JP3571317B2 - Concrete column reinforcement method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a concrete column reinforcing method for reinforcing a concrete column such as a utility pole or a pile.
[0002]
[Prior art]
A conventional method for reinforcing a concrete pillar such as a telephone pole will be described with reference to FIG. As shown in FIG. 2 (a), in order to reinforce the circular base end of the concrete columnar body 1 whose lower end is buried and fixed on the ground 7, the circle is enlarged in FIG. 2 (b). As shown, first, an adhesive resin 3 is applied to the outer peripheral surface of the concrete columnar body 1, and an aromatic polyaramid fiber (aramid fiber) or the like having a higher tensile strength than reinforced concrete is applied on the applied adhesive resin 3. The reinforcing fiber sheet 2 is wound and adhered. In addition, when the reinforcing fiber sheet 2 is wound from above the adhesive resin 3, the adhesive resin 3 impregnates the reinforcing fiber sheet 2 and also leaches on the surface of the reinforcing fiber sheet 2.
[0003]
Then, before the adhesive resin 3 is cured, the reinforcing fiber sheet 2 is impregnated into the adhesive resin 3 and leached to the surface of the adhesive resin 3 so that dust or the like adheres to the surface or adheres to human clothes. In order to prevent sticking, as shown in FIG. 2C, a synthetic resin film 4 is stuck on the reinforcing fiber sheet 2 to cover it.
[0004]
Then, after attaching the synthetic resin film 4 in this way, the adhesive resin 3 is waited for curing, and after the adhesive resin 3 is cured, the synthetic resin film 4 is peeled off. It takes about 8 hours for the adhesive resin 3 to cure, for example.
[0005]
When the adhesive resin 3 is thus hardened and the synthetic resin film 4 is peeled off, the reinforcing fiber sheet 2 impregnated with the adhesive resin 3 which has been hardened under the adhesive resin 3 is integrated with each other to form an FRP (reinforced plastic). However, a paint 5 is applied to the surface of the FRP-like material as shown in FIG.
[0006]
After the paint 5 is applied, it waits until the paint 5 is dried, for example, until the next day, and after the paint 5 is completely dried, as shown in FIG. The synthetic resin sheet 6 is attached, and the reinforcing work of the concrete column 1 is completed. The synthetic resin sheet 6 has an irregular surface so as to prevent, for example, surrounding third parties from sticking a poster or the like on the concrete columnar body 1. It also has.
[0007]
[Problems to be solved by the invention]
In the conventional method for reinforcing the concrete columnar body 1 described above, after the adhesive resin 3 is cured, the synthetic resin film 4 is peeled off, the paint 5 is applied, and after the paint 5 is further dried, Although the synthetic resin sheet 6 is attached, it is necessary to first wait for about 8 hours until the adhesive resin 3 is cured, and it takes time until the paint 5 is dried. In addition, it takes a very long time of several days until the concrete column reinforcement work is completed, and it is necessary to go to the site over many days and work, not one day, It is very inefficient and uneconomical.
[0008]
Further, as described above, since the painted surface to which the paint 5 is applied is not uniform, it is necessary to further remove the unevenness on the painted surface in order to make the surface uniform, which is very inefficient.
[0009]
Furthermore, in the conventional method, there is a wasteful operation of peeling off the synthetic resin film 4 stuck on the reinforcing fiber sheet 2 impregnated with the adhesive resin 3, but such a work of peeling off is not only wasteful, There is also a problem of garbage that may be removed from the removed synthetic resin film 4.
[0010]
The present invention has been made in view of the above, and it is an object of the present invention to eliminate the need to wait for the curing of an adhesive resin, and to efficiently and economically reduce the amount of concrete in a very short time without using any paint. An object of the present invention is to provide a method for reinforcing a concrete column which can reinforce the column.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention according to claim 1 applies an adhesive resin to an outer peripheral surface of a concrete columnar body, and attaches a reinforcing fiber sheet having a large tensile strength to the applied adhesive resin before curing. Attached and adhered, the adhesive resin is leached on the surface of the reinforcing fiber sheet by impregnating the reinforcing fiber sheet with the adhesive resin, and further , from the top of the reinforcing sheet before the leached adhesive resin is cured. Overcoating the adhesive resin, further ensuring the impregnation of the adhesive resin into the reinforcing fiber sheet, before the adhesive resin is cured, pasting a sheet for pasting prevention on the reinforcing fiber sheet. Thus , the gist is that the reinforcement of the concrete columnar body is completed within the curing time of the adhesive resin .
[0012]
According to the first aspect of the present invention, an adhesive resin is applied to the outer peripheral surface of the concrete columnar body, and a reinforcing fiber sheet having high tensile strength is attached and adhered on the adhesive resin, and the adhesive resin is reinforced. Before the fiber sheet is impregnated and the adhesive resin is cured, the adhesive resin is further coated on the reinforcing fiber sheet, and a sheet for preventing sticking is attached. Resin impregnation can be ensured, substantial working time can be greatly reduced, work efficiency and economy can be improved, sufficient reinforcement performance over a long period of time can be obtained, and furthermore, prevention of sticking is completely prevented. It is.
[0013]
Further, the present invention according to claim 2 is characterized in that, in the invention according to claim 1, the reinforcing fiber sheet is formed of aromatic polyaramid fiber.
[0014]
According to the second aspect of the present invention, the reinforcing fiber sheet is formed of aromatic polyaramid fiber, and sufficient reinforcing performance can be obtained.
[0015]
Further, in the present invention according to claim 3, in the invention according to claim 1, the sheet for preventing sticking is formed of a synthetic resin having irregularities on its surface, and also has an ultraviolet transmission preventing function. That is the gist.
