JP2000115938A - Wiring guide appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause a wiring guide appliance to penetrate into a buried pipe smoothly over a long distance by making the wiring guide appliance of a fiber reinforced plastic wire rod having a flexural rigidity of a specific value or more, and having a diameter whose ratio to the diameter of a reel at the time of its being wound on the reel is a specified value or less. SOLUTION: A fiber reinforced plastic wire rod 1 is composed of a core part 2 made from fiber reinforced plastic being a long rod whose cross section is circular, and a coated layer 3 arranged on its surface, and the coated layer 3 is a coat of high-density polyethylene by injection molding. And it is necessary that a flexural rigidity is 2×106 kg.mm2 or more, and that the ratio of the diameter of the wire rod to that of a reel at the time of its being wound on the reel may be 0.6% or less. Consequently, it is possible to make the wire rod penetrate into a buried pipe over a long distance simply without flexing it, and to house the wire rod in a state of being wound on a reel for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring guide used when wiring an electric wire or an optical fiber to an underground buried pipe. The present invention relates to a wiring guide that can be easily carried.

[0002]

2. Description of the Related Art Conventionally, electric wires and optical fibers for telephones, computer communications, or electric power have been installed by being laid over telephone poles on the ground. In recent years, however, there has been a demand for sophisticated urban functions and beautiful landscapes. , And penetrates through the underground pipe. There are two types of wiring guides used for wiring electric wires and optical fibers in the underground buried pipes: long wire rods and self-propelled robots. It is appropriately selected depending on the location where the pipe is buried and the surrounding conditions.

When a long wire is used as the wiring guide, the wiring guide is first penetrated over all the buried pipes arranged between manholes which are openings on the ground. Next, a steel cable for drawing is attached to one end of the wiring guide, and the wiring guide is pulled back to the other end to pass the cable through the buried pipe between the manholes. Then, the target electric wire or optical fiber is connected to the cable, and the cable is pulled back again to wire the electric wire or optical fiber into the buried pipe between the manholes.

As a wire guide of the above-mentioned wire type, a wire made of bamboo higo is initially used, but as the distance between two manholes becomes longer, a wire made of glass fiber reinforced plastic or carbon fiber is used. Alternatively, a reinforced plastic wire rod reinforced with aramid fiber is used.

A wiring guide using such a fiber reinforced plastic wire is disclosed in, for example, Japanese Patent Publication No. 61-48327. The wiring guide disclosed in this publication uses a fiber reinforced plastic wire having a bending rigidity of 2 × 10 ⁶ kg · mm ² or more and a weight per unit length of 160 g / m or less. As described above, by using a fiber reinforced plastic wire having high rigidity and light weight, it is possible to easily penetrate a long-distance buried pipe which could not be realized in the past.

[0006]

By the way, wire guides of the wire type have to be transported by general-purpose trucks.
It is desirable to take up on a reel having a diameter of 2 m or less. Generally, a wire rod made of fiber reinforced plastic has a high tension, and when it is wound up on a reel and stored, a strong repulsive force acts and it is difficult to handle. In addition, there is a possibility that the wire material may be damaged when wound on a reel, and further, when wound on a reel and stored for a long period of time, creep may occur and the reel may bend, causing the wire to penetrate the buried pipe. Occasionally, problems such as a decrease in workability have occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and can be smoothly penetrated through a buried pipe over a long distance, and has a high strength and is wound on a reel having a diameter of 2 m or less. The object of the present invention is to provide a wiring guide tool made of a fiber reinforced plastic wire rod which is excellent in creep characteristics, hardly bends, and can be stored for a long time in a state of being wound on a reel. And

[0008]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies. As a result, it was found that a difference in creep characteristics is caused by a combination of a reel diameter and a wire diameter in a working environment. I found it. Therefore, experiments were conducted on various combinations of the reel diameter and the wire rod diameter, and a suitable combination of these in consideration of practicality was examined.

In particular, as a typical carbon fiber used as a reinforcing fiber of a fiber reinforced plastic wire, Pyrofil TR30 (Mitsubishi Rayon®) manufactured by Mitsubishi Rayon Co., Ltd. having a strand tensile strength of 360 kg / mm ^2. In recent years, Pyrofil TR50 (Mitsubishi Rayon registered trademark) manufactured by Mitsubishi Rayon Co., Ltd., having a strand tensile strength of 500 kg / mm ² , has been examined by paying attention to the situation in which it is generally used. The present inventors have found a fiber reinforced plastic wire which has good workability and is free from breakage at the time of work or bending at the time of storage, and completed the present invention.

That is, according to the present invention, the bending rigidity is 2 × 10 ⁶ kg.
・ It is more than mm ² and the diameter D of the reel when the reel is stored
The main component of the wiring guide is a fiber reinforced plastic wire having a ratio d / D of the wire diameter d to 0.6% or less.

The wiring guide of the present invention is made of a high-rigidity and lightweight fiber-reinforced plastic wire, and can easily penetrate the buried pipe over a long distance without buckling. Moreover, because it has excellent creep properties,
It can be wound on a reel having a diameter of 2 m or less, which is convenient for work or transportation, and it is hard to bend, so that it can be stored in a state wound on a reel for a long time.

The fiber reinforced plastic wire constituting the wiring guide of the present invention needs to have a bending rigidity of 2 × 10 ⁶ kg · mm ² or more in order to penetrate a pipe such as a buried pipe over a long distance. is there. If the bending stiffness is 2 × 10 ⁶ kg · mm ² or less, the wiring guide may buckle in the buried pipe when penetrating the buried pipe over a long distance, so that there are many accidents in which the wiring guide does not advance. Is not preferred.

