JP2007267475A - Overhead ground wire mounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overhead ground wire mounting device that makes it possible to perform a work of changing a ground wire suspension device into a ground wire withstand-tension device on a pylon very easily. <P>SOLUTION: This device is provided with a base plate 6 mounted on the top 1 of the pylon, a pair of withstand-tension clamp 16 for pulling and holding aerial ground wires 17, and a jumper clamp 11 for mounting a jumper wire 18. In the base plate 6, a base plate side bolt hole (a first bolt hole) 61 for mounting the base plate 6 on the top plate 1a of the top 1 of the pylon is provided using an existing top bolt hole 2 provided on the top 1 of the pylon. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an aerial ground wire mounting device for fixing an aerial ground wire to the top of a steel tower.

  The overhead ground wire stretched on the power transmission tower needs to be replaced after a predetermined period of time, depending on lightning strikes and rusting conditions. When repositioning an overhead ground wire, if the place where the overhead ground wire is attached by the ground suspension system is used as a reshuffling boundary or an interruption location, the ground suspension system cannot hold the overhead ground wire with a constant tension. Therefore, it is necessary to replace it with a ground wire tension device.

  As shown in FIGS. 4 (a), (b), and (c), the conventional ground wire suspending device includes four sets of bolts 21 and nuts (double nuts) 22, and linear grooves 24 of the clamp body 23 and the pressing piece 25, In this structure, the overhead ground wire 27 is sandwiched between the bolts 26 and the bolts 21 and the nuts 22 are tightened to fix the overhead ground wire 27 to the suspension clamp K.

  Here, the top plate 1a of the tower top 1 is provided with four existing top bolt holes 2 for passing four bolts 21 from the lower surface side. The clamp body 23 and the pressing piece 25 of the clamp K are provided with bolt holes 23 a and 25 a that are coaxial with the top bolt holes 2, respectively. Therefore, the ground wire suspension device has a structure in which the overhead ground wire 27 is bolted to the top plate 1a using the clamp K.

  On the other hand, as shown in FIG. 5 and FIG. 6, the ground wire tension device has four bolt holes 31 for attaching to the top plate 1 a of the tower top 1 on the elliptical substrate 37 and includes the overhead ground wires 43, 43. Two bolt holes 42 are provided for attaching tension clamps 41, 41 that are tensioned with a constant tension. Further, two bolt holes 32 for attaching the jumper clamp 40 are provided at the center of the substrate 37.

  Then, the ground wire tension device is fixed to the top plate 1a and the jumper wire 44 is fixed to the substrate 37 by fastening the jumper clamp 40 with two sets of bolts 34 and nuts 36 passed through the bolt holes 40a. The The tension clamps 41 and 41 are respectively attached to the substrate 37 via two U clevises (shackles) 4a and a single link 4b using the bolt holes 42 of the substrate 37.

  That is, since the ground wire suspension device does not have a bolt hole for attaching the tension clamp 41, the overhead ground wire 43 cannot be retained with a constant tension, and when it becomes a tension change boundary or an interrupting location, the tension clamp Therefore, it is necessary to replace the ground wire tension device 41 with the bolts 31a and 32a in the top plate 1a with a drill so as to fit the bolt holes 31 and 32 of the substrate 37.

  However, the work of drilling the bolt holes 31a and 32a with the drill at the tower top 1 is a work in a place where the tower is shaken by the wind or the scaffold is not stable, so the workability is poor, and in some cases the tower top The bolt holes 31a, 32a newly drilled and the bolt holes 31, 32 of the ground wire tension device (substrate 37) do not match, so that the bolt holes 31, 32 of the tower top 1 or the tension device are drilled. It was necessary to fix it or to make a tension device again.

  Therefore, this invention makes it a subject to provide the technique of the overhead ground wire attachment apparatus which can perform the ground wire tension | tensile_strength apparatus work from a ground wire suspension apparatus very easily on a steel tower.

