JPH0963365A - Optical-fiber-built-in overhead wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the number of conductors by housing an optical fiber cable formed by intertwisting plural metallic pipes housing ultraviolet-curing resin optical fiber conductors, in an aliminum pipe, and intertwisting aluminum- covered copper wires on the outer periphery of its outer layer. SOLUTION: Ultraviolet-curing resin optical fiber conductors 2 are housed in plural metallic pipes 3, and plural ultraviolet-curing resin optical fiber conductors are housed in this way. This optical fiber cable 1 is used by being housed in an aliminum pipe 5. Aluminum-covered copper wires 6 are intertwisted on the outer periphery of the aluminum pipe 5, and an optical fiber-built-in overhead wire is constituted. For example, the metallic pipes 3 housing the ultraviolet-curing resin optical fiber conductors by 8 pieces are intertwisted by 7 pieces, and an optical fiber cable is constituted, and this is housed in the aliminum pipe having an inside diameter of 6.5mm. Then, the optical fiber conductors become 56 cores. Though they are 30 cores at its maximum in an overhead using a conventional spacer, since they become 48 cores at its maximum in the one using the optical fiber cable, the number of conductors can be significantly increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber-containing overhead electric wire (for example, an optical fiber-containing overhead power transmission line, an optical fiber-containing overhead ground wire, etc.).

[0002]

2. Description of the Related Art A conventional overhead wire containing an optical fiber has a structure in which a metal wire is twisted around an aluminum pipe containing the optical fiber. The optical fiber housed in the aluminum pipe is housed in a groove of a spacer. ing.

The spacer is usually made of aluminum or aluminum alloy, and its role is to prevent the overhead wire from passing through the gold wheel.
Alternatively, the aluminum pipe is prevented from being deformed by an external force generated when the overhead wire is compressed by a retaining clamp or the like, thereby preventing the optical fiber from being damaged.

Further, there is also used an aerial electric wire containing an optical fiber in which an optical fiber cable is directly housed in an aluminum pipe without using a spacer. This overhead wire containing optical fibers has an advantage that the optical fiber cables can be exchanged because a gap is formed between the optical fibers and the inner surface of the aluminum pipe and the optical fiber cables are built in.

[0005]

However, the conventional overhead wire containing an optical fiber has a problem that the number of optical fiber core wires is insufficient. That is, although the number of optical fiber cores tends to increase with the increase in the amount of information in recent years, the conventional spacers have a maximum of about 30 cores, and the optical fiber cables have a maximum of 48 cores. It was about. Of course, if the outer diameter of the overhead optical cable containing the optical fiber is increased, for example, by increasing the diameter of the aluminum pipe, the outer diameter of the overhead optical cable containing the optical fiber is increased, and the space for storing the optical fiber is expanded. Although the number of fiber core wires can be increased, increasing the outer diameter of the overhead wire causes a problem that conventional accessories (for example, compression clamps) cannot be used. Therefore, how to increase the number of optical fiber core wires without increasing the outer diameter of the overhead wire is an important issue.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides an aerial cable containing an optical fiber which solves the above-mentioned problems, and an optical fiber cable formed by twisting a plurality of metal tubes accommodating an ultraviolet curable resin optical fiber core wire. It is characterized by having a built-in.

The diameter of the ultraviolet curable resin optical fiber core wire is 0.
While the diameter is 25 mm, the diameter of the conventional silicone resin optical fiber core wire is 0.4 mm. As described above, since the ultraviolet curable resin optical fiber core wire is thin, the number of core wires can be increased.

On the other hand, the UV-curable resin optical fiber core wire has a problem that it is weak in strength against external pressure because the protective coating is thin. Therefore, in the present invention, the ultraviolet curable resin optical fiber core wire is housed in the metal tube.
This makes it possible to protect the core fiber of the ultraviolet curable resin optical fiber.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an optical fiber cable 1 used in the present invention. The optical fiber cable 1 is formed by twisting a plurality of metal tubes 3 accommodating an ultraviolet curable resin optical fiber core wire 2.

That is, a plurality of the ultraviolet curable resin optical fiber core wires 2 are housed in the metal tube 3, and thus, seven metal tubes 3 accommodating a plurality of the ultraviolet curable resin optical fiber core wires are twisted together. The optical fiber cable 1 is formed as a result. As shown in FIG. 2, the optical fiber cable 1 is housed in an aluminum pipe 5 for use. An aluminum-coated steel wire 6 is twisted around the outer periphery of the aluminum pipe 5 to form an optical fiber-containing overhead wire.

The metal tube 3 may be made of aluminum, aluminum alloy or the like, but it is preferable to use a stainless tube from the viewpoint of strength. When using a stainless steel pipe, make sure that the outer circumference is covered with aluminum.
It is preferable from the viewpoint of preventing electrolytic corrosion.

[0012]

[Examples] UV curable resin optical fiber core wire (diameter 0.2
An optical fiber cable was constructed by twisting seven metal tubes 3 each containing 8 mm (5 mm) and housed in an aluminum pipe having an inner diameter of 6.5 mm. Therefore, the number of optical fiber cores was 56. Since the maximum number of cores using the conventional spacer is 30 and the maximum number of cores using the optical fiber cable is 48, the number of core wires can be significantly increased.

FIG. 3 shows another embodiment of the present invention. The difference from the above-mentioned embodiment is that the aluminum-coated steel wire 6 having a cross-section segment type is twisted without using an aluminum pipe. The space portion 8 is formed inside and the space portion 8 is formed.
In addition, the optical fiber cable 1 formed by twisting a plurality of metal tubes 3 accommodating the ultraviolet curable resin optical fiber core wire 2 is arranged.

With such a structure, since the aluminum pipe is not used, the cost is low, and the area of the space can be large. Therefore, the number of the ultraviolet curable resin optical fiber core wires can be increased.

In each of the above embodiments, the case where the aluminum-coated steel wire 6 is twisted has been described, but it may be an aluminum wire, an aluminum alloy wire, etc., and the number of twisted layers is not limited to this. There may be two or more layers. Further, it is preferable to apply an anticorrosive material such as grease between the optical fiber cable 1 and the aluminum pipe 5 or the section-section type aluminum-coated steel wire 6. Further, although the optical fiber cable 1 formed by twisting a plurality of metal tubes 3 accommodating the ultraviolet curable resin optical fiber core wire 2 in each of the above-described examples is arranged at the center, the arrangement position of the optical fiber cable 1 is at the center. It is not limited to parts.

[0016]

As described above, the aerial cable with optical fiber according to the present invention has the built-in optical fiber cable formed by twisting a plurality of metal tubes containing the ultraviolet curable resin optical fiber core wire. The number of optical fiber core wires can be increased significantly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an optical fiber cable used in the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of an overhead wire containing an optical fiber according to the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 is an optical fiber cable 2 is an ultraviolet curing resin optical fiber core wire 3 is a metal tube 5 is an aluminum pipe 6 is an aluminum coated steel wire 8 is a space portion

Claims (1)

[Claims] 1. An aerial electric wire containing an optical fiber, which comprises an optical fiber cable formed by twisting a plurality of metal pipes accommodating an ultraviolet curable resin optical fiber core wire.