JPH03224901A - Reinforcement of structure - Google Patents

Abstract

PURPOSE:To increase a reinforcing workability at a reinforcing site, by infiltrate an indoor-setting matrix resin in a reinforced fiber to form a reinforced fiber sheet arranged in one direction and utilizing it as a reinforcing material for structures. CONSTITUTION:A single directional reinforced fiber sheet 1 is made of a supporting sheet 2, an adhesives layer 3, and reinforced fibers 4. The thickness of the sheet 2 is formed to be about 5-100mum by use of scrim cloth or the like and a matrix resin is impregnated from the sheet 2 side in the reinforced fiber 4 and the thickness of the adhesives layer 3 is formed to be about 10-30mum by use of the same adhesives as the matrix resin. And further, a plurality of bandled fibers are used as filaments for the reinforced fibers. Next, a setting type resin is applied on reinforced positions and the fiber sheet 1 is applied on it. In this way, a reinforcing workability at site can be increased.

Description

[Detailed Description of the Invention] (1) When reinforcing structures such as bridges and elevated roads using fiber-reinforced plastics, the present invention enables the reinforcement to be carried out easily at the reinforcement site and improves the reinforcement strength. This paper relates to a method for reinforcing structures that makes it possible to

Bridge piers such as bridges and elevated roads are being reinforced with fiber-reinforced plastics.

Conventional methods for reinforcing it are: (1) pasting hardened fiber-reinforced plastic on the reinforced parts of the piers; (2) pasting prepreg on the reinforced parts of the piers to prevent deformation during heat curing. (3) Wrap a reinforcing fiber cloth around the reinforced part of the pier and impregnate it with a room-temperature curing matrix resin to create a fiber-reinforced plastic. A known method is to create a fiber-reinforced plastic by leaving it to harden after winding.

However, although the method (1) above has good reinforcement efficiency, it has a major drawback in that it cannot be applied to curved reinforcement locations.

Method (2) has the drawback that the prepreg attached to the reinforced portion of the pier must be heat-cured on site, and the heat-cure process is not easy.

In method (3), the reinforcing fibers are used in a cross pattern such as plain weave or twill weave, so the strength of the reinforcing fibers is weak at the point where the warp and weft intersect. It has the disadvantage that a sufficient reinforcing effect cannot be obtained.

In addition to the above, another method has been considered in which reinforcing fiber threads impregnated with resin are wound on-site at the reinforcement points of bridge piers using the filament winding method, and then hardened to form fiber-reinforced plastic, but this method is limited in terms of what can be reinforced. However, it has drawbacks such as high equipment cost, making it impractical.

Therefore, in view of the above-mentioned current situation, an object of the present invention is to make it possible to perform reinforcement with good ease of implementation at the reinforcement site and to improve reinforcement strength when reinforcing structures such as bridges and elevated roads using fiber-reinforced plastics. The purpose of the present invention is to provide a method for reinforcing structures that makes it possible to

・The above-mentioned objective for achieving the following is achieved by the method for reinforcing a structure according to the present invention. In summary, the present invention provides the following advantages:
The reinforcing fibers of a unidirectionally arranged reinforcing fiber sheet are provided on a support sheet with reinforcing fibers arranged in one direction, and the reinforcing fibers are impregnated with a room temperature curable matrix resin, and the fiber sheet is pasted, and then the matrix is This is a method for reinforcing a structure, which is characterized by curing a resin.

According to another aspect of the present invention, a unidirectionally arranged reinforcing fiber sheet is provided, in which a room temperature curing matrix resin is applied to the surface of the reinforced portion of the structure, and reinforcing fibers are arranged in one direction on a support sheet. The reinforcing fibers are applied to the surface and impregnated with the resin, and then the matrix resin is cured.

According to still another aspect of the present invention, a unidirectionally arranged reinforcing fiber sheet in which reinforcing fibers are arranged in one direction on a resin-permeable support sheet is attached to the surface of the reinforced portion of the structure, and then A room temperature curable matrix resin is permeated from the sheet side to impregnate the reinforcing fibers, and then the matrix resin is cured.

Emperor Shito Examples of the present invention will be described below.

