JP3488191B2 - Reinforcing method for the root of concrete electric pole - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a construction method for reinforcing a root portion of a concrete electric pole.

[0002]

2. Description of the Related Art Conventionally, it has been practiced to attach a sheet of aromatic polyamide fiber (aramid fiber), which has a higher tensile strength than concrete, to the underground portion, that is, the root portion of a concrete columnar body in use, for reinforcement. In this case, the adhesive resin such as an epoxy resin impregnated in the sheet is cured to form FRP, and then the root portion is backfilled in the ground. This is because if backfilling is performed before the adhesive resin is cured, the uncured adhesive resin is incorporated into the backfilling sand, resulting in incomplete FRP, and the reinforcing effect of the reinforcing fiber sheet is reduced. It takes several days for the adhesive resin to harden, and backfilling cannot be performed during this period.

[0003]

In the utility pole of the columnar body, if the adhesive resin is allowed to cure with its root exposed, it is necessary to be prepared for a situation such as collapse, which prevents danger and protects the electric wire. There is also the inconvenience that it takes time and cost because measures are also required. The reinforcing fibers of the sheet are usually is Oriented in one direction, to reinforce the electric pole in such a sheet, as shown in FIG. 1, the sheet b in the longitudinal direction of the electric pole a It was necessary to carry out the reinforcing work in two steps of sticking and then winding the sheet horizontally from above. The work of adhering the sheet b in the height direction of the buried utility pole a requires manpower and is poor in workability.

It is an object of the present invention to provide a method for reinforcing construction of an underground concrete utility pole, which can solve such inconvenience and safely finish the reinforcement work in a short time.

[0005]

In the present invention SUMMARY OF], and have contact to the reinforcing construction method for a concrete utility pole buried roots in the soil,
The root is dug up to the extent that the concrete utility pole does not fall from the soil, and a sheet of reinforcing fiber having a larger tensile strength than concrete such as aromatic polyamide fiber is attached to the peripheral surface of the utility pole by impregnating it with an adhesive resin, the outer periphery entire sticking part of該根portion covered with a synthetic resin film, by backfilling the root of the concrete electric pole before the adhesive resin is cured,
The above-mentioned purpose is achieved. Then , a protective layer is provided on the reinforcing fiber sheet adhered to the peripheral surface of the concrete utility pole by winding a wire, attaching an iron plate, or coating ceramics, thereby providing a reinforcing fiber of the sheet. It is possible to prevent damage, and the synthetic resin film may be extended to cover the affixing portion of the reinforcing fiber sheet on the ground portion.

[0006]

When the embodiment of the embodiment of the invention Based on the drawings the invention will be described, reference numeral 1 have you in FIG. 2, the root portion 1 in the ground 2
a shows a can buried concrete made of utility poles. When it becomes necessary to reinforce the concrete utility pole 1 due to deterioration or an increase in the burden load, the root portion 1a is dug up from the soil, and the peripheral surface of the utility pole 1 is made of concrete such as aromatic polyamide fiber or carbon fiber. Also, the sheet 3 produced by knitting or weaving fibers having high tensile strength is attached by an adhesive resin such as an epoxy resin for reinforcement. However, if the backfilling of the root portion 1a is performed before the adhesive resin is uncured, the FRP becomes incomplete as described above, and if the adhesive resin is cured, it takes reinforcement time and safety measures are required. In the case of the invention, before the adhesive resin is cured, the outer periphery of the sticking portion of the sheet 3 of the root portion 1a is covered with a synthetic resin film 4 and backfilled in the soil 2 to achieve the above object. .

The reinforcing construction method of the present invention will be further described below.
As shown in FIG. 2 (1), the root portion 1a of the concrete electric pole 1 to be reinforced embedded in the soil 2 is dug up from the soil as shown in FIG. 2 (2), and the groundwork is performed by the disk sander 5 or the like. (FIG. 2 (3)), the primer 6 is applied and then the adhesive resin 7 is undercoated (FIG. 2 (4) and FIG. 2).
(5)). Then, a sheet 3 of reinforcing fibers is attached to the telephone pole 1, and an adhesive resin 7 is overcoated on the sheet 3 (see FIG. 2).
(6) and FIG. 2 (7)). After that, the synthetic resin film 4 is wound around the root portion 1a, backfilled in the soil 2, and the protective layer 11 is further provided on the ground portion 1b by painting or the like to finish (FIG. 2).
(8) to FIG. 2 (10)).

