Abstract: A loosening detection structure used to detect loosening of a bolt includes a material that is disposed between a fixing subject steel plate and a head portion of a metal bolt for fixing the steel plate and either attached to a seating surface of the head portion of the bolt or attached to a washer disposed between the steel plate and the head portion of the bolt, and that has electrical characteristics that vary in response to variation in a force for fastening the bolt to the steel plate.

Abstract: A corrosion amount estimation apparatus that estimates the corrosion amount of a metal material buried in the ground, the apparatus including: a soil adjustment unit that dries the target soil; a water permeability measurement unit that measures the water permeability of the soil after supplying water to the dried soil; and a corrosion estimation unit that estimates the corrosion amount of the metal material when buried in the soil using the water permeability.

Abstract: An impact level calculation device includes a primary impact direction setting unit, which sets a primary impact direction based on the direction in which a branch line of a utility pole with a branch line is strung, an impact range setting unit, which sets, based on the primary impact direction, an impact range representing the range of the damage caused when the utility pole tilts or collapses, and an impact level calculation unit, which extracts targets that fall within the impact range and calculates and sums the impact levels on each of the targets, and the impact level calculation device calculates an impact level representing the level of damage caused to surroundings of the utility pole with a branch line when the utility pole tilts or collapses.

Abstract: A looseness detection structure configured to detect looseness between a bolt and a nut that fix two components including a conductive film configured to be attached on a surface of the component, the surface of the component including a hole into which the bolt is inserted, the conductive film being attached such that the conductive film is not directly conductive to the component, a part of the conductive film having a dimension relating to a half wavelength of a high-frequency signal propagating inside the components, and a non-conductive film between a surface of the component and the conductive film in a case where surfaces of the components are conductors, and a second conductive film on a surface of the component in a case where the surfaces of the components are insulators, the second conductive film being opposite to the conductive film.

Abstract: A mobile body that is human-powered includes three all-directional wheels with axles thereof displaced from each other by 120 degrees, a connection portion that connects two front wheels, a brake attached to a rear wheel, and a disconnection portion that disconnects the two front wheels from each other. The connection portion connects the two front wheels such that the two front wheels rotate in directions opposite to each other. The connection portion connects the front wheels with the rear wheel such that the two front wheels rotate in the same direction, while the front wheels rotate in a direction opposite to a rotational direction of the rear wheel.

Abstract: A crack detection device includes: a sensor unit that has a three-layer structure of conductor-insulator-conductor and is attached to a structure; a frequency characteristics acquisition unit that sweeps a predetermined frequency range to acquire a plurality of frequencies at which the impedance of the sensor unit is maximum or minimum; a crack presence/absence determination unit that determines the presence or absence of a crack based on a nonuniformity of the plurality of frequencies; a crack position table in which a relationship between crack positions and frequency shift directions is recorded; and a crack position detection unit that, when the crack presence/absence determination unit determines that there is a crack, takes a difference between two frequencies acquired by the frequency characteristics acquisition unit to determine a sign, and then refers to the crack position table in accordance with the sign to detect a crack position.

Abstract: An estimation device has: determination unit for acquiring a characteristic color of reinforced concrete in a dry state from an initial image obtained by capturing an image of a concrete surface of the concrete, analyzing a first image of the concrete surface that is captured after spraying water onto the reinforced concrete, and determining a portion having a predetermined color difference from the characteristic color as a crack; and an estimation unit for impregnating the crack with water, analyzing a second image of the concrete surface that is captured after the concrete surface is dried, and estimating whether or not the inside of the crack is carbonated, using a color around the crack.

Abstract: An underground investigation device includes a transmission unit configured to transmit a pulse wave, a reception unit configured to receive a reflected signal, a memory configured to store time waveform data of the reflected signal, a storage device having a larger capacity than a capacity of the memory, a control unit configured to transfer the time waveform data from the memory to the storage device, and a signal processing unit configured to generate underground investigation data based on the time waveform data in the storage device. The reception unit sets a measurement span for sampling the reflected signal by using, as a trigger, transmission of the pulse wave or reception of a reflected signal resulting from reflection by a ground surface, samples the reflected signal in the measurement span, and stores the time waveform data in the memory. The control unit transfers the time waveform data from the memory to the storage device after the measurement span.

Abstract: A composition ratio calculating unit configured to calculate a first composition ratio that is a ratio of substance quantities of rust collected from a broken surface of internal steel of an updated old concrete structure and a second composition ratio that is a ratio of substance quantities of rust collected from a surface different from the broken surface, a composition ratio calculating unit configured to calculate a first corrosion time corresponding to the first composition ratio and a second corrosion time corresponding to the second composition ratio from characteristics representing a relation between a first corrosion time and the first composition ratio and a relation between a second corrosion time and the second composition ratio, respectively, and a breaking time calculating unit configured to calculate a time for the internal steel to break by subtracting the first corrosion time from the second corrosion time are included.

Abstract: A transducer includes a conductive sheet installed on a sheath of a cable, an insulative sheet installed on the conductive sheet, holes being formed in predetermined positions of the insulative sheet, and a conductive sheet installed on the insulative sheet, holes being formed in predetermined positions of the conductive sheet. The transducer has structure in which, when the cable is tightened by the screw from the top of the conductive sheet and fixed, the distal end of the screw comes into contact with the conductive sheet passing through the holes formed in the insulative sheet and the conductive sheet, and the conductive sheet and the conductive sheet are electrically connected.

