JPH0226442B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In overhead power transmission line work, the present invention provides a method for installing multiple electric wires across the sky between adjacent steel towers, and in case of unforeseen circumstances during the overhead line work. This invention relates to a method for preventing contact with structures below, loss of liability, or damage to electric wires due to abnormal drooping. Note that this method is suitable when it is easy to construct the protective pillar scaffolding from the topographical environment and the distance between them can be set relatively short.

Conventionally, methods have been adopted to protect structures below during overhead line work, such as constructing protective scaffolding on both sides near the structure and erecting wire ropes in a net shape between them. Since the protective device is made of conductive material, if the underlying structure is electrical equipment, a long-term power outage is required to install the protective device, and sufficient measures must be taken to prevent contact between the protective device itself and the underlying structure. Because of the metal wire rope, contact accidents do not only result in a power outage on the lower power transmission line, but also have a serious impact on workers and the public.

The present invention belongs to the same type of construction of protective scaffolding as described above, but eliminates the use of metal wire ropes and uses a plurality of electrically insulating busbar ropes between the protective scaffoldings on both sides and a plurality of electrically insulating busbar ropes connecting them laterally. This is a method of constructing a hammock-like protection device consisting of electrically insulating horizontal protection ropes, thereby protecting the structure below. In this way, by making all parts of the hammock-shaped protective device from electrically insulating materials, the above-mentioned disadvantages of conventional protective devices made from metal materials are eliminated, and at the same time, since electrically insulating materials are generally lighter than metals, This has the advantage of making the installation work of the device easier. Note that if the lower structure is close to one of the steel towers, this steel tower may also be used as a protective scaffolding on one side, and only the protective scaffolding on the other side may be constructed.

The present invention furthermore provides that, in order to facilitate the work of constructing the hammock-shaped protective device, and to ensure the mechanical safety of the device in strong winds after the construction, the protective rope is connected to the busbar rope via a roller. It is connected in a movable relationship in the longitudinal direction of the line, and in order to operate this movement, an auxiliary rope of electrical insulation is attached along the busbar rope, and this is connected in a fixed relationship with the supporting frame of the roller. It is.

To explain one embodiment of the present invention with reference to the drawings,
In FIG. 1, A and B are two adjacent steel towers, and a portion of the power transmission line 4 that is about to be installed between them is already shown. There is an electric wire 7 stretched between both utility poles 5 and 6 below the power transmission line 4 as an existing lower structure, and this electric wire 7 is perpendicular or diagonal to the power transmission line 4 at a position approaching one of the steel towers A. are doing. A protection device according to the present invention is provided between a power transmission line 4 and an existing power line 7 below the power transmission line 4.
It will be strung along the

A protective horizontal arm 9, which is slightly longer than the lowermost arm 8 of the three horizontal arms (upper and lower) that supports the three-phase, three-wire, two-circuit power transmission line of the tower A, is fixedly installed on the tower A. On the other hand, the steel tower A holds the lower structure 7 in between.
A protective tower scaffolding 10 is constructed on the opposite side, and a protective horizontal arm 1 of the same length as the arm 9 is installed at its upper end.
1 is fixedly installed. Both horizontal arms 9 and 11 are installed in directions facing each other, and four generatrix ropes 12 are strung parallel to each other at appropriate intervals between them. A plurality of horizontal protection ropes 13 connecting these bus ropes laterally are installed along the length direction of each bus rope 12 at appropriate intervals,
A roller tool 14 is provided at each intersection of the plurality of busbar ropes 12 and the plurality of protection ropes 13. The rollers housed in each roller tool 14 are in a rolling relationship with each generatrix rope 12 in contact with it, and a frame supporting this roller is coupled to a corresponding portion of the protective rope 13 in a locking relationship. Ru. Further, an auxiliary rope 15 is provided along each busbar rope 12 so as to be movable therewith in the line length direction,
This rope is also coupled in a locking relationship to the roller support frame at a corresponding location. Although it is omitted in the drawing, the auxiliary rope 15 has a length more than twice the distance between the steel tower A and the protective steel tower scaffolding 10, and one half of it is shown in the drawing. The ends of this half are fixed to the horizontal arms 9, 11 on both sides as shown just before the completion of the erection operation.

