JPH11337782A - Optical composite cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical composite cable which has both functions of optical communication and transmission of an electric signal or electric power and for which reducing of its diameter and its weight is attained by winding an aluminum pipe which houses an optical fiber and has an insulative pipe sheath around a hard copper wire having a copper wire sheath. SOLUTION: This optical composite cable is obtd. by manufacturing the aluminum pipe 3 while housing an optical unit 2, then forming the pipe sheath 5 on its circumference and forming a copper wire sheath 4 on the circumference of the hard copper wire 1 aside therefrom, then winding the aluminum pipe 3 around the hard copper wire 1. The winding pitch of the aluminum pipe 3 onto the hard copper wire 1 is preferably about 350 to 500 mm. One set of the transmission line is constituted by the hard copper wire 1 and the aluminum pipe 3 with this optical composite cable and, therefore, the transmission of the electric signal and electric power is executed by using such cable and since the optical unit 2 is housed in the aluminum pipe 3, a light signal is transmitted by using the optical unit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical composite cable comprising an optical fiber and a power transmission line, wherein optical communication and transmission of an electric signal or electric power can be performed with a single cable.

[0002]

2. Description of the Related Art For example, when an amplifier or a modulator is inserted in the middle of an overhead communication network constructed by optical cables or the like, it is necessary to supply power to the equipment. For this reason, a method of laying a power supply line separately from the optical cable, or housing the power supply line in the cable is used.

[0003]

However, when a power line is laid separately from an optical cable, two cables are laid, so that there is a problem that the cable cost and the construction cost are doubled. . In addition, when the power cable is housed in the optical cable, the outer diameter becomes large. For example, the outer diameter of an optical cable having about 24 cores is about 20 mm. In addition, since the weight becomes heavy, there is an inconvenience that it becomes difficult to handle and the construction cost increases.

The present invention has been made in view of the above circumstances, and provides an optical composite cable having both functions of optical communication and transmission of an electric signal or electric power, and capable of achieving reduction in diameter and weight. The purpose is to do.

[0005]

The above object can be attained by an optical composite cable in which an aluminum pipe containing an optical fiber and a hard copper wire are integrated. Specifically, an aluminum pipe containing an optical fiber and having an insulating pipe sheath can be wound around a hard copper wire having a copper wire sheath made of a resin to which a rust inhibitor has been added. Alternatively, an aluminum pipe containing an optical fiber and having an insulating pipe sheath and a hard copper wire may be collectively covered with a collective sheath made of a resin to which a rust inhibitor is added.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 is a sectional view showing a first embodiment of the optical composite cable of the present invention. The optical composite cable of this embodiment is a hard copper wire 1
, An aluminum pipe 3 containing the optical unit 2 is wound therearound. As the hard copper wire 1, one generally used as a conductor of an overhead transmission line or an overhead communication line can be used. A copper wire sheath 4 is provided on the periphery of the hard copper wire 1 by extrusion coating of a resin. As a material of the copper wire sheath 4, polyethylene such as low-density polyethylene, medium-density polyethylene, and high-density polyethylene is preferable, and a rust preventive is added to this and used. Benzotriazoles are preferably used as rust inhibitors.
If the amount of the benzotriazole is too small, the rust-preventing effect cannot be obtained, and if the amount is too large, the coating is decomposed.
Preferably, it is about 0.8 to 1.0%.

The optical unit 2 is a unit in which a plurality of optical fiber cores are collectively covered with an ultraviolet curable resin or the like. The outer diameter of the optical unit 2 is set according to the number of optical fibers constituting the optical unit. For example, an optical unit 2 having an outer diameter of 2.2 to 2.7 mm including 12 to 24 optical fibers is used. It is preferably used. The aluminum pipe 3 is suitably manufactured by an aluminum conform or welded pipe drawing, and is preferably manufactured while housing the optical unit 2. The inner diameter of the aluminum pipe 3 is preferably set to be larger than the outer diameter of the optical unit 2 housed therein by about 1.5 to 2.5 mm. If the thickness of the aluminum pipe 3 is too small, the mechanical strength is inferior. If the thickness is too large, the material cost and the weight of the cable increase, and preferably about 0.6 to 0.8 mm. A pipe sheath 5 is provided on the circumference of the aluminum pipe 3 by extrusion coating of a resin. The pipe sheath 5 is formed of an insulating layer, and is preferably formed using, for example, polyethylene such as low-density polyethylene, medium-density polyethylene, and high-density polyethylene. Further, the above rust preventive may be appropriately added thereto.