[0016]
According to the third aspect of the present invention, since the sheet for preventing sticking is formed of a synthetic resin having irregularities on its surface and has a function of preventing ultraviolet light transmission, the sheet for sticking to a concrete column is required. In addition to being able to prevent it properly, it is also possible to properly prevent ultraviolet transmission.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining a concrete column reinforcing method according to one embodiment of the present invention. In the method of reinforcing a concrete column according to this embodiment, as shown in FIG. 1A, a concrete column, such as a reinforced concrete electric pole having a diameter of about 40 cm and a height of 16 m, which is embedded and fixed on the ground 7. In order to reinforce the base end surrounded by a circle about 2.5 m above the root of the base 1, first, as shown in FIG. And a reinforcing fiber sheet 2 made of an aromatic polyaramid fiber (aramid fiber) having a tensile strength higher than that of reinforced concrete is adhered onto the applied adhesive resin 3 in, for example, two layers. . Note that, when the reinforcing fiber sheet 2 is stuck on the adhesive resin 3 in this manner, the adhesive resin 3 impregnates the reinforcing fiber sheet 2 and also oozes out on the surface of the reinforcing fiber sheet 2. Then, the adhesive resin 3 is further overcoated on the reinforcing fiber sheet 2 to further ensure that the reinforcing fiber sheet 2 is impregnated with the adhesive resin 3.
[0018]
After the two reinforcing layers made of the reinforcing fiber sheet 2 are formed in this way, before the adhesive resin 3 is cured, as shown in FIG. Then, a synthetic resin sheet 6 made of a resin or the like is attached to this, and the substantial work of the present embodiment ends. The synthetic resin sheet 6 has a function of preventing transmission of ultraviolet rays and a function of preventing sticking, and has irregularities formed on the surface thereof. This irregularity makes it impossible to attach a sticker such as a poster. ing. Even if the sticking paper is stuck, the sheet is immediately peeled off due to the unevenness of the synthetic resin sheet 6.
[0019]
As described above, the actual operation of the concrete column reinforcing method according to the present embodiment is completed by the operation until the synthetic resin sheet 6 is pasted on the reinforcing fiber sheet 2 impregnated with the adhesive resin 3, and thereafter, the bonding is simply performed. It is sufficient that the curing of the resin 3 is allowed to occur naturally, but the work time required so far is very short, for example, about 3 hours. The work can be completed in a very short time and efficiently, without requiring a long time, for example, several days, including a wait time until the paint is dried and a wait time until the paint is dried. By pasting the synthetic resin sheet 6 on the reinforcing fiber sheet 2 impregnated with 3, after the adhesive resin 3 is sufficiently cured, the reinforced portion is completely converted to FRP, and sufficient reinforcement is provided for a long period of time. It was found to have the ability.
[0020]
In the above embodiment, the case where the concrete column reinforcing method of the present embodiment is applied to the base end of the concrete column 1 has been described, but the present invention is not limited to this. It is. The concrete column 1 does not need to be circular, but may be of any shape.
[0021]
【The invention's effect】
As described above, according to the present invention, an adhesive resin is applied to the outer peripheral surface of a concrete columnar body, and a reinforcing fiber sheet having a large tensile strength is attached and adhered on the adhesive resin, and the adhesive resin is reinforced. Before impregnating the fiber sheet and curing the adhesive resin, the adhesive resin is further coated on the reinforcing fiber sheet and a sheet for preventing sticking is attached. The impregnation of the resin can be ensured, the working time can be substantially shortened substantially, the working efficiency and economy can be improved, and sufficient reinforcement performance over a long period of time can be obtained. Is complete.
[0022]
According to the present invention, the sheet for preventing sticking is formed of a synthetic resin having irregularities on its surface, and has a function of preventing ultraviolet transmission, so that it can accurately stick to a concrete column. Even if a piece of paper or the like is pasted, it is immediately peeled off, and ultraviolet light transmission can be properly prevented, and a long-term reinforcing effect can be obtained.
[Brief description of the drawings]
FIG. 1 is a view for explaining a concrete column reinforcing method according to an embodiment of the present invention.
FIG. 2 is a view for explaining a conventional method of reinforcing a concrete column.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concrete pillar 2 Reinforcement fiber sheet 3 Adhesive resin 6 Synthetic resin sheet

Claims (3)

An adhesive resin is applied to the outer peripheral surface of the concrete columnar body, and a reinforcing fiber sheet having a large tensile strength is attached and adhered on the applied adhesive resin before curing , and the adhesive resin is impregnated into the reinforcing fiber sheet . By leaching the adhesive resin on the surface of the reinforcing fiber sheet ,
Furthermore , before curing the leached adhesive resin, the adhesive resin is overcoated from above the reinforcing sheet, to further ensure the impregnation of the adhesive resin into the reinforcing fiber sheet,
Before the adhesive resin is cured, a sheet for preventing sticking is pasted on the reinforcing fiber sheet, whereby the reinforcement of the concrete columnar body is completed within the curing time of the adhesive resin. A method for reinforcing a concrete column. The concrete columnar body reinforcing method according to claim 1, wherein the reinforcing fiber sheet is formed of an aromatic polyaramid fiber. The method for reinforcing a concrete columnar body according to claim 1, wherein the sheet for preventing sticking is formed of a synthetic resin having irregularities on its surface and also has a function of preventing ultraviolet transmission.

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