JP7076744B2 - How to replace the overhead ground wire - Google Patents

Description

The present invention relates to a method of replacing an overhead ground wire passed between utility poles by using a wire tensioning device.

A spiral cable support called a spiral hanger is placed along the messenger wire erected between the utility poles, and the cable is passed between the utility poles by passing the guide wire inside using this spiral hanger as a guide. Are known. A specific example of this is shown in FIG.

FIG. 5 shows the conventional extension method as described above. A messenger wire 101 is stretched between two utility poles 100, and a spiral hanger 102 is arranged so as to spirally wind around the messenger wire 101. As can be seen from FIG. 5, the spiral hanger 102 is wound with a gap between it and the messenger wire 101.

When passing the cable between the two utility poles 100, first, the guide wire 103 is passed through the gap between the messenger wire 101 and the spiral hanger 102 described above. At this time, a leading tool 104 is attached to the tip of the guide wire 103 so that the guide wire 103 does not come off from the spiral hanger 102. With this leading tool 104, it is possible to proceed stably without coming off the spiral hanger 102.

The tip of the cable to be extended is connected to the tip of the guide wire 103 passed between the utility poles 100 in this way. Then, by pulling back the guide wire 103, the cable can be passed between the utility poles 100. Such a technique is described in Patent Document 1.

By using the method described above, the cable to be extended can be reliably passed between the utility poles without hanging downward, so that the work can be performed safely without interfering with the equipment below. ..

By the way, an overhead ground wire (GW: ground wire) for the purpose of lightning damage countermeasures is installed in the trunk line portion of the high-voltage distribution line and the branch portion of 5 spans or more connected to the trunk line portion.

This overhead ground wire is installed at the tip of the overhead ground wire mounting hardware attached to the head of the utility pole. When replacing the overhead ground wire, a method using a spiral hanger as described above can be used.

Patent Document 2 describes a wire tensioning device for holding an overhead ground wire in a state where tension is generated in the overhead ground wire mounting hardware at the utility pole head.

Japanese Unexamined Patent Publication No. 2010-233434 JP-A-2017-127076

However, when the above-mentioned wire tensioning device is used in the replacement work of the overhead ground wire, the tension wire direction is not always constant. In addition, there are various facilities around the head of the utility pole, and it may be difficult to work safely while avoiding interference with those facilities. Therefore, in order to keep the working conditions constant and avoid interference with peripheral equipment, it is desirable to eliminate the bias with respect to the tension and to design the wire tensioning device compactly.

Therefore, the present invention provides an overhead ground wire re-covering method using a wire-stretching device that can maintain a certain working condition even when the wire-stretching direction is different and does not easily interfere with surrounding equipment. The purpose is to do.

In order to achieve the above object, the overhead ground wire replacement method of the present invention is a wire tensioning device in which a clamp portion for gripping the overhead ground wire mounting hardware on a utility pole is provided on an extension line in the sliding direction of the wire gripper. It is a method of replacing the old overhead ground wire with the new overhead ground wire by using the above, and the process of installing the spiral hanger along the old overhead ground wire and the above-mentioned overhead ground wire mounting hardware. The step of installing the wire tensioning device by arranging the wire gripping device on the side opposite to the tensioning side of the new overhead ground wire, and the position of the overhead ground wire mounting hardware side in the slidable area. The step of moving the wire gripper, the step of fixing the tip of the new overhead ground wire lifted onto the utility pole and sent along the spiral hanger to the adjacent utility pole, and the step of fixing the new wire to the adjacent utility pole. It is characterized by including a step of sliding and pulling up the wire gripping device that holds the overhead ground wire so as to keep it away from the overhead ground wire mounting hardware.

Further, in the method for replacing the overhead ground wire of the present invention, in addition to the above configuration, the extension side of the new overhead ground wire that has been stretched to the planned installation position by the gripping device is used as the overhead ground wire mounting hardware. It is characterized by including a step of fixing.

Further, in the overhead ground wire replacement method of the present invention, in addition to the above configuration, a step of installing a guide pipe through which the new overhead ground wire is passed so as to extend in the vertical direction on the side of the utility pole, and the guide. It is characterized by including a step of lifting the new overhead ground wire onto the utility pole through a pipe.

