JPH0751820B2 - Fiber-reinforced resin composite tension material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tension material used for prestressed structures, ground anchors and the like.

More specifically, the present invention relates to the case where a fiber-reinforced resin composite body which is arrayed and focused in the longitudinal direction is used as a tension material.

[Conventional technology and problems]

Conventionally, steel wires for prestressed concrete, steel rods, and stranded wires (hereinafter referred to as PC steel wire, PC steel rod, and PC stranded wire) have been widely used as tension materials used in prestressed structures and ground anchors. However, these PC steel wires, PC steel rods, and PC stranded wires are at risk of rusting, and once rusting and corrosion progresses, there is a danger of serious structural problems such as prestress reduction and disappearance. In recent years, attempts have been made to use a fiber-reinforced resin composite which is reinforced by continuous filaments that are aligned and focused in the longitudinal direction, which is a non-rust material.

Various methods have been proposed as a method for tensioning / fixing the fiber-reinforced resin composite tension material, but each of them relates to a fixing body or a fixing method, and relates to the fiber-reinforced resin composite tension material itself. It wasn't something.

The reason for this is that the fiber-reinforced resin composite tension material is often manufactured continuously by the pultrusion method,
This is because there is a manufacturing constraint that only a product with a constant cross-sectional shape can be obtained.

Further, since the fiber-reinforced resin composite tension material produced by the pultrusion molding method has continuous filaments arrayed and bundled in the longitudinal direction, the longitudinal strength is very high, but the cross-sectional shape is Changing it disturbs the continuous filaments that are arrayed and focused, and there is a problem that the strength in the longitudinal direction is reduced.

[Means for solving problems]

Therefore, as a result of intensive investigations by the present inventors to solve such problems, they found that the above-mentioned problems can be solved by a plurality of fiber-reinforced resin composites by a specific method, and a tension member fixed integrally. The present invention has been reached.

That is, an object of the present invention is to provide a tension material used for a prestressed structure or a ground anchor, that is, a tension material that can sufficiently utilize the original strength of a fiber-reinforced resin composite reinforced by continuous filaments arrayed and focused in the longitudinal direction. That is the purpose.

The purpose is to provide at least two or more fiber reinforced resins by providing a part of the fiber-reinforced resin composite reinforced with continuous long fibers with a part that is not impregnated with the resin and bending the part that is not impregnated with the resin. This is easily achieved by a fiber-reinforced resin composite tension member formed of a plurality of fiber-reinforced resin composites by forming a composite and then impregnating and curing the bent portion with a resin and integrally fixing them. It

Hereinafter, the present invention will be described in detail.

Examples of the continuous continuous fiber used in the present invention include carbon fiber, aramid fiber, glass fiber and the like, but it is preferable to use carbon fiber or aramid fiber from the viewpoint of physical properties such as tensile strength. Then, the fiber-reinforced resin composite having such continuous long fibers as a reinforcing material is 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, a pultrusion molding method. The part which is not impregnated with the resin can be manufactured by forcibly withdrawing from the resin impregnation bath by an operator or mechanically.

The tension member of the present invention is bent at a portion not impregnated with a resin such as an epoxy resin provided in the above fiber reinforced resin composite material, and then the bent portion is impregnated and cured with at least a plurality of resins. It is important to configure the system as a book.

Further, in the case of using a tension member composed of a plurality of three or more pieces, the resin-impregnated portions of the composite are placed at equal intervals and bent at the resin-impregnated portions. It is obtained by impregnating and curing the bent portion with resin.

Hereinafter, the present invention will be described more specifically with reference to the drawings,
As shown in FIG. 1, the prestressed concrete structure 1 has a fiber-reinforced resin composite tension member 3 (for example, carbon fiber, aramid fiber,
The fiber-reinforced resin composite reinforced by continuous filaments such as glass fibers) has a hole larger than the outer diameter of the tension member 3 made of the fiber-reinforced resin composite so that the fiber-reinforced resin composite can pass through this hole. Composite tendons 3 are provided through the holes.

As shown in FIG. 2, the fixed end portion of the fiber-reinforced resin composite tension member 3 is a fixed end obtained by later curing the resin-free portion of the fiber-reinforced resin composite tension member 3 with a resin. A sleeve 4 having an inner diameter which gradually decreases towards the concrete body 2 as shown in FIG.
By the fixing unit composed of the wedge 5 inscribed with
A desired tension is applied to the fiber-reinforced resin composite tension member 3.

