JPH11355928A - Drawing method for electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the total weight of hung metal pulleys in a span, by temporarily lifting a rope to be a main string just after spread of nonreversal type hung metal pulleys, lowering the tension of an existing wire, connecting this existing wire to a wire to be strung newly, and drawing the wire to be newly strung simultaneously with removal of the existing wire. SOLUTION: A rope 13 as a main string fitted with metal fixtures 12 is prepared, and the rope 13, miniature metal pulleys 6, and X-type nonreversal hung metal pulleys 1 are spread over an existing wire 3. And instantly, the tension of the rope 13 is increased until the looseness of the rope 13 becomes equal with or smaller a little bit than that of an existing wire. And if it is stretched up, the tension of the existing wire 3 is lowered, and the rope 13 is connected to the terminal clamp of the existing wire 3 with a wire 15. Following this, a wire to be newly strung 7 is passed and drawn through the X-type hung metal pulley 1 and the miniature metal pulleys 6 simultaneously with pulling out of the existing wire 3. And that drawn newly-strung wire 7 and the rope 13 are changed over simultaneously with removal of the existing wire 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extension of an electric wire which is useful when an overhead transmission line is replaced by using a non-inverted type suspension wheel constructed by integrating a pair of suspension wheels in parallel. Concerning the provision of construction methods.

[0002] In the present invention, the "overhead transmission line" includes not only the main line of the overhead transmission line but also the ground line.

[0003]

2. Description of the Related Art When a main line or ground line of an overhead power transmission line is replaced, a suspension truck construction method is used for the purpose of simplifying the equipment by low-tensile wire drawing or preventing access to a live line. There are many. In particular, the non-reversing type suspension van construction method is a method that allows easy and reliable replacement of overhead power transmission lines and main cables.

Conventionally, a construction method using a non-reversing type suspension wheel in which a pair of suspension wheels are integrated in parallel so as to have a pair of frames and rollers arranged above and below each frame, particularly, In the case of replacing overhead transmission lines using an X-type hanging truck, which is called by its form, the work has been performed in the manner shown in FIG. First, the upper roller 2 in one frame of the plurality of X-type hanging wheels 1 fixed by the connecting rope 5 as described above.
Is put on the existing line 3, the pulling rope 4 is passed through the other frame of the X-type hanging wheel 1, and the pulling rope 4 and the connecting rope 5 are deployed together with the X-type hanging wheel 1 in the span. If the total weight of the X-type hanging wheel 1 becomes large and the deployment is not easy due to a long span or the like, the X-type hanging wheel 1 is expanded after first inserting several miniature wheels 6 and After reaching the steel tower, the wheel 6 collects it.

After the X-type hanging wheel and the rope have been deployed as described above, the new wire 7 is connected to the terminal of the pull rope 4 and the new wire 7 is extended by pulling the pull rope 4 as shown in FIG. . After that, the new line 7 is temporarily raised, the tension of the existing line 3 is lowered, the rope 8 is connected to the end of the existing line 3, and the existing line 3 is removed. Thus, the brake device 9 is attached to the end of the rope 8 (and the connecting rope), the rope 8 and the connecting rope 5 are pulled, the X-type hanging wheel 1 is removed, and finally, the new line 7 is defined as shown in FIG. The work is completed in close contact with the sag.

[0006]

According to the prior art described above; according to the wire drawing method shown in FIG. 4, when the X-type suspension wheel 1, which is a non-inverted suspension wheel, is deployed, the pull ropes 4 and X Since the connecting ropes 5 for fixing the type lifting wheel are simultaneously deployed, troubles such as the ropes 4 and 5 getting entangled easily occur, and the weight of the X type lifting wheel is relatively large. Effort was required during deployment. In addition, since the replacement work including the wire drawing method described above is a power outage work for one or all circuits, it is desired to reduce the time for the on-board work in order to stabilize the power supply. I was

Therefore, the problems to be solved by the present invention (objects)
Can be used to replace the overhead transmission line using a non-reversing suspension wheel, which can prevent the workability from becoming worse due to the connecting ropes between the suspension wheels connecting the towers, reducing the work labor and installing An object of the present invention is to provide an electric wire drawing method capable of shortening the working time.

