JPH06288102A - Repair material for concrete structure - Google Patents

Abstract

PURPOSE:To simplify repair work for concrete structure, and also facilitate execution management at site. CONSTITUTION:In a repair material 3 with which reinforcement fiber 1 is woven to be wound on a concrete structure 4 to repair it, the repair material is woven with the reinforcement fiber on which a thermoplastic resin 2 is applied as coating. Thereby, operation to impregnate resin when fiber is wound on the concrete structure is not required, and winding work becomes easier. Also, because no dissolved resin is used, execution management is simplified, and contamination at site is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair material used for repairing concrete beams and columns, concrete structures such as bridge piers and chimneys.

[0002]

2. Description of the Related Art Conventionally, when repairing an existing concrete structure as described above, a rectangular sheet of carbon fiber or glass fiber having a relatively small fineness, for example, a fiber amount in one direction of about 8,000 denier per 1 cm width is used. A repairing method in which multiple layers of resin are used to bond the repair material to the concrete structure to be repaired, and a thousands of denier yarns of carbon fiber or glass fiber are impregnated with the resin and wound around the concrete structure. A method of repair is being implemented. The reason why the repair material is impregnated with the resin is to prevent the repair fibers such as carbon fibers from being displaced after the repair and to impart rigidity to the repair material as a whole to enhance strength efficiency.

[0003]

In the method of sticking the rectangular sheet, the steps of sticking the sheet and applying the resin have to be repeated many times, and since the molten resin is handled on site, the resin Since it is necessary to manage the construction such as temperature, there is a problem that workability is poor because the resin is sticky and there is stain by the resin.Since the fibers of each sheet are not used continuously, the fiber strength at the overlapping part Must be transmitted by the adhesive force of the resin, and the fiber usage efficiency is poor. Further, even when the above yarn is wound, the workability is poor and the construction management is troublesome due to the repetition of the work of impregnating and sticking the resin.

An object of the present invention is to provide a repair material which can simplify the repair work of a concrete structure and facilitate the construction management on site.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a repair material in which a reinforcing fiber wound around the concrete structure is woven for reinforcement, and the repair material is coated with a thermoplastic resin. The above object was achieved by knitting with fibers. It is convenient to use a high-strength fiber such as glass fiber, carbon fiber or aromatic polyamide fiber as the reinforcing fiber, and to coat the high-strength fiber with a thermoplastic resin such as polyethylene or vinylon. It is possible to make a long string by plain weaving or braiding of high-strength fibers coated with a thermoplastic resin.

[0006]

The repair material of the present invention is obtained by weaving reinforcing fibers such as aromatic polyamide fibers coated with a thermoplastic resin, and is wound around a concrete structure to be repaired, and then the repair material. When heated, the thermoplastic resin coated on the reinforcing fibers is melted to connect the reinforcing fibers, and after solidification, it has a FRP structure and has rigidity, and can be fixed on the structure so as not to be displaced. . Therefore, the work of winding the repair material can be performed in a dry state, and it is not necessary to handle the molten resin, and workability and construction management are simplified.

[0007]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a reinforcing fiber having a high tensile strength such as an aromatic polyamide fiber, a carbon fiber or a glass fiber, and a thermoplastic resin 2 such as polyethylene or vinylon is provided on the peripheral surface of the reinforcing fiber 1. Apply coating. The reinforcing fiber 1 has a diameter of about 12 μm, and a plurality of bundles of the reinforcing fibers 1 are prepared as shown in FIG. 2, for example, 8 bundles are prepared, and the fineness is increased to about 500,000 denier or more and knitted into a braid. The material for repair 3 was used.

Since the repair material 3 is an aggregate of fibers, it is relatively flexible and can be easily wound around a concrete structure 4 such as a pillar as shown in FIG. Then, when the wound repair material 3 is heated with a heated iron, a hot air heater, or the like, the thermoplastic resin 2 is melted and the reinforcing fibers 1 are connected to each other. It becomes the FRP structure that is integrated. In this case, the heating temperature is controlled so that the reinforcing fiber 1 is not damaged and the thermoplastic resin 2 is melted. The difference in melting temperature between the reinforcing fiber 1 and the thermoplastic resin 2 is preferably about 100 ° C. or more, and when the reinforcing fiber 1 is an aromatic polyamide fiber, the temperature at which strength is reduced is 300 ° C. For the thermoplastic resin 2, it is preferable to use polyethylene, polyester, or vinylon that melts at 150 ° C. The reinforcing fiber 1 coated with the thermoplastic resin 2 may be knitted or woven into a long cloth shape or a wide string shape.

[0009]

As described above, according to the present invention, since the material for repairing the concrete structure is made by weaving the reinforcing fibers coated with the thermoplastic resin, it is possible to use the resin when winding it around the concrete structure. Since the work of impregnating the resin is not required, the winding work is simplified, and since the melted resin is not handled, the construction management is simplified, and there is an effect that the on-site dirt is eliminated.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a structure of a reinforcing fiber used for carrying out the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a perspective view showing an example of repair using the repair material of the present invention.

[Explanation of symbols]

 1 Reinforcing Fiber 2 Thermoplastic Resin 3 Repair Material 4 Concrete Structure

Claims (3)

[Claims] 1. A repair material in which reinforcing fibers to be wound around for repairing a concrete structure are knitted and woven, and the repair material is knitted with reinforcing fibers coated with a thermoplastic resin. A material for repairing concrete structures. 2. The reinforcing fiber is made of high strength fiber such as glass fiber, carbon fiber or aromatic polyamide fiber, and the high strength fiber is coated with a thermoplastic resin such as polyethylene or vinylon. The material for repairing a concrete structure according to claim 1. 3. The repair of a concrete structure according to claim 1, wherein high-strength fibers coated with a thermoplastic resin as the repair material are formed into a long string shape by plain weaving or braid weaving. Materials.