JPH0766098B2 - Optical communication line for composite power line and manufacturing method thereof - Google Patents

Description

The present invention relates to an optical communication line for a composite power line in which an overhead ground wire, an overhead power transmission line, a power cable and the like and an optical communication line are combined, and a method for manufacturing the same.

For example, in the case of an optical communication line used as a composite power line consisting of an overhead ground wire and an optical communication line, severe conditions such as climate change, temperature change due to energization, or sudden temperature change due to lightning strike must be satisfied. I have to.

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

Since it is technically difficult to manufacture a long metal pipe and insert the optical fiber core into such an optical communication line, a metal tape such as an aluminum tape is vertically attached to the optical fiber core. A method of simultaneously forming a metal pipe and inserting an optical fiber core wire, which means that a seam of the metal tape is welded while being covered to form a metal pipe, is being studied.

However, in such a manufacturing method, since the metal tape has a good thermal conductivity, the heat at the time of welding the seam of the metal tape is transmitted through the metal tape and the optical fiber core wire (a plastic protective coating is provided on the outer periphery of the optical fiber. It has the drawback that the protective coating (provided) is thermally damaged. Further, there is a drawback that the protective coating of the optical fiber core wire is thermally damaged by welding sparks or the like during welding of the seam.

On the other hand, in the conventional optical communication line, since the optical fiber core wire is simply accommodated in the metal pipe, it is difficult to satisfy the severe temperature condition as described above in the usage state incorporated in the composite power line. There was a flaw.

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 problems in manufacturing and problems in use.

The optical communication line for a composite power line according to the present invention is arranged so that the outer surface comes into contact with the inner surface of a metal pipe formed by molding a metal tape into a pipe shape and welding a seam, and at the time of welding the seam. It has a structure in which heat is applied through a metal pipe and has a prepreg tape layer in a cured state, and an optical fiber core wire is housed in a space surrounded by the prepreg tape layer.

The method for manufacturing an optical communication line for a composite power line according to the present invention is a state in which a prepreg tape is overlaid on a metal tape to vertically cover the optical fiber core wire, and the outer circumference of the optical fiber core wire is surrounded and protected by a prepreg tape layer. A metal pipe is provided on the outer circumference of the optical fiber core wire through the prepreg tape layer by welding the seam of the metal tape with, and the heat at the time of welding is applied to the prepreg tape layer through the metal pipe to cure it. It is characterized by that.

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 pipe 2 in which a metal tape 2'such as an aluminum tape is rolled so that both ends in the width direction thereof are abutted, and a seam is connected and sealed by a welding portion 3, and an inner surface thereof has an outer surface. Have a layer 5 of prepreg tape 5 ′ in a hardened state, which is arranged so that they are in contact with each other, and heat at the time of welding of the seam is applied through a metal pipe. It has a structure in which the fiber core wire 6 is accommodated. The prepreg tape 5'is formed by impregnating a layer of reinforcing fiber such as glass fiber with a thermosetting resin such as epoxy resin, molding the tape into a tape shape, and semi-curing the thermosetting resin. It has the characteristics of being sticky and non-greasy. In this embodiment, both ends of the prepreg tape 5'in the width direction are abutted against each other to form the prepreg tape layer 5. The prepreg tape layer 5 as described above is hardened by being heated by heat applied during welding via the metal pipe 2. The optical fiber core wire 6 has a layered structure in which a protective coating 6B including a primary coating layer such as silicone rubber, a buffer layer such as silicone rubber having good elasticity, and a secondary coating layer such as nylon is provided on the outer circumference of the optical fiber 6A. Has become.

Since the prepreg tape layer 5 in the optical communication line 1 having such a structure is inevitably heated and cured from the outer peripheral side via the metal tape 2 ', the outer surface in contact with the metal pipe 2 is hard and the inner surface is The hardness decreases and softens as it approaches, so that it acts as a reinforcement for the metal pipe 2 on the outer surface side and as a protector for the optical fiber core wire 6 on the inner surface side.

