JPH0456526B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a jumper device for overhead power transmission lines that connects main lines held on a steel tower, and in particular, a jumper device for connecting main lines held on a steel tower, and in particular, a jumper device that connects a rigid pipe extending in a substantially horizontal direction and a rigid pipe extending below a steel tower arm. The present invention relates to a jumper device for an overhead power transmission line, which is equipped with a hanging material that is suspended and supported.

(Prior Art and its Problems) Conventionally, as shown in FIG. 1, this type of jumper device has a rigid pipe 2 made of aluminum or the like extending in a substantially horizontal direction below a steel tower arm 1.
The upper end of this is connected to metal fittings provided between the insulator chains 3 and 4 and the main lines 5 and 6, respectively, such as yokes 7 and 8, and the lower end is connected to metal fittings 18 and 19 provided respectively at both ends of the rigid pipe 2. Connecting hanging materials 9 and 10
Connecting conductors 11 and 12 connected to both ends of the rigid pipe 2 are connected to the main lines 5 and 6.
A so-called pipe jumper type in which the connecting conductors 11 and 12 are connected to each other, and a so-called suspended type in which the connecting conductors 11 and 12 are connected to each other and the intermediate part thereof is attached and supported by the rigid pipe 2 are known. There is.

In jumper equipment equipped with this type of rigid pipe, when the power transmission capacity exceeds 500KV or when it is installed in a coastal area with a lot of salt damage, the insulator chain becomes very long, so the rigid pipe 2 is also required. Long lengths, for example 15m or more, may be required. Long rigid pipes pose problems in handling and transporting them, and in particular, construction work for power transmission lines often requires the use of narrow roads to transport materials; transporting rigid pipes becomes virtually impossible.

Usually, in such cases,
As shown in the publication, a long rigid pipe is divided into two at the center to form two short pipe units of equal length, which are connected with bolts or the like.

However, when a rigid pipe in which pipe units of equal length are connected as described above is suspended and supported via hanging materials, the connection point is arranged at the center between the hanging materials.

On the other hand, the bending moment due to the weight of a rigid pipe that is suspended (supported at two points) is greatest at its center. In other words, the connection point of the rigid pipe will be located at the point of maximum bending moment. Therefore, the said rigid pipe may cause damage at the connection point after many years of use.

(Means for Solving the Problems) The present invention improves these drawbacks, and even if the rigid pipes are connected with two short pipe units to make the pipe longer, the bending moment applied to the connection point can be reduced. It is an object of the present invention to provide a jumper device for an overhead power transmission line that can be used stably for a long period of time.

In order to achieve the above object, the present invention is constructed as follows.

That is, the present invention provides a jumper device for an overhead power transmission line that includes a rigid pipe formed by connecting two pipe units extending substantially horizontally, and a hanging member that suspends and supports the rigid pipe below a steel tower arm. 2
This pipe unit has different lengths, and is characterized in that the connection point is located between the hanging members and at a location other than the center between the hanging members.

(Example) Next, the present invention will be explained in detail based on an example illustrated in FIG.

The figure shows the present invention applied to the overhead power transmission line jumper device shown in FIG. 1, and the same constituent parts as those in FIG. 1 are not shown and omitted.

In the figure, 2 indicates a rigid pipe made entirely of a metal pipe, for example an aluminum pipe.

This rigid pipe 2 consists of two pipe units 1
3 and 14 are connected via a flange 15. One pipe unit 13 and the other pipe unit 14 have different lengths. For example, one pipe unit 13 is 5 m long, and the other pipe unit 14 is 10 m long.

This connection work of pipe units 13 and 14 is performed on site.

Rigid pipe 2 connected to a predetermined length in this way
As in the conventional case, a rigid pipe 2 is suspended and supported by hanging members 9 and 10 below the steel tower arm 1 so as to extend in a substantially horizontal direction. The suspended and supported rigid pipe 2 has its flange 15, in other words, the connection point located outside the center between the hanging members 9 and 10. That is, the lengths of l ₁ and l ₂ are different.

Thereafter, the rigid pipe 2 is connected to the main lines 5 and 6 via the connecting conductors 11 and 12.

In this embodiment, the connection structure between the two pipe units is a flange connection, but the connection structure between the two pipe units can be any structure.For example, as shown in FIG. Connecting fittings 16 and 17, each of which has one end cut in half, are connected to the ends of the main pipe units 13 and 14 to be connected by welding or the like, and these are arranged so that the half pieces overlap each other. The parts may also be bolted or sleeved together.

Further, the present invention can be applied to a suspended type jumper device in which the connecting conductors 11 and 12 are made continuous, and the intermediate portion thereof is attached and supported by a rigid pipe.

(Effects of the Invention) According to the present invention, an aerial transport system comprising a rigid pipe formed by connecting two pipe units extending substantially horizontally, and a hanging material that suspends and supports the rigid pipe below the tower arm. In the electric wire jumper device, the two pipe units have different lengths, and their connection points are located outside the center between the hanging members, so that the following effects are achieved.

That is, since the two pipe units have different lengths and the connection point is located outside the center between the hanging members, the connection point is outside the maximum bending moment due to the weight of the rigid pipe. Therefore, the bending moment that the connection part receives is much smaller than that of conventional products, and it can be used stably for a long period of time. In particular, in the present invention, since the lengths of the two pipe units are made different, the connecting portion can be easily located at a location other than the center between the hanging materials by simply connecting the two pipe units. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional jumper device for overhead power transmission lines, Fig. 2 is a front view of essential parts showing one embodiment of the jumper device for overhead power transmission lines of the present invention, and Fig. 3 explains another embodiment. FIG. 1 is the steel tower arm, 2 is the rigid pipe, 3, 4 is the insulator chain, 5, 6 is the main line, 7, 8 is the yoke, 9, 10
11 and 12 are connecting conductors, 13 and 14 are pipe units, 15 is a flange, 16 and 17 are connection fittings, and 18 and 19 are metal fittings.

Claims (1)

[Claims] 1. In an overhead power transmission line jumper device comprising a rigid pipe formed by connecting two pipe units extending substantially horizontally, and a hanging material that suspends and supports the rigid pipe below a steel tower arm, the two pipe units have different lengths, and the connection point is located at a location other than the center between the hanging members.