JP4460052B2 - Overhead cableway - Google Patents

Description

  The present invention relates to an overhead electric line.

As described in Patent Document 1, the conventional overhead electric line is integrated with a messenger wire by a supporting column, a messenger wire stretched between the supporting columns, and attached to the messenger wire and by a lashing wire. The aerial cable is provided with an offset portion.
The offset portion is formed to absorb the extension of the overhead cable due to heat.

JP-A-9-233664

  However, in order to form the offset portion in the overhead electric wire path, after the overhead cable is extended between the support columns, it is necessary to pull back the overhead cable in order to form the offset portion, and the offset portion is formed. There was a problem that the work was very troublesome.

The present invention provides an aerial electrical wire line that solves the above-mentioned problems, and the invention according to claim 1 is attached to a support column, a messenger wire stretched between the support columns, and the messenger wire. And an overhead cable integrated with a messenger wire by a lashing wire, wherein the overhead cable is a separation fitting attached at a separation position between the messenger wire and the overhead cable near the support column. The aerial cable is allowed to move in the direction of the track, and is installed in a substantially straight line between the support columns in a state in which no offset portion is formed. It is an aerial electric wire path characterized by absorbing the extension caused by.

Further, in the invention according to claim 2, in place of the separation metal fitting, a restraining tool that grips them collectively is attached to a messenger wire, a lashing wire, and an aerial cable located between the support pillars, and the restraining tool is located on the restraining tool. 2. The overhead electric wire path according to claim 1, wherein the overhead cable meanders in the longitudinal direction with the overhead cable portion as a fixed point.

Furthermore, in the invention according to claim 3, the aerial cables are installed on both sides of the support column so that the axial force generated toward the support column side due to the thermal extension of the aerial cable located on both sides of the support column becomes equal. The aerial cable path according to claim 1, wherein the aerial cable is meandered in the longitudinal direction with a point where the axial force of the aerial cable portion located on the support column becomes equal as a fixed point.

Furthermore, in the invention described in claim 4, the aerial cables are installed on both sides of the support column so that the axial force generated toward the support column side due to the thermal extension of the aerial cable located on both sides of the support column differs. Put a pipe of a predetermined length in the longitudinal direction of the outer periphery of the aerial cable located at the pillar part, fix the pipe to the support pillar, and fix the aerial cable as a fixed point where the aerial cable part located in the pipe hits the inner wall of the pipe The overhead electric wire path according to claim 1, wherein the overhead electric wire is meandered in a longitudinal direction.

The present invention has the following effects.
As in the aerial cable line according to claim 1, the aerial cable is installed between the support columns in a state where no offset portion is formed, and the aerial cable is meandered in the longitudinal direction to absorb the extension of the aerial cable due to heat. If comprised in this way, the operation | work for offset part formation will become unnecessary and formation of an overhead electric wire path will become easy.

  In addition, as in the aerial cable line according to claim 2, a restraining tool for holding these members together is attached to a messenger wire, a lashing wire and an aerial cable located between the support pillars, and the aerial cable portion located in the restraining tool By configuring the aerial cable to meander in the longitudinal direction with the fixed point as the fixed point, it is possible to prevent the messenger wire, lashing wire, and aerial cable from moving in the line direction and to easily meander the aerial cable in the longitudinal direction. The extension of the overhead cable due to heat can be easily absorbed.

  Further, as in the overhead electric line according to claim 3, the overhead cable is provided on both sides of the support column so that the axial force generated toward the support column side due to the extension of the overhead cable located on both sides of the support column becomes equal. If the aerial cable is configured to meander in the longitudinal direction with the aerial cable part positioned at the support column as a fixed point, it can easily absorb the extension of the aerial cable due to heat without the need for a restraint. it can.

  Further, as in the aerial cable line according to claim 4, the aerial cable is provided on both sides of the support column so that the axial force generated toward the support column side due to the thermal extension of the aerial cable located on both sides of the support column is different. If a construction is made so that the aerial cable meanders in the longitudinal direction with the aerial cable part positioned in the pipe as a fixed point, covering the aerial cable part with a predetermined length in the longitudinal direction of the aerial cable located in the support column part It is possible to install an aerial cable without considering the thermal extension of the aerial cable located on both sides of the pillar, so it is easier to install the aerial cable and does not cause buckling of the aerial cable located at the fixed point. effective.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an overhead electric line according to the present invention. In the figure, 1 is a support column, 2 is a messenger wire, 3 is an aerial cable, and 4 is a lashing wire.