FIG. 1 is a sectional view showing an example of a unidirectionally aligned reinforcing fiber sheet used in the method for reinforcing a structure of the present invention.

The above-mentioned unidirectionally arranged reinforcing fiber sheet 1 has a support sheet 2
An adhesive layer 3 is provided on top, and reinforcing fibers 4 are arranged and bonded in one direction on the sheet 2 via the adhesive layer 3. In the reinforcing method of the present invention, this reinforcing fiber sheet 1 is used. The reinforcing fibers 4 are impregnated with a room-temperature curing matrix resin and used for reinforcement at reinforcement sites such as bridges and elevated roads.

The support sheet 2 is made of scrim cloth, glass cloth, release paper, nylon film, etc.
When the sheet 2 is made of the above-mentioned scrim cloth, glass cloth, etc., the matrix resin can be impregnated into the reinforcing fibers 4 from the sheet 2 side. The thickness of the support sheet 2 is about 1 to 500 μm, preferably about 5 to 100 μm, from the viewpoint of having flexibility and strength enough to support the reinforcing fibers 4.

In principle, the adhesive forming the adhesive layer 3 may be any adhesive as long as it can at least temporarily bond the reinforcing fibers 4 onto the support sheet 2; It is preferable to apply this to the adhesive layer 3 as well, so it is preferable to use a resin with good compatibility with the matrix resin as the adhesive. For example, when using an epoxy resin as the matrix resin, epoxy adhesive It is recommended to use an agent. Adhesive layer 3
The thickness of the reinforcing fibers 4 is approximately 10 to 30 μm since it is sufficient to temporarily bond the reinforcing fibers 4 thereto.

The reinforcing fibers 4 are slightly separated by arranging a large number of converged fiber bundles as filaments or lightly twisted and converging fiber bundles on the adhesive layer 3 and crushing them from above, whereby the reinforcing fibers 4 are laminated in multiple layers by bonding using a sizing agent or twisting, and are adhered to the support sheet 2 through the adhesive layer 3 in a unidirectional arrangement,
In this way, the desired reinforcing fiber sheet 1 is obtained.

In this case, the plurality of layers of reinforcing fibers 4 are made by arranging the fiber bundles 4A densely in one direction on the support sheet 2 via the adhesive layer 3, as shown in FIG. 2(a). By crushing from above, the lower part of the fiber bundle 4A was adhered to the adhesive layer 3, and as shown in FIG. thing or third
As shown in Figure (a), by arranging the fiber bundles 4A in one direction with an interval in the lateral direction on the support sheet 2 via the adhesive layer 3, and crushing the fiber bundles 4A from above in the same way. The lower part of the fiber bundle 4A is adhered to the adhesive layer 3, and the fiber bundle 4A is bonded to the adhesive layer 3 as shown in FIG.
As shown in FIG. 2, the support sheet 2 may be provided sparsely at intervals laterally on the support sheet 2.

The fiber bundle 4A can be used either with or without opening the fibers 4, that is, the filaments 4, and the degree of crushing of the fiber bundle 4A is determined by this, so that the fibers of the arranged plural layers can be used. It depends on the layer thickness you want to obtain for layer 4, but in the case of carbon fibers, when a carbon fiber bundle is made of about 12,000 carbon fiber filaments with a diameter of 5 to 15 μm, the width in the lateral direction is about 5 mm. An example is to crush the object so that it becomes .

The unidirectionally aligned reinforcing fiber sheet 1 as described above can be manufactured, for example, as shown in FIG. 4.

