JP2007215284A - Preprocessing jig for drawing out in-channel laid cable, and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preprocessing jig for drawing out an in-channel laid cable that can release the fixed portion of the cable from the internal face of a channel without using large-scale working machinery and materials, and a method. <P>SOLUTION: There is used the jig 10 having a wire connecting part 14 at least at one end side of a cylindrical body 12 having an outside diameter that allows the penetration of the body into the channel 20, and an inside diameter that allows the penetration of the cable 22 laid in a channel into the body. Prior to the draw-out of the cable 22 laid in the channel 20, a wire 26 penetrated in the channel is connected to the wire connecting part 14 of the jig 10 at one end side of the channel 20, and the cable 22 is made to penetrate the cylindrical body 12 of the jig 10. After that, the jig 10 is moved to the other end side from the one-end side of the channel 20 by towing the wire 26 at the other end side of the channel 20, and the internal face of the channel 20 and the fixed portion 24 of the cable 22 are thereby released from each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-pipe installed cable drawing pre-treatment jig used to release the inner surface of the pipe and the fixed portion of the cable before pulling out the cable installed in the pipe, and a pipe using the same. The present invention relates to the pre-drawing method for the inner laying cable.

  The power cable and communication cable installed in the underground pipeline need to be removed from the pipeline when it becomes old or malfunctions. The removal method is to pull the cable at one end of the pipeline and pull it out. However, if the inner surface of the pipeline and the cable are fixed by residue (deposits, etc.) in the pipeline, the cable will be within the allowable tension. With the traction force of, it may be impossible to pull out the cable. In such a case, there is only a method of excavating the road surface and removing the pipe and the cable together, or leaving the cable in the pipe, and both methods hinder the subsequent process.

  As a means for solving this problem, Patent Document 1 discloses a method of pulling out a cable after releasing a fixing portion between the pipe and the cable.

JP 2001-224112 A

  However, the construction method disclosed in Patent Document 1 requires a large amount of work equipment such as a hydraulic unit, a propulsion pipe, a propulsion device, and a cutting bit, which is disadvantageous in that it is costly.

  Cable laying pipelines are usually buried under the roadbed of public roads, and manholes are installed at appropriate distances. When pulling out the cable, the manhole cover on the road surface will be opened and work will be done inside and outside the manhole. However, the work space on the road and in the manhole is limited. It is desirable to use it. In the method of Patent Document 1, work equipment is large, and it is difficult to secure a work space.

  An object of the present invention is to provide a pre-drawing jig for cable drawing, which can release the inner surface of the pipe and the fixed portion of the cable without using a large-scale work equipment, and a pipe-laying using the same. The object is to provide a cable drawing pre-treatment method.

  The pipe laying cable pre-treatment jig according to the present invention has an outer diameter that can be inserted into the pipe and a wire connecting portion at least on one end side of the cylinder having an inner diameter that can be inserted through the cable laid in the pipe. Is provided.

  In the jig according to the present invention, it is preferable that two wire connection portions are provided at one end with an interval in the circumferential direction in a region within a half circumference of the cylindrical body.

  Further, the jig according to the present invention is provided with a slope that rises from both ends toward the central portion on the inner peripheral surface of the region on the opposite side to the region within the half circumference where the wire connecting portion of the cylindrical body is provided. More preferred.

  Further, the pre-drawing method for laying cable in a pipeline according to the present invention is a method of pre-drawing a cable laid in a pipeline, before the cable laid in the pipeline is connected to the wire connecting portion of the jig on one end side of the pipeline. Connect the wire passed through, insert the cable through the cylinder of the jig, and then pull the wire at the other end of the pipe to remove the jig from one end of the pipe It moves to an end side, and this releases the fixed part of a pipe inner surface and a cable, It is characterized by the above-mentioned.

  According to the present invention, it is possible to release the fixing portion between the inner surface of the pipe and the cable simply by drawing the jig through which the cable is inserted into the pipe. Therefore, without using a large-scale device, the cable inner surface and the cable fixing portion can be easily and efficiently released, and the cable can be reliably pulled out. In addition, since the work equipment to be installed inside and outside the manhole can be as small as a winch that pulls the wire, it is easy to secure a work space. In addition, the construction period can be shortened.

  FIG. 1 shows an embodiment of a pre-drawing jig for laying cable in a pipeline according to the present invention. This jig 10 is provided with wire connecting portions 14 at both ends of a steel cylinder 12. It has an outer diameter that can be inserted into the pipe line of the cylindrical body 12 and an inner diameter that can be inserted through a cable installed in the pipe line. The outer diameter of the cylinder 12 is preferably larger than the inner radius of the pipe, and the inner diameter of the cylinder 12 is preferably large enough to allow the cable to pass therethrough. The length of the cylinder 12 may be the same as or slightly longer than the inner diameter of the pipe.

  The wire connection portion 14 is provided by welding a steel plate piece 14 b in which a wire connection hole 14 a is formed to the end portion of the cylindrical body 12. The steel plate piece 14 b is fixed to the cylindrical body 12 by welding an arc-shaped interposed piece 16 to the inner surface of the cylindrical body 12 and welding it to the inner surface of the interposed piece 16. Two wire connecting portions 14 are provided at one end of the cylindrical body 12 at an interval in the circumferential direction with an interval in the circumferential direction.

