JP2000295727A - Overhead cable installation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an overhead cable installation method by which a messenger wire for supporting an overhead cable such as a communication cable, etc., and the overhad cable are installed between supporting pillars such as poles, etc., efficiently and economically. SOLUTION: First, a guide rope 2 which is inserted through a spiral cable holding member 3 held by the guide rope 2 is temporarily retained between supporting pillars 1 and then a messenger wire 7 is installed through the spiral cable holding member 3 wound around the temporarily retained guide rope 2. Then the guide rope 2 is released from retainment by the supporting pillars 1 and an overhead cable 8 is attached to the one end of the guide rope 2 movable in the spiral cable holding member 3 and the guide rope 2 is pulled to install the overhead cable 8 so as to be supported by the messenger wire 7 and the spiral cable holding member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a wire for erection such as a communication cable or a power distribution cable between columns such as a telephone pole.

[0002]

2. Description of the Related Art In general, poles such as telephone poles erected in the city include overhead ground lines, high-voltage distribution lines, medium-voltage distribution lines, security communication lines, communication cables for cable television, NTT telephone lines, and the like. Overhead lines are laid at predetermined heights and intervals, and each is branched on the way as needed, and is branched and wired to each home, store, office, factory, and the like. When any new wire for installation is additionally installed on such a telephone pole, at a predetermined height or at an interval, for example, for a communication line for a cable TV, the height is 6.4 m to 6.7 m, and the height of the existing wire at the top and bottom is set. It is required that the cable be installed at a distance of 30 cm or more from the cable.

In order to lay a communication cable, such as a cable for a cable television, between utility poles, it is necessary to prevent a tension load from being applied to the cable itself. For this purpose, first, a messenger wire for supporting the cable is installed. do it,
Thereafter, the communication cable is suspended by a cable hanger or the like so as to be attached thereto.

[0004]

However, the supporting wire material such as messenger wire which must be extended before the cable is laid is hard and heavy because it is made of stranded steel, and large deflection due to its own weight when the wire is extended. If the cable is bent and rubbed against the existing cable in a bent state, the existing cable may be seriously injured.

Conventionally, various measures have been taken to prevent such a problem. As a general method, first a soft guide rope is sewn through the existing cable and the messenger wire hanging it so that they do not get tangled, and A rope (parent rope) is tentatively stretched between utility poles, and a wire wheel (pulley) is suspended on the guide rope every 7 to 8 m so that the messenger wire does not slack.
Pass the rope (child rope) for pulling in the messenger wire through the wheel, connect the messenger wire to one end of the child rope, pull in the messenger wire by pulling the child rope, and stretch the messenger wire between telephone poles Has been done.

As another method, in order to omit the operation of attaching a wheel, there is a case where a guide rope is not used, and the tension of the messenger wire at the time of retraction is increased to reduce the deflection. . Specifically, a person is attached to the payout cable drum, the rotation of the drum is suppressed, and the messenger wire is extended while appropriately applying a brake. However, the average distance between telephone poles is 30-
Since the length is 40 m, a very large tension is required to keep the deflection small by this method, and it is necessary to apply a strong brake. Also, it is good when a lot of messenger wires are wound around the cable drum, but when the number of windings is small, the cable drum becomes lighter, and sometimes the cable drum moves or floats up, which may be dangerous. Therefore, as a countermeasure, build a tower with a wheel in a place where it may come into contact with the lower cable, extend a wheel with a wheel on a bucket of an aerial work vehicle, or stand a rod from below. It was necessary to use a very laborious and labor-intensive measure, such as manually lifting the messenger wire.

Furthermore, even in the subsequent cable erection work, in the conventional construction method, the guide rope for pulling the cable is stretched while attaching the roller hanger again, and then the cable is pulled in. 50cm cable hanger
It was necessary to perform a very time-consuming task of manually attaching them to each other. These operations are time-consuming operations of mounting one by one manually on an aerial work vehicle. In addition, when the aerial work vehicle cannot be entered, the work is carried out while riding on a spacecraft and moving.

As described above, according to the conventional method, it is necessary to repeatedly perform a time-consuming operation of attaching a wheel wheel, attaching a roller hanger, and attaching a cable hanger, and performing such an operation is extremely troublesome. .
An object of the present invention is to solve the above-mentioned problems and to provide a method for efficiently laying a laying wire while avoiding friction and contact with an existing cable.

[0009]

In the present invention, the erection of the erection wire is performed from the stage of erection of the supporting wire by using a wire holder wound in a coil shape. That is, first, a guide rope for temporarily supporting the supporting wire is passed through the coil of the wire holding body formed into an extensible coil shape, and temporarily fixed to the support to stretch between the supports. Hand, and then pass the supporting wire through the coil of the coiled wire support, and while the supporting wire is supported by the elongated coiled wire holder and the guide rope, the supporting wire is interposed between the columns. After stretching the guide rope, the guide rope and the support are temporarily fixed and the guide rope is movable in the coil, and the guide rope is pulled with the construction wire attached to one end of the movable guide rope. After being moved so that the erection wire is inserted into the coil, the erection wire is fixed to the column.

