ASSEMBLED UTILITY POLE, POLE BUILDING METHOD AND REBUILDING METHOD
An object of the present invention is to provide a utility pole and a method for constructing the utility pole, which can simplify and improve efficiency of work at the time of new construction and replacement and can shorten a work period. The anchor has a larger diameter than a body of a utility pole on the ground and has higher ground support force. Thus, the hole for building the assembly type utility pole on the ground can be made shallower than the hole for building the utility pole in related art on the ground. The depth of the hole is shallow, so that it is possible to reduce a period for digging, reduce a probability of hitting a buried object, and reduce work for confirming a buried object. In addition, the assembly type utility pole includes a plurality of parts, and thus, only a degraded portion needs to be replaced, so that it is possible to shorten replacement work. Further, the assembly type utility pole includes a plurality of parts, and thus, each part is smaller than that of the utility pole in related art, so that it is possible to simplify work.
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The present disclosure relates to an assembly type utility pole, a method for constructing the same, and a method for replacing the same.
BACKGROUND ARTExcavation step by manpower: in order to prevent an accident of damaging a buried object, excavation by hand is performed for a section where there is a high possibility that another company's buried object exists.
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- (1) A small portion of a surface layer is dug with a scoop, or the like (a search hole is dug).
- (2) A probe is manually inserted into the dug hole, and it is confirmed whether there is no buried object in an excavation direction (determined by whether or not something comes into contact with a tip of the probe).
- (3) The hole is further dug with the scoop up to a range searched by the probe.
- (4) Steps (2) and (3) described above are repeated until an excavation depth becomes about 1.5 m.
Excavation Step by Heavy Equipment:
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- (5) In a case where there is no buried object, a hole for building with a target depth from the excavation depth of 1.5 m or more of the search hole is mechanically excavated by an earth auger of a pole construction track.
Lifting and Building Step:
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- (6) The utility pole is lifted with a crane and is built in the excavated hole for building. In this event, it is dangerous if the utility pole swings when being lifted, so that it is necessary to prevent swinging of the utility pole with a rope, or the like.
Vertical Adjustment and Backfilling Step:
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- (7) The utility pole is held by the crane and adjusted so as to be perpendicular to the ground.
- (8) After a vertical position of the utility pole is confirmed, soil is returned to the hole for building, and backfilling is performed.
- (9) After backfilling is completed, the ground is compacted by a compactor, or the like, and compaction is performed.
As illustrated in
- Non Patent Literature 1: Dainichi Concrete Industry Co., Ltd., technical data (http://www.dainichi-x.co.jp/wp/wp-content/uploads/2017/11/technical_data.pdf), retrieved on Feb. 25, 2021.
[First Problem]
In the ground, a large amount of power cables, water pipes, gas pipes, and the like, which are social infrastructure facilities, are buried. When a utility pole is built, a depth of 1.5 m to 3.0 m is dug, and thus, the utility pole may hit a buried object such as a power cable. This is not acceptable, because the buried object would be destroyed by being hit, which may affect users over a wide range. It is therefore very important to confirm that there is no buried object. As a method for confirming a buried object, a primitive method in which a hole is slightly dug and a worker performs confirmation using a probe, or the like, is repeatedly performed.
In other words, a construction work of a utility pole requires a large number of man-hours for a step of confirming a buried object, which is a first problem that it is difficult to reduce the number of man-hours.
[Second Problem]
After installation of the utility pole is completed, a material is deteriorated due to aging. Loads, generated by a cable hung on the utility pole, a transformer installed on the utility pole, or the like, is ideally balanced. However, in reality, a load caused by wind pressure, or the like, is unevenly generated. Thus, in a state where the utility pole is deteriorated, strength may decrease and the utility pole may be broken. For this reason, it is necessary to replace the degraded utility pole with a new one.
A general replacement work method is illustrated in
Excavation Step:
-
- (1) A hole for building of a new utility pole is excavated in the vicinity of the utility pole to be replaced. The excavation step is the same as the excavation step by manpower and the excavation step by the heavy equipment described in
FIG. 3 .