That is, after applying adhesive on the support sheet 2 supplied from the sheet supply roll 6 using the adhesive application roll 7 to form the adhesive layer 3, the sheet 2 is transferred to a pair of pressure rollers 8a and 8b.
At the same time, the fiber bundles 4A of the reinforcing fibers 4 and the release paper 9 from the release paper roll 10 are fed into the pressure unit 8, and the fibers are applied to the adhesive layer 3 on the sheet 2. The bundles 4A are arranged in one direction, and the release paper 9 is placed on top of them. In this state, pressure is applied using pressure rollers 8a, 8b and a support plate (not shown) to crush the fiber bundle 4A, and at the same time, the reinforcing fibers 4, which are slightly separated, are placed on the sheet 2 via the adhesive layer 3. Glue to. Thereafter, the release paper 9 is wound up with a release paper take-up roll 11, and if necessary, the cover film 13 supplied from the film supply roll 12 is placed over the reinforcing fibers 4 on the sheet 2. A unidirectional reinforced fiber sheet 1 is obtained by arranging and bonding reinforcing fibers 4 in one direction via an adhesive layer 3. The obtained sheet 1 is wound onto a sheet winding roll 14.

In the present invention, as described above, the reinforcing fiber sheet 1 is used for reinforcement at reinforcement sites such as bridges and elevated roads by impregnating the reinforcing fibers 4 with a room temperature curing matrix resin. An epoxy resin or the like is used in which the curing agent is adjusted so that it hardens at room temperature.

According to the invention, the reinforcement of the construction is carried out as follows.

That is, in one embodiment of the present invention, at the site of reinforcing structures such as bridges and piers of elevated roads, the reinforcing fibers 4 on the unidirectionally arranged reinforcing fiber sheet 1 are coated at room temperature using an appropriate application means such as a roller, a brush, or a sprayer. A curable matrix resin is applied and impregnated, and as shown in FIG. 5, the sheet 1 is pasted around the reinforced portion 15 with the reinforcing fiber 4 side facing the reinforced portion 15 of the structure, and the desired number of sheets are laminated. do. Next, after impregnating the matrix resin with a hand tool or the like, cover it by wrapping a pressure tape on top of it, leave it as it is, let the matrix resin harden, and convert the sheet 1 into a fiber-reinforced plastic. Just do it. As a result, the structure is reinforced with fiber-reinforced plastic.

In another embodiment of the present invention, as shown in FIG. 6, a room-temperature curing matrix resin 18 is applied around the reinforced portion 15 to a thickness of, for example, about 100 μm, and then the reinforcing fiber 4 side is applied to the reinforced portion 15. Unidirectionally aligned reinforced fiber sheet as side 1
A desired number of the reinforcing fibers 4 are laminated and pressed together to attach the sheet 1, and at the same time, the reinforcing fibers 4 are impregnated with the matrix resin 18. In this case, the first laminated sheet 1
Each time the next sheet 1 is laminated on top, the support sheet 2 of the previous sheet 1 may be further coated with matrix resin.

Thereafter, in the same manner as described above, cover the sheet 1 by winding a pressure tape, etc., and then leave it as it is to harden the matrix resin, thereby making the sheet 1 a fiber-reinforced plastic. In this way, the structure is also reinforced with fiber-reinforced plastic.

In yet another embodiment of the present invention, the unidirectionally aligned reinforcing fiber sheet 1 is one in which the support sheet 2 is permeable to a resin. As shown in FIG. 7, first, a resin similar to the matrix resin is applied as a primer 16 on the surrounding surface of the reinforced portion 15, and the sheet 1 is pasted on top of it to laminate the desired number of sheets, and then the outermost layer is A room-temperature curing matrix resin 17 is applied onto the support sheet 2 of the sheet 1 using a roller or the like and permeated through the sheet 2.
is impregnated into the reinforcing fibers 4. Thereafter, in the same manner as described above, cover the sheet 1 by winding a pressure tape, etc., and then leave it as it is to harden the matrix resin 17, thereby making the sheet 1 a fiber-reinforced plastic.

In this way, the structure is also reinforced with fiber-reinforced plastic.

In each of the above examples, the reinforcing fiber sheet 1 was pasted and laminated with the reinforcing fiber 4 side facing the reinforced part 15 side, but the reinforcing fiber sheet 1 was pasted and laminated with the support sheet 2 side facing the reinforced part 15 side. You can.

The reinforcing method of the present invention is configured as described above.

