JPH0236705A - Tensionless wire-replacing method of overhead earth-wire - Google Patents

Abstract

PURPOSE:To facilitate the work by laying an extension rope along an existing earth-wire then winding a rope or a string spirally therearound thereby preventing loosening of the existing earth-wire. CONSTITUTION:A supporting pole 6 is secured to each mast 1 and a master wire 7 is stretched between the poles 6. A lashing machine 9 is suspended from the master wire 7, then a packing string 11 integrally composed of an existing earth-wire 5 and an extension rope is wound spirally with the extension rope 18 being fed out from a drum 16 thus lashing them. A new earth-wire 22 is connected to the rear end of the extension rope 18 then the existing earth-wire and the extension rope are pulled at one end of the mast 1 and separated through a separation body 23 and wound around drums 24, 25. A new earth-wire 22 is fed out from the other end of the mast 1, with the drum 26 braked.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a ground wire support rod or a ground wire cap provided at the top of a utility pole, etc. that supports an overhead high voltage distribution line on a cross arm, that is, at the top of the utility pole. This relates to a method of replacing an overhead grounding wire supported by the main unit or the head of a utility pole with a new one.

(Prior art) When replacing the existing overhead grounding wire with a new one while the high-voltage overhead distribution line remains live, a new grounding wire, that is, a replacement wire, and an old grounding wire that is removed from the top. Care must be taken to ensure that the wires, ie, the wires to be re-strung, do not sag during the re-stretching operation and come into contact with the high-voltage overhead distribution lines supported by the arms of the utility poles.

Therefore, especially at present, when there is no method for replacing the grounding wire while the line is live, the following method can be devised considering the existing methods for extending the wire.

First, a large number of moving metal cars were suspended from the re-covered wire.

One method is to have each mobile metal wheel support the re-stretching wires and bring them close to the top of the utility pole to perform the re-stretching work, or to install balls near the top of each utility pole and place them between the poles. Separately, a main line or metsenger wire is stretched, a large number of moving metal cars are suspended from this main line, and the re-stretching line is supported by each of these moving metal cars, and these are brought close to the top of the utility pole and the re-covering is carried out. One possible method is to have the wires supported by each of these movable metal carts and pull them out from one end of a large number of utility poles to carry out the re-stretching work.

(Problem to be Solved by the Invention) However, according to the former method, a large number of gold wheels are suspended from the old overhead grounding wire that is about to be replaced, which puts a strain on the fragile wire to be replaced. However, unforeseen situations such as wire breakage are also expected, and reliability is lacking. On the other hand, the latter method is not always satisfactory because it requires the preparation of a large number of movable gold wheels and also requires a great deal of labor and time to suspend a large number of movable gold wheels from the main line. In addition, the re-covered wire is fragile as described above, and there is a risk of it breaking midway, and at the same time, it is not possible to pull it out by passing it through a large number of movable metal wheels since the outer periphery is loose.

Therefore, there is a need for a new method that can safely and efficiently carry out replacement work while avoiding contact with live high-voltage overhead distribution lines.

(Means for Solving Problem I) This invention was made in response to such a demand, and when removing the forward grounding wire, the forward earthing wire is lashed together with the extended rope with a suitable string or rope, and The above problem is solved by removing the forward grounding wire without sagging downward or applying tension to the forward grounding wire, pulling out a new grounding wire with the above-mentioned wire extension rope, extending the wire, and performing replacement work. It is something to do.

The specific configuration of the present invention is that a main wire is stretched between a large number of utility poles along a forward grounding wire, a lashing machine is supported on this main wire, and the inner cylinder of this lashing machine is provided with the above-mentioned sequential grounding wire. The lashing machine and drum are moved through the wire and one end of the extended wire rope attached to the forward earthing wire, and an appropriate string or rope fed out from the lashing machine is spirally wound around the outer periphery of the forward earthing wire and the extended wire rope. In this state, these forward grounding wires and extension ropes are pulled down from one end of a large number of utility poles, and a new grounding wire connected to the rear end of this extension rope is extended between each utility pole. This replaces the grounding wire. In order to attach the above-mentioned wire extension rope to the forward grounding line, the wire extension rope is stretched between a number of utility poles in advance along the forward earthing line, or a drum around which the wire extension rope is wound is provided in front of the lashing machine.
There is a method in which one end of this extended rope is connected to the end of a forward grounding wire, and the extended rope is naturally paid out by movement of the lashing machine and follows the forward grounding wire.

(Function) The forward earthing wire is old and has become weak, so tension cannot be applied to it, but in the construction method of this invention, a stretched rope is attached to the forward earthing wire, and an appropriate rope or string is spirally wound around the outer circumference of the wire. Because it is wound in a shape, the forward grounding wire does not sag when there is no tension. This is because the sequential grounding wire is removed from between each of the utility poles by applying an appropriate tension to the wire extension rope lashed together and pulling the extension rope from one side end of a number of utility poles. Furthermore, since a new ground wire is connected to the rear end of the extension rope, a new ground wire is automatically extended by pulling down the extension rope.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a arm 2 is provided at the top of each of the numerous utility poles 1, and a three-phase high-voltage distribution line 3 is stretched across each arm 2. Ground wire caps 4 are fixed to the ground wire caps 4, and a sequential ground wire 5 is stretched between the tops of the respective wire caps 4, that is, above the high voltage distribution line 3.

Therefore, in the replacement work, support balls 6 are first fixed to each line cap 4 of each utility pole 1. A main wire 7 is stretched between each of these support balls 6.

The main wire 7 is made of an insulating rope with little elongation, such as Cabler Rope (trade name), and is tightened using a wire tensioner 8 at both ends of a large number of utility poles 1. And Figures 2 and 4
As shown in the figure, a lashing machine 9 is suspended from a main wire 7.

