JPS6362966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a power line tensioning method, and more particularly to a power transmission line tensioning method.

Prior Art When the work of extending the power transmission line to the power transmission tower T, etc. is completed, tension work is performed to apply the necessary tension to the power transmission line. Conventionally, this wire tensioning work has been carried out using a wedge-type come-along 2 to connect the power transmission line 21 and wire 22 that have been pulled close to the transmission tower T, as shown in Figure 1.
3, a movable pulley 24 is attached to the tip of the wire 22, and a fixed pulley 26 attached to the tip of an insulator 25 extending from the power transmission tower T is wound around the movable pulley 24 in multiple layers. wire 2
7 was guided downward via a fixed pulley 28 attached above the transmission tower T, changed direction by a metal wheel 29, and then wound onto a winch 30 installed on the ground. Then, the tension wire 27 is wound around the winch 30, and after the power transmission line 21 reaches the required tension, the dimensions of the power transmission line 21 are measured and cut, and the tip of the power transmission line 21 is pinned against the insulator 25. It was attached by hammering.

Furthermore, once the tensioning work is finished, the distance between the fixed pulley 26 at the tip of the insulator 25 and the movable pulley 24 facing the identification pulley 26 narrows, and when the next tensioning work is started, the distance between the two pulleys 24 and 26 becomes smaller. It was necessary to widen the gap again and rewind the tension wire 27.

However, in recent years, power transmission towers T are usually 80 to 100 meters long.
In order to reach the height of
It started to take a lot of effort to put it on.

Furthermore, in order to rewind the tensioning wire 27, it is necessary to send the tensioning wire 27 upward from the winch 30 via the metal wheel 29, and the winch 30 must be moved in the opposite direction to the direction used during tensioning work. It has been impossible to unwind the tension wire 27 just by rotating it. Therefore, it was necessary to input the tension wire 27 between the metal wheel 29 and the fixed pulley 28 and pull it up while rewinding it, and the rewinding operation required a great deal of labor and was extremely complicated.

In addition, the distance between both pulleys 24 and 26 is 10 m before tension work and 0 m after work, and the tension wire 2
7 is wound four times around both pulleys 24 and 26, the length of the tension wire 27 required for unwinding reaches approximately 80 m. In addition, a tension wire with a diameter of 12 mm and a length of 100 m weighs 41 kg, and a wire with a diameter of 16 mm and a length of 100 m weighs 98 kg. Therefore, when there is a large distance between the pulleys 24 and 26, it is virtually impossible to unwind the tension wire 27 on the unstable power transmission tower T.

Purpose of the Invention This invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the need for a lot of labor when performing tensioning work on power transmission lines after line extension work. First, it is an object of the present invention to provide a wire tensioning method that allows the wire tensioning wire to be easily rewound when the wire tensioning work is completed and the wire tensioning work is moved on to the next wire tensioning work.

Structure of the Invention In order to achieve the above-mentioned object, the present invention is such that a workbench on which a take-up winch is installed is temporarily installed on the top of a power transmission tower.

Embodiment An embodiment embodying the present invention will be described below with reference to FIG.

1 is a box-shaped workbench temporarily installed at the top of the power transmission tower T, and 2 is a winding winch firmly installed in the workbench 1. Note that the workbench 1 is transported by a helicopter and attached to the top of the power transmission tower T with the winch 2 installed in advance.

Reference numeral 3 denotes a tension wire extending from the winch 2, which is guided downward by a guide wheel 4 installed in the workbench 1, and then passed through a wire wheel 5 installed at the bottom of the power transmission tower T, and then moved almost horizontally. It extends in the direction and is wrapped around the movable pulley 6. The jumper wheel 5 has a diameter that is 10 times or more the diameter of the tension wire 3,
Those with sufficient strength for the working load are used. Reference numeral 7 denotes a fixed pulley disposed opposite to the co-moving pulley 6, and the tension wire 3 is wound around the pulleys 6 and 7 in multiple layers. The fixed pulley 7 is connected to the tip of an insulator 8 attached to one tip of the lower arm A of the power transmission tower T.

