JPH0998527A - Jumper clamp for earth wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a part of a jumper wire gripped by a pair of gripping pieces as short as possible by applying to the gripped part of the jumper wire a collar divided into two parts along the spiral of a fin with the fin put between the two divided parts of the collar. SOLUTION: A jumper wire is gripped between a pair of gripping pieces through a collar 4a, 4b which are divided into two parts in the longitudinal direction corresponding to the spiral of a spiral fin 2a, 2b. In other words, the collar parts 4a, 4b are so put on a jumper wire 2a that they may hold the wire between them with the fin 2b lying in the middle and then the wire provided with the collar 4a, 4b is held between a pair of the gripping pieces and is tightened with bolts and nuts. By this method, the collar 4a, 4b can be easily put on the jumper wire 2a and at the same time, the collar 4a, 4b can be perfectly fit in with the fin 2a. Furthermore, a length of the gripped part of the jumper wire 2a can be shortened and thereby a curvature of the jumper wire 2a can be effectively met.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground wire jumper clamp, and more particularly to a ground wire jumper clamp having fins around a ground wire for preventing wind noise of a spiral line.

[0002]

2. Description of the Related Art Conventionally, a transmission line tower (hereinafter referred to as a tower)
When fixing the jumper wire portions of the ground wire, which are respectively supported by the tension clamps, to the top of the steel tower on both sides of the above, the ground wire jumper clamp provided at the top of the steel tower is used.

This conventional ground wire jumper clamp is carried out by holding a part of the jumper wire between a pair of holding pieces, and the holding piece located below these holding pieces is attached to the top of the tower through a pedestal. It is installed. Then, a part of the jumper wire is placed on the lower holding piece, the other holding piece is placed, and then the two holding pieces are tightened with bolts and nuts. By tightening the bolts and nuts, a predetermined gripping force, for example, a gripping force of 700 kgf or more is applied to the jumper wire, whereby the jumper wire is fixed to the top of the steel tower.

By the way, when a spiral convex fin is provided around the ground wire to prevent wind noise, the jumper wire is evenly grasped by the pair of gripping pieces and the gripping portion of the jumper wire is not damaged. Therefore, a collar made of a material such as an aluminum alloy is attached to the sandwiched portion of the jumper wire. In particular, a so-called optical fiber composite overhead ground wire (hereinafter, having an optical fiber for communication inside the ground wire (hereinafter,
(Referred to as OPGW), the role of color is particularly effective for the reasons described above.

The collar has a length substantially equal to the length of the portion where the jumper wire is held by the pair of holding pieces, and is formed in two in the length direction. Therefore, the collar can be attached to the jumper wire by sandwiching the sandwiched portion of the jumper wire from the both sides with the divided color and winding the adhesive tape from above.

[0006]

However, in the conventional ground wire jumper clamp described above, when the collar is attached to the ground wire with fins and is held, the fins are stored in the spiral groove provided in the collar. There was a drawback that it was difficult to confirm whether or not it was done from the outside.

The jumper wire supported by the ground wire jumper clamp has a curvature for connecting the loosened portions of the ground wire supported by the pair of tension clamps. On the other hand, the part held by the pair of holding pieces has a straight shape, so that the vicinity of the straight line swells and it is difficult to fit in the groove of the pair of holding pieces, and the collar is not attached to the jumper wire. There was a drawback called lei. Therefore, the emergence of a ground wire jumper clamp that can shorten the length of a straight line held by a pair of holding pieces as much as possible has been awaited.

Therefore, the present invention has been made to solve the above-mentioned drawbacks, and its purpose is to shorten the length of the portion that holds the jumper wire, and to easily and easily attach the collar to the jumper wire. It is to provide a ground wire jumper clamp that can be reliably mounted.

[0009]

In order to achieve the above object, the ground wire jumper clamp according to the present invention is provided with a jumper wire portion of the ground wire having a spiral fin around the top of a steel tower. In a ground wire jumper clamp that is held by a pair of holding pieces, a pair of half-split collars corresponding to the fin spiral are divided into two parts in the jumper wire that is held by the pair of holding pieces. It is characterized by interposing the fins in the middle. Further, in order to achieve the above object, the ground wire jumper clamp according to the present invention holds a jumper wire portion of a ground wire having a spiral fin around it with a pair of gripping pieces provided at the top of a steel tower. In the ground wire jumper clamp, notches that are cut out larger than the thickness of the ground wire are respectively provided at both end portions of the pair of holding pieces that hold the jumper wire. Further, a pair of half-split collars corresponding to the spiral of the fin are interposed in the part of the jumper wire held by the pair of holding pieces with the fin in the middle. There is.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a top portion of a steel tower T when the ground wire jumper clamp 1 of the present invention is applied.

