JPS6217926B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is designed to prevent the wires from loosening and coming into contact with obstacles on the ground and causing accidents when new or replacing overhead power transmission lines. This invention relates to an overhead line construction method using a hanging wheel that extends the line while suspending it.

When replacing the old line stretched between steel towers with a new line, if we use the so-called pull-out method, in which the new line is connected to one end of the old line and pulled out from the other end, a large amount of slack will occur. It is necessary to use a large winch with a driving force that exceeds the back tension while applying a certain amount of back tension, and even then, it is necessary to take measures to prevent interference with obstacles on the ground due to the slack that occurs.

In order to solve this problem, a conventional overhead line construction method has been proposed in which a large number of small hanging wheels are used. Conventional overhead line construction methods of this type include those shown in FIGS. 1 and 2, for example. Figure 1 shows the hanging wheel used for this overhead line work. 1 is a hanging wheel, two wheels 2, 3, two insertion holes 4, 5, and a towing rope 6.
It is provided with a holding part 7 for use. Figure 2 shows old line A and new line B
This shows the overhead line construction method when replacing the old line A. First, a self-propelled machine 8 is run on the old line A, and while extending the messenger wire 9, a plurality of hanging cars 1, 1... are towed by the rope 10. It will be developed sequentially [Figure 2 B]. Next, the messenger wire 9 is rolled up from the side of the steel tower 11, and the new line B connected to it is extended [Fig. 2 B]. When the new line B has been extended between the steel towers 11 and 12, a so-called tension conversion is performed to loosen the old line A and tension the new line B. and the new line B [Figure 2 C]. After that, the old line A is pulled out and the hanging wheels 1, 1, . . . are recovered.

However, in the conventional overhead line construction method using a hanging wheel, the positions of the old line A and the new line B are directly changed, so a step of turning the hanging wheel 1 upside down is essential. There was a problem with this. That is, in the case where the hanging wheel 1 is reversed in this way, in the unlikely event that the reversing direction of each of the multiple hanging wheels 1, 1... arranged between the steel towers 11, 12 is not unified,
The old line A and the new line B, as well as the towing ropes 6, become entangled with each other, requiring a great deal of effort to untangle them, and in doing so, the new line B will be damaged. Therefore, when changing the position, not only must the reversal direction be unified, but also the hanging wheel 1 and each line A,
Great care and much effort was required to prevent B and 6 from shockingly colliding with each other.

However, in consideration of overhead line work in areas such as mountainous areas where it is difficult to secure a work area on both sides between steel towers, a method for overhead line work has been developed in which the new line side is turned back in a loop (especially when (Kokai No. 53-99491), the same problem remained because the technical idea of flipping the hanging wheel upside down in order to change the position between the old line and the new line remained the same.

This invention was made by focusing on the problems of the conventional overhead line construction method using a hanging wheel. The purpose of this project is to provide a method for overhead line construction using a rational hanging wheel that can be used not only for replacement work but also for new construction.

The present invention will be explained below based on illustrated embodiments. 3 to 6 show an embodiment of the present invention. Figure 3 shows the hanging wheel used in this method.
This hanging wheel 20 has one wheel 22 at the upper part and two wheels 23, 24 at the lower part, and the uppermost and lowest parts of a frame 21, which has a generally triangular shape as a whole, supports the wheels 22, 23, 24. A rod-shaped wire guide body 25 connects the two. An eye ring 26 is movably mounted on the wire guide body 25, and the main rope wire 28 can be moved along the wire guide body 25 via a support 27. In this embodiment, two lower wheels 23 and 24 are provided to prevent rotation in the horizontal plane, but the lower wheels are not necessarily two in the hanging wheel used in this invention. do not need.

The overhead line work according to the present invention is carried out as follows using the above-mentioned hanging wheel. For convenience, we will explain the construction work involved when replacing the old line with the new line.

First, the hanging wheel 20 is suspended on the old line A via the upper wheel 22, the main rope wire 28 is supported by the support body 27 provided on the eye ring 26, and the main rope wire 28 is towed. A plurality of the suspended metal wheels 20 are sequentially deployed at appropriate intervals [FIG. 4A]. It should be noted that the easiest method for this towing is to use the self-propelled machine 8 directly as shown in Figure 4A, but
When the self-propelled machine 8 does not have sufficient capacity to tow a large number of hanging wheels 20, 20, etc., it is preferable to perform the process shown in FIG. 5, for example, prior to towing the hanging wheels 20, 20... . That is, first, a single lightweight hanging wheel 29 is deployed on the self-propelled machine 8 via a lightweight thin rope 30 [Fig. 5 B], and then this thin rope 30 is replaced with a stronger rope 31 [Fig. 5 B]. ], from behind this strong rope 31, the hanging wheels 20, 20... in FIG.
(Figure 5 C).

In this way, the hanging wheels 20, 20 are placed on the steel towers 11, 12...
When the development of the new line B is completed, the new line B is connected to the rear end of the old line A. This connection was originally made using a hanging wheel 20, 20.
It may be done in advance before the development of... [4th
Figure B].

