JPH06288101A - Repair method and device for concrete structure - Google Patents

Abstract

PURPOSE:To make the repair work of concrete structure easily and securely and to facilitate execution management at site. CONSTITUTION:A thermoplastic resin is mixed with reinforcement fiber which is wound on a concrete structure, and the fiber is woven in a long cloth form. The it is wound on the concrete structure 6 while dissolving the thermoplastic resin by heating both surfaces of the reinforcement fiber formed in the long cloth 4 shape. A pair of rollers 8 rotated in contact with respective front and rear surfaces of the long cloth 4 are provided, and a heating device 7 is installed inside the rollers 8. Thereby, the resin coating operation is eliminated, the temperature control of the dissolved resin is not required, contamination by resin is eliminated, workability is increased, operation can be made while confirming the dissolution and impregnation of thermoplastic resin on the sticking surface side, and also the dissolution of the thermoplastic resin and forced application of the reinforcement fiber can be made simultaneously by heating both front and rear surfaces of the long cloth 4 by the pair of rollers 8 provided with the heating device 7 therein.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, when reinforcing existing concrete structures as described above, the corners of polyamide fibers, carbon fibers or glass fibers having a relatively small fineness, for example, the amount of fibers in one direction is about 8,000 denier per 1 cm width. Reinforcing method by stacking multiple layers of stencil sheets on a concrete structure to be reinforced with resin, or wrapping around a concrete structure while impregnating resin with a yarn of thousands of denier of carbon fiber or glass fiber Is being carried out. The reason for impregnating the resin is to prevent the reinforcing fibers from being displaced after reinforcement and to impart rigidity.

[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.

In order to avoid such inconvenience and troublesomeness, the applicant of the present invention mixes a reinforcing fiber with a thermoplastic resin, winds it around a concrete structure, and melts the thermoplastic resin by heating. An attempt was made to repair the fiber by impregnating it into the reinforcing fiber and curing it.However, if the heating is performed from the outside of the reinforcing fiber wrapped with a trowel or hot air, heat can be sufficiently transmitted to the inside, that is, the concrete structure side. It was relatively difficult, and it was difficult to confirm whether the molten resin was impregnated inside.

It is an object of the present invention to provide a method of repairing a concrete structure that can be carried out easily and surely, and which allows easy construction management on site, and an apparatus suitable for the method. It is a thing.

[0006]

According to the present invention, in a method of winding a reinforcing fiber around a concrete structure to reinforce it, a thermoplastic resin such as polyethylene or vinylon is mixed with the reinforcing fiber to obtain a long fiber. By knitting in a cloth shape, by heating both sides of the long cloth-shaped reinforcing fiber and winding the thermoplastic resin while winding it around a concrete structure,
It was designed to achieve one of the above purposes. The reinforcing fiber, it is possible to use a high-strength fiber such as polyamide fiber, glass fiber or carbon fiber, the thermoplastic resin, the reinforcing fiber may be coated with a thermoplastic resin,
Alternatively, thermoplastic resin fibers may be mixed with the reinforcing fibers. Another purpose of the above is to provide a pair of rollers that rotate by coming into contact with both front and back surfaces of a long cloth woven and woven by mixing a reinforcing resin with a thermoplastic resin, and providing a heating device inside each roller. Achieved by

[0007]

[Function] A long cloth-like reinforcing fiber mixed with a thermoplastic resin is wound around a concrete structure to perform the reinforcing work. At the time of winding, both surfaces of one end side of the long cloth-like reinforcing fiber are wound. The thermoplastic fibers are heated and melted, and the melted portions are sequentially pressed to the structure. Since the reinforcing fiber cloth is heated from both sides thereof, the thermoplastic resin mixed therein is sufficiently dissolved and impregnated between the reinforcing fibers, so that the impregnation on the surface to be crimped is prevented. You can perform winding work while checking. For this work, it is not necessary to handle the molten resin, workability is good, and construction management is simple. In addition, for this heating, if a device comprising a pair of rollers equipped with a heating device inside which rotates by contacting both the front and back surfaces of the reinforcing fiber cloth is used, the thermoplastic resin of the reinforcing fiber cloth It is possible to easily wind and crimp the structure while melting it sequentially.

[0008]

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 higher tensile strength than concrete such as polyamide fiber, carbon fiber or glass fiber, and the reinforcing fiber 1 is made of a thermoplastic resin fiber 2 such as polyethylene or vinylon. The fibers were mixed and aligned, and a plurality of them were bundled into a fiber bundle 3 of about 50,000 denier. Eight bundles of this fiber bundle 3 are prepared and woven into a flat braid,
It was a long cloth-like shape 4. Instead of mixing the fibers 2 of the thermoplastic resin, as shown in FIG. 2, a coating 5 of the thermoplastic resin is applied to the peripheral surface of the reinforcing fiber 1 and the fiber bundle of the reinforcing fiber 1 is long. It may be knitted into a cloth. Also,
It is also possible to knit the fiber bundle 3 by plain weaving or the like to form a long cloth. When knitting with a plain weave, the reinforcing fibers 1 are arranged in the length direction, and the fibers 2 of the thermoplastic resin can be arranged in the width direction because they contribute little to the reinforcing effect.

