JP2015010340A - Construction method and execution method for preventing collapse of concrete utility pole during earthquake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method and an execution method for preventing a collapse of a concrete utility pole during an earthquake, by inserting a core material for preventing the collapse of the concrete utility pole during the earthquake.SOLUTION: A construction method for preventing a collapse of a concrete utility pole during an earthquake is used to prevent the collapse of the concrete utility pole during the earthquake. A breakage of the concrete utility pole 1 is prevented by inserting a core material 4 into the concrete utility pole 1 and arranging the core material 4 in an erection part 3 for the concrete utility pole 1.

Description

  The present invention relates to a method for preventing collapse of a concrete utility pole during an earthquake and a method for its construction.

  Conventionally, as a seismic measure for concrete electric poles (for example, PC electric train poles), there has been only a limited construction method such as winding a steel plate from the outside of a concrete electric pole. These methods mainly focus on reducing damage during an earthquake.

JP 2010-193557 A JP 2011-226172 A

Conventional seismic countermeasures for concrete utility poles have been mainly intended to reduce damage by increasing the deformation performance of utility poles. However, when an earthquake greater than expected occurs, deformation exceeding the deformation performance occurs, and the utility pole breaks.
Moreover, in the utility pole on the viaduct, the relationship between the period of the viaduct and the period of the utility pole has a great influence on the response of the utility pole. However, the calculation of the viaduct period includes errors and may behave differently from the prediction of the utility pole response in advance.

  Furthermore, the upper end of the electric pole is opened, and an opening forming step for forming an opening communicating with the hollow portion of the electric pole, and a reinforcing rod that is formed in substantially the same length as the electric pole and can be inserted into the hollow portion of the electric pole Reinforcing rod insertion step for inserting into the hollow portion, a hardening material charging step for charging the hollow portion with a hardening material, a lower fixing step for fixing the reinforcing rod at the lower portion of the utility pole, and an upper fixing step for fixing the reinforcing rod at the upper portion of the utility pole 1 And what has the opening part sealing process which seals an opening part has already been disclosed.

Such a method of reinforcing a power pole requires a reinforcing bar having substantially the same length as that of the power pole, and is configured so that a horizontal force is shared by the reinforcing bar to improve rigidity and proof strength. And only the hardening material was thrown into the lower part of the reinforcement rod, and the fixing was not perfect.
In 2012, the seismic design standards for railway structures were revised, and even when an earthquake that exceeds the expected level of the design occurs, crisis resistance is defined as the performance that will not cause as much damage as possible. Yes.

  In view of such a situation, in the present invention, by inserting a core material such as H steel into the utility pole, (1) the deformation performance of the utility pole is not changed, and only in the event of an emergency, Prevents utility poles from breaking and prevents serious events such as vehicle collisions. Furthermore, when the inserted H steel and the utility pole are integrated with mortar, etc., (2) it can be expected to avoid resonance between the concrete utility pole and its civil engineering structure by shortening the period of the utility pole. .

  As described above, the present invention provides a method for preventing collapse of a concrete power pole during an earthquake and a construction method thereof by inserting a core material for preventing the collapse of the concrete power pole during an earthquake into the power pole. Objective.

In order to achieve the above object, the present invention provides
[1] In the method of preventing collapse of concrete power poles during an earthquake, a core material is inserted into the concrete power pole, and the core material is disposed in the built-in portion of the concrete power pole to prevent breakage of the concrete power pole. It is characterized by.
[2] In the method for preventing collapse of a concrete utility pole as described in [1] above, mortar filling is performed on a building portion of the concrete utility pole, and the fixing degree of the core material to the concrete utility pole is secured. The deformation of the concrete electric pole is suppressed by shortening the period and avoiding resonance with the civil engineering structure.

[3] The concrete collapse prevention method for a concrete electric pole according to [1] or [2] above, wherein the core material is a steel material.
[4] In the concrete collapse prevention method for concrete utility poles according to [3] above, the steel material is H steel or round steel.
[5] In the method for preventing collapse of a concrete power pole during an earthquake, the top end cap of the concrete power pole is removed, a core material is inserted into the concrete power pole, and the core material is built. The core material is solidified and filled by injecting mortar into the inside, and the top end cap of the concrete electric pole is attached.

[6] In the concrete collapse prevention construction method for a concrete electric pole according to [5] above, the core material is a steel material.
[7] In the method for preventing collapse of a concrete utility pole according to [5] above, the steel material is H steel or round steel.
[8] In the method for preventing collapse of concrete electric poles according to any one of [5] to [7] above, the concrete electric poles to be built on the viaduct should be It is characterized by construction from the road or overpass.

