JP2006200205A - Concrete utility pole and method of reinforcing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of reinforcing a concrete utility pole capable of achieving a remarkable reduction in construction time and cost, having high safety for operation, capable of providing sufficient strength by a simple method, and not affected by construction environment. <P>SOLUTION: When the concrete utility pole is reinforced by a reinforcing material, the reinforcing material is inserted into an opening part formed in the utility pole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concrete telephone pole and a reinforcing method thereof.

When concrete poles such as concrete telegraph poles deteriorate, they are usually replaced with new concrete pillars.
On the other hand, for telegraph poles that satisfy a predetermined standard until the expected service life is reached in consideration of aging, etc., life-prolonging measures may be taken by reinforcing them with reinforcing materials. For example, as disclosed in Japanese Patent Application Laid-Open No. 2003-314085, for example, a method is known in which an aramid fiber sheet is wound around the periphery of a deteriorated portion and is reinforced by hardening with a resin.

Among the above-mentioned conventional techniques, in the case of re-installation, temporary telephone poles are required until a new one is erected after removing the deteriorated telephone poles, and a temporary installation for temporarily setting these telephone poles. There is a problem that land is required, which increases the cost of replacing the utility pole, and takes time to dispose of the removed utility pole as waste.
In addition, in the case of relocation, it was necessary to negotiate in advance with the landowner and the electric power association before the start of construction, and it took about 1 week to replace one utility pole.

On the other hand, the reinforcement method using an aramid fiber sheet can improve the construction time and cost as compared with the method using the replacement, but it still requires a construction time of about half a day per one and is restricted by the construction environment.
Japanese Patent Laid-Open No. 2003-314085

  The present invention solves the above-described problems, and can achieve a significant reduction in construction time and cost, while at the same time providing high work safety and a sufficient strength with a simple method. In addition, an object of the present invention is to provide a method for reinforcing a concrete telephone pole that is not affected by the construction environment.

  Thus, according to the present invention, a concrete telephone pole reinforced by a reinforcing material, wherein the reinforcing material is inserted into the inside of the telephone pole from an opening provided in the telephone pole. A concrete telegraph pole to be reinforced, and when reinforcing the concrete telegraph pole with a reinforcing material, the reinforcement is inserted into the telegraph pole from an opening provided in the telegraph pole. A method is provided.

  According to the present invention, it is possible to achieve a significant reduction in construction time and cost, and at the same time, work safety is high, it is possible to obtain a sufficient strength with a simple method, and the influence of the construction environment. Since a method for reinforcing a concrete telephone pole that is not subject to the problem is provided, the construction time and cost can be greatly improved as compared with a method for reinforcing a telephone pole and a method using an aramid fiber sheet.

  Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view and a transverse sectional view showing one embodiment of a concrete telephone pole of the present invention. Normally, the concrete telephone pole 1 made of concrete has a substantially cylindrical shape that becomes slightly narrower toward the upper end, and a plurality of reinforcing bars and an outer peripheral part 11 made of concrete filled between the reinforcing bars, and an inner side of the outer peripheral part 11, Before the reinforcement is performed by the method shown in the present invention, a hollow portion 13 which is not filled with anything is provided. The thickness (wall thickness) of the outer peripheral part 11 is about 1/8 of the cross-sectional diameter of the telephone pole 1.

  The penetration length (embedding depth) of the telegraph pole 1 is about 1/6 of the pole length. A ground hole 3 for installing a ground is provided at a predetermined height from the ground. As an example, in the case of a concrete telephone pole, it is designed so that the grounding hole 3 is provided at a position of about 1800 mm from the ground when standing.

  The deteriorated portion 9 caused by cracks in the concrete at the outer peripheral portion 11 and the breakage of the reinforcing bars inside the concrete is caused by a combination of various conditions such as secular change and the situation of the standing place. As shown in FIG. 1, the deteriorated portion 9 is likely to be generated at a location relatively close to the ground. For this reason, the grounding hole 3 is often installed above the deteriorated portion 9.

FIG. 2 is a flowchart showing a work process of a concrete reinforcing method for a telephone pole as described above. First, in step S1, if the telephone pole is provided with a grounding hole, the cover attached to the surface of the grounding hole is removed, and this is used as an opening (step S3). On the other hand, when the grounding hole 3 does not exist in the telephone pole, a hole is drilled in the scaffolding bolt mounting portion using a core drill or the like, and an opening is appropriately provided (step S5).
The following steps will be described with respect to the case where the reinforcing material is injected from the ground hole, but the same applies when the hole is drilled in the scaffold bolt mounting portion.

  In the next step, after reinforcement, several aramid fiber reinforced resin material reinforcing steel substitutes (reinforcing materials) 7a, 7b,... Which become the support of the mortar filling portion 5 in FIG. Insert (step S7). The reinforcing steel substitute materials 7a, 7b,... Used at this time have a length that reaches the grounding hole 3 from the lowermost portion of the hollow portion 13 (step S7).

  After inserting the reinforcing bar substitute material by the above method, the mortar produced by appropriately mixing sand, cement, and water is filled to the vicinity of the grounding hole 3 by the mortar pump 21 as shown in FIG. 3 (step S9). ). Then, after filling with mortar, the ground hole cover is mounted again, and the surface of the deteriorated portion 9 is treated with a waterproof paint or the like (step S11). In the reinforcing method described above, sand may be filled in the vicinity of the lowermost portion of the hollow portion 13 before filling with mortar.

