JP2002017028A - Cable laying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable laying method which can stably hold a cable after it is laid without generation of wind noise and swing of cable. SOLUTION: A supporting wire 2 is previously laid between poles 1a and 1b, a coil 3 is then externally inserted to this supporting wire 2, and one end 3a of the coil 3 is fixed to one pole 1a. A cable 5 is then inserted into the internal side of the coil 3, it is tensioned between poles 1a, 1b and it is then fixed temporarily. The supporting wire 2 and the cable 5 are closely bound with the coil 3 by pulling the other end 3b of the coil 3 toward the other pole 1b along the supporting wire 2 and cable 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of laying cables such as electric and communication lines between telephone poles, and more particularly to improving the safety and efficiency of the erection work as compared with the related art. Also, the present invention relates to a cable erection method capable of stably holding and fixing the erected cable without the cable or coil being subjected to frictional damage and having excellent erection durability.

[0002]

2. Description of the Related Art Conventionally, as a method of laying a cable between electric wires, a method shown in FIGS. 3 and 4 is known.

[0003] In the method shown in FIG. 3, a cable B is laid along a support line A previously stretched between utility poles, and then a hanging tool T called a metal hanger coated with plastic or rubber is used. In this method, the cable B is suspended and fixed to the support wire A by arranging the suspending tools T at regular intervals in the longitudinal direction.

However, in the erection work according to this method, the worker moves up in the longitudinal direction of the support line A by climbing to a high place using a spacecraft or an aerial work vehicle or hanging directly on the support line A. However, since the hanging tool T is attached to the support wire A and the cable CB bundle, the operation is extremely dangerous, and there is a problem that the operation efficiency is poor.

The method shown in FIG. 4 is intended to improve the work at a high place. A coil C made of a synthetic resin is used instead of the above-mentioned hanging tool T, and the wire is previously stretched between electric wires. The coil C is extrapolated to the support wire A, and one end of the coil C is fixed to one of the electric wires. Then, one end of the cable 2 is inserted into the space of the coil C so that the end of the coil C and the cable B This is a method of suspending the cable B on the support wire A via the coil C by simultaneously stretching the end of the cable C to the other power pole side and fixing the other end of the coil C to the other power pole side. In other words, this method is a method in which the coil C also functions as a cable suspending device and a cable passing device. It is a method that has made it possible.

However, in this method, as shown in FIG. 4, the cable B is erected with a gap S between the support wire A and the cable B for the purpose of erection of multiple cables. The cable B oscillates due to the wind and becomes entangled with the support wire, and the cable and coil are liable to frictional damage due to the swinging, twisting, and rubbing of the installed cable B. There was a problem that the properties were poor.

[0007]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying solving the problems in the above-mentioned prior art, particularly the method of laying a cable shown in FIG.

Accordingly, an object of the present invention is to further improve the safety and work efficiency of the erection work as compared with the related art, to prevent the cables and coils from being damaged by friction and to have excellent erection durability, and to provide a cable after erection. Is to provide a cable erection method that can stably hold and fix the cable.

[0009]

In order to achieve the above object, according to the cable laying method of the present invention, when a cable is laid along a support line, a coil is attached to a support line previously laid between telephone poles. After inserting the cable inside the coil, the other end of the coil is pulled toward the other telephone pole along the support line, so that the coil closely contacts the support line and the cable. It is characterized by being wound.

In the cable laying method of the present invention, the cable laying operation is repeated between desired power poles adjacent to each other between the power poles, so that the cable laying work is performed over all the power poles requiring the cable laying. Cables can be erected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings.

FIGS. 1A to 1D are explanatory views showing an example of a method of erection of a cable according to the present invention in the order of steps.

When the method of laying a cable according to the present invention is carried out, first, as shown in FIG.
A support wire 2 is installed between a and 1b, a coil 3 is extrapolated to the support wire 2, and one end 3a of the coil 3 is
It is fixed to the support wire 2 located on the side a by the fixture 4a.

Next, as shown in FIG. 1 (B), a cable 5 is inserted inside the coil 3, and this cable 5 is extended between the utility poles 1a and 1b along the support wire 2, and 1
a, 1b are temporarily fixed by fixtures 5a, 5b. The other end 3b of the coil 3 disposed between the utility poles 1a and 1b and pulled to some extent toward the other utility pole 1b corresponding to the extension of the cable 3 is connected to the support wire 2 located on the other utility pole 1b side. Temporarily fix with the fixture 4b.

