JPS6148327B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wiring guide used when wiring electric wires etc. to underground pipes, and uses a wiring guide whose bending rigidity and weight per unit length are set within appropriate ranges. This makes it possible to easily guide electric wires, etc. into underground pipes over long distances, which was previously impossible to achieve, and which can be wound onto a reel with a diameter of 2 m or less for convenient transportation and handling. The purpose is to provide the following.

Traditionally, telephone lines and electric cables in urban areas have mainly been wired in the air using utility poles, but as urban functions become more complex, aerial wiring has become more and more popular.
The construction work itself has become difficult to carry out, and various problems have arisen, such as a decline in the beauty of the city, and in recent years, underground pipes have been increasingly used for plumbing work. In this wiring work, it is relatively easy to insert and penetrate the electric wires and telephone wires into the buried pipe as long as the distance between the wiring works is short, several tens of meters. Wiring work has been accomplished by using wires, but as urban functions become more sophisticated, wiring sections now extend beyond 100 meters to longer sections of 200 meters or more. However, when steel wire is used as a wiring guiding tool, the guiding tool lacks the pushing ability, and the guiding tool buckles midway through the process, resulting in the inconvenience that it becomes clogged with the pipe width and cannot be moved. At the same time, the guiding tool itself has a large weight and is inconvenient to handle.

Therefore, in view of the current situation, the present inventors changed the two parameters of the guide tool, bending rigidity and weight, to increase the distance that the guide tool can reach inside the buried pipe. Not only is it possible to run wiring over 300m even in large-diameter concrete pipes, but it is also easy to load and unload onto the truck bed during transportation and work. It can be easily stored on a 2m reel.
The present invention was completed by discovering a guide tool with excellent workability that has bending rigidity and weight that can be handled by humans.

That is, the gist of the present invention is to provide a wiring guide made of a fiber-reinforced plastic rod 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. It is in.

The reinforcing material of the fiber-reinforced plastic rod that constitutes the wiring guide is carbon, silicon carbide, boron, aromatic polyamide, glass, etc., and the matrix resin is epoxy,
It is preferable to use a fiber-reinforced plastic material made of resin such as polyester, phenol, vinyl ester, polyimide, or polyamide.

The fiber-reinforced plastic rod-shaped body constituting the guiding tool of the present invention has a bending rigidity of at least 2×10 ⁶
Kg・mm ² , and bending rigidity is 2×
If a rod-shaped object smaller than 10 ⁶ Kg/ ^mm2 is used as a wiring guiding tool, the guiding tool will buckle inside the buried pipe during long-distance wiring work, resulting in frequent accidents where the wiring cannot proceed. Undesirable. In addition, the weight per unit of this rod-shaped body is preferably 160 g/m or less, particularly 130 to 100 g/m. If the weight per unit exceeds 160 g/m, the guide tool may be pushed into the buried pipe. When the guide tool is pushed in, it bends midway due to its own weight, which causes buckling and often makes it impossible to push the guide tool in, which is undesirable.

The simplest method for making the guiding tool of the present invention is to impregnate the aligned strands of reinforcing fibers with molten or solution resin, and then mold them into a rod-shaped body by pultrusion molding or the like. A crosslinking and curing treatment may be performed.

The shape of the rod-like body of the present invention may be various shapes such as a pipe-like shape, a rectangular column shape, etc. in addition to the above-mentioned hollow rod-like shape, but the reinforcing fibers embedded in this rod-like body at least have a length of It must necessarily include layers arranged in the horizontal direction, and it is difficult to make an efficient wiring guiding device, which is the object of the present invention, from a rod-shaped body without such layers.

In addition, the core material of fiber-reinforced plastic rods is polyamide, polyurethane, polypropylene,
It is also possible to use a rod-shaped body made of polyvinyl chloride, polycarbonate, etc., or a reinforced plastic pipe made of hollow woven fabric.

The present invention is a guide tool made of a highly rigid yet lightweight rod-shaped body mainly made of carbon fiber-reinforced plastic material, so it has better ability to reach long distances inside buried pipes than any guide tool made to date. Not only does it have excellent surface friction and wear resistance, but it also has high strength and excellent creep properties, so it can be wound onto reels with a diameter of less than 2m, which is convenient for work and transportation, and can be stored for long periods of time. Ta.

The present invention will be explained in more detail with reference to Examples below.

Example 1 As a fiber-reinforced plastic material, carbon fibers were impregnated with epoxy resin, and a rod with a solid circular cross section of 10 mm in diameter and a fiber content of 50 volume percent was produced by pultrusion molding, and the flexural rigidity was 5.40. ×10 ⁶
A guide tool having a weight of 122.5 g/m ^per unit length and a weight of 122.5 g/m was prepared. When wiring work was carried out in underground pipes over a distance of 300 m using this guiding tool, no clogging due to buckling of the guiding tool occurred in the pipes, and the wiring work could be carried out extremely easily. In addition, the bending strength of this guide is as high as 150Kg/ ^mm2 .
It is possible to wind up a reel with a diameter of 1m,
It had excellent workability and was convenient for transportation.

Example 2 As shown in Fig. 1, a surface layer 2 of carbon fiber-reinforced plastic made of carbon fiber impregnated with epoxy resin was placed around a core material 1 made of nylon with an outer diameter of 10 mm.
Manufactured by pultrusion into a round bar with a bending rigidity of 5.10×10 ⁶ Kg・mm ² and a weight per unit length of 115.5 mm.
A rod-shaped guiding device of g/m was prepared. When wiring work was carried out using this guiding tool in the same manner as in Example 1, the wiring work could be carried out extremely smoothly and was easy to handle.

Example 3 As shown in Fig. 2, a glass cloth-reinforced plastic hollow body 3 with an outer diameter of 6 mm is used as a core body, and a carbon fiber-reinforced plastic made of carbon fiber and epoxy resin is formed on the surface layer 2 by pultrusion molding to reduce the outer diameter. A guiding tool was formed into a 10 mm round bar shape with a bending rigidity of 5.00 x 10 ⁶ Kg・mm ² and a weight per unit length of 109.8 g/m, and the wiring work was carried out in the same manner as in Example 1. We were able to carry out the wiring work extremely smoothly without any trouble.

Example 4 As shown in Figure 3, a carbon fiber reinforced plastic material made of carbon fiber and epoxy resin was used as the fiber reinforced plastic material, and the outer diameter was 8 mm and the inner diameter was 6 mm.
Three hollow round bars 4 are manufactured by pultrusion, and three of them are bundled together, and a rubber coating layer 5 is provided around them, resulting in a bending rigidity of 5.00×10 ⁶ Kg・mm ² and a weight per unit length of 105.5 g. /m guide tool was obtained. When wiring work was carried out in the same manner as in Example 1 using this guiding tool, the wiring work could be carried out extremely smoothly.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are sectional views of guide tools of Examples 2, 3, and 4, respectively.

Claims (1)

[Claims] 1. A wiring guide made of a fiber-reinforced plastic rod 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.