JP2011254566A - Overhead line vibration preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overhead line vibration preventing device having a mechanism for preventing drop of a weight irrespective of fracture of a suppression line of a double torsional damper portion.SOLUTION: A double torsional damper portion 20 includes: a suppression line 22; weights 24 fixed to both ends of the suppression line 22; and a wire grip clamp 27 fixed to the center of the suppression line 22. The line grip clamp 27 includes a clamp portion 28 gripping an overhead line. A weight reception portion 10 includes a weight tray 12 and a weight tray clamp 15. The double torsional damper portion 20 is installed on an overhead line 30 by the clamp portion 28, and the weight reception portions 10 are installed in positions of the weights 24 fixed to both ends of the suppression line 22 of the installed double torsional damper portion 20 by the weight tray clamp 15.

Description

  The present invention relates to an overhead wire vibration prevention device, and more particularly to an overhead wire vibration prevention device having a weight fall prevention mechanism regardless of the breakage of a deterrence line of a double torsional damper.

  When wind blows on the overhead electric wire, Karman vortex, which is a cross-spreading vortex, is generated on the leeward side of the electric wire, and vibration having an amplitude of 1 to several tens of millimeters is generated. This vibration gives repeated stress to the electric wire at the reflection point of vibration such as a suspension support point or a tension clamp which becomes a fixed point of the overhead electric wire, and causes the metal fatigue deterioration and breakage with time. In order to prevent this, a vibration preventing device is attached in the vicinity of the support point of the overhead electric wire.

  FIG. 2 is a damper configuration diagram showing the configuration of a conventional double torsional damper that is a vibration preventing device. In FIG. 2, the conventional double torsional damper 200 includes a restraining wire 22, a weight 24, and a wire gripping clamp 27. The weight 24 includes a fixing portion 26 that is fixed to the suppression wire 22, and is fixed to both ends of the suppression wire 22. The wire gripping clamp 27 includes a clamp portion 28 that grips the overhead wire 30 and a restraining wire compression hole 29 that is fixed to the restraining wire 22. The restraining wire compression hole 29 is compressed at the center of the restraining wire 22. The restraining wire 22 is fixed and attached to the overhead wire 30 by the clamp portion 28.

  In the conventional double torsional damper 200 shown in FIG. 2, the Karman vortex vibration generated by the wind is transmitted to the suppression line 22 and the weights 24 at both ends via the clamp portion 28. As a result, a new vibration is generated in the suppression line 22. This new vibration is different in phase and period from the vibration caused by Karman vortex, and acts to cancel the vibration caused by Karman vortex, thereby preventing the fatigue and breakage of overhead wire 22 over time.

  However, the suppression wire 22 is composed of the same core wire and a plurality of outer peripheral lines, and has a structure in which a plurality of outer peripheral wires are twisted around the core wire, and acts to cancel vibrations due to Karman vortices. When vibration is repeatedly generated on the suppression wire 22 over a long period of time, the core wire of the suppression wire and the plurality of outer peripheral wires rub against each other, resulting in metal fatigue deterioration and fracture, and the weight 24 falls. It has occurred.

  In Patent Document 1, a wire rope having a predetermined length is inserted and bent through insertion holes provided on the left and right sides of a fall prevention plate attached to a cap of a clamp body, and the vicinity of a vibration node when a weight undergoes secondary resonance. The end of the wire rope is collectively compressed and fixed to the weight by the dovetail sleeve, and the wire rope is at least of the deterrent line so that tension does not act on the wire rope even if the deterrence line resonates and swings excessively. There is a description that the length is 10 to 20% or more from the length.

JP 2006-230172 A

  The present invention has been made to solve such a problem, and an object of the invention is to oscillate an overhead electric wire having a mechanism for preventing a weight from falling regardless of breakage of a deterrence line of a double torsional damper portion. A prevention device is provided.

