JPH05921B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for extending power transmission lines, particularly for UHV, for which construction is currently being carried out.
This concerns the method of replacing power transmission lines with old power transmission lines.

(Conventional technology) The conventional power transmission line resurfacing method involves re-supporting each tower attachment point of the old line on a metal wheel, connecting the new line to the end of the old line at the end of the extended line span, and then The new line can be extended by pulling out the new line by pulling out the new line. A continuous group of movable gold cars is moved by a towing machine, etc., holding the wire, and after reaching the other end of the tower, the tension on the old line at the top is relaxed and the tension on the new line at the bottom is increased. Then, both lines and the moving metal wheel group are reversed, and the moving metal wheel holding the old line at the bottom is suspended on the new line, which is now in the upper position, and the connecting rope is wound up, and the old line is recovered. It was something to do.

(Problems to be Solved by the Invention) Although both of these construction methods are simple in construction, they leave a number of problems. In other words, in the pulling construction method, the wire passes through the metal wheels that are the support points of each steel tower, which often causes damage to the new wire due to screw action, etc., and in order to prevent the wire from sagging between the towers, It was necessary to construct protective scaffolding beneath the line, and the tension in the line was quite large, which could sometimes damage the new line. In addition, for the method of reversing using a moving gold wheel, it is most preferable to perform the construction work every one span, and after reversing, a group of mobile gold wheels holding the old line will be moved on the new line, so this will also be carried out on the new line. It was causing damage. In addition, these construction methods are usually carried out line by line, leaving many problems with the multi-line extensions used for UHV power lines.
Therefore, the present invention provides a construction method for relining a UHV multiconductor power transmission line without having to pass a steel wheel on a new line, without installing another pulley on the new line, and without applying excessive tension. It is something.

(Means for solving the problem) In order to solve the above problem, in the present invention, two support lines W and a connecting rope R are stretched between the engine station and the drum station at both ends of the wire span, and the drum station on the ground is Transporter B group, which is connected at a predetermined interval with connecting ropes R, is moved and placed directly under the old line conductor in the span, and two strips of old line C are removed and carried by transporter B, and then moved to the drum field. Move the carrier group B in the reverse direction to retrieve the old line C, hold the new line A in the empty carrier group B, and deploy it again to the extended track span, and then move it to the predetermined line in the following two strips at a time. This is repeated for Therefore, the new line A will be transported by the carrier B, and the line can be extended without passing through the pulleys and applying excessive tension as described above.

(Example) Describing the details of the construction method below, the support line is installed between the drum field and engine field under the steel towers at both ends of the wire span.
Extend the W2 wire and the connecting rope R, and the drum field side steel tower supports the 3 wires with supporting metal fittings HG, and the engine field side steel tower is supported with a metal wheel. Support metal fittings HG are 2nd and 3rd
As shown in the figure, a substantially U-shaped frame 2 is attached to the lower part of the attachment part 1 to the steel tower, which can be rotated in the horizontal direction, with the lower part open, and the lower ends of both sides 21, 21 have support wire gripping parts on both sides. 3 is installed protrudingly. The support wire gripping section 3 integrally has a support wire clamp section 31 and guide grooves 32 on both sides thereof through which a pulley of a carrier B, which will be described later, passes.

Further, between the lower ends of both sides 21 and 21 of the frame body 2, a windmill type metal wheel 4 is used to support the connecting rope R.
Its composition is as follows. Two rotary plates 45 each having a fitting groove 41 that opens radially from the center toward the circumference, and a sliding holding portion 43 concentrically provided at the edge of each side 42 held by the fitting groove 41. The sliding holding parts 43 of the guide body 5 face each other, have rollers 51 at both ends in the length direction between them, and have arc-shaped flange 52 on both sides corresponding to the sliding holding parts 43 of the rotating plate 45. 52 into the sliding holding parts 43 of the rotary plates 45, 45, respectively, and the shafts 46 passing through the centers of both the rotary plates 45, 45 are attached to both sides 21, 2 of the frame 2.
It is fixed to 1. In addition, as shown in Figures 4 and 5, the carrier has a pulley 6 at the upper position that rides on two support wires, a connecting rope fixing part 7 is provided at the lower part of the pulley 6, and wire conveying ropes are provided on both sides of the lower position. It has a wire receiving roller 8, and a lid 9 is provided on the upper part of the roller to prevent the wire being transported from falling off from the carrier.

A method of replacing an old multi-conductor line with a new UHV multi-conductor line in one span using the support bracket HG and carrier B with the above configuration is as follows: A pilot rope is stretched, two support wires are connected to the pilot rope via a yoke, and a connecting rope is connected between them.The pilot rope is wound up at the engine station under the steel tower at the end of the span, and the above three wires are connected to the old wire. Install directly below the conductor. Next, replace the metal wheel hanging the 3 wires on the drum field side steel tower with the support bracket HG, and secure the 2 support wires at the engine field and drum field, respectively. The connecting rope is held on the guide body 5 inside the windmill type metal wheel 4 of the support fitting HG.