According to this, when reinforcing structures such as bridges and elevated roads with fiber-reinforced plastic, a unidirectionally arranged reinforced fiber sheet 1 in which reinforcing fibers are arranged in one direction on a support sheet is used. , Since the reinforcing fibers 4 are impregnated with a room-temperature curing matrix resin and used at the reinforcement site, the sheet 1 impregnated with the matrix resin is used.
By pasting it around the reinforced area and leaving it as it is, the matrix resin can be cured and the sheet 1 can be made into a fiber reinforced plastic, without the troublesome work of heating and curing the matrix resin at the reinforcement site. , reinforcement with fiber-reinforced plastic can be carried out with good construction properties. Further, since the reinforcing fibers 4 are arranged in one direction, there is no decrease in the strength of the fiber-reinforced plastic unlike when the reinforcing fibers are arranged in a cross pattern, and therefore the reinforcing strength can be improved. Furthermore, since the matrix resin is cured after the sheet 1 is pasted around the reinforced area, reinforcement can be carried out even in curved reinforced areas.

As explained above, in the reinforcing method of the present invention, a unidirectionally arranged reinforcing fiber sheet in which reinforcing fibers are arranged in one direction on a support sheet is used, and the reinforcing fibers are treated with a room temperature curing type at the reinforcement site. Since the reinforcing fibers are impregnated with matrix resin and used for reinforcement, by pasting a reinforcing fiber sheet in which the reinforcing fibers are impregnated with matrix resin around the reinforced area and leaving it as it is, the matrix resin can be heated and hardened at the reinforcement site. Without such troublesome work, matrix resin can be cured to form fiber-reinforced plastic, and reinforcement can be performed with good ease of implementation. Furthermore, since the reinforcing fibers are arranged in one direction, the reinforcing strength of the resulting fiber-reinforced plastic can be improved. Further, even if the reinforced portion is curved, reinforcement can be performed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a unidirectionally aligned reinforcing fiber sheet used in the reinforcing method of the present invention. FIG. 2(a) is a sectional view showing one aspect of how the reinforcing fiber bundles are arranged in the reinforcing fiber sheet of FIG. 1. FIG. FIG. 2(b) is a cross-sectional view showing the arrangement of reinforcing fibers obtained from the fiber bundle of FIG. 2(a). FIG. 3(a) is a sectional view showing another aspect of how the fiber bundles of reinforcing fibers are arranged in the reinforcing fiber sheet of FIG. 1. FIG. 3(b) is a cross-sectional view showing the arrangement of reinforcing fibers obtained from the fiber bundle of FIG. 3(a). FIG. 4 is an explanatory diagram showing an example of a method for manufacturing the reinforcing fiber sheet shown in FIG. 1. FIG. 5 is a sectional view showing an embodiment of the reinforcing method of the present invention. FIG. 6 is a sectional view showing another embodiment of the reinforcing method of the present invention. FIG. 7 is a sectional view showing still another embodiment 5 of the reinforcing method of the present invention. A 5 6 17, Two reinforcing fiber sheets: Support sheet: Adhesive layer Two reinforcing fibers: Fiber bundle: Reinforced portion Nibrimer 18: Matrix resin 6 Figure 6 1. ``~]'1. Procedural amendment March 13, 1991

Claims (1)

[Claims] 1) A room-temperature curing matrix resin is applied to the reinforcing fibers of a unidirectionally arranged reinforcing fiber sheet in which reinforcing fibers are arranged in one direction on a support sheet on the surface of the reinforced portion of the structure. A method for reinforcing a structure, comprising impregnating the fiber sheet, pasting the fiber sheet, and then curing the matrix resin. 2) Apply a room temperature curable matrix resin to the surface of the reinforced portion of the structure, and attach a unidirectionally aligned reinforcing fiber sheet, in which reinforcing fibers are arranged in one direction, on the support sheet, to the surface. A method for reinforcing a structure, comprising impregnating reinforcing fibers with the resin and then curing the matrix resin. 3) A unidirectionally aligned reinforcing fiber sheet, in which reinforcing fibers are arranged in one direction, is pasted on the surface of the reinforced part of the structure on a resin-permeable support sheet, and then a room-temperature curing type reinforcement sheet is applied from the sheet side. A method for reinforcing a structure, comprising impregnating the reinforcing fibers with a matrix resin, and then curing the matrix resin.