JP3636748B2 - Structure reinforcement method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement in a method for reinforcing a large structure such as a concrete structure with a fiber reinforced plastic.
[0002]
[Prior art]
Various materials have been proposed as materials for reinforcing structures with fiber reinforced plastics.
Typical examples of these materials are woven fabrics or unidirectional materials made of high-strength fibers such as glass fibers, carbon fibers, and aramid fibers, and conventional reinforcing techniques are applied to these materials at the construction site using polyester or epoxy resin. This was a construction method in which a reinforcing material was applied to a structure while impregnating a resin that hardens at room temperature, such as an on-site impregnation construction method.
[0003]
[Problems to be solved by the invention]
However, in the conventional on-site impregnation method, it takes a long time to impregnate the reinforcing material with the resin, the upward work is often performed during construction, the impregnation work is difficult, and the working environment is poor. And there was a problem of requiring a large amount of expenses.
The present invention provides a method capable of solving such a conventional problem and reinforcing a structure easily and inexpensively in a short time.
[0004]
[Means for Solving the Problems]
In the present invention, a prepreg A impregnated with a matrix resin A and a prepreg B impregnated with a matrix resin B that is cured by contact with the matrix resin A are attached to a structure so that both layers overlap each other. A method for reinforcing a structure characterized by forming a gist of the first invention,
[0005]
After applying primer resin C that is cured alone at room temperature to the structure, both prepreg A impregnated with matrix resin A and prepreg B impregnated with matrix resin B that comes into contact with matrix resin A to cure The reinforcing method of the structure, which is characterized in that the reinforcing layer is formed by pasting so as to overlap each other, the gist of the second invention,
[0006]
In the said invention, it is preferable to apply | coat resin hardened | cured at room temperature to the outermost layer surface of a reinforcement layer.
[0007]
The present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an example of the reinforcing method of the present invention. In FIG. 1, (1) is a structure such as a concrete structure, and the matrix resin A is reinforced on the surface. Affixing the prepreg A (2) impregnated on the fiber sheet, and then affixing the prepreg B (3) impregnated on the reinforcing fiber sheet with the matrix resin B, which is cured by contact with the matrix resin A, Curing of the matrix resins A and B is started from the interface between the prepreg A and the prepreg B, and the structure (1) and the reinforcing material (prepregs A and B) are integrated by the cured matrix resin. In the present invention, the number of prepregs A and B to be attached is not limited.
[0008]
In the reinforcing structure shown in FIG. 1, the interface between the structure (1) and the prepreg A (2) is the most important interface from the viewpoint of reinforcement, and the hardening of the matrix resin A (2). In the case of upward sticking, depending on the amount of the prepregs A (2) and B (3) stacked, there is a risk of dropping during construction. In such a case, as shown in FIG. 2, a primer resin C (4) is interposed between the structure (1) and the prepreg A (2), and the structure (1) and the prepreg A (2) It is preferable to increase the adhesive strength. Furthermore, the outermost layer surface of the reinforcing layer is farthest from the interface where curing begins, and it may take a considerable amount of time for the surface to cure. In such a case, the outermost layer surface is cured at room temperature. When the possible resin D is applied, the stickiness of the surface is eliminated in a short time.
[0009]
Next, the reinforcing fiber sheet, matrix resins A and B, and primer resin C used in the reinforcing structure will be described in detail.
The reinforcing fiber sheet impregnated with the matrix resins A and B is a woven fabric or a unidirectional sheet material made of high-strength fibers such as glass fibers, carbon fibers, and aramid fibers. The configuration is not particularly limited.
Further, for example, when the reinforcing level is sufficient for the amount of reinforcing fibers constituting the prepreg A, the fiber material constituting the prepreg B is a material that does not contribute to reinforcement (for example, porous paper or fiber mat) and is simply a matrix resin B. It may be a material that supports or may be applied only by applying the matrix resin B.
[0010]
The matrix resins A and B used in the present invention are resins that are cured by contact with each other. As such a resin, a catalyst curable resin system is preferable, and a radical polymerization system is preferable from the viewpoint of reaction rate. As a specific combination of matrix resins A and B, a resin obtained by adding an accelerator such as cobalt naphthenate to a resin obtained by adding an unsaturated polyester or vinyl ester resin or the like and a curing catalyst such as peroxide to the same main agent. Examples thereof include combinations or commercially available two-component mixed adhesives such as Hard Rock manufactured by Denki Kagaku Kogyo Co., Ltd.
