JPS6115505A - Method of extending aerial transmission line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of extending a pilot wire using a model airship and then using the pilot wire to extend an overhead power transmission line between steel towers.

[Technical background of the invention and its problems] Generally, during the extension work of overhead power transmission lines (including overhead ground lines), the extension ropes and wires that are being extended may sag and come close to or come into contact with crossing structures. To prevent this, protective scaffolding is being constructed between steel towers.

Furthermore, when it is difficult to construct protective scaffolding due to the topography and site conditions of the construction site, a so-called scaffold-less line extension method is also used, in which the line is extended without constructing protective scaffolding.

This method of extending wire without scaffolding involves suspending the wires to be extended from existing wires using hanging wheels at appropriate intervals along the span, and by apparently shortening the length of the upper span. This is a wire drawing method that secures the distance between the wire and the crossing work by reducing the slack without increasing the wire tension.

By the way, this construction method is similar to re-covering existing lines, etc.
This method can be applied when there is an existing power line or ground wire on which the hanging fitting can be hung, but it has the disadvantage that it cannot be applied when a new installation is being made.

[Object of the Invention] The present invention has been made to solve these conventional difficulties, and provides a method for extending overhead power transmission lines that does not require the construction of protective scaffolding and can be applied even when there are no existing electric wires. The purpose is to

[Summary of the Invention] That is, the overhead power transmission line extension method of the present invention involves extending a pilot wire from one steel tower to the other tower using a flying object, and then using this pilot wire to extend the overhead power transmission line as described above. In the method of extending wire between steel towers, a balloon having a wire guide section is moored between the steel towers, and the pilot wire is guided by the wire guide section of the balloon to maintain the pilot wire at a predetermined altitude. It is characterized by extending the wire.

[Embodiment of the Invention] The details of the present invention will be described below with reference to an embodiment shown in the drawings.

1 and 2 show a method of extending an overhead power transmission line according to the present invention, and in the figures, reference numeral 1 indicates a model flight 1. FIG.

This model airship 1 is propelled and flies by radio control, and a pilot wire 2 is connected to its bottom.

This pilot wire 2 is made of strong pumice stone such as nylon wire, and is longer than the distance between the steel towers 3a and 3b. It is wound around the installed delivery reel 4.

In addition, the model airship 1 is equipped with an operating wire 5 wound around a reel (not shown) or wound into a shape, and the operating wire 5 has a weight made of an iron piece at one end. 6 is fixed.

This weight 6 is magnetically fixed to an electromagnet 7 provided on the model airship 1 and capable of being demagnetized by radio control.

In this embodiment, a balloon 8 is previously moored between the steel towers 3a and 3b via a locking wire 9 that is anchored to the ground, and a pilot wire 2 is guided to the locking wire 9 of the balloon 8. The guide fitting 9a connects the pilot wire 2 to the steel tower 3a.
, 3b, for example, at a predetermined height higher than that height so as not to contact the existing construction.

The method for extending an overhead power transmission line according to the present invention configured as described above is carried out, for example, as described below.

That is, in this embodiment, first, the starting end of the pilot wire 2 wound around the sending reel 4 installed on the ground is connected to the model airship 1 via the guide roller 4a,
This model airship 1 is flown by radio control from one steel tower 3a to the other steel tower 3b.

At this time, while floating the balloon 8 connected to the locking wire 9 between the steel towers 3a and 13b at a predetermined interval, the locking wire 9
The pilot wire 2 is guided by a guide fitting 9a provided at the steel towers 3a and 3b, and the pilot wire 2 is extended while maintaining a predetermined altitude higher than the height of the steel towers 3a and 3b so as not to contact the existing structure.

Thereafter, when the model airship 1 reaches above the steel tower 3b, the magnetic force of the electromagnet 7 of the model airship 1 is demagnetized by radio control, the weight 6 is released, and the operating wire 5 is lowered to the upper part of the steel tower 3b.

Next, the pilot wire 2 is guided by the guide fitting 9a.
The pilot wire 2 is extended between the steel towers 3a and 3b by pulling the operating wire 5 while winding it up on the steel tower 3a side to lower the model airship 1. Thereafter, the overhead power transmission line is extended using the pilot wire 2 in a conventional manner.

