JP4802256B2 - Cable protective material extraction method and cable protective material extraction jig - Google Patents

Description

  The present invention relates to a cable protection material drawing method and a cable protection material drawing jig, and in particular, when performing quality control of a cable containing pipeline, such as when a pipeline containing a cable is repaired with a lining material. The present invention relates to a cable protection material extraction method and a cable protection material extraction jig for extracting a cable protection material mounted to protect an existing cable from a pipeline without damaging the cable.

  2. Description of the Related Art Conventionally, a technique for repairing a conduit such as a communication pipe or a power pipe embedded in the ground and containing a cable inside using a lining material in a state in which the cable is received is known. (For example, refer to Patent Document 1). With this technology, it is possible to protect a cable housed inside a pipeline (defective pipeline) that has deteriorated due to aging or deterioration due to rust or corrosion. In recent years, since the cable diameter has been reduced, it is possible to lay a plurality of cables in one pipeline (multiple laying), but by repairing using the above-mentioned technique Multi-strand laying can also be performed on defective pipes that already contain cables.

  When repairing the pipeline containing the cable with the lining material, to prevent the cable from being damaged by drawing the lining material into the pipeline, hot air when the lining material is cured, hot water, etc. It needs to be protected. Therefore, it is preferable to lay a cable protection material for protecting and protecting the cable in the pipe line. However, after repairing the pipeline with the lining material, the cable protection material must be removed from the cable, removed from the pipeline, and removed.

  In addition, in the prior art, as a method of pulling out a cable or the like from a pipeline, there is a method in which a pulling jig or a grip is provided at the end of the cable at a pipe opening, and the cable is pulled out in a tubular shape by a winch or other pulling machine It is disclosed (for example, see Patent Document 2). It is conceivable to use such a conventional technique for pulling out the cable protective material.

JP 2006-15704 A JP 2001-224112 A

  However, when the prior art is applied to the extraction of the cable protective material, there are the following problems. First, when pulling out the cable protective material, it is necessary to pull out only the cable protective material while leaving the existing cable in the pipeline. At this time, if the cable protective material is pulled out in its cylindrical shape using the conventional technique for pulling out the cable or the like from the pipeline, a large traction tension (for example, a force exceeding 25 kgf) is applied. There is a risk of damage. Furthermore, in the prior art, since the initial tension at the time of drawing becomes large, it is not possible to draw the cable in a long distance section with respect to a cable having a limited traction tension. That is, the prior art cannot be applied to a cable having a limited traction tension.

  The object of the present invention is to solve the above-mentioned problems and to attach an existing cable to protect an existing cable when performing quality control of the cable housing pipeline, such as when repairing the cable housing pipeline with a lining material. An object of the present invention is to provide a technique (a cable protection material extraction method and a cable protection material extraction jig) for extracting a protection material from a pipeline without damaging the cable.

In order to solve the above-described problem, a cable protective material (in order to protect the cable) is attached to the cable (in order to protect the cable) in the pipe line in which the cable is accommodated according to the present invention. The cable protective material pulling method for pulling out from the pipe)
Opening the tube of the cable protection member along the longitudinal direction of the cable (along the busbar of the tube of the cable protection material);
Separating the cable protection material (sheet-like) released in the releasing step from the cable;
Pulling out the cable protection member separated from the cable in the separating step from the pipe line,
The step of opening the tube of the cable protective material,
While releasing the fitting between the fitting part and the fitted part of the cable protection material by a cable tension relaxation jig configured to be able to insert the cable with the cable protection material attached thereto, the cable tension relaxation jig is Opening the tube of the cable protector by pulling in the pipeline along the cable,
Separating the cable protector from the cable,
A cable protection material separating jig configured to be able to be inserted through the cable protection material opened in the opening step, with the opened cable protection material inserted in the cable protection material separation jig (cable Separating the cable guard from the cable by towing along the cable)
It is characterized by including.

In addition, the cable tension relaxation jig according to the present invention has a barrel shape, and the barrel shape is provided with an insertion hole through which the cable with the cable protection member can be inserted in the longitudinal direction. The diameter of the barrel-shaped central portion is larger than the diameter of the barrel-shaped end portion in the longitudinal direction and smaller than the inner diameter of the conduit,
To a part of the barrel shape, a pulling means (tow rope) for pulling the cable tension relaxation jig is attached,
It is characterized by that.

