JPH0881914A - Cable covering structure - Google Patents

Abstract

PURPOSE: To make it possible to peel off easily a covering material of an anchored portion of a diagonal cable by interposing a separating material between the surface of a core material and a covering material in a preliminarily determined cut off portion. CONSTITUTION: A paper-made tape 5 or cloth-made tape 5 is wound up around a core material 4 which comprises a plurality of PC steel-made stranded wires as a separating material at a spot 1a equivalent to an anchored portion of a diagonal cable 1 and covered with a synthetic resin-made covering material 6 in one piece thereon. When the cable 1 is installed, the covering material 6 at the spot 1a to be peeled off is peeled off at the anchored portion where the core material 4 at the peeled off portion is anchored by a wedge with an anchor head of the anchored portion. This construction makes it possible to facilitate peeling work since the tape 5 cuts the joining between the core material 4 and the covering material 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable used in, for example, a cable-stayed bridge or a suspension bridge, and more particularly to a structure of coating sheaths at both ends of a cable fixed to a fixing portion.

[0002]

2. Description of the Related Art Conventionally, a diagonal cable 1 which is erected with a required tension between a main tower 2 of a cable-stayed bridge A or the like and fixing portions 2a, 3a of a main girder 3 is shown in FIGS. As described above, a core material formed by bundling PC steel wires or PC steel materials is integrally covered with a covering material made of synthetic resin such as PE, and wound around a drum for storage and transportation.

In using the cable, the drum is transported to an erection site, and is transported to a fixing unit 2a on the main tower 2 side by a guide wire or a feeding device, and then fixed on the main girder 3 side. The cable 1 is bridged over the cable 3a, the covering material in the required range at both ends of the cable is peeled off, and the exposed core material is fixed with a wedge to the through hole of the anchor head of the fixing portion, and then a predetermined portion is jacked or the like. A method of constructing a diagonal cable that imparts tension is known.

[0004]

However, in order to fix both ends of the diagonal cable 1, it is necessary to cut the covering material and peel it off without damaging the core material. The peeling work is troublesome and the construction period is long.

In addition, it is necessary to remove the covering material of the fixing portion of the cable at the factory in advance as a measure for rust prevention until the cable is actually installed and a measure for preventing damage to the exposed core material. It took time and labor, and in any case, there was a problem to be solved.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cable covering structure that facilitates the work of peeling the covering material from the fixing portion of a diagonal cable.

[0007]

The object of the present invention to solve the above-mentioned problems and achieve the above-mentioned objects is to coat a strand of PC steel or a core of PC steel with a coating material made of synthetic resin. In this cable, a release material is interposed between the surface of the core material and the inner surface of the coating material in a portion that is scheduled to be cut in advance.

The release material is a tape made of paper or cloth wound around a core material, and is grease or wax.

[0009]

According to the cable sheathing structure of the present invention, the stripping operation of the sheathing material is facilitated at the cable erection site,
In addition, the core material is prevented from being damaged by the peeling work.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. The first embodiment of the cable covering structure according to the present invention is, as shown in FIG.
In the location 1a corresponding to the fixing portion in the
Tape 4 made of paper or cloth on the core 4 made of steel strands
Is wound as a peeling material, and a synthetic resin coating material 6 such as PE is integrally coated thereon.

A portion 1a corresponding to the fixing portion of the cable 1 is slightly considering the distance between the main tower 2 and the main girder 3 of the cable-stayed bridge A in which the cable is installed and used and the length of the fixing portion. It is set with a margin of.

In addition, a portion other than the portion 1a corresponding to the fixing portion has a normal cable structure.
As shown in (1), the core material 4 is integrally covered with the covering material 6 made of synthetic resin.

The diameter of the portion 1a corresponding to the fixing portion and the diameter of the other cable portion are the same so that they can be wound on a drum for transportation. Further, in manufacturing the cable, the coating material 6 is formed by continuously forming the portion 1a corresponding to the fixing portion and the other portions.

When the cable 1 is installed, a work of peeling off the synthetic resin coating material 6 at the portion 1a corresponding to the fixing portion is carried out.

In the peeling work, the tape 5 cuts the joint between the core material 4 of the cable 1 and the covering material 6,
The covering material 6 is easily peeled off, and the work efficiency is greatly improved.

Thereafter, the core material 4 in the peeled portion is fixed by a wedge by the anchor head in the fixing portion.

The second embodiment of the present invention is, as shown in FIG. 3, a case where the core material 4 is formed of zinc-plated or zinc-aluminum-plated PC steel material.

The third embodiment of the present invention is formed by enclosing a large amount of grease or wax as a peeling material in the portion 1a corresponding to the fixing portion of the cable. By this, the joint between the core material 4 and the covering material 6 of the cable 1 is cut.

The peeling material such as the grease also facilitates the work of peeling the coating material 6 at the fixing portion, improving the working efficiency and also having the rust preventive effect.

[0020]

As described above, the cable covering structure according to the present invention has a structure in which a cable made of PC steel stranded wire or a core material formed by bundling PC steel materials is covered with a synthetic resin covering material in advance. In the portion where is scheduled, a release material is interposed between the surface of the core material and the inner surface of the coating material, and the release material is a tape made of paper or cloth wound around the core material, or Since it is grease or wax, the work of peeling off the covering material on the fixing part of the cable end becomes easy and not only the work efficiency is improved, but also the core material is not damaged and the quality is stable. , The construction period is shortened and the rust prevention performance is maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of a portion corresponding to a fixing portion of a cable according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a cable portion in the first embodiment of the present invention.

FIG. 3 is a sectional view of a cable according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a cable-stayed bridge according to a conventional example.

FIG. 5 is an explanatory view of a part of the cable according to the conventional example.

[Explanation of symbols]

 1 diagonal cable, 1a corresponding to the fixing part of the cable, 2 main towers, 3 main girders, 4 core materials, 5 tapes as release materials, 6 coating materials.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiyoshi Suzuki 12-2 Nibancho, Chiyoda-ku, Tokyo Esu Co., Ltd. (72) Inventor Wataru Ohashi 12-12 Nibancho, Chiyoda-ku, Tokyo Esu Co., Ltd. (72) Inventor Kenji Wako 12-2 Nibancho, Chiyoda-ku, Tokyo Esu Co., Ltd. (72) Inventor Masamitsu Takei 1 Niihamacho, Chuo-ku, Chiba-shi, Chiba Kawatetsu Techno Wire Co., Ltd. (72) Inventor Shoji Shigeo, 1 Shinhamacho, Chuo-ku, Chiba-shi, Chiba, Kawakawa Techno Wire Co., Ltd. Tokuni Tokyo 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. Tokyo head office (72) Inventor Shigeki Nakamura Chiyoda-ku, Tokyo Town 2-chome No. 2 No. 3 Kawasaki Steel Corporation of Tokyo in the head office

Claims (3)

[Claims] 1. A cable formed by coating a strand made of PC steel wire or a bundle of PC steel materials with a covering material made of synthetic resin, and at a portion to be cut in advance, the surface of the core material and the covering. A cable covering structure characterized in that a release material is interposed between the inner surface of the material and the inner surface of the material. 2. The cable covering structure according to claim 1, wherein the release material is a tape made of paper or cloth wound around a core material. 3. The cable covering structure according to claim 1, wherein the release material is grease or wax.