- (1) A hole for building of a new utility pole is excavated in the vicinity of the utility pole to be replaced. The excavation step is the same as the excavation step by manpower and the excavation step by the heavy equipment described in
New Pole Building, Vertical Adjustment, and Backfilling Step:
-
- (2) A new utility pole is built in the vicinity of the utility pole to be replaced therewith and the hole for building is backfilled, in accordance with procedure similar to that in the lifting and building step and the vertical adjustment and backfilling step in
FIG. 3 .
- (2) A new utility pole is built in the vicinity of the utility pole to be replaced therewith and the hole for building is backfilled, in accordance with procedure similar to that in the lifting and building step and the vertical adjustment and backfilling step in
Cable Relocating Step:
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- (3) Existing cables are relocated to the new utility pole using a high-place work vehicle, or the like.
Removal Step of Pole to be Replaced:
-
- (4) The ground of the utility pole to be replaced is excavated, the pole is lifted with a crane, or the like, and the pole is removed. In this event, it is dangerous if the utility pole swings when being lifted, and thus, it is necessary to prevent swinging with a rope, or the like.
- (5) Soil is put into the hole after removal to perform backfilling.
- (6) After backfilling is completed, the ground is compacted by a compactor, or the like, and compaction is performed.
- (7) In a case where a landowner, or the like, requests replacement to the same position as the utility pole to be replaced, after completion of work (5), the steps of work (1) to (6) are performed again to perform replacement to the original position.
As illustrated in
In other words, the replacement work of the utility pole also requires many man-hours, which is a second problem that it is difficult to reduce the man-hours.
[Third Problem]
The above-described construction work and replacement work of the utility pole require not only man-hours but also many workers. If necessary workers cannot be secured, it is difficult to perform the construction work and the replacement work as described above. In other words, there is a third problem that it is difficult to perform the construction work and the replacement work of the utility pole with a small number of workers.
Thus, in order to solve the above problems, an object of the present invention is to provide an assembly type utility pole, a method for constructing the assembly type utility pole, and a method for replacing the assembly type utility pole, which can simplify and improve efficiency of work at the time of new installation and replacement and can shorten a work period.
Solution to ProblemIn order to achieve the above object, an assembly type utility pole according to the present invention is a utility pole including a plurality of members stacked in a height direction and includes a mechanism for excavating the ground in a lowermost member to be buried in the ground.
Specifically, an assembly type utility pole according to the present invention includes a pole, and an anchor that is a substantially cylindrical object having a diameter larger than a diameter of the pole and has a hole into which one end of the pole is fitted, and
-
- when one end of the pole is fitted into the hole of the anchor, the pole and the anchor becomes coaxial.
A method for constructing a utility pole according to the present invention includes: burying an anchor of a substantially cylindrical object having a diameter larger than a diameter of a pole in a ground such that one end of a bottom surface of the substantially cylindrical object substantially matches a ground surface; and fitting one end of the pole into a hole of the anchor in which the pole and the anchor are coaxial.
The anchor has a larger diameter than a body of a utility pole on the ground and has higher ground support force. Thus, the hole for building the assembly type utility pole on the ground can be made shallower than the hole for building the utility pole in related art on the ground. The depth of the hole is shallow, so that it is possible to reduce a period for digging, reduce a probability of hitting a buried object, and reduce work for confirming a buried object.
In addition, the assembly type utility pole includes a plurality of parts, and thus, only a degraded portion needs to be replaced, so that it is possible to shorten replacement work.
Further, the assembly type utility pole includes a plurality of parts, and thus, each part is smaller than that of the utility pole in related art, so that it is possible to simplify work.
Thus, the present invention can provide a utility pole and a method for constructing the utility pole, which can simplify and improve efficiency of work at the time of new installation and replacement and can shorten a work period.
The anchor of the assembly type utility pole according to the present invention includes an earth auger on a surface thereof.
When the anchor in the ground is buried in the method, for constructing the utility pole according to the present invention, the anchor is rotated in an axial direction, and the ground is dug with the earth auger installed on the surface of the anchor.
