JP3342208B2 - How to replace wedge-shaped clamps and existing clamps - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wedge-shaped holding clamp for removing an existing compression-type holding clamp in which an abnormality has occurred and re-holding an electric wire, and a method for replacing the same.

[0002]

2. Description of the Related Art In a compression type end clamp, as shown in FIG. 7, a span-side wire 50 and a jumper-side wire 52 are cut off, and the end of the span-side wire 50 is clamped to a clamp body 5.
4, the end of the jumper-side electric wire 52 is compression-connected to the jumper socket 56, and the clamp body 54 and the jumper socket 56 are tightened and fixed by bolts and nuts. In the retention clamp having such a structure, the compression connection between the span side wire 50 and the clamp body 54, the compression connection between the jumper side wire 52 and the jumper socket 56, and the compression connection between the clamp body 54 and the jumper socket 56 due to aging and the like. An abnormality such as heat generation may occur due to an increase in the electric resistance of the connection portion.

If such an abnormality occurs, it is necessary to repair the clamp such as replacing the retaining clamp. However,
The span-side wire 50 and the jumper-side wire 52 are compression-connected to the retention clamp, and it is difficult to replace the retention clamp without disassembling and cutting the wire. Therefore, the following repair methods can be considered. First, the span-side electric wire 50 is cut outside and near the end clamp, and its cut end is compression-connected to a new end clamp. The shortage of the span-side electric wire 50 due to the cutting is as follows:
Increase the length of the clamp of the clamp to compensate. In addition, if the entire span-side electric wire 50 is replaced, the repair can be performed without using a particularly long holding clamp of the holding bracket. In addition, if the length of the span-side electric wire 50 is insufficient, it is conceivable that a new electric wire having an appropriate length is supplemented by compression connection with a sleeve, and the supplemented electric wire is compression-connected to the retention clamp.

[0004]

The above-mentioned repair method includes:
Each has the following problems. First, in the method of compensating for the shortage of the length of the span-side electric wire 50 with the length of the retaining bracket of the retaining clamp, the position and shape of the jumper-side electric wire 52 are changed by shifting the position of the retaining clamp as a whole. There is a problem that it shifts. The shape of the jumper-side electric wire 52 defines the distance between the upper arm and the lower arm provided on the tower, and it is not desirable that the shape of the jumper-side electric wire 52 be changed by repair. In addition, it is clear that it is not economical to replace the entire span-side electric wire 50.

[0005] Further, in the method of compensating for the lack of the length of the span-side electric wire 50 by compressing and connecting a new electric wire of an appropriate length with a sleeve, the mechanical strength of the compression connection portion is reduced. Anxiety will newly arise.

The present invention has been made in view of the circumstances of the related art, and has as its object to provide a wedge-shaped holding clamp suitable for replacing an existing compression-type holding clamp in which an abnormality has occurred, and a method of replacing the same. I do.

[0007]

In order to achieve the above object, the wedge-shaped clamp according to the present invention is connected to one end of a metal fitting having a length sufficient to compensate for the shortage of the span-side electric wire. A wedge for holding the span-side electric wire is inserted into the clamp body, one end of which is connected to the wedge, and the other end of the support bracket having a length sufficient to compensate for the shortage of the span-side electric wire. In addition, a wire fixing bracket for fixing the jumper-side electric wire and a jumper bracket are provided in the section, and a steadying bracket for fixing the other end of the support bracket to the other end of the retaining bracket is provided.

Further, the jumper fitting is separate from the support fitting, the jumper fitting is swingable with a bolt nut with respect to the support fitting, and the jumper fitting and the jumper fitting are brought into contact with each other by tightening the bolt nut. The contact surfaces of the fittings may be provided with concave and convex portions that mesh with each other and inhibit swinging.

[0009] In the replacement method of the existing clamp according to the present invention, in the replacement of the existing clamp, in which the span-side wire and the jumper-side wire are cut and compression-connected by a compression-type retention clamp, the span-side wire is replaced with the above-mentioned wire. 2. A wire which is cut outside and near the compression type clamp and one end of a new jumper-side wire is fusion-bonded to the cut end thereof, and the wedge of the wedge-shaped clamp as claimed in claim 1 is one of said span-side wires at a fusion joint. And fix the new jumper-side electric wire on the opposite side with the fusion joint between the electric wire fixing brackets.