Abstract: Provided is a method for evaluating a hydrogen embrittlement fracture risk of an iron reinforcing bar that is performed by a hydrogen embrittlement fracture risk evaluation apparatus, the method including: a fracture probability curved surface generation step of obtaining a fracture probability curved surface representing a probability of the iron reinforcing bar fracturing by performing regression analysis on results obtained by repeatedly carrying out a hydrogen embrittlement test while changing an amount of hydrogen absorbed in the iron reinforcing bar provided in a concrete structure and a tensile stress applied to the iron reinforcing bar and using the amount of hydrogen and the tensile stress as variables; a lower limit stress acquisition step of acquiring, from the fracture probability curved surface, a lower limit stress property representing a relationship between a lower limit stress that is a lower limit of the tensile stress at which no fracture occurs in the iron reinforcing bar at a predetermine

Abstract: A loosening detection device according to the present embodiment includes multiple washers having holes that allow bolts to pass therethrough, and including metals insulated from each other, a transmission line that electrically connects between the metals and between the metals of the washers, and a transmission line that includes a terminal pair at one end thereof, and that has the other end electrically connected to the metals of the washer. A resonance frequency is measured from the terminal pair to detect loosening of the bolts on the basis of a change in the resonance frequency.

Abstract: A tradeoff between a model accuracy and an amount of calculation in numerical analysis that simulates an underground structure pull-out test is solved. A structure model generation unit generates a structure model obtained by modeling an underground structure. A particle generation unit sets the maximum diameter of SPH particles that does not cause indication of a time history result underestimating a pull-out resistance force that is a result of the analysis, and generates the SPH particles obtained by modeling soil that is a supporter of the underground structure. An operation unit applies coupled analysis to the structure model and the SPH particles by a finite element method and an SPH method.

Abstract: A looseness detection structure includes: a structure (transducer) T which is formed on a surface of a cable; a screw which tightens and fixes the cable in contact with the structure T; and a terminal (detection unit) which transmits a transmission signal to the structure T, receives a reception signal returning after propagating through the structure T, and detects the loosening of the screw based on a change in the reception signal.

Abstract: An object is to support evaluation of corrosion of metal embedded in the ground such that the corrosion can be evaluated with high accuracy even if any type of soil is used.

Abstract: In a prediction formula derivation apparatus, a calculation unit derives a prediction formula for predicting progression of corrosion of a metal based on a variation index resulting from a cyclical external factor that causes a predetermined environment (e.g., in air, underwater, underground, etc.) to vary, and a unit index obtained based on a value corresponding to the corrosion amount of the metal in the environment resulting from the external factor for one cycle.

Abstract: A ground penetrating radar device of the present embodiment is a manually operable device, in which encoders are attached to axles of three wheels that are mutually displaced by 120 degrees. A control unit calculates, from rotation amounts measured by the encoders, the moving direction, moving distance, moving speed vector, and turning vector of the ground penetrating radar device. A measurement unit searches for an underground buried object with radio wave. A storage unit stores a two-dimensional measurement data set, in which positional information and moving direction of the ground penetrating radar device calculated by the control unit is associated with measurement data obtained by a radar measurement unit. A display unit displays a facility map indicating the position where an underground structure is present, which is stored in a database, together with the measurement data while superimposing the facility map and the measurement data one on the other.

Abstract: A learning device includes: a storage device configured to store input data that contains a plurality of data sets relating to a first event and a plurality of data sets relating to a second event, the number of the data sets relating to the second event being smaller than the number of the data sets relating to the first event; a copula function estimation unit configured to estimate a copula function and a parameter for use in the copula function, based on the data sets relating to the second event; a simulation unit configured to generate a data set relating to the second event through simulation using the copula function and the parameter; and a learning unit configured to learn an estimation model for distinguishing the first event and the second event from each other, with reference to the input data, and the data set relating to the second event generated by the simulation unit.

Abstract: A corrosion prediction device that predicts corrosion indicating the degree to which a metal will corrode in an environment, the device including a storage unit which stores a soil sample that simulates the environment and an electrode unit and has a function of repeatedly performing water supply and drainage with respect to the soil sample; the electrode unit including at least one type of metal pieces; a measurement unit that measures, based on change in water content in the environment in one cycle, a corrosion rate of the metal pieces or a value proportional to the corrosion rate of the metal pieces during the change; a calculation unit that integrates the corrosion rate or a value proportional to the corrosion rate over time and calculates an amount of corrosion or a value proportional to the amount of corrosion; and a prediction unit that determines a constant value of K of the power law and a constant value of n of the power law using a difference between the amounts of corrosion or the values proporti

Abstract: Provided is an anticorrosion device that does not require the installation of electrical equipment and has no concern about loss of anticorrosion effect due to deterioration of the anode. An anticorrosion device that prevents corrosion of a metal material in a structure, including a thermoelectric power generation unit 10 configured to generate an electromotive force due to a temperature gradient, an anode unit 20 that is responsible for an anode reaction corresponding to the electromotive force, and a cathode unit 30 that is responsible for a cathode reaction corresponding to the electromotive force, in which the cathode unit 30 is a metal material (target metal) in the structure.