A forward grounding wire 5 is loosely passed through an inner cylinder 9a of this lashing machine 9, and packing strings 11 are wound around the outer circumferences of bobbins 10 and 10 provided in an outer cylinder 9b, respectively. Further, a support arm 12 is provided protruding from the front end of the inner cylinder 9a, and one end of the suspension arm 14 on which the roller 3.13 is placed on the main wire 7 is connected to the support arm 12.
It is connected and fixed to the upper end of the. Further, a drum support frame 17 that rotatably supports a drum 16 is fixed to the tip of a protruding arm 15 that protrudes forward from the support arm 12.
7 is suspended from the main wire 7 by rollers 17a, 17a. A wire rope 18 is wound around the drum 16, and one end of the wire rope 18 is pulled out and passed through the inner cylinder 9a of the lashing machine 9.

It is fixed to the ground wire cap 4 of the utility pole 1 at the right end in FIG. Then, a traction rope 20 is connected to the hook 19 of the support arm 12 of the lashing machine 9, and the traction rope 20 is pulled in the direction of the arrow in FIGS. 2 and 4. As a result, the lashing machine 9 is pulled along the main line 7, and the heavy grounding line 5 and the extended rope 18 at the rear of the lashing machine 9 are integrated, and the packing cord 11 is wound helically around the outer periphery of these lines. In this way, the extended rope 18 is attached along the entire length of the eyelet line 5 from one end side to the other end side of the large number of utility poles 1, and is lashed by the packing cord 11. Then, as shown in FIG. 3, a wire extension roller 21 is provided on the ground wire cap 4 of each utility pole 1, and the heavy ground wire 5 and wire extension rope 18 are pulled out from one end side of a large number of utility poles 1. Connect a new ground wire 22 to the rear end.

Therefore, the heavy grounding wire 5 and the extended rope 18 are pulled at one end of a large number of utility poles 1, separated by a separator z3, and wound around each drum 24, 25. At the same time, the other end of a large number of utility poles 1 is pulled. Now, a new grounding wire 22 is fed out while applying brakes to the drum 26. As a result, the heavy grounding wire 5 is removed from between the many utility poles 1, and a new grounding wire 22 is stretched.

When pulling out the heavy grounding wire 5 and the extension rope 18 and extending the new grounding wire 22, tension or brakes must be applied at both ends of the numerous telephone poles 1, that is, on the feeding side and on the drawing-out side, to prevent them from hanging downward. However, in order to maintain the sag of 2% to 1% = d, the span of each utility pole 1 should be 50 m = s, and the grounding wire should be 30 sq/0.23 kg/m =
In the case of w, the tension T is approximately 72 kg from the formula T = @:1
A tension of ~144 kg is sufficient, and therefore it can be carried out with a simple device.

In addition, at the 23 locations of the above-mentioned separation body, the heavy grounding wire 5 and the extended rope 1
8 are separated, and at the same time, the packing cord 11 wound around the outer periphery of these is removed. For this purpose, when the separator 23 is interposed between the heavy ground wire 5 and the extended rope 18, the packing cord 11 is held down by the separator 23 and loosens, making it easy to unravel.

Further, the support poles 6 in the above embodiment include a retaining support pole 6a and a drawing support pole 6b.

FIG. 5 shows a restraining support pole 6a, in which one side of the base 27 is pressed against the side of the ground wire cap 4, and the band 28 is wound around the outer periphery of the ground wire cap 4 and fixed. A pole 29 is erected from the pole 27, and one end of the main wire 7 is locked to an annular stop 30 at the upper end of the pole 29. Further, FIG. 6 shows a support pole 6b for drawing through, in which the base 31 is pressed against the side of the ground wire cap 4, the band 32 is wound around the outer periphery of the ground wire cap 4, and the band 32 is fixed. A pole 33 is erected from the pole 31, and a J-shaped hook 34 at the upper end of the pole 33 presses and locks the main wire 7.

(Effects of the Invention) This invention has the above-described configuration, and when replacing the grounding wires between a large number of utility poles, it is possible to stretch the main wire along the heavy grounding wire, and to separate the extended rope and the heavy grounding wire using a lashing machine. The work is completed with extremely few steps, including lashing, pulling out the extended rope and heavy grounding wire, and simultaneously extending the new grounding wire. Moreover, when the above-mentioned lashing machine is used to lash the stretched rope and the heavy ground wire, the lashing machine is equipped with a drum around which the stretched rope is wound in front of the lashing machine. The string or rope can be automatically wound spirally around the outer periphery of the cutout line, making the work extremely simple, and therefore the entire replacement work can be done easily and quickly. Also, since the extended rope and the heavy ground wire are lashed, the extended rope is pulled and the heavy ground wire is pulled out along with it.

A device that allows the lower grounding wire to be pulled out from the top of each utility pole without applying tension to the heavy grounding wire or sagging, and therefore allows safe replacement work even if the high-voltage distribution line on each utility pole is live. It is.

[Brief explanation of the drawing]

Claims (1)

[Claims] A main wire is stretched between a large number of utility poles along the old grounding wire, a lashing machine is supported by this main wire, and the old grounding wire and the extension along this old grounding wire are installed in the inner cylinder of this lashing machine. The line rope is passed through, the lashing machine is moved, and an appropriate string or rope fed out from the lashing machine is spirally wound around the outer periphery of the old ground line and the extended line rope. A tension-free replacement method for overhead grounding wires, which is characterized by pulling down the old grounding wire and extension rope, and extending a new grounding wire connected to the rear end of the extension rope between each utility pole.