JP2003224923A - Wedge-shaped anchor clamp and cable anchoring construction using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wedge-shaped anchor clamp that can reduce the stress on the cable in proximity to the clamp opening. <P>SOLUTION: The wedge-shaped anchor clamp 1 has the wedge 11 side connected to the arm 3 of the support via insulators 7, 8. The clamp body 12 is engaged to the wedge 11 from the side of the insulator 7 and grips a cable 2 between itself and the wedge 11 through a wedging action. A cable insertion direction a of the wedge-shaped anchor clamp is maintained at an angle (cable angle θ) with respect to the cable anchoring direction b. The cable angle θcan be made small, for example 40° or smaller, thereby allowing the bending stress on the cable close to the clamp opening to be reduced. The cable angle θis made 10° or larger to prevent disconnection through a flashover, when a lightning occurs and to avoid contact between the cable and the insulators. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wedge-shaped retaining clamp having a structure in which a wedge side is connected to a support such as a utility pole, and an electric wire retaining structure for retaining an electric wire in the support by using the clamp.

[0002]

2. Description of the Related Art A wedge type detention clamp has a structure in which an electric wire is sandwiched between a clamp body and a wedge and the electric wire is gripped by a wedge action, but the clamp body side is connected to an insulator on a support side. (It is called the clamp body side connection method)
There is a structure that connects the wedge side to the insulator on the support side (called the wedge side connection method).

FIG. 5 shows a conventional wedge-shaped detention clamp 31 of the clamp body side connection type, in which a wedge 33 is driven into a clamp body 32 connected to an insulator (not shown) to grip an electric wire (electric wire conductor) 2. To do. This clamp body side connection method is intended to make a edging wire that bypasses the support and the insulator, and grips the wire 2 at a constant angle θ with respect to the wire retaining direction (direction of arrow b). That is, the structure has an electric wire angle θ formed by the electric wire retaining direction (arrow b direction) and the electric wire insertion direction (arrow c direction).

FIG. 6 shows a wedge-type strain-tightening clamp 35 of a conventional wedge-side connecting type. A clamp main body 37 is fitted to a wedge 36 connected to an insulator, and the clamp main body 3
The protruding portion 37a of 7 is struck in the direction of the arrow to grip the electric wire 2 by the wedge action. This wedge-side connection method does not particularly consider the edging work that bypasses the support and the insulator, and is used only when the electric wire 2 is held straight (when the electric wire angle is zero). That is, FIG.
As shown in, the wire insertion direction d is the wire retention direction (arrow b).
Direction) parallel to.

FIG. 7 shows the whole electric wire retaining structure for retaining the electric wire 2 on the arm pole 3 of the electric pole by using the wedge type detention clamp 31 of the clamp body side connecting method shown in FIG. It is gripped by wedge-shaped strain clamps 31 on both sides of the armrest 3, and the edging wire (jumper portion) is supported by the support insulator 5 on the upper portion of the armrest 3. The wedge-shaped retention clamp 31 is connected to the armrest 3 of the electric pole via the insulators 7 and 8 and the connecting metal fitting 10. Reference numeral 8a denotes an insulator metal part (metal cap of the insulator 8).

As described above, the wedge-shaped strain clamp 31 of the clamp body side connection type is intended to make an edging wire that bypasses the support and the insulator.
The wire angle θ is set to 40 in order to easily make the edging wire, for example, in order to separate the wire 7 from the insulators 7 and 8 and the connecting metal fitting 10 or to facilitate the work of attaching the wire 2 to the support insulator 5. It was as large as ° -50 °.

[0007]

In the wedge type detention clamp 31 of the clamp body side connection type, since the wire angle θ is large, a large stress is generated in the vicinity of the clamp mouth of the wire 2 due to the wire bending, and therefore the wire breakage occurs. There was a problem that the load value decreased. In addition, there is a problem that the twist of the electric wire is loosened in the bent portion near the clamp mouth of the electric wire 2, so-called laughter is likely to occur. Even if the wire angle θ is to be reduced, the structure in which the clamp body 32 side is connected to the insulator 7 cannot secure a space for driving the wedge 33, and the wire angle θ needs to be about 40 ° to 50 °. It was

The present invention has been made in view of the above circumstances, and provides a wedge-type retracting clamp in which a large stress is not generated in the vicinity of the clamp mouth of a grasped wire and there is no fear of laughing in the wire of the wire. The purpose is to do.

