JPH0674648B2 - Method for producing concrete structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a concrete structure, and more specifically, to a concrete structure obtained by shearing and reinforcing an existing concrete structural member such as a pillar or a beam. The present invention relates to a manufacturing method.

(Conventional method) Conventionally, in order to impart seismic resistance to existing concrete structural members, a shear reinforcing member such as a steel plate, a welded wire mesh, a composite material of a strip plate and mortar, or a composite material of a strip shape and an epoxy resin is applied. Methods have been proposed and implemented.

(Problems to be solved by the invention) However, when performing conventional seismic reinforcement with a reinforcing member such as a steel plate, it is indispensable to perform welding work on the steel plate or the like at the site, and the training skill is excellent. The desired reinforcement cannot be obtained unless it is done by a person.

Also, mortar or the like is injected between the existing concrete structural member and the steel plate, welded wire mesh or the like to achieve stress transmission, but it is difficult to densely inject the injected mortar or the like between them. It was

(Means for Solving Problems) Therefore, as a result of intensive investigations by the present inventors to solve the conventional drawbacks, as a result, the outer periphery of the concrete structural member was wound with the reinforcing fiber immediately after being impregnated with the resin. By turning
The inventors have found that the winding process can be easily performed and the concrete structure can be effectively subjected to seismic reinforcement, and the present invention has been completed.

That is, an object of the present invention is to provide a method for simply and reliably performing seismic reinforcement on a concrete structural member.

And, in the method of manufacturing a concrete structure which is provided with a reinforcing member made of a fiber reinforced resin on the outer circumference of a concrete structure member, while impregnating the resin with the fiber, winding on the outer circumference of the concrete structure member is performed. This is achieved by a method for producing a characteristic concrete structure.

As the concrete structural member used in the present invention, a concrete structural member such as a column or a beam in a conventional existing reinforced concrete structure or an existing steel frame reinforced concrete structure is used. Especially designed according to the design / calculation standards before 1969
Since the amount of shear reinforcement is small in the constructed reinforced concrete structure member, the shear reinforcement effect is large.

Although a conventionally known fiber-reinforced resin is used as the reinforcing member made of the fiber-reinforced resin, for example, a composite material obtained by strengthening the resin with carbon fiber, glass fiber or the like is more preferable in terms of its own weight. As the fibers, those having high strength and high elasticity are particularly preferable because they have a great effect of suppressing the expansion of cracks generated in the concrete structural member.

The resin is not particularly limited as long as it is a known resin used for fiber reinforced resin, but an epoxy resin is generally used.

In the present invention, a reinforcing member made of a fiber reinforced resin is wound around the outer periphery of the concrete structural member, but the reinforcing member is wound, but the reinforcing member is formed by impregnating the resin with the fibers immediately before the winding treatment, It is then important to wind around the outer circumference of the concrete structural member.

By such a method, it is possible to reliably impregnate the fibers with the resin, and since the fibers in a supple state before curing can be wound while conforming to the concrete surface, the concrete structural members can be easily and reliably reinforced against earthquakes. It is possible to apply.

Here, the present invention will be specifically described with reference to the drawings. FIG. 1 shows an example of an embodiment of the method of the present invention.

In FIG. 1, 1 is a concrete structural member, 2 is fiber, 3 is resin, 4 is a resin impregnation tank, 5 is a guide roller,
6 indicates bobbins, respectively.

The fiber 2 is taken out from the bobbin 6, transferred to the resin impregnation tank 4 by the guide roller 5 and sufficiently impregnated with the resin 3, and then wound around the outer periphery of the concrete structural member 1 and then cured with the resin. Apply seismic reinforcement.

The winding treatment may be performed by using a machine, but may be performed by a human hand depending on the site of the concrete structural member or the surrounding environment.

Also, after the winding process, the reinforcing member is pressed and expanded widely in a tape shape, so that the contact area of the reinforcing member increases, so stress concentration is relieved and breakage of the reinforcing member is delayed, and effective seismic reinforcement is performed. Is preferably performed.

In addition, if a primer such as an epoxy resin is applied to the outer periphery of the concrete structural member in advance to perform a base treatment,
Since the adhesion between the reinforcing member and the concrete structural member is improved, the reinforcing strength is improved, which is preferable.

If a layer of polyethylene film or the like is provided on the outer periphery of the concrete structure member, the concrete structure member and the reinforcing member do not directly adhere to each other, so that stress concentration on the reinforcing member due to cracks generated in the concrete structure can be relaxed. It is preferable because the deformability of the body can be improved.

The outside of the concrete structure obtained in this manner is desirably covered with a material of a certain degree for the purpose of protecting the reinforcing member and making a decorative finish.

(Effects) According to the present invention, it is industrially advantageous because it can be carried out easily and reliably in a place where shear reinforcement of an existing concrete structural member is carried out.

[Brief description of drawings]

 FIG. 1 is a schematic diagram illustrating the method of the present invention. 1; Concrete structural member, 2; Fiber 3; Resin, 4; Resin impregnation tank 5; Guide roller, 6; Bobbin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Ando 1000 Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Sanryo Kasei Kogyo Co., Ltd. (56) Reference JP-A-52-89211 (JP, A) Japanese Patent Publication No. 56-33542 (JP, B2) Japanese Patent Publication No. 53-16214 (JP, B2) Actual application No. 52-64002 (Actual application No. 53-159115) Photographed microfilm (JP, U)

Claims (2)

[Claims] 1. A method for producing a concrete structure comprising a reinforcing member made of a fiber reinforced resin on the outer periphery of a concrete structure member, wherein fibers are impregnated with resin.
A method for producing a concrete structure, which comprises winding around a concrete structure member. 2. The method according to claim 1, wherein the fiber is impregnated with the resin, the fiber is wound around the outer periphery of the concrete structural member, and then pressed to expand the reinforcing member into a tape shape. .