JP2762840B2 - How to reinforce the power cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a power cable connection, particularly a power cable connection directly underground.

[0002]

2. Description of the Related Art FIG. 2 is a longitudinal sectional view showing an example of a conventional structure for reinforcing a power cable connecting portion. In the drawings, reference numeral 1 denotes a power cable, and reference numeral 2 denotes a connection metal tube provided with a cable core of the power cable 1 therein. The metal tube 2 has a structure split into two on the left and right sides, is inserted from the left and right onto the cable core connection part, and is joined and integrated at the flange part 3. The ends of the metal tubes 2 are respectively positioned on the metal sheath of the power cable 1 and are airtightly connected to the metal sheath by the leader 4.
A cable connection is formed.

However, in the case of a direct buried power cable,
In order to mechanically and electrically protect the above-described cable connection, a protective cover is provided on the outside thereof. Reference numeral 10 denotes the above protective cover, which covers the entire cable connection portion, and both ends thereof are airtightly connected to the metal sheath of the cable 1 by a leader 7 and filled into the protective cover 10 from the filler inlet 10a like an insulating compound. Filling agent 8 protects the internal cable connection mechanically and electrically.

[0004]

In the conventional method of reinforcing a cable connecting portion, a protective cover is provided on the outside of the cable connecting portion so as to cover the entire connecting portion. The amount of the filler to be filled therein is also large. Further, there is a problem that a large construction space is required on site and the transportation cost and the product cost are high.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been made to reduce the size and weight of a protective cover and to reinforce a power cable connection portion capable of greatly reducing the amount of filler. The present invention provides a method, which is characterized by a lead portion provided between a metal sheath for connection provided inside a connection portion of a cable core and a metal sheath of a cable, and a flange joint portion between the connection metal tubes. An anticorrosion layer is provided on each of them, a protective cover is provided outside each of the anticorrosion layer portions, and the inside is filled with a filler.

[0006]

FIG. 1 is a longitudinal sectional view of a power cable connecting portion reinforcing structure formed by the reinforcing method of the present invention. The formation of the connection portion of the power cable 1 on site is no different from the conventional formation shown in FIG. Then, the anticorrosion tape, the heat shrink tape or the like is applied on the lead joint 4 provided between the connecting metal tube 2 of the connecting portion and the metal sheath of the cable 1 and the flange joint portion 3 between the connecting metal tubes 2. Layer 5 is applied. Thus, on the anticorrosion layer 5 applied locally,
Each of the protective covers 6 is covered, and the ends thereof are subjected to a lead work 7 to maintain airtightness. The protective cover 6 is filled with a filler 8 such as an insulating compound from an inlet 6a to reinforce the protective cover.

[0007]

As described above, according to the method for reinforcing a power cable connecting portion of the present invention, the following effects can be obtained. (1) Since the protective cover does not cover the entire power cable connection portion as in the conventional case, but covers the lead portion and the flange joint portion, the protective cover can be reduced in size and weight, and therefore can be filled in the protective cover. The amount of filler used can be greatly reduced, which is economical. (2) Since the protective cover is reduced in size and weight as described above, the transportation cost can be reduced. (3) The on-site assembling work can be carried out at a staggered time, or the assembling can be carried out by division of labor. (4) In the conventional method, if oil leaks from either the lead section or the flange joint, remove the protective cover that covers the whole, remove the filler, repair it, attach the protective cover again after repair, and fill Because of the necessity of filling with the agent, repair and reassembly required a great deal of labor and time. On the other hand, according to the reinforcing method of the present invention, when the above-mentioned oil leakage occurs, the protective cover only needs to be removed and reassembled, so that the labor and time required for this are greatly reduced. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a reinforcing structure of a power cable connecting portion formed by a reinforcing method of the present invention.

FIG. 2 is a longitudinal sectional view of an example of a conventional reinforcing structure of a power cable connecting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power cable 2 Metal tube for connection 3 Flange joint 4 Lead work 5 Corrosion protection layer 6 Protective cover 7 Lead work 8 Filler

Claims (1)

(57) [Claims] An anticorrosion layer is provided on a lead portion provided between a connecting metal tube provided with a connecting portion of a cable core and a metal sheath of a cable and a flange joint between the connecting metal tubes. A method of reinforcing a power cable connecting portion, comprising: providing a protective cover outside each of the anticorrosion layer portions; and filling a filler inside the protective cover.