The material of the fixing portion can be appropriately selected according to the kind of the tension material, and for example, plastics (engineering plastics, fiber reinforced plastics), metal materials (steel, steel,
Corrosion resistant metal), ceramics and the like.

Since the prestressed concrete structure 1 has the above-described configuration, when constructing the structure 1, first, the concrete main body 2 having a hole for allowing the tendon 3 to penetrate is formed.

Next, the fiber-reinforced resin composite tension member 3 is placed through the hole.

Next, the fixing bodies (4,5) are brought into close contact with the concrete body 2 and attached to the fiber-reinforced resin composite tension member 3.

Next, with the fixing body (4,5) in close contact with the concrete body 2, the tension force applied to the fiber-reinforced resin composite tension member 3 is released from the outside of the fixing body (4,5). As a result, a compressive force acts on the concrete body 2 via the fixing bodies (4,5) and the fixed ends, and the prestressed concrete structure 1 is obtained.

In addition, as shown in FIG. 4, a large number of fiber-reinforced resin composite tension members 3 are used in a bundle, and the anchor member of the ground anchor is used.
Applicable to 10 (7 is a steel plate, 8 is an anchor head, 9 is a hole for ground anchor tension material penetration, 11 is an underground beam, 12
Is a bundle of tendons. ).

〔The invention's effect〕

As described above, in the fiber-reinforced resin composite tension member according to the present invention, by making a part of the tension member a resin-free portion, the resin-free portion is formed into a resin having a free shape afterward. Can be cured by using the portion, tension and fixing work can be easily performed, and the original strength of the fiber-reinforced resin composite reinforced by continuous filaments arrayed and focused in the longitudinal direction can be fully utilized.

Further, by using a resin-free portion of the fiber-reinforced resin composite tension material in the present invention for the fixed end portion of the tension material used for the prestressed structure or the ground anchor, a fixed end sufficiently safe against tension load and can do.

Further, the fiber-reinforced resin composite tension material in the present invention,
It becomes easier to bend the part of the tension material that does not contain resin, and when using a plurality of fiber-reinforced resin composite tension materials in one place, easily arrange a large number of fiber-reinforced resin composite tension materials. Further, it is possible to deal with a prestressed structure or a ground anchor having a large tension capacity by subsequently curing the resin-free portion of the tension material with a resin into a free shape.

[Brief description of drawings]

FIG. 1 is a structural example (prestressed structure) of a fiber-reinforced resin composite tension member of the present invention, FIGS. 2 and 3 are enlarged views of a circled portion in FIG. 1, and FIG. 4 is the present invention. Another example of the fiber-reinforced resin composite tension material of (a ground anchor) is shown. 1 ... Prestressed concrete structure 2 ... Concrete body 3 ... Fiber-reinforced resin composite tension material 4 ... Fixing body (sleeve) 5 ... Fixing body (wedge) 6 ... Fiber-reinforced resin composite tension material The part of resin that does not contain resin is later cured with resin 7 …… Steel plate 8 …… Anchor head 9 …… Ground anchor tension material penetration hole 10 …… Anchor body 11 …… Underground beam 12… ... Bundles of fiber-reinforced resin composite tendons

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Tsuneo Tanaka 1000 Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Sanryoh Chemical Industry Co., Ltd. (72) Inventor Fumio Kinoshita 2-19-1 Tobita, Chofu-shi, Tokyo Issue Kashima Construction Co., Ltd. Technical Research Institute (56) References Japanese Patent Publication No. 57-20900 (JP, B2)

Claims (2)

[Claims] 1. A fiber-reinforced resin composite reinforced with continuous long fibers is provided with a portion not impregnated with resin, and the portion not impregnated with resin is bent to form at least 2
A fiber-reinforced resin composite made up of a plurality of fiber-reinforced resin composites, which are then formed by impregnating and curing a resin in the bent portion and integrally fixing it into a plurality of fiber-reinforced resin composites. Material. 2. The tension member according to claim 1, wherein the resin-impregnated portions of the fiber-reinforced resin composite material are arranged at equal intervals, and all the resin-impregnated portions are bent.