JPH0730809Y2 - Fixing tool for fiber-reinforced tendons - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fixing tool for a fixed end for embedding and fixing a fiber-reinforced tendon in a structure such as a ground anchor or a prestressed structure.

[Problems to be solved by the device]

A rod reinforced with fibers such as carbon fiber, aromatic polyamide fiber, and glass fiber has high tensile strength, high elastic modulus, corrosion resistance, light weight, and electrical insulation (excluding carbon fiber).
Attention has been focused on the use of ground anchors instead of steel materials or tension materials for structures such as prestressed concrete structures.

However, fiber-reinforced synthetic resin tendons (hereinafter referred to as FRP
(Abbreviated as tension material) is a fixing structure like conventional steel tension material,
For example, it was not possible to have a structure in which a tension material screw is cut and a fixing plate or the like is screwed and attached. For this purpose, for example, the end of one FRP tendon may be inserted into a fixing tool having one cylindrical hollow portion and filled with grout to be fixed (actual application).
No. 62-192384) or an attachment means such as inserting a hellish wedge into the hollow part of the dovetail-shaped mortise formed in the fixing device and filling and fixing with adhesive (Application No. 62-192385). .

However, the means for attaching the fixing tool to the end of these FRP tension members is more complicated than the case of attaching the fixing plate etc. to the steel tension member, and a large number of ends are attached to the ends of the tension members forming a bundle. It took a considerable amount of work to fix and attach the fixing device.

This invention has been made in view of the above problems. The purpose of this is to propose a fixed-end fixing tool for FRP tension material that can attach fixing tools to the ends of a plurality of FRP tension materials arranged in parallel at the same time, which is highly efficient in fixing work, and exhibits high fixing strength. is there.

[Means and Examples for Solving the Problems]

This invention has a plurality of parallel cylindrical hollow chambers partitioned by an outer wall and a longitudinal partition, and front and rear walls of each hollow chamber have small through holes for inserting fiber reinforced tension members, The circumferential wall of the hollow chamber has multiple ridges in the circumferential direction,
A fixing end fixing tool for a fiber-reinforced tendon having a plurality of annular protrusions in the fixing portion, which is made of a casting that is integrally cast.

The fixing tool of the FRP tension material of the present invention is not used as a fixing tool for the tension end because it is not processed for equipment installation for introducing the tension force.

The embodiment will be described below. In FIGS. 1 and 2, the fixing device 2 is an integrally cast product, and has seven cylindrical hollow chambers 3 arranged in parallel, and the front and rear walls 6, 6 correspond to the respective hollow chambers 3. Seven small through holes for inserting the tension member 1 are drilled. As shown in FIG. 3, a plurality of ridges 5 are provided on the peripheral wall of each hollow chamber 3 in the circumferential direction.
To attach the tendons 1 to the fixing tool 2, 7 tendons 1
The end portion of each is inserted into each hollow chamber 3 through the small through hole, and each hollow chamber 3 is filled with the expandable grout 4 and fixedly attached.
Although not shown, a sealing material is placed in the gap between the small through holes of the front and rear walls 6, 6 and the tension material 1 to prevent the expansive grout 4 from leaking. An annular convex portion 7 is provided on the surface of the tension member 1 to be attached to prevent the tension member 1 from coming off due to pulling.

The plurality of tendons 1 having the fixing tool 2 attached to one end in this way are embedded in an anchor body 8 constructed in the ground as shown in FIG. 4, for example, to serve as fixed ends, and the other end to the above-ground structure. Tension is introduced into an object (not shown) to fix it and exert the function of a tension material.

In the above-described embodiment, the fixing device 2 has six hollow chambers arranged side by side around one hollow chamber 3 and has a star-shaped cross section, but the present invention is not limited to this shape. For example, a plurality of hollow portions arranged in parallel along a straight line may be used.

[Effect of action and device]

This device has the above configuration. Since this fixing device has a plurality of hollow chambers arranged in parallel, it is possible to attach as many tension members as the number of hollow chambers to one fixing device, and to improve the efficiency of the fixing work. In addition, the mutual positions of the end fixings of the plurality of tension members become accurate, the pressure bearing cross-sectional area of the fixing tool becomes wide, and a high pressure bearing effect is exhibited.

Furthermore, since a plurality of ridges are provided on the circumferential wall of each hollow chamber 3 in the circumferential direction, the adhesion strength with the expansive grout to be filled together with the unevenness of the tension material to be used is increased, so that the tension The fixing strength of the material increases.

As described above, this fixing tool can improve the fixing work efficiency and the fixing strength of the fiber-reinforced tendons.

[Brief description of drawings]

FIGS. 1 and 2 are the fixing device of the embodiment and the FRP with the end portion fixed to the fixing device.
A cross-sectional view and a side view of the tension member, FIG. 3 is a vertical cross-sectional view of one hollow chamber of the fixing device, and FIG. 4 is a longitudinal section in which the tension member having the fixing member fixed to the end is embedded in the anchor body and fixed It is a side view. 1 ... FRP tension material, 2 ... fixing device, 3 ... hollow chamber, 4 ...
… Grout, 5 …… convex, 6 …… front and back walls, 7 …… convex,
8 ... Anchor body.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Hikaru Sasao 2-19-1 Tobita-cho, Chofu-shi, Tokyo Inside Kashima Construction Co., Ltd. (72) Creator Fumio Kinoshita 2--19-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Satoru Mochida 2-19-1 Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Tsuneo Tanaka 1000-1, Kamoshida-cho, Midori-ku, Yokohama, Kanagawa Prefecture Inside Ryokasei Co., Ltd. (72) Kensuke Taniki, 1000, Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Sanryo Kasei Co., Ltd. (56) Reference JP-A-64-33345 (JP, A) Kosho 48-16826 (JP, B1)

Claims (1)

[Scope of utility model registration request] 1. A plurality of parallel cylindrical hollow chambers partitioned by an outer wall and a longitudinal partition, and front and rear walls of each hollow chamber have small through holes for inserting fiber-reinforced tension members. The circumferential wall of each hollow chamber has multiple ridges in the circumferential direction,
A fixed-end fixing tool for fiber-reinforced tendons having a plurality of annular protrusions in the fixing portion, which is made of a casting that is integrally cast.