JPH0442642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a novel overhead wire method for an overhead electric wire in which an optical fiber is housed inside, such as an optical fiber composite overhead ground wire.

[Conventional technology and problems] For example, optical fiber composite overhead ground wire (OPGW)
), it is not possible to run the entire length with a single wire, and as with general power transmission lines, it is necessary to connect the wires in the middle of the line.

In the case of ordinary overhead power transmission lines, wires can be freely connected using connection sleeves when necessary, but in OPGW, in addition to connecting wires to each other, optical fibers must also be connected to each other. Conventional connecting sleeves cannot be used. Therefore, OPGW
There have been some pretty exaggerated connections. That is, FIG. 4 shows the connection status of such OPGW, in which the electric wire 1 is held to the steel tower 30 by the retaining clamp 32, and the extra length 1a of the electric wire 1 is pulled down along the frame 31 of the steel tower 30. Then, the optical fibers were connected inside the optical fiber junction box 33.

To make such a connection, it is first necessary to remove the excess length of the wire, and then the complicated work of fixing the excess length to the tower frame and pulling it down is necessary. Since it must be done at the steel tower, there are restrictions such that even if connection is necessary, the connection cannot be located anywhere other than the steel tower. For this reason, there is a strong demand for a means to freely connect OPGWs with connection sleeves in the same way as ordinary power transmission lines, but to date no proposal for an effective means has been found.

[Purpose of the Invention] The present invention has been made in view of the above-mentioned circumstances, and it does not necessarily require connection with a steel tower as shown in Figure 4, but instead requires connection like a normal overhead power transmission line. It is an object of the present invention to provide a method for connecting an optical fiber composite overhead ground wire, which can be freely connected at a broken point.

[Summary of the Invention] That is, the gist of the present invention is to first crimp a wire extension clamp to a plurality of electric wires, connect the wires, and then extend the wires.
Once the specified wire has been stretched, the wire clamp is pulled down to strip the optical fiber at the end of the wire, and the wires are connected in a straight line using a connection sleeve that has an insertion hole through which the optical fiber can be inserted and exposed to the outside. connection,
The optical fiber exposed to the outside is connected separately, an airtight cover is placed around its outer periphery, and the electric wire is stretched as is.This method allows connections similar to normal power transmission lines without having to connect at a steel tower. This made it possible to implement it.

[Example] This will be explained below based on examples.

FIG. 1 is an explanatory view, partially in section, showing an embodiment of a connecting sleeve that is directly used in carrying out the overhead line method according to the present invention. The connection sleeve 10 has a wire insertion hole 11 for inserting and compressing the step-stripped end of the wire 1, and communicates with the back of the wire insertion hole 11, through which the optical fiber can be inserted and exposed to the outside of the sleeve. It has a sleeve main body having an optical fiber insertion hole 12, and an airtight cover 13 that can airtightly cover the optical fiber when it is exposed.

In order to connect the optical fiber composite electric wire 1 using the connection sleeve 10 configured as described above, the following steps are taken. First, the electric wire 1 is stripped in stages, and the optical fiber 2 of a required length is exposed from the end. The stripped end of the wire is inserted into the wire insertion hole 11 of the sleeve 10, and at the same time, the optical fiber 2 is inserted into the optical fiber insertion hole 12 and pulled out of the sleeve 10. Thus, when the end of the wire is inserted into the wire insertion hole of the sleeve 10 as prescribed, the sleeve is appropriately compressed around the outer circumference of the wire, and a connection similar to a straight connection sleeve for an ordinary overhead power transmission line is made. This ensures sufficient connection strength of the electric wire 1. The optical fiber 2 exposed to the outside is appropriately connected 3 and an airtight cover 13 is applied to the outer periphery thereof. The airtight cover 13 is preferably spherical or rugby ball shaped in consideration of wind resistance, but may have other shapes.
From the viewpoint of workability, it is preferable for the airtight cover 13 to be split into two pieces, as shown in FIG. 3, for example, and to be detachable using bolts 14.
Furthermore, if one of the halves is fixed to the sleeve 10 and a fixing means (not shown) for fixing the optical fiber is provided on this fixed side, the optical fiber can be fixed and extreme bending can be avoided. This can prevent transmission loss from occurring.

The process of wiring an optical fiber composite overhead electric wire using the connection sleeve according to the present invention configured as described above is performed according to the following procedure.

Wire extension clamps 20, 20 are attached to the ends of the plurality of electric wires 1, 1 to be overlaid, and the wire extension clamps are connected to each other by a connecting wire 21 as shown in FIG. Extend the wire in this state, and once the required amount of wire has been extended, loosen the tension and place the wire clamp on the ground (it may be on a part of a steel tower or on a scaffolding, etc.)
lower it to Thus, the wire clamp is removed, the end portion of the wire is stripped to expose the required length of the optical fiber, and the connection sleeve 10 is then crimped as shown in FIG. 3 by the method already described.
Optical fibers are connected and a hermetic covering 13 is applied. Thereafter, tension is applied to the wire again, and the wire is stretched to the required degree of slack, completing the overhead wire.

Since the overhead line method according to the present invention is configured as described above, there is no longer a need for a down-down connection at a steel tower as in the past, and connections can be made freely at any position, making the overhead line connection less complicated than the overhead line of a normal overhead power transmission line. This allows the optical fiber composite overhead power line to be installed without any changes.

[Effects of the Invention] As described above, according to the overhead line method according to the present invention, it is possible to connect the optical fiber composite overhead power line at any position in the same way as a normal overhead power transmission line without having to connect it down at the tower. This greatly simplifies overhead line work, and the significance of this is enormous.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram with a partial cross section showing a state connected by a connection sleeve according to the present invention, Fig. 2 is an explanatory diagram showing a state in which the electric wire is being extended, and Fig. 3 is an explanatory diagram of the connection section according to the present invention. FIG. 4 is an explanatory diagram showing the connection portion of a conventional optical fiber composite overhead wire. DESCRIPTION OF SYMBOLS 1... Optical fiber composite overhead electric wire, 2... Optical fiber, 10... Connection sleeve, 11... Wire insertion hole, 12... Optical fiber insertion hole, 13... Airtight cover, 20... Wire extension clamp.

Claims (1)

[Claims] 1. Crimp wire extension clamps to the ends of multiple optical fiber composite overhead wires to connect and extend the wires, and when the required wire extension is completed, pull down the wire extension clamps, remove the wire extension clamps, and connect the wires from the ends of each wire. A connecting sleeve is formed by stripping the optical fiber in stages and forming an optical fiber insertion hole that has electric wire insertion holes at both ends and communicates with the inner part of the insertion hole so that the optical fiber is inserted and exposed to the outside, The end of the wire is inserted into the wire insertion hole of the connection slube and crimped, and the optical fiber at the tip is inserted into the optical fiber insertion hole of the connection sleeve to be exposed to the outside of the sleeve.The optical fiber is connected and the outer periphery is covered airtight. An overhead wiring method for optical fiber composite overhead power lines, in which the wires are tied together and then stretched to the required degree of slack.