In addition, such an optical communication line 1 has a metal pipe 2 during use.
When heat is applied via the prepreg tape layer 5, the prepreg tape layer 5 acts as a heat shield layer to protect the optical fiber core wire 6 from heat.

FIG. 2 shows a second embodiment of the optical communication line 1 for composite power line according to the present invention. In this optical communication line 1,
The prepreg tape 5'is different from the first embodiment only in that it has an overlapping portion 5A in which both ends in the width direction of the prepreg tape 5'are overlapped with each other, and other points are formed similarly to the first embodiment.

Such an optical communication line 1 can also obtain the same effect as that of the first embodiment. In particular, according to this embodiment, as described later, it is possible to obtain an effect superior to that 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 wire 6 is supplied at a predetermined speed, the prepreg tape 5'and the metal tape 2'are vertically stacked on the optical fiber core wire 6 with the prepreg tape 5'on top. Then, they are sequentially formed into a pipe shape by roll forming or die forming. At this time, both ends of the prepreg tape 5'in the width direction are abutted as shown in FIG. 1 or overlapped as shown in FIG. With the prepreg tape layer 5 formed by pipe-forming the prepreg tape 5'in this manner, the outer periphery of the optical fiber core wire 6 is surrounded, and the seam of the metal tape 2'is sequentially arc-welded by the welding electrode 7. And metal pipe 2
Are sequentially formed. When welding the seam of the metal tape 2 ′, the outer circumference of the optical fiber core wire 6 is surrounded by the prepreg tape layer 5, so that even if the metal pipe 2 is heated by the welding heat, the heat is generated by the prepreg tape layer 5. The heat is shielded by, and the heat is prevented from being transmitted to the optical fiber core wire 6 as it is, and the optical fiber core wire 6 is protected from the welding heat. At this time, the heat at the time of welding is applied to the prepreg tape layer 5 through the metal pipe 2 to be thermoset. Also, sparks try to enter from the joint of the metal tape 2'into the welding, but since the prepreg tape layer 5 exists inside and shields the welding sparks, the welding sparks damage the optical fiber core wire 6. There is no such thing. In particular, when both ends of the prepreg tape 5'in the width direction are overlapped with each other as shown in FIG. 2, the seam of the prepreg tape 5'is surely closed, and welding sparks can be surely prevented from entering. it can. Thus, according to the present invention, the optical fiber core wire 6 can be protected from welding heat and welding sparks during welding.

FIG. 4 shows a concrete example of a composite twisted wire 8 for a power transmission line containing an optical communication line as an example of a composite power line using the optical communication line 1 of the present invention. The composite twisted wire 8 is formed by twisting a plurality of metal wires 9 such as aluminum wires around the outer periphery of the optical communication wire 1 of the present invention.

Such a composite stranded wire 8 can be used as, for example, an overhead ground wire or an overhead power transmission line, and communication between substations and the like can be performed by using the optical fiber core wire 6 without receiving an inductive obstacle. Further, since the optical communication line 1 in the composite twisted wire 8 has the heat shield wall made of the prepreg tape layer 5 inside the metal pipe 2 as described above, the optical fiber core wire 6 can be protected from heat. .

FIG. 5 shows a concrete example of a composite power cable 10 containing an optical communication line as another example of the composite power line using the optical communication line 1 of the present invention. This composite power cable 10 has a structure in which three insulated electric wires 11 are twisted together, the optical communication line 1 of the present invention is interposed in the gap, and a cable sheath 13 is provided on the outer periphery via a press winding 12. There is.

Also in such a composite power cable 10, the same effect as that of the embodiment of FIG. 4 can be obtained.

As described above, according to the optical communication line for a composite power line of the present invention, the following excellent effects can be obtained.

