JPH0521925Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Background and purpose of the invention] This invention is an optical fiber composite overhead ground wire (OPGW).
This relates to a wire extension clamp.

Regarding the extension clamp for optical fiber composite overhead wire, see, for example, Japanese Utility Model Application Publication No. 59-92530 and Japanese Utility Model Application Publication No. 58-75417.
No. 53-40494 and the like, and there is also a wire drawing clamp using a compression type clamp as shown in FIG.

The figure shows an example of an OPGW terminal using a compression type clamp, in which the optical fiber 1 is sheathed with an aluminum pipe 2, and the power stranded wire 3 is outside.
is wrapped. 4 and 5 are optical fiber 1
and the waterproofing part of the end of aluminum pipe 2, 4
5 is a heat-shrinkable cap, and 5 is a self-adhesive tape wound on top of the cap. Reference numeral 6 denotes an end portion of a crimp-type wire extension clamp, which crimp the end portion of the power twisted wire 3 with the metal rod 7 as the core.

The terminal processing in the figure is performed by first dismantling the power stranded wire 3, cutting the optical fiber 1 and aluminum pipe 2, and waterproofing the cut surface with a cap 4 and tape 5. Twist the fibers 3 again and put them back together, and tighten the wire clamp 6 using the metal rod 7 to avoid applying direct impact to the optical fiber 1.
This is done by crimping the ends of the power twisted wires 3, but the following problem occurs at this time.

(1) When dismantling the power twisted wires 3, the optical fiber 1 is likely to be damaged.

(2) It is very difficult to re-twist the power conductor 3. This becomes more difficult when there are two or more twisted layers, and even more difficult when the strands are not round but fan-shaped.

As described above, the conventional terminal processing using wire clamps has the drawback of extremely poor workability.

An object of the present invention is to provide a wire extension clamp for an optical fiber composite overhead wire terminal that improves work efficiency.

[Summary of the invention] The invention is a combination of a power cable and an optical fiber cable housed in a pipe, a clamp for extending the wire at the end thereof, and a waterproofing device for waterproofing the optical fiber cable and the end of the pipe. A wire extension clamp for an optical fiber composite overhead wire terminal having a processing section includes a hollow wire extension clamp that accommodates the end portion of the optical fiber composite overhead wire, and a wire extension clamp that is divided into a plurality of parts and extends along the outer periphery of the power cable terminal. , a wedge inserted into the gap between the hollow wire clamp and the power cable terminal, one end of which is inserted toward the head of the wedge in the hollow wire clamp, and houses the waterproofing section. The present invention is characterized in that it has a metal fitting having a space for holding the wire, and a screw portion for fixing the metal fitting and the hollow wire clamp, and the hollow wire clamp can be attached and detached, thereby greatly improving work efficiency. The goal was to be achieved in this way.

[Embodiment of the invention] Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of one embodiment of the wire extension clamp of the optical fiber composite overhead wire terminal of the present invention, and the same parts as in FIG. 3 are denoted by the same reference numerals.

The figure shows the terminal part of the OPGW, and 8 is a hollow wire clamp, in which the terminal of the OPGW 13 is housed. 9 is a wedge, power stranded wire 3
It is inserted into the gap between the wire extension clamp 8 and the power twisted wire 3 along the outer periphery of the wire clamp 8, and fixes both. Reference numeral 10 denotes a metal fitting whose one end is housed and fixed to the end of the wire extension clamp 8 on the side into which the wedge 9 is inserted, and is used as a hook. Reference numeral 11 denotes a space provided in the connecting fitting 10, in which the waterproofing parts 4 and 5 are housed. Reference numeral 12 denotes a bolt for fixing the wire extension clamp 8 and the metal fitting 10.

