JPS5858887B2 - How to connect a conduit aerial power transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting an aerial power transmission line.

Figure 1 shows a typical method for connecting aerial power transmission lines using sheath welding.

1 is a conductor, 2 is a sheath, 3 is an auxiliary sheath for a connection part, 4 is a welding part, and 5 is an 01J ring.

The disadvantage of this method is that it requires high precision in laying.

If the installation accuracy is poor or the diameter of the insertion part of the auxiliary sheath 3 is large, the dustproof effect of the OIJ song will be completely lost.

In order to eliminate the drawbacks shown in FIG. 1, FIG. 2 uses a plurality of disc-shaped dustproof rubber 6, so-called labyrinth packings, instead of an O-ring for dustproofing.

That is, the plural pieces of dustproof rubber 6 are tightened with bolts (thereby, the rubber receiver fixed to the sheath 2 is fixed to the metal fitting O).

This method (due to poor installation accuracy, even if the insertion play of the auxiliary lease 3 is increased, the diameter of the dust-proof rubber 6 can be adjusted to the auxiliary sheath 3).
If you make it slightly larger, you can expect a dustproof effect.

However, by performing welding 4, the temperature of the air in the small space 8 rises, air flows from the small space 8 into the insulating space 9, and welding debris etc. are mixed into the insulating space 9.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a connection method that does not reduce the performance of an aerial power transmission line.

The configuration of the present invention will be specifically explained with reference to FIG. 3 showing one embodiment.

In FIG. 3, 1 is a conductor, 2 is a sheath, and 3 is an auxiliary sheath for a connection portion.

Here, as in the case of FIG. 2, the welding 4 is performed while the dust-proof rubber 6 is provided, and at this time the welding 4 is performed while drawing the gas in the small space 8 to the outside.

7 is a connector. By drawing the gas in the small space 8 to the outside in this manner, even if the gas expands due to the heat of the welding 4, the dust-proof rubber is pushed away and the gas and welding waste do not enter the insulating space 9.

Therefore, according to the connection method of the present invention, the performance of the pipeline aerial power transmission line is not reduced.

However, if the gas in the small space 8 is unilaterally pulled out to reduce the pressure, it will conversely invite debris from the welding area into the small space 8.
Appropriate adjustment is required.

Depending on the situation, you can also do the opposite (this can be done by wiping nitrogen gas etc. from the connector).

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing a conventional method of connecting an aerial power transmission line, and FIG. 3 is an explanatory diagram showing an embodiment of the present invention. 1: Conductor, 2: Sheath, 3: Auxiliary sheath, 4: Welded part,
5: 0 ring, 6: dustproof rubber, 1: connector, 8: small space, 9: insulation space.

Claims (1)

[Claims] 1. In a method for connecting a conduit aerial power transmission line having a conductor 1 and a sheath 2, when welding the sheath 2 and the auxiliary sheath 3 of the connection part, first, a dustproof rubber 6 is provided inside the welded part,
A method for connecting an aerial power transmission line to a conduit, which is characterized in that the gas in the space 8 formed by the sheath 2, the auxiliary sheath 3, and the dust-proof rubber 6 is then drawn during the welding operation.