A pre-hole can be expanded by simply rotating the earth auger, and the anchor is buried in the ground. This eliminates the need of backfilling and compaction.
The pole of the assembly type utility pole according to the present invention can be divided into at least two portions in a longitudinal direction.
In the method for constructing the utility pole according to the present invention, when the pole is divided into two or more portions in the longitudinal direction, stacking another divided pole on the other end of the pole after one end of the pole is fitted into the hole.
This enables replacement of only part of the utility pole.
The assembly type utility pole according to the present invention further includes a lock member that fills a gap between the pole and the hole, and the gap is generated when one end of the pole is fitted into the hole of the anchor.
By selecting a type of a spacer, utility poles (poles) of various diameters can be built.
A method for replacing the assembly type utility pole according to the present invention is a method for replacing an assembly type utility pole including:
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- a pole that can be divided into two or more portions in a longitudinal direction; and
- an anchor that is a substantially cylindrical object having a diameter larger than a diameter of the pole and is buried in the ground such that one end of a bottom surface of the substantially cylindrical object substantially matches the ground surface,
- in which one end of the pole is fitted into a hole of the anchor in which the pole and the anchor are coaxial, the method including:
- dividing the pole;
- lifting up an upper portion of the divided pole;
- removing a lower portion of the divided pole from the anchor;
- fitting one end of a lower portion of a new pole into the hole of the anchor; and
- connecting one end of an upper portion of the pole that is being lifted to the other end of a lower portion of the new pole.
Replacement work can be simplified by allowing only part of the parts of the assembly type utility pole to be replaced.
Each of the above inventions can be combined as far as possible.
Advantageous Effects of InventionAccording to the present invention, it is possible to provide a utility pole and a method for constructing the utility pole, which can simplify and improve efficiency of work at the time of new construction and replacement and can shorten a work period.
An embodiment of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment. Note that components having the same reference numerals in the present specification and the drawings indicate the same components.
Here, the pole 11 can be divided into at least two portions in a longitudinal direction (portions 11-1 and 11-2). Further, the anchor 12 has an earth auger 12b on a surface thereof. The assembly type utility pole further includes a lock member 13 that fills a gap between the pole 11 and the hole 12a, which is generated when one end of the pole 11 is fitted into the hole 12a of the anchor 12.
As in the example of
The anchor 12 is a structure to be buried in the ground. The anchor 12 has a plurality of blades (earth augers) 12b on the surface.
Further, the anchor 12 is provided with a hole 12a in advance at the center. The hole 12a is a hole for accommodating the pole 11.
Then, as illustrated in
A convex portion 11a is provided at the other end (opposite anchor side) of the portion 11-2. In addition, a concave portion 11b to be fitted with the convex portion 11a is provided at one end (anchor side) of the portion 11-1. The portion 11-2 and the portion 11-1 are connected by fitting the convex portion 11a and the concave portion 11b. In this way, as illustrated in
[Expected Effects]
Solution of the above-described three problems by the above-described assembly type utility pole will be described.
(Solution to Problem 1)
The anchor 12 has a structure having a larger diameter in the lateral direction than a buried portion of a utility pole in related art. Thus, ground supporting force is high, and thus, there is an advantage that a distance (depth) for digging a hole is shorter than before. In other words, the depth of the hole is reduced. Even if an inspection is performed visually, the distance for digging is reduced, so that the work period of a step of confirming the buried object can be shortened in the present assembly type utility pole.
(Solution to Problem 2)
Concrete and steel are mainly used as materials of the utility pole. The main cause of degradation is corrosion due to reaction with moisture and oxygen, and thus, the most of sites where degradation occurs are at the ground, which is a boundary between the ground and the utility pole. However, in a case of a utility pole in related art, in a case where degradation occurs in the utility pole, the whole utility pole is replaced.
On the other hand, in the method for replacing the assembly type utility pole, only a portion that degrades can be replaced.
