JPH07302518A - Optical-fiber-compounded overhead wire and its manufacture - Google Patents

Abstract

PURPOSE:To provide an optical-fiber-compounded overhead wire with excellent corrosion resistance. CONSTITUTION:An optical-fiber-compouned overhead cable 13 is produced by stranding aluminum-coated steel wires 11 or aluminum-based elemental wires 12 or these aluminum-coated steel wires 11 and the aluminum elemental wires 12 with a plurality of stainless steel pipes 10 in which optical fibers 15 are stored. An aluminum layer 2 is formed in the outer circumference of a stainless steel pipe 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead ground wire cable, and more particularly to an optical fiber composite overhead ground wire and a method for manufacturing the same.

[0002]

2. Description of the Related Art As information demands such as maintenance management are becoming more and more complex as the demand for electricity increases year by year, optical fibers are combined with overhead ground lines of power transmission lines to integrate the functions of transmission lines and communication lines. Optical fiber composite overhead ground wire (OPG
W) has been developed and put into practical use. Various types of structures have been proposed for this OPGW, for example, as shown in FIG.
As shown in FIG. 1, an aluminum-clad steel wire 11 having mechanical strength, an aluminum-based element wire 12 of aluminum or an aluminum alloy having electrical characteristics, and a stainless steel tube 10 accommodating a plurality of fibers 15 are twisted together into a large number. There is a structure in which the fiber 15 can be stored.

[0003]

By the way, in the above-mentioned optical fiber composite overhead ground wire, the sacrificial anode action of a dissimilar metal acts between the stainless steel pipe and the aluminum-covered steel wire or between the stainless steel pipe and the aluminum element wire, and the aluminum surface is There is a problem in that it is corroded and the mechanical and electrical characteristics of the electric wire are significantly impaired. As a method of solving this, there is a case of applying an anticorrosive agent to the gap between the stainless steel pipe and the constituent wire. However, the anticorrosive is hardened and deteriorated in the air, and its effect is lost after 10 years, and the corrosion progresses from that point.

Therefore, the present invention has been made in consideration of such circumstances, and an object thereof is to provide an optical fiber composite overhead ground wire having excellent corrosion resistance and a method for manufacturing the same.

[0005]

In order to achieve the above object, an optical fiber composite overhead ground wire of the present invention comprises an aluminum-covered steel wire or an aluminum-based wire, or an aluminum-covered steel wire or an aluminum-based wire and an optical wire. An optical fiber composite overhead ground wire formed by twisting together a stainless tube containing a fiber, wherein an aluminum layer is provided on the outer circumference of the stainless tube (claim 1).

Also, in the method for manufacturing an optical fiber composite overhead ground wire of the present invention, at least one surface of a stainless steel thin plate is coated with an aluminum layer, and then the stainless steel thin plate is positioned so that the aluminum layer is located on the outer surface thereof. The aluminum-clad stainless steel tube containing the optical fiber is formed by inserting the optical fiber into the tube and forming the aluminum-clad steel wire or aluminum-based wire or these aluminum-covered steel wire and aluminum-based wire. An optical fiber composite overhead ground wire is manufactured by twisting the wires together (claim 2).
In addition, after coating an aluminum layer on at least one surface of a strip-shaped stainless thin plate, the aluminum layer is positioned on the outer side and a plurality of optical fibers and a jelly covering the outer circumference of the optical fiber are inserted inside while the stainless layer is used. Both sides of the thin plate are abutted and gradually formed into a tube shape, and the joining surface of this tube is welded to form an aluminum fiber-covered stainless steel tube with an optical fiber. An optical fiber composite overhead ground wire is manufactured by twisting a wire, or an aluminum-covered steel wire and an aluminum-based element wire (claim 3).

[0007]

[Function] By providing an aluminum layer on the outer circumference of the stainless steel tube, the sacrificial anode action due to the dissimilar metals does not work, and the aluminum coated on the stainless steel tube does not harden and deteriorate like an anticorrosion agent in the atmosphere, so corrosion resistance is improved. It can be improved (Claim 1).

Further, in the case of forming an aluminum-covered stainless steel tube containing an optical fiber, the method of plating the fiber-containing stainless steel tube with aluminum or extruding aluminum on the stainless steel tube exposes the fiber in the stainless steel tube to a high temperature. And significantly deteriorates its performance,
Although it has a large effect on fiber performance, by rolling a stainless steel thin plate coated with an aluminum layer, an aluminum layer can be provided on the outer surface of the stainless tube without applying excessive heat to the fiber, degrading the performance of the optical fiber. It is possible to form an aluminum-clad stainless steel tube containing an optical fiber having an anticorrosion effect without causing it (claim 2).

Further, by filling the jelly between the optical fiber and the inner wall of the tube, the welding heat is not directly transmitted to the optical fiber at the time of welding the joining surface, and the heat transfer to the fiber is suppressed, so that the performance of the optical fiber is improved. Corrosion resistance can be improved without deteriorating (claim 3).

