JPS6268010A - Protecting method for lower structure in transmission line installing work - 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 The present invention is a method for connecting overhead power transmission lines between adjacent towers. When installing multiple wires across structures, this is a method to prevent abnormal drooping of the wires from contacting the structures below, causing accidents, or damage to the wires due to unforeseen circumstances during overhead wiring work.

Conventionally, methods have been adopted to protect lower structures during overhead line work, such as constructing protective scaffolding on both sides near the structure and erecting wire ropes in the form of a net between them.

However, in recent years, with the increasing size of power transmission line equipment and the diversification of crossing structures, protective scaffolding has tended to be larger and stronger. Installation is also extremely difficult in terms of securing land. In addition, if the lower structure is a special high-voltage power transmission line, it becomes a large-scale protection scaffold and the protection device itself is made of conductive material, so installing the protection device requires a long power outage.
Sufficient countermeasures are also required to avoid accidental contact between the protection device itself and the lower power transmission line.On the other hand, a recent method that does not require the construction of protective scaffolding is to stretch Metsenger wire between adjacent towers for each electric wire to be erected, and The hanging wheel construction method is used, in which wires are suspended from wires using metal wheels. However, when installing multi-conductor wires, the wires must be large in order to withstand the weight, which increases the labor involved in handling the wires. Trouble during overhead line work with metsenger wires and metal wheel devices, such as when the efficiency is reduced or special high-voltage power transmission lines cross, can directly lead to damage to the structures below, and can also reduce the number of electric shock accidents for each overhead line worker. It is also expected to be induced.

The present invention applies to the protection scaffolds or pylons on both sides of the multi-strand electric wire below the lowest level of the multi-strand electric wire, whether the above-mentioned protective scaffolding is constructed or the construction thereof is omitted and the pylons on both sides of the installed power transmission line are used. A protective horizontal arm is provided, and a plurality of electrically insulating bus lobes are maintained at appropriate intervals between them. By providing a plurality of them, the lower structure is protected. As mentioned above, use an inflexible solid body as a protector to prevent vertical contact.
This reduces the risk of contact with the structures below, as there is almost no downward sag compared to when using flexible lobes, thus reducing the risk of contact between overhead power lines and structures below. It is particularly advantageous if the vertical distance between the two busbar lobes is relatively short and the spacing between adjacent busbar lobes is relatively long. In other words, if the above-mentioned protective body is a lobe, there is no tension to pull it laterally, so if the horizontal span is long, not only will it sag downward even in normal times, but it will also sag downward in an unexpected situation. If the t-line hangs abnormally and hits the lobe, there is a risk that it will sag further and come into contact with the structure below, but if an inflexible solid body such as a round bar is used instead of the lobe, this can be avoided. This eliminates disadvantages. Therefore, it also becomes practically possible to use the existing steel towers without constructing special protective scaffolding to protect the structures below.

Furthermore, compared to the conventional construction method in which a metsenger wire is strung for each electric wire as described above, the protection of all the multiple electric wires can be achieved at the same time, making it possible to carry out the overhead line work using a normal and simple construction method. There is no reduction in efficiency of overhead line work due to property protection. In addition, compared to the conventional method of using a steel wire net, the busbar lobes and the protective body that connects them laterally are made of electrically insulating material, which is lighter in weight due to the general properties of this material. , its handling is easy. Furthermore, since insulators generally have softer surfaces than metals, even if an upper wire falls and comes into contact with it, the wire will not be damaged. Furthermore, even if the bus rope etc. were to break and fall, due to its light weight and insulating properties, it would not cause mechanical and electrical damage to the structures below.
Especially if this is an extra-high power transmission line, there will be no power outage accidents or electric shock accidents to people or animals.

In the present invention, in order to make the protector that laterally communicates between the bus ropes movable along the bus ropes, a roller tool having a built-in rolling roller is attached to each bus rope. A plurality of electrically insulating auxiliary lobes are installed along each bus rope between the columnar bodies on both sides, movable in the wire length direction, and attached to the frame of the roller tool at appropriate lengths. The above-mentioned cross-connecting protector can be extended to a desired position along the bus rope, and the protector can then be smoothly recovered into a columnar body during strong winds or other times. I can do it.

To explain one embodiment of the present invention with reference to the drawings, in FIG. Shown as completed. Below the power transmission line 3, there is an electric wire 6 stretched between both utility poles 4 and 5 as the existing lower structure, and this electric wire 6 is perpendicular or diagonal to the power transmission line 3. The protection device according to the present invention is installed between the steel towers A and 8 along the power transmission line 3 so as to be interposed between it and the existing power line 6 below. In other words, this embodiment corresponds to one in which steel towers on both sides are used without constructing protective scaffolding.