The steps (5) to ( 7 ) in FIG. 2 are repeated depending on the type of the sheet 3 and the required number of reinforcing layers, and the sheet 3 is laminated in multiple layers as shown in FIG. In the case of FIG. 3, the peripheral surface of the utility pole 1 is grounded by a disk sander, the primer 6 is applied, the surface is adjusted with a putty, and the sheet 3 is attached to a plurality of layers.
The epoxy-based adhesive resin 7 is undercoated, the sheet 3 is attached thereon, and then the adhesive resin 7 is overcoated several times, and then the synthetic resin film 4 is wound. .

As shown in FIG. 4, the sheet 3 is formed into a tape by arranging reinforcing fibers 3a such as aromatic polyamide fibers in one direction and forming fibers such as nylon in a direction orthogonal to the reinforcing fibers 3a. When using this sheet 3 formed by knitting, a reinforcing layer attached to the peripheral surface of the utility pole 1 with the direction of the reinforcing fiber 3a aligned in the length direction thereof, and in the circumferential direction of the utility pole 1. The utility pole 1 is reinforced by forming a reinforcing layer which is attached by aligning the directions of the reinforcing fibers 3a. This winding in the circumferential direction is wound by a spiral while pulling as shown in FIG. 5, and when several layers at the beginning and end of the winding are overlapped and stopped, the sheet to be stuck in the lengthwise direction of the utility pole 1 is fixed. The length can be reduced and the cost can be reduced.

As described above, since the workability of attaching the tape 3 in the height direction of the telephone pole 1 is poor, the reinforcing fibers 3a are arranged in two orthogonal directions as shown in FIG. To produce a sheet 3 knitted in a tape shape, and by sticking the sheet 3 by partially providing an overlapping portion 9 in the circumferential direction of the utility pole 1 as shown in FIG. The circumferential direction can be reinforced at the same time.

[0011] synthetic resin film 4, as shown in FIGS. 8 and 9, wound around the outer periphery of the sheet 3 having been subjected to sticking, fixed by winding band 10 and the cord and the top and bottom, soil in this state Will be backfilled in. Then, after that, a protective layer 11 is provided on the exposed portion 1b on the ground by applying a metal wire, a metal plate, or a ceramic paint to protect the reinforcing fibers of the sheet 3 from being cut.

It is desirable that the primer 6 applied as shown in FIG. 2 (4) is dried before the adhesive resin 7 is undercoated, and the drying is performed for a short time without adhering dust or the like. It is advantageous in work to finish with. As the primer 6, a solventless type or a solvent type containing a solvent such as thinner is used. In order to finish the drying in a short time, a solventless type primer is thinly applied, or in the case of a solvent type primer, The coated surface is heated so that the solvent can be removed quickly. Then, a sheet 3 of reinforcing fibers is attached to the utility pole 1, an adhesive resin 7 is overcoated on the sheet 3, and a synthetic resin film 4 is wound around the root 1a and backfilled in the soil 2.

If the adhesive resin 7 is uncured, the above-ground portion of the sheet 3 of the telephone pole 1 where the sheet 3 is adhered will be bleached due to rain, will be adhered to people, and dust and insects will adhere to it. Since this is not preferable, the synthetic resin film 4 covering the root 1a is extended so as to also cover the above-ground part,
If the synthetic resin film 4 covering the above-ground portion is peeled off after the adhesive resin 7 has dried, the above-ground portion can be sufficiently cured.