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing an example of a manufacturing apparatus for forming an aluminum-covered stainless steel tube containing the optical fiber of the present invention.

In FIG. 2, reference numeral 1 denotes an aluminum-covered stainless steel thin plate roll, on which a belt-shaped stainless steel thin plate 3 having an aluminum layer 2 previously coated on one side surface is wound. The aluminum-covered stainless steel thin plate 3 is formed so that its width is larger than the desired outer peripheral length of the stainless pipe, and is sequentially sent out from the roll 1 to the molding machine 4.

The molding machine 4 sends the stainless thin plate 3 to be sent.
Is gradually rounded so that the aluminum layer 2 is on the outer side surface, and finally both sides are butted to form a round tube body 5, and this tube body 5 is sent to the welding device 6 and the stainless steel thin plate 3 is attached. It is constructed so that a plurality of optical fibers and jelly are inserted inside this while rolling, and the fiber and jelly are inserted such that a space of 0.5 mm or more, preferably 0.5 to 1.0 mm is provided between the fiber and the inner wall of the tube. To do.
That is, a jelly is filled between the fiber and the inner wall of the tube to leave a space. With this configuration, it is possible to prevent the welding heat in the welding device 6 from being directly applied to the fiber. Further, an introduction pipe 7 for inserting an optical fiber and a jelly is connected to the molding machine 4, the introduction pipe 7 is inserted into the inside of the pipe body 5, and the tip end portion of the welding device 6 is used by the welding device 6. Is extended to the downstream side in the flow direction. By arranging the introduction pipe 7 in this way, it is even more avoided that welding heat is directly applied to the fiber.

The pipe body 5 sent to the welding device 6 is welded at its joint surface to form a pipe, which is a roller die 8.
Then, the aluminum-covered stainless steel tube 9 containing the desired optical fiber is formed. This stainless steel tube 9 has a diameter as small as possible to increase the crush resistance. This is because it is desirable for the optical fiber composite overhead ground wire to have a crushing physical force of about 500 kgf or more when compressed between flat plates with a width of 50 mm as the crushing load due to its own weight, wind pressure load, etc. The outer diameter of the aluminum-covered stainless steel tube 9 coated with the aluminum layer 2 is 2.0 to
Try to keep it to around 3.0 mm.

In this way, the aluminum layer 2 is coated on one surface of the stainless thin plate 3 in advance, the fiber and the jelly are inserted while molding this into a round shape, and the joining surface is welded. Then, by expanding this into a final size, the aluminum layer 2 is formed on the outer peripheral surface of the stainless tube 10 without degrading the performance of the optical fiber.
Can be coated.

That is, when forming the aluminum-covered stainless steel tube 9 containing the optical fiber, the method of plating the fiber-containing stainless tube with aluminum or extruding aluminum onto the stainless tube causes the fiber inside the stainless tube to be exposed to a high temperature. , Its performance is significantly deteriorated,
It has a great influence on the fiber performance. On the other hand, by inserting the optical fiber while rolling the stainless steel thin plate 3 coated with the aluminum layer 2 in advance to form the aluminum-covered stainless steel tube 9 containing the optical fiber, it is possible to apply an unnecessarily high heat to the optical fiber ( The aluminum layer 2 can be coated on the outer peripheral surface of the stainless tube 10 (without applying unnecessary heat history to the fiber), that is, without exposing the fiber to high temperatures. When welding the joint surface,
Although welding heat is applied to the fiber, the fiber is not exposed to high temperature so much that the fiber performance is significantly deteriorated as compared with the aluminum plating or aluminum extrusion method, and the fiber performance is hardly affected. Further, an interval of 0.5 mm or more, preferably about 0.5 to 1.0 mm is provided between the inner wall of the stainless steel pipe and the optical fiber, and an introducing pipe 7 for inserting the optical fiber and the jelly is attached to the pipe body 5 from the welding device 6. By extending to the downstream side in the flow direction, welding heat is not directly applied to the fiber.

Therefore, it is possible to form the aluminum-clad stainless steel tube 9 containing an optical fiber having an anticorrosion effect without deteriorating the performance of the optical fiber.

Then, as shown in FIG. 1, the fiber-containing aluminum-clad stainless steel tube 9 and the aluminum-clad steel wire 11 thus obtained are twisted together, and an aluminum-based material (aluminum or aluminum alloy) is wound around the outer circumference. Etc.) A plurality of aluminum wires 12 which are element wires are twisted together to manufacture an optical fiber composite overhead ground wire 13.

Since the optical fiber composite overhead ground wire 13 uses the fiber-containing aluminum-covered stainless steel tube 9 having a structure in which the aluminum layer 2 is coated on the outer circumference of the stainless steel tube 10, the sacrificial anode action by the dissimilar metals does not work. Since the aluminum layer 2 on the stainless steel tube 10 does not harden and deteriorate in the air like an anticorrosion agent, the corrosion resistance can be improved.

