JPH0891913A - Reinforcing steel substitute made of frp and its production - Google Patents

Abstract

PURPOSE: To provide a light-weight FPE as a substitute for reinforcing steel. CONSTITUTION: This FRP material substituting for reinforcing steel is produced by reinforcing a thermosetting resin with plural bundles of reinforcing fibers 5 continuing in one direction, winding the outer circumference of the obtained rod material 1 with a winding material 2 having a filament or web form and forming unevenness on the surface. A hollow part 3 continuing in longitudinal direction is formed in the rod material 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FRP reinforcing bar substitute material embedded in a concrete structure as a substitute for a reinforcing bar, a PC steel material or the like used in the field of civil engineering, and a method for producing the same.

[0002]

2. Description of the Related Art The applicants of the present invention are concerned with a FRP rebar substitute material and a method for producing the same according to the previously filed Japanese Patent Application Laid-Open No. 4-89346 (hereinafter referred to as "conventional example"). Then, the fibers are wound around a bundle of reinforcing fibers impregnated with a thermosetting resin to obtain adhesion strength with concrete to form irregularities on the surface, and then the thermosetting resin is cured, and the bundle and the bundle are wound. We have proposed a technology to firmly integrate the swirl fibers.

The present invention relates to an improved invention of the above-mentioned prior art, and is of course extremely light in weight and has a high ratio of (concrete bond strength) / (tensile strength) as well as the characteristics of this prior art. An alternative material and a manufacturing method thereof are provided.

[0004]

The gist of the present invention will be described with reference to the accompanying drawings.

A rod-shaped body 1 reinforced with a thermosetting resin by a bundle of a plurality of reinforcing fibers 5 continuous in one direction is wound around a thread-shaped or band-shaped winding body 2 to form irregularities on the surface. FRP steel bar substitute material, characterized in that a hollow portion 3 continuous in the longitudinal direction is provided inside a rod-shaped body 1.
The present invention relates to a reinforcing bar substitute material.

In the FRP reinforcing bar substitute material according to claim 1, the FRP reinforcing bar substitute material is characterized in that a plurality of hollow portions 3 are provided.

A rod-shaped body 1 reinforced by a thermosetting resin with a bundle of a plurality of reinforcing fibers 5 continuous in one direction is wound with a thread-shaped or band-shaped wound body 2 to form irregularities on the surface. The present invention relates to a FRP reinforcing bar substitute, characterized in that a resilient member 4 having elasticity that is continuous in the longitudinal direction is provided inside the rod-shaped body 1.

The FRP reinforcing bar substitute according to claim 3, wherein a plurality of elastic members 4 are provided.
The present invention relates to a reinforcing bar substitute material.

The FRP rebar substitute material according to any one of claims 3 and 4, wherein rubber or plastic is adopted as the elastic member 4.

In the FRP reinforcing bar substitute material according to any one of claims 1 and 2, the hollow portion 3 is formed by providing a tube 6 made of rubber or plastic in the rod-shaped body 1. The present invention relates to a reinforcing bar substitute material.

In the FRP reinforcing bar substitute material according to claim 6, the tube 6 is filled with an elastic member 4 having elasticity such as rubber, plastic, sponge-like member, or the like. It is a thing.

A rod-shaped body 1 reinforced by a thermosetting resin with a bundle of a plurality of reinforcing fibers 5 continuous in one direction is wound with a thread-shaped or band-shaped wound body 2 to form irregularities on the surface. A method for manufacturing a FRP-made reinforcing bar substitute, which comprises continuously pulling out a plurality of reinforcing fibers 5 continuous in one direction, impregnating the reinforcing fibers 5 with a thermosetting resin, and then passing through a die 7 to When the reinforcing fibers 5 are bundled, a continuous tube 6 made of rubber or plastic is configured such that the tubes 6 are arranged in the bundle in the longitudinal direction, and the tubes 6 are incorporated. The present invention relates to a method for manufacturing an FRP rebar substitute material, which comprises winding a thread or strip-shaped winding body 2 around the outer circumference of a bundle to form irregularities on the surface, and then heat-curing.

