JPH08331720A - Installing method for clamp for electric wire - Google Patents

Abstract

PURPOSE: To prevent omission to tighten with reliability by clamping an electric wire between a clamp body and a clamp cap in proximity to a steel tower, compressing an elastic body to its final compression position, inserting a widening member between the clamp body and cap, moving the clamp assembly to a specified position on the electric wire, and removing the widening member. CONSTITUTION: A clamp body 13 and a clamp cap 15 are installed on an electric wire 11 in proximity to a steel tower. An eccentric cam 27 is operated to compress a coil spring 25 to its final compression position, and the electric wire 11 is thereby firmly clamped. A wedge-shaped widening member 50 is driven in between the clamp body 13 and the clamp cap 5 against the compressive force of the coil spring 25 to widen the gap between the body and the cap. The clamp body 13 and clamp cap 15 are moved to a specified position on the electric wire 11, and then the widening member 50 is removed. This simplifies and facilitates clamp installation work, and prevents the clamp from being omitted to tighten with reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire clamp mounting method in which a clamp body for holding an electric wire and a clamp cap are tightened by utilizing the compression repulsive force of an elastic body.

[0002]

2. Description of the Related Art Generally, a spacer, an anti-twist damper, an interphase spacer, etc. are attached to an overhead wire (overhead power line, overhead ground wire, etc.) by a wire clamp. There are various types of electric wire clamps. Among them, there is an electric wire clamp in which the clamp body and the clamp cap are tightened by utilizing the compression repulsive force of the elastic body. An example of such a wire clamp will be described with reference to FIGS. 7 to 10. That is, the electric wire clamp includes the clamp body 13 that holds the electric wire 11 and the clamp cap 15. This clamp body 1
3, the clamp cap 15 and the clamp cap 15 are openably and closably coupled to each other on one side of the wire gripping grooves 17 and 19 by a hinge portion 20, and on the opposite side, a tightening rod 23, a coil spring 25,
It is adapted to be tightened by a tightening mechanism 21 composed of an eccentric cam 27 and the like.

The tightening rod 23 of the tightening mechanism 21 penetrates through the clamp body 13 and has a T-shaped engaging portion 29 (see FIGS. 9 and 10) which engages with the open end side of the clamp cap 15 at one end thereof. The eccentric cam 27 is rotatably attached to the other end by a shaft pin 31. Further, the coil spring 25, together with the washer 33, has the eccentric cam 27 and the clamp body 1 with the tightening rod 23 inserted therethrough.
It is located between the three.

On the open end side of the clamp cap 15, the T-shaped engaging portion 29 of the tightening rod 23 is provided with a notch (or a long hole) 35 through which the T-shaped engaging portion 29 of the tightening rod 23 can pass when it is oriented in the direction perpendicular to the electric wire, and is oriented in the direction parallel to the electric wire 11. And a stepped portion 37 that is hooked with. That is, the clamp cap 15 can be opened and closed when the T-shaped engaging portion 29 of the tightening rod 23 is oriented in the direction perpendicular to the electric wire 11, and the clamp cap 15 can be opened and closed.
When 3 is rotated 90 °, the T-shaped engaging portion 29 is caught by the step portion 37 and cannot be opened. A stopper wall 39 is formed on the step portion 37 to prevent the T-shaped engaging portion 29 from rotating by 90 ° or more.

Further, the eccentric cam 27 rotates about the shaft pin 31 and can be in a state where the coil spring 25 is compressed as shown in FIG. 9 or a state where the coil spring 25 is not compressed as shown in FIG. The eccentric cam 27 is U-shaped as shown in FIG. 7, and has a bent portion formed with a hole 41 for turning operation.

Next, a procedure for gripping an electric wire with this electric wire clamp will be described. First, the eccentric cam 27 is set in a state where the coil spring 25 is not compressed as shown in FIG. Next, the electric wire 11 is inserted between the clamp body 13 and the clamp cap 15, and the clamp cap 15 is closed.
Rotate it by 0 ° to move the T-shaped engaging portion 29 to the clamp cap 1
5 is engaged. Next, as shown in FIG.
Insert the operating rod 43 into the hole 41 of the
° Rotate. Then, as shown in FIGS. 8 and 9, the eccentric cam 27 compresses the coil spring 25, and the repulsive force clamps the clamp body 13 and the clamp cap 15 to firmly grip the electric wire 11.