Thereafter, the main rope wire 28 is tensioned with the hanging wheels 20, 20, .
Relax the old line A while moving upwards. As a result, the old line is suspended on the lower wheels 23, 24 (FIG. 4C).

Then, the old line A is pulled out while being suspended on the lower wheels 23 and 24, and the new line B is extended from the rear end thereof [Fig. 4 D].

After the extension of the new line B is completed, the new line B is tensed, the main rope wire 28 is relaxed, and the eye ring 26 and the hanging wheel 2 are moved along the wire guide body 25 again.
0, and finally, the main rope wire 28 is towed to retrieve the hanging wheel 20 while moving it on the new line B [FIG. 4E].

In this way, since the position change between the main cable wire 28 and the old and new wires B and A is performed along the wire guide body 25 by changing the tension, the hanging wheel 20 does not need to be reversed; The lines will not collide with each other.

In addition, although the case where the old line A is replaced with the new line B has been explained above, the present invention can also be used in new construction work. In other words, in the case of new construction work, a lightweight rope is passed between the towers using a helicopter or a radio model airplane, and this is replaced with messenger wire of appropriate strength, just as in so-called normal line extension work. After that, if this "messenger wire" is treated in the same way as the "old line" described above, the above explanation can be applied as is.

In addition, this method can be used to replace old and new wires when multiple phase wires such as upper phase 35, middle phase 36, and lower phase 37 are stretched between the same steel towers 11 and 12, or to replace such multiple phase wires. It can also be rationally applied to new construction.

In other words, in the case of replacing old and new lines, ropes 38, 38...
A similar construction method may be carried out by connecting the hanging wheels 20, 20, . In the case of new installation, first install the upper phase wire (not shown), and then deploy the wire for each phase other than the upper phase by connecting the hanging wheels for each phase in multiple stages. When doing so, they may be deployed together while being suspended from each lower wheel.

In addition, since this invention allows the new line to follow the old line, it is possible to omit the work of changing the position of the main rope wire by changing the tension for everything other than the upper phase, whether in the case of replacement or new installation. . Therefore, the greater the number of phases, the greater the application effect of this invention.

As explained above, according to the present invention, since the structure described in the claims is adopted, the new line is connected to the old line or messenger wire between the upper and lower wheels of the hanging wheel, regardless of whether it is replaced or newly installed. Since only the most basic work of following and tensioning is performed later, there is no possibility of scratches or the like occurring. In addition, since the main rope wire is moved along the wire guide body, there is no contact or interference between the wires, and there is no need to turn over many heavy hanging wheels, making the work easier and safer. . As a matter of course, there are advantages specific to the overhead line construction method using hanging wheels, namely, there is less slack during extension, there is no interference with obstacles on the ground, and there is less back tension, which makes it easier to pull with a winch. This also has the effect of requiring less driving force.

As shown in the detailed description, this invention can be easily applied to the replacement of old and new lines when multiple phase lines are stretched between the same steel towers, and the construction of new transmission lines. Moreover, since the new line is extended from behind the old line or messenger wire, it is possible to omit the step of changing the position of the main rope wire for other than the upper phase.

[Brief explanation of the drawing]

Figure 1 A and B show an example of a hanging wheel used in the conventional overhead line construction method. Explanatory diagram showing a conventional example of the overhead line construction method, Figure 3 A and B show an example of a hanging wheel used in the overhead line construction method of the present invention. Figures 4A to 4E are explanatory diagrams showing one embodiment of the present invention, Figures 5A to 5C are explanatory diagrams showing an example of a construction method that can be used in the preceding stage of Figure 4A, and Figure 6 The figure is an explanatory diagram showing an example in which the present invention is applied to replacement work for old lines arranged in multiple stages above and below. DESCRIPTION OF SYMBOLS 11, 12... Steel tower, 20... Hanging wheel, 21... Frame, 22... Upper wheel, 23, 24... Lower wheel, 25... Wire guide body, 26... Eye ring,
28... Main cable wire, A... old line (messenger wire), B... new line.

Claims (1)

[Scope of Claims] 1. A hanging wheel, which has wheels on its upper and lower parts and which connects the uppermost and lowermost parts of a frame that supports the wheels with a wire guide body, is connected to an old wire or a messenger wheel via the upper wheel. With the main rope wire suspended on the wire and supported by an eye ring movably attached to the wire guide body, the suspended hanging wheel is successively moved at appropriate intervals by pulling the main rope wire. Deploy multiple lines between towers, connect the new line to the rear end of the old line or messenger wire, tension the main rope wire while leaving the hanging wheel as is,
While moving the main rope wire together with the eye ring along the wire guide body to the upper part of the hanging wheel, the old line or messenger wire is relaxed and suspended on the lower wheel, and the old line or messenger wire is suspended on the lower wheel. While pulling out the new line, the new line is extended, then the new line is tightened, the main rope wire is relaxed, and the eye ring is moved along the wire guide body to the lower part of the hoist car, and the hoist car is raised. An overhead line construction method using a hanging wheel, which is characterized in that the main rope wire is towed and recovered while being moved on a new line.