JPH0318215A - Method of assembling pre-fabricated connection of rubber-plastic insulating power cable - Google Patents

Abstract

PURPOSE:To enable effectively using an enlarging pipe by fixing a pre-mold connection insulator to the outer face of a conductor connection when said pre-mold connection insulator is fit to the outer face of a cable core before said conductor connection is formed and using said enlarging pipe as a cable protection tube. CONSTITUTION:Before a conductor connection 9 is formed, a pre-mold connection insulator 7 fixed to the outer face of an enlarging pipe 13 is fit to the outer face of a cable core 5A on the joint relief dimension section of said pre- mold connection insulator 7 for relief. After the conductor connection 9 is formed, the enlarging pipe 13 is pulled out from the pre-mold connection insulator 7 on to the cable core 5A, the pre-mold connection insulator 7 is fixed to the outer face of the conductor connection 9, and the enlarging pipe 13 is used as a cable protection tube 11. Thereby the enlarging pipe 13 can be used effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of assembling a rubber-plastic insulated power cable prefabricated connection.

[Prior Art] FIG. 2 shows a prefabricated connection part 2 of a conventional rubber/plastic insulated power cable LA, IB. Both rubber and plastic insulated power cables to be connected I
A and IB are cable cores 5A consisting of cable conductors 3A and 3B and cable insulators 4A and 4B that cover the outer periphery thereof.
, 5B, cable sheaths 6A, 6B are provided around the outer periphery of the cables. Of both rubber/plastic insulated power cables LA and IB, the cable sheath 6A of one power cable IA has been removed by at least the fit relief dimension L1 of the pre-molded connection part insulator 7, and the other power cable IB has the connection part insulator 7 removed. The cable sheath 6B is removed by the required length L2, and the cable cores 5A and 5B are exposed.

At the exposed ends of the cable cores 5A, 5B, the mutual cable conductors 3A. 3B are connected with a compression sleeve 8 to form a conductor connection portion 9. On the outer periphery of the conductor connection part 9, the above-mentioned pre-molded connection part insulator 7 made of rubber is attached in a tight fit state, spanning the cable cores 5A, 5B on both sides thereof. On the outer periphery of the pre-molded connection insulator 7, there is a connection protection case 10A of a transversal two-part type.
, 10B are installed. Both connection parts protective case 10A
, IOB are flange-connected to each other at a case connection portion 10C. A cable protection tube l1 made of a straight tube is attached to the outer periphery of the cable core 5A at the fitting relief dimension L1 portion of the pre-molded connection portion insulator 7. The connection part protective case IOA and the cable protection tube 11 are the sealing part 12
A, the connection protection case IOB and cable sheath 6B are sealed in the sealing part ↓ 2B, and the cable protection tube 11 and cable sheath 6A are sealed in the sealing part 1.
Sealed with 2C.

When forming such a prefabricated connection part 2, as shown in FIG. Cable protection tube 1 is installed on the outer periphery in advance.
A cylindrical pre-molded connection insulator 7 is fitted onto the outer periphery of the cable core 5A and a connection part protection case 10A is fitted therein. In this case, the pre-molded connecting portion insulator 7 is attached to the outer periphery of the diameter expanding pipe 13, fitted onto the outer periphery of the cable core 5A, and moved to a predetermined position as shown. A connecting portion protection case IOB is fitted onto the outer periphery of the cable sheath 6B of the other power cable 1B and left open.

After forming the conductor connection part 9 in such a state, the pre-molded connection part insulator 7 is returned to the outer periphery of the conductor connection part 9 together with the diameter expansion pipe 13 as shown in FIG.
is extracted from the pre-molded connection insulator 7, and the pre-molded connection insulator 7 is attached to the outer periphery of the conductor connection part 9 in a tight fit state. The diameter expansion pipe 13 that is no longer needed is
Destroy and remove. The connection portion protection cases IOA and IOB are returned and attached to the outer periphery of the pre-molded connection portion insulator 7. Furthermore, the cable protection tube 11 is returned and attached to the outer periphery of the cable core 5A, as shown in FIG. After that, sealing processing parts 12A to 12C as shown in FIG. 2 are formed.

[Problems to be Solved by the Invention] However, in such a conventional method of assembling the prefabricated connection 4 part 2, the pre-molded connection part insulator 7 is used to enlarge the diameter and attach it to the outer periphery of the cable core 5A. It is necessary to break and remove the diameter expanding pipe 13 after it has been used, which poses the problem of being uneconomical.

SUMMARY OF THE INVENTION An object of the present invention is to provide a prefabricated connection for a rubber/plastic insulated power cable that can be used without destroying the diameter expansion pipe.

[Means for Solving the Problems] To explain the configuration of the present invention to achieve the above object, the present invention provides that, of both rubber/plastic insulated power cables to be connected, one of the power cables has at least a pre-insulated power cable. The cable sheath is removed by the fit relief dimension of the molded connection part insulator, and the cable sheath of the other power cable is removed by the length required to form the connection part to expose each cable core, and both of the exposed cable cores are removed. A conductor connection part is formed by connecting the cable conductors to each other at the tips of the conductor connection part, and the pre-molded connection part insulator is attached to the outer periphery of the conductor connection part so as to straddle the cable core on both sides thereof in an interference fit state, A connection protection case is attached to the outer periphery of the pre-molded connection insulator, and a cable protection tube has one end attached to the outer periphery of the cable core in the fit relief dimension portion of the pre-molded connection insulator. In a method of assembling a prefabricated rubber/plastic insulated power cable connection part connected to and attached to a protective case, before forming the conductor connection part, the cable core of the fitting relief dimension part of the premold connection part insulator is When the pre-molded connection insulator is fitted to the outer periphery of the cable core and left on standby, the pre-molded connection insulator is fitted to the outer periphery of the diameter expanding pipe and left on standby on the outer periphery of the cable core. , the diameter expanding pipe is used as the cable protection pipe after the pre-molded connection insulator is tightly fitted onto the outer periphery of the conductor connection part.