[0008]

The wire drawing method provided by the present invention uses a non-reversing type suspension wheel having a pair of frames and rollers arranged above and below each frame, and is used for aerial feeding. When replacing the electric wire, place the roller on one frame of the non-reversing type suspension wheel on the existing line to deploy the non-reversing type suspension wheel, and also hang the rope of the required strength on the non-reversing type suspension wheel. Deployed into the span through the other frame of the wheel, temporarily raise this rope as the main rope, connect the new line to the end of the existing line, pull out the existing line and extend the new line at the same time It consists of a construction method.

According to the method of the present invention, the rope serving as the main rope is temporarily raised immediately after the non-reversing type suspension wheel is deployed to lower the tension of the existing line, and the existing line and the new line are connected to each other. Can be extended simultaneously with the removal of the new line.

[0010] In order to reduce the total weight of the suspension wheel during the span while maintaining the ease of the work of replacing the electric wire and the main cable,
It is desirable to replace one or more of the non-inverting type suspension wheels disposed on the span with the steel tower side with the mini-wheel, and attach the mini-wheel to the main rope and arrange it in the span.

[0011] In order to eliminate the connecting rope connecting the gold wheels,
One of the short ropes is attached to a non-inverted suspension wheel or mini wheel using a short rope, and the other of the short rope is fixed to a main rope, and the non-inverted suspension wheel or mini wheel is deployed in the span. Should be fixed to the main rope. In this case, it is preferable that the rope attached to the non-inverted suspension wheel is a plurality of ropes and is fixed to the main rope at two or more places on the left and right of the non-inverted suspension wheel. Also, the number of ropes attached to the mini wheel may be one or more. Further, it is preferable that a short rope is fixed to the main rope using a connection fitting having a structure rotatable around the main rope.

[0012]

1 to 3 show a preferred embodiment of the wire drawing method according to the present invention, and FIG. 1 shows a work procedure of wire replacement work including the wire drawing method. FIG.
Indicates a fixing state of a non-reversing type hanging wheel; an X-type hanging wheel or a mini wheel to a main rope, and FIG. 3 shows a fitting for fixing a short rope to the main rope.

Thus, the present embodiment is applied to the construction of an overhead ground line (single line power outage).
A rope 13 composed of a φ12 Kevlar rope (Kevlar is a trade name) to be a main rope is prepared as shown in FIG. The metal fittings 12 for fixing the hanging wheel are attached to the four hanging wheels. This mounting work is performed on the ground before the power outage period.

As shown in FIG. 3, the metal fitting 12 is provided with an inner cylinder 16 passing through and in contact with the main rope and a screw joint 18 connected to the inner cylinder 16 via a ball bearing 17. 2.5 cm long on both sides of inner cylinder 16
Was attached and fixed with vinyl tape. Therefore, the inner cylinder 16 can rotate relative to the screw joint 18 around the main rope, and also restrains the axial movement of the inner cylinder 16 on the main rope by the MID oil hoses 19 on both sides. Fixed. The screw joint 18 is for connecting a short rope 10 described later.

When the rope 13 as the main rope to which the metal fitting 12 is attached is prepared as described above, as shown in FIG. 6 and the X-type suspension wheel 1 that is a non-inverted suspension wheel is deployed on the existing line 3. At or before this deployment, as shown in FIG. 2, one end of the short rope 10 is fixed to the screw joint (18 in FIG. 3) of the metal fitting 12, and the other end of the short rope 10 is connected to the X-type hanging wheel. The X-shaped hanging wheel 1 or the wheel 6 is fixed at a predetermined position on the main rope. By doing this,
The X-type wheel 1 or the mini wheel 6 is deployed while being held at regular intervals with respect to the main rope 13.

As shown in FIG. 2A, two short ropes 10 are used for the X-type hanging wheel 1.
0 is attached to the X-type hanging wheel 1 and the short rope 10
The other end of the rope 13 on both sides of the X-type hanging wheel 1 as a main rope
With a metal fitting 12. On the other hand, as shown in FIG. 2B, one short rope 10 is attached to the mini wheel 6, one end of the short rope 10 is attached to the mini wheel 6, and the other end of the short rope 10 is mainly used. It is fixed to a rope 13 as a rope with a metal fitting 12.

As described above, when the rope 13 with the metal fittings, the X-shaped hanging wheel 1 and the mini wheel 6 are deployed on the existing line 3, the slack of the rope 13 is immediately changed to the sag of the existing line 3. By increasing the tension of the rope 13 until the tension is equal or slightly higher, and lowering the tension of the existing line 3 when the rope 13 is raised, the main rope is replaced with the existing line as shown in FIG. The rope 13 is stretched between the steel towers, and the existing line 3 is put on the lower roller 14 of the X-type hanging wheel.