Of the three horizontal arms above and below that support the three-phase, three-wire, two-circuit power transmission lines of towers A and B, a protective horizontal arm 9°10, which is slightly longer than the lowest arm 7°8, is installed below the lowermost arm 7°8. ,
Fixedly installed at B. Both horizontal arms 9 and 10 are installed in directions facing each other, and four electrically insulating busbar ropes 11 are stretched in parallel with each other at appropriate intervals between them.

A plurality of electrically insulating hangers 12 connecting these bus ropes laterally are installed at appropriate intervals along the length direction of each bus rope 11, and these ropes 11 and A roller tool 13 is provided at each intersection with the hanging lever 12. A roller built into each roller tool 13 is in a relationship of rolling in contact with each generatrix rope 11, and both ends of the hanging lever 12 are suspended from a frame supporting the roller. Furthermore, an electrically insulating auxiliary rope 14 is provided along each bus rope 11 so as to be movable in the wire length direction, and this rope is latched to the frame of the roller tool 13 at each appropriate length. be done. Although not shown in the drawing, the auxiliary rope 14 has a length that is more than twice the distance between the steel towers A and 3, and one half of the rope is not shown in the drawing. Immediately before the completion of the erection work, both ends of the halves are tightened as shown and fixed to the horizontal arm 9,1°.

FIG. 2 shows details of the hanging heel 12 and its relationship to the adjacent busbar ropes 11.11. The roller tool 13 moves along the busbar rope 11 by rolling a roller built therein in contact with the bus rope 11, and the auxiliary rope 14 is locked to the frame of the roller tool 13. Hanging or 1
2 is the upper and lower two horizontal circles A16.17 and their ends! It is composed of a vertical plate 18 that connects the upper and lower sides and a reinforcing diagonal member 19 that is provided in a zigzag shape between the upper and lower round bars 16 and 17.

Further, the lower ends of the hanging members 20 are supported by the left and right vertical plates 18,
The upper end portion of the roller tool 130 is engaged with a hole of the hanging tool 15 that projects downward from the lower surface of the frame body, and is suspended by the roller tool 130 under pressure. A reinforcing support 21 is attached between the left and right hanging members 20 and the horizontal round bar 16. Most of the above members 16-21 are made of electrically insulating material.

The bus lobe 11 and the auxiliary rope 14 are made of electrically insulating material, and from the viewpoint of the usage of the present invention, it is desirable that they have as high a mechanical tensile strength as possible and have high durability, weather resistance, etc. . An example of a rope that uses a material that satisfies these conditions is a so-called Kevlar rope that uses special high-strength organic fibers. In addition to having sufficient electrical insulation, this wire rope has approximately the same mechanical breaking strength as conventional wire ropes of approximately the same diameter, and weighs less than 1/'3. On the other hand, it is desirable that the hanging basket 12 is made of an electrically insulating material as well as having as high mechanical strength as possible and excellent durability and weather resistance. used.

To explain the order of installation work of the protection device according to the present invention shown in FIG.
, 10 are installed, four auxiliary ropes 14 are extended between these horizontal arms.

To do this, a helicopter is used to extend the wire between the horizontal arms 9 and 10, which are nylon ropes for wire extension, and after tying the ends of each of the four auxiliary ropes 14 prepared in advance on the side of the steel tower A to the wire extension rope, Four auxiliary ropes 14 are installed between the horizontal arms 9 and 10 by winding the extension ropes of the steel tower B@lever. Each auxiliary rope 14 is connected to the steel tower A, as described above.
Since the length is slightly more than twice the distance between B, the auxiliary rope 1
When the tip of the rope 4 reaches the horizontal arm 10, the auxiliary rope 14
The end of the first half of is in the horizontal arm 9, followed by the second half. Therefore, each starting point of the four bus ropes 11 is tied to the vicinity of each starting point of the latter half on the tower A side, and each auxiliary rope 14 is then wound on a tension reel on the tower B side. The starting end of the second half of the auxiliary rope reaches the horizontal arm 10, and the terminal end reaches the horizontal arm 9. Therefore, by tightening each bus rope 11 and fixing its starting and ending ends to the horizontal arms 1O and 9, respectively, these ropes will be in the state shown in Fig. 1, and each auxiliary rope 14 will have its front half on the tower B side. It is wound up on a reel and extended between horizontal arms 9 and 10 with the latter half generally following each busbar rope IIK.