By filling the aluminum-covered stainless steel tube 9 with the jelly 14, the welding heat at the time of welding the joint surface is not directly transmitted to the optical fiber 15, but also the fiber 15 is used.
The stress relaxation effect of is also given. As a result, the internal pressure resistance in the aluminum-covered stainless steel pipe 9 can be increased, and thus the crushing resistance can be further increased.

Further, by increasing the coating thickness of the aluminum layer 2, the conductivity of the aluminum-covered stainless steel tube 9 can be increased, and the electrical characteristics of the optical fiber composite overhead ground wire 13 can be improved. .

In this embodiment, a round fiber-containing aluminum-clad stainless steel tube was manufactured and an optical fiber composite overhead ground wire was obtained using this, but the shape of the aluminum-clad stainless steel tube is not limited to this. For example, as shown in FIG. 3, a fan-shaped aluminum-covered stainless steel tube 16 with an optical fiber is formed, and the fan-shaped stainless steel tube 16 is used to form an optical fiber composite aerial ground as shown in FIG. The line 17 may be formed. In this case, the aluminum-covered steel wire 18 is also formed in a fan shape as shown in the drawing, and the fan-shaped aluminum-covered steel wire 18 is formed.
And a fan-shaped aluminum-clad stainless steel tube 16 and an aluminum element wire 12 are twisted together to form an optical fiber composite overhead ground wire 1
7 is manufactured. In FIG. 4, 19 shows an aluminum covered steel wire.

An optical fiber composite aerial ground wire was obtained by twisting an aluminum-clad stainless steel tube containing an optical fiber, an aluminum-clad steel wire and an aluminum-based element wire, but either an aluminum-clad steel wire or an aluminum-based element wire was obtained. The optical fiber composite overhead ground wire may be manufactured by using one and the aluminum-clad stainless steel tube containing the optical fiber.

[0024]

In summary, according to the present invention, the following effects can be obtained.

(1) By providing the aluminum layer on the outer circumference of the stainless steel pipe, the corrosion resistance can be improved.

(2) A stainless steel thin plate provided with an aluminum layer in advance is formed into a tubular body, and a fiber or a fiber and a jelly are inserted into the tubular body to prevent corrosion of the optical fiber without deteriorating its performance. The aluminum-clad stainless steel tube with the optical fiber can be formed, and the optical fiber composite overhead ground wire with improved corrosion resistance can be manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an optical fiber composite overhead ground wire of the present invention.

FIG. 2 is a configuration diagram showing an example of a manufacturing apparatus for forming an aluminum-covered stainless steel tube containing the optical fiber of the present invention.

FIG. 3 is a cross-sectional view showing a modified example of the aluminum-covered stainless steel tube accommodating the optical fiber of the present invention.

FIG. 4 is a cross-sectional view showing a modified example of the optical fiber composite overhead ground wire of the present invention.

FIG. 5 is a cross-sectional view showing an example of an optical fiber composite overhead ground wire proposed previously.

[Explanation of symbols]

 2 Aluminum layer 10 Stainless tube 11 Aluminum covered steel wire 12 Aluminum-based element wire 13 Optical fiber composite overhead ground wire 15 Optical fiber

Front Page Continuation (72) Inventor Takahiro Yamazaki 4-10-1 Kawajiri-cho, Hitachi-shi, Ibaraki Hitachi Cable Ltd. Toyoura Plant

Claims (3)

[Claims] 1. An aluminum-clad steel wire or an aluminum-based element wire, or an optical fiber composite overhead ground wire formed by twisting an aluminum-covered steel wire and an aluminum-based element wire with a stainless tube containing an optical fiber, wherein the stainless steel tube is used. An optical fiber composite overhead ground wire, characterized in that an aluminum layer is provided on the outer periphery of the. 2. A stainless steel thin plate is coated with an aluminum layer on at least one surface thereof, and thereafter the stainless steel thin plate is molded into a tubular shape so that the aluminum layer is located on the outer side surface, and an optical fiber is inserted into the tubular body. To form an aluminum-clad stainless steel tube containing an optical fiber, and twist the stainless-steel tube with an aluminum-clad steel wire, an aluminum-based element wire, or these aluminum-clad steel wire and an aluminum-based element wire to manufacture an optical fiber composite overhead ground wire A method for manufacturing an optical fiber composite overhead ground wire, comprising: 3. A strip-shaped stainless steel thin plate is coated with an aluminum layer on at least one surface thereof, and then the aluminum layer is positioned on the outer surface and a plurality of optical fibers and a jelly covering the outer periphery of the optical fibers are inserted inside. While gradually abutting the both sides of the stainless thin plate to form a tubular body, the joining surface of the tubular body is welded to form an aluminum fiber-covered stainless steel tube containing an optical fiber, and the stainless steel tube and the aluminum-covered steel wire or A method of manufacturing an optical fiber composite overhead ground wire, which comprises manufacturing an optical fiber composite overhead ground wire by twisting aluminum-based wires or aluminum-coated steel wires and aluminum-based wires.