  In addition, slopes 18 that rise from both ends of the cylinder 12 toward the center are provided on the inner peripheral surface of the area on the opposite side of the area within the half circumference where the wire connection portion 14 of the cylinder 12 is provided. The slope 18 is formed by welding a thin steel plate formed into a gentle mountain shape to the inner surface of the cylindrical body 12.

  FIG. 2 shows an embodiment of a pre-drawing method for laying cable in a pipeline using the jig 10 of FIG. When trying to pull out the cable 22 installed in the underground pipeline 20, the pipeline 20 and the cable 22 may be fixed by the residue 24 (deposits, etc.) in the pipeline 20, and may not be pulled out. . In such a case, the jig 10 is used before the cable drawing operation.

  First, the tow wire 26 is passed through the pipe line 20, and the wire connecting part 14 on one end side of the jig 10 is connected to the rear end side in the pulling direction of the wire 26 at one end side of the pipe line (usually in a manhole). While connecting, the cable 22 is inserted through the cylindrical body 12 of the jig 10. The connection between the wire connecting portion 14 and the wire 26 is performed via a general-purpose connection fitting (not shown).

  Thereafter, when the wire 26 is pulled in the direction of arrow P on the other end side of the pipe line 20, the jig 10 moves in the pipe line 20 while the cable 22 is inserted into the cylindrical body 12 (the cable 22 does not move). ). When the jig 10 comes to a position where the pipe line 20 and the cable 22 are fixed by the residue 24, the tubular body 12 bites between the pipe line 20 and the cable 22 by the pulling force of the wire 26, and the fixed part is peeled off. Act on. For this reason, the fixed part of a pipe line and a cable can be easily released. If the jig 10 is moved from one end side to the other end side of the pipe line 20 in this way, there is no fixed portion between the pipe line and the cable, so that the cable can be easily pulled out by pulling the cable thereafter. .

  As shown in FIGS. 1B and 1D, if the slope 18 is provided on the inner surface of the cylindrical body 12, the cable 22 is lifted by the slope 18, so that the cylindrical body 12 is connected to the conduit 20 and the cable 22. It becomes easy to bite in between, and the fixed part can be released more smoothly.

  Further, if two wire connection portions 14 are provided per one end of the cylinder 12, the rotation of the jig 10 is suppressed when the jig 10 is pulled by the wire 26, and the interference between the wire connection portion 14 and the cable 22 is prevented. Can be prevented.

  Also, if the two wire connecting portions 14 are provided in an area within a half circumference of the cylindrical body 12, the other half circumference area enters between the pipe line 20 and the cable 22, so that the pipe line and the cable are more easily peeled off. It can be done reliably.

  In addition, if the two wire connection portions 14 are provided in a region within a half circumference of the cylindrical body 12, the jig 10 moves in the forwardly bent state as shown in FIG. The road and cable can be peeled off more reliably.

  In this embodiment, the wire 28 is also connected to the wire connecting portion 14 on the rear end side of the jig 10, but the wire 28 is not necessarily attached to the conduit and the cable when the tip end 26 is pulled. This is for pulling the jig 10 back to the original position or an arbitrary position when it cannot be released or as necessary.

1 shows an embodiment of a pre-drawing jig for laying cable in a pipeline according to the present invention, (A) is a plan view, (B) is a front view, (C) is a side view, and (D) is (B). DD line sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an embodiment of a pre-drawing method for laying cable in a pipeline according to the present invention. Explanatory drawing which shows the inclination state of the jig | tool in embodiment of FIG.

Explanation of symbols

10: Pipe laying cable pre-treatment jig 12: Tube 14: Wire connection 16: Interposition piece 18: Slope 20: Pipe 22: Cable 24: Residue 26: Wire

Claims (4)

  Before pulling out a cable laid in a pipe, characterized in that a wire connecting portion is provided on at least one end side of a cylindrical body having an outer diameter that can be inserted into the pipe and an inner diameter through which a cable laid in the pipe can be inserted. Processing jig.   The pre-drawing processing jig according to claim 1, wherein two wire connecting portions are provided at one end of the cylindrical body at an interval in a circumferential direction within a half circumference.   3. The drawing according to claim 1, wherein a slope that rises from both ends toward the central portion is provided on an inner peripheral surface of a region opposite to a region within a half circumference where the wire connecting portion of the cylindrical body is provided. Pretreatment jig.   Prior to pulling out the cable laid in the pipe line, on one end side of the pipe line, a wire passed through the pipe line is connected to the wire connection part of the jig according to any one of claims 1 to 3. In addition, the cable is inserted into the cylindrical body of the jig, and then the jig is moved from one end side to the other end side of the pipe line by pulling the wire on the other end side of the pipe line. A pre-drawing method for laying cable in a pipe line, wherein the inner surface of the pipe line and the fixed portion of the cable are released.

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