Further, in the cable tension relaxation jig according to the present invention, the opening means for releasing the fitting between the fitting portion of the cable protection member and the fitted portion contacts the wall surface of the pipe line when the cable tension relaxation jig is pulled. It is attached to a part of the barrel shape (an end portion different from the pulling direction of the cable tension relaxation jig) while maintaining a distance that is not
It is characterized by that.

In addition, the cable tension relaxation jig according to the present invention can divide the barrel shape across both end surfaces of the barrel shape so that the cable on which the cable protective material is mounted can be inserted inside.
It is characterized by that.

Further, the cable protection material separating jig according to the present invention, a through hole through which the opened cable protection material can be inserted,
A tow means (tow rope) for towing the cable protection material separating jig,
It is characterized by that.

Moreover, the cable protection material separating jig according to the present invention is:
A retraction roller for facilitating retraction of the cable protection material into the insertion hole;
And at least one moving roller guided by the cable,
It is characterized by that.

Moreover, the cable protection material separating jig according to the present invention is:
A part of the outer wall forming the insertion hole includes a guide surface having an arcuate cross section guided by the cable, which is engageable with an outer peripheral surface of the cable.
It is characterized by that.

  The cable tension relaxation jig and the cable protection material separation jig may be integrated. For example, a cable protection material drawing jig according to the present invention is characterized in that the cable tension relaxation jig and the cable protection material separation jig are connected to each other with a predetermined distance therebetween.

  According to the present invention, when a cable housing pipeline is repaired with a lining material, the cable protective material attached to protect the existing cable when performing quality control of the cable housing pipeline is damaged to the cable. It is possible to pull out from the pipeline without any problem.

It is a figure explaining the procedure which covers a cable with the cable protection material 20 over the span full length of the cable which should be protected. 1 is a schematic view of a cable protection material 20. FIG. It is the schematic explaining the cable protection material extraction method by one Example of this invention. It is a figure which shows an example of a cable tension relaxation jig. It is a figure which shows a mode that the cable protection material 20 is open | released by the cable tension relaxation jig | tool 50 in the pipe line 2 in the sheet form. It is a figure which shows the 1st example of a cable protective material separation jig. It is a figure which shows the cable protection material separation jig 60 with which the cable 4 was equipped. It is a figure explaining a mode that the cable protection material 20 is isolate | separated from the cable 4 by the cable protection material isolation | separation jig 60 in the pipe line 2. FIG. It is a figure which shows the 2nd example of a cable protective material separation jig. It is a figure which shows the cable protection material isolation | separation jig 70 with which the cable 4 was equipped. It is a figure explaining a mode that the cable protection material 20 is isolate | separated from the cable 4 by the cable protection material separation jig 70 in the pipe line 2. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified diagram showing a pipeline equipped with a cable protection material to protect the cable when performing quality control of the cable accommodation pipeline such as repair using a lining material of the cable accommodation pipeline. is there. FIG. 1A is a cross-sectional view of the underground in which the pipe 2 is embedded, and FIG. 1B is a cross-sectional view of the pipe 2. In FIG. 1, 1 is the ground surface, 3a and 3b are manholes, 2 is a conduit, 4 is a cable, and 20 is a cable protective material. As shown in FIG. 1, when quality control of the cable housing pipe is performed, the cable is covered with the cable protection material 20 over the entire span length (for example, 150 m) of the cable 4 to be protected.

  Next, the cable protective material will be briefly described. FIG. 2 is a schematic view of the cable protection member 20. 2A shows a sheet-like cable protection member 20 before being attached to a cable, and FIG. 2B shows a part of a cylindrical cable protection member 20 that wraps a cable (not shown). The dimension in the width direction of the cable protection member 20 is large enough to wrap the cable 4 according to the inner diameter of the cable 4.

  As shown in FIG. 2A, the cable protection member 20 is provided with a fitted portion 10c and a fitted portion 10d on both sides in the width direction. When the cable protection member 20 is attached to the cable, the cable protection member 20 can be formed in a cylindrical shape so as to wrap the cable 4 by fitting the fitted portion 10c and the fitting portion 10d. In addition, the fitting means 24, the to-be-fitted part 10c, and the fitting part 10d are realizable with a fastener, for example. That is, the fitting means 24 can be a slider, and the fitted portion 10c and the fitting portion 10d can be elements. However, the present invention is not limited to this, and is not particularly limited as long as the fitted portion 10c and the fitting portion 10d can be fitted.