[0010]

In the wedge-shaped retaining clamp according to the first aspect, the wedge provided at one end of the support bracket holds the span-side electric wire, so there is no concern about mechanical strength. And, since the supporting metal has a length sufficient to compensate for the shortage of the span-side electric wire, the jumper-side electric wire fixed to the other end of the supporting metal is
The position and shape of the retaining clamp before and after its replacement are not changed. Furthermore, since the other end of the support fitting is fixed to the retaining fitting with the steady rest, there is no possibility that the support fitting is deformed due to the long support fitting.

Further, in the wedge-shaped retaining clamp according to the second aspect, the angle of the jumper bracket with respect to the support bracket can be appropriately adjusted and securely fixed at that angle, and the jumper-side electric wire can be fixed at a predetermined angle. Can be set appropriately.

According to a third aspect of the present invention, there is provided a method for replacing an existing clamp, in which an end of a span-side electric wire is clamped by a wedge with respect to an existing compression-type retention clamp in which an abnormality has occurred. Since the jumper-side electric wire is fixed to the other end of the long support bracket, the position and the shape of the jumper-side electric wire are not changed by replacing the retaining clamp.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a wedge-shaped retaining clamp and a method for replacing an existing clamp according to the present invention will be described below with reference to FIGS. FIG. 1A is a plan view of one embodiment of a wedge-shaped retaining clamp of the present invention, and FIG. 1B is a side view of FIG. FIG.
FIG. 2A is a side view of a support fitting and a jumper fitting, and FIG. 2B is a partial bottom view of FIG. 2A. FIG.
FIG. 3A is a side view of the jumper bracket alone, and FIG.
(B) is a view on arrow A in FIG. 3 (a). FIG.
FIG. 5B is a cross-sectional view taken along line BB of FIG.
FIG. 6 is a cross-sectional view taken along the line DD in FIG. 1B.

In the figure, the retaining members 10, 10 are set longer than a conventional wedge-shaped retaining clamp, and a clamp body 12 is connected to one end thereof by bolts 14, 14. The clamp body 12 is formed by being divided into two parts,
6, 16 ... are integrated. A pair of wedges 18, 18 are inserted into the clamp body 12 while sandwiching the span side electric wire 20. As shown in FIG. 6, when the wedges 18, 18 are inserted by the cooperation of the outer cross-sectional shape of the wedges 18, 18 and the cross-sectional shape of the inner hole of the clamp body 12, the clamp body 12 becomes 2
It does not break apart.

[0015] One end of a support fitting 22 is connected to one of the wedges 18. The support bracket 22 is set longer by the length of the retention brackets 10, 10, and a wire fixing bracket 26 for fixing the jumper-side wire 24 to the other end.
Is provided. A jumper fitting 28 formed separately is provided at the other end of the support fitting 22 so as to be swingable about a bolt / nut 30 as a swing axis. Radial concave and convex portions 22a and 28a are provided on the contact surfaces of the support fittings 22 and the jumper fittings 28 which are tightened and pressed by the bolts and nuts 30 so as to mesh with each other and inhibit swinging. The jumper-side electric wire 24 is connected to the free end of the jumper fitting 28.
Is provided. The support fitting 22 and the jumper fitting 28 are provided with U-shaped grooves 22b and 28b for receiving electric wires.

Further, from the other end of the support fitting 22, a pair of steady rests 34, 34 are provided so as to project therefrom.
The bolts 4 and 34 are fixed to the retaining fittings 10 and 10 with bolts.

