JPS63287913A - Terminal part of composite cable - Google Patents

Abstract

PURPOSE:To simplify an on-site operation and to enable effective protection of optical fiber strands by housing an optical connector, etc. connected to the respective optical fiber strands of an optical unit in a connector housing and further housing these strands and housing into a clamping means extended from the front end of an electric wire. CONSTITUTION:The respective optical fiber strands of the optical unit 13 led out of the end of the electric wire 2 of a composite cable 1 are reinforced by reinforcing tubes 6 and the optical connector 7 is connected to the front end thereof. The front end part of this connector 7 and the unit 3 is housed in a connector housing and is fixed by a packing and fixing agent 9; further, the surplus part of the housing 8 and the unit 3 is housed in the extended clamping means 13 fixed to the front end part of the electric wire 2, by which a terminal part 14 is formed. The on-site operation of the terminal is simplified and the optical fiber strands are effectively protected by this constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to the terminal portion of a composite cable used as, for example, an overhead power transmission line, an overhead ground wire, or the like.

[Prior art] A composite cable with an optical unit built into the wire is! The tip side of the optical unit led out from the end of the wire is separated into the constituent It optical fiber wires, a common optical connector is attached to the tips of these optical fiber wires, and a common optical connector is attached to the end of the wire. A wire clamp is attached, an optical connector is built into the cylindrical portion of the wire clamp to form a terminal portion, and a pooling wire is connected to the tip of the wire clamp to be installed on a steel tower. In such composite cables, the wires are stretched due to the tension during wire extension, resulting in insufficient length of the optical unit and tension being applied to the optical unit.
An extra length of a predetermined length is provided in the optical unit led out from the end of the F1 wire to cope with the extension of the electric wire.

After the wire extension is completed, the N wires are connected to each other by jumper healds while being held to the steel tower by the holding means, and the optical units are connected to each other by optical connectors. It is preferable to connect the optical units using pre-attached optical connectors in this way, since the optical units can be easily connected in the air.

[Problems to be Solved by the Invention] However, in the terminal part of a composite cable having such a structure, after connecting the optical unit with the optical connector, the connecting part is housed in a junction box to protect it from external forces such as tension and rainwater. This resulted in an increase in on-site work and poor workability. In addition, in such a structure, when each optical fiber is separated from the optical unit, the FR of the optical unit is
Since the P (lI fiber-reinforced plastic) coating and other coatings are removed and the optical fibers are exposed, there are problems in that each optical fiber is easily damaged and easily broken.

SUMMARY OF THE INVENTION An object of the present invention is to provide a terminal portion of a composite cable that can simplify on-site work for protecting an optical connector and can effectively protect bare optical fibers.

Means for Solving Problem E] The structure of the present invention for achieving the above object will be explained with reference to FIGS. 1 to 4 corresponding to the embodiments. An optical unit 3 is formed by the fiber wire 4, and the optical unit 3 is ff1l! At the terminal portion 14 of the composite cable 1 built into J2, the optical unit 3 is led out from the end of the electric wire 2 with a predetermined extra length, and the optical unit led out from the end of the electric wire 2. At the tip of 3, the optical unit 3 is separated into individual optical fiber strands 4 constituting it, and the outer periphery of each separated optical fiber strand 4 is covered with a reinforcing tube 6. An optical connector 7 is attached to the tip of each optical fiber 4 with a tube 6, and the optical connector 7 and 1Fic! A connector housing 8 is attached to the distal end of the optical unit 3 that is not separated into the optical fiber elements 11!4, and the base 6A of the optical unit 3 and each of the reinforcing tubes 6 in the connector housing 8 is fixed to the connector housing 8 with a filling fixing agent 9 filled in the connector housing 8;
At the tip of the tube I2, the extra length of the optical unit 3 existing at the tip and the connector housing 8 are connected to the tube portion 13A.
It is characterized in that the wire extension clamping tool 13 housed inside is fixed.

E effect] The connector housing 8 in the present invention is the optical connector 7
and the tip of the optical unit 3 that is not separated into the optical fiber strands 4 is housed and installed in advance, and the internal optical unit 3 is filled with a filling fixing agent 9 filled in the connector housing 8. Since it is fixed to the connector housing 8, when the optical connectors 7 are connected to each other, the connector housings 8 are also connected to each other, so that the connection box can be omitted. Each optical fiber element 14 separated at the tip of the optical unit 3 is covered with a reinforcing tube 6, and the bases 6A of these reinforcing tubes 6 are fixed with a filling fixing agent 9, so that each optical fiber cable 4 can be effectively can be protected.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, at the terminal portion of the composite cable of this embodiment, the composite cable 1 is held at the center of the electric wire 2 made of twisted metal wires. It has a structure in which an optical unit 3 is built in via a tube (not shown) or the like. The optical unit 3 has an m-structure in which a plurality of optical fiber strands 4 are covered with a protective coating 5 such as FR, P, etc. An optical unit 3 is led out from the end of the electric wire 2 with a predetermined extra length, and the protective liquid Wi5 is removed from the tip of the optical unit 3, and each optical fiber strand 4 constituting the optical unit 3 is removed. Separated. Each of these optical fiber strands 4 is covered with a reinforcing duplex 6 made of plastic or the like. Each optical fiber element I! A common optical connector 7 is attached to the tip of 4. Optical connector 7 and optical fiber element 1! J4
The portion of the optical unit 3 that is not separated into two ends is housed in the connector housing 8. The base inside the connector housing 8 is filled with a fixing agent 9 such as adhesive.
The distal end of the optical unit 3 and the base 6A of the reinforcing tube 6, which have been filled with and have not been separated into optical fiber elements fJ4, are fixed to the connector housing 8 with the filling fixing agent 9. The optical connector 7 is positioned and housed at the tip of the connector housing 8. At the end face of the optical connector 7 and the end of the connector housing 8, pins 10, 11 for alignment with the mating optical connector and the connector housing are provided protrudingly.