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- step S01 of dividing the pole 11;
- step S02 of lifting the upper portion 11-1 of the divided pole 11;
- step S03 of removing the lower portion 11-2 of the divided pole 11 from the anchor 12;
- step S04 of fitting one end of a lower portion 11-2a of a new pole into the hole 12a of the anchor 12; and
- step S05 of connecting one end of the upper portion 11-1 of the pole being lifted to the other end of the lower portion 11-2a of the new pole.
In
-
- the “step of lifting the upper portion of the utility pole and a cable” corresponds to steps S01 and S02,
- the “step of replacing the lower portion of the utility pole” corresponds to steps S03 and S04, and
- the “step of connecting the lower portion of the utility pole and the upper portion of the utility pole” corresponds to step S05.
In the method in related art described with reference to
On the other hand, in the present replacement method, only the lower portion 11-2 of the utility pole and the lock member 13, which are expected to degrade, are replaced. The upper portion 11-1 of the utility pole and the lower portion 11-2 of the utility pole have a fitting structure. Thus, the upper portion 11-1 of the utility pole and the lower portion 11-2 of the utility pole can be separated from each other by lifting up the upper portion 11-1 of the utility pole and the cable attached thereto with a crane.
The anchor 12 and the lower portion 11-2 of the utility pole also have a fitting structure. Thus, while the upper portion 11-1 of the utility pole is lifted, the lower portion 11-2 of the utility pole can be replaced with the lower portion 11-2a of the new utility pole without excavating work. When the replacement of the lower portion 11-2 of the utility pole and the lock member 13 is completed, the upper portion 11-1 of the utility pole being lifted is fitted into the lower portion 11-2a of the new utility pole, whereby the replacement work is completed.
With this replacement method, the number of working days required for up to six days can be reduced to one day. In addition, cable work does not occur, and thus, work can be completed only by the utility pole work group. Further, it is not necessary to perform the excavation work in association with the replacement work. This can also reduce the work period. Furthermore, partial replacement is possible, so that an amount of building materials to be used can be reduced, which is efficient, and burden on the environment is also small.
(Solution to Problem 3)
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- step S11 of burying the anchor 12 of a substantially cylindrical object having a diameter larger than the diameter of the pole 11 in the ground so that one end of a bottom surface of the substantially cylindrical object substantially matches a ground surface; and
- step S12 of fitting one end of the pole 11 (the lower portion 11-2 of the utility pole) into the hole 12a of the anchor in which the pole 11 and the anchor 12 are coaxial; and
- step S13 of stacking another divided pole 11 (upper portion 11-1 of the utility pole) on the other end of the pole 11 (lower portion 11-2 of the utility pole).
Here, in the present method for constructing the pole, in step S11 of burying the anchor 12 in the ground, the anchor 12 is rotated in the axial direction, and the ground is dug with an earth auger installed on the surface of the anchor 12.
In
-
- the “step of excavation (by machine/manpower) and installing the anchor” corresponds to the following steps in step S11,
- the “step of lifting” and the “step of attaching the lock member” corresponds to step S12, and
- the “step of attaching the upper portion of the utility pole” corresponds to step S13.
The utility pole has a length of about 8.0 to 18 m and is built in a hole by heavy equipment and a human. In the method in related art of
In the present construction method, first, work of digging a hole (excavation step) is similar to the method in related art, but the anchor 12 has a structure that is larger (thicker), in the lateral direction, than the buried portion of the utility pole in related art, and the ground support force is high, so that the distance (depth) for digging a hole is shorter than that in the method in related art. This can shorten the work period. In particular, for a utility pole of about 8.0 to 9.0 m to which only a communication line is attached, about 1.5 m, which is ⅙ of the length of the utility pole, is required to be placed in the ground in the method in related art. On the other hand, in the present construction method, the distance (depth) by which the hole is dug by the anchor 12 is shortened, so that the amount of digging work by hand can be reduced, which is efficient.
The anchor installation step is performed after the excavation is completed to the target depth. The anchor 12 is installed by being attached to the tip of a pole construction track and buried with rotation of the earth auger. In this event, the anchor 12 enters the ground by pushing and expanding a hole dug in advance in such a manner as to drive a screw into a tree, and thus, backfilling and compaction are unnecessary.
