JP3763983B2 - How to connect a steel core aluminum stranded wire to a retaining clamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of connecting a steel core aluminum stranded wire to a clamping clamp .
[0002]
[Prior art]
For example, the overhead power transmission line is formed by twisting an aluminum wire as a conductive portion around a steel stranded wire as a tension member, and this stranded wire is called a steel core aluminum stranded wire.
In order to connect the steel core aluminum stranded wires, a connection structure using a compression connecting pipe is used. In this connection structure, the ends of the steel core aluminum stranded wires are stepped off to expose the steel stranded wires, and the exposed steel stranded wires are inserted into a steel sleeve that becomes a compression connecting pipe, and compressed and fixed from the outside of the steel sleeve. It is what. Then, the aluminum sleeve which becomes another compression connection pipe is covered from the steel sleeve to the aluminum stranded wire, and the entire aluminum sleeve is compressed and fixed from the outside.
In such a compression connection, moisture such as rainwater enters into the gap formed in the aluminum sleeve, and this moisture freezes and the aluminum sleeve is ruptured. There is a risk of corroding the wire. Therefore, in order to prevent moisture from entering the aluminum sleeve, zinc chromate or anticorrosive grease is filled in the aluminum sleeve as a filler.
Note that the compression connection pipe is not limited to a sleeve shape, and may be a clamp or the like.
[0003]
[Problems to be solved by the invention]
However, the compression connection described above has the following problems. That is,
1) When zinc chromate is used as a filler, the oil component volatilizes during use and becomes a powder. This powder absorbs moisture such as rain water and swells, and freezes in winter to rupture the aluminum sleeve. There was a thing.
2) When anti-corrosion grease is used as a filler, the grease is emulsified by water and flows out, so that it cannot withstand long-term use.
[0004]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems . A steel core aluminum stranded wire having an aluminum stranded wire layer on the outer periphery of a steel stranded wire is inserted at a depth (l) at which the steel stranded wire is inserted. A steel core aluminum strand comprising: a steel clamp having a hole; and an aluminum clamp in which the hole into which the steel clamp and the steel core aluminum strand are inserted is provided in a longitudinal direction. Stripping the aluminum stranded wire layer on the outer periphery of the end of the wire to expose the steel stranded wire slightly longer (L) than the depth (l) of the steel stranded wire insertion hole of the steel clamp; Insert the steel stranded wire into the steel clamp insertion hole with the aluminum clamp inserted in the steel core aluminum stranded wire through the hole in the steel core, and insert the steel clamp insertion hole part from the outside. The process of compressing and transferring the aluminum clamp to the steel clamp And a press-fitting hole provided in the radial direction of the aluminum clamp at a position between the end of the steel clamp and the tip of the aluminum stranded wire layer, and the step of covering the aluminum stranded wire layer and the steel clamp. And a step of press-fitting a moisture-curing silicone filler in the form of a paste and filling the silicone filler until the silicone filler leaks from the end of the aluminum clamp.
[0005]
The moisture-curing type silicone filler is in the form of a gel or paste at the time of filling, and is cured in the air at normal temperature during use to become a rubber-like elastic body having adhesiveness. Therefore, as described above, the moisture-curable silicone filler filled in the aluminum clamp, strongly adhered to the steel core aluminum stranded wire in compressed aluminum clamp, fill the voids of aluminum clamp, also, Cracks do not occur due to changes in the outside air temperature. Therefore, moisture such as rainwater does not enter the aluminum clamp , and a stable steel core aluminum stranded wire and a holding clamp connection portion can be formed.
In addition, the property before hardening of the said silicone filler is a gel form or paste form which has moderate softness | flexibility.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
FIG. 1 is an explanatory view of an embodiment of a method for connecting a steel core aluminum stranded wire to a retaining clamp according to the present invention. In this embodiment, a steel core aluminum stranded wire is connected to a tension-type retaining clamp. In the figure, 3 is a steel core aluminum stranded wire, and an aluminum stranded wire layer 4 is provided on the outer periphery of the steel stranded wire 5. Reference numeral 1 denotes a steel clamp having an insertion hole 6 having a depth l into which a steel stranded wire 5 is inserted. An aluminum clamp 2 is provided with a hole 16 through which the steel clamp 1 and the steel core aluminum strand 3 are inserted in the longitudinal direction, and a press-fitting hole 7 into which a filler is press-fitted in the radial direction in the middle part. Is formed so as to penetrate the hole 16 while forming a screw hole. 12 is a jumper terminal, 13 is a jumper sleeve, and 14 is a jumper wire.
[0007]
A method of connecting the steel core aluminum stranded wire of the present embodiment to the holding clamp is as follows . That is,
1) First, the aluminum stranded wire layer 4 on the outer periphery of the end portion of the steel core aluminum stranded wire 3 is stepped to expose the steel stranded wire 5. At this time, the exposed length L of the steel stranded wire 5 is slightly longer than the depth l of the insertion hole 6 of the steel stranded wire 5 of the steel clamp 1.
2) Next, in a state where the aluminum clamp 2 is attached to the steel core aluminum stranded wire 3 in advance so as to penetrate the steel core aluminum stranded wire 3 into the hole 16 and expose the exposed steel stranded wire 5. The stranded wire 5 is inserted into the insertion hole 6 of the steel clamp 1, and the portion of the insertion hole 6 of the steel clamp 1 is compressed from the outside with a hydraulic compressor or the like.
3) Next, the aluminum clamp 2 is moved to the steel clamp 1 and covered over the aluminum stranded wire layer 4 and the steel clamp 1. Thereafter, the injection pump 8 is screwed into the press-fitting hole 7 provided in the aluminum clamp 2, and the handle 9 of the injection pump 8 is rotated to form a moisture-curing type silicone filler 10 (for example, Shin-Etsu Polymer (for example, Shin-Etsu Polymer)). Co., Ltd., silicone sealant SA-45) is press-fitted into the aluminum clamp 2 and filled.
If the silicone filler 10 is press-fitted into the aluminum clamp 2, the silicone filler 10 leaks from the end of the aluminum clamp 2, and at this point, the silicone filler 10 is filled into the aluminum clamp 2. It is assumed that
4) Next, a stopper plug 11 is attached to the press-fitting hole 7, and the entire aluminum clamp 2 is compressed. In this state, the silicone filler 10 is cured when held at room temperature for about a day and night.
5) Finally, the aluminum clamp 2 is attached to the jumper terminal 12 with a bolt 15 and the steel core aluminum stranded wire 3 and the jumper wire 14 are electrically joined.
[0008]
In the connection portion formed in this way, the silicone filler 10 press-fitted into the aluminum clamp 2 is cured into a rubber-like elastic body, filling the gap in the aluminum clamp 2, and the steel stranded wire 5 and aluminum. It is firmly bonded to the stranded wire layer 4. Therefore, it is possible to prevent moisture such as rainwater from entering the aluminum clamp 2 more effectively than before, and to form a stable connection portion having weather resistance.
[0009]
In the above embodiment, the silicone filler 10 is press-fitted into the aluminum clamp 2 and filled. However, the silicone filler 10 is applied to the aluminum stranded wire layer 4 in advance, and then the silicone filler 10 is press-fitted thereon. Then, it can be filled more reliably.
Further, when colored silicone filler 10, Ru can a variety of connection portions to easily identifiable.
[0010]
【The invention's effect】
As described above, according to the present invention, there are excellent effects that waterproofness is improved and stable reliability is obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of a connection portion of twisted electric wires according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel clamp 2 Aluminum clamp 3 Steel core aluminum strand wire 4 Aluminum strand wire layer 5 Steel strand wire 6 Insertion hole 7 Press-fit hole 8 Injection pump 9 Handle 10 Silicone filler 11 Stopper 12 Jumper terminal 13 Jumper sleeve 14 Jumper wire 15 Bolt 16 holes