Further, on the outer periphery of the tip of the connector housing 8, a nut 12 for coupling with a mating connector is provided so as to be rotatable but not handled. A wire extension clamp 13 is attached to the 1 m2 tip by crimping or the like, and accommodates the extra length of the optical unit 3 and the connector housing 8 in the cylindrical portion 13A. A pulling eye portion 13B is provided at the tip of the wire extension clamp tool 13.

Next, a method of laying the composite cable 1 provided with the terminal portion 14 having such a structure will be explained. Wire extension clamp tool 13
A pooling wire is connected to the pooling eye portion 13B at the tip of the cable, and the composite cable 1 is extended between the steel towers using the pooling wire.

At this time, the electric wire 2 is extended by the wire tension, and the optical unit 3 is gradually drawn into the electric wire 2 accordingly. Therefore, even if the electric wire 2 is extended, no tension is applied to the optical unit 3.

After the wire has been extended, the electric wire 2 is clamped at a portion slightly before the end of the wire with a retaining means (not shown) and held to the steel tower, and the composite cable of the next section and ff1li12 are connected with jumper wires, and the optical unit 3 is connected to the optical They are interconnected by a connector 7 and a connector housing 8.

Further, the connector housing 8 and the electric wire 12 are connected to each other by crimping a protective sleeve or the like to protect the exposed portion of the optical unit 3.

[Effects of the Invention] As explained above, in the terminal part of the composite cable according to the present invention, the optical unit is led out from the end of the electric wire with a predetermined extra length, and each optical unit annexed by the l1iiSS of the optical unit is An optical connector is attached to the fiber wire, and a connector housing that accommodates the optical connector and the optical fiber wire is attached to the distal end of the optical unit that is not separated into the fiber wire, and the optical unit in the connector housing is inserted into the connector housing. Since it is fixed to the connector housing with a filling fixing agent filled with the wire, when connecting mutual optical units with optical connectors after wire extension, the connector housings are also connected to each other, eliminating the need for on-site installation of the junction box. This makes it possible to simplify on-site work. In addition, the extra length of the optical unit and the connector housing led out from the end of the wire are stored in a wire extension clamp attached to the wire, so the optical unit and connector housing may be damaged during wire extension. It is possible to prevent this from happening. Furthermore,
The extra length of the optical unit is stored in R1'lS of the wire extension clamp, so when the wire is extended during wire extension, the extra length of the optical unit can be fed into the wire according to the extension. , it is possible to prevent tension from being applied to the optical unit within the electric wire. Furthermore, in the present invention, each optical fiber strand separated at the tip of the optical unit is covered with a reinforcing tube, and the bases of these reinforcing tubes are fixed with a filling fixing agent to prevent movement. Each optical fiber strand can be effectively protected, and the attachment of a connector can prevent each optical fiber strand from being damaged over time.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing the configuration of an embodiment of the end portion of a composite cable in front of a wire extension clamp device l according to the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 1 is a vertical cross-sectional view showing a schematic configuration of the cable shown in FIG. 1 after a wire-stretching clamp is attached, and FIG. 4 is a vertical cross-sectional view showing the terminal portion of the composite cable of this embodiment after wire-stretching. DESCRIPTION OF SYMBOLS 1... Composite cable, 2... RRI wire, 3... Optical unit, 4... Optical fiber wire, 6... Reinforcement tube, 7... Optical connector, 8... Connector Housing, 9... Filling fixing agent, 13... Wire extension clamp,
14...Terminal section.

Claims (1)

[Claims] An optical unit is formed by multiple optical fiber strands,
In a terminal portion of a composite cable in which the optical unit is built into an electric wire, the optical unit is led out from the end of the electric wire with a predetermined extra length, and the optical unit led out from the end of the electric wire is At the tip, the optical unit is separated into its constituent optical fibers, and each of the separated optical fibers is covered with a reinforcing tube, and each of the optical fibers with the reinforcing tube is covered with a reinforcing tube. An optical connector is attached to the tip of the fiber wire, and a connector housing for accommodating the optical connector and the optical fiber wire is attached to the tip of the optical unit that is not separated into the optical connector and the optical fiber wire. The optical unit and the base of each reinforcing tube are fixed to the connector housing with a fixing agent filled in the connector housing, and the extra length of the optical unit and the connector housing are attached to the tip of the electric wire. An end portion of a composite cable, characterized in that a wire extension clamp is fixed to accommodate the wire in a cylindrical portion.