According to the present invention, the following effects can be achieved.
(1) By inserting a rigid core material into the bottom of a concrete power pole, the concrete power pole can be prevented from collapsing.
(2) As the core material, for example, steel materials such as H steel and round steel, which are required to have rigidity and proof strength sufficient to prevent the concrete electric pole from falling, can be applied.

Moreover, since it is necessary to prevent a core material from collapsing at the time of a utility pole breakage, it is necessary to be fully fixed. Then, after inserting a core material into an inside of a utility pole, sufficient fixing degree is ensured by implementing construction, such as filling a mortar in a built-in part.
Furthermore, as a construction method, it is possible to remove the cap on the upper part of the electric pole and insert the core material from the upper end of the electric pole in order not to damage the electric pole as much as possible.

  In addition, when construction is performed on a utility pole built on a viaduct, construction may be performed from a side road or construction from an elevated bridge.

It is a schematic diagram of the collapse prevention method at the time of earthquake of the concrete electric pole by core material insertion which shows the Example of this invention. It is a schematic diagram which shows the fixing method of the core material of the concrete electric pole on the viaduct which shows the Example of this invention. It is a schematic diagram of the construction method for collapse prevention at the time of the earthquake of the concrete electric pole by core material insertion from a side road by the aerial work vehicle which shows the Example of this invention. It is a schematic diagram of the construction method for collapse prevention at the time of the earthquake of the concrete electric pole by the core material insertion performed by an aerial work vehicle from the elevated position which shows the Example of this invention.

  The method for preventing collapse of a concrete electric pole by earthquake according to the present invention inserts a core material into a concrete electric pole, arranges the core material in a built-in portion of the concrete electric pole, and breaks the concrete electric pole To prevent.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic diagram of a method for preventing collapse of a concrete power pole by inserting a core material according to an embodiment of the present invention. FIG. 1 (a) is a diagram showing a concrete power pole, and FIG. The figure which shows the state which inserted the core material in the construction part of the utility pole, FIG.1 (c) is the figure which shows the state which inject | poured mortar into the construction part of the concrete utility pole, and integrated the core material and the concrete utility pole. It is.

In this figure, 1 is a concrete electric pole, 2 is a hollow portion of the concrete electric pole 1, 3 is a built-in portion, and 4 is a core material inserted about 3 m from the lower portion of the hollow portion 2. As the steel material, H steel (round steel) is used. Reference numeral 5 denotes a mortar to be injected after inserting the H steel as the core material 4.
Thus, since the concrete utility pole 1 becomes the cavity 2, after inserting the core material 4 (H steel or round steel) into the built-in part 3 of the cavity 2, the mortar 5 is injected, and the core material 4 Is held in the erected portion 3 of the cavity 2.

FIG. 2 is a schematic diagram showing a method of fixing a core member of a concrete electric pole on a viaduct according to an embodiment of the present invention. FIG. 2A shows a case where only an embedded portion of a concrete electric pole is fixed (basic Fig. 2 (b) shows a case where the power pole and the core material are integrated with mortar.
When fixing only the embedding portion of the concrete electric pole, as shown in FIG. 2A, the core material 14 is inserted into the erection portion 13 of the concrete electric pole 12 embedded in the viaduct 11, and the erection is performed. The core material 14 is fixed only to the portion 13 with the mortar 15. Moreover, when integrating a utility pole and a core material with a mortar, as shown in FIG.2 (b), after insertion of the core material 14, the concrete electric pole 12 and the core material 14 are integrated with the mortar 16. FIG. I do.

  FIG. 3 is a schematic diagram of a construction method for preventing collapse of a concrete electric pole by inserting a core material from a side road by an aerial work vehicle showing an embodiment of the present invention, and FIG. Fig. 3 (b) shows the removal of the top cap of a concrete utility pole by car, Fig. 3 (b) shows the construction of the core material on the concrete utility pole, and Fig. 3 (c) shows the mortar consolidation of the concrete utility pole. FIG. 3 (d) is a diagram showing the restoration of the top end cap of the concrete utility pole.

First, as shown in FIG. 3A, the top end cap 24 of the concrete electric pole 23 built in the built-in portion 22 is removed by the aerial work vehicle (truck type h = 20 m) 21.
Next, as shown in FIG.3 (b), the core material (H steel) 26 is built in the built-in part 22 of the built-in concrete electric pole 23 by the rough terrain crane (10t hanging) 25. As shown in FIG.
Next, as shown in FIG.3 (c), the mortar 28 from the mortar bucket 27 is inject | poured in the concrete electric pole 23, and the core material (H steel) 26 is solidified.