[0010] As a wire holder wound in a coil shape,
A deformed synthetic resin wire coil described in Japanese Patent Application No. Hei 8-222299 (Japanese Patent Application Laid-Open No. Hei 10-37997) filed by the present applicant, and Japanese Patent Application No. Hei 9-114939 similarly filed by the present applicant. (Japanese Unexamined Patent Publication No. 10-285771)
, A coiled cable hanger made of a synthetic resin stranded wire or the like is used. It is already performed to extrapolate the above-described cable hanger to the already stretched messenger wire and use it as a support for the cable.In the present invention, however, the coiled cable hanger as described above is used. It is used from the stage of erection of a supporting wire such as a messenger wire, and a guide rope for erection of the supporting wire is used as it is as a guide rope of the erection wire.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a specific procedure of the method of the present invention will be described with reference to FIGS. Attachment of mounting metal fittings and wheel wheel In the same manner as in the conventional method, a mounting metal fitting 4 with a metal wheel is mounted to stop the messenger wire at a predetermined height of the electric pole 1. A No. 4 wheel (a pulley) is suspended from the pole fittings of the telephone poles at both ends, and a No. 2 wheel is suspended from the intermediate pole.

Main rope extension wire A nylon guide rope 2 (parent rope) is passed through the No. 2 wheel of the intermediate pillar and stretched between the utility poles at both ends in tension. At that time, the guide rope is previously passed through the extendable coil-shaped cable hanger 3, that is, 1
One coil hanger is prepared for each pair of utility poles in a number corresponding to the number of turns corresponding to between the utility poles, and the guide rope is passed through the loop (see FIG. 1). The coiled cable hanger 3 has a shape as shown in FIG.

Extension of Coiled Cable Hanger and Retraction of Messenger Wire After temporarily fixing one end of the coil 3 to the main rope 2 near the electric pole, the other end is pulled with a pull cord to spread the coil. Temporarily fix to rope 2. At that time, the next messenger wire pull-in rope 5 (child rope) is passed through the coil. The end of the child rope is tied to the twisted-up winding grip 6, the end of the messenger wire 7 wound around the drum is gripped by the winding grip 6, and the other end of the child rope 5 is guided. , Hoisting machine 9
The messenger wire 7 is pulled into the coil by winding up with a winch (see FIG. 2).

After tightening one end of the messenger wire 7 to the pole fitting 4 of the telephone pole, grasp the other end with the grip of the drawer and pull it up.
The other end is fixed to the pole fitting 4 of the telephone pole. In the middle pole, the messenger wire 7 is detached from the wheel and transferred to a suspension bracket to be fixed. As a result, both the parent rope 2 and the messenger wire 7 are stretched between the columns 1, and the extended coil hanger 3 is wound around the column. Transfer and fixation of the coiled cable hanger The end of the coiled cable hanger 3 temporarily fixed to the parent rope 2 is removed and fixed to the tight messenger wire 7. The main rope 2 is untied and loosened at both ends, and temporarily left in the coiled cable hanger. As a result, the parent rope 2 is released from the stretched state, and becomes movable in the coil hanger 3.

Cable Pull In Connect the twisted cable grip to the end of the parent rope 12, grasp the end of the cable 8 wound around the drum with the cable grip, and guide the other end of the parent rope 2, The cable 8 is pulled up into the coil hanger 3 by winding it up with a winch.

Installation and Finishing of the Device The messenger wire 7 and the cable 8 are bundled at necessary places and tied with a string, and the construction is completed. by this,
The cable 8 is supported and supported by the messenger wire 7 by the cable hanger 3. (FIG. 3
reference)

The coiled cable hanger may be inserted from the beginning when the guide rope is stretched so that the coiled cable hanger can be inserted through the loop so that the guide rope penetrates the loop. After the guide rope is tightened between the columns, the invention is filed by the applicant of the present invention.
No. 2 "Tool for arranging coiled cable hanger"
Can also be easily performed.

Further, the ends of the coiled cable hanger before and after the extension may be temporarily fixed to the pole fittings of the electric pole instead of the main rope. Further, if a leader with a return prevention is attached to the end of the coil at the time of extension, there is no need to worry about return of the coil, and it is possible to easily extend the rope by walking down and pulling the towline manually.

As described above, there is no need to worry about friction due to the bending of the messenger wire, and the pay-out drum can be easily delivered because it does not need to be braked. Messenger wire can be stretched between struts at a stretch. Even with the construction method in which a wheel is not attached in the middle of the parent rope, the deflection is large between the supports on the messenger wire feed-out bobbin side, but the sliding friction resistance gradually builds up, and between the supports on the winding side with the winch. The more the messenger wire sags, the less. Therefore, the method of the present invention may be used only between the first and second columns.

