JPS63209416A - Replacement of overhead grounding line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention mainly relates to a method for relining overhead power distribution ground lines.

(Prior Art and Problems) Conventionally, when replacing an overhead power distribution ground line, a power outage is performed on the lower distribution line, and during that time, the old ground line is removed and a new ground line is extended. However, in recent years, due to changes in the social situation during re-upholstery work, especially in urban areas, due to concerns such as the use of computers, it is not recommended to perform power outage work even for a moment, and even in the event of an uninterrupted power outage. It is required to perform work. Therefore, as an easy construction method, each utility pole support point of the joint line to be replaced was replaced with a metal wheel, a new ground wire was connected to the terminal of the joint line, and the wire was rolled up from the other end. In order to prevent the ground wire from hanging down and coming into contact with the live wire located below, the wire is wound up while applying a suitable pack tension, which may cause damage to the joint line or breakage due to deterioration. Ta. Furthermore, if there is a curve in the construction span, a higher tension is required and the risk of cutting becomes higher.

(Means for solving the problem) Therefore, in the present invention, without applying high tension to the joint line, it is possible to eliminate the sagging of the joint line both when extending a new line and when removing the joint line, and to avoid contact with live wires. In order to eliminate accidents, a predetermined number of carriers will be deployed in the construction span, and new and old ground lines will be pulled out and extended within the carriers to prevent the lines from sagging when the extended lines are removed.

(Example) The construction method of the present invention involves attaching metal wheels to each utility pole in the planned span of the line.
A traction rope K is stretched parallel to the lower position near the joint line. The -mth device group is connected to the traction rope at its end via a yoke or the like.

As shown in Fig. 2.3, the m unit B has the fixed frame 1 on the negative side.
An upper roller 3 and a lower roller 4 made of resin are respectively pivotally attached to the upper and lower ends of the frame, and a fixed shaft 5 is provided in the middle between the two, and a bearing hole 21 of the open frame 2 passes through the tip of the fixed shaft 5. The open frame 2 receives the shafts of the upper and lower rollers 3.4.
It has a wire insertion part 6 that can be opened upward and downward by a tightening nut 51 screwed onto the fixed shaft 5 from the outside. Furthermore, the fixed shaft 5 covers the spacer 52 which has a diagonal cross section, and therefore has a substantially triangular shape (Gt) formed between the upper and lower rollers 3 and 4 and the spacer 52. . Further, a connecting ring 53 is provided to protrude from the spacer 52 to both sides. The first carrier group B1 opens the open frames 2 of a predetermined number of the carriers B, and the upper roller 3
is mounted on the joint line, the main rope W is supported on the lower roller 4, and connected to each connecting ring 53 by a fixed length of connecting rope R having hooks at both ends. It is connected to the first carrier B by a connecting rope R, and the main rope W on the lower roller 4 is pulled out from the first carrier and connected to the cork. This group of carriers is mounted on the joint line by a worker who has climbed onto the utility pole at the end of the first span of the line extension.

After the first carrier group B1 has been mounted on the joint line, the tow rope K is wound up from the other end, so that the carrier group B1 moves and the first carrier goes to the next utility pole. The waiting worker removes the connecting rope R from the yoke and fixes it to the utility pole, and fixes the connecting rope R at the short end to the utility pole in the same way.

The main rope W goes out to the next span while being connected to the towing rope K, and in this second span, the second carriage group B2 is similarly hit at the joint line, and the main rope W is held on the lower roller 4. The carrier group B2 is deployed by winding it around the tow rope.

Work is carried out in the same manner on each span, and when the deployment of the carrier group, that is, the extension of the main rope W, is completed over all the spans scheduled for re-spanning, the main rope W attachment point of each utility pole is moved from the support point of the joint line G. By moving it to a high position and increasing the tension of the main rope W on the ground, the vertical position of both lines C9W is changed.

At this time, each carrier B is reversed, but the triangular shape of the fixed @5 spacer 52 determines the direction in which the tensioned main rope W slides up within the wire insertion part 6, and each carrier B is , it is possible to prevent the main rope W from twisting due to rotation in the same direction.

By suspending the main rope W at the upper position by the lower roller 4, releasing the tension at the joint line G between the extension spans, connecting the new ground wire to its end, and winding it toward the other end. At the time when the upper roller 3 of the carrier B was pulled out and the Shinchi Line NG was extended, each company tightened the Shinchi Line NG and moved each forward support point of the main rope W to the lower position. Then, the construction is completed by reversing each carrier B and re-suspending each carrier group from the Shinchi Line NG by the upper roller 3 to each span by winding the connecting rope R. . Also, the main rope W is pulled out on the lower roller 4 of the group of carriers before collection, or is removed from the group of carriers for each span during collection and falls to the ground once! ! It is something to do.

(Effects of the Invention) As described above, by using the construction method of the present invention, the carriers arranged at predetermined intervals can prevent joint lines or new ground lines from sagging, thereby preventing accidents caused by contact with live nets, and power outages. The effect is imitated, such as not having to do any work.

[Brief explanation of the drawing]

Figure 1 is a procedure diagram of this construction method, Figure 2 is a front view of the carrier used in this construction method, Figure 3 is a right side view of (, and Figure 4 is an explanatory diagram of the state of use.

Claims (1)

[Claims] A tow rope is extended close to and parallel to the position below the old ground line in the construction span, and one end of the rope is suspended from the old ground line using an upper roller, the main rope is supported on the lower roller, and the connecting rope is used to extend the line at specified intervals. By connecting the first group of carriers connected to the ground line and winding the tow rope at the other end, the first group of carriers is deployed to the first span, and in the next span, the second group of carriers is similarly mounted on the old ground line. Stack,
The main rope transported by the first carrier group is then supported and deployed within the span, and the following carrier groups are similarly deployed in each span to extend the main rope over the entire length of the construction span, and After relocating the main rope support point to a higher place than the old ground line support point,
Increase the tension on the main rope, switch the vertical positions of both lines, suspend the main rope with the lower roller of each carrier, release the tension on the old ground line with the old ground line supported by the upper roller in the lower position, Cut it and connect the new ground wire to one end, pull it out from the other end, remove the old ground wire and extend the new ground wire connected to it, and after tensioning the new ground wire, loosen the tension on the main rope. A method of relining overhead lines that swaps the vertical positions of both lines, moves each group of carriers suspended from the Shinchi Line, and removes them for each span.