  The cable protection material described above must be removed after the repair of the pipeline 2 with the lining material, the cleaning of the pipeline 2, and the like are completed. At that time, if the cable protection member is pulled out from the tube port in a cylindrical shape as in the prior art, the traction tension increases due to the weight of the cable 4 and the cable 4 may be damaged. Therefore, according to the present invention, when the cable protective material is released in the form of a sheet by releasing the fitting of the cable protective material in the pipe, and the cable protective material opened in the sheet shape is pulled out, In order not to receive the cable, the cable protective material and the cable are separated, and the cable protective material is pulled out from the pipe port. FIG. 3 is a schematic view for explaining a cable protection material drawing method according to an embodiment of the present invention. As shown in FIG. 3, the cable protection material pulling method according to the embodiment of the present invention is configured such that the cable protection material 20 is opened in the pipe 2 by releasing the fitting of the cable protection material 20 with the cable tension relaxation jig 50. And a step of opening the cable to form a sheet (FIGS. 3A and 3B), and a step of separating the cable protective material 20 formed into a sheet from the cable 4 by the cable protective material separating jig 60 (FIG. 3C) And a step of pulling out the cable protection member 20 separated from the cable 4 from the pipe line 2. After the cable protection member 20 is pulled out from the pipeline 2, only the cable 4 can be left in the pipeline 2 as shown in FIG.

  The cable protection material drawing method shown in FIG. 3 will be described in detail below. First, a description will be given of a process of opening the cable protection material fitting and opening the cable protection material tube to form a sheet. FIG. 4 is a diagram illustrating an example of a cable tension relaxation jig used in the step of opening the tube of the cable protection material. 4 (a) and 4 (b) are a perspective view and a side view of the cable tension relaxation jig, respectively. As shown in FIG. 4, the cable tension relaxation jig 50 has a barrel shape 51, and the barrel shape 51 is provided with a through hole 52. As shown in FIG. 5, the insertion hole 52 can insert the cable 4 with the cable protection member 20 in the longitudinal direction. As shown in FIG. 4, the cable tension relaxation jig 50 preferably has a barrel shape 51 in which the diameter of the central portion of the barrel shape 51 in the longitudinal direction is larger than the diameter of the end portion of the barrel shape 51 in the longitudinal direction. is there. Moreover, the diameter of the center part of the barrel shape 51 in the longitudinal direction is made smaller than the inner diameter of the pipe line 2 or the lining pipe so that the inside of the pipe line 2 or the inside of the lining pipe can be pulled. Therefore, for example, but not limited to this, the diameter of the through hole 52 is 40 mm, the diameter of the central portion of the barrel shape 51 in the longitudinal direction is 60 mm, and the diameter of the end portion of the barrel shape 51 in the longitudinal direction is 50 mm. To do. The through hole 52 is not limited to a circular shape, and may be an elliptical shape. Further, in order to facilitate the pull-in of the cable 4 with the cable protection member 20 attached to the through hole 52, a bearing may be attached inside the through hole 52.

  When repairing the pipeline with the lining material, the cable protective material 20 is pulled out after the pipeline 2 is repaired with the lining material and then a repair success test such as a passage test of the lining pipe formed with the lining material. Done before. Therefore, the step of opening the tube of the cable protection member 20 using the cable tension relaxation jig 50 to form a sheet must be performed without damaging the cured lining material, that is, the lining pipe. For this reason, the cable tension relaxation jig 50 is preferably made of a material having a hardness equal to or less than that of the cured lining material. Examples of this material include vinyl chloride resin, Teflon (registered trademark), MC nylon, and the like. The length in the longitudinal direction of the cable tension relaxation jig 50 is a length that can be pulled in the bent pipe line 2 and is, for example, 85 mm or less.

  The cable tension relaxation jig 50 further connects a pulling rope (pulling means) 55 for pulling the cable tension relaxation jig 50 in the pipe line 2, an opening means 57, an opening means 57 and a part of the barrel shape 51. And a connecting rope (connecting means) 56. The opening means 57 is a means capable of releasing the fitting between the fitted portion 10c and the fitting portion 10d of the cable protection member 20. For example, the opening means 57 is realized by a slider when the fitted portion 10c and the fitted portion 10d are fastener elements.