Reference numeral 9 denotes a wire attached to the movable pulley 6, and is connected to a power transmission line 11 by a wedge-type come-along 10. The power transmission line 11 has been stretched using a wire extension vehicle or the like, and a loose portion 11a at the tip thereof projects from the come-along 10 toward the movable pulley 6 and is temporarily fastened to the insulator 8. In addition,
A counterweight 12 is suspended from a wire 9 between the come-along 10 and the movable pulley 6.

Now, the operation of the tension device configured as described above will be explained below.

When the winch 2 is rotated in the workbench 1 on the power transmission tower T and the tension wire 3 is wound around the winch 2, the tension wire 3 is attached to the power transmission tower between the guide wheel 4 and the jumper wheel 5. It is pulled toward the top of T, and between the jumper wheel and moving pulley 6, it is pulled toward the jumper wheel 5. If the winch 2 continues to rotate and the tension wire 3 is pulled, the tension wire 3 stretched between the movable pulley 6 and the fixed pulley 7 will be under strong tension, and the movable pulley 6 will be pulled. approaches fixed pulley 7. Therefore, as the movable pulley 6 moves, the wire 9 and the come-along 10 are attached to the movable pulley 6.
Since the power transmission line 11 connected via is also pulled in the direction of the fixed pulley 7, sufficient tension is applied to the power transmission line 11 as well.

When the tension applied to the power transmission line 11 reaches a predetermined value,
After cutting the loose portion 11a of the power transmission line 11 leaving only the necessary length, the loose portion 11a is fixed to the tip of the insulator 8 by pinning or the like. After this, connect both pulleys 6, 7, wire 9, and come-along 10 to power line 1.
1 and insulator 8, the wiring work for the power transmission line 11 is completed.

When the tensioning work of the power transmission line 11 is completed as described above, the winch 2 is rotated in the opposite direction to that during the tensioning work. Then, the tension wire 3 is connected to the guide car 4.
Since it descends due to its own weight between the jumper wheel 5 and the movable pulley 6, the tension wire 3 becomes slack between the jumper wheel 5 and the movable pulley 6. Thereafter, by moving the movable pulley 6 by hand to return the movable pulley 6 to the position before the tensioning work, the distance between the two pulleys 6 and 7 returns to the distance before the work. After this, as shown by the two-dot chain line in Fig. 2, when performing the next tensioning work, the tensioning wire 3 can be wired to another jumper wheel 5a attached below the transmission tower T. There is no need to adjust the distance between pulleys 6 and 7, and the fixed pulley 7
may be attached to the tip of the insulator 8a. Therefore,
Very little effort is required when moving to the next line tensioning operation.

Effects of the Invention As detailed above, the present invention provides a workbench equipped with a take-up winch that is temporarily installed on the top of a power transmission tower, thereby making it possible to perform tensioning work on power transmission lines after wire extension work. It does not require much effort to heat,
Furthermore, when the tensioning work is completed and the next tensioning work is to be started, it is possible to easily unwind the tensioning wire, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a conventional example, and FIG. 2 is a schematic diagram showing an embodiment of the present invention. Workbench...1, Winding winch...2, Tension wire...3, Power line...11, Power transmission tower...
T.

Claims (1)

[Scope of Claims] 1. In a tensioning method for tensioning a power transmission line 11 to a power transmission tower T by winding the tensioning wire 3 around a winding winch 2, the winding winch 2 is installed. A wire tensioning method characterized by temporarily installing a workbench 1 on the top of a power transmission tower T. 2 A fixed pulley 7 facing the movable pulley 6 is attached to the tip of the insulator 8 attached to the tip of the arm A of the power transmission tower T, and the movable pulley 6 is placed close to the fixed pulley 7 between both pulleys 6 and 7. Strand wire 3 for
2. The tensioning method according to claim 1, wherein 3 The tension wire 3 is guided below the power transmission tower T by a guide car 4 installed on the workbench 1,
In addition, a metal wheel 5 installed below the transmission tower T
2. The wire tensioning method according to claim 1, wherein the wire tensioning method is carried out by winding the wire around a movable pulley 6 and a fixed pulley 7 through the following steps.