Finally, as shown in FIG. 3D, the top cap 24 of the concrete power pole 23 is attached.
In this way, the concrete electric pole is prevented from collapsing at the time of an earthquake from a side road by an aerial work vehicle.
FIG. 4 is a schematic diagram of a construction method for preventing collapse of a concrete utility pole during an earthquake by inserting a core material performed by an aerial work vehicle from an elevated position showing an embodiment of the present invention, and FIG. Fig. 4 (b) is a diagram showing the concrete power pole being removed from the top of the concrete power pole by a work vehicle. Fig. 4 (b) is a diagram showing the construction of the core material on the concrete power pole by the track crane. Fig. 4 (d) is a diagram showing the installation of the top end cap of a concrete utility pole.

First, as shown in FIG. 4A, the top end cap 34 of the concrete electric pole 33 built in the built-in portion 32 is removed by an aerial work vehicle (truck type h = 20 m) 31.
Next, as shown in FIG. 4 (b), a core material (H steel) 36 is built in the built-in portion 32 of the built-in concrete electric pole 33 by the track crane 35.
Next, as shown in FIG.4 (c), the mortar 38 is inject | poured in the concrete electric pole 33 from the mortar bucket 37, and the core material (H steel) 36 is solidified.

Finally, as shown in FIG.4 (d), the top end cap 34 of the concrete electric pole 33 is attached.
In this way, a construction method for preventing collapse of a concrete electric pole during an earthquake is applied from an elevated work vehicle to an elevated work vehicle.
ADVANTAGE OF THE INVENTION According to this invention, the seismic reinforcement of a concrete electric pole can be implemented with a simple structure, a collapse prevention construction method, and its construction method.

A method of embedding a core material inside a concrete power pole so that the train running space will not be disturbed even if an electric pole breaks due to an unexpected earthquake, or when the power pole and core material are combined In addition to increasing the proof stress of the utility pole, it is also expected to increase the rigidity of the utility pole and reduce the resonance with the viaduct.
In concrete utility poles on the viaduct, although the relationship between the frequency of the viaduct and the frequency of the utility pole has a dominant influence on the response of the utility pole, there are actually more or less errors in the calculation results of the frequency of the viaduct. However, according to the present invention, there is an advantage that it is possible to sufficiently cope with such a case.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The method for preventing collapse of a concrete power pole by an insertion of a core material according to the present invention and the construction method thereof include a core material for preventing collapse of a concrete power pole during an earthquake, and a method for preventing the collapse of a concrete power pole during an earthquake and its It can be used as a construction method.

1,12,23,33 Concrete utility pole 2 Cavity part of concrete utility pole 3,13,22,32 Built-in part 4,14,26,36 Core material (H steel, round steel)
5, 15, 16, 28, 38 Mortar 11 Viaduct 21, 31 Aerial platforms 24, 34 Top cap 25 Rough terrain crane 27, 37 Mortar bucket 35 Rail crane

Claims (8)

  A method for preventing collapse of a concrete electric pole during an earthquake, wherein a core material is inserted into a concrete electric pole, and the core is arranged in a built-in portion of the concrete electric pole to prevent breakage of the concrete electric pole.   2. The method of preventing collapse of a concrete utility pole according to claim 1, wherein mortar filling is performed on a built-in portion of the concrete utility pole to ensure the degree of fixing of the core material to the concrete utility pole, and A method for preventing collapse of concrete utility poles during earthquakes, characterized by shortening the period of utility poles and suppressing deformation by avoiding resonance with civil engineering structures.   3. The method for preventing collapse of a concrete electric pole during earthquake according to claim 1 or 2, wherein the core material is a steel material.   4. The method for preventing collapse of a concrete electric pole according to claim 3, wherein the steel material is H steel or round steel. In the method of preventing collapse of concrete power poles during earthquakes,
(A) Remove the top cap of the concrete utility pole,
(B) Inserting a core material into the concrete electric pole to build the core material,
(C) By filling mortar into the concrete electric pole, the core material is solidified and filled;
(D) A method for preventing collapse of a concrete utility pole during an earthquake, comprising attaching a top end cap of the concrete utility pole.   6. The method for preventing collapse of a concrete electric pole according to claim 5, wherein the core material is a steel material.   6. The method for preventing collapse of concrete electric poles during earthquakes according to claim 5, wherein the steel material is H steel or round steel. The concrete electric pole collapse prevention construction method according to any one of claims 5 to 7, wherein when the concrete electric pole to be built on the viaduct is to be constructed , the construction is performed from the side road or on the overpass. A construction method for preventing collapse of a concrete utility pole during an earthquake.

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