Thereafter, a lifting step of lifting the lower portion 11-2 of the utility pole and fitting the lower portion 11-2 into the anchor 12 is performed using a crane, or the like. The lower portion 11-2 of the utility pole is shorter than that of the utility pole in related art. For this reason, a risk of coming into contact with an obstacle is low, and handling is easy, so that it is possible to move to a target position through a relatively simple path.
In a step of building a utility pole on the ground in related art, delicate vertical adjustment is required because an excavated hole is not leveled. On the other hand, in the present construction method, the hole 12a of the anchor 12 has a structure for fitting the lower portion 11-2 of the utility pole, and thus, vertical adjustment is unnecessary when the lower portion 11-2 of the utility pole is fitted to the anchor 12.
In the subsequent step of attaching the upper portion of the utility pole, the construction work is completed only by fitting the end of the upper portion 11-1 of the utility pole into the upper end of the lower portion 11-2 of the utility pole.
Thus, in the present construction method, it is possible to reduce the amount of excavation work, reduce backfilling and compaction work, improve handling performance of the utility pole, and reduce the vertical adjustment work, and thus, the work is efficient.
REFERENCE SIGNS LIST
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- 11 utility pole
- 11-1 upper portion of utility pole
- 11-2 lower portion of utility pole
- 12 anchor
- 12a hole
- 13 lock member
- 13a hole
- 13b spacer
Claims
1. An assembly type utility pole comprising:
- a pole; and
- an anchor that is a substantially cylindrical object having a diameter larger than a diameter of the pole and has a hole into which one end of the pole is fitted,
- wherein the pole and the anchor become coaxial when the one end of the pole is fitted into the hole of the anchor.
2. The assembly type utility pole according to claim 1, wherein the anchor has an earth auger on a surface thereof.
3. The assembly type utility pole according to claim 1, wherein the pole can be divided into at least two portions in a longitudinal direction.
4. The assembly type utility pole according to claim 1, further comprising:
- a lock member that fills a gap between the pole and the hole, the gap being generated when the one end of the pole is fitted into the hole of the anchor.
5. A method for constructing a utility pole, comprising:
- burying an anchor of a substantially cylindrical object having a diameter larger than a diameter of a pole in a ground such that one end of a bottom surface of the substantially cylindrical object substantially matches a ground surface; and
- fitting one end of the pole into a hole of the anchor in which the pole and the anchor are coaxial.
6. The method for constructing the utility pole according to claim 5, wherein when the anchor is buried in the ground, the anchor is rotated in an axial direction, and the ground is dug with an earth auger installed on a surface of the anchor.
7. The method for constructing the utility pole according to claim 5, wherein when the pole is divided into two or more portions in the longitudinal direction, stacking another divided pole on the other end of the pole after one end of the pole is fitted into the hole.
8. A method for replacing an assembly type utility pole that comprises:
- a pole that can be divided into two or more portions in a longitudinal direction;
- an anchor that is a substantially cylindrical object having a diameter larger than a diameter of the pole and is buried in a ground such that one end of a bottom surface of the substantially cylindrical object substantially matches a ground surface,
- in which one end of the pole is fitted into a hole of the anchor in which the pole and the anchor are coaxial, the method comprising:
- dividing the pole;
- lifting up an upper portion of the divided pole;
- removing a lower portion of the divided pole from the anchor;
- fitting one end of a lower portion of a new pole into the hole of the anchor; and
- connecting one end of an upper portion of the pole that is being lifted to the other end of the lower portion of the new pole.
Type: Application
Filed: Mar 16, 2021
Publication Date: May 9, 2024
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Tokyo)
Inventors: Tatsuya MOKI (Musashino-shi, Tokyo), Kenji INOUE (Musashino-shi, Tokyo), Hidenobu HIROTA (Musashino-shi, Tokyo), Yoshiyasu SATO (Musashino-shi, Tokyo)
Application Number: 18/281,438