JPS6250803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for exchanging old and new optical cables of an optical composite overhead cable in which an optical cable for optical communication is incorporated into an overhead cable.

In a recently developed optical composite overhead cable that incorporates an FRP-coated optical cable for optical communication into an overhead cable, the optical cable is installed inside the optical cable after installation.
If the FRP coated optical cable is damaged for some reason, such as a broken wire, it will be necessary to replace it with a new optical cable. Conventionally, as shown in FIG. 1, a predetermined length of the internal FRP-coated optical cable 21 is exposed from the terminal part of the optical composite overhead wire 20, and the terminal of the new FRP-coated optical cable 22 to be replaced is inserted into the terminal of the FRP-coated optical cable 21. At the same time, the thin-walled pipe 23, which has been inserted into the new FRP-coated optical cable 22 in advance, is drawn to the butt part of the old and new FRP-coated optical cables 21, 22, and the FRP coatings of both optical cables 21, 22 and the thin-walled pipe 23 are bonded with adhesive or the like. After connecting the FRP coated optical cables 21 and 22 to each other, as shown in Fig. 1, pull out the old FRP coated optical cable 21 from the terminal of the optical composite overhead wire 20 in the direction of the arrow and connect the old and new FRP coated optical cables.
The FRP-coated optical cables 21 and 22 were replaced, but according to this method, the new and old FRP-coated optical cables 21 and 22, which were connected by covering the thin-walled pipe 23,
Not only does the outer diameter of the butt joint 22 become larger than the outer diameter of the FRP coated optical cables 21 and 22, but also the bending rigidity becomes larger, so that the optical composite overhead wire 20
It is difficult to pass the connection part on the curved part of the construction.
There are disadvantages such as the long time it takes to replace FRP coated optical cables.

The method of the present invention has been devised in view of the above points, and an example illustrating the method will be described below.
In Fig. 2, 1 is an FRP coated optical cable 2 inserted into an aluminum pipe 3 for protection.
This is an optical composite overhead wire (e.g. overhead ground wire) formed by twisting and laminating aluminum or steel wires 4 on top, and the FRP coated optical cable 2 incorporated inside the optical composite overhead wire 1 may be damaged for some reason after being installed. If the wire is broken or broken due to a wire breakage, as shown in FIG.
Cut the FRP coated optical cable 2 to a predetermined length to expose the internal FRP coated optical cable 2, and then cut both the FRP coated optical cable 2 and the new FRP coated optical cable 5 to be replaced.
The outer circumferential surfaces of the terminal parts of the FRP sheathings 2b and 5b are each made narrow in diameter by a predetermined length, and the FRP sheathings 2b and 5b are cut to a predetermined length to cut off the inner optical cables 2a and 5a to a required length. The ends of the optical cables 2a, 5a are butted together, and the FRP coated shaft holes 2c, 5c where the optical cables 2a, 5a have been removed are filled with FRP having the flexibility of the length and thickness of the optical cables 2a, 5a that were cut out as shown in FIG. A rod or piano wire 6 is inserted and adhered to the FRP coatings 2b, 5b with an adhesive, etc., and then a glass cloth tape 7 with a thin diameter is attached to the outer periphery of the connecting portions of the FRP coatings 2b, 5b. After connecting the old and new FRP coated optical cables 2 and 5 by wrapping and fixing them with adhesive etc. and making the outside diameter of the connection part almost the same as the other, as shown in Fig. 5, from the terminal of the optical composite overhead wire 1 to the old FRP Pull out the coated optical cable 2 in the direction of the arrow and replace the old and new FRP coated optical cables 2 and 5. In addition, as an optical cable, multiple optical core wires are assembled to form an optical unit.
This may be coated with FRP, and the aluminum tube 3 may be omitted depending on the case.

The method of the present invention is as described above, from the terminal of the optical composite overhead wire 1 to the internal FRP coated optical cable 2
A predetermined length of the FRP coated optical cable 2 is exposed.
The outer circumferential surfaces of both FRP sheaths 2b and 5b of a new FRP coated optical cable 5 to be replaced with this are made thinner by a predetermined length, and the optical cables 2a and 5a are cut by cutting the FRP sheaths 2b and 5b to a predetermined length. A flexible FRP rod or piano wire 6 is inserted and glued into the remaining FRP-coated shaft holes 2c and 5c, and a glass tape 7 is wrapped around the outer circumference of the FRP-coated connection portion, which has a small diameter. Since the new and old FRP coated optical cables 2 and 5 are connected, the outer diameter and bending rigidity of the connection part of the new and old FRP coated optical cables 2 and 5 are the same as those of FRP.
The outer diameter and bending rigidity of the coated optical cables 2 and 5 are almost the same, and the
When pulling out the FRP coated optical cable 2 and replacing the new and old FRP coated optical cables 2 and 5, even if there is a curved installation part, the connection part passes smoothly without any problems, making the replacement work of the new and old FRP coated optical cables easy and quick. It has excellent advantages such as significantly improved workability. The above is aluminum pipe 3
We illustrated and explained how to replace the old and new optical cables of the optical composite overhead cable 1 in which the FRP coated optical cable 2 is inserted and protected, and aluminum or steel wires 4 are twisted and laminated on the aluminum pipe 3. It goes without saying that the present invention can also be applied to the replacement of old and new optical cables in optical composite overhead cables, which are constructed by inserting and protecting an FRP coated optical cable into a so-called smooth body cable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional optical cable replacement method, FIG. 2 is an explanatory diagram showing an optical composite overhead wire, and FIGS. 3 to 5 are explanatory diagrams showing the steps of the method of the present invention. 1: Optical composite overhead wire, 2: FRP coated optical cable, 2a: Optical cable, 2b: FRP coated, 2
c: FRP coated shaft center hole, 5: FRP coated optical cable, 5a: Optical cable, 5b: FRP coated, 5
c: FRP coated shaft center hole, 6: FRP rod or piano wire, 7: glass tape.

Claims (1)

[Claims] 1. Exposing a predetermined length of the internal FRP-coated optical cable from the terminal part of the optical composite overhead electric wire, and reducing the diameter of both the FRP-coated outer peripheral surfaces of the FRP-coated optical cable and the FRP-coated optical cable to be replaced by a predetermined length, respectively. Cut the FRP sheathing to a predetermined size, cut out the optical cable to the required length, and insert and glue a flexible FRP rod or piano wire into the cut-out FRP sheath center hole to create a small-diameter connection. FRP
New and old FRP by wrapping glass tape around the outside of the coating
After connecting the coated optical cable, pull out the old FRP coated optical cable from the optical composite overhead wire terminal and connect the old and new FRP coated optical cables.
A method for exchanging old and new optical cables in an optical composite overhead wire, which is characterized by exchanging FRP-coated optical cables.