A tension clamp C is provided on both sides of the top of the steel tower T.
Opposite two fins OPGW2 shown in FIG. 3 to be described later are respectively stretched via 1 and C2, and a jumper wire 2a is formed by the OPGW2 between the tension resistant clamps C1 and C2. A part of the jumper wire 2a is fixed to the top of the steel tower T via the ground wire jumper clamp 1.

The jumper clamp 1 includes a pair of holding pieces 3.
a, 3b, and between the holding pieces 3a, 3b, as shown in an exploded perspective view in FIG. 2, spiral fins 2b, 2b.
4a, which is divided into two in the longitudinal direction corresponding to the spiral of
It is configured to be sandwiched with 4b interposed. That is, these collars 4a, 4b are attached so that the fins 2b are sandwiched between the jumper wires 2a from both sides, and the collars 4a, 4b are placed between the pair of holding pieces 3a, 3b. Bolt and nut B,
It is configured to be tightened and gripped with B ...

The lengths of the collars 4a, 4b in the longitudinal direction are determined to be the same as the lengths of the grooves provided in the pair of holding pieces 3a, 3b shown in FIG. Collar portions 41a and 41b located at positions apart from the groove are provided on both end sides, respectively.

In FIG. 3, the jumper wire 2a has collars 4a, 4
The front view of a state in which b is mounted and held by the pair of holding pieces 3a and 3b, FIG. 4 is a left side view of FIG. 3, FIG. 5 is a plan view of FIG. 3, and the left half of the upper holding piece 3a is cut off. It shows the state of being done.

The pair of holding pieces 3a and 3b are used for the tower T
It is configured to be attached via a pedestal 5 attached to the top of the. That is, this pedestal 5 includes the holding piece 3
a, 3b are placed, and these holding pieces 3a, 3b
Has an upper piece 5a integrally fixed thereto by bolts and nuts B, B ..., a vertical piece 5b extending vertically downward from a lower surface of the upper piece 5, and a vertical piece 5b provided on the upper surface, It is composed of a mounting piece 5c mounted on the top of the steel tower T by nuts B, B ... (See FIG. 1).

As shown in FIG. 3, a pair of holding pieces 3a.
Grooves 3a 'and 3b' into which the upper and lower halves of the collars 4a and 4b can be inserted are respectively provided on the joint surfaces of 3 and 3b. On both ends of these grooves 3a ', 3b', there are provided notches (so-called steals) 31a, 31b that are open in a trumpet shape in the outward direction, which is sufficiently larger than the diameter (thickness) of the jumper wire 2a. The length for actually holding the jumper wire 2a is configured to be as short as possible. Therefore, it is possible to sufficiently deal with the curvature of the jumper wire 2a.

Next, a procedure for attaching the jumper wire 2a to the ground wire jumper clamp 1 will be described. First, the gantry 5 is attached to a predetermined position on the top of the steel tower T by the bolts / nuts B, B ... And the lower holding piece 3b is placed on the upper piece 5a of the pedestal 5 to which the pedestal 5 is attached.

Next, the collars 4a and 4b are attached to predetermined fixing (holding) portions of the jumper wire 2a. That is,
The pair of collars 4a and 4b are the fins 2 of the jumper wire 2a.
The collars 4a and 4b are fixed with adhesive tapes after they are mounted so as to be sandwiched from both sides with b and 2b in the middle. Therefore, the collars 4a and 4b are the jumper wires 2a.
It will be temporarily stopped at.

The jumper wire 2a to which the collars 4a and 4b are attached is inserted into the groove 3b 'of the lower holding piece 3b.
This insertion is guided by the collar portions 41a and 41b of the collars 4a and 4b to be accurately positioned at a predetermined position of the groove 3b '. Then, in this state, the upper holding piece 3a is placed, and the upper piece 5a of the gantry 5 and both holding pieces 3a, 3b are tightened by the bolts / nuts B, B ...