The operation of tightly gripping the electric wire 11 by tightening the clamp body and the clamp cap described above is carried out by a person riding on an airborne suspender suspended on the electric wire and moving on the electric wire to move the electric wire 11 at a predetermined position. It is done by stopping the spacecraft and operating the eccentric cam at that position.

[0008]

However, the number of electric wire clamps attached to one power transmission line is very large, which causes a problem of forgetting to tighten the electric wire clamp. In particular, spacers used in multi-conductor transmission lines with four or more conductors have four or more electric wire clamps, which is the same as the number of transmission lines in one spacer, and therefore the number of electric wire clamps is very large. It is easy to forget to tighten. There is also a problem that work on an airborne device requires a lot of time because it is work on an unstable electric wire.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a method for attaching an electric wire clamp which can prevent forgetting to tighten the electric wire clamp and is easy to work. A method for mounting a wire clamp, in which a clamp body that holds an electric wire and a clamp cap are tightened by using a compression repulsive force of an elastic body.First, grip the electric wire near the tower with the clamp body and the clamp cap. The elastic body is compressed to the final compression position, and an expanding member is inserted between the clamp body and the clamp cap so that the clamp body and the clamp cap can move on the wire. Slide and on the wire to the specified position, and finally remove the expanding member inserted between the clamp body and the clamp cap. Characterized by fixing the clamp body and the clamping cap wire by utilizing the compression repulsive force of the elastic body.

[0010]

[Operation] In the vicinity of the steel tower where the electric wire does not shake easily, the electric wire is grasped by the clamp body and the clamp cap to compress the elastic body to the final compression position, and the expanding body is inserted between the clamp body and the clamp cap to clamp. Since the main body and the clamp cap are configured to move on the electric wire, the work can be easily performed in a short time. Also, after sliding the clamp body and the clamp cap on the wire to a predetermined position, simply removing the expanding member inserted between the clamp body and the clamp cap makes use of the compression repulsive force of the elastic body. Since the clamp body and the clamp cap can be fixed to the electric wire, the work can be easily performed in a short time. Further, by counting the number of the expanded diameter members that have been removed, it can be easily confirmed whether or not the expanded diameter members have been forgotten to be removed, so that it is possible to reliably prevent forgetting to tighten the wire clamp.

[0011]

The present invention will be described in detail below with reference to the drawings. 1 and 2 show an embodiment of the present invention. The same parts as those in FIG. 7 to FIG. 10 described above are designated by the same reference numerals and the description thereof will be omitted.

In the present invention, first, the following work is performed near the steel tower. First, the clamp body 13 and the clamp cap 15 are attached to the electric wire 11 near the steel tower. Next, the eccentric cam 2
7 is operated to compress the coil spring 25 to the final compression position and the clamp body 13 and the clamp cap 15 are tightened by the repulsive force, whereby the clamp body 13 and the clamp cap 15 firmly grip the electric wire 11. In this state, the clamp body 13 and the clamp cap 15 cannot move on the electric wire 11.

Next, the space between the clamp body 13 and the clamp cap 15 is widened against the compressive force of the coil spring 25. To widen the space between the clamp body 13 and the clamp cap 15, a wedge-shaped expanding member 50 is driven between the clamp body 13 and the clamp cap 15. As the wedge-shaped expanding member 50, as shown in FIG. 3 (a), a wedge-shaped member having a tightening rod insertion groove 50a in the central portion, and as shown in FIG. 3 (b), both ends are tapered. A wedge-shaped member obtained by bending a rod body 50b into a U shape, as shown in FIG. 3C, a cylindrical portion 5 having an outer diameter larger than the maximum outer diameter of the conical portion 50c and the conical portion 51c.
It is possible to use a wedge-shaped member in which 0d and a jaw 50e having an outer diameter larger than the outer diameter of the cylindrical portion 51d are sequentially formed. The diameter expanding member 50 is formed of metal, hard rubber, hard plastic, or the like. The diameter expanding member 50 is attached to the clamp body 13
The work of driving between the clamp cap 15 and the clamp cap 15 may be performed manually, or by using a hydraulic cylinder, a hydraulic motor,
Alternatively, a machine such as an electric motor may be used.