[0009]

SUMMARY OF THE INVENTION According to the present invention for solving the above problems, a wedge connected to a support through an insulator and an electric wire is gripped between the wedge and the wedge fitted from the insulator side. In the wedge type detention clamp consisting of the clamp body, the electric wire insertion direction of the wedge type detention clamp is a.
Is angled with respect to the wire retaining direction b.

A second aspect of the present invention is characterized in that the electric wire angle θ formed by the electric wire inserting direction a and the electric wire retaining direction b in the wedge type detention clamp of the first aspect is set in a range of 10 ° to 40 °.

According to a third aspect of the present invention, there is provided an electric wire retaining structure for retaining an electric wire on a support using the wedge-shaped retaining clamp according to the first aspect. Wire angle θ is 10 ° to 40 °
It is characterized in that it is set within the range of.

[0012]

FIG. 1 is an overall side view showing a state in which an electric wire 2 is fastened to a utility pole arm 3 with a wedge-shaped detention clamp 1 according to an embodiment of the present invention. FIG. 2 shows only a right side portion of FIG. The enlarged view shown in FIG. 3, FIG. 3 is a further enlarged view in the vicinity of the wedge-shaped detention clamp of FIG. 2, and FIG. The insulated wire itself is also indicated by the same reference numeral 2 as the wire conductor. In these figures, the electric wire 2 is gripped by the wedge-shaped detention clamps 1 on both sides of the arm pole 3 of the utility pole, and the bezel (jumper part) is supported by the support insulator 5 on the upper part of the arm bar 3. The wedge-shaped strain clamp 1 is made up of insulators 7, 8,
It is connected to the armrest 3 of the electric pole via the connecting fitting 10.
Reference numeral 8a denotes an insulator metal part (metal cap of the insulator 8).
The wedge-shaped retracting clamp 1 is a wedge-side connecting system, and the wedge 11 connected to the insulator 7 and the wedge 11 are connected to each other.
The electric wire 2 fitted between the insulator 7 and the wedge 11
And a clamp body 12 for gripping.

As shown in FIG. 4, the clamp body 12 is
It has a partially open hollow shape with an opening between the left and right inward extending portions 12a, and has an electric wire housing groove 12b in the upper portion. The wedge 11 fitted in the clamp body 12 has an electric wire accommodation groove 11a for accommodating the electric wire 2 on the upper surface side and a projecting guide portion 11b on the lower surface side, and the clamp body is provided on both sides of the guide portion 11b. 12 has a sliding surface 11c that contacts the inner surface (sliding surface 12c) of the inwardly extending portion 12a. Further, a protrusion 12d for hitting the clamp body 12 is provided at an end portion of the clamp body 12 on the electric wire inlet side as described later.
A serration (not shown) is formed on the surface of the electric wire housing groove 12b of the clamp body 12 to prevent slippage between the electric wire 2 and the clamp body 1.
2 is integrated with the electric wire 2, and only the wedge 11 slides on the clamp body 12 and the electric wire 2 so that the wedge action is ensured.

According to the present invention, the wire angle .theta. That is, the longitudinal direction of the wire housing groove 11a of the wedge 11 is angled with respect to the wire retaining direction (arrow b), and therefore the wire insertion direction (arrow a) of the wedge-shaped detention clamp 1 is the wire retaining direction. It has an angle (electric wire angle θ) with respect to the direction (arrow b).

In the present invention, not the clamp body 12 but the
Since the structure is such that the wedge 11 side is connected to the insulator 7, even if the wire angle θ is smaller than the wire angle θ (40 ° to 50 °) of the wedge-shaped strain clamp 31 of the conventional clamp body side connection method, The electric wire angle .theta. Can be reduced to 40.degree. Or less without any problem such as not being able to secure a space for driving the wedge. Therefore, the bending of the electric wire 2 in the vicinity of the clamp mouth is slight, and a large stress is not generated. Therefore, there is no problem that the wire breakage load value decreases due to stress. In addition, the problem of causing so-called laughter in which the twist of the electric wire is loosened at the bent portion at the clamp mouth of the electric wire 2 is solved.

