JPS6114267Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a communication cable connection portion with improved mechanical strength, waterproofness, etc.

Communication cables, especially armored cables, which are directly buried underground, are required to have mechanical strength, reliable waterproofness, etc., especially at their connection parts, so that they can withstand long-term use.

Conventionally, the connecting portion is generally configured as shown in FIG.

That is, the outer periphery of the core wire connection part 1 is covered with an MG sleeve (heat-shrinkable polyethylene sleeve) 2 having a fixed interval, and the end of this MG sleeve is covered with a PE sheath wrapped with a self-fusing tape 3. 4
It is fixed by heat shrinking on top.

A waterproof mixture 5 containing a resin and a hardening agent is injected into the MG sleeve 2 through an injection port and hardened.

A resin putty (thermosetting resin composition containing filler) 7 is applied to the outer periphery of the heat-shrinkable part 6 of the MG sleeve 2, and then a self-adhesive tape, PVC tape, gauze, etc. is wrapped around the resin putty 7 for protection. Form layer 8. After adjusting the shape of the end portion with this protective layer 8, adhesive PVC tape 9 is wound around the outermost layer to produce a connection portion.

However, at the communication cable connection part, a protective layer 8 is formed on the resin putty 7 by wrapping self-fusing tape, PVC tape, gauze, etc. as described above.
However, when winding the tape, etc., the tightening force of the tape etc. may dig into the resin putty 7, causing steps, or the resin putty 7 may droop under its own weight and form a concentric circle with the connecting cable and the MG sleeve 2. It has drawbacks such as not being able to be finished uniformly, which poses a difficulty in molding, the mechanical strength of the connection part being insufficient, and the reliability of waterproofing being inferior. There is.

This invention was made based on the above circumstances,
The purpose is to provide a communication cable connection part that can be molded with mechanical strength, waterproofness, and good appearance by covering the resin putty on the heat-shrinkable part of the MG sleeve with a blank metal braid. do.

FIG. 2 shows an embodiment of the present invention, in which the exposed part between the core wire connection part 11 and the cable outer sheath 20, the inner sheath 21
A laminate tape 23 is attached to the end of the cable jacket 20 where the corrugated sheath 22 is exposed.
fuse.

Further, after winding the self-fusing tape 13 from the inner sheath 21 to one end of the corrugated sheath 22,
The end of the MG sleeve 12 is heat-shrinked to form a heat-shrinkable part 16 on the self-bonding tape 13.

An aluminum tape 24 coated with an adhesive on one side is wound on the heat-shrinkable part 16 so that the aluminum side is the front surface.

A waterproof mixture 16 is filled into the MG sleeve 12 and hardened.

Next, resin putty 17 is applied from the heat-shrinkable part 16 of the MG sleeve 12 to the cable jacket 20,
A blank metal braid 2 is placed on the surface of this resin putty 17.
Cover with 5.

That is, when the blank braid 25 is pulled from side to side so as to be embedded in the resin putty 17 and pressed from above, the resin putty 17 forms a parabolic cone concentrically with the core wire connection portion 11 and the cable. be done.

After adjusting the shape of the resin putty 17 with the blank braid 25, an adhesive PVC tape 19 is wound around the outermost layer for finishing.

According to the above configuration, by covering the resin putty 17 with the metal hollow braid 25, the resin putty 17 is prevented from sagging due to its own weight, and it is possible to mold the resin putty into a well-defined shape. Adhesiveness with 17, and even MG sleeve 1
Aluminum tape 24 on the surface of 2 and cable jacket 2
Since the adhesiveness between the laminate tape 23 on the 0 and the resin putty 17 is good, the waterproof property can be improved and the mechanical strength can be increased. Further, since the blank braid deforms well along the curved surface of the outer periphery of the resin putty, a smooth outer surface can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view of a conventional communication cable connection section, and FIG. 2 is a partial vertical cross-sectional view of a communication cable connection section showing an embodiment of the present invention. 11... Core wire connection part, 12... MG sleeve,
16...Heat shrinkage part, 17...Resin putty, 25...
...Dry braiding.

Claims (1)

[Scope of utility model registration request] A heat-shrinkable sleeve is formed by heat-shrinking both ends of a heat-shrinkable sleeve that is placed over a core wire connection part, and a thermosetting resin containing a filler is applied to the heat-shrinkable part to perform waterproofing. A communication cable connection section characterized by reinforcing the synthetic resin by covering it with a metal blank braid.