(1a) A metal tape is formed into a pipe shape, and a metal pipe formed by welding a seam and an optical fiber core wire is arranged so that an outer surface of the metal pipe is in contact with an inner surface of the seam. By having the prepreg tape layer in a hardened state by applying heat during welding through the metal pipe, the prepreg tape layer is inevitably heated from the outer peripheral side and hardened, and the outer surface in contact with the metal pipe. Is hard and decreases in hardness as it gets closer to the inner surface, so it has the advantage that it acts as a reinforcement for the metal pipe on the outer surface side and as a protector for the optical fiber core wire on the inner surface side. .

(1b) Since the prepreg tape layer surrounds the optical fiber core as a heat shield layer in the metal pipe, the optical fiber core can be protected from the temperature during use of the composite power line.

(1c) A metal tape is formed into a pipe shape and the outer surface is in contact with the inner surface of the metal pipe formed by welding the seam, and the heat at the time of welding the seam is applied through the metal pipe. Since it has a prepreg tape layer that is in a cured state, it can be reinforced with a prepreg tape layer in a cured state even if the metal pipe is thin.
The optical fiber core wire can be reliably protected.

(1d) If the wall thickness of the metal pipe can be made thin, the metal tape becomes thin, and it can be easily formed even when the prepreg tapes are stacked.

Next, according to the manufacturing method of the present invention, the following excellent effects can be obtained.

(2a) Since the outer circumference of the optical fiber core is surrounded by the prepreg tape, by welding the seam of the metal tape on the outer circumference, a metal pipe is provided on the outer circumference of the optical fiber core through the prepreg tape layer. Even if the metal pipe is heated by the heat during welding, the heat is shielded by the prepreg tape layer, and the optical fiber core wire can be protected from the heat during welding.

(2b) When welding the seam of the metal tape, the welding spark enters from the seam to the inside, but since the prepreg tape layer exists inside the seam to prevent the welding spark from entering, the optical fiber core wire is welded. It can prevent being damaged by sparks.

(2c) The prepreg tape is suitable because it is vertically attached and covered together with the metal tape when it is attached vertically.

(2d) Since the prepreg tape layer is hardened by applying heat during welding through a metal pipe, there is no need to provide a special heat source or heating step, and it can be performed in the welding step, which is economical.

[Brief description of drawings]

1 and 2 are cross-sectional views showing two examples of the optical communication line according to the present invention, and FIG. 3 is an explanatory view showing an example of a method for manufacturing the optical communication line according to the present invention, FIG. 4 and FIG. 5 is a cross-sectional view showing two examples of composite power lines using the optical communication line according to the present invention. 1 ... Optical communication line, 2 '... Metal tape, 2 ... Metal pipe, 3 ... Welded portion, 5' ... Prepreg tape, 5 ...
Prepreg tape layer, 6 ... Optical fiber core wire, 7 ... Welding electrode.

 ─────────────────────────────────────────────────── --- Continuation of front page (56) References JP-A-55-32053 (JP, A) JP-A-54-87237 (JP, A) JP-A-54-134449 (JP, A) JP-A-54- 34844 (JP, A) Actual development Sho 53-55529 (JP, U) Japanese Patent Sho 56-761 (JP, B2)

Claims (2)

[Claims] 1. A metal tape formed into a pipe shape and arranged so that the outer surface is in contact with the inner surface of the metal pipe formed by welding the seams, and the heat at the time of welding the seams is passed through the metal pipe. An optical communication line for a composite power line, comprising: a prepreg tape layer which is cured by being added, and an optical fiber core wire is housed in a space surrounded by the prepreg tape layer. 2. A prepreg tape is laid on a metal tape to vertically cover the optical fiber core wire, and the seam of the metal tape is welded while the outer periphery of the optical fiber core wire is surrounded by the prepreg tape. A composite power line characterized in that a metal pipe is provided on the outer periphery of the optical fiber core wire via a prepreg tape layer, and heat at the time of welding is applied to the prepreg tape layer via the metal pipe to cure the heat. Optical communication line manufacturing method.