  A plurality of support pillars 1 are provided at predetermined intervals, and a messenger wire 2 is stretched between the support pillars 1. The messenger wire 2 is formed of a steel twisted wire or the like, and an aerial cable 3 is attached to the messenger wire 2. The aerial cable 3 is a bundle of three single-core cables having a conductor covered with an insulating layer, a sheath, or the like. Three single-core cables are bundled by being loosely twisted. The messenger wire 2 and the overhead cable 3 are integrated by a lashing wire 4.

  The above configuration is the same configuration as a conventional overhead electric line, but the overhead electric line according to the present invention is such that the overhead cable 3 is stretched substantially linearly and no offset portion is formed in the longitudinal direction of the line. There are features. In the present invention, the fact that the offset portion is not formed includes a case where the aerial cable is laid down slightly in the support column portion. In other words, the aerial cable located at the support column is laid apart from the messenger wire, so it is installed in a slack, but this is an offset that takes into account the thermal extension of the aerial cable. Therefore, the aerial cable according to the present invention is included in the concept that the aerial cable is installed between the support columns in a state where the offset portion is not formed. Further, the aerial cable 3 located near the central portion between the support columns 1 also slightly hangs down due to its own weight or the like, but such a sag is included in the concept that the above-described aerial cable 3 is stretched substantially linearly. For example, when the cable is laid during a high temperature period such as summer, the cable may contract in the low temperature period in winter when the overhead cable 3 located near the center between the support pillars 1 hangs down due to its own weight. However, there is an effect of absorbing this cable contraction.

  As shown in FIG. 1, the aerial cable 3 is stretched between the support columns 1 in a substantially straight line, and no offset portion is formed. When the offset portion is not formed in this way, thermal expansion / contraction of the aerial cable, in particular, extension of the aerial cable due to heat becomes a problem.

The present invention absorbs the extension of an aerial cable due to heat by causing meandering in the longitudinal direction of the aerial cable, rather than absorbing it by an offset portion as in the prior art.
That is, as in the aerial cable path of FIG. 1, an aerial cable is installed without forming an offset portion in the aerial cable, and the aerial cable is meandered in the longitudinal direction to absorb the extension of the aerial cable due to heat.

  In FIG. 1, reference numeral 30 denotes a separation fitting attached at a separation position between the overhead cable 3 and the messenger wire 2. This separating metal fitting allows the aerial cable to move in the direction of the track and does not restrain the aerial cable. This separation metal fitting may be omitted.

  FIG. 2 shows another embodiment of the present invention. The difference from the above embodiment is that the restraining device 10 holds and fixes the messenger wire, the lashing wire and the aerial cable located between the support pillars in a lump. It is the point which attached.

  The restraining tool 10 in FIG. 2 collectively holds and fixes the messenger wire 2, the lashing wire 4 and the aerial cable 3 located on both sides of the support column 1. The structure of the restraint tool 10 is not particularly limited as long as it can hold and fix the messenger wire 2, the lashing wire 4 and the overhead cable 3 together. For example, the messenger wire 2, the lashing wire 4 and the aerial cable are held together by holding the messenger wire 2, the lashing wire 4 and the aerial cable 3 with two members and tightening the two members with bolts and nuts. 3 can be held and fixed collectively.

  As described above, when the restraining tool 10 that holds and fixes the messenger wire 2, the lashing wire 4 and the aerial cable 3 between the support pillars is attached, the aerial cable 3 is extended by heat. In this case, the aerial cable 1 can be caused to meander in the longitudinal direction with the aerial cable portion positioned on the restraint as a fixed point. Therefore, the extension of the overhead cable due to heat can be easily absorbed.

  Note that the number of attachments of the restraint 10 and the attachment interval are appropriately selected in consideration of the length of the overhead cable and the like.