Further, it is necessary that the wiring guide tool be wound around a reel having a diameter as small as possible, and stored and transported. Therefore, it is necessary that the ratio d / D of the diameter d of the wire to the diameter D of the reel when the reel is stored, that is, the strain ε is 0.6% or less. If the diameter d of the fiber reinforced plastic wire is increased to increase the strain ε to 0.6% or more in order to improve the penetration performance of the wiring guide in the buried pipe, the wire may be damaged at the time of winding on a reel. Alternatively, if the wire is wound up on a reel and stored or stored for a long period of time, the wire will bend, resulting in poor penetration performance into the buried pipe.

The simplest method for obtaining a fiber-reinforced plastic wire used for the wiring guide is to impregnate a strand in which reinforcing fibers are aligned with a matrix resin in a molten or solution state, and then form a die. A method of forming the wire into a long wire shape by a pultrusion method of curing and shaping inside the wire. In addition, it can be manufactured by various methods for manufacturing a conventional fiber reinforced plastic wire.

[0015] The fiber reinforced plastic wire may be made of carbon fiber, silicon carbide fiber, boron fiber, aromatic polyamide fiber, glass fiber, or the like as the reinforcing fiber. Preferably, the carbon fibers are oriented in the longitudinal direction. Also,
As the matrix resin, it is preferable to use a resin such as epoxy, unsaturated polyester, vinyl ester, phenol, polyimide, and polyamide.

The fiber-reinforced plastic wire of the present invention can have various cross-sectional shapes such as a circular, rectangular, or polygonal cross-sectional shape, and may be a solid or hollow body. . The fiber reinforced plastic wire must always contain at least a layer of reinforcing fibers oriented in the longitudinal direction of the wire, and the wire guide having the object of the present invention is obtained from a wire without such a layer. It is difficult to get the ingredients.

Wiring guides are generally rusted tube walls, mud or soil,
The surface is easily worn or scratched because it is rubbed against pebbles or corners of concrete in manholes. In particular, high-strength wire rods tend to concentrate stress due to such abrasion and scratches, resulting in an extreme decrease in strength. Therefore, the fiber reinforced plastic wire preferably has a long rod-shaped core made of fiber reinforced plastic and a coating layer made of high-density polyethylene, fluorine or silicone resin. The coating layer can be formed by coating the surface of the core with high-density polyethylene, fluorine or silicone resin. The fiber reinforced plastic wire having such a coating layer is hardly worn and hardly scratched, so that the service life of the wire guide can be extended.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below with reference to preferred embodiments. FIG.
1 is a cross-sectional view of a fiber-reinforced plastic wire as a wiring guide tool according to a preferred embodiment of the present invention. The fiber-reinforced plastic wire 1 is formed of a fiber-reinforced plastic core 2 having a long rod shape with a circular cross section, and a coating layer 3 disposed on the surface of the core 2.

The core 2 made of fiber reinforced plastic is a long rod-like body having a solid circular cross section with a diameter φ of 9 mm and a reinforcing fiber content of 60% by volume. Such a rod-shaped body is made of carbon fiber having a strand tensile strength of 360 kg / mm ² (Pyrofil TR50 manufactured by Mitsubishi Rayon Co., Ltd.) as a reinforcing fiber, impregnated with a vinyl ester resin in a tow in which the carbon fiber is aligned, and a pultrusion method. Manufactured by The core 2
Is a layer of high-density polyethylene having a thickness of 1.25 mm, and the rod-shaped body constituting the core 2 was coated with the high-density polyethylene by injection molding. Therefore, the diameter d of the fiber reinforced plastic wire 1
Is 11.5 mm.

The fiber reinforced plastic wire 1 having the core 2 and the coating layer 3 has a bending rigidity of 4.2 × 10 ^6.
kg · mm ² . The ratio d / D of the diameter d of the fiber-reinforced plastic wire 1 to the diameter D of the reel when the fiber-reinforced plastic wire 1 is wound around a reel having a diameter D of 2 m and stored in the reel is 0.575%; The range of the present invention was 0.6% or less.

Using such a fiber-reinforced plastic wire 1 as a wiring guide, a work of wiring an electric wire to a polycon buried pipe having a diameter φ of 250 mm embedded over a distance of 400 m was carried out. Without buckling in the middle, it was possible to penetrate the buried pipe over a long distance of 400 m very easily. Further, when unwinding or winding the wiring guide from the reel, the wiring guide was not damaged, and smooth unwinding and winding on the reel was possible. Further, after winding the wire guide on a reel having a diameter of 2 m and storing the wire guide for a long period of one year or more, when the wire guide was unwound, the wire guide was not bent. And excellent creep characteristics.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fiber reinforced plastic wire according to a preferred embodiment of the present invention.

[Explanation of Signs] 1 Fiber reinforced plastic wire 2 Core 3 Coating layer

Claims (3)

[Claims] 1. A fiber reinforced plastic having a bending rigidity of 2 × 10 ⁶ kg · mm ² or more and a ratio d / D of a diameter d of a wire to a diameter D of a reel when the reel is housed of 0.6% or less. A wiring guide tool comprising a wire. 2. The wiring guide according to claim 1, wherein the fiber reinforced plastic wire uses carbon fiber as a reinforcing fiber, and the carbon fiber is oriented in a longitudinal direction. 3. The fiber-reinforced plastic wire according to claim 1 or 2, wherein the fiber-reinforced plastic wire has a long rod-shaped core made of fiber-reinforced plastic and a coating layer made of high-density polyethylene, fluorine or silicone resin. Wiring guide.