JPH10121745A - Earthquake-resistant reinforcing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and rapidly reinforce a deteriorated concrete body, by fixing a reinforcing body formed by sticking a carbon fiber sheet on a steel plate, to the surface of the concrete body. SOLUTION: A carbon fiber sheet 1 are stuck on both faces of a steel plate 2 with an epoxy resin agent and a heat-resistant paint is applied on the surface of the carbon fiber sheet 1 in order to increase heat-resistant and weather proof properties to form a reinforcing body 3. Cracks brought about on a deteriorated concrete body P1 are covered with the reinforcing body 3. Anchor bolts 4 are inserted in fixing holes formed on the surface of the concrete body P1 and fixed therein. In this time, a polymer cement is put between the concrete body P1 and the reinforcing body 3 to closely fit to each other. The section of the reinforcing body 3 is formed as a L-shape or a flat plate in accordance with reinforcing positions. Accordingly, deteriorated concrete bodies can be rapidly reinforced by an extremely simple work regardless of the reinforcing positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic reinforcement method suitable for reinforcing the strength of a deteriorated concrete building.

[0002]

2. Description of the Related Art Conventionally, as a method of reinforcing a column of a concrete skeleton, there is a method of seismic reinforcement of an existing column described in Japanese Patent Publication No. 6-56061. In this reinforcing method, a corner of an existing column is covered with a covering material, and carbon fibers are wound over the covering material.

[0003] On the other hand, Japanese Patent Application Laid-Open No. 61-151371 discloses that a high-strength carbon long fiber strand is spirally wound around a column member of an existing structure, and a finishing material is applied so as to embed the long fiber strand. A method is described.

[0004]

However, since all of these conventional reinforcing methods reinforce by winding carbon fiber, the objects to be reinforced are limited to columns on which carbon fiber can be wound, and concrete foundations and the like can be used. It is an inconvenient reinforcing method to reinforce a place where it is difficult to wind the carbon fiber, such as a beam.

[0005] Since the Great Hanshin Earthquake, it has been desired to establish a reinforcing method for quickly reinforcing a deteriorated concrete skeleton. At present, reinforcement methods as shown in (1) are being implemented. That is, FIG.
This is a method of reinforcing a plain concrete foundation. In this case, a method of removing the existing foundation, inserting a new reinforcing bar, and pouring concrete to reinforce the foundation. According to such a conventional construction method, various works are required under the building structure, which requires an extremely large amount of time and labor, and unfortunately, it is not a method of rapidly reinforcing a large number of concrete bodies. It is the current situation.

Accordingly, the present invention has been made to solve the above-mentioned problems, and is an earthquake-resistant reinforcement capable of rapidly reinforcing a deteriorated concrete skeleton regardless of a reinforcing point with extremely simple work. The purpose is to provide a method.

[0007]

In order to achieve the above-mentioned object, a first means of the present invention is to provide a carbon fiber sheet 1 in which carbon fibers are arranged and bonded in one direction, and the carbon fiber sheet 1 is The purpose is to form a reinforcing member 3 by sticking to the plate surface of the steel plate 2 and to fix the reinforcing member 3 to the surface of the deteriorated concrete skeleton P to reinforce it.

[0008] The carbon fiber sheet 1 of the second means,
The heat-resistant paint is applied to the surface of the carbon fiber sheet 1 bonded to a steel plate with an epoxy resin agent.

Further, the third means is a concrete skeleton P
Is to cover the cracks that have occurred in the concrete body P with the anchor bolts 4.

The fourth means is to make the gap between the surface of the concrete skeleton P and the reinforcing body 3 adhere to each other via the polymer cement 5 as a means for solving the problem.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail.

The present invention is an earthquake-resistant reinforcing method for reinforcing a concrete skeleton P using a reinforcing member 3 in which a carbon fiber sheet 1 is adhered to a steel plate 2.