[0013]

The FRP reinforcing bar substitute material according to the present invention is lightweight because it has the hollow portion 3 inside the rod-shaped body 1 and can be easily wound without requiring special equipment or consideration in the molding process. Surface irregularities can be formed by tightening.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The drawings illustrate an embodiment of the present invention and are described below.

FIG. 1 shows the forming process of the FRP reinforcing bar substitute material according to the present invention. As the reinforcing fibers 5, 125 aramid fibers (Kevlar 49, type 968 7100 denier) of DuPont Toray Co., Ltd. were prepared. To do. Although aramid fiber is used as the reinforcing fiber 5, the reinforcing fiber 5
As a matter of course, any of various inorganic and organic fibers such as glass fiber and carbon fiber may be used, or two or more kinds of fibers may be used in combination so as to match the application.

Also, as the rubber tube 6, Toa Kagaku
Prepare seven Toaron tubes φ4 (outer diameter) × φ2 (inner diameter) from Co., Ltd. The tube 6 is not limited to a rubber tube, but may be any tube as long as it has appropriate flexibility.

Two nylon 66, 1260 denier Toray Co., Ltd. nylons are prepared as a thread-shaped winding body 2 which is wound spirally around the bundle of aramid fibers at regular intervals. The wound body 2 may be any other material such as a strip-shaped fiber or a tape-shaped woven fabric.

Also, as an epoxy resin, Yuka Shell Co., Ltd.
A mixture of 100 parts of Epicoat 807 manufactured by Yuka Shell Co., Ltd. as a curing agent and 36 parts of Epicure 113 manufactured by Yuka Shell Co., Ltd. is prepared. In addition to epoxy resin, vinyl ester resin,
Of course, a thermosetting resin such as an unsaturated polyester resin may be used.

Using these, an FRP having an outermost diameter average of 16.6 mmφ and having irregularities on the surface according to the molding process of FIG.
A steel bar substitute material was obtained.

The manufacturing method will be specifically described with reference to FIG.

A plurality of the aramid fibers that are continuous in one direction are impregnated with the prepared epoxy resin, squeeze the excess resin, and then divided into a predetermined number, and each small fiber bundle is used for shape setting. Pass through the guide plate 16. At this time, a plurality of the tubes 6 drawn out separately from the aramid fiber are arranged so as to be between the small fiber bundles of the aramid fiber, and the whole (aramid fiber and tube 6) is molded into a desired shape. 7, and then, the nylon 66 as the wound body 2 is wound so as to be tightly wound at a constant interval, subsequently, is heat-cured in a heat curing furnace 15, and then is cut by a cutting machine 10. To obtain a FRP reinforcing bar substitute with a predetermined length. The epoxy resin may be semi-cured by slightly heating it before winding the nylon 66.

Reference numeral 8 is a resin storage portion, and 9 is a take-up machine.

FIG. 2 shows the external shape of the FRP reinforcing bar substitute material.
4 to 4, and Table 1 shows the dimensions, the tensile strength of members and the concrete adhesion strength which are design guidelines for concrete reinforcement.

[0024]

[Table 1]

As shown in FIG. 5, the tensile strength of this FRP rebar substitute material is such that a metal sleeve 11 is arranged at both ends of a sample length of 1000 mm and 300 mm portions, and the metal sleeve 11 and the sample are integrated with an epoxy grout agent 12. After that, the capacity is 100t
The metal sleeve 11 was gripped by the tensile tester, and was pulled and ruptured on both sides.

The concrete adhesion strength was determined in accordance with the adhesion test method (tentative plan) for continuous fiber reinforcement by the Japan Society of Civil Engineers.

As a comparative example, the following FRP steel bar substitute material was prepared.

An FRP rebar substitute material having an average outermost diameter of 12.4 mmφ was obtained according to the same molding process as in the above-mentioned example except that the rubber tube 6 was not used.

Table 1 shows the dimensions, tensile strength and concrete adhesion strength of the FRP reinforcing bar substitute material.

Table 1 also shows the dimension, tensile strength and concrete adhesion strength of the conventionally proposed deformed bar D13.