2 shows the engagement relationship between the roller tool 14 combined with the outermost two of the four parallel generatrix ropes 12 in FIG. 1 and the associated ropes 13, 15, and FIG. shows a similar engagement relationship for the two inner busbar ropes 12. In the figure, the roller device 14 incorporates several horizontal rollers 16 and vertical rollers 17, each of which rolls in contact with the generatrix rope 12 passing through its central hole, and these rollers are connected to a frame surrounding the entire four circumferences of the roller device 14. It is supported by body 18. Although the detailed structure of the frame 18 is omitted in the drawings, it is configured such that a vertical roller 17 can rotate around its upper end on either side of the frame to open the enclosure of the central hole.
Therefore, the bus rope 12 can be inserted into and removed from the central hole of the roller frame 18 by opening and closing one side of the enclosure. A hanger 19 is fixedly installed to protrude from the lower surface of the frame 18, and corresponding portions of the horizontal protection rope 13 and the auxiliary rope 15 are locked in three holes of the hanger 19 via rings.
In FIG. 2, the end of only one protective rope 13 is locked in one hole of the hanging tool 19, and in FIG. They are respectively locked in the holes.

The bus rope 12, the horizontal protection rope 13 and the auxiliary rope 15 are all made of electrically insulating material,
Therefore, it is generally lighter in weight than metal. Further, it is desirable that these ropes have as high mechanical strength, durability, weather resistance, etc. as possible in view of the usage mode of the present invention. An example of a rope using a material that satisfies these conditions is the so-called Kepler rope, which uses a special high-strength organic fiber. In addition to having electrical insulation properties, this wire rope has approximately the same mechanical breaking strength as conventional wire ropes of approximately the same diameter, and is less than 1/3 the weight.

To explain the order of installation work of the protection device according to the present invention shown in FIG. 1, first, the protective horizontal arm 9 is installed on the steel tower A, and the horizontal arm 11 is installed on the protective steel tower scaffolding 10 constructed in advance, and then, Four auxiliary ropes 1 are connected between these horizontal arms 9 and 11.
Extend 5. To do this, a nylon or Kepler rope for wire extension is extended from a helicopter or the like between the horizontal arms 9 and 11, and each tip of four auxiliary ropes 15 prepared in advance on the tower A side is tied to the wire extension rope. After that, the four auxiliary ropes 15 are installed between the horizontal arms 9 and 11 by winding up the rope on the scaffold 10 side. Each auxiliary rope 15
has a length more than twice the distance between the steel tower A and the scaffolding 10 as described above, so when the tip of the auxiliary rope 15 reaches the horizontal arm 11, the end of the front half of the auxiliary rope 15 reaches the horizontal arm 9. Yes, and the second half follows. Therefore, on the side of the steel tower A, each starting point of the four busbar ropes 12 is tied to the vicinity of each starting point of the latter half, and then each auxiliary rope 1 is tied on the side of the scaffolding 10.
The starting end of each busbar rope 12 reaches the horizontal arm 11 and the terminal end reaches the horizontal arm 9 by winding up the bus rope 5 on a tension reel. So each bus rope 1
2 and connect the starting and ending ends to the horizontal arm 1, respectively.
1 and 9, these ropes will be in the state shown in FIG. 1, with the front half of each auxiliary rope 15 wound up on a reel on the scaffold 10 side, and the latter half roughly following each bus rope 12. .

Next, on the scaffolding 10 side, work begins to install the horizontal protection ropes 13 that connect the busbar ropes 12 laterally. Therefore, first, the starting end of each bus rope 12 (the first
A roller tool 14 as shown in FIG. 2 or 3 is engaged with the lower right end in the figure by opening and closing one side thereof, and each section of the protective rope 13 is inserted into the hole of the hanging tool 19 protruding from the lower surface. Attach both ends of the carabiner 20
Lock through. Further, a corresponding portion of the auxiliary rope 15 extending along the busbar rope 12 is locked in another hole of the hanging tool 19 via a carabiner 20. Thus, by pulling the auxiliary rope 15 on the side of the tower A, the rope device 14 moves along the busbar rope 12 with the rollers 16, along with the horizontally stretched protective rope 13.
17 to move smoothly. There, tower A
When each auxiliary rope 15 is wound up on the side and sent out on the scaffold 10 side, the first protective rope 1
3(1) moves from the scaffolding 10 side toward the steel tower A along the busbar rope 12. When the distance of this movement reaches the planned length, the movement is stopped and the same operation as above is performed for the next protection rope 13(2). That is, each second roller tool 14 is connected to each bus rope 1.
2 and lock each end of each protective rope section and the corresponding portion of each auxiliary rope 15 laterally in the hole of the hanging device 19, and then move each auxiliary rope toward the tower A for the planned length. Move it just a little. Thereafter, similar operations are repeated, and the series of operations ends when the required number of protection ropes 13n are finally sent out from the horizontal arm 11 on the scaffold 10 side. The protective ropes 13(1), (2), and n at the time of completion are indicated as (1), (2), and n, respectively, in FIG. 1. Thereafter, each auxiliary rope 15 is strung between the steel tower A and the scaffold 10, and both ends thereof are fixed to the horizontal arms 9 and 11, thereby completing the hammock-shaped protection device as shown.

