JPH01290414A - Stretching member made of fiber reinforced resin composite body - Google Patents

Abstract

PURPOSE:To obtain a stretching member having large capacity by a method wherein at least one end of respective fiber reinforced resin composite bodies, which compose a stretching member, are spread through spacers and the resultant spread part is impregnated with resin and hardened. CONSTITUTION:As the continuous long fiber, carbon fiber or aramid fiber is preferably used from the side of the physical properties such as tensile strength and the like. As the matrix resin of the fiber reinforced resin composite material, thermosetting resin such as epoxy resin, unsaturated polyester resin or the like is used. And, a plurality of stretching member 1 made of fiber reinforced resin composite bodies are bundled and a shape, which is spread at the end of each stretching member 1 made of fiber reinforced resin composite bodies, is produced through spacers 2 and 3. The resultant spread part is impregnated with epoxy resin or the like so as to integrally fixed the members to one another by hardening the resin. Accordingly, the arbitrary shape can be obtained. The stretching and anchoring work is easily done by utilizing said spread part. The intrinsic strength of the fiber reinforced resin composite body, which is reinforced by longitudinally arranged and bundle continuous filaments, can be fully utilized and at the same time large stretching capacity of the bundled stretching members can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to tendons used for braceless structures, ground anchors, and the like.

More specifically, the present invention relates to a case where a fiber-reinforced resin composite arranged and bundled in the longitudinal direction is used as a tendon material.

[Conventional technology and problems]

Conventionally, prestressed concrete steel wires, steel bars, and stranded wires (hereinafter referred to as PC steel wires, PC steel bars, and PC stranded wires) have been widely used as tension materials for prestressed structures and ground anchors. However, these P
C steel wire, PC steel rod, and PC stranded wire are at risk of rusting, and if rust develops and corrosion progresses, prestress will decrease.
There is a risk of a serious structural event such as extinction.
In recent years, attempts have been made to use a fiber-reinforced resin composite reinforced with continuous filaments arranged and bundled in the longitudinal direction, which is a non-corrosive material, as the tension material.

Various methods have been proposed for tensioning and fixing this fiber-reinforced resin composite tendon, but all of them involve tensioning and fixing a single fiber-reinforced resin composite tendon. The capacity was small and insufficient for practical tension capacity.

The reason for this is that tendons made of fiber-reinforced resin composites are often manufactured by the pultrusion method, but tendons made of fiber-reinforced resin composites with a large cross-sectional area tend to have voids inside, and are also heated. There are manufacturing problems such as difficulty in curing fiber-reinforced resin composite tendons with a large cross-sectional area, and the ratio of surface area to cross-sectional area is small. There was a problem in that the high tensile strength of the steel could not be fully utilized.

[Failure to solve the problem]

Therefore, as a result of intensive studies to solve these problems, the present inventors have found that the above problems can be solved by using a tension material in which a plurality of fiber reinforced resin composites are integrally fixed using a specific method. We have arrived at the heading Invention.

That is, an object of the present invention is to fully utilize the inherent strength of a fiber-reinforced resin composite reinforced with continuous filaments arranged and bundled in the longitudinal direction, which is a tendon material used in prestressed structures and ground anchors, and to achieve a large capacity. The purpose is to provide tendons.

The object is a fiber-reinforced resin composite tendon, which is made by bundling and integrating a plurality of fiber-reinforced resin composites reinforced with continuous filaments, and at least one of the fiber-reinforced resin composites constituting the tension material. This can be easily achieved by using a tendon made of a fiber-reinforced resin composite, which is characterized in that the end portions of the fiber-reinforced resin composite are expanded through spacers, and then the expanded portions are impregnated with resin and cured to be integrally fixed.

The present invention will be explained in more detail below.

Examples of the continuous long fibers used in the present invention include carbon fibers, aramid fibers, and glass fibers, but it is preferable to use carbon fibers or aramid fibers from the viewpoint of physical properties such as tensile strength.

A fiber-reinforced resin composite material using such continuous long fibers as a reinforcing material can be easily manufactured by using a thermosetting resin such as an epoxy resin or an unsaturated polyester resin as a matrix resin according to a conventional method, for example, by a pultrusion method. I can do it.

The tension material of the present invention comprises a plurality of the above fiber reinforced resin composites,
It is important to bundle them in parallel, expand at least one end via a spacer, and then impregnate and harden the expanded portion with epoxy resin or the like to fix them integrally.

The spacer to be used is not particularly limited as long as it can maintain the expanded shape at the end of the composite, for example, a plate-shaped material with the same number of holes as the number of bundled pieces expanded at the end. This is done by inserting a plurality of them, or by pushing a wedge-shaped body in the direction of the fiber axis with a plurality of them bundled.

In addition, although either one end of the tendon of the present invention may be fixed integrally as described above, both ends may be fixed in the same manner as necessary.Furthermore, the present invention To explain more specifically using drawings,
The fiber-reinforced resin composite tendon material of the present invention is produced by bundling a plurality of fiber-reinforced resin composite tendon materials l as shown in FIG. The fiber-reinforced resin composite tension member has a shape that widens at the end thereof through a through-hole.

Although this example shows the case of three, the number can be arbitrary. The spacer can also have a shape as shown in Figures 1 and 5.

The fiber-reinforced resin composite tendon of the present invention has a shape that expands at the end of the fiber-reinforced resin composite tendon via the spacer and the spacer 3, so this part cannot be hardened with resin or the like. Therefore, when embedded in concrete or mortar, it exhibits an anchor effect and can obtain high pull-out strength.

In addition, when the fiber-reinforced resin composite tension material of the present invention is used as a tension material in a ground anchor, as shown in Figure 6, the fiber-reinforced resin composite has excellent corrosion resistance, so it can be used permanently. (S is an anchor head, and 6 is an integral part of the anchor).

〔Effect of the invention〕

As explained above, in the fiber-reinforced resin composite tendon material of the present invention, a plurality of fiber-reinforced resin composite tendon materials are bundled, the ends are spread through spacers, and the spread portions are hardened with resin. In particular, it can be made into any shape, and this part can be used to easily perform tensioning and fixing operations. The strength can be fully utilized, and it can also be used when a large tension capacity is required.

Furthermore, by using the fiber-reinforced resin composite tendon material of the present invention in the fixed end portion of the tendon material used in prestressed structures and ground anchors, the fixed end portion can be made sufficiently safe against tension loads.

[Brief explanation of the drawing]

Figure 1 shows tension material and spacer made of fiber-reinforced resin composite. Figure 1 shows spacer with through hole (small). Figure 3 shows spacer with through hole (large). Figures D and S show spacer with through hole. Other shapes FIG. 6 shows an example of the fiber-reinforced resin composite tendon material of the present invention (
ground anchor). /...Fiber-reinforced resin composite tension material 2...
Spacer with through hole (small) 3...Spacer with through hole (dog) D...Through hole S...Anchor head 6...Anchor integrated application Person Kajima Corporation Co., Ltd. The company and 7 other representatives, Patent Attorney Chief Kagawa, and 7 others. i-th

Claims (1)

[Claims] (1) A fiber-reinforced resin composite tendon made by bundling and integrating a plurality of fiber-reinforced resin composites reinforced with continuous long fibers, at least one end of each fiber-reinforced resin composite forming the tendon. 1. A tendon material made of a fiber-reinforced resin composite, characterized in that the expanded portion is expanded through a spacer, and then the expanded portion is impregnated with a resin and cured to be integrally fixed.