  FIG. 3 shows still another embodiment of the present invention. The difference from the above embodiment is that the shaft generated toward the support column side as the aerial cable 3 located on both sides of the support column 1 is extended by heat. The aerial cable 3 is installed on both sides of the support column 1 so that the forces A and B are equal.

  In this way, when the overhead cable 3 is installed on both sides of the support column 1 so that the axial forces A and B are equal, the overhead cable portion where the axial forces A and B are equal becomes a fixed point, and the overhead cable 1 is stretched by heat. When the cable is taken out, the aerial cable 1 meanders in the longitudinal direction with the fixed point as a base point, whereby the extension of the aerial cable 1 due to heat can be absorbed.

  FIG. 4 shows still another embodiment of the present invention. The difference from the above embodiment is that the shaft generated toward the support column side as the aerial cable 3 located on both sides of the support column 1 is extended by heat. An aerial cable 3 is installed on both sides of the support column 1 so that the forces A and B are different, and a pipe 20 having a predetermined length is covered in the outer peripheral longitudinal direction of the aerial cable 3 positioned at the support column 1 portion. The pipe 20 is fixed to the support column 1.

As described above, when an aerial cable is installed on both sides of the support column so that the axial force generated toward the support column side due to the thermal extension of the aerial cable located on both sides of the support column differs, There is an effect that it becomes easy. When a predetermined length of pipe fixed to the support column 1 is put in the longitudinal direction of the outer periphery of the aerial cable located in the support column part, the aerial cable moves in the longitudinal direction in the pipe 20 along with the extension due to heat. At the point where the forces are balanced, the aerial cable is deformed and hits the inner wall of the pipe, and the position becomes a fixed point, thereby causing meandering in the longitudinal direction of the aerial cable. Therefore, the extension of the overhead cable due to heat can be easily absorbed. Further, since the excessive bending of the aerial cable located at the fixed point is restricted by the pipe 20, there is an effect that the aerial cable that is the fixed point is not buckled.

  The means for forming the fixed point in the aerial cable is not limited to the above-described embodiments. For example, a gripping tool or the like is fixed to the aerial cable 3 located on the support column 1 and the gripping tool or the like is fixed to the support column. By fixing to 1, the portion of the fixed aerial cable 3 may be set as a fixed point.

The schematic block diagram which shows one Embodiment of the overhead electric wire path which concerns on this invention, The principal part block diagram which shows other embodiment of this invention, The principal part block diagram which shows other embodiment of this invention. The principal part block diagram which shows other embodiment of this invention.

Explanation of symbols

1 Support Pillar 2 Messenger Wire 3 Aerial Cable 4 Lashing Wire 10 Restraint 20 Pipe
30 Separating bracket

Claims (4)

In the overhead electric wire path comprising a support column, a messenger wire stretched between the support columns, and an aerial cable attached to the messenger wire and integrated with the messenger wire by a lashing wire, the aerial cable is The aerial cable is allowed to move in the line direction by a separation fitting attached at a separation position between the messenger wire and the aerial cable near the support column, and is not substantially formed between the support columns in a state where no offset portion is formed. An aerial electric wire that is installed in a straight line and absorbs the extension of the aerial cable due to heat by meandering the aerial cable in the longitudinal direction. Instead of the above-mentioned separation bracket, a restraining tool that grips them collectively is attached to a messenger wire, a lashing wire, and an aerial cable located between the support pillars, and the aerial cable portion is fixed to the aerial cable portion located in the restraint The overhead electric wire path according to claim 1, wherein the overhead electric line is meandered in a longitudinal direction.   Install the overhead cable on both sides of the support column so that the axial force generated toward the support column due to the thermal extension of the overhead cable located on both sides of the support column is equal. The overhead electric wire path according to claim 1, wherein the overhead cable meanders in the longitudinal direction with a point where the axial forces become equal as a fixed point.   Install the overhead cable on both sides of the support column so that the axial force generated toward the support column side due to the thermal extension of the aerial cable located on both sides of the support column is different. A pipe having a predetermined length is covered in the longitudinal direction, the pipe is fixed to a support column, and the aerial cable is meandered in the longitudinal direction with the point where the aerial cable portion located in the pipe hits the inner wall of the pipe as a fixed point. The overhead electric line according to claim 1.

Images