[Function] When the diameter expansion pipe is used as a cable protection tube in this way, there is no need to break and remove it after the original diameter expansion purpose is completed, and the diameter expansion pipe can be used effectively. This eliminates the need for removing pipes.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIG. Note that parts corresponding to those in FIGS. 2 and 3 described above are designated by the same reference numerals.

As shown in FIG. 1, in the method of assembling the prefabricated connection part 2 of the rubber/plastic insulated power cables LA and IB of this embodiment, the premold connection part insulator 7 is connected to the diameter expanding pipe ↓3.
As shown by the broken line on the outer periphery of the pre-molded connection portion insulator 7, the cable core 5A is fitted onto the outer periphery of the cable core 5A at the fit relief dimension portion of the pre-molded connection portion insulator 7 before the conductor connection portion 9 is formed. The diameter expanding pipe 13 used in this embodiment has an inner diameter slightly larger than the outer diameter of the cable core 5A, and an expanded diameter portion 13A is provided at one end in the long direction so as to be able to cover the outer periphery of the cable sheath 6A. It has a well-defined structure.

After forming the conductor connection part 9, the pre-mold connection 7 part insulator 7 is returned together with the diameter expansion pipe king 3, and at that position, the expansion pipe 13 is moved from the pre-mold connection part insulator 7 to the cable core 5A side. The pre-molded connecting portion insulator 7 is removed and fitted onto the outer periphery of the conductor connecting portion 9 in a tight fit state. Diameter expansion pipe pulled out to cable core 5A side■3
is used as a cable protection tube 11 that covers the outer periphery of the cable core 5A in the fit-out dimension portion of the pre-molded connection portion insulator 7.

Thereafter, the prefabricated connecting portion 2 as shown in FIG. 2 is completed through the steps described above.

As the diameter expanding pipe 13, a pipe made of copper, aluminum, stainless steel, etc. is used because it is also used as the cable protection pipe 11.

Note that this enlarged diameter pipe 13 is similar to the cable protection tube 11.
It is preferable to impart flexibility by corrugating the material at the stage of use. In this way, the prefabricated connection part 2
can be bent at the cable protection tube 11 to provide an offset, and the manhole accommodating the prefabricated connection part 2 can be made smaller.

[Effects of the Invention] As explained above, in the method for assembling a rubber/plastic insulated power cable prefabricated connection part according to the present invention, the diameter expansion pipe is used as a cable protection pipe, so that the original pre-molded connection part insulator is used. There is no need to break and remove the diameter-expanding pipe after the end of the diameter-expanding use, and the advantage is that the diameter-expanding pipe can be used effectively, and the step of removing the diameter-expanding pipe is no longer necessary.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of the assembly process of the prefabricated connection part according to the present invention, Fig. 2 is a longitudinal sectional view of a conventional pre/SP connection part, and Fig. 3 is an assembly of a conventional prefabricated connection part. It is a longitudinal cross-sectional view showing a process. IA, IB...Rubber/plastic insulated power cable, 2...Prefabricated connection part, 3A, 3B...Cable conductor, 4A, 4B...Cable insulator, 5A, 5B...
・・Cable core, 6A, 6B・・Cable sheath,
7... Pre-molded connection part insulator, 8... Compression sleeve, 9... Conductor connection part, IOA. IOB...connection part protective case, 10C...case connection part, 11...
Cable protection tube, 12A to 12C...Sealing processing section, 1
3... Pipe for diameter expansion.

Claims (1)

[Claims] Of the two rubber-plastic insulated power cables to be connected, one of the power cables has its cable sheath removed by at least the fit relief dimension of the pre-molded connection insulator, and the other power cable has the cable sheath removed by at least the length required to form the connection. The cable sheath is removed to expose each cable core, and the cable conductors are connected to each other at the tips of the exposed cable cores to form a conductor connection, and the outer periphery of the conductor connection is The pre-molded connection insulator is fitted over the cable core with a tight fit, a connection protection case is attached to the outer periphery of the pre-molded connection insulator, and the pre-molded connection insulator is fitted over the cable core. In the method for assembling a prefabricated rubber/plastic insulated power cable connection part, a cable protection tube is attached to the outer periphery of the cable core in the joint/release dimension part with one end connected to the connection part protection case,
When the pre-molded connection insulator is fitted to the outer periphery of the cable core in the fit relief dimension portion of the pre-molded connection insulator and left on standby before the formation of the conductor connection part, the pre-mold connection The section insulator is fitted to the outer periphery of the diameter expanding pipe and is kept waiting on the outer periphery of the cable core, and after the pre-molded connection section insulator is fitted tightly onto the outer periphery of the conductor connection section, the A method for assembling a prefabricated connection part of a rubber/plastic insulated power cable, characterized in that the diameter expanding pipe is used as the cable protection tube.