Next, as shown in FIG. 1, the terminal clamp of the existing line 3 and the terminal clamp of the new line 4 are connected to a short wire 15.
Then, the existing line 3 is pulled out, and at the same time, the new line 7 is extended through the X-type hanging wheel 1 and the mini wheel 6.

Next, as shown in FIG. 1, the tension of the newly installed wire 7 is increased until the sag of the newly installed wire 7 becomes equal to the sag of the rope 13.
, And the new wire 7 and the rope 13 are replaced.

Next, as shown in FIG. 1, the brake device 9 is attached to the terminal of the loosened rope 13 and the brake device 9 is movably installed on the new line 7.
3 is pulled to collect the rope 13, the mini wheel 6 and the X-type hanging wheel 1.

Finally, as shown in FIG. 1, the new line 7 is pulled up to a specified sag, and the operation is completed.

According to this embodiment, the entanglement of the rope can be prevented by eliminating the connecting rope of the X-type hanging wheel 1, and the X-type hanging wheel 1 and the mini wheel 6 are combined. As a result, the weight at the time of deployment of the hanger car is reduced, the workability can be improved, and furthermore, the removal of the existing line and the extension of the new line can be performed at the same time, thereby shortening the on-board work time.

[0023]

According to the present invention as described above, when replacing overhead transmission lines using a non-reversing suspension wheel, workability is improved by connecting ropes between the suspension wheels connecting the towers. It is possible to achieve an intended task (object) of providing an electric wire drawing method which can prevent the deterioration and can reduce the work labor and the on-board work time.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an operation procedure of a rebuilding work including a wire drawing method according to an embodiment of the present invention.

FIGS. 2A and 2B are perspective explanatory views showing a state in which an X-type hanging wheel (non-reversing type hanging wheel) is fixed to a main rope in the embodiment of the present invention, and FIG. FIG. 2 is a perspective explanatory view showing a state in which a car is fixed to a main rope.

FIG. 3 shows an embodiment of the present invention, wherein (a) shows a fitting for fixing a short rope to a main rope, (a) is a front view,
(B) is a side view of the metal fitting.

FIG. 4 is an explanatory view showing, in a conventional example, an operation procedure of a rebuilding work including a wire drawing method of an electric wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X type hanging wheel (non-reversing hanging wheel) 2 Upper roller 3 Existing line 6 Mini wheel 7 New line 9 Brake device 10 Short rope 12 Fixing bracket (for fixing short rope) 13 Rope (main rope) 14 Lower roller 15 Wire rope 16 Inner cylinder of fixing bracket 17 Ball bearing 18 Screw joint 19 MID oil hose

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshiaki Sugawara 3-5-10 Higashishinagawa, Shinagawa-ku, Tokyo Hitachi Cable Power Systems, Ltd. (72) Inventor Motonori Shinohara 4-1-1 Kawajiri-cho, Hitachi City, Ibaraki Prefecture No. Within the Toura Plant of Hitachi Cable, Ltd.

Claims (5)

[Claims] The present invention relates to a non-reversing type suspension wheel for replacing overhead transmission lines by using a non-reversing type suspension wheel having a pair of frames and rollers arranged above and below each frame. The roller of one frame portion is placed on the existing line to deploy the non-reversing type suspension wheel, and the rope of the required strength is deployed in the span through the other frame portion of the non-reversing type suspension wheel. After temporarily raising the rope as the main rope, connect the new line to the end of the existing line,
An extension method for electric wires, in which an existing line is pulled out and a new line is extended at the same time. 2. A non-inverting type suspension wheel arranged in a span, at least one of which is located on a steel tower side is replaced with a mini wheel, and the mini wheel is mounted on a main rope and arranged in the span. Item 6. A wire drawing method according to Item 1. 3. One of a plurality of short ropes is attached to a non-reversing type suspension wheel, and the other of the short ropes is fixed to a main rope at two or more places on the left and right sides of the non-reversing type suspension wheel. The wire drawing method according to claim 1, wherein the developed non-inverted suspension wheel is fixed to the main rope. 4. The wire drawing method according to claim 1, wherein one of the one or more short ropes is attached to a miniature wheel, and the other of the short ropes is fixed to a main rope. 5. The wire drawing method according to claim 3, wherein the short rope is fixed to the main cable by using a connection fitting having a structure rotatable about the main cable.