As described above, according to the present invention, the clamp portion for gripping the overhead ground wire mounting hardware is provided on the extension line in the slide direction of the wire gripping device, and the overhead ground wire mounting hardware is used for the overhead ground wire mounting hardware. The grabber is placed on the opposite side of the new overhead ground wire. As a result, it becomes possible to proceed with the stretching work in a state of being aligned so as to pass above the overhead ground wire mounting hardware from the beginning.

Further, according to the present invention, in addition to the above effect, of the new overhead ground wire, the side aligned above the overhead ground wire mounting hardware becomes the stretching side as it is, so that the specified tension for stretching is used. There is no need to horizontally align the new overhead ground wire after reaching.

Further, according to the present invention, in addition to the above effects, a guide pipe is installed so as to extend in the vertical direction on the side of the utility pole, and the guide pipe is lifted to the top of the pole through a new overhead ground wire in the guide pipe. The new overhead ground wire can be placed along the old overhead ground wire safely and in a short time by preventing the interference of the above.

It is an overall perspective view of the wire tensioning apparatus used in the overhead ground wire replacement method of this invention. It is a figure which shows the use state of the wire tensioning apparatus of FIG. It is a top view of the wire tensioning apparatus of FIG. It is a schematic diagram which shows the internal structure of the wire tensioning apparatus of FIG. It is a figure which shows the conventional cable wire drawing method.

Hereinafter, the wire tensioning device used in the overhead ground wire replacement method according to the embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view of a wire tensioning device 1 used in the overhead ground wire replacement method of the present invention. The wire tensioning device 1 includes a wire gripping device 2 for gripping an overhead ground wire, a slide portion 10 for sliding the wire gripping device 2, and a clamp portion 20 for fixing itself to the utility pole side.

First, the configuration of the slide unit 10 will be described.

A feed screw mechanism is used for the slide mechanism of the slide portion 10. Two guide bars 14 are arranged in parallel with one screw shaft 13. The screw shaft 13 is arranged through the center of the base portion 11 by screwing. Further, the two guide bars 14 are similarly slidably arranged on both sides of the base portion 11 with the screwing position of the screw shaft 13 interposed therebetween. As a result, the base portion 11 can be slid in the longitudinal direction of the screw shaft 13 by the shaft rotation operation of the screw shaft 13.

A support arm 12 is erected on the base portion 11. The gripping device 2 is connected to the support arm 12 so as to be swingable upward.

Subsequently, the configuration of the clamp portion 20 will be described.

Since the clamp portion 20 is arranged on the extension line of the screw shaft 13, the fixing target can be installed so as to be aligned with the extension line of the screw shaft 13. The clamp portion 20 is formed by a portion formed in a substantially U-shape in a plan view and an opening / closing frame 22 for opening and closing the U-shaped opening portion. The opening / closing frame 22 can be opened / closed by rotating around the shaft support bolt 15 with the knob 25 loosened. Further, a pressing bolt 23 is arranged through the opening / closing frame 22 toward the inside, and a pressing plate 24 is connected to the tip of the pressing bolt 23. Thereby, it can be pressure-welded and fixed to the gripping object. The pressing plate 24 is attached to the pressing bolt 23 so as to be relatively rotatable, and is formed in a disk shape as shown in FIG. As a result, the opening / closing operation of the opening / closing frame 22 can be performed without the pressing plate 24 interfering with the inner wall of the above-mentioned U-shaped portion. In addition, even when the pressing plate 24 rotates with respect to the shaft rotation of the pressing bolt 23, it is possible to prevent interference with the inner wall of the U-shaped portion in the same manner, so that the pressing bolt 23 can be used for tightening. The operation can be performed smoothly.

On the side of the clamp portion 20, two input shafts 21 are arranged to face each other in the horizontal direction orthogonal to the longitudinal direction of the screw shaft 13. The screw shaft 13 is rotated by the rotation input from at least one of the input shafts 21. This rotation transmission mechanism will be described later.

FIG. 2 is a diagram showing a usage state of the wire tensioning device 1 of FIG.