By the way, as described above, in order to reduce the bending stress generated in the vicinity of the clamp opening of the electric wire 2, it is desirable to make the bending gentle, that is, to decrease the electric wire angle θ. However, as a result of the experiment, the insulator 8 on the side of the arm 3
The distance A (see FIG. 2) between the metal part 8a of the and the electric wire 2 is 190
It was found that if the thickness is less than mm, the wire may be broken due to flashover at the time of lightning. Therefore, it is necessary to secure a distance A of 190 mm or more between the metal fitting portion 8a of the insulator 8 and the electric wire 2. Also, since the electric wire 2 is flexible, it is possible to artificially set (bend) the electric wire 2 to some extent after exiting from the wedge-shaped detention clamp 1, but if the electric wire angle θ is too small. Even if the edging wire is made as shown in FIG. 1, the electric wire (the edging wire) may come into contact with the insulator 7 due to the flexibility of the electric wire, the expansion and contraction due to temperature, etc., which is not preferable. As a result of various studies on the flexibility and other conditions of the electric wire 2, in order to cross the insulator 7, the electric wire angle θ
Was found to be required to be 10 ° or more.

From the above, the wedge-shaped strain clamp 1
It is appropriate that the wire angle θ of 10 ° to 40 °. However,
It is not excluded to set the wire angle θ outside the range. Further, the shapes of the wedge and the clamp body are not limited to those in the embodiment, and the design can be changed as appropriate.

[0018]

According to the present invention, in the wedge-type detention clamp of the wedge side connection system, the wire insertion direction a is angled with respect to the wire retention direction b, that is, the wedge-shaped detention clamp wedge side. Even though it is a wedge-type detention clamp with a connection method, it has a wire angle θ, so it is possible to reduce the wire angle θ to, for example, 40 ° or less, thereby reducing bending stress near the clamp mouth of the wire. It is possible to prevent the electric wire breaking load value from decreasing. Further, it is possible to prevent so-called laughter from occurring in the wire of the electric wire.

Regarding the problem associated with the small wire angle θ, by setting the wire angle θ to 10 ° or more, disconnection due to flashover at the time of lightning can be prevented, and the wire and the insulator can be prevented. It was possible to avoid contact.

[Brief description of drawings]

FIG. 1 is an overall side view of an electric wire retaining structure in which an electric wire is retained on a utility pole arm by a wedge-type retaining clamp according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the right half of FIG.

FIG. 3 is an enlarged view of the vicinity of the wedge-shaped strain clamp of FIG.

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

FIG. 5 is a side view showing a wedge-shaped towing clamp of a conventional wedge-side coupling system.

FIG. 6 is a side view showing a conventional wedge-shaped tow clamp of the clamp body side connection type.

7 is an overall side view of an electric wire retaining structure in which an electric wire is retained on a utility pole arm by the wedge type retaining clamp of FIG.

[Explanation of symbols]

1 wedge type detention clamp 2 electric wires 3 Arms (of support) 5 Support insulator 7, 8 insulator 8a Insulator metal part (insulator cap) 10 Retaining bracket 11 wedges 11a Wire receiving groove 12 Clamp body 12b Wire receiving groove a Wire insertion direction b Wire retention direction

Claims (3)

[Claims] 1. A wedge-shaped retention clamp comprising a wedge connected to a support through an insulator, and a clamp body that is fitted to the wedge from the insulator side and holds an electric wire between the wedge and the wedge. A wedge-shaped detention clamp, wherein the wire insertion direction a of the wedge-shaped detention clamp has an angle θ with respect to the wire retention direction b. 2. The wire insertion direction a and the wire retaining direction b
2. The wedge-shaped detention clamp according to claim 1, wherein an electric wire angle θ formed by and is set in a range of 10 ° to 40 °. 3. An electric wire retaining structure for retaining an electric wire on a support by using the wedge-shaped detention clamp according to claim 1, wherein an electric wire angle formed by an electric wire insertion direction a and an electric wire retention direction b of the wedge-shaped detention clamp. An electric wire holding structure in which θ is set within a range of 10 ° to 40 °.