Next, as shown in FIG. 1 (C), the cable 5 inserted in the coil 3 disposed between the adjacent power poles 1b and 1c is moved along the support wire 2 between the power poles 1b and 1c. The wire is extended and temporarily fixed to the utility poles 1b and 1c with fixtures 5b and 5c. The other end 3b of the coil 3 disposed between the utility poles 1b and 1c and pulled to some extent toward the other utility pole 1c corresponding to the extension of the cable 3 is connected to the support wire 2 located on the other utility pole 1c side. Temporarily fix with the fixture 4c.

Subsequently, as shown in FIG.
The temporary fixation of the other end 3b of each coil 3 is unwound, and this is pulled along the support wire 2 and the cable 5 to the other poles 1b and 1c, respectively, so that the coil 3 and the support wire 2 The cable 4 is brought into a tightly wound state, and in this state, the other end 3b of each coil 3 is fixed to the supporting wire 3 located on the other electric pole 1b, 1c side with a fixing tool 4b, respectively. The work of laying the cable 4 between 1b and 1b-1c is completed.

In the above description, the means for fixing or temporarily fixing both ends of the coil 3 includes a method in which the coil 3 is directly fixed to the support wire 2 with a metal clamp, a bolcon, or the like. After inserting the cable into the coil extrapolated to the wire, the end of the cable and the other end of the coil may be simultaneously pulled along the support wire toward the other pole, or the end of the cable The cable may be extended by connecting a pulling line to the cable and pulling the pulling line.

Then, as a result of the above-described erection work, as shown in FIG. 2, the support wire 2 and the cable 5 are tightly wound via the coil 3, so that the conventional gap is eliminated.
The cable 5 does not swing due to the wind and is entangled with the support wire 2, and the cable 5 and the coil 3 are not subjected to frictional damage due to the swing, torsion, rubbing, etc. of the installed cable 5. In addition, the cable after erection can be stably held and fixed.

Further, since the coil is made of a synthetic resin as a basic material, the coil is significantly reduced in weight, so that work safety and work efficiency can be improved. With a single operation of extending the coil between the utility poles together with the cable, the cable can be fixedly suspended at a fixed interval with respect to the support wire. It becomes unnecessary, so that labor can be reduced and working time can be shortened, and the workability of cable installation can be significantly improved.

The coil used in the present invention is preferably made of a synthetic resin monofilament or a stranded wire obtained by twisting a plurality of synthetic resin monofilaments.

The coil used in the present invention may be composed of a composite linear body of a metal wire and a synthetic resin or a stranded wire obtained by twisting a plurality of composite linear bodies. Even if the synthetic resin part of the coil burns down due to a fire, the metal wire remains without burning down and can maintain the erected state of the cable. it can.

Here, the synthetic resin material used for the coil is not particularly limited, and examples thereof include thermoplastic resins such as polyester, polyamide, and polyolefin.

These thermoplastic resins can optionally contain ordinary additives such as a heat-resistant agent, a weathering agent, a light-proofing agent, an antioxidant, an antistatic agent, a leveling agent, a dye and a pigment.

The composite linear body may be formed in the longitudinal direction of the outer periphery of a coated metal wire in which the outer periphery of a metal wire is coated with a synthetic resin, a stranded wire in which a synthetic resin monofilament is twisted with a metal wire, and a synthetic resin monofilament. And a metal-fitted resin wire in which a metal wire is fitted in the groove.

The metal wire used in the composite linear body has a diameter of 0.5 to 5.0 mm, preferably 1.0 to 5.0 mm.
A single wire such as a 4.0 mm steel wire, iron wire or aluminum wire or a stranded wire obtained by twisting a plurality of single wires is used.

The cross-sectional shape of the synthetic resin monofilament or the composite linear material forming the coil is not particularly limited, and may take various forms such as a circle, an ellipse, a triangle, a quadrangle, and a multilobe. obtain.

The thickness of the synthetic resin monofilament, the stranded wire composed of the same, the composite linear body and the stranded wire composed of the same are 1.0 to 10.0 m as the circumscribed circle diameter of the cross section.
m, preferably in the range of 3.0 to 7.0 mm, whereby optimum rigidity, strong strength and elasticity of elasticity as a cable erection coil can be obtained. It can be advantageous.