A method for replacing an existing compression type clamp using the wedge-shaped clamp according to the present invention will be described below. First, the span-side electric wire 20 and the jumper-side electric wire 24 are cut outside and near the existing compression type anchoring clamp (the cut portion in FIG. 7). Then, the jumper-side electric wire 24 is set to be longer than the conventional one by using a new electric wire or connecting the electric wire by a compression type jumper sleeve, fusion bonding, or the like. Further, the cut end of the span side electric wire 20 and one end of the jumper side electric wire 24 are fusion-bonded. With the fusion joint 40 as an intermediate point, the span side electric wire 20 is sandwiched and fixed between the wedges 18, 18, and the jumper side electric wire 24 is fixed to the electric wire fixing bracket. Furthermore, an appropriate portion of the jumper-side electric wire 24 is fixed to the jumper metal fitting 28 with the fixing metal 32. Then, the wedges 18, 18 for sandwiching the span-side electric wires 20 are inserted into the clamp body 12, and the other ends of the stay fittings 10, 10 are connected to insulators (not shown) of a steel tower. Furthermore, after loosening the bolts and nuts 30 and appropriately adjusting the angle of the jumper fittings 28, the bolts and nuts 30 are tightened again to fix the jumper fittings 28 to the support fittings 22.

Here, a description will be given of dimensions in which the retaining fittings 10, 10 and the supporting fitting 22 are set to be longer than conventional ones. The span-side electric wire 20 is shortened by an amount cut in the vicinity of the existing compression type anchoring clamp. Further, since the jumper-side electric wire 24 is fusion-bonded to the cut end, the metallurgical properties of the fusion-bonded portion 40 and the heat-affected zones on both sides thereof are changed, and a desired mechanical strength may be lost. is there. Therefore, in order that the wedges 18, 18 can clamp and fix the span-side electric wire 20 at a portion not affected by the heat due to the fusion bonding, the retaining metal fittings 10, 10 and the supporting metal fittings 22 have the conventional dimensions L (FIG. 7). Is set longer than m. As described above, the dimensions of the retaining fittings 10, 10 and the support fitting 22 are set such that the span-side electric wires 20 can be clamped and fixed at the portions where the desired mechanical strength is maintained by the wedges 18, 18. It is set longer than the conventional one, just to make up for the lack of the length.

In the above replacement method, the span-side electric wire 2
0 and the jumper-side electric wire 24 are fusion-bonded, so that the electrical characteristics are good. And since the wedges 18, 18 hold the span-side electric wire 20 to give tension, there is no problem in terms of mechanical strength. The fusion joint 40 and the heat-affected zone on both sides thereof may have a change in metallurgical properties and a drop in mechanical strength. It is fixed at both ends of the metal fitting 22, and no tension is applied to the fusion bonding portion 40, so that there is no concern about mechanical strength. Furthermore, by shortening the length of the spanning-side electric wire 20 by making the retaining metal fittings 10, 10 and the supporting metal fitting 22 longer than the conventional one by a predetermined dimension, the jumper-side electric wire 24 changes its position and shape. You don't have to. When the shape of the jumper-side electric wire 24 is set, the existing shape can be easily set by appropriately adjusting the angle of the jumper fitting 28 and the length thereof. In addition, since the support fitting 22 is set to be long, it is a cantilever and a strong bending stress is applied only when one end is fixed to the clamp body 12 with the wedges 18 as in the conventional case. Then, the steady rest 3
4 and 34, the other end of the support fitting 22 is connected to the retaining fittings 10 and 1.
0, so that the support fitting 22 is not deformed.

In the above embodiment, the span-side electric wire 20 and the jumper-side electric wire 24 are fusion-bonded. However, the present invention is not limited to this, as long as they are connected with excellent electrical characteristics.
You may join using a compression-type sleeve etc. Here, by sandwiching and fixing the span-side electric wire 20 at a portion having a desired mechanical strength by the wedges 18, 18, the mechanical strength in connection between the span-side electric wire 20 and the jumper-side electric wire 24 does not matter. Will be easy to understand. The steady rests 34, 34 may have any structure as long as the other ends of the support fittings 22 can be fixed to the retaining fittings 10, 10. Furthermore, in the above-described embodiment, the retaining fittings 10, 10 are also set to be longer by the shortage length of the span-side electric wire 20, similarly to the support fitting 22, but the present invention is not limited to this, and the retaining fittings 10, 10 are not limited thereto.
May be connected to an insulator of a steel tower or the like via a separate metal fitting to compensate for the shortage.