  Further, the barrel shape 51 can be divided across both end surfaces of the barrel shape 51 so that the cable 4 with the cable protection member 20 mounted in the insertion hole 52 can be inserted. In the example of FIG. 4, the barrel shape 51 can be halved by a cutting line 53 extending over both end faces. In this case, the screw hole 54 is provided in the barrel shape 51, and the barrel shape 51 is prevented from being half-cut unnecessarily by the screw.

  Next, the advantage that the cable tension relaxation jig 50 is formed in a barrel shape will be described together with the state in which the cable protection material 20 is opened in a sheet shape by the cable tension relaxation jig 50 in the pipe line 2. FIG. 5 is a diagram illustrating a state in which the cable protection member 20 is released into a sheet shape by the cable tension relaxation jig 50 in the pipe line 2. Although not shown in FIG. 5, when the cable protection member 20 attached to the cable is pulled out when the pipe 2 is repaired with a lining material, a lining pipe is formed inside the pipe 2. First, as shown in FIG. 5A, at the end of the cable protection member 20, the cable tension relaxation jig 50 is inserted into the insertion hole 52 through the cable 4 to which the cable protection member 20 is attached. Attach to cable 4. At this time, as shown in FIG. 5A, the opening means 57 releases the fitting between the fitted portion 10 c and the fitting portion 10 d of the cable protection material 20. And as shown in FIG.5 (b), the cable tension | tensile_strength relaxation jig 50 is pulled to the direction of an arrow using a pulling rope. In FIG. 5, the tow rope 55 is omitted for the sake of clarity. The tow rope 55 can be pulled with a force of 25 kgf or less, for example, using a hand-drawing or a towing machine (not shown). As shown in FIG. 5B, when the cable tension relaxation jig 50 is pulled, the release means 57 releases the fitting of the cable protection member 20, and the tube of the cable protection member 20 extends along the bus. Opened.

  In addition, the fitting part of the cable protection material 20 may be pinched | interposed between the cable 4 and the pipe line 2 or the inner wall of a lining pipe | tube. In such a case, the fitting portion of the opening means 57 and the cable protection member 20 receives a large weight due to the weight of the cable 4, and the cable 4, the pipe line 2 or the lining pipe is damaged, and the opening means 57 is broken. In order to cope with this problem, in the present invention, in order to float the cable 4 from the pipe line 2 or the inner wall of the lining pipe, the cable tension relaxation jig 50 has a barrel shape. By making the barrel shape in this way, as shown in FIG. 5B, a space where the cable 4 does not contact the pipe line 2 or the inner wall of the lining pipe can be created before and after the cable tension relaxation jig 50. Therefore, if the length of the connecting rope 56 that connects the opening means 57 and a part of the barrel shape 51 is the length at which the opening means 57 is located in this space, the weight of the cable 4 is applied to the opening means 57 and the cable 4. The fitting of the cable protection member 20 can be released in a state where it is not applied. In other words, the cable tension relaxation jig plays a role of relaxing the tension applied when the cable protection material 20 is released and the cable protection material 20 is released. And as shown in FIG.5 (c), after the cable tension | tensile_strength relaxation jig 50 advances the inside of the pipe line 2 or a lining pipe | tube, it will be in the state by which the cable protection material 20 was open | released in the sheet form.

  Next, a process of separating the cable protection material 20 formed into a sheet shape by the above-described process from the cable 4 will be described. First, the necessity of the process of separating the cable protection material 20 from the cable 4 will be described. As shown in FIG. 5C, when the cable protection member 20 is opened in a sheet shape by the cable tension relaxation jig 50, the cable protection member 20 is sandwiched between the cable 4 and the inner wall of the pipe line 2 or the lining pipe. It may be in a state. If the cable protection member 20 is pulled out from the pipe line 2 or the lining pipe in such a state, the cable 4 or the lining pipe may be damaged due to its own weight. Therefore, in order to enable the cable protection member 20 to be pulled out without damaging the cable 4 and the lining pipe, the cable protection member 20 and the cable 4 are separated as described below.