[0014]

EXAMPLES diameter 40 cm, a concrete electric pole height 16m, in order to reinforce the concrete electric pole 1 root 1a is embedded at a depth of 2.5m in the soil, the root portion 1a 0. I dug up 9m. Then, the peripheral surface of the electric pole 1 was repaired by a disk sander 5 and a primer 6 was applied. After that, the surface was adjusted with a putty, the epoxy-based adhesive resin was undercoated, the reinforcing fiber sheet 3 shown in FIG. 6 was wound, and the adhesive resin was overcoated and impregnated. This undercoating, the winding of the sheet 3 and the topcoating are repeated twice to form two reinforcing layers, and then the synthetic resin film 4 of polyethylene is wound around the root 1a while the adhesive resin is uncured and fixed with the band 10. And then backfilled in the soil. It took 3 hours
It was time. For confirmation, the root 1a was dug up 5 days after backfilling, and the cured state of the adhesive resin was examined. Since it takes 24 hours to cure the adhesive resin, it is more efficient than waiting for it to be backfilled, and since it can be supported by the work vehicle during the reinforcement work, it did not collapse. Further, by using the sheet 3 in which the reinforcing fibers are arranged in two directions orthogonal to each other, the reinforcing fibers arranged in the longitudinal direction can be reinforced by simply wrapping and sticking them in the circumferential direction of the utility pole 1 and quickly. I was able to work. At a suitable time after backfilling the root portion 1a, a ceramic coating was applied to the above-ground portion 1b to form the protective layer 11. Since the protective layer 11 is not damaged by a knife or the like, the reinforcing fibers of the sheet 3 can be protected and the reinforcing effect can be maintained for a long time.

[0015]

As described above, according to the present invention, the concrete pole having the root embedded in the soil is dug up to the extent that the concrete pole does not collapse, and a sheet of reinforcing fiber is attached to the peripheral surface of the pole by impregnating the resin with adhesive. Before the adhesive resin hardens, the outer periphery of the sticking part of the root part is covered with a synthetic resin film and backfilled, so that the sheet becomes FRP in the soil and the reinforcement work is completed at a low cost in a short time. By providing a protective layer on the adhered reinforcing fiber sheet as claimed in claim 2, cutting of the reinforcing fiber of the sheet can be prevented and a long-term reinforcing effect can be obtained. Has the effect of.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional method for reinforcing concrete electric poles .

FIG. 2 is an explanatory diagram of a reinforcing method of the present invention.

FIG. 3 is an enlarged sectional view of a reinforced portion.

FIG. 4 is an explanatory view of a sheet

FIG. 5 is a perspective view showing a fixed state of the seat.

FIG. 6 is an explanatory diagram of another sheet

7 is a perspective view of a reinforced state using the seat of FIG.

FIG. 8 is a perspective view of a synthetic resin film in a wound state.

9 is an enlarged cross-sectional view taken along line 9-9 of FIG.

[Explanation of symbols]

1 concrete utility pole, 1a root part, 1b ground part, 2
In the soil, 3 sheets, 4 synthetic resin film, 7 adhesive resin, 11 protective layer .

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akira Takada               1-9-1, Nakase, Mihama-ku, Chiba City, Chiba Prefecture                 Mitsui Construction Co., Ltd. Makuhari Main Store (72) Inventor Toshio Yamada               2-31-1 Nihonbashihamacho, Chuo-ku, Tokyo                 NTT Infrastructure Net Co., Ltd.               Inside the company                (56) Reference JP-A-6-322998 (JP, A)                 JP 10-8423 (JP, A)                 JP-A-5-332031 (JP, A)                 JP-A-9-250247 (JP, A)                 JP-A-9-60024 (JP, A)                 JP-A-10-317373 (JP, A)

Claims (3)

(57) [Claims] We claim: 1. have you reinforcing construction method for a concrete utility pole buried roots in the soil, dig the root to the extent that the soil does not fall down the concrete electric pole, such as aromatic polyamide fibers on the peripheral surface of the electric pole the sheet tensile strength is greater reinforcing fibers than the concrete impregnated with a bonding resin adhered to cover the outer periphery entire sticking part of該根part a synthetic resin film, a concrete utility pole before the adhesive resin is cured
A method for reinforcing a root portion of a concrete utility pole, which is characterized by backfilling the root portion. 2. A wire is wound, an iron plate is mounted on a reinforcing fiber sheet attached to the peripheral surface of the concrete utility pole,
Alternatively, the method of reinforcing a root portion of a concrete electric pole according to claim 1, wherein a protective layer is provided by coating ceramics or the like. 3. The method for reinforcing construction of a root portion of a concrete utility pole according to claim 1, wherein the synthetic resin film is extended to cover a portion of the ground portion where the sheet of reinforcing fiber is attached.