or not there is sealing property in the manhole on the basis of the humidity information.

18. A system for adjusting humidity, the system comprising a processor configured to execute a method comprising:

acquiring humidity information indicating humidity of a space part of the manhole; and

controlling the humidity of the space part of the manhole on the basis of the humidity information.

19. The system according to claim 18, the processor further comprising a method comprising:

acquiring space part temperature information and inner wall surface temperature information, wherein the space part temperature information includes a temperature of the space part of the manhole, and wherein the inner wall surface temperature information includes a temperature of an inner wall surface of the manhole;

calculating a critical humidity value at which dew condensation does not occur in the manhole based on one or more of: the space part temperature information, the inner wall surface temperature information, and the humidity information; and

adjusting the humidity of the space part of the manhole based on a result of comparing the critical humidity value with the humidity.

20. The system according to claim 19, the processor further comprising a method comprising:

determining an operation for maintaining the humidity within a range equal to or greater than a reference humidity value and less than the critical humidity value; and

transmitting data for humidifying the inside of the manhole.