In the optical composite cable of the present embodiment, an aluminum pipe 3 is manufactured while accommodating the optical unit 2 and then a pipe sheath 5 is formed on the circumference thereof. Is formed by forming a copper wire sheath 4 and then winding an aluminum pipe 3 around the hard copper wire 1. The winding pitch of the aluminum pipe 3 around the hard copper wire 1 is
If the diameter is too small, the production linear velocity will decrease and the strain on the optical fiber will increase. If the diameter is too large, the cable body will easily move.

According to the optical composite cable of the present embodiment, a set of transmission lines can be constituted by the hard copper wire 1 and the aluminum pipe 3, so that electric signals and electric power can be transmitted using these. Can be. At the same time, since the optical unit 2 is housed in the aluminum pipe 3, an optical signal can be transmitted using the optical unit 2. Further, since the hard copper wire 1 can withstand the extension tension, it can serve as a support wire, and this optical composite cable can be wired overhead. The hard copper wire 1 also serves as a power line and a support wire,
Since the aluminum pipe 3 also serves as a power transmission line and a housing member for the optical unit 2, it is possible to reduce the diameter and weight of the cable. Further, since the rust inhibitor is added to the resin constituting the copper wire sheath 4, it is possible to prevent the stress corrosion cracking of the hard copper wire 1 which bears the tensile stress when being wired overhead. Further, since the optical composite cable of this embodiment has a simple structure in which an aluminum pipe is wound around a hard copper wire, it is easy to manufacture and can easily perform repair after laying. Such an optical composite cable is, for example, 100
It can be suitably used as a self-supporting overhead cable having both a low-capacity power cable of about V and an optical cable of about 24 cores.

FIG. 2 is a sectional view showing a second embodiment of the optical composite cable according to the present invention. In this figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof may be omitted. The optical composite cable of the present embodiment is schematically configured such that a hard copper wire 1 and an aluminum pipe 3 containing an optical unit 2 are collectively covered with a collective sheath 7. In the present embodiment, a collective sheath 7 is formed directly on the circumference of the hard copper wire 1, and the copper wire sheath 4 in the first embodiment is not provided. In this embodiment, a pipe sheath 6 is provided on the periphery of the aluminum pipe 3 by extrusion coating of a resin. This pipe sheath 6 is made of an insulating layer,
As the material, polyethylene such as low-density polyethylene, medium-density polyethylene, and high-density polyethylene is preferably used. In this embodiment, since the pipe sheath 6 does not directly contact the outside air, it is not necessary to add a rust preventive. As the material of the collective sheath 7, the same material as the copper wire sheath 4 in the first embodiment is preferably used. If the thickness of the collective sheath 7 is too thin, the mechanical strength is deteriorated. If the thickness is too thick, the outer diameter becomes large. You.

The optical composite cable of this embodiment is a state in which an optical unit 2 is accommodated in an aluminum pipe 3 and a hard copper wire 1 is attached in parallel to a pipe sheath 6 provided around the optical unit. Thus, it is obtained by extruding and covering the collective sheath 7 collectively so as to have a circular cross section.

According to the optical composite cable of the present embodiment, the hard copper wire 1 and the aluminum pipe 3 are arranged on the single cable via the insulating pipe sheath 6, so that these hard copper wires 1 A set of transmission lines can be configured with the aluminum pipe 3. Therefore, electric signals and electric power can be transmitted using these, and the optical unit 2 is housed in the aluminum pipe 3, so that the optical unit 2 can be used to transmit optical signals. Further, since the hard copper wire 1 can withstand the extension tension, it can serve as a support wire, and this optical composite cable can be wired overhead. The hard copper wire 1 also serves as a power line and a support wire,
Since the aluminum pipe 3 also serves as a power transmission line and a housing member for the optical unit 2, it is possible to reduce the diameter and weight of the cable. Furthermore, since the rust preventive is added to the resin constituting the collective sheath 7, it is possible to prevent the stress corrosion cracking of the hard copper wire 1 which bears the tensile stress when being wired overhead. Further, since the optical composite cable of this embodiment has a structure in which the hard copper wire and the aluminum pipe are integrated by the collective sheath 7, the handling is easy, and the workability at the time of laying is good. Such an optical composite cable is, for example, 10
It can be suitably used as a self-supporting overhead cable having both a low-capacity power cable of about 0 V and an optical cable of about 24 cores.

