JPH028498Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a horizontal suspension member for a jumper device.

Jumper devices for overhead power transmission lines are generally constructed by measuring the same type of wire as the main line on-site, cutting it to the required dimensions, and crimping a jumper socket to the end of the wire.

In recent years, prefabricated jumper devices as shown in FIG. 1 have been proposed with the aim of reducing construction costs and improving safety during construction. This is a prefabricated horizontal member 1 made of a rigid material.
It has a jumper drawer part 2 at its end that accommodates changes in the catenary angle of the electric wire 10 and the insulator chain 11 and provides a margin for installation work. By suspending and fixing the jumper part, it is possible to effectively prevent a reduction in clearance due to lateral shaking or sagging of the jumper part. According to such prefabricated jumper equipment, the horizontal angle and catenary angle of each tower are measured in advance, the dimensions are manufactured to match the measurements at the factory, and the equipment is transported to the site and simply installed using bolts, etc. Because it is good, it has many advantages, such as a significant reduction in on-site work and improved reliability because it is manufactured in a factory. In addition, in FIG. 1, 12 is a retaining clamp.

By the way, in order to cope with the recent electricity situation, overhead power transmission lines have been increasing in capacity.
As the wire diameters and wire bundles of electric wires have become larger, the prefabricated jumper devices have also gradually become larger. For this reason, the wind pressure on the jumper device inevitably increases, which is a factor that particularly increases the vibration of the horizontal hanging member 1 due to the wind pressure. Therefore, in order to reduce such vibrations, the supporting device for the horizontal hanging member has become complicated and large-scale, which is causing a vicious cycle in which the entire device is further enlarged.

In view of the above-mentioned circumstances, the present invention aims to provide a horizontal suspension member for a jumper device that reduces the vibration generated in the horizontal suspension member and enables the entire device to be made smaller and simpler. be.
For examples of horizontal suspension materials aimed at increasing vibration absorption characteristics, see Utility Model Publication No. 48-36621 and Utility Model Application Publication No. 1983-36621.
This invention has already been disclosed in No. 164623, etc., but the present invention is an improvement on these known techniques.

This will be explained below based on examples.

FIG. 2 is a sectional view showing an example of the horizontal hanging member 20 according to the present invention, and the entire structure is made up of concentric pipe members 21 and 22.
2, elastic holding members 23 made of, for example, vibration-proof rubber are provided near both ends of the pipe member, and the inner pipe member 22 is supported in a spaced manner from the outer pipe member 21. Further, 24 is a vibration-absorbing material made of a non-corrosive inorganic material (for example, sand) or an organic material (for example, a piece of synthetic resin), which is enclosed in the internal pipe member 22 if necessary.

By configuring the horizontal suspension member 20 as described above, there is a difference in the natural vibration frequency between the external pipe 21 and the internal pipe 22, and even if vibration occurs in the horizontal suspension member 20, each The structural members 21 and 22 cancel each other out due to the difference in their natural vibrations, and the development of large vibrations can be effectively suppressed.

FIG. 3 shows another embodiment of the present invention, and the same reference numerals as in FIG. 2 indicate the same configurations. In this embodiment, a round bar 25 is used in place of the internal pipe shown in FIG. 2, which further simplifies the structure.

Figures 4 and 5 are diagrams showing the experimental results of vibration absorption characteristics, where Figure 4 shows the case where the horizontal hanging member is configured only with a conventional hollow pipe, and Figure 5 shows the case where the horizontal hanging member is constructed using only a conventional hollow pipe. This figure shows an embodiment of the present invention in which the pipe has a double structure with an internal and external structure, with a vibration-proof rubber interposed between them. In the case of the present invention shown in FIG. 5, it can be clearly seen that the vibration damping effect is rapidly observed.

As described above, by using the horizontal hanging material of the present invention, it is possible to significantly suppress the occurrence of vibrations in the jumper device due to wind pressure, and this is an advantage in light of the trend of increasing the size of overhead power transmission lines. ,
There is great significance in being able to downsize the Japer device and, by extension, downsize the steel tower that supports it.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing how the prefabricated jumper device is installed, Fig. 2 is a sectional view showing an example of a horizontal hanging member of the jumper device according to the present invention, and Fig. 3 is another embodiment according to the present invention. Partial sectional view showing 4th
5 and 5 are diagrams showing the experimental results of vibration absorption characteristics. 1, 20: horizontal hanging material, 10: electric wire.

Claims (1)

[Scope of utility model registration request] Consisting of a rigid hollow tube of a predetermined length and a rigid rod that has a different natural vibration frequency from the hollow tube and can be housed within the hollow tube, the rigid rod is provided near both ends of the hollow tube. A horizontal suspension member for a jumper device, which is supported in a spaced manner from the hollow tube via an elastic holding member.