JPH0625458B2 - Fixing device for fiber-reinforced plastic tendons - Google Patents

Description

The present invention relates to a fixing device for fixing a tension member made of fiber reinforced plastic (hereinafter referred to as FRP) to a ground anchor, a prestressed structure or the like.

[Problems to be Solved by the Invention]

FRP rods made of carbon fiber, aromatic polyamide fiber, glass fiber and other fibers as reinforcements have high tensile strength, high tensile modulus, corrosion resistance, light weight, electrical insulation (excluding carbon fiber), etc. In place of steel, its use as a tension material for ground anchors or prestressed concrete structures is drawing attention.

However, these FRP tendons cannot be made into a fixing structure like a conventional steel tension material, for example, a structure in which a screw is cut and a fixing plate or the like is screwed and attached. Also, F
As a fixing device for the RP tension material, for example, there is a proposal to insert the end portion of the tension material into a tubular fixing tool and to fill the tubular hollow portion with an adhesive so as to fix it, but an organic adhesive or FR
The base material resins of P are easily broken by the shearing force, and it was difficult to obtain a strong fixing strength for pulling out.

The present invention has been made in view of the above circumstances. Its purpose is to propose a fixing method which has a high fixing strength against pulling out, is lightweight, has a simple structure, has good workability, and can be exhibited without impairing the characteristics of the FRP tension material.

[Means for Solving the Problems]

This FRP tension material fixing device has a plurality of FRs arranged in parallel.
In the fixing device for the end portions of the P tension member, the tension members arranged in parallel are alternately crossed in the form of a woven fabric thread, and a plurality of fixing rods in a direction orthogonal to the intersecting tension members are woven in a weft shape. Rarely, it is characterized in that attached reinforcing plates are fixed to both side surfaces of the leading edge portions of the tension members arranged in parallel.

Hereinafter, the present invention will be described with reference to illustrated embodiments. In Figs. 1 and 2, one or more FRP tension members having a diameter of 3 mm and having carbon fibers as reinforcing fibers and epoxy resin as a base material are arranged in parallel. The fixing device at the end portion of the tension members 1 arranged in parallel intersects alternately like a warp of a woven fabric.
A plurality of fixing rods 2 in the direction orthogonal to one are woven in a weft shape at a predetermined interval. Then, a reinforcing plate 3 having a thickness of 1 mm of FRP, which is made of epoxy resin reinforced with carbon fiber as a base material, is attached to both side surfaces of the tension members 1 arranged in parallel at the tip edge portions, and steps are provided in four steps. , Is attached and configured with epoxy resin. In this embodiment, the aligning rods 4 and 4 in the direction orthogonal to both side surfaces of the FRP tension members 1 arranged in parallel are arranged opposite to each other at a position opposite to the tip of the fixing device, and are tied with a binding cord (Fig. (Not shown), tension material 1 in parallel
Are aligned.

The fixing rod used in this fixing device and the reinforcing plate attached to the tip edge portion may be made of FRP or metal, but FRP is suitable because it has corrosion resistance and light weight and has sufficient strength. . In the case of a reinforcing plate, it is preferable to use FRP made of a resin of the same type as the FRP tension material as a base material for adhesive bonding.

[Work]

This fixing device is configured as described above, and is embedded in the ground anchor 5 as shown in FIG. 3, for example, to fix the tension member 1.
In this fixing device embedded in this way, the pull-out stress acting on the tension member is transmitted to the plurality of fixing rods woven between the tension members and the reinforcing plate fixed to the tip edge portion. The reinforcing plate is fixedly integrated with the tension material to exert bearing strength and support stress,
At the same time, it restrains the movement of the fixing rod and improves the bearing strength of the fixing rod. Therefore, the pull-out stress is dispersed and supported by the reinforcing plate and the fixing rod, so that the stress does not concentrate and the FRP
Breakage of tendons is unlikely to occur.

This fixing device can be assembled at the construction site, but if the fixing rod is woven in advance and the reinforcing plate is fixed and assembled before the construction, there is little variation in quality and the efficiency of field work can be promoted. Since the fixing rod and the reinforcing plate are only the end portions of the tension material, there is no deterioration in handleability such as winding and unwinding of the tension material.

〔The invention's effect〕

The present invention is as described above, and this FRP tension member fixing device has high fixing strength against pulling out and can be exhibited without impairing the characteristics of the FRP tension member. Moreover, it is lightweight, has a simple structure, and is excellent in workability.

[Brief description of drawings]

1 and 2 are a front view and a side view of a fixing device according to an embodiment,
FIG. 3 is a vertical sectional view of the fixing device embedded in the ground anchor. 1 ... FRP tension material, 2 ... Fixing rod, 3 ... Reinforcing plate, 4 ... Alignment rod, 5 ... Ground anchor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Mochida 2-19-1 Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Jun Matsushima 2-1-11-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (56) Reference JP-A-1-163345 (JP, A)

Claims (1)

[Claims] 1. A fixing device for a plurality of fiber-reinforced plastic tendon end portions arranged in parallel, wherein the juxtaposed tendons are alternately crossed in the form of a woven fabric thread, and are arranged in a direction perpendicular to the crossed tendons. Multiple fixing rods are woven in a weft shape,
A fixing device for a tension member made of fiber reinforced plastic, wherein attached reinforcing plates are fixed to both side surfaces of leading edge portions of the tension members arranged in parallel.