Claims (1)

A steel core aluminum stranded wire having an aluminum stranded wire layer on the outer periphery of the steel stranded wire, a steel clamp having an insertion hole having a depth (l) into which the steel stranded wire is inserted, and the steel clamp and the steel core aluminum stranded wire. It is a method of connecting to a clamping clamp consisting of an aluminum clamp provided with a hole through which a wire is inserted in the longitudinal direction,
Step of stripping the aluminum stranded wire layer at the outer periphery of the end of the steel core aluminum stranded wire to expose the steel stranded wire slightly longer (L) than the depth (l) of the steel stranded wire insertion hole of the steel clamp When,
Insert the steel stranded wire into the insertion hole of the steel clamp with the aluminum clamp inserted into the steel core aluminum stranded wire in advance with the steel core aluminum stranded wire passing through the hole of the aluminum clamp. Compressing from the outside;
The process of moving the aluminum clamp to the steel clamp and covering the aluminum stranded wire layer and the steel clamp,
At a position between the end of the steel clamp and the tip of the aluminum stranded wire layer, a paste-like moisture-curing silicone filler is press-fitted from a press-fitting hole provided in the radial direction of the aluminum clamp to form aluminum. Filling the silicone filler until the silicone filler leaks from the end of the clamp, and connecting the steel core aluminum stranded wire to the clamp.

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