JPS6223214Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a communication cable with a gas dam.

Gas dams for communication cables are installed at regular intervals, and gas maintenance is performed within the cable sections between the gas dams. However, these cable sections may be required to be in gas communication with each other for various reasons. For this reason, one of the prior art techniques involves partially stripping off the jackets of the cable sections on both sides of the gas dam, and connecting a bypass pipe with a valve into the cable sections on both sides through these stripped sections. In another conventional technique, both ends of a bypass pipe having a valve pass through a gas dam and communicate with cable sections on both sides (see Utility Model Application No. 54-42554). However, in either case, the bypass pipe protrudes significantly from the outer circumference of the gas dam, so it becomes an obstacle when installing the cable, causing damage to the bypass pipe and valve, making it difficult to actually run the cable through existing pipelines. In addition, in the former conventional technique, after forming the gas dam, the outer sheaths of the cable parts on both sides of the gas dam are peeled off and the bypass pipe is connected, which increases the number of steps. The work of inserting the cables into the cables on both sides of the gas dam was troublesome, and both had the disadvantage of poor workability.

The purpose of the present invention is to provide a communication cable with a gas dam that facilitates the cable installation work, allows gas communication between the cable parts on both sides of the gas dam as needed, and can be manufactured with good workability. It is in.

Embodiments of the present invention will be described in detail with reference to the drawings. The drawings show a communication cable 10 with a gas dam according to the present invention, and this communication cable 10 is arranged between the core wires in the part where the jacket is peeled off. It has a gas dam 12 filled with a dam filler.

There are two communication pipes 14, 14' inside the gas dam 12.
are passed through, and one end of these communication pipes 14, 14' is connected to the cable portions 11, 14 on both sides of the gas dam 12.
11' from the cut side of the jacket and opens into the cable portions 11, 11', and the other end is bent in the radial direction and extends to near the outer periphery of the gas dam 12. Further, two valves 16 and 16' are connected to the other ends of the two communication pipes, respectively, and these valves 16 and 16' are buried in the gas dam 12 so that their heads are exposed on the outer peripheral surface of the gas dam 12. has been done. Therefore, in the normal state when the valves 16, 16' are closed, the cable portions 11, 1 on both sides
1', the gas passage is blocked, and by opening the valve 16 or 16', the gas pressure within the cable portions 11, 11' can be detected.

On the other hand, when it is desired to connect the cable portions 11 and 11' on both sides, a bypass pipe 22 having a bypass valve 18 in the middle and connectors 20 and 20' at both ends is used as shown in the figure. ′
are connected to valves 16, 16'. When the bypass valve 18 is opened in this state, the cable portion 11,
Gas within 11' is communicated through bypass pipe 22.

According to the present invention, as mentioned above, only the two valves that communicate with the cable sections on both sides of the gas dam are exposed on the outer peripheral surface of the gas dam. Communication cables can be easily routed through the conduit, and gas dams are constructed by inserting two independent communication pipes into each cable section and then molding them into a mold, instead of using one long bypass pipe as in the conventional technology. Compared to the case where the cable is inserted into the cable part and then molded, the workability is significantly improved, and a communication cable with a gas dam can be obtained economically. It can be easily communicated using a bypass pipe with a

[Brief explanation of the drawing]

The drawing is a side view of a communication cable with a gas dam according to the present invention and a bypass pipe used for communication therebetween. 10...Communication cable with gas dam, 11,1
1'...Cable part, 12...Gas dam, 1
4, 14'...Communication pipe, 16, 16'...Valve.

Claims (1)

[Scope of utility model registration request] In a communication cable having a gas dam formed by filling a dam filler between the core wires in a part of the communication cable where the outer sheath has been peeled off, the cable passes through the gas dam and has one end inserted into the cable portions on both sides of the gas dam. two communicating pipes that are open and whose other ends extend to near the outer periphery of the gas dam; and two valves that are connected to the other ends of the two communicating pipes and are buried within the gas dam so as to be exposed on the outer peripheral surface of the gas dam. Communication cable with gas dam.