JPS63180913A - Terminal part of composite cable - Google Patents

Abstract

PURPOSE:To prevent an optical fiber core from being damaged by the end part of an electric wire at the time of extension by fixing the optical fiber core by means of a fixing member to the end of the electric wire. CONSTITUTION:The optical fiber core 3 having a fiber-reinforced plastic coating is built via a protective tube or the like into the center of the electric wire 2 twisted with the metallic strands of a composite cable 1 at the terminal part of the composite cable. The optical fiber core 3 is led out of the end part of the electric wire 2 at a min. required length and an optical connector 4 is mounted to the front end of the optical fiber core 3. The leading out part of the optical fiber core 3 is fixed to the end of the electric wire 2 by the fixing member 5 such as adhesive agent in the end part of the electric wire 2. A cylindrical extension clamp 6 is fitted to the cable to enclose the end part of the electric wire 2, the exposed part of the optical fiber core 3 and the connector 4 and is fixed to the electric wire 2 by a press contact part 6A, etc. The leading in of the optical fiber core 3 into the electric wire is thereby prevented at the time of extending the cable and, therefore, the damage of the optical fiber core 3 in the end part of the electric wire at the time of the extension is prevented.

Description

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

[Prior Art] A composite cable in which an optical fiber core is built into an electric wire is installed on a steel tower by attaching a wire extension clamp to the end of the wire and connecting a pooling wire to the wire extension clamp. In such a composite cable, the wire is stretched by the tension during stretching, resulting in an insufficient length of the optical fiber core wire and tension being applied to the optical fiber core wire. Extra length of the optical fiber core wire was provided outside to accommodate the extension of the electric wire.

[Problems to be Solved by the Invention] However, if the extra length of the optical fiber core is provided outside the end of the wire, the length of the wire extension clamp attached to the end of the wire will be reduced by the space for storing the extra length. There was a problem in that the cable had to be made longer, which worsened the workability of laying the cable. Further, in this case, since the optical fiber is drawn into the interior from the end of the electric wire during the wire extending operation, there is a problem in that the optical fiber is easily damaged at the edge of the electric wire.

SUMMARY OF THE INVENTION An object of the present invention is to provide an end portion of a composite cable that can prevent the wire stretching clamp from becoming elongated and that does not damage the optical fiber core during wire stretching.

[Means for Solving the Problems] The structure of the present invention for achieving the above object will be explained with reference to FIG. 1 corresponding to an embodiment.
In the terminal portion 7 of the composite cable 1 in which the optical fiber core 3 is built in, the wire optical connector 4 is attached to the end of the optical fiber core 3 led out from the end of the mold 4112, and the wire 2, the optical fiber core 3 is fixed to the end of the electric wire 2 by a fixing member 5, and the optical connector 4 and the fixing part of the optical fiber core 3 are fixed to the end of the electric wire 2. It is characterized in that it is built into the wire extension clamp 6.

[Function 1] By fixing the optical fiber core n3 to the end of the electric wire 2 with the fixing member 5 in this manner, the optical fiber core 3 will not be drawn into the electric wire 2 even if the electric wire 2 is extended during wire extension. Therefore,
There is no need to provide an extra length of the optical fiber core 3 outside the end of the electric wire 2, and there is no need to make the wire extension clamp 6 long. Further, since the optical fiber core wire 3 is not drawn into the electric wire 2 during the wire extension, it is possible to prevent the optical fiber core wire 3 from being damaged at the end of the wire during the wire extension.

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

As shown in FIG. 1, at the terminal part of the composite cable of this embodiment, the composite cable 1 has a fiber-reinforced wire 2 formed by twisting metal wires together through a protection tube (not shown) or the like at the center of the wire 2. It has a structure in which a plastic coated optical fiber core 3 is built-in. An optical fiber coated wire 3 is led out from the end of the electric wire 2 with the minimum necessary length, and the optical fiber coated wire 3
A wire optical connector 4 is attached to the tip of the connector.

At the end of the electric wire 2, a lead-out portion of the optical fiber core 3 is fixed to the end of the electric wire 2 with a fixing member 5 such as an adhesive.

A cylindrical wire clamp 6 is fitted around the end of the electric wire 2, the exposed portion of the optical fiber core 3, and the optical connector 4, and is fixed to the electric wire 2 with a crimp portion 6A or the like. Note that 6B is a pulling eye portion provided at the tip of the wire extension clamp 6.

The composite cable 1 equipped with the terminal portion 7 having such a structure is
A pooling wire is connected to the pooling eye part 6B and extended to the steel tower.

At this time, the electric wire 2 is extended due to the wire tension, but the optical fiber 3
Since it is fixed to the electric wire 2 by the fixing member 5, it cannot be drawn into the electric wire 2. However, as the electric wire 2 is extended, the optical fiber core 3 within the electric wire 2 is subjected to tension, which is not preferable.

Therefore, the part of the electric wire 2 that is far in front of the end portion 7 of the wire is clamped to the tower using a restraining means (not shown), and the wire extension clamp 6 is removed, and the electric wire 2 is fixed as shown in FIG.
When the wire is stretched, it is peeled off by the length of the wire. In this way, the optical fiber core 3 becomes free and is drawn into the electric wire 2 until the tension that was acting on it becomes zero. The stripped and unnecessary portion of the electric wire 2 is cut off to form the state shown in FIG. 3. In this state, although not shown, the next section of the composite cable and the electric wire 2 are connected with a jumper wire, and the optical fiber core 3 is connected.
They are mutually connected by a wire optical connector 4.

[Effects of the Invention] As explained above, in the terminal part of the composite cable according to the present invention, the optical fiber core wire is fixed to the end of the electric wire by the fixing means, so that even if the electric wire is extended during the wire extension, the optical fiber core wire is not fixed. can be prevented from being drawn into the wire. Therefore,
There is no need to provide an extra length of the optical fiber core outside the end of the electric wire, it is possible to prevent the length of the wire extension clamp from increasing, and it is possible to prevent deterioration of the workability of wire extension. Further, according to the present invention, since the optical fiber core is not drawn into the electric wire during the drawing, it is possible to prevent the optical fiber from being damaged at the end of the electric wire during the drawing. Furthermore, since the optical fibers can be connected with connectors, there is no need for a fuser or the like, and there is an advantage that no skill is required.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an embodiment of the terminal part of a composite cable according to the present invention, FIG. 2 is a side view showing the wire stripping process after wire stretching, and FIG. 3 is a cutting of the stripped wire. It is a side view which shows the terminal part of a later composite cable. DESCRIPTION OF SYMBOLS 1... Composite cable, 2... Electric wire, 3... Optical fiber □ core wire, 4... Optical connector, 5... Fixing member,
6...Wire extension clamp. Figure 1 Flute 3 Figure

Claims (1)

[Claims] In a terminal portion of a composite cable in which an optical fiber core wire is built into an electric wire, a wire optical connector is attached to an end portion of the optical fiber core wire led out from the end portion of the electric wire, and the The optical fiber core wire is fixed to the end of the electric wire by a fixing member, and the optical connector and the fixing part of the optical fiber core are built into a wire extension clamp fixed to the end of the electric wire. Terminal section of composite cable.