  As shown in FIG. 1, a plurality of reinforcing bar replacement materials 7a, 7b,... Made of aramid fiber reinforced resin material are inserted into the portion reaching the grounding hole 3 from the lowermost part of the concrete telephone pole reinforced in this way. Furthermore, it is filled with mortar in which cement and sand are kneaded with water and mixed.

  In addition, when reinforcing the deteriorated part formed above the ground hole 3, after the mortar filling by the above-described reinforcing method, for example, another reinforcing method such as reinforcing from the outside near the deteriorated part is used in combination. It is preferable to reinforce.

  Hereinafter, the structure of the present invention will be described with reference to an example of a strength confirmation test in reinforcement of a concrete telephone pole (hereinafter simply referred to as a power pole) having 21 cracks of about 0.1 mm and 10 years after standing. The effect will be described in more detail.

[Example 1]
The utility pole to be reinforced has a total weight of 700 kg, a pillar length of 16000 mm, a hollow substantially cylindrical shape with a diameter of 400 mm and a wall thickness of 50 mm. Ten reinforcing bars are arranged as pillars in the outer peripheral concrete, and the lowermost part is embedded at a position of 2500 mm from the ground. The grounding hole 3 is located about 1800 mm above the ground and has an elliptical shape of 60 mm in length and 30 mm in width. And this electric pole has passed 10 years after standing, and has 21 cracks of about 0.1 mm.

As disclosed in JP-A-3-103561, copolyparaphenylene 3,4′-oxydiphenylene terephthalamide fiber (“Technola” manufactured by Teijin Techno Products Co., Ltd.) is applied to the above utility pole by the method shown in FIG. After inserting the reinforcing steel substitute material obtained by impregnating the epoxy acrylate resin by the method, 200 l of mortar was filled up to the position reaching the ground hole 3 for reinforcement. The mortar is a mixture of sand: cement: water at a ratio of 3: 1: 2.
In the above-mentioned reinforcement, since it takes about one week for the filled mortar to harden, it was left for two weeks after the reinforcement, and then a strength confirmation test was performed.

  FIG. 4 is a schematic diagram for showing an outline of the strength confirmation test. First, the utility pole 1 is horizontally arranged, and at a position of 4000 mm from the lowest part of the utility pole at the time of standing (at the time of standing, 15 mm from the ground) After creating the deteriorated part 9 by cutting one of the reinforcing bars arranged in the concrete of the outer peripheral part 11 with sander, the part embedded at the time of standing (2500 mm from the lowest part of the utility pole) is fixed with a fixing device did. The fixing device is composed of fixing bases 31 and 33 and pillow materials 31a and 31b and 33a and 33b fastened to the fixing bases by jacks.

  The strength is measured until the test load is reached at a constant speed in a direction as perpendicular as possible to the center axis of the utility pole, with the load point at a position 250 mm from the end that is not fixed (upper end when standing). A load was applied. Thereafter, the direction of the load was rotated 180 degrees, and the load was applied until the test load was reached again. After the above operation, the load was continuously applied until the utility pole broke in either direction, and the maximum load indicated by the load meter was taken as the breaking load until that time, and the value of this maximum load was taken as the strength.

  The strength of the utility pole reinforced by the above method is 17.79 kN when the test load is 7.00 kN and the load is continuously applied downward, and is 15 to 15 when a new utility pole is measured under the same conditions. Compared to 16 kN, the value was not inferior.

In addition, according to the method of the present invention, the construction time is about 2 hours per utility pole, and the construction period can be significantly shortened compared to the conventional method of reinforcement or reinforcement by an aramid fiber sheet, Since the construction cost is 100,000 yen or less per one piece, the cost can be reduced to about 1/3 of the method by the replacement and about 1/2 of the reinforcing method by the aramid fiber sheet.
Further, since the reinforcement work is performed through the opening of the utility pole, the safety of the work is high, and it does not take time to process the removed utility pole as in the case of replacement.

  The method for reinforcing concrete telegraph poles according to the present invention can achieve a significant reduction in construction time and cost, and at the same time, the work safety is high, and it is possible to obtain sufficient strength with a simple method. In addition, since it is not affected by the construction environment, construction time and cost can be greatly improved as compared with a method of reinforcing a power pole or a reinforcement method using an aramid fiber sheet.

It is the longitudinal cross-sectional view and cross-sectional view which show one embodiment of the concrete telephone poles of this invention. It is a flowchart showing the work process of the reinforcement method of the telephone pole of this invention. It is sectional drawing which shows one embodiment of the reinforcement method of the concrete telephone pole of this invention. It is a schematic diagram for showing the outline | summary of the strength confirmation test of the concrete telephone pole of this invention.

Explanation of symbols

1 Concrete telephone pole 3 Ground hole (opening)
5 Mortar filling part 7a, 7b, 7c Steel bar substitute material 9 Deteriorating part 11 Outer part 13 Hollow part 21 Mortar pump 31, 33 Fixing base 31a, 31b, 33a, 33b Pillow material

Claims (4)

  A concrete telephone pole reinforced with a reinforcing material, wherein the reinforcing material is inserted into an inside of the telephone pole from an opening provided in the telephone pole.   The concrete telephone pole according to claim 1, wherein the reinforcing material is a reinforcing material made of a plurality of reinforcing bar substitute materials and mortar.   The concrete telephone pole according to claim 1 or 2, wherein the reinforcing steel substitute material is an aramid fiber reinforced resin material.   A method for reinforcing a concrete telephone pole, comprising: inserting a reinforcing material into an inside of a telephone pole from an opening provided in the telephone pole when the concrete telephone pole is reinforced with a reinforcing material.

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