When a plurality of linear bodies are twisted into a stranded wire, the number of strands is preferably 3 to 4, and the number of twists in this case is preferably in the range of 10 to 40 T / M.

Instead of twisting a plurality of synthetic resin monofilaments or composite filaments, a single twisted twisted wire may be used as a coil material. In this case, the number of twists is 10 ~ 40T /
The range of M is preferred.

The synthetic resin monofilament and the synthetic resin monofilament forming the composite linear body are preferably drawn yarns obtained by melting and discharging the synthetic resin from a die having a desired shape and then drawing.

The synthetic resin-coated metal wire, which is one type of composite linear body, is formed by running the metal wire around the center of a die for melting and discharging the synthetic resin, and coating the surface of the metal wire with a predetermined amount of the synthetic resin. It can be manufactured by a method similar to the conventional wire coating method of cooling and winding. In this case, if the shape of the die is changed to an irregular shape,
A composite linear body having an irregular cross section such as a square cross section can be manufactured.

In the case of a stranded wire obtained by twisting a plurality of wire bodies or a stranded single wire, the wire bodies are preheated to a temperature near the melting point of the synthetic resin and twisted or twisted with each other. Can be manufactured.

As a method of forming a continuous helical coil from the synthetic resin monofilament, the composite linear body, and the stranded wire obtained by twisting a plurality of these, generally, a single wire or a stranded wire is formed by melting the material near the melting point of the material resin. It can be produced by preheating to a temperature, spirally winding it around a mandrel having an outer shape equal to the desired coil diameter and heat setting.

Since the coil used in the present invention is stretched until it becomes substantially linear, if the heat fixation is too strong, the pitch is good, but
Exceeding a certain stretching limit will result in coil reversal. Therefore, in the coil manufacturing process, by optimizing the heat setting conditions,
It is a preferable condition to set a temperature range in which the inversion phenomenon of the coil does not occur even if the coil is extended to a substantially linear state.

The diameter of the coil when it is not extended is 20 to 2 mm.
It is preferable to set the range to 00 mm.

[0036]

As described above, according to the method for laying a cable according to the present invention, the support wire and the cable are tightly wound via the coil. Cables and coils are not subject to friction damage due to swinging, twisting, rubbing, etc. of the installed cable due to swinging due to the wind, and the cable after installation is It can be held and fixed stably.

Further, since the coil is made of a synthetic resin as a basic material, the coil is significantly reduced in weight, so that not only the safety of work and the work efficiency can be improved, but also a cable hanging member and a penetrating member can be attached to the coil. With a single operation of extending the coil between the utility poles together with the cable, the cable can be fixedly suspended at a fixed interval with respect to the support wire. It becomes unnecessary, so that labor and work time can be reduced, and the workability of cable installation can be significantly improved.

[Brief description of the drawings]

FIGS. 1A to 1D are explanatory views showing an example of a method of erection of a cable according to the present invention in the order of steps.

FIG. 2 is a front view showing a state after erection of a cable is completed by the method of FIG. 1;

FIG. 3 is a front view showing a state in which a cable is laid according to a conventional cable laying method.

FIG. 4 is a front view showing a state in which a cable is laid according to another conventional cable laying method.

[Explanation of symbols]

 1a, 1b, 1c utility pole 2 support wire 3 coil 4a, 4b fixture 5 cable

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Super Asai 1 Kawara, Showa-cho, Okazaki City, Aichi Prefecture Toray Monofilament Co., Ltd. F-term (reference) 5G367 GA03 GB03 GC03 GC03 GC06

Claims (3)

[Claims] When a cable is laid along a support line, a coil is extrapolated to a support line previously laid between telephone poles,
After inserting the cable inside the coil, the other end of the coil is pulled along the support line toward the other power pole, whereby the coil tightly winds the support line and the cable. A method for laying a cable, characterized in that it is in a state. 2. The method according to claim 1, wherein the coil comprises a synthetic resin monofilament or a stranded wire obtained by twisting a plurality of synthetic resin monofilaments. 3. The cable erection according to claim 1, wherein the coil is formed of a composite linear body of a metal wire and a synthetic resin or a stranded wire obtained by twisting a plurality of composite linear bodies. Method.