In the wire extension clamp of this embodiment, when attaching the tip of the OPGW 13 to the wire extension clamp 8, the OPGW 13 is attached to the wire extension clamp 8.
The aluminum pipe 2 is taken out by peeling off the tip of the tube 13, and the tip is waterproofed using a heat-shrinkable cap 4, a self-adhesive tape 5, or the like. Next, the wedge 9 is first inserted into the wire extension clamp 8. The wedge 9 of the present invention is divided into two or more parts, as shown in the side view of FIG. 2a and the top view of FIG. 2b. There is a step on the inner surface of the wire clamp 8 at the boundary between the truncated cone and the cylindrical section, but when the wedge 9 is inserted with the divided pieces of the wedge 9 in close contact with each other and their inner diameters minimized, the wedge 9 will not force the step. pass without. In this way, the head of the wedge 9 comes close to the side surface of the stepped portion on the truncated conical side. That is, the wedge 9 is inserted until it is fully positioned on the large diameter side of the truncated cone. When the wedge 9 is in this position, a slight gap will exist between the wedge 9 and the OPGW 13 that will be inserted subsequently. Next, on the inside of wedge 9, we installed OPGW1 with the tip waterproofed as described above.
Insert 3. Because the above gap exists,
Position the tip of OPGW13 as shown in Figure 1.
In other words, it can be inserted up to the cylindrical portion side of the inner surface of the wire extension clamp 8. When removing the OPGW13, please use the wedge 9 after insertion.
Make sure that the power twisted wire 3 of the OPGW 13 is located inside the OPGW 13. As above,
After inserting the tip of the OPGW 13 into the wire drawing clamp 8, abut the head of the wedge 9 with a metal fitting or metal fitting 10, and hit it with a hammer or the like from the outside of the wire drawing clamp 8, and the wedge 9 will be inserted into the wire drawing clamp. 8 and around the power twisted wire 3, and the terminal of the OPGW 13 is fixed to the wire extension clamp 8.

After the wedge 9 is inserted, the metal fitting 10 is inserted. The metal fitting 10 is fixed to the wire drawing clamp 8 by a bolt 12.

That is, in this embodiment, the tip of the OPGW 13 is fixed inside the wire drawing clamp 8 by the action of the wire drawing clamp 8 and the wedge 9, so that there is no possibility of instability due to play during wire drawing. . Furthermore, since the space section 11 is provided, the waterproofing section 4
Even if parts 5 and 5 become thick due to the waterproof material, they can be accommodated without affecting other parts.

In this embodiment, the above-mentioned step portion is present on the inner surface of the wire extension clamp 8, but the intended purpose of fixing can be sufficiently achieved even without forming such a step portion. In short, it is sufficient that the inner surface of the wire extension clamp 8 on the wedge insertion side has a shape compatible with the hook 10 described later.

As described above, in this embodiment, the following effects can be obtained compared to the case of conventional terminal processing.

(1) Since there is no need to disassemble and retwist the power twisted wires, the work time for terminal processing can be significantly shortened. Furthermore, there is no risk of damaging the optical fiber composite overhead line.

(2) Since there is no need to compress the wire clamp as shown in Figure 3, a hydraulic pump and compression die are no longer necessary.

(3) By storing the waterproof part in the space of the metal fitting, it can be reliably protected. Therefore, the waterproofing means can be simplified.

(4) In the case of a compression clamp, it is impossible to reuse it, but since the clamp of this embodiment has a bolted structure, it can be used repeatedly by removing the bolt.

[Effects of the invention] According to the invention, it is possible to provide a wire extension clamp for an optical fiber composite overhead line terminal, which greatly improves work efficiency.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the wire extension clamp of the optical fiber composite overhead line terminal of the present invention, and Fig.
The main part side view and top view of the figure, and FIG. 3 are explanatory diagrams of a conventional compression type wire extension clamp. 1... Optical fiber, 2... Pipe, 3... Power twisted wire, 4, 5... Waterproofing section, 8... Wire extension clamp, 9... Wedge, 10... Metal fitting, 11... Space section, 12...Bolt.

Claims (1)

[Scope of utility model registration request] An optical fiber composite overhead line in which a power cable and an optical fiber cable housed in a pipe are combined, and the terminal part thereof has a clamp for extension, and a waterproofing part for waterproofing the optical fiber cable and the end of the pipe. The terminal wire extension clamp includes a hollow wire extension clamp that accommodates the end portion of the optical fiber composite overhead wire, and a plurality of hollow wire extension clamps that are divided into a plurality of parts and extend along the outer periphery of the power cable terminal. a wedge inserted into a gap with a cable terminal; a metal fitting having one end inserted toward the head of the wedge in the hollow wire extension clamp and having a space for accommodating the waterproofing section; A wire extension clamp for an optical fiber composite overhead wire terminal, comprising a screw fixing portion for fixing the hollow wire extension clamp to the hollow wire extension clamp, and allowing the hollow wire extension clamp to be attached and detached.