In order to solve the above-mentioned problems, the present invention employs the following means.
The present invention is an aerial ground wire mounting apparatus comprising a substrate attached to the top of a steel tower, a tension clamp for retaining the overhead ground wire, and a jumper clamp for attaching a jumper wire. By using an existing top bolt hole provided at the top, a first bolt hole for attaching the substrate to the top of the steel tower is provided.

  According to the present invention, since the first bolt hole for attaching the substrate to the tower top is provided on the tower using the existing top bolt hole provided in the tower top, the tower top Then, it is only necessary to replace the bolts, and the work of newly drilling or reopening the existing bolt holes on the steel tower can be eliminated. As a result, the work for forming the ground wire tension device from the ground wire suspension device can be performed very easily on the steel tower.

  In the present invention, the substrate has a main body portion in which a first bolt hole is formed and an overhang portion protruding from the main body portion, and a jumper clamp is attached to the overhang portion. desirable. In this way, when the board itself is provided with an overhanging part and a jumper clamp is attached thereto, it is necessary to consider that the place where the jumper clamp is attached and the place where the board is bolted to the top of the steel tower do not interfere with each other. it can. Thereby, any of the operation | work which attaches a board | substrate to a steel tower top, the operation | work which attaches a jumper clamp to a board | substrate, and the operation | work which attaches a jumper wire to a jumper clamp can be performed smoothly and easily.

  In the present invention, the main body portion of the substrate is provided with a second bolt hole for attaching a tension clamp, and the overhang portion is provided with a third bolt hole for attaching a jumper clamp. It is desirable to have a configuration. Thus, by providing the 2nd bolt hole and the 3rd bolt hole with respect to a board | substrate, the operation | work which attaches a tension | tensile_strength clamp and a jumper clamp to a board | substrate can be performed easily on a steel tower. Of course, the tension clamp or the jumper clamp may be previously attached to the substrate on the ground. Then, the bolting operation on the steel tower can be further simplified.

  According to the overhead ground wire mounting device according to the present invention, the overhead ground wire mounting device can be attached to the tower top using the existing top bolt hole provided at the tower top, so the bolt at the tower top Since the hole drilling work becomes unnecessary, the work can be simplified and the working time can be shortened.

  Preferred embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, components that are basically the same as those in FIGS. 4 to 6 shown in the conventional example are denoted by the same reference numerals.

  FIG. 1 is a schematic perspective view of an aerial ground wire mounting device according to an embodiment of the present invention. 2 is a partially omitted plan view and a sectional view of FIG. 3A is a plan view of the top of the steel tower, FIG. 3B is a plan view of the substrate, and FIG. 3C is a plan view of the state where the substrate is placed on the top of the steel tower.

As shown in these drawings, the aerial ground wire mounting apparatus of this embodiment attaches a substrate 6 attached to the tower top 1, a pair of tension clamps 16 for holding the aerial ground wire 17, and a jumper wire 18. The jumper clamp 11 is provided. And the board | substrate 6 bolt hole (1st bolt hole) for attaching this board | substrate 6 to the top plate 1a of the tower top 1 using the existing top bolt hole 2 provided in the tower top 1 in the board | substrate 6 is used. ) 61 is provided.

  As shown in FIG. 4, the existing top bolt hole 2 is a bolt hole provided to bolt the suspension clamp K of the existing ground wire suspension device to the top plate 1a, as shown in FIG. Four are provided in a form located at the four corners of the planar rectangle smaller than the planar rectangular top plate 1a. Accordingly, four first bolt holes 61 of the substrate 6 are also provided in the four top bolt holes 2 in a form corresponding to the same axis. Thereby, the board | substrate 6 can be simply attached with respect to the top plate 1a with four sets of volt | bolts 3a and nuts 3b, as shown in FIG.

  As shown in FIG. 3, the substrate 6 has a main body portion 6a in which a first bolt hole 61 is formed, and an overhang portion 6b protruding from the main body portion 6a, and a jumper is provided on the overhang portion 6b. A clamp 11 is attached. The jumper clamp 11 has a clamp main body 11a and a pressing piece 11b, and has an existing structure in which the jumper wire 18 is fixed to the substrate 6 by sandwiching the jumper wire 18 therebetween and tightening the bolt 5a and the nut 5b.