By driving the expanding member 50 between the clamp body 13 and the clamp cap 15, the coil spring 25 is compressed and the space between the clamp body 13 and the clamp cap 15 is opened. This allows the clamp body 13
The clamp cap 15 and the clamp cap 15 can move on the electric wire 11. In addition, for example, since a spacer for a 6-conductor power transmission line is provided with 6 electric wire clamps, the above work is performed for each electric wire clamp.

After the above work is completed, the clamp body 13 and the clamp cap 15 are moved on the electric wire 11 to be positioned at predetermined positions. This work can be easily carried out by a person on the airborne vehicle by moving a spacer or the like.

Clamp body 13 and clamp cap 15
After the and are moved on the electric wire 11 to be positioned at a predetermined position, the expanding member 50 is removed from between the clamp body 13 and the clamp cap 15. In order to remove the expanding member 50 from between the clamp body 13 and the clamp cap 15, the expanding member 50 may be manually removed, but when it is difficult to remove it manually, as shown in FIGS. However, it can be easily removed by using the extraction jig 57 in which the extraction wedge 56 is attached to the hydraulic cylinder 55. That is, by utilizing the force of the hydraulic cylinder 55, the clamp body 13 and the clamp cap 1
Tightening rod insertion groove 5 of the expanding member 50 protruding from 5
When the extraction wedge 56 is pushed into 0a, the diameter expansion member 50
Comes out easily. If the extraction jig 57 is provided for each clamp, the hydraulic cylinders 55 can be operated at the same time, so that the clamp mounting work can be performed in a short time.

The extraction jig 57 is shown in FIG.
As shown in (a) and (b), the hydraulic cylinder 55 may be connected to the extraction wedge 56 having the cylindrical portion insertion groove 56a. The extracting jig 57 is used when the expanding member 50 having the structure shown in FIG. 3C is used. That is, when the expanding member 50 having the structure shown in FIG. 3C inserted between the clamp main body 13 and the clamp cap 15 is removed, the cylindrical portion 50a of the expanding member 50 has a cylindrical shape of the extracting jig 57. Part insertion groove 56a
Is inserted and the hydraulic cylinder 55 pushes it in to remove the diameter expansion member 50. The structure of the extraction jig is not limited to the structure of the above embodiment, and an electric motor or a hydraulic motor may be used instead of the hydraulic cylinder, for example.

Clamp body 13 and clamp cap 15
When the diameter expanding member 50 is removed from between, the compressed coil spring 25 extends and the clamp body 13 and the clamp cap 15 firmly grip the electric wire 11. At this time, since the coil spring 25 has been compressed to the final compression position from the beginning, it is not necessary to perform a troublesome operation of compressing it again.

FIG. 6 shows another embodiment of the present invention.
A hard plastic cylinder 70 having a cut 71 for covering the electric wire 11 is interposed between the electric wire 11 and the clamp body 13 / clamp cap 15. In this way, the clamp body 13 and the clamp cap 1
5 is moved together with the hard plastic tubular body 70, the clamp body 13 and the clamp cap 15 move to the electric wire 1.
1, the hard plastic is generally softer than the electric wire 11, so that the electric wire 11 is not damaged even when the clamp body 13 and the clamp cap 15 move on the electric wire 11. In FIG. 6, reference numeral 60 is a spacer frame. Since the other parts are the same as those in the above-mentioned embodiment, the same reference numerals are given and the description thereof is omitted.

The electric wire clamp used in the present invention is
The present invention is not limited to the above-mentioned embodiments, and for example, instead of the coil spring, a rubber-like elastic body or a leaf spring elastic body may be used. Also, the means for compressing the elastic body is not particularly limited. Further, in the above-mentioned embodiment, after the electric wire is grasped by the clamp body and the clamp cap to compress the elastic body to the final compression position, the expanding member is inserted between the clamp body and the clamp cap. Alternatively, a diameter-expanding member may be inserted between the clamp body and the clamp cap, and then the elastic body may be compressed to the final compression position. Further, the shape and material of the expanding member and the method of inserting the expanding member between the clamp body and the clamp cap are not particularly limited.
Furthermore, the method of removing the diameter expanding member from between the clamp body and the clamp cap is not particularly limited.