  FIG. 6 is a diagram illustrating a first example of a cable protection material separating jig used in the process of separating the cable protection material 20 from the cable 4. 6A, 6B, and 6C are a perspective view, a side view, and a front view, respectively, of a first example of a cable protection material separating jig. As shown in FIG. 6, the cable protection material separating jig 60 includes a through hole 61 through which the cable protection material 20 can be inserted. The cable protection material separation jig 60 moves the cable protection material separation jig 60 along the pulling roller 62 and the cable 4 that facilitates the pulling of the cable protection material 20 into the through hole 61, that is, guides by the cable 4. A moving roller 63 and a traction rope (traction means) 64 are provided. Although the penetration hole 61 should just be able to penetrate the cable protection material 20, it can be 20 mm in diameter as an example. The through hole 61 is not limited to a circular shape, and may be an elliptical shape. Further, the length in the longitudinal direction of the cable protection material separating jig 60 is a length that can be pulled in the bent pipe line 2 in the same manner as the length of the cable tension relaxation jig 50, for example, 85 mm. As an example, the diameter of the drawing roller and the moving roller is 10 mm, and the length of the cable protection material separating jig 60 in the width direction is 65 mm. The height of the cable protection material separation jig 60 is 10 mm at the end of the cable protection material separation jig 60 in the traveling direction, that is, the end to which the traction rope 64 is attached, and 30 mm at the other end.

  Next, a method for separating the cable protection material 20 and the cable 4 by the cable protection material separation jig 60 will be described. FIG. 7 is a view showing a cable protection material separating jig 60 provided in the cable 4. As shown in FIG. 7, when the cable protection member 20 is separated from the cable 4, the cable protection member 20 is passed through the insertion hole 61 of the cable protection member separation jig 60 and the moving roller 63 is brought into contact with the cable 4. When the cable protection material separation jig 60 is pulled in the direction of the arrow shown by a tow rope (not shown), the cable protection material 20 is drawn into the through hole 61 and the traveling direction of the cable protection material separation jig 60 is reached. The cable protection member 20 is sent out from the end of the rear insertion hole 61 in a state separated from the cable 4. Therefore, after the cable protection material separating jig 60 has been advanced, the cable protection material 20 is not sandwiched between the cable 4 and the pipe 2 or the inner wall of the lining pipe, but is separated from the cable 4.

  Next, a state in which the cable protection material 20 is separated from the cable 4 by the cable protection material separation jig 60 in the pipe line 2 will be described with reference to FIG. Although not shown in FIG. 8, when the cable protection member 20 attached to the cable is pulled out when the pipe 2 is repaired with a lining material, a lining pipe is formed inside the pipe 2. First, as shown in FIG. 8A, the cable protection member 20 is inserted into the insertion hole 61 of the cable protection member separation jig 60 at the end of the cable protection member 20, and the description has been made with reference to FIG. The cable 4 is provided with a cable protective material separating jig 60. Then, as shown in FIG. 8B, the cable protection material separating jig 60 is pulled in the direction of the arrow by using the pulling rope. In FIG. 8, the traction rope 64 is omitted for the sake of clarity. The tow rope 64 can be pulled using, for example, a hand-drawing or a towing machine (not shown). At this time, the friction between the cable 4 and the cable protection material separating jig 60 can be reduced by the moving roller 63.

  After the cable protective material separating jig 60 has advanced in the pipe line 2 or the lining pipe, the cable protective material 20 is separated from the cable 4 without being sandwiched between the cable 4 and the pipe 2 or the inner wall of the lining pipe. It becomes. Then, after the cable protective material 20 is separated from the cable 4 using the cable protective material separating jig 60, the cable protective material 20 is pulled out from the pipe port, and only the cable 4 is connected to the pipe line 2 as shown in FIG. Or it can remain in the lining tube. Unlike the prior art in which the cable protection member 20 is pulled out in a cylindrical shape at the time of pulling out, the cable protection member 20 does not receive the weight of the cable 4, so that the necessary traction tension can be reduced. Therefore, according to the present invention, the cable protection material can be pulled out from the pipe line without damaging the cable 4 or the lining pipe.

  6 shows an example in which the cable protection material separating jig 60 is tapered toward the pulling direction, that is, the end to which the pulling rope 64 is attached, but the present invention is not limited to this. Any shape can be used as long as the cable protection member 20 can be drawn into the through hole 61. The cable protective material separating jig 60 is preferably made of a material that has low friction with the cable 4 and that does not easily damage the cable 4 or the lining pipe. For example, vinyl chloride resin, MC nylon, or Teflon (registered trademark) ) Etc.