[0021]

As is apparent from the above description, the wedge-shaped retaining clamp and the method for replacing the existing clamp according to the present invention have the following special effects.

In the wedge-shaped clamp according to the first aspect of the present invention, since the span-side wire cut and shortened is clamped by the wedge, no problem occurs in mechanical strength. Since the supporting bracket has a length that compensates for the shortage of the span-side wire, the jumper-side wire fixed to the other end of the supporting bracket has the same position and shape as the existing one. Can be done. Since the other end of the support bracket is fixed to the retaining bracket by the steady rest, the support bracket is not deformed even if it is long, so that the shape of the jumper-side electric wire can be reliably held.

In the wedge-shaped retaining clamp according to the present invention, the adjusted angle of the jumper fitting with respect to the support fitting can be reliably fixed by engagement of the concave and convex portions. This is suitable for appropriately setting the shape such as the jumper depth of the electric wire.

In the method for replacing an existing clamp according to the third aspect of the present invention, there is no concern about mechanical strength, and the shape of the jumper-side electric wire is the same as that of the existing one. Can be set. Moreover, since the span-side wire and the jumper-side wire are melt-bonded, the electrical characteristics do not deteriorate due to aging.

[Brief description of the drawings]

FIG. 1 (a) is a plan view of an embodiment of a wedge-shaped retaining clamp of the present invention, and FIG. 1 (b) is a side view of (a) in which a retaining bracket is partially cut away.

FIG. 2A is a side view of a support fitting and a jumper fitting, and FIG. 2B is a partial bottom view of FIG.

FIG. 3A is a side view of a jumper bracket alone;
(B) is a view on arrow A of (a).

FIG. 4 is a sectional view taken along line BB of FIG. 1 (b).

FIG. 5 is a sectional view taken along the line CC of FIG. 1 (b).

FIG. 6 is a sectional view taken along line DD of FIG. 1 (b).

FIG. 7 is a side view of the compression type clamp;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Retention fitting 12 Clamp main body 18 Wedge 20 Intermediate wire 22 Support fitting 22a, 28a Irregularities 24 Jumper-side wire 26 Wire fixing fitting 28 Jumper fitting 30 Bolt / Nut 34 Anti-sway fitting 40 Melting joint

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Eiji Nishida 1-8-1, Hisamoto, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Asahi Electric Co., Ltd. (56) References JP-A-2-229942 (JP, A) Hei 5-67136 (JP, U) Actually open Hei 1-90233 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) H02G 7/00 H02G 1/02

Claims (3)

(57) [Claims] 1. A clamp body connected to one end of an end fitting having a length sufficient to compensate for the shortage of the span side electric wire,
A wedge for holding the span-side electric wire is inserted, and one end is connected to the wedge, and a jumper is mounted on the other end of the support bracket having a length sufficient to compensate for the shortage of the span-side electric wire. A wedge-shaped retaining clamp, comprising a wire fixing bracket for fixing a side electric wire and a jumper fitting, and a steady rest fitting for fixing the other end of the support fitting to the other end of the retaining fitting. 2. The wedge-shaped retaining clamp according to claim 1, wherein the jumper fitting is separate from the support fitting, and the jumper fitting is swingable with respect to the support fitting by a bolt nut. A wedge-shaped clamping clamp, wherein the supporting metal and the jumper metal are brought into contact with each other by the tightening of the above, and the projections and depressions are provided so as to mesh with each other and inhibit swinging. 3. The replacement of an existing clamp, in which a span-side wire and a jumper-side wire are cut out and compression-connected by a compression-type stay clamp, cut the span-side wire outside and near the compression-type stay clamp. The other end of the new jumper-side electric wire is fusion-bonded to the cut end thereof, and the wedge of the wedge-shaped retention clamp according to claim 1 is used to hold and fix the intermediate wire on one side of the fusion-bonded portion. A method of replacing an existing clamp, comprising fixing the new jumper-side electric wire on the opposite side across the fusion joint.