JPS5814803A - Optical communication wire for composite power line and its production - Google Patents

Abstract

PURPOSE:To protect the cores of optical fibers against welding heat by covering the outside circumferences of said cores with prepreg tapes, covering the outside circumferences thereof with metallic tapes and welding the seams. CONSTITUTION:A prepreg tape 5' in a half set sate and a metallic tape 2' are placed successively longitudinally on an optical fiber core 6 wherein the outside circumference of an optical fiber 6A is covered with a protective covering layer 6B consisting of a primary covering layer of silicone rubber, etc., a cushion layer of silicone rubber or the like of good elasticity, and a secondary covering layer of nylon, etc., after which the tapes are formed to a pipe shape with roll forming dies or die forming or the like so that both ends in the width direction of the tape 5' are butted or overlapped, then the seams 3 of the tape 2' are arc welded by a welding electrode 7 to form a metallic pipe 2; at the same time, the tape 5' is thermally set, whereby an optical communication wire 1 for composite power lines is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical communication line for a composite power line in which an optical communication line is combined with an overhead ground wire, an overhead power transmission line, a power cable, etc., and a method for manufacturing the same.

For example, in the case of optical communication lines used in composite power lines consisting of overhead ground wires and optical communication lines, strict conditions must be met such as changes in climate, temperature changes due to energization, or sudden surface temperature changes due to lightning strikes. Must be.

As an optical communication line used for this type of application, one having a structure in which an optical fiber core wire is housed within a metal pipe has been proposed.

For such optical communication lines, it is technically difficult to manufacture a long metal fiber and then insert the optical fiber/four-core wire into it. A method of forming a metal tube and inserting an optical fiber at the same time is being considered, such as applying a tape vertically and welding the joints of the metal tape to form a metal fiber tube3. However, in this manufacturing method, the metal tape has good thermal conductivity, so when welding the joint of the metal tape, the welding heat is transmitted through the metal tape and the optical fiber core (plastic protection is placed around the outer circumference of the optical fiber). There was a drawback that the protective coating (with a coating) was thermally damaged. Another disadvantage is that the protective coating of the optical fiber and core wire is thermally damaged by welding sparks during welding of the joint.

On the other hand, in conventional optical communication lines, the optical fiber core wire is simply housed in a metal wire, so it is difficult to satisfy the severe temperature conditions mentioned above when used in a composite power line. There were drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical communication line for a composite power line and a method for manufacturing the same, which can solve the above-mentioned manufacturing problems and problems during use.

The optical communication line for a composite power line according to the present invention has a hardened Noripreg tape layer on the inner surface of a metal pipe, and has a structure in which an optical fiber core is housed within the Noripreg tape layer. It has become.

The method for manufacturing an optical communication line for a composite power line according to the present invention includes stacking Noripreg tape on a metal tape, covering the optical fiber core wire longitudinally, and surrounding and protecting the outer periphery of the optical fiber core wire with a Noripreg tape layer. The seam of the metal tape is welded in this state.

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

FIG. 1 shows a first embodiment of an optical communication line 1 for a composite power line according to the present invention. This optical communication line 1 has a metal motherboard 2 in which a metal tape 2' such as an aluminum tape is rolled up so that both ends in the width direction butt together, and the seam is connected and sealed with a welding part 3. It has a layer 5 of Noripreg tape 5' in a cured state, and has a structure in which a cored optical fiber 6 is housed within the Noripreg tape layer 5. Noripreguchie F5' is made by impregnating and coating a layer of reinforcing fibers such as glass fiber with a thermosetting resin such as epoxy resin, molding it into a tape shape, and semi-curing the thermosetting resin, making it flexible. It has good properties and is non-sticky. In this example, Noripreguchi f5
' have their widthwise ends butted against each other. Such Noripreg tape layer 5 is heated and hardened.

The optical fiber core 6 has a layered structure in which the outer periphery of the optical fiber 6A is provided with a protective coating 6B consisting of a primary coating layer such as silicone rubber, a buffer layer such as highly elastic silicone rubber, and a secondary coating layer such as nylon. It has become.

When such an optical inspection line 1 is exposed to heat through the metal/fino 2 during use, the Noripreg tape layer 5 acts as a heat shielding layer and protects the optical fiber core 6 from heat. do.

FIG. 2 shows the second diagram of the optical communication kA1 for composite power line according to the present invention.
This shows an example. This optical communication line 1 differs from the first embodiment only in that it has an overlapping portion 5A in which both ends of the Noripreguchi f 5' in the width direction are overlapped, and other points are the same as in the first embodiment. It is formed.

Such an optical communication line 1 can also obtain the same effects as the first embodiment. Particularly, according to this embodiment, as will be described later, it is possible to obtain effects superior to those of the first embodiment during manufacturing.