By fixing the carriers B to the connecting ropes R at predetermined intervals on the ground at the drum field side and winding them up at the engine field side, the carrier group is moved onto the support line W of the span and deployed, and the two old lines are removed. They are each dropped into carrier B. To explain the movement of this group of carriers, the two support lines supported by the support fittings HG of the steel tower on the drum field side are connected to the clamp part 3 of the support line grip part 3.
1 in a push-up manner, and the clamp part 31
has a shape corresponding to the groove shape of the pulley 6 of the carrier B, and is configured so that the carrier B moving on the support line can easily pass through. Also, the connecting rope R is a windmill type metal wheel 4
The frame of the connecting rope fixing part 7 is supported on the guide body 5 of the windmill type metal wheel 4, and when the carrier approaches an obstacle by winding it up at the engine station, the frame of the connecting rope fixing part 7 touches both rotating plates 4 of the windmill type metal wheel 4.
It fits into the fitting groove 41 of No. 5, 45, and is further moved by the connecting rope R, so that it rotates the rotary plates 45, 45 and escapes. At this time, both rotating plates 45, 4
The guide body 5 held between the rollers 51 supports the connecting rope R and is stopped at a gravity position, and in this way, the two rotary plates 45, 45, their shafts, and the guide body 5 close the space. By holding the connecting rope R to prevent it from hanging,
This stabilizes the traction force by keeping the support line and the connecting rope R in parallel, and in particular stabilizes the movement of the carrier when the support line rising from the ground changes its angle with the support bracket of the steel tower. It can be done by

To lower the old line into the carrier, attach extension wire EW to both ends of the two old lines removed from the fixed yoke of the steel tower.
and connect tension wire KW and extension wire
The EW is lowered to the engine field and the drum field and held down by a reel winder, and the tension wire KW is lowered to the ground via a pulley on the steel tower, and the tension wire KW is gradually loosened to the wire receiving roller 8 of each carrier B. hold it upwards. When the old line has been held in the carrier group, the tension wire KW is removed, and the connecting rope R and the extension wire EW are simultaneously wound in the drum field in the opposite direction from when they were deployed. A steel tower support bracket HG is used to hold a group of carriers holding lines.
It is lowered to the ground across the road and the old line is retrieved from the carrier group. At this time, back tension is applied to the connecting rope R and the extension rope EW as necessary at the engine station.

Next, the empty carrier group at the drum station will hold two new lines, and an extension wire will be installed on the engine station side.
By winding up the EW and connecting rope R, it is deployed again into the extended wire span, and tension wires are placed at both ends of the new line.
Install the KW and pull it up to the fixed yoke. When pulling up this new line, the line receiving roller 8 of each carrier B
The upper lid 9 is rotatably supported by a spring with appropriate biasing force in both the inside and outside directions, and is opened by pushing up the new line from below. The above-mentioned old line conveyance and new line conveyance are repeated for two lines each to complete the multi-conductor line extension.

The order of the conductors in removing the old line and transporting the new line can be determined in many ways as long as the method does not disturb the weight balance of the multiple conductors, as shown in FIG. 6, for example.

In this example, the construction method was described for one span, but even for multi-span construction, the construction work can be completed by moving the group of carriages in parallel and arranging and transporting the new lines corresponding to each span length in sequence. This can be said to be a much more efficient construction method. In addition, when used not only for relining old and new lines, but also for extending new lines, there is no need for the step of removing old lines, and other construction methods are the same.

(Effects of the invention) As described above, replacing old multi-conductor power lines with UHV power lines using the construction method of the present invention not only minimizes damage to new lines that previously occurred, but also reduces the burden on workers on towers. This has the effect of preventing accidents such as falling and falling, and since two lines are extended at once, it improves work efficiency and also has economic effects such as extending multiple spans at once. It has many effects.

[Brief explanation of the drawing]

Fig. 1 is a procedure diagram of the construction method of the present invention, Fig. 2 is a front view of the support fitting, Fig. 3 is its right side view, Fig. 4 is a front view of the carrier, Fig. 5 is its right side view, Fig. 6 The figure shows the procedure for removing the old line and transporting the new line. Codes in the diagram: A...New line, C...Old line, HG...
...Supporting bracket, R...Connecting rope, 1...Mounting part,
2... Frame body, 3... Support line gripping part, 4... Windmill type metal wheel, 5... Guide body, 6... Pulley, 7... Connecting rope fixing part, 8... Line receiving roller, 9... …
Lid, B...carrier, EW...extension wire, KW...
...Tension wire, W...Support line, 21...Side side,
31... Clamp part, 32... Guide groove, 41...
... Fitting groove, 42 ... Side, 43 ... Sliding holding part, 4
5...Rotating plate, 51...Roller, 52...Brim.

Claims (1)

[Claims] 1. Two support lines and a connecting rope are extended from the drum field side to a position directly below the center of the old multi-conductor line in the wire span, and are lowered to the engine field side. The support wires of the strips are clamped by clamps at predetermined intervals, and the connecting rope is wound between the support wires by passing the connecting rope in a closed manner over the rollers of a guide body that can freely move between two rotary plates. a step of supporting the carrier that has arrived by pick-up with a support fitting that allows it to pass;
A stage in which the carriers connected at predetermined intervals are moved from the ground on the drum field side on the support line by winding the connecting rope, and is deployed across the support metal fittings to the extension span.The two old lines are removed and each Connect extension wires to both ends of the old line, and pull one end down to the winch at the engine station, and the other end to the drum at the drum station.
By operating the engine station and drum station, the old line was lowered and held onto each carrier, and the connecting rope and extension wire were wound up from the drum station side, and each carriage passed through the support fittings, and the old line was removed to the ground. Contrary to the removal stage, the two new lines held by each carrier on the ground are deployed across the track span and attached to the removed old line positions, and the following steps are repeated in the same manner a predetermined number of times. Method for relining multi-conductor power transmission lines.