From the above, the FRP reinforcing bar substitute material according to the present embodiment is provided with the hollow portion 3 inside by the tube 6 made of rubber.
Therefore, it is possible to easily form the concavo-convex of the winding tightening due to the winding of the winding body 2 without requiring a special operation or a device. That is, a large unevenness difference can be easily formed.

In this embodiment, the diameter can be increased without changing the amount of the reinforcing fiber used. This means that the surface area is increased, and therefore the adhesion strength with concrete is greatly increased.

FIGS. 6 and 7 show another example. FIG. 6 shows a case where a rubber tube 6 is filled with a sponge-like member 13, and FIG. 7 shows a case where a rubber tube 6 is filled with a loosely knitted knitting member 14. That is the case.

[0034]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is extremely lightweight, and an FRP rebar substitute material and a method for producing the same that can be firmly adhered to concrete because the surface irregularities can be easily formed. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a manufacturing process of the present embodiment.

FIG. 2 is an explanatory perspective view of the present embodiment.

FIG. 3 is a vertical sectional view for explaining the present embodiment.

FIG. 4 is a cross sectional view for explaining the present embodiment.

FIG. 5 is an explanatory diagram of a tensile strength test of this example.

FIG. 6 is a cross-sectional view of another example.

FIG. 7 is a cross-sectional view of another example.

[Explanation of symbols]

 1 bar-shaped body 2 wound body 3 hollow part 4 elastic member 5 reinforcing fiber 6 tube 7 die

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technology display location B29C 70/52 // B29L 31:10 (72) Inventor Yuichi Tanaka 1-5-5 Minamihonmachi, Joetsu City, Niigata Prefecture No. Stock Company Arisawa Manufacturing Co., Ltd.

Claims (8)

[Claims] 1. A FR comprising a rod-shaped body reinforced with a thermosetting resin reinforced by a bundle of a plurality of reinforcing fibers continuous in one direction, around which a thread-shaped or band-shaped wound body is wound to form irregularities on the surface.
An FRP reinforcing bar substitute, which is a P reinforcing bar substitute, wherein a hollow portion continuous in the longitudinal direction is provided inside a rod-shaped body. 2. The FRP rebar substitute material according to claim 1, wherein a plurality of hollow portions are provided. 3. A FR formed by winding a thread-shaped or band-shaped wound body around the outer periphery of a rod-shaped body reinforced with a thermosetting resin by a plurality of reinforcing fiber bundles continuous in one direction to form irregularities on the surface.
A PRP reinforcing bar substitute, characterized in that an elastic member having elasticity continuous in the longitudinal direction is provided inside a rod-shaped body. 4. The FRP rebar substitute material according to claim 3, wherein a plurality of elastic members are provided.
Alternative material for steel reinforcement. 5. The FRP according to claim 3,
An FRP reinforcing bar substitute, characterized by using rubber or plastic as an elastic member in the reinforcing bar substitute. 6. The FRP according to claim 1,
In the reinforcing bar substitute material, an FRP reinforcing bar substitute material, characterized in that a hollow portion is formed by providing a tube made of rubber or plastic in a rod-shaped body. 7. The FRP rebar substitute material according to claim 6, wherein the tube is filled with an elastic member having elasticity such as rubber, plastic, or a sponge-like member. 8. An FR formed by winding a thread-shaped or strip-shaped wound body around the outer periphery of a rod-shaped body reinforced with a thermosetting resin with a bundle of a plurality of reinforcing fibers continuous in one direction to form irregularities on the surface.
A method for manufacturing a P-reinforced reinforcing material, comprising continuously extracting a plurality of reinforcing fibers in one direction, impregnating the reinforcing fibers with a thermosetting resin, and then passing the reinforcing fibers through a die. When making a bundle, a continuous tube made of rubber or plastic is configured such that the tube is arranged inside the bundle in the longitudinal direction, and the tube is provided with threads or strips on the outer circumference of the bundle. A method for manufacturing an FRP-made reinforcing bar substitute material, which comprises winding a wound body to form irregularities on the surface, and then heat-curing the wound body.