FIG. 3 shows a specific example of the method for manufacturing the optical communication line 1 for a composite power line of the present invention described above. As shown in the figure, when the optical fiber core a6 is supplied at a predetermined speed, the glue preglue f5' and the metal chip 7 are applied to the optical fiber core #6.
2' are stacked vertically in an overlapping state with the glue preg tape 5' facing upward, and are successively formed into a pipe shape by roll forming, die forming, or the like. At this time, both ends of the Noripreg tape 5' in the width direction are abutted (5) as shown in FIG. 1, or are overlapped as shown in FIG.

In this manner, with the outer periphery of the optical fiber core 6 surrounded by the grille tape, the joints of the metal tapes 2' are sequentially arc-welded by the welding electrode 7, and metal holes 4 and 2 are successively formed. When welding the seams of the metal chips f2', the outer periphery of the optical fiber core wire 6 is covered with Noripreg tape 5.
′, so even if the metal tape 2′ is heated by welding heat, the heat is shielded by the Noripreg tape 5′, and the heat is prevented from directly being transmitted to the optical fiber core wire 6. and protects the optical fiber core wire 6 from welding heat.

At this time, the prepreg chip f5' is thermally cured.

Also, during welding, sparks try to enter the inner side from the joint of the metal tip f2', but since the Noripreg tape layer 5 exists on the inner side and can trace the welding sparks, the optical fiber core wire 6 is caused by the welding sparks. It cannot be damaged.

In particular, when both ends of the Noripreg tape 5' in the width direction are overlapped as shown in FIG.
The seam '' is reliably closed, and welding sparks can be reliably prevented from entering. Thus, (6) according to the present invention, the optical fiber core wire 6 can be protected from welding heat and welding sparks during bath welding.

FIG. 4 shows a specific example of a composite stranded wire 8 for a power transmission line with multiple optical communication lines as an example of a composite power line using the optical communication line 1 of the present invention. The composite stranded wire 8 is constructed by twisting together a plurality of metal wires 9 such as aluminum I-wires around the optical communication wire 1 of the present invention.

Such a composite stranded wire 8 can be used, for example, as an overhead ground wire or an overhead power transmission line, and the optical fiber core wire 6 can be used to perform communication between substations, etc. without suffering from induction interference. Further, as described above, the optical communication line l in the composite twisted lss has a heat shielding wall such as the glue preg tape layer 5 on the inside of the metal wire 2, so that the optical fiber core wire 6 is protected from heat. be able to.

FIG. 5 shows a specific example of an optical communication line-input composite power cable 10 as another example of a composite power line using the optical communication line 1 of the present invention. This composite power cable lO is 3
It has a structure in which strips of insulated electricity 1s11 are twisted together, the optical communication line 1 of the present invention is interposed in the gap between them, and a cable sheath 13 is applied to the outer periphery via a presser winding 12.

Even in such a composite power cable IO, the same effects as in the embodiment shown in FIG. 4 can be obtained.

As explained above, in the optical communication line for composite power line according to the present invention, metal A? There is a hardened Noripreg tape layer between the fiber optic cable and the optical fiber core wire, and this Noripreg layer surrounds the optical fiber core wire as a heat shielding layer. Can be protected from temperature. In addition, by providing a hardened Noripreg tape layer on the inner surface of the metal/mother pipe, even if the thickness of the metal pipe is made thinner, it can be reinforced with the hardened Noripreg tape layer, ensuring the optical fiber core. can be protected.

Furthermore, if the thickness of the metal/mother tube can be made thinner, the metal tape will not be thinner and molding can be easily carried out in a state in which glue preg tubes are overlapped. Next, in the manufacturing method of the present invention, the outer periphery of the optical fiber core wire is surrounded by a Noripreg tape layer, and the seam of the metal tape on the outer periphery is welded, so that the metal tape is heated by the welding heat. The heat is also shielded by the Noripreg chive, and the optical fiber can be protected from the welding heat. In addition, when welding the joints of metal tubes, welding sparks enter the inside of the joints, but there is a Noripreg tape layer on the inside to prevent the welding sparks from entering, so the optical fiber core wire is protected from welding sparks. It can prevent damage. Furthermore, since the Noripreg tape layer is applied vertically together with the metal tape when it is applied vertically, it is convenient and requires no effort.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing two examples of the optical communication line according to the present invention, FIG. 3 is an explanatory diagram showing an example of the method for manufacturing the optical communication line according to the invention, FIG. 5 is a cross-sectional view showing two types of composite power lines using optical communication lines according to the present invention.

Claims (2)

[Claims] (1) A light for composite power line characterized by having a prepreg tape layer in a hardened state on the inner surface of the metal or insulator, and having a 4-core optical 7-aino wire housed within the prepreg tape layer. communication line. (2) A prepreg tape is stacked on a metal tape to cover the optical fiber core wire longitudinally, and the seams of the metal tubes are welded while the outer periphery of the optical fiber core wire is surrounded by the prepreg tape. A method for manufacturing an optical communication line for a composite power line.