An overhead ground wire mounting hardware 37 is installed at the upper end of the utility pole 100, and it is shown that the old overhead ground wire 33 to be replaced is erected at the upper end of the overhead ground wire mounting hardware 37. The above-mentioned wire tensioning device 1 is used to replace the old overhead ground wire 33 with the new overhead ground wire 34 (indicated by a two-dot chain line in the figure). The wire tensioning device 1 is fixed to the overhead ground wire mounting hardware 37 by a clamp portion 20 (see FIG. 1). A spiral hanger 35 is wrapped around the old overhead ground wire 33. The spiral hanger 35 is arranged for a guide between the adjacent utility pole (not shown) on which the new overhead ground wire 34 is stretched.

The new overhead ground wire 34 is pulled up from below the utility pole 100. At the time of this pulling up, in order to avoid interference with the high voltage line 36, the new overhead ground wire 34 is passed through the guide pipe 32 supported at a position separated from the high voltage line 36 by the support rods 30 and 31. Then, the tip of the pulled up new overhead ground wire 34 is sent to the adjacent utility pole side through the inside of the spiral hanger 35.

The new overhead ground wire 34 connected to the adjacent utility pole side in this way is pulled up by the wire tensioning device 1 fixed to the overhead ground wire mounting hardware 37.

Here, a plan view of the wire tensioning device 1 is shown in FIG.

As shown in FIG. 3, the wire tensioning device 1 used in the overhead ground wire replacement method of the present invention is provided with a screw shaft 13 substantially in the center in a plan view. Then, the wire gripping device 2 is connected so that the overhead ground wire can be gripped directly above the screw shaft 13.

Further, a clamp portion 20 is provided on the extension line of the screw shaft 13 as described above. Since it is configured in this way, the wire gripping device 2 of the wire tensioning device 1 is slid operation without the new overhead ground wire 34 to be stretched coming off directly above the overhead ground wire mounting hardware 37 (see FIG. 2). Ru.

Therefore, in the process of increasing or decreasing the tension, the reaction force does not generate a force that causes the wire tensioning device 1 to rotate around the overhead ground wire mounting hardware 37, and stable work can be performed.

In FIG. 3, a one-dot chain line is superimposed on a line passing through the center of the screw shaft 13, the wire gripper 2, and the clamp portion 20.

Further, as described above, since the wire tensioning device 1 is configured symmetrically in a plan view and the input shaft 21 is provided on either side, the operator can perform the work from any side. It is possible. Depending on the work environment, it is assumed that electric wires, distribution equipment, buildings, trees, etc. are close to each other or congested, but since it is equipped with two input shafts 21, the degree of freedom in work can be improved. .. This is also advantageous when the wire tensioning device 1 is inverted and used at the same position.

Next, the internal structure of the wire tensioning device 1 is shown in FIG. Here, the wire tensioning device 1 of FIG. 1 is schematically shown in a plan view to the extent that the overall configuration can be understood, and for convenience of explanation, the wire gripping device 2 and other detailed configurations are shown. Is omitted.

In FIG. 4A, bevel gears 27 and 28 are provided facing each other on each of the two input shafts 21, and these bevel gears 27 and 28 are connected to the bevel gear 26 provided on the screw shaft 13. Shows the configured configuration. Since it is configured in this way, the screw shaft 13 can be operated from any of the two input shafts 21 facing each other.

Further, since the bevel gear 26 of the screw shaft 13 is shared, the rotation direction toward the side where the tension is increased is the same for any input shaft 21. Therefore, even when the wire tensioning device 1 is used by reversing it or when the working positions are exchanged, it is difficult for the operator to make a mistake such as performing a reverse operation. This makes it possible to prevent the occurrence of human error.

As the bevel gears 26 to 28 described here, it is desirable to use a miter gear because it can be configured compactly if sufficient force can be transmitted. However, if there are no space restrictions and operability is important, bevel gears may be used.

Not limited to the configuration of FIG. 4 (a), it is also possible to adopt the configurations of FIGS. 4 (b) and 4 (c) described below.

FIG. 4B is arranged in the direction opposite to the bevel gear 29 provided on the screw shaft 13. Other configurations are the same as in FIG. 4 (a).

In FIG. 4C, two opposing bevel gears 26 and 29 are provided on the screw shaft 13 side. Of these, the bevel gear 27 of the input shaft 21a is connected to the bevel gear 26, and the bevel gear 28 of the input shaft 21b is connected to the bevel gear 29. In the case of the configuration of FIG. 4 (c), unlike the configurations of FIGS. 4 (a) and 4 (b), the rotation directions of the input shafts 21a and 21b are not the same with respect to the change in tension. Therefore, when the input shafts 21a and 21b are changed during the work, it is necessary to reverse the operation. However, when operating by reciprocating operation using a ratchet tool or the like, the direction in which the force is applied and the direction in which the tension changes match, so that the work can be performed intuitively.