This construction method is an additional construction method that prevents bending during construction work and eliminates frictional damage to existing cables and the like even in the construction of self-supporting distribution cables between utility poles that do not require messenger wires. Can also be applied. For example, the case of erection work of a self-supporting cable will be described. Until a guide rope passing through a coiled cable hanger is stretched, it is the same as the messenger wire erection preparation described above.

Next, the cable is passed through the coiled cable hanger and pulled together, so that the cable is stretched along the guide rope while being supported by the coil at the same time as the coil is extended, and then the cable is stretched. Give the specified tension and secure it to the utility pole. Finally, in the case of a self-supporting cable, no hanger is required, so the coiled cable hanger and guide rope must be removed. However, the coiled cable hanger uses the aforementioned extrapolation tool,
The coil can be easily removed from the cable by rotating the coil in the direction opposite to the extrapolation.

[0023]

EXAMPLE First, a mounting bracket for suspending a messenger wire is attached to a pair of columns 30 m between columns,
A wheel was hung on the pole fitting. Next, a 6 mm nylon guide rope was stretched between the columns above the mounting bracket. At that time, wire diameter 6mm, wire twist pitch 42m
m, a coil-shaped cable hanger having a coil diameter of 100 mm and a coil winding number of 120 was set between the supports with the guide rope penetrating through the loop, that is, in an externally inserted state. The rope of the guide rope was tied to the support, the other support was wired, and the guide rope was stretched over the pins. The deflection at the center was 3 cm.

After temporarily fixing the rear end of the coil to the guide rope near one of the columns with a fixing bracket, another new guide rope for drawing in the messenger wire is pulled through the coil together with the coil tip, and the coil is pulled up. Stretching and extension of the new guide rope were done at the same time. The end of the elongated coil was fixed to the original tensioned guide rope near the column. The deflection at the center at this point is about 10
cm.

Next, a 30 mm2 steel stranded wire was pulled out from the drum to one end of the newly passed guide rope, the tip thereof was tied, and the guide rope was pulled to pull the messenger wire into the coiled cable hanger. that time,
The messenger wire was easily picked up, and the messenger wire could be stretched between the columns at a stretch. The deflection at the center at that time spread to about 50 cm.

[0026] One end of the messenger wire is wrapped around it and fastened to a pillar mounting bracket with a grip, and the other end is gripped with a wire stretcher.
After tensioning so that the deflection was 30 cm, the sample was similarly fixed to a column. Finally, the end of the coiled cable hanger temporarily fixed to the guide rope was transferred to a messenger wire and fixed, and then the tension of the guide rope was removed. With the above, the cable hanger and the guide rope for pulling in the cable are already set on the completed messenger wire. Next, the cable was easily pulled in using the guide rope.

[0027]

According to the erection method of the present invention, the coil-shaped cable hanger is also used when laying a supporting wire such as a messenger wire, which is the most troublesome in cable laying work. The problem of frictional injury with the existing cable on the lower side due to bending can be avoided.

Further, in the conventional method, it was necessary to repeatedly perform a time-consuming operation of attaching a wheel wheel, attaching a roller hanger, and attaching a cable hanger. However, the present invention provides a method for negotiating a support wire such as a messenger wire. At the same time, the installation of the cable hanger can be completed, and the guide rope used for erection of the supporting wire can be used as it is as the guide rope for the erection wire, thereby providing an erection method having a great merit in terms of work efficiency.

[Brief description of the drawings]

FIG. 1 shows a state in which a guide rope (parent rope) passed through a coil-shaped wire holder is stretched between supports.

FIG. 2 shows a state in which a supporting wire (messenger wire) is drawn into a coiled wire holder (coil hanger) using a pull-in rope (child rope).

FIG. 3 shows a state in which the erection wire is supported by a support wire by a coiled wire holder.

FIG. 4 shows a state before extension of the coiled wire holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prop (electric pole) 2 Guide rope (parent rope) 3 Coiled cable hanger 4 Mounting bracket 5 Pull-in rope (child rope) 6 Winding grip 7 Supporting wire (messenger wire) 8 Erecting wire (cable) 9 Winding Machine

Claims (1)

[Claims] At least one wire for erection and one wire for support are provided.
In the method of erection between a pair of columns, first, a guide rope for temporarily supporting a supporting wire is passed through a coil of a wire holder formed in an extensible coil shape, and then the guide rope is fixed to the column. Temporarily fixed and stretched between the columns, and then the supporting wire was passed through the coil of the coiled wire holder, and the supporting wire was supported by the elongated coiled wire holder and the guide rope. After the supporting wire is stretched between the supports in the state, the guide rope and the support are temporarily fixed and the guide rope is made movable in the coil, and the erection wire is attached to one end of the movable guide rope. Pull the guide rope and move it while
A method for erection of a erection wire, wherein the erection wire is inserted into a coil, and then the erection wire is fixed to a column.