  The overhead wire vibration preventing device of the present invention is an overhead wire vibration preventing device for preventing vibration of the overhead wire, and the double torsional damper portion includes a restraining wire and weights fixed to both ends of the restraining wire. An electric wire gripping clamp fixed to the central portion of the restraining wire, the electric wire gripping clamp including a clamp portion for gripping the overhead electric wire, and the weight receiving portion including the weight receiving plate, the weight receiving plate clamp, The position of the weight in which the double torsional damper part is installed on the overhead electric wire by the clamp part, and the weight receiving part is fixed to both ends of the restraining line of the installed double torsional damper part Corresponding to the above, each of the overhead electric wires is configured by a weight pan clamp.

  According to the present invention, it is possible to provide an overhead electric wire vibration preventing device having a mechanism for preventing the weight from falling regardless of the breakage of the restraining line of the double torsional damper portion by the weight receiving portion.

The apparatus block diagram which shows the structure of the right side of the overhead wire vibration prevention apparatus by this invention. The damper block diagram which shows the structure of the conventional double torsional damper.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a device configuration diagram showing a configuration on the right side of an overhead wire vibration preventing device according to the present invention, and the left side also has the same configuration. In FIG. 1, the double torsional damper portion 20 includes a suppression wire 22, a weight 24 fixed to both ends of the suppression wire 22, and an electric wire gripping clamp 27 fixed to the central portion of the suppression wire 22. Since it is the same as the conventional double torsional damper 200 described in FIG. 2, detailed description thereof is omitted. The weight receiving portion 10 includes a weight receiving tray 12 and a weight receiving tray clamp 15.

  The double torsional damper portion 20 is installed on the overhead electric wire 30 by the clamp portion 28. Further, the weight receiving portions 10 are installed on the left and right by the weight receiving tray clamps 15 corresponding to the positions of the weights 24 fixed to both ends of the restraining line 22 of the installed double torsional damper portion 20, respectively. Configured. In installing the weight receiving portion 10, the weight receiving tray 12 reliably receives the weight 24 and is installed at a predetermined position that does not contact the weight 24.

  As described above, since the weight 24 and the weight tray 12 are not in contact with each other in the normal state, the weight tray 10 is not deteriorated due to unnecessary friction. The weight 24 that is broken by the vibration with time and falls can be reliably received. The received state can be found at the time of periodic inspection, and the double torsional damper unit 20 can be newly replaced.

  Further, according to this configuration, the double torsional damper unit 20 can continue to use the conventional double torsional damper 200, so that it is not necessary to develop a new double torsional damper. Moreover, with respect to existing objects, it is possible to reduce overheads for preventing vibration of overhead electric wires by additionally installing the weight receiver 10. Further, the weight tray 12 may have a plastic net-like structure for a part or all of the weight tray in order to reduce the influence of rainwater, snow accretion and icing and to reduce the weight.

  As described above, according to the present invention, it is possible to prevent the weight from falling by the weight receiving portion regardless of the breakage of the deterrent line of the double torsional damper portion, and to detect an abnormality during periodic inspection. It is possible to provide an overhead electric wire vibration preventing device capable of newly replacing the double torsional damper portion.

DESCRIPTION OF SYMBOLS 10 Weight receiving part 12 Weight receiving plate 15 Weight receiving plate clamp 20 Double torsional damper part 22 Deterrence wire 24 Weight 26 Adhering part 27 Electric wire holding clamp 28 Clamp part 29 Deterrence wire compression hole 30 Overhead electric wire 100 Aerial of this invention Electric wire vibration prevention device 200 Conventional double torsional damper

Claims (1)

An overhead wire vibration prevention device for preventing vibration of an overhead wire,
The double torsional damper portion has a deterrent wire, a weight fixed to both ends of the deterrence wire, and an electric wire gripping clamp fixed to a central portion of the deterrence wire,
The electric wire gripping clamp includes a clamp portion for gripping the overhead electric wire,
The weight receiver has a weight tray and a weight tray clamp,
The double torsional damper part is installed on the overhead electric wire by the clamp part, and the weight receiving part is fixed to both ends of the restraining line of the installed double torsional damper part. The overhead electric wire vibration preventing device, wherein the overhead wire vibration preventing device is configured to be installed on each of the overhead electric wires by the weight tray clamp corresponding to the position of the weight.

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