The configuration shown in the above embodiment is an example of the present invention, and includes the following modifications.

In the above embodiment, the configuration in which the guide bar 14 is arranged on the side of the screw shaft 13 is shown as an example, but it can be arranged below or above as long as it does not interfere with the wire gripping device 2. .. Further, as long as the configuration can be balanced, the configuration is not limited to two, and one or three or more may be used.

Further, in the above embodiment, the configuration in which the opening direction of the clamp portion 20 is formed so as to be the extension direction of the screw shaft 13 is shown as an example. However, the opening may be formed in a direction orthogonal to the screw shaft 13 as long as the gripping object can be accommodated and fixed on the extension line of the screw shaft 13.

Further, in the above embodiment, the configuration in which the input shaft 21 is orthogonal to the screw shaft 13 and is arranged so as to face each other in the horizontal direction is shown as an example. However, if the configuration does not upset the balance in a plan view, it is sufficient to have at least one input axis, and it is not necessary to arrange them in the horizontal direction.

Further, in the above embodiment, the support arm 12 may be attached to the base portion 11 so as to be movable in the horizontal direction and in the direction perpendicular to the screw shaft 13. Alternatively, the support arm 12 may be connected to the base portion 11 so as to be swingable in a direction perpendicular to the screw shaft 13, and the swing angle thereof may be adjustable.

As the social infrastructure of the overhead ground wire of the distribution line deteriorates over time, it becomes necessary to replace it. However, the overhead ground wire can be easily replaced by the overhead ground wire replacement method of the present invention.

Further, in the method of replacing the overhead ground wire of the present invention, since the center positions of the clamp portion and the wire gripping device coincide with each other in a plan view, if the environment is such that the wire to be stretched and the mounting target do not interfere with each other, the building can be constructed. It can be used in a wide range of fields, such as the work of laying a master rope at the site.

1 Stretching device 2 Grip device 10 Slide part 11 Base part 12 Support arm 13 Screw shaft 14 Guide bar 15 Shaft support bolt 20 Clamp part 21, 21a, 21b Input shaft 22 Opening / closing frame 23 Pressing bolt 24 Pressing plate 25 Knob 26, 27, 28, 29 Umbrella gear 30, 31 Support rod 32 Guide pipe 33 Old overhead ground wire 34 New overhead ground wire 35 Spiral hanger 36 High pressure wire 37 Overhead ground wire mounting hardware 100 Electric pole 101 Messenger wire 102 Spiral hanger 103 Guide wire 104 Lead Ingredients

Claims (3)

Overhead wire tensioning that replaces the old overhead ground wire with the new overhead ground wire using a wire tensioning device in which the clamp part that grips the overhead ground wire mounting hardware on the utility pole is provided on the extension line in the slide direction of the wire gripper. It ’s a replacement method,
The process of installing the spiral hanger along the old overhead ground wire,
A step of installing the wire tensioning device so that the gripping device is arranged on the side opposite to the tensioning side of the new overhead ground wire with respect to the overhead ground wire mounting hardware.
The process of moving the wire gripper to the position on the side of the overhead ground wire mounting hardware in the slideable area, and
A step of fixing the tip of the new overhead ground wire lifted on the utility pole and sent along the spiral hanger to the adjacent utility pole.
The overhead ground wire replacement comprising a step of sliding the wire gripping device holding the new overhead ground wire fixed to the adjacent utility pole so as to move away from the overhead ground wire mounting hardware and pulling it up. Method. The overhead ground wire tensioning according to claim 1, further comprising a step of fixing the tensioning side of the new overhead ground wire stretched to the planned installation position by the wire gripping device to the overhead ground wire mounting hardware. How to replace. The process of installing the guide pipe through which the new overhead ground wire passes so as to extend in the vertical direction on the side of the utility pole, and
The method for replacing an overhead ground wire according to claim 1 or 2, further comprising a step of lifting the new overhead ground wire onto the utility pole through the guide pipe.

Images