  Next, a second example of the cable protection material separating jig will be described. FIG. 9 is a view showing a second example of the cable protection material separating jig. 9A and 9B are a perspective view and a cross-sectional view, respectively, of a second example of the cable protection material separating jig. As shown in FIG. 9, the cable protection material separating jig 70 includes a through hole 71 through which the cable protection material 20 can be inserted, and a tow rope (tow means) 74. Further, a part of the outer wall 72 that forms the through hole 71 is engageable with the outer peripheral surface of the cable 4, and is guided by the cable 4 by being engaged with the cable 4. It has become. The length of the cable protective material separating jig 70 in the longitudinal direction is set to be, for example, 85 mm or less, which can correspond to the bending of the pipe line 2, similarly to the cable protective material separating jig 60.

  Next, a method for separating the cable protection material 20 and the cable 4 by the cable protection material separation jig 70 will be described. FIG. 10 is a diagram showing a cable protection material separating jig 70 provided in the cable 4. As shown in FIG. 10, when the cable protection member 20 is separated from the cable 4, the cable protection member 20 is passed through the insertion hole 71 of the cable protection member separation jig 70 and the guide surface 73 is engaged with the cable 4. When the cable protection material separating jig 70 is pulled in the direction of the arrow shown in FIG. 10 by a tow rope (not shown), the cable protection material 20 is drawn into the through hole 71, and the cable protection material separating jig 70 The cable protection member 20 is sent out in a state separated from the cable 4 from the end of the through hole 71 at the rear in the traveling direction. Therefore, after the cable protection material separating jig 70 has advanced, the cable protection material 20 is not sandwiched between the cable 4 and the inner wall of the pipe line 2 or the lining pipe, and is separated from the cable 4.

  Next, a state in which the cable protection material 20 is separated from the cable 4 by the cable protection material separation jig 70 in the pipe line 2 or the lining pipe will be described with reference to FIG. Although not shown in FIG. 11, when the cable protection member 20 attached to the cable is pulled out when the pipe 2 is repaired with a lining material, a lining pipe is formed inside the pipe 2. First, as shown in FIG. 11A, the cable protection material is inserted into the insertion hole 71 of the cable protection material separation jig 70 at the end of the cable protection material 20, and as described with reference to FIG. The cable 4 is provided with a cable protection material separating jig 70. Then, as shown in FIG. 11B, the cable protection material separating jig 70 is pulled in the direction of the arrow using a pulling rope (not shown).

  After the cable protective material separating jig 70 has advanced in the pipe line 2 or the lining pipe, the cable protective material 20 is separated from the cable 4 without being sandwiched between the cable 4 and the pipe 2 or the inner wall of the lining pipe. It becomes. Then, after the cable protective material 20 is separated from the cable 4 using the cable protective material separating jig 70, the cable protective material is pulled out from the pipe port, and only the cable 4 is connected to the pipe line 2 or the cable as shown in FIG. Can remain in the lining tube. Even at the time of drawing, the cable protective material 20 does not receive the weight of the cable 4 for the same reason as described for the cable protective material separating jig 60. According to the present invention, the cable 4 and the lining pipe are not damaged. It is possible to pull out the cable protection material from the pipeline.

  As described above, the cable 4 and the lining pipe immediately after curing are damaged without receiving the weight of the cable 4 by the process of opening the tube of the cable protection material and the process of separating the opened cable protection material from the cable. The cable protection member 20 can be pulled out from the pipeline. In the above-described embodiment, the case where the cable tension relaxation jig 50 and the cable protection material separating jigs 60 and 70 are separated and the cable protection material is separated from the cable after all the cable protection materials are opened has been described. However, the present invention is not limited to this, and the cable tension relaxation jig 50 and the cable protection material separating jig 60 or 70 can be connected to be realized as a single cable protection material drawing tool. In this case, it is possible to separate the cable protective material from the cable while releasing the fitting of the cable protective material into a sheet shape, and the time required for the cable protective material extraction process can be shortened. In addition, when connecting the cable tension | tensile_strength relaxation jig | tool 50 and the cable protection material isolation | separation jig | tool 60 or 70, it is preferable to leave | separate only predetermined distance so that it may respond | correspond to the bending of the pipe line 2. FIG.

  The advantages of the present invention will be described again. According to the present invention, the cable protection member can be pulled out from the pipe line without receiving the weight of the cable 4 and damaging the cable 4 and the lining pipe. In addition, since the cable protective material and the cable are separated when the cable protective material is pulled out, the initial tension when the cable protective material is pulled out is low, and the cable protective material can be pulled out even if the cable protective material is pulled out long.