As shown in FIG. 3, the long cloth-like reinforcing fiber 1 is wound around a concrete structure 6 to be used for reinforcement thereof. To heat both sides of the cloth-like material 4 by passing it between a pair of rollers 8 provided with a heating device 7 such as a nichrome wire.
As a result, the reinforcing fibers 1 are sequentially crimped onto the concrete structure 6 while melting the thermoplastic resin fibers 2,
When the melted thermoplastic resin permeates into the reinforcing fiber 1 and hardens, the concrete structure 6 has rigidity and does not shift its position, and the stress applied to the concrete structure 6 is shared by the reinforcing fiber 1. To be done. The melted state of the fibers 2 of the thermoplastic resin and the impregnated state of the reinforcing fibers 1 on the sticking surface side of the structure 6 can be confirmed when passing the heated roller 8.

These rollers 8 and 8 are rotatably attached to an arm 9 which is branched into a fork shape of a handle 10 and are supplied with power to a heat generating device 7 in each roller 8 through a power cord 11.

Explaining a concrete example of the present invention, 8 bundles of fiber bundles 3 in which fibers 2 of thermoplastic resin of polyethylene are mixed with reinforcing fibers 1 of polyamide fiber at a ratio of 1: 1 are used as a flat braid. It was knitted and woven, and both surfaces thereof were pressed against the surface of the concrete structure 6 while passing between the rollers 8 of the apparatus of FIG. The melting temperature difference between the polyamide fiber and polyethylene is 150 ° C., and the temperature of the rollers 8 is 150
Controlled to ° C. While passing between the rollers 8 and 8, the thermoplastic resin fibers 2 are melted and impregnated between the reinforcing fibers 1, and when one roller 8 is moved while being pressed against the surface of the structure 6, reinforcement is obtained. Fiber 1 for bonding was sequentially adhered to the surface. When the melted thermoplastic resin fiber 2 was cured, the reinforcing fibers 1 were integrated and the FRP structure was formed on the surface of the structure 6. The time required for this operation was 2 hours, and in the conventional method in which a sheet impregnated with a resin was applied to the concrete structure while being laminated and reinforced, the application operation required 3 hours.

[0012]

As described above, according to the present invention, a reinforcing fiber for wrapping around a concrete structure and reinforcing it is mixed with a thermoplastic resin such as polyamide or vinylon and knitted into a long cloth shape. Then, both sides of the long cloth-like reinforcing fiber are heated and wound around the concrete structure while melting the thermoplastic resin, so that the reinforcing work can be performed without applying the resin, and the molten resin There is no need to control the temperature, there is no stickiness and stains on the resin, workability is improved, and there is an effect that the thermoplastic resin on the adhesive surface side can be sufficiently dissolved and the work can be performed while confirming the impregnation. By heating both the front and back surfaces of the long fiber of the reinforcing fiber with a pair of rollers equipped with a heat generating device inside, the thermoplastic resin on both surfaces can be melted and the reinforcing fiber can be pressure bonded at the same time for reinforcement work. Efficiently The effect of such as that carried out to obtain.

[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 cross-sectional view of another structure of the reinforcing fiber used for carrying out the present invention.

FIG. 3 is a perspective view of an embodiment of the method of the present invention.

FIG. 4 is an illustration of the apparatus used to carry out the method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Reinforcing fiber 2 Thermoplastic resin fiber 4 Cloth 5 Thermoplastic resin coating 6 Concrete structure 7 Heat generating device 8 Roller

Claims (6)

[Claims] 1. A method for winding a reinforcing fiber around a concrete structure to reinforce it, wherein a thermoplastic resin such as polyethylene or vinylon is mixed into the reinforcing fiber and knitted into a long cloth shape. A method for repairing a concrete structure, characterized in that both sides of the long cloth-shaped reinforcing fiber are heated and the thermoplastic resin is melted and wound around the concrete structure. 2. The method for repairing a concrete structure according to claim 1, wherein high-strength fibers such as polyamide fibers, glass fibers and carbon fibers are used as the reinforcing fibers. 3. The thermoplastic resin is mixed by coating the reinforcing fiber with a thermoplastic resin or by mixing the reinforcing fiber with a thermoplastic resin fiber. A method for repairing the concrete structure described. 4. The method for repairing a concrete structure according to claim 1, wherein the reinforcing fiber is made of plain weave or braided weave. 5. When the reinforcing fiber is knitted into a long cloth by plain weaving, high strength fiber such as polyamide fiber is used as the fiber in the length direction and thermoplastic resin fiber is used as the fiber in the width direction. The method for repairing a concrete structure according to claim 1, wherein: 6. A pair of rollers that rotate by contacting both the front and back sides of a long cloth woven and woven by mixing a reinforcing fiber with a thermoplastic resin, and a heating device is provided inside each roller. Equipment for repairing concrete structures.