  As described above, the overhanging portion 6b is provided on the substrate 6 itself, and the jumper clamp 11 is attached to the overhanging portion 6b. It is something that is not considered. Thereby, all of the operation | work which attaches the board | substrate 6 to the steel tower top 1, the operation | work which attaches the jumper clamp 11 to the board | substrate 6, and the operation | work which attaches the jumper wire 18 to the jumper clamp 11 can be performed smoothly and easily.

  A second bolt hole 62 for attaching the pair of tension clamps 16, 16 disposed relative to each other on the main body portion 6 a of the substrate 6 is 1 on each end side opposed to the length of the overhead ground wire 18. There are two in total. Furthermore, two third bolt holes 63 for attaching the jumper clamp 11 are provided in the overhanging portion 6b at an interval.

  Each tension clamp 16 is attached to the substrate 6 through two U clevises (shackles) 4a and a single link 4b using the second bolt holes 62 of the substrate 6. The jumper clamp 11 is attached to the overhanging portion 6b by two sets of bolts 5a and nuts 5b using the third bolt holes 63 and 63.

  Thus, by providing the second bolt hole 62 and the third bolt hole 63 on the substrate, the work of attaching the tension clamp 16 and the jumper clamp 11 to the substrate 6 can be easily performed on the steel tower. be able to. The bolt clamp work on the steel tower can be further simplified by attaching the tension clamp 16 and the jumper clamp 11 to the substrate 6 in advance on the ground.

  According to this embodiment, the first bolt hole 61 for attaching the substrate 6 to the tower top 1 is provided on the board 6 by using the existing top bolt hole 2 provided in the tower top 1. Therefore, the steel tower top 1 can be attached only by replacing bolts using the bolts 3a and nuts 3b. Accordingly, it is possible to eliminate the need for new drilling or reopening of bolt holes for attaching the substrate 6 and the jumper clamp 11 at the tower top 1. As a result, the work for forming the ground wire tension device from the ground wire suspension device can be performed very easily on the steel tower.

It is a schematic perspective view of the aerial ground wire mounting device according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The overhead ground wire attachment apparatus which concerns on the Example of this invention is shown, (a) is a partially abbreviated top view, (b) is the sectional view on the AA line of (a). BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an overhead ground wire mounting device according to an embodiment of the present invention, in which (a) is a plan view of a steel tower top, (b) is a plan view of the board, and (c) is a state where the board is placed on the top of the steel tower. FIG. The conventional ground wire suspension apparatus is shown, (a) is a top view, (b) is a side view, (c) is BB sectional drawing of (a). It is a schematic plan view which shows the conventional ground wire tension apparatus. It is a schematic side view which shows the conventional ground wire tension apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel tower top part 1a Top plate 2 Existing top bolt hole 3a, 5a Bolt 3b 5b Nut 6 Board | substrate 61 1st bolt hole 62 2nd bolt hole 63 3rd bolt hole 11 Jumper clamp 11a Clamp main body 11b Pressing piece 16 Tensile clamp 17 Aerial Ground wire 18 Jumper wire

Claims (3)

An aerial ground wire mounting device comprising a substrate attached to the top of a steel tower, a tension clamp for retaining an aerial ground wire, and a jumper clamp for attaching a jumper wire,
An overhead ground wire mounting device, wherein the board is provided with a first bolt hole for mounting the board to the top of the steel tower using an existing top bolt hole provided at the top of the steel tower. .   The substrate has a main body portion in which the first bolt hole is formed, and an overhang portion protruding from the main body portion, and the jumper clamp is attached to the overhang portion. The aerial ground wire mounting device according to claim 1.   A second bolt hole for attaching the tension clamp is provided in the main body portion of the substrate, and a third bolt hole for attaching the jumper clamp is provided in the overhang portion. The aerial ground wire mounting device according to claim 2.

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