[0011]
As the primer resin C, a resin that is cured by contact with the matrix resin or a resin that is cured alone at room temperature regardless of the matrix resin is used.
When the primer resin C is a resin that is cured by contact with the matrix resin, the primer resin C can be applied directly to the structure or used as a prepreg sheet supported on a sufficiently thin fiber sheet. In the case where the primer resin C is a resin that is curable alone at normal temperature, the primer resin C is applied directly to the structure and applied, but it should not inhibit the curing of the matrix resin. The primer resin C satisfying such conditions may be the same resin as the matrix resin, or may be a polyester or epoxy resin that cures at room temperature.
[0012]
In addition, the resin applied to the outermost layer of the reinforcing layer is not particularly limited as long as it is a resin that cures at room temperature, and is applied by directly applying the entire prepreg to the surface of the outermost layer after lamination. It must not inhibit the hardening of B.
[0013]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0014]
[Example 1]
Hard Rock E-510K (Electrochemical Industry Co., Ltd.) with a resin content of 50% on a unidirectional sheet of 300 g / m ² in which 0.8 g of carbon fiber per meter is aligned and partially fixed with glass fiber in the weft direction. Prepreg A impregnated with agent A) and prepreg B impregnated with agent B were prepared. A concrete mortar board was used as the structure, and after smoothing the surface, the following two types of reinforcement work were performed.
(1) First, prepreg A was pasted on a mortar plate, then prepreg B and further prepreg A were pasted, and then the whole was sealed with a nylon film and deaerated.
(2) Hardlock E-510K B agent (corresponding to primer resin C) was applied to the mortar plate with a sponge roller, prepreg A was then applied, and deaeration was performed in the same manner as in (1) above.
In these constructions, the pasting work was completed in a short time, and the workability was far superior to the conventional on-site impregnation method. Moreover, the start of hardening was recognized by the lamination | stacking interface of the prepreg in about 10 minutes, and the whole hardened | cured in 4 days.
[0015]
[Example 2]
The carbon fiber unidirectional sheet used in Example 1 was added with prepreg A obtained by impregnating a matrix resin A in which a peroxide was mixed with epoxy acrylate at a resin content of 50%, and cobalt naphthenate was added to the epoxy acrylate. A prepreg B obtained by impregnating the matrix resin B with a resin content of 50% was produced. After using a concrete mortar board as a structure and smoothing the surface, the following two types of reinforcement work were performed.
(1) A resin (corresponding to the primer resin C) that is singly cured at room temperature mixed with Araldite LY5052 / HY5052 = 100/38 manufactured by Ciba Geigy Co., Ltd. is applied to the mortar plate with a sponge roller, and then prepreg A, prepreg B, prepreg Three sheets were pasted in the order of A.
(2) Apply a resin mixed in matrix resin A / matrix resin B = 1/1 (corresponding to primer resin C) to the mortar plate with a sponge roller, and then paste three prepreg A, prepreg B, and prepreg A in this order. It was.
After performing the above two types of construction, the surface was covered with a nylon film, degassed, and the resin was cured. Also in this example, workability was remarkably superior to the conventional construction method, and the whole was cured in 5 days.
[0016]
[Example 3]
After performing the same reinforcement work as in Example 2 (1), when the same resin as the resin used as the primer resin C was applied as the resin D to the outermost surface of the reinforcing layer, the outermost surface was within 1 hour. I'm not sticky.
[0017]
【The invention's effect】
According to the present invention configured as described above, there is an excellent effect that the structure can be reinforced easily and inexpensively in a short time.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a reinforcing method of the present invention.
2 is an explanatory view showing an example in which a primer resin C is applied to the surface of a structure in the reinforcing method of FIG. 1;
3 is an explanatory view showing an example in which a resin D that cures at room temperature is applied to the outermost surface of a reinforcing layer in the reinforcing method of FIG. 2; FIG.
[Explanation of symbols]
1 Structure 2 Prepreg A
3 Prepreg B
4 Primer resin C
5 Resin D

Claims (3)

  A prepreg A impregnated with a matrix resin A and a prepreg B impregnated with a matrix resin B that comes into contact with the matrix resin A and are bonded to the structure so as to overlap each other to form a reinforcing layer. Reinforcing method of structure.   After applying primer resin C that is cured alone at room temperature to the structure, both prepreg A impregnated with matrix resin A and prepreg B impregnated with matrix resin B that comes into contact with matrix resin A to cure A method for reinforcing a structure, characterized in that the reinforcing layer is formed by being attached so as to overlap. The method for reinforcing a structure according to claim 1 or 2, wherein a resin that cures at room temperature is applied to the outermost surface of the reinforcing layer.

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