Describing the procedure for recovering the protective ropes 13 as a countermeasure in times of strong winds, etc., first release the fixation of each auxiliary rope 15 to the horizontal arms 9, 11, and then remove each auxiliary rope that was wound onto the tower A side. 15
The protective rope 13 is moved to the scaffold 10 side by letting out half of it and winding it up on the scaffold 10 side. Therefore, first, when the protective rope 13n reaches the horizontal arm 11, the related roller device 14 is removed from the busbar rope 12 and the auxiliary rope 1 is removed from the hanging device 19.
5 and recover these roller tools 14 and the protective rope 13n attached to them. Next, extend the auxiliary rope 15 to the horizontal arm 11 by a predetermined length.
The next protective rope 13 is pulled towards the horizontal arm 1.
1, the same operation as above is performed to remove and recover the protective rope 13 and the associated roller tool 14. Thereafter, similar operations are repeated to complete the collection of the last protective rope 13(1) and related roller tool 14. As an emergency measure, when the horizontal arm 11 is reached, only the auxiliary ropes 15 and the hanging tools 19 can be sequentially unlocked, and all the protective ropes 13 can be bundled and tied to the arm 11. . The last protective rope 1 during the above recovery operation
3 (1) has advanced considerably towards the scaffold 10, the auxiliary rope 15 between this rope and the horizontal arm 9
In order to prevent this, the roller fittings 14 are inserted into the busbar rope 12 at appropriate intervals for the auxiliary rope between them, and the corresponding portions of the auxiliary rope are engaged with the roller tools 14. If the rope is stopped, the drooping of the auxiliary rope can be restricted.

Describing the procedure for removing the above-mentioned protective devices after the overhead wiring work for all electric lines between adjacent towers A and B is completed, first, all protective ropes 13 and related After collecting the roller tools 14, each auxiliary rope 15 is tightened between the steel tower A and the scaffolding 10, and each bus rope 12
is released, and the busbar rope 12 is pulled in the direction of the steel tower A via another roller tool 14 that is locked to the auxiliary rope 15 to be wound up and collected. Next, to recover the remaining auxiliary rope, release the tension fixing between the steel tower A and the scaffolding 10, connect the wire extension rope to the auxiliary rope on the tower A side, and connect the wire extension rope to the scaffolding 10.
Wind up and collect the auxiliary rope on the side. Finally, the wire extension rope is wound up and collected on the ground, and the horizontal arm 9 and protective scaffolding 10 are removed to complete the removal work.

According to the present invention, during overhead wiring work involving multiple electric wires between adjacent steel towers, damage to the lower structure due to abnormal drooping of the electric wires during overhead wiring work is prevented by using an electrically insulating hammock-like protective device, and In addition to the effect of being able to avoid electrical troubles, the assembly work of the protective device can be simplified by providing an auxiliary rope and a roller tool that are movable in the line length direction in relation to the busbar rope. In addition, the horizontal protection rope can be easily recovered in order to avoid damage to the protection device during strong winds.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a protection device according to the present invention;
2 and 3 are perspective views of two partial elements in FIG. 1; FIG. A, B: Adjacent steel tower, 4: Multi-strand electric wire, 7: Lower structure, 9, 11: Horizontal arm, 12: Bus rope, 13: Horizontal protection rope, 14: Roller tool, 1
5: Auxiliary rope, 16, 17: Roller, 18: Roller frame.

Claims (1)

[Claims] 1. When installing multiple electric wires across the sky above a structure between adjacent steel towers, the structure shall be sandwiched in the direction along the multiple electric wires, and each protective horizontal column shall be installed on each side of the structure. Arms are installed facing each other, and a plurality of electrically insulating bus ropes are interposed between these horizontal arms at appropriate intervals between the multi-strand electric wire and the structure below it. An electrically insulating auxiliary rope having a length slightly more than twice the distance between the two horizontal arms is installed along each of these busbar ropes in a movable relationship in the line length direction with respect to each corresponding busbar rope. A plurality of roller tools having built-in rollers that roll in contact with each bus rope are provided along the line length direction of each bus rope, and these roller tools are positioned at appropriate intervals from each other. and lock the frame to the corresponding position part of either half of each corresponding auxiliary rope,
A plurality of electrically insulating horizontal protection ropes are locked to each of the roller frames at the intersection position with each busbar rope along the line length direction of each busbar rope that horizontally connects the plurality of busbar ropes, Thus, by fixing both ends of the half portions of each auxiliary rope to both horizontal arms, a hammock-like protection device consisting of a plurality of bus ropes and a plurality of horizontal protection ropes is used to protect the upper multi-strand electric wire from the lower one. A method for protecting lower structures during power transmission line installation work that prevents contact with structures.