By tightening the bolts / nuts B, B ...
A predetermined gripping force is applied to the jumper wire 2a via the pair of holding pieces 3a and 3b, whereby the jumper wire 2a is fixed to the top of the steel tower T. In addition, bolts and nuts B,
As shown in FIG. 5, B ... are configured to be inserted into the concentric elongated holes provided in the upper piece 5a of the gantry 5 and the pair of holding pieces 3a, 3b. Therefore, the mounting angle can be adjusted according to the direction of the jumper wire 2a.

In the above structure, the collars 4a and 4b are
The pair of holding pieces 3a, 3b can be shortened as much as the notches 31a, 31b are provided, so that the actual holding length can be shortened. Further, since the fins 2b and 2b provided around the jumper wire 2a are sandwiched in between, the positional relationship between the collars 4a and 4b and the fins 2b and 2b can be surely matched. Further, the collars 4a and 4b have collar portions 42a and
Since 42b is provided, it can be used for guiding and positioning when inserting into the groove shapes 3a ', 3b' provided in the holding pieces 3a, 3b.

6 and 7 show a ground wire jumper clamp 1'according to another embodiment of the present invention.
6 is a front view thereof, and FIG. 7 is a left side view of FIG.

The ground wire jumper clamp 1'shown here is used when two jumper wires 2a ', 2a "are crossed in a cross shape when viewed in plan and fixed to the top of the steel tower T. For example, it is used when the steel tower T has a connection box (not shown) for optical fibers.

Therefore, the ground wire jumper clamp 1'shown here is further provided with a pair of holding pieces 13 on top of the ground wire jumper clamp 1 shown in FIGS.
It has a structure in which a and 13b are laminated.

[0025]

The jumper clamp for ground wire according to the present invention has a pair of half-split collars, which are divided into two corresponding to the spiral of the fin, at the portion of the jumper wire held by the pair of holding pieces. Since the fins are interposed in the middle, it is easy to attach the collar to the jumper wire, and moreover, the positional relationship between the fins and the collar can be accurately and surely matched. Since the ground wire jumper clamp according to the present invention is provided with the notched portions, which are notched larger than the thickness of the ground wire, at both end portions of the pair of holding pieces for holding the jumper wire, the jumper wire is actually held. The length of the jumper wire can be shortened, and the curvature of the jumper wire can be effectively dealt with.

[Brief description of drawings]

FIG. 1 is a schematic view of a tower top portion when a ground wire jumper clamp according to the present invention is applied.

FIG. 2 is an exploded perspective view showing a relationship between a collar and a jumper wire.

FIG. 3 is a front view showing a cross section of the left half of the ground wire jumper clamp with the jumper wire being gripped.

FIG. 4 is a left side view of FIG.

FIG. 5 is a plan view of FIG. 3;

FIG. 6 is a front view of a ground wire jumper clamp according to another embodiment of the present invention.

FIG. 7 is a left side view of FIG.

[Explanation of symbols]

 1,1 'Ground wire jumper clamp 2 Ground wire (OPGW) 2a, 2', 2 "Jumper wire 2b Fins 3a, 3b, 13a, 13b Holding pieces 3a ', 3b' Grooves 31a, 31b Notches 4a, 4b Collar 42a, 42b Collar T Transmission line tower (steel tower) C1, C2 tension clamp

Claims (3)

[Claims] 1. A ground wire jumper clamp for holding a jumper wire portion of a ground wire having spiral fins on its periphery with a pair of holding pieces provided at the top of a transmission line tower, wherein the pair of holding pieces has a pair of holding pieces. A jumper clamp for a ground wire, characterized in that a pair of half-split collars corresponding to the spiral of the fin are interposed between the held jumper wires with the fin in between. 2. A ground wire jumper clamp in which a jumper wire portion of a ground wire having a spiral fin on the periphery is held by a pair of holding pieces provided at the top of a transmission line tower, and the jumper wire is held. The ground wire jumper clamp is characterized in that cutout portions that are cut out larger than the thickness of the ground wire are provided at both side ends of the pair of holding pieces. 3. A pair of half-split collars corresponding to the spiral of the fin are interposed in the portion of the jumper wire held by the pair of holding pieces with the fin in the middle. The ground wire jumper clamp according to claim 2.