In addition, in the above embodiment, the pilot wire 2 is connected to the steel tower 3.
An example has been described in which the wire is wound on the delivery reel 4 via the guide roller 4a at the upper part of the a, and the starting end is connected to the model airship 1 to extend the wire. Wrap the pilot wire 2 around the lever reel,
Of course, the starting end may be anchored on the ground, for example, and the line may be extended via the guide rollers 4a.

In the embodiments described above, the balloon 8 is moored in advance via a locking wire 9 that is anchored to the ground, and the pilot wire 2 is guided and extended by the guide fitting 9a of the locking wire 9. However, the moored balloon 8 may be released from the model airship 1 that is being extended and moored on the ground.

That is, FIG. 3 shows another embodiment of the present invention,
Components common to FIG. 1 and FIG. 2 are given the same reference numerals.

The model airship 1 used in this embodiment has a locking rod 1a protruding from its tail, and the starting end of a pilot wire 2 is fixed to the tip of the locking rod 1a.

This locking rod 1a has a balloon 8 on the top and a locking wire 9.
The shaft hole of a reel 10 on which a piece of iron is wound and a piece of iron 10a is fixed to the end face is inserted through the shaft hole of the reel 10, and a weight 11 made of a piece of iron is fixed to one end of the locking wire 9.

The iron piece 10a on the end face of the reel 10 and the weight 11 are magnetically fixed to electromagnets 12 and 13 provided at the tail of the model airship 1 and which can be demagnetized by wireless operation.

In this embodiment configured as described above, wire extension is performed, for example, as described below.

That is, first, the pilot wire 2 fixed to the locking rod 1a of the model airship 1 is flown from the steel tower 3a to the steel tower 3b.

At this time, the model airship is guided by radio control so that the pilot wire 2 is guided from the locking rod 1a to the pilot wire 2 side with a predetermined interval between the steel towers 3a and 3b.
Reel 1 with balloon 8 by demagnetizing the electromagnet 12.13 of
0 is released, and the locking wire 9 wound around this reel 10 is lowered and locked on the ground.

After that, when the model airship 1 reaches above the steel tower 3b, the electromagnet 7 is demagnetized by radio control from the model airship 1, and the operating wire 5 is lowered to the upper part of the steel tower 3b, as described below in FIGS. 1 and 2. The steel tower 3a was constructed in the same manner as in the embodiment
, 3b, and the pilot wire 2 is used to extend an overhead power transmission line.

In the above explanation, an example was explained in which one set of reels equipped with balloons was used, but multiple sets of reels equipped with balloons were moored at multiple locations between the towers, and the pilot wire was guided to extend the line. You may.

Further, in each of the above embodiments, an example in which the present invention is applied to the extension of an overhead power transmission line has been described, but it can be similarly applied to the extension of an overhead ground wire.

[Effect of the invention] As explained above, the overhead power transmission line extension method of the present invention has the following effects:
The pilot wire is extended while maintaining a predetermined altitude using a model airship and balloon, so the pilot wire does not hang down and come close to or come into contact with the crossing structure between the towers, and when there are no existing power lines or ground wires. However, this pilot wire can be used to carry out extension work for overhead power transmission lines and overhead ground wires without constructing protective scaffolding.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing a method for extending an overhead power transmission line according to one embodiment of the present invention, and FIG. 3 is an explanatory diagram showing a method for extending an overhead power transmission line according to another embodiment of the present invention. It is. 1...Model airship 2...
・・・・・・・・・・・・Pilot wire 3a, 3
b... Steel tower 8... Balloon 9...
......Locking wire 9a...
...Guide fitting 10...Reel agent Patent attorney Sa Suyama - (1 other person)

Claims (2)

[Claims] (1) In a construction method in which a pilot wire is extended from one steel tower to another using a flying object, and then this pilot wire is used to extend an overhead power transmission line between the steel towers, the wire is guided between the steel towers. An overhead power transmission line extension method characterized in that a balloon having a section is moored, and the pilot wire is guided by a wire guide section of the balloon to maintain the pilot wire at a predetermined altitude while extending the pilot wire. Line construction method. (2) The method for extending an overhead power transmission line according to claim 1, wherein a balloon moored between the steel towers is released from a flying object that is being extended between the steel towers and moored to the ground.