JPS6220667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting split conductors used as conductors of cables that are subjected to mechanical forces such as bending and tension even after being connected in long cable lines such as submarine cables.

Conventionally, divided conductors have been connected all at once by sleeve compression or welding.

However, with this type of connection method, when mechanical force such as bending is applied, stress concentrates at both ends of the connection, leading to deformation of the conductor and local damage to the outer layer of insulation, making it difficult to apply to cable lines. It was impossible.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for connecting divided conductors that can maintain sufficient flexibility at the connecting portion and also allows the connecting operation to be carried out while preventing oil from leaching out from the end faces of the segments during connection.

Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the divided conductor 1 has a plurality of (six in this example) segments 2 ₁ , 2 ₂ to 2 ₆ twisted in layers, and an oil passage 3 in the center of which is an open spiral. It is formed by a tube 4. Each of the segments 2 ₁ , 2 ₂ to _{2 6} is formed by twisting a plurality of wires together.

When connecting cables, expose the required length of the divided conductor 1 of the structure described above from both cables to be connected, and connect each segment 2.
The connection partner and connection position are determined from positions ₁ to 2 and ₆ , respectively.

The connection positions are shifted in the longitudinal direction so that they are not concentrated at one location in the longitudinal direction of the divided conductor 1. At each planned connection position, each segment 2 ₁ to 2 ₆ of both divided conductors 1 is cut. In the figure, 5 ₁ , 5 ₂ to 5 ₆ (5 ₆ is not shown) indicate each cutting position. The segments 2 ₁ ′, 2 _{2 ′ to 2 6 ′ ahead of each cutting position 5 1 , 5 2 to 5 8 are} removed from the divided conductor 1 as cut segments.

In this state, both divided conductors 1 are assembled into one piece by facing the segments 2 ₁ to 2 ₆ to be connected as shown in FIG. At this time,
Both open spiral pipes 4 forming the oil passage 3 are butted against each other.

Oil flows out from between the strands on the end faces of the cut segments 2 ₁ to 2 ₆ , interfering with the connection work.
Therefore, after assembling the divided conductor 1, the ends of both segments ₂₁ to ₂₆ are removed from the divided conductor 1 one by one, and the end faces are welded or brazed to close the eyes and then returned to their original positions. Return to

Thereafter, each pair of opposing segments is connected by welding or brazing.

Note that if each of the connecting portions 6 ₁ , 6 ₂ to _{6 6} is welded to an adjacent segment, flexibility may be hindered. Therefore, in the present invention, before connecting each of the connecting portions 6 ₁ to 6 ₆ , a U-shaped separator 7 ₁ is placed around the opposing portion of each segment to be connected as shown in FIGS. 3 and 4 A and B. , 7 ₂ to 7 ₆ are preferably interposed. As for the material of the separators 7 ₁ to 7 ₆ , the same metal as each segment, an aluminum plate, a mica plate, a titanium plate with extremely good heat resistance, or tetrafluoroethylene with good heat resistance, etc. are used.

Surrounding each segment with a separator when connecting each segment in this way has the advantage of preventing the connected portion from being welded to adjacent segments, and reliably preventing flexibility from being inhibited by welding. .

Each separator may be removed at the end of the connection operation, or may be left in place.

Further, the opposing portions of each segment are beveled in advance as shown in FIGS. 4A and 4B.

Once all segments have been connected, the surface of each connected part is molded to have the same shape as the unconnected part, and the work is completed.

In particular, when the connection is made so that the connection parts 6 ₁ to 6 ₆ are above the divided conductor 1 as in this embodiment,
It is suitable because it is not affected much by oil leakage and workability such as welding during connection is very good.

Further, during the connection work, it is preferable to bind the circumference of the divided conductor 1 near the connection part with a band or the like so that the shape and outer diameter of the conductor can be maintained.

In the above embodiment, after combining both divided conductors, the end faces of each segment were closed.
Of course, the blinds may be closed before combining both divided conductors.

As explained above, in the method for connecting split conductors according to the present invention, since the connection is performed by shifting the position of each segment in the longitudinal direction, the flexibility of the split conductor in the portion including the connection part can be sufficiently reduced. can do. Further, in the present invention, since the cut end surfaces of each segment are blinded prior to the connection work, it is possible to prevent oil from flowing out from the cut end faces of each segment and interfering with the connection work.

[Brief explanation of the drawing]

Figures 1 and 2 are a cross-sectional view and side view of the divided conductor, Figure 3 is a side view of the divided conductor connection, Figure 4A is a side view of the segment with the separator attached, and Figure 4A is a side view of the divided conductor connection. Figure B is a sectional view taken along the line -A in Figure A. 1...Divided conductor, ₂₁ to ₂₆ ...Segment,
3... Oil passage, 5 ₁ to 5 ₆ ... Cutting position, 6 ₁ to
6 ₆ ... connection section, 7 ₁ to 7 ₆ ... separator.

Claims (1)

[Claims] 1. When interconnecting split conductors that are composed of multiple segments and have oil passages inside, there is a process in which each segment is cut by shifting its position in the longitudinal direction on the end side of both split conductors, and A step of combining the two divided conductors to make the two segments to be connected face each other, a step of blind welding or brazing the cut end faces of the segments, and a step of welding or brazing the facing portions of each of the segments, respectively. A method for connecting divided conductors, comprising the step of connecting by attaching.