The carbon fiber sheet 1 is a sheet-like reinforcing material in which carbon fibers are arranged and bonded in one direction. This carbon fiber has ten times the tensile strength of iron. Although an epoxy resin agent is used for bonding the carbon fibers to each other, another adhesive having an adhesive strength equal to or higher than that of the epoxy resin agent may be used. Then, the carbon fiber sheet 1 and the steel plate 2 are bonded with an epoxy resin. At this time, by applying a heat resistant paint to the surface of the bonded carbon fiber sheet 1, the heat resistance and weather resistance of the reinforcing member 3 can be improved.

The reinforcing method of the present invention is to fix the reinforcing member 3 to the surface of the deteriorated concrete skeleton P (see FIG. 1). The drawing shows how to reinforce the plain foundation P1. That is, as shown in FIG. 2, a crack generated in the foundation P <b> 1 is covered with the reinforcing body 3 and fixed with the anchor bolt 4. The anchor bolt 4 may use a high tension bolt. At this time, in FIG.
By using the reinforcing body 3 having a substantially L-shaped cross section covering the vertical plane to the horizontal plane, the strength of the unstretched foundation P1 is further increased. In addition, concrete skeleton P such as beams and slabs
Depending on the reinforcing position, the reinforcing member 3 can be used in a flat plate shape. Further, the shape of the steel plate 2 constituting the shape of the reinforcing member 3 is not limited to such a shape as a substantially L-shaped cross section or a plate. Further, the reinforcing member 3 shown in FIG. 1 uses the reinforcing member 3 in which the carbon fiber sheets 1 are adhered to both sides of the steel plate 2. Body 3 applied to only one side to increase the tensile strength of steel
May be used.

FIG. 3 shows a state in which the reinforcing member 3 is fixed by anchor bolts 4. That is, the fixing method of the reinforcing member 3 is to provide a fixing hole 4A on the surface of the concrete skeleton P, and insert the anchor bolt 4 into the fixing hole 4A to fix. At this time, the concrete skeleton P and the reinforcing member 3 are brought into close contact with the gap between the concrete skeleton P and the reinforcing member 3 via the polymer cement 5, so that an extremely strong fixing force is obtained, and reliable reinforcement is possible. (Fig. 4
reference).

[0016]

According to the present invention, the first object is achieved by the above-described structure.

That is, according to the first and third aspects, it has become possible to reinforce the deteriorated concrete skeleton quickly and with extremely simple work, regardless of the reinforcing portion.

Further, according to the second aspect, the heat resistance of the reinforcing member 3 can be enhanced.

According to the fourth aspect, the fixing force between the concrete skeleton P and the reinforcing member 3 is increased, and a reliable reinforcing force can be obtained.

As described above, according to the present invention, there are mainly industrially useful effects such as the ability to quickly reinforce a deteriorated concrete skeleton regardless of the reinforcing points with extremely simple work. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a construction state of the present invention.

FIG. 2 is a front view of a main part showing a construction state of the present invention.

FIG. 3 is an enlarged sectional view showing a mounted state of an anchor bolt.

FIG. 4 is a cross-sectional view of a main part showing a polymer cement interposed in a gap between the surface of a concrete body and a reinforcing body.

FIG. 5 is a sectional view of a main part showing a conventional construction method.

[Explanation of symbols]

 P Concrete frame P1 Foundation 1 Carbon fiber sheet 2 Steel plate 3 Reinforcement 4 Anchor bolt 4A Fixing hole 5 Polymer cement

Claims (4)

[Claims] 1. A carbon fiber sheet in which carbon fibers are arranged and bonded in one direction, a carbon fiber sheet is provided, and the carbon fiber sheet is adhered to a plate surface of a steel plate to form a reinforcing member. A seismic retrofitting method characterized in that it is fixed to the surface of the building and reinforced. 2. The method according to claim 1, wherein the carbon fiber sheet is bonded to a steel plate with an epoxy resin agent, and a heat-resistant paint is applied to the surface of the bonded carbon fiber sheet. 3. The method of claim 1, wherein the cracks formed on the surface of the concrete body are covered with a reinforcing body, and the reinforcing body is fixed to the concrete body with anchor bolts. 4. The method according to claim 1, wherein the gap between the surface of the concrete body and the reinforcing member is brought into intimate contact with a polymer cement.
Either of the seismic reinforcement methods described.