Further, it is preferable that the clamp body 13 and the clamp cap 15 can smoothly move on the electric wire. For this purpose, the diameter expanding member 50 is interposed between the clamp body 13 and the clamp cap 15. When
The inner diameters of the wire holding grooves 17 and 19 of the clamp body 13 and the clamp cap 15 need to be considerably larger than the outer diameter of the electric wire 11. As a measure for this, even when the elastic body is compressed to the final compression position, the diameter expansion member 50
Is used to adjust the elasticity of the elastic body so that the elastic body is in a more compressed state, or the position of the elastic body is brought closer to the electric wire 11 side or the hinge portion 20 and the electric wire 11 By increasing the distance,
There is a method of effectively utilizing the opening between the clamp body 13 and the clamp cap 15. According to the experiment,
It has been clarified that the gap between the inner diameters of the electric wire grip grooves 17 and 19 of the clamp body 13 and the clamp cap 15 and the outer diameter of the electric wire 11 is preferably 3 mm or more.

[0022]

As described above, according to the method for attaching the electric wire clamp of the present invention, the electric wire is compressed to the final compression position by gripping the electric wire with the clamp body and the clamp cap in the vicinity of the tower where the electric wire is hard to shake. In addition, since the diameter expanding member is inserted between the clamp body and the clamp cap so that the clamp body and the clamp cap can move on the electric wire, the work can be easily performed in a short time. In addition, after sliding the clamp body and clamp cap on the wire to a predetermined position, simply remove the diameter expansion member inserted between the clamp body and clamp cap,
Since the clamp body and the clamp cap can be fixed to the electric wire by utilizing the compression repulsive force of the elastic body, the work can be easily performed in a short time, and automation can be performed. Further, by counting the number of the expanded diameter members that have been removed, it is possible to easily confirm whether or not the expanded diameter member has been forgotten to be removed, so that it is possible to reliably prevent forgetting to tighten the electric wire clamp.

[Brief description of drawings]

FIG. 1 is a plan view showing a state where a diameter-expanding member is driven in in the method for attaching the electric wire clamp according to the present invention.

FIG. 2 is a front view of FIG.

3 (a), (b) and (c) are explanatory views showing different examples of the diameter expanding member used in the present invention.

4 (a) and (b) are a front view and a side view showing an embodiment of the extraction jig used in the present invention.

5A and 5B are a front view and a side view showing another embodiment of the extraction jig used in the present invention.

FIG. 6 is a perspective view showing another embodiment of the method for attaching the electric wire clamp according to the present invention in a state where the diameter-expanding member is driven in.

FIG. 7 is a plan view of a wire clamp.

8 is a front view of FIG. 7. FIG.

9 is a cross-sectional view taken along the line AA of FIG.

10 is a cross-sectional view showing the non-tightened state of FIG.

[Explanation of symbols]

 11 wire 13 clamp body 15 clamp cap 17, 19 wire grip groove 20 hinge part 21 tightening mechanism 23 tightening rod 25 coil spring 27 eccentric cam 50 diameter expansion member 57 extraction jig

Continuation of the front page (72) Inventor Ryuji Mikami 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (1)

[Claims] 1. A method of mounting a clamp for an electric wire, comprising: clamping a clamp body for clamping an electric wire and a clamp cap by utilizing a compression repulsive force of an elastic body. First, the clamp body and the clamp cap are provided near a steel tower. Hold the wire to compress the elastic body to the final compression position and insert a diameter expansion member between the clamp body and the clamp cap so that the clamp body and the clamp cap can move on the wire. Slide the clamp body and the clamp cap on the wire to the specified position, and finally remove the expanding member inserted between the clamp body and the clamp cap, and use the compression repulsive force of the elastic body to clamp. A method for mounting an electric wire clamp, characterized in that the main body and the clamp cap are fixed to the electric wire.