  Although the present invention has been described based on the drawings and examples, those skilled in the art can make various modifications based on the present disclosure. For example, each component can be rearranged so as not to be logically contradictory, and a plurality of components can be combined into one or divided. In the above-described embodiment, the case where the cable protective material attached when the inside of the pipe line is repaired with the lining material is shown, but it should be noted that the present invention is not limited to this. For example, processing to maintain and maintain the quality of the pipeline, such as applying corrosion / rust-preventing material to the inner wall of the pipeline containing the cable, repainting the pipeline, or cleaning the pipeline The present invention can be applied to all cases where it is necessary to protect a cable in a pipe line and other cases where a cable protection material is attached to the cable. In addition, the dimensions of the jigs shown in the above-described embodiments are merely examples, and can be appropriately changed according to the inner diameter of the pipeline, the shape of the cable, the thickness of the cable protective material, and the bending of the pipeline. Furthermore, the opening means of the cable tension relaxation jig is not limited to the above-described embodiment as long as it can release the fitting of the cable protective material.

1 Ground 2 Pipe line (protection pipe)
3a, 3b Manhole 4 Cable 10c Fitted part 10d Fitting part 20 Cable protective material 50 Cable tension relaxation jig 51 Barrel shape 52 Insertion hole 53 Cutting line 54 Screw hole 55 Tow rope (traction means)
56 Connection rope (connection means)
57 Opening means 60 Cable tension relaxation jig 61 Insertion hole 62 Pull-in roller 63 Moving roller 64 Towing rope (towing means)
70 Cable protective material separating jig 71 Through hole 72 Outer wall 73 Guide surface 74 Tow rope (traction means)

Claims (8)

A cable protective material pulling method for pulling out a cable protective material, which is attached to the cable in a cylindrical shape, from the pipe in a pipe containing an internal cable,
Opening the cable protector tube along the longitudinal direction of the cable;
Separating the cable protection member opened in the releasing step from a cable;
Pulling out the cable protector separated in the separating step from the pipeline,
The step of opening the tube of the cable protective material,
While releasing the fitting between the fitting part and the fitted part of the cable protection material by a cable tension relaxation jig configured to be able to insert the cable with the cable protection material attached thereto, the cable tension relaxation jig is Opening the tube of the cable protector by pulling in the pipeline along the cable,
Separating the cable protector from the cable,
A cable protective material separating jig configured to be able to be inserted through the cable protective material opened in the releasing step, along the cable in a state where the opened cable protective material is inserted into the cable protective material separating jig. Separating the cable protector from the cable by towing
A method for pulling out cable protective material. A cable tension relaxation jig used in the cable protection material drawing method according to claim 1,
The cable tension relaxation jig has a barrel shape, and the barrel shape is provided with an insertion hole through which the cable with the cable protection member is inserted in the longitudinal direction, and the barrel shape in the longitudinal direction is provided. The diameter of the central part of the pipe is larger than the diameter of the barrel-shaped end in the longitudinal direction and smaller than the inner diameter of the pipe line,
A pulling means for pulling the cable tension relaxation jig is attached to a part of the barrel shape.
A cable tension relaxation jig characterized by that. In the cable tension relaxation jig of Claim 2,
An opening means for releasing the fitting between the fitting portion and the fitted portion of the cable protection member maintains a distance that does not contact the wall surface of the pipe line when the cable tension relaxation jig is pulled, Can be attached to a part,
A cable tension relaxation jig characterized by that. In the cable tension relaxation jig according to claim 2 or 3,
The barrel shape can be divided across both end surfaces of the barrel shape so that the cable with the cable protection member can be inserted therein.
A cable tension relaxation jig characterized by that. A cable protection material separating jig used in the cable protection material drawing method according to claim 1,
An insertion hole through which the opened cable protective material can be inserted; and
Traction means for towing the cable protection material separation jig,
Cable protective material separation jig characterized by that. In the cable protection material separation jig according to claim 5,
A retraction roller for facilitating retraction of the cable protection material into the insertion hole;
And at least one moving roller guided by the cable,
Cable protective material separation jig characterized by that. In the cable protection material separation jig according to claim 5,
A part of the outer wall forming the insertion hole includes a guide surface having an arcuate cross section guided by the cable, which is engageable with an outer peripheral surface of the cable.
Cable protective material separation jig characterized by that.   A cable protection material pulling jig comprising the cable tension relaxation jig according to claim 2 and the cable protection material separating jig according to claim 5 that are separated from each other by a predetermined distance.

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