Next, on the steel tower B side, a hanging cage 12 is installed between each busbar rope to connect the ropes laterally. To do this, first open and close 1@ of the roller tool 13 (Fig. 2) to engage it with the bus rope 11, then lock the corresponding part of the auxiliary rope 14 to the frame of this roller tool 130, and then When the upper ends of the hanging members 20 at both ends of the hanging basket 12 are engaged with the holes of the hanging tools 15 protruding from the lower surfaces of the adjacent roller tools 13, the hanging baskets 1
2 connects both busbar ropes 11 laterally and connects both roller tools 1
Suspended to 3. The above is the installation of the first hanging rope 12.Next, when each auxiliary lobe 14 is wound up on the tower A side and sent out on the tower B side, the hanging rope 12 moves from tower B to tower A along the bus rope 11. Move to. When the distance of this movement reaches a predetermined value, it is temporarily stopped and the second hanging hook 12 is attached in the same manner as described above. Thereafter, similar operations are repeated to complete the installation of the desired number of hanging hooks 12. Thereafter, the auxiliary rogue 14 is strung and fixed at both ends to the horizontal arms 9 and 10, completing the protective device as shown in the first figure.

To temporarily recover the hanging rope 12 as a measure against strong winds, etc., remove the fixation of the auxiliary lobe 14 from the horizontal arms 9 and 10, unwind the part that was wound up on the tower A side, and move it to the tower B side. The hanging rods 12 are sequentially moved by winding them up, and each time they are in a row on the side of the steel tower B, they are sequentially recovered.

At this time, in order to prevent the auxiliary lobe 14 from hanging inappropriately when it is fed out from the entrance side of the steel tower, a roller device is inserted into the bus rope 11 at appropriate intervals and the auxiliary lobe 14 is inserted into the bus rope 11 at appropriate intervals.
Lock 4. Next, when completing the overhead wiring work for all the electric lines and removing this protection device, first collect all the hanging ropes 12 on the tower B side as described above, and then first collect the busbar rope 1. The auxiliary lobe 14 is tightened between the horizontal arms 9 and 10, and the bus rope 11' and the steel tower A are connected to each other via the roller device that is engaged with the auxiliary lobe 14 as described above.
Wind it up to the side and collect it. Next, in order to retrieve the auxiliary lobe 14, its fixation with the horizontal arms 9 and 10 is released, and the
At the side, connect the nylon rope for wire extension to the end and attach it to the steel tower A.
Wind it up on the side and collect it. Finally, the nylon rope for wire extension is recovered on the ground, and the hog holding horizontal arms 9 and 10 are removed to complete the removal work.

In the above embodiment, the hanging cage 12 was used as a farm maintenance body that horizontally connects the busbar ropes, but the present invention is not limited to this, and may be a vertical plate-like structure, or in other words, an inflexible solid body. Bye.

According to the present invention, a roller tool and an auxiliary lobe are interposed between a plurality of bus ropes and a protector that laterally communicates between them, so that the protector can be installed at a desired location on the bus rope. In addition, all main members such as bus ropes, auxiliary lobes, and the above-mentioned protective body are made of electrically insulating materials to avoid electrical troubles and are lightweight, making all work easier. Besides the general effect of being nimble, in particular the vertical distance between the upper transmission line and the lower structure, since there is no downward sag due to the use of an inflexible solid body as the above-mentioned protector. This is suitable when the busbar rope is relatively short or the lateral spread of the busbar rope is relatively long, and is effective in reducing the need to construct protective scaffolding between adjacent towers.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a protection device constructed according to the present invention, and FIG. 2 is a detailed view of its essential parts.

Claims (1)

[Claims] When a multi-strand electric wire is installed across the sky above a structure between adjacent steel towers, the multi-strand electric wire is placed below and along the above-mentioned structure, and between the columnar bodies on both sides. A plurality of electrically insulating bus ropes are installed side by side, and a plurality of roller tools each having a built-in roller that rolls in contact with the bus ropes are provided along each of the bus ropes, and the frames of these roller tools are installed. Both ends of an inflexible solid body of electrically insulating material that connects the busbar ropes laterally are suspended, and electrically insulating auxiliary ropes are run along each busbar rope between the columnar bodies on both sides in the wire length direction. The auxiliary ropes are movably constructed and fixed to the frame of the roller tool at appropriate lengths, and each of the auxiliary ropes is tightened and both ends are fixed to the columnar bodies on both sides. A method for protecting structures below during power transmission line overhead line work that prevents contact between power lines and structures below.