[0013]

EXAMPLES Hereinafter, the effects of the present invention will be clarified by showing specific examples. (Example 1) An optical composite cable having the structure shown in FIG. 1 was prepared. As the optical unit 2, an optical fiber having an outer diameter of 2.7 mm, in which 24-core optical fibers are collectively coated with an ultraviolet curable resin, was prepared. The outer diameter of the aluminum pipe 3 is 5.1 mm and the wall thickness is 0.8 mm, which is manufactured while accommodating the optical unit 2 by welding.
Was used. Rust preventive agent E is placed on the circumference of this aluminum pipe 3.
A pipe sheath 5 was formed by extruding and coating a polyethylene resin containing 0.9% of C-41 (trade name, manufactured by Mitsubishi Chemical Corporation). The outer diameter of the pipe sheath 5 was 7.1 mm.
On the other hand, a hard copper wire 1 having an outer diameter of 3.6 mm was prepared, and a resin of the same material as that of the pipe sheath 5 was extruded and coated on the periphery thereof to form a copper wire sheath 4. The outer diameter of the copper wire sheath 4 is 5.
6 mm. The aluminum pipe 3 obtained above was wound around the hard copper wire 1 obtained above at a pitch of 500 mm to obtain an optical composite cable. The thickness of the obtained optical composite cable was 7.1 mm × 12.7 mm.

Embodiment 2 An optical composite cable having the structure shown in FIG. 2 was prepared. The same optical unit 2, aluminum pipe 3, and hard copper wire 1 as in Example 1 were used. First, a polyethylene sheath was formed by extruding and coating a polyethylene resin on the circumference of the aluminum pipe 3. The outer diameter of the pipe sheath 6 was 7.1 mm. This aluminum pipe 3 and hard copper wire 1
Then, a resin of the same material as that of the pipe sheath 5 in Example 1 was extruded and coated on the circumference thereof to form a collective sheath 7, thereby obtaining an optical composite cable. The obtained optical composite cable had a circular cross section and an outer diameter of 11 mm.

When power transmission was performed using the hard copper wire 1 and the aluminum pipe 3 of the optical composite cable obtained in the first and second embodiments, the electrical resistance was 6 ohm / km in each of the embodiments. There was good power transmission. Optical signals were transmitted using the optical unit 2 of the optical composite cable obtained in Example 1 and Example 2. When the mechanical properties of the optical composite cable were tested, it was found that 500 kg /
No increase in light loss occurred at a load of 50 mm. Regarding the impact characteristics, the light loss did not increase even at an impact load of 1 kg · m, and the temperature characteristics were as follows:
Even in a high-temperature atmosphere at 0 ° C., no increase in loss was observed, and it was confirmed that the film had good characteristics.

[0016]

As described above, the optical composite cable of the present invention is formed by integrating an aluminum pipe containing an optical fiber and a hard copper wire. A signal or electric power can be transmitted, and an optical signal can be transmitted by an optical fiber in an aluminum pipe. Further, the hard copper wire can serve as a support wire and can be applied to an overhead wiring.
Therefore, both power transmission and optical transmission can be performed with one cable, and the hard copper wire also serves as the power transmission line and the support wire, and the aluminum pipe also serves as the power transmission line and the housing member of the optical unit. Thus, the diameter and the weight of the cable can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the optical composite cable of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the optical composite cable of the present invention.

[Explanation of symbols]

1: hard copper wire, 2: optical unit (optical fiber), 3: aluminum pipe, 4: copper wire sheath, 5, 6: pipe sheath, 7
… Batch sheath

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Uejima 1440, Mukurosaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant (72) Inventor Suehiro Miyamoto 1440, Misaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant

Claims (3)

[Claims] 1. An optical composite cable, wherein an aluminum pipe containing an optical fiber and a hard copper wire are integrated. 2. An aluminum pipe containing an optical fiber and having an insulating pipe sheath is wound around a hard copper wire having a copper wire sheath made of a resin to which a rust inhibitor is added. Item 7. An optical composite cable according to Item 1. 3. The light according to claim 1, wherein an aluminum pipe containing an optical fiber and having an insulating pipe sheath and a hard copper wire are collectively covered with a collective sheath made of a resin to which a rust inhibitor is added. Composite cable.