JPS6046609B2 - Method of forming a dead end in a power transmission line conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a tie end in a power transmission line conductor, and more specifically, a method for forming a tie end in a power transmission line conductor, and more specifically, even if a gap exists in a tie clamp compressed and fixed to the conductor end of a power transmission line. The present invention relates to a method of forming a tie end in a power transmission line conductor to prevent rainwater from entering.

As shown in FIG. 1, the conventional method of forming a tie end in a power transmission line conductor is as follows:
The aluminum stranded wire layer 5 at the end portions of the aluminum stranded wire layer 5 is flooded to expose the steel stranded wires 4 at the center over an appropriate length.

Next, the steel sleeve 3 of the steel clamp 8 is fitted onto the outside of the exposed steel strands 4, and this is sequentially crimped along the longitudinal direction of the steel strands 4 from the distal end side thereof. Next, in order to make the outer diameter of the steel sleeve 3 after crimping substantially equal to the outer diameter of the aluminum stranded wire layer 5 and to prevent a gap from forming inside the retaining clamp, the outer periphery of the steel sleeve 2 is Cover the collar 9, and then cover the aluminum jacket sleeve 7 with the conductor 2.
and a steel clamp 8, which is crimped to form the dead end of the power line conductor. However,
In the above-described forming method, the steel sleeve 3 undergoes compressive elongation toward its distal end during crimping, so the exposed length L of the steel strands 4 is adjusted to allow for the compressive elongation of the steel sleeve 3.
However, in general, there is a tendency to make the exposed length L longer than necessary in view of safety. Therefore, the steel sleeve 3 is The end face of the twisted aluminum wire layer 5 and the end face of the twisted aluminum wire layer 5 do not come into close contact with each other, and a gap 10 having a length of 1 often remains between them.

However, if such a gap 10 exists in the retaining clamp, rainwater may enter and accumulate in the gap 10 through the gaps between the twisted wires in the conductor 2, and the accumulated water may freeze during cold weather such as winter. Due to the expansion, a huge expansion pressure is generated in the gap 10, which may eventually lead to an accident in which the aluminum jacket sleeve 7 is destroyed. Conventionally, aluminum binding wire has been wrapped around the gap 10 in order to fill the gaps generated by the gap 10 as described above, but this method is difficult to manage on-site. Attachment requires skill and skill, and even if it appears to be done well, it is extremely difficult to actually completely fill the void 10 and reliably prevent rainwater from entering. An object of the present invention is to provide a method for forming a retaining end in a power transmission line conductor, which can reliably prevent rainwater from entering and staying there even if there is a gap in the retaining clamp. That is.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIGS. 2 and 3 show an embodiment of the method of the present invention. First, as shown in FIG. , the aluminum stranded wire layer 5 at the end of the power transmission line conductor 2 is stripped off in stages to expose the steel stranded wire 4 located at the center thereof.

Next, the steel sleeve 3 of the steel clamp 8, in which the outer diameter of at least the tip 1 is made equal to the outer diameter of the conductor 2, is connected to the stranded steel wire until the end surface of the tip 1 comes into close contact with the end surface of the aluminum stranded wire layer 5. 4 Insert it on top. Next, while maintaining the above-mentioned state in which the end surface of the tip portion 1 of the steel sleeve 3 is brought into close contact with the end surface of the aluminum stranded wire layer 5, the steel sleeve 3 is shown in the figure from the tip portion 1 side toward the locking terminal portion 6 side. The steel sleeve 3 is compressed in the reverse direction sequentially as shown by the arrows, and the steel sleeve 3 is brought into close contact with the end face of the tip 1 and the end face of the aluminum stranded wire layer 5 without creating a gap between them. It is crimped and fixed onto the steel stranded wire 4. Next, as shown in FIG. 3, an aluminum jacket sleeve 7 is placed over the conductor 2 and the steel clamp 8 near the end of the aluminum stranded wire layer 5, and the aluminum jacket sleeve 7 is placed over the conductor 2 and the steel clamp 8. 8, and the main working steps of this invention are completed. According to this invention, the steel sleeve 3 is placed on the steel strands 4 while keeping the end surface of the tip portion 1 having an outer diameter equal to the outer diameter of the conductor 2 in close contact with the end surface of the aluminum strand layer 5. After the reverse compression fixation, the aluminum jacket sleeve 7 is crimped and fixed over the aluminum stranded wire layer 5 and the steel sleeve 3, so that the aluminum jacket sleeve 7
After crimping and fixing, even if there is a gap in the retaining clamp, there is no room for rainwater to infiltrate into that part, and therefore, rainwater that has entered and accumulated in the retaining clamp freezes and expands, causing damage to the aluminum surface. Accidents of damage to the sleeve 7 can be reliably prevented, and there is no need to prepare an aluminum collar to fill the gap in the retaining clamp or to wrap a binding wire around the gap. Effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-away side view showing the main part of the tie end of a power transmission line conductor formed by the conventional method, and FIGS. 2 and 3 show the tie end of a power transmission line conductor formed by the method of the present invention. FIG. 3 is a partially cutaway side view showing an embodiment in a state where an end portion is formed. In the figure, 1 is the tip, 2 is the transmission line conductor, 3 is the steel sleeve, 4 is the steel stranded wire, 5 is the aluminum stranded wire layer, 6 is the dead terminal, 7 is the aluminum jacket sleeve, and 8 is the steel clamp. be.

Claims (1)

[Claims] 1. A steel sleeve 3 whose outer diameter at least at the tip end 1 is equal to the outer diameter of the conductor 2 is inserted into the outer side of the exposed steel stranded wire 4 by stripping the end of the conductor 2, and While maintaining the end face of the tip portion 1 of the steel sleeve 3 in close contact with the end face of the aluminum stranded wire layer 5, the steel sleeve 3
are sequentially compressed and fixed onto the steel stranded wire 4 from the end face side toward the locking terminal portion 6 side, and then the aluminum jacket sleeve 7 is crimped and fixed over the aluminum stranded wire layer 5 and the steel sleeve 3. A method for forming a tie end in a power transmission line conductor, characterized in that: