JP6974825B2 - Cable removal method - Google Patents

Description

The present invention relates to cable removal how.

Patent Document 1 discloses a technique of inserting a tubular member between a pipeline buried in the ground and a cable, peeling the cable from the pipeline, and then pulling out the cable from the pipeline.

Japanese Unexamined Patent Publication No. 2016-163387

In the technique disclosed in Patent Document 1, even if the cable can be pulled off from the pipeline, it is necessary to apply an excessive pulling force to the cable in order to pull out the cable from the pipeline.

SUMMARY OF THE INVENTION In view of the above, without the addition of excessive pulling force to the cable, and to provide a cable removal how that can remove the cable from the ground buried conduit.

The cable removing method of the first aspect of the present invention is a cable removing method for removing a cable inserted into a pipeline arranged underground from the pipeline, and is a method of removing the inner peripheral wall of the pipeline and the cable. It has a cutting step of inserting a cutting tool between the outer peripheral surface and cutting the cable in the radial direction, and a taking-out step of taking out the cut cable from the pipeline, and the cutting step and the taking-out step. By alternately repeating the above steps, the cable is taken out from the pipeline while being divided in the longitudinal direction, and the cable is removed from the pipeline.

In the cable removing method of the first aspect, the cable is lengthened by alternately repeating the cutting step of cutting the cable in the radial direction with a cutting tool and the taking-out step of taking out the cut cable from the pipeline arranged underground. The cable is removed from the pipeline by being taken out of the pipeline while being divided into predetermined lengths in the direction.
Here, in the above cable removal method, as compared with the method of pulling out one cable from the manhole and the pipeline connecting the manholes, the cable is divided in the longitudinal direction without applying an excessive pulling force to the cable. The cable can be removed from the pipeline by repeating the work of removing it from the route.

The cable removing method according to the second aspect of the present invention is the cable removing method according to the first aspect. The cable is cut in the radial direction by the cutting tool in a state where the outer peripheral surface of the cable is separated from the inner peripheral wall of the pipeline by inserting the cable between the two.

In the cable removing method of the second aspect, the cable is separated from the inner peripheral wall of the pipeline by a tubular member inserted between the inner peripheral wall of the pipeline and the outer peripheral surface of the cable, and the cable is separated from the outer peripheral surface of the cable by a cutting tool. In order to cut the cable in the radial direction, for example, compared to a configuration in which the cable is cut with the outer peripheral surface of the cable in contact with the inner peripheral wall of the pipeline, the cable is cut without touching the inner peripheral wall of the pipeline with a cutting tool. can do.
Further, since the outer peripheral surface of the cable is separated from the inner peripheral wall of the pipeline by inserting the tubular member, the cable can be surely peeled off from the pipeline even if the cable is fixed to the pipeline. As a result, the cable cut (divided in the longitudinal direction) by the cutting tool can be easily taken out from the pipeline.

In the cable removing method of the third aspect of the present invention, in the cable removing method of the second aspect, the tubular member is inserted into the pipeline by a propulsion device arranged outside the pipeline, and the cutting tool is used. It is linear and endless, is housed in an annular groove formed along the circumferential direction on the inner peripheral surface of the tubular member, and is circulated and driven by a drive device. The cutting tool is circulated and driven while reducing the diameter of the annular portion housed in the groove portion to form an annular portion, thereby cutting the cable in the radial direction.

In the cable removing method of the third aspect, the cutting tool is circulated and driven while reducing the diameter of the annular portion housed in the groove portion of the cutting tool to gradually cut the cable in the radial direction. Here, in the above-mentioned cable removing method, since the cutting tool is circulated and driven with respect to the tubular member to cut the cable, for example, as compared with the embodiment in which the cutting tool is rotated together with the tubular member to cut the cable, the pipe is cut. It is possible to suppress the occurrence of defects (for example, scratches) on the inner peripheral wall of the road.

In the cable removing method of the fourth aspect of the present invention, in the cable removing method of the second aspect, the tubular member is inserted into the pipeline by a propulsion device arranged outside the pipeline and around the axis. The cutting tool is made rotatable and linear, and is housed in an annular groove formed along the circumferential direction on the inner peripheral surface of the tubular member. In the cutting step, the cylinder is provided by the propulsion device. While rotating the shaped member, the cutting tool is pulled out from the groove portion to cut the cable in the radial direction.

In the cable removing method of the fourth aspect, the linear cutting tool is pulled out from the groove portion while the tubular member is rotated by the propulsion device, and the cable is gradually cut in the radial direction. Here, in the cable removing method, since the cutting tool is rotated together with the tubular member to cut the cable, the cable can be cut in the radial direction with a simple device configuration.

In the cable removing method of the fifth aspect of the present invention, in the cable removing method of the third aspect or the fourth aspect, the propulsive force is transmitted to the tubular member from the shaft connected to the propulsion device. Attitude control means capable of controlling the posture of the tubular member in the pipeline by tilting the axial center of the tubular member with respect to the axial center of the shaft between the tubular member and the shaft. Is provided.

In the cable removing method of the fifth aspect, the propulsive force is transmitted from the shaft connected to the propulsion device, and the tubular member is inserted into the pipeline. Here, since the tubular member can control the posture of the tubular member in the pipeline by inclining the axial center of the tubular member with respect to the axial center of the shaft by the attitude control means, for example. , Even if the pipeline is bent, the tubular member can be inserted into the pipeline. Further, for example, even when there is a step at the joint of a plurality of pipes constituting the pipeline, the tubular member can be inserted while avoiding the step.

The cable removing method according to the sixth aspect of the present invention is the cable removing method according to any one of the second to fifth aspects, in which the inner peripheral surface of the tubular member is in contact with the outer peripheral surface of the cable. A plurality of rotating inner rotating members are provided, and a plurality of outer rotating members that rotate in contact with the inner peripheral wall of the pipeline are provided on the outer peripheral surface of the tubular member.

In the cable removing method of the sixth aspect, since a plurality of inner rotating members are provided on the inner peripheral surface of the tubular member and a plurality of outer rotating members are provided on the outer peripheral surface of the tubular member, the inner peripheral wall of the pipeline and the outer peripheral surface of the cable are provided. It is possible to reduce the frictional resistance when inserting the tubular member between the surface and the surface.

The cable removing device of the seventh aspect of the present invention is a cable removing device for removing a cable inserted into a pipeline arranged underground from the pipeline, and is a cable removing device for the inner peripheral wall of the pipeline and the cable. It includes a tubular member inserted between the outer peripheral surface and a cutting tool built in the tubular member and cutting the cable in the radial direction.

In the cable removing method of the seventh aspect, first, a tubular member is inserted between the inner peripheral wall of the pipeline and the outer peripheral surface of the cable, and the cable is cut in the radial direction by a cutting tool built in the tubular member. .. Next, the tubular member is pulled out of the pipeline, and the cut cable in a state of being placed on the inner peripheral surface of the tubular member is taken out from the pipeline. By repeating these operations alternately, the cable is taken out from the pipeline while being divided into a predetermined length in the longitudinal direction, and the cable is removed from the pipeline.
Here, in the cable removing device, as compared with a device that pulls out one cable from a manhole and a pipeline connecting the manhole, the cable is divided in the longitudinal direction without applying an excessive pulling force to the cable. The cable can be removed from the pipeline by repeating the work of removing it from the route.
Further, in the cable removing device, since the tubular member is inserted between the inner peripheral wall of the pipeline and the outer peripheral surface of the cable, the outer peripheral surface of the cable is separated from the inner peripheral wall of the pipeline. That is, even if the cable is fixed to the pipeline, the cable can be reliably pulled off from the pipeline by inserting the tubular member. As a result, the cable cut in the radial direction (divided in the longitudinal direction) with the cutting tool can be easily taken out from the pipeline.

The present invention, without the addition of excessive pulling force to the cable, it is possible to provide a cable removal how that can remove the cable from the ground buried conduit.

(A) It is sectional drawing for demonstrating the outline of the cable removal method which concerns on one Embodiment of this invention. (B) The part A of FIG. 1 (A) is shown, and is the enlarged sectional view for demonstrating the cable cutting process. (C) Part A of FIG. 1 (A) is shown, and is an enlarged cross-sectional view for explaining a cable take-out process. (A) It is sectional drawing for demonstrating the 2nd cable cutting process after the cable taking-out process in FIG. 1C. (B) It is sectional drawing for demonstrating the 2nd cable take-out process after the 2nd cutting process. It is a side view of the apparatus which shows the schematic structure of the cable removal apparatus used in the cable removal method which concerns on one Embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line 4X-4X of FIG. 5 is a cross-sectional view taken along the line 5X-5X of FIG. FIG. 6 is a cross-sectional view taken along the line 6X-6X of the arrow in FIG. 4 is a cross-sectional view taken along the line 7X-7X of FIG. It is a side view of the device which shows the shaft connection part of the cable removal device. It is explanatory drawing for demonstrating the cable cutting operation of the cable removal apparatus (the sectional view corresponding to FIG. 4). It is a perspective view which shows the state before the cable cutting of the cable removal device. It is a perspective view which shows the state in the process of cutting a cable of a cable removal device. It is a perspective view which shows the state after the cable cutting of a cable removal device. It is a side view of the peeling unit which shows the state which attached the peeling unit to the shaft tip part of a cable removal device, and is the partially enlarged view of the side surface part. It is sectional drawing in the direction orthogonal to the axial direction of the peeling unit (cylindrical member) shown in FIG. It is explanatory drawing for demonstrating the cable cutting operation of the cable removal apparatus of the modification (the cross-sectional view corresponding to FIG. 4). It is explanatory drawing for demonstrating the cable cutting operation of the cable removal apparatus of the modification (the cross-sectional view corresponding to FIG. 4). It is explanatory drawing for demonstrating the cable cutting operation of the cable removal apparatus of the modification (the cross-sectional view corresponding to FIG. 4).

Hereinafter, the cable removing method and the cable removing device according to the embodiment of the present invention will be described.

As shown in FIG. 1A, the cable removing method of the present embodiment is for removing the cable 104 (for example, a power cable) inserted into the pipeline 102 connecting the manholes 100 from the inside of the pipeline 102. It is the method of. In the cable removing method of the present embodiment, the cable removing device 20 (hereinafter, appropriately referred to as “removing device 20”) is used for removing the cable 104 from the pipeline 102. In the following, first, the outline of the cable removing method will be described, then the configuration of the removing device 20 will be described, and then the cable removing method using the removing device 20 will be described.

<Cable removal method>
As shown in FIGS. 1 (A) to 1 (C) and FIGS. 2 (A) and 2 (B), the cable removing method of the present embodiment is a cutting step of the cable 104 (hereinafter, appropriately “cutting step”). It has a take-out step (take-out step) of the cut cable 104S.

As shown in FIG. 1 (B), in the cutting step, a cutting tool (cutting tool 44 in the removal device 20 described later) is inserted between the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface 104A of the cable 104. , Cut the cable 104 in the radial direction. In FIG. 1B, the cutting line of the cable 104 is indicated by an arrow CL. Further, the cutting tool is not particularly limited as long as it can cut the cable 104 in the radial direction and divide the cable 104 in the longitudinal direction.

Next, as shown in FIG. 1C, in the take-out step, the cut cable 104S is taken out from the pipeline 102. The method of taking out the cut cable 104S from the pipeline 102 is not particularly limited.

Next, as shown in FIG. 2A, a cutting tool is inserted again between the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface 104A of the cable 104 to cut the cable 104 in the radial direction.

Then, as shown in FIG. 2B, the cut cable 104S is taken out from the pipeline 102.

In this way, by alternately repeating the cutting step and the taking-out step, the cable 104 can be taken out from the pipeline 102 while being divided in the longitudinal direction, and the cable 104 can be removed from the conduit 102.

In the cable removing method of the present embodiment, the cable 104 is cut in the longitudinal direction by alternately repeating the cutting step of cutting the cable 104 in the radial direction with a cutting tool and the taking-out step of taking out the cut cable 104 from the pipeline 102. The cable 104 is taken out from the conduit 102 while being divided into a predetermined length, and the cable 104 is removed from the conduit 102.
Here, in the cable removing method, as compared with the method of pulling out one cable 104 from the pipe line 102 connecting the manhole 100 and the manhole 100, the cable 104 is lengthened without applying an excessive pulling force to the cable 104. The cable 104 can be removed from the conduit 102 by repeating the work of taking out the cable 102 from the conduit 102 while dividing the cable 104 in the direction.

<Cable removal device>
The cable removing device 20 of the present embodiment will be described with reference to FIGS. 3 to 9.

As shown in FIGS. 3 to 5, the removing device 20 has a tubular member 22 and a cutting tool 44.

The tubular member 22 has a cylindrical shape and is inserted between the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface 104A of the cable 104. The inner surface 22A at the tip of the tubular member 22 in the insertion direction (direction of arrow I) is a reverse tapered surface that is inclined so that the inner diameter of the tubular member 22 increases in the insertion direction.

An annular groove portion 23 extending along the circumferential direction of the tubular member 22 is formed on the inner peripheral surface 22B of the tubular member 22. Further, the inner peripheral surface 22B is formed with a groove portion 24 extending linearly from the groove portion 23 toward the side opposite to the insertion direction of the tubular member 22. As shown in FIGS. 4 and 7, a cutting tool 44 is housed in the groove 23 and the groove 24. A pair of pulleys 25 are arranged at the confluence portion of the groove portion 24 with the groove portion 23, and the cutting tool 44 extends from the groove portion 24 to the groove portion 23 via these pulleys 25.

A plurality of balls 26 as an example of the inner rotating member that rotates in contact with the outer peripheral surface 104A of the cable 104 are embedded in the inner peripheral surface 22B of the tubular member 22.

A plurality of balls 28 as an example of an outer rotating member that rotates in contact with the inner peripheral wall 102A of the pipeline 102 are embedded in the outer peripheral surface 22C of the tubular member 22.

Further, a CCD camera 30 is embedded in the tip surface 22D of the tubular member 22. In this embodiment, the CCD cameras 30 are embedded at four locations at equal intervals in the circumferential direction of the tubular member 22. The image taken by the CCD camera 30 is displayed on a monitor (not shown) installed outside the entrance of the conduit 102 (inside the manhole 100) through the image processing unit 36 described later.

Further, a columnar control unit 38 including an attitude control unit 32, a drive control unit 34, and an image processing unit 36 is connected to the end portion side opposite to the insertion direction of the tubular member 22. It is connected to a shaft 52 extending from the propulsion device 50 via the control unit 38. When the shaft 52 rotates, the tubular member 22 rotates together with the control unit 38.

The attitude control unit 32 is a portion that controls the posture of the tubular member 22 by tilting the axial center of the tubular member 22 with respect to the axial center of the shaft 52. Here, by operating the attitude control unit 32 to incline the axial center of the tubular member 22 with respect to the axial center of the shaft 52, the tubular member 22 can be inserted into the bent portion of the pipeline 102. can. Further, even if there is a step at the joint of a plurality of pipes constituting the pipeline 102, the tubular member 22 can be inserted while avoiding the step.

The drive control unit 34 includes a drive device 40 for circulatingly driving the cutting tool 44, and a moving device 42 for moving the driving device 40 to apply tension to the cutting tool 44. The drive device 40 includes a rotating member 40A around which the cutting tool 44 is wound, and a motor 40B that rotates the rotating member 40A to circulate and drive the cutting tool 44. Further, the moving device 42 is configured to move the driving device 40 in a direction opposite to the insertion direction of the tubular member 22. As the drive source of the moving device 42, for example, a motor, an air cylinder, or a hydraulic cylinder may be used.

The image processing unit 36 transmits the image information taken by the CCD camera 30 to a monitor (not shown) installed outside the entrance of the conduit 102 (inside the manhole 100). In the present embodiment, the operator operates the posture control unit 32 with, for example, the controller for the posture control unit 32 based on the image displayed on the monitor.

A propulsion device 50 is arranged outside the entrance of the pipeline 102 (inside the manhole 100). The propulsion device 50 can rotate the main body 56 that moves on the rail 54 fixed to the floor surface of the manhole 100, the hydraulic cylinder 58 that moves the main body 56 along the rail 54, and the shaft 52 connected to the main body 56. It is provided with a rotation support portion 60 that supports the cylinder. By this propulsion device 50, the tubular member 22 connected to the tip of the shaft 52 is inserted (press-fitted) between the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface 104A of the cable 104.

The cutting tool 44 is linear and endless. The cutting tool 44 is housed in the groove portion 23 and the groove portion 24, and a part of the cutting tool 44 is wound around the rotating member 40A of the drive device 40. The cutting tool 44 is circulated and driven by the rotation of the rotating member 40A. In the present embodiment, a wire saw is used as the cutting tool 44, but the present invention is not limited to this configuration. For example, a chainsaw or a band saw may be used.

Further, the openings of the groove 23 and the groove 24 for accommodating the cutting tool 44 are each closed by the packing member 46. The packing member 46 can prevent the cutting tool 44 housed in the groove portion 23 and the groove portion 24 from falling out of the groove, and is easily destroyed by the circulation drive of the cutting tool 44, or falls out of the groove. It is preferable to use a member. For example, a foaming material (Styrofoam) may be used.

<Cable removal method using the cable removal device 20>
A cable removal method using the removal device 20 of the present embodiment will be described.

First, the end of the cable 104 extending from the pipeline 102 is cut at the pipeline entrance.

Next, the propulsion device 50 is installed in the manhole 100, one end of the shaft 52 is connected to the rotation support portion 60, and the tubular member 22 is connected to the other end via the control unit 38. Then, the tip of the tubular member 22 is press-fitted between the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface 104A of the cable 104 by the propulsive force of the propulsion device 50 (pressing pressure of the hydraulic cylinder). By this press fitting, the outer peripheral surface 104A of the cable 104 is separated from the inner peripheral wall 102A of the pipeline 102. Here, since a plurality of balls 26 are provided on the inner peripheral surface 22B of the tubular member 22 and a plurality of balls 28 are provided on the outer peripheral surface 22C of the tubular member 22, the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface of the cable 104 are provided. The frictional resistance when the tubular member 22 is inserted between the 104A and the 104A can be reduced.

Then, the cable 104 is cut in the radial direction by the cutting tool 44 in a state where the outer peripheral surface 104A of the cable 104 is separated from the inner peripheral wall 102A of the pipeline 102. Specifically, as shown in FIG. 10, while the drive device 40 is operated to circulate and drive the cutting tool 44, the driving device 40 is moved by the moving device 42 to increase the tension acting on the cutting tool 44. go. As a result, the packing member 46 falls off or is destroyed from the groove 23. Then, the diameter of the annular portion 44A housed in the groove portion 23 of the cutting tool 44 and formed into an annular shape is reduced as shown in FIGS. 9 and 11. The cable 104 is radially cut by the reduced diameter annular portion 44A. After cutting the cable 104, the entire cutting tool 44 fits within the groove 24, as shown in FIG.

Here, in the cable removal method using the removal device 20, the cutting tool 44 is circulated and driven with respect to the tubular member 22 to cut the cable 104. Therefore, for example, the cutting tool 44 is rotated together with the tubular member 22. Compared with the form of cutting the cable 104, it is possible to suppress the occurrence of defects (scratches as an example) on the inner peripheral wall 102A of the pipeline 102.

Further, in the cable removing method, the outer peripheral surface 104A of the cable 104 is separated from the inner peripheral wall 102A of the pipeline 102 by the tubular member 22 inserted between the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface 104A of the cable 104. In this state, the cable 104 is cut in the radial direction by the cutting tool 44, so that the cable 104 is cut in a state where the outer peripheral surface 104A of the cable 104 is in contact with the inner peripheral wall 102A of the pipe line 102, for example, as compared with a configuration in which the cable 104 is cut. The cable 104 can be cut without touching the cutting tool 44 to the inner peripheral wall 102A of the 102.

Further, since the outer peripheral surface 104A of the cable 104 is separated from the inner peripheral wall 102A of the pipeline 102 by inserting the tubular member 22, even if the cable 104 is fixed to the pipeline 102, the cable 104 can be reliably connected from the pipeline 102. It can be peeled off. As a result, the cable 104 cut (divided in the longitudinal direction) by the cutting tool 44 can be easily taken out from the pipeline 102.

Next, the cut cable 104S is taken out from the pipeline 102. Specifically, the cut cable 104S is placed on the inner peripheral surface 22B of the tubular member 22 by its own weight. In this mounted state, the propulsion device 50 is moved and the shaft 52 is pulled back to take out the tubular member 22 from the inside of the pipeline 102. The cable 104 cut at the same time as the removal of the tubular member 22 is also taken out from the pipeline 102.

After the cut cable 104S is taken out from the tubular member 22, the cutting tool 44 is re-accommodated in the groove 23 and the groove 24 of the tubular member 22, and the opening of the groove is closed by the packing member 46. Then, the tip of the tubular member 22 is press-fitted between the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface 104A of the cable 104 using the propulsion device 50, and the cable 104 is cut in the radial direction by the cutting tool 44. Then, the cut cable 104 is taken out from the pipeline 102.
As described above, by alternately repeating the cutting step of cutting the cable 104 in the radial direction with the cutting tool 44 and the taking-out step of taking out the cut cable 104S from the pipeline 102, the cable 104 has a predetermined length in the longitudinal direction. The cable 104 is taken out from the pipeline 102 while being divided into the cables 104, and the cable 104 is removed from the conduit 102.

As shown in FIG. 8, when the length of the shaft 52 becomes insufficient, the shafts 52 are connected to each other by the universal coupling 62. As a result, even if the axes of the shafts 52 are deviated from each other, the rotational force and the propulsive force can be transmitted from the shaft 52 to the shaft 52 with low loss. Further, for the support of the universal coupling 62, as shown in FIG. 8, a pair of support members 64 may be provided in the direction orthogonal to the rotation direction with respect to the universal coupling 62. It is preferable to embed a plurality of balls in the outer peripheral surface 64A of the support member 64. As a result, the frictional resistance when the tubular member 22 is press-fitted into the pipeline 102 can be reduced.

Next, the action and effect of this embodiment will be described.
In the present embodiment, as compared with the method of pulling out one cable 104 from the conduit 102 connecting the manhole 100 and the manhole 100, the cable 104 is divided in the longitudinal direction without applying an excessive pulling force to the cable 104. The cable 104 can be removed from the pipeline 102 by repeating the work of taking out the cable 104 from the pipeline 102.

Further, when the pipeline 102 and the cable 104 are firmly fixed or approach the portion where the cable 104 is firmly fixed, a peeling unit dedicated to peeling is attached to the tip of the shaft 52 of the cable removing device 20. After peeling the cable 104 from the pipeline 102 to a predetermined length, the peeling unit and the cutting unit (a unit including the tubular member 22 and the control unit 38) are replaced, and the cable 104 is divided in the longitudinal direction by the cutting unit and divided. The work of taking out the cable 104S from the pipeline 102 may be repeated.
As the peeling unit, for example, the peeling unit 65 shown in FIGS. 13 and 14 may be used. The peeling unit 65 includes a bottomed cylindrical tubular member 66. The tubular member 66 includes an outer cylinder portion 66A and an inner cylinder portion 66B, and a space 67 is formed between the outer cylinder portion 66A and the inner cylinder portion 66B. Further, a plurality of spacers 69 are provided between the outer cylinder portion 66A and the inner cylinder portion 66B, and the space 67 is held. The outer skin of the cable 104 scraped off by the cutter 68, which will be described later, is accommodated in this space 67. A plurality of openings 66D connected to the space 67 are formed on the inclined tip surface 66C of the tubular member 66 at intervals in the circumferential direction. A cutter 68 is attached in the vicinity of the opening 66D. The cutter 68 bites into the outer skin of the cable 104 by the propulsive force and the rotational force from the propulsion device 50, and peels off the cable 104 from the pipeline 102 while scraping off the outer skin. The outer skin scraped off by the cutter 68 is housed in the space 67 through the opening 66D, and after the peeling unit 65 is removed, it can be discharged from the space 67 through a discharge port (not shown) formed in the bottom 66E of the tubular member 66. .. The discharge port is closed with a lid (not shown) or the like. Further, a bag body for collecting the outer skin may be attached to the discharge port. Further, the outer cylinder portion 66A and the inner cylinder portion 66B of the tubular member 66 are provided with balls 26 and balls 28 in the same manner as the tubular member 22 of the cutting unit. Due to these balls 26 and 28, the frictional resistance between the tubular member 66 and the inner peripheral wall 102A of the pipeline 102 and the outer peripheral surface of the cable 104 when the tubular member 66 is rotationally inserted (friction resistance against rotation and insertion). Friction resistance) is reduced.
The configuration of the peeling unit 65 is not particularly limited as long as the cable 102 fixed to the pipeline 102 can be peeled from the pipeline 102. For example, a transport member (for example, a screw auger) for transporting the outer skin, which has been scraped off, may be provided in the space 67 of the tubular member 66.

(Other embodiments)
In the above-described embodiment, the shaft 52 to which the rotation support portion 60 of the propulsion device 50 is connected is rotated, but the present invention is not limited to this configuration. For example, the propulsion device 50 may be configured not to include the rotation support portion 60. That is, the tubular member 22 may be configured to be non-rotatable via the shaft 52.

Further, in the above-described embodiment, a plurality of balls 26 are embedded in the inner peripheral surface 22B of the tubular member 22 and a plurality of balls 28 are embedded in the outer peripheral surface 22C, but the present invention is not limited to this configuration. The ball may not be embedded in the inner peripheral surface 22B and the outer peripheral surface 22C of the tubular member 22.

In the above-described embodiment, the cable 104 is cut by circulating driving while reducing the diameter of the annular portion 44A of the cutting tool 44, but the present invention is not limited to this configuration. For example, the cutting tool 44 that is circulated and driven like the cable removing device 70 shown in FIG. 15 is moved from one end (upper end in FIG. 15) to the other end (lower end in FIG. 15) of the cable 104 in the radial direction (in the direction of arrow M1). The cable 104 may be moved) to cut the cable 104 in the radial direction. Further, for example, the cable 104 is moved in the radial direction by moving the other portion along the groove portion 23 (arrow M2) with a part of the cutting tool 44 that is circulated and driven as a fulcrum as a fulcrum as in the cable removing device 80 shown in FIG. It may be configured to cut.

Further, in the above-described embodiment, the cable 104 is cut in the radial direction by the cutting tool 44 being circulated and driven with respect to the fixed tubular member 22, but the present invention is not limited to this configuration. For example, as in the cable removing device 90 shown in FIG. 17, the cutting tool 92 which is linear and accommodated in the groove 23 while rotating the tubular member 22 (in the direction of arrow R) by the rotational force of the propulsion device 50. May be configured to pull out from the groove 23 and cut the cable 104 in the radial direction. In the case of this configuration, since the cutting tool 92 is rotated together with the tubular member 22 to cut the cable 104, the cable 104 can be cut in the radial direction with a simple device configuration.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be modified in various ways other than the above within a range not deviating from the gist thereof. Of course.

20 Cable removal device 22 Cylindrical member 22B Inner peripheral surface 22C Outer peripheral surface 23 Groove 26 Ball (inner rotating member)
28 balls (outer rotating member)
32 Attitude control unit (attitude control means)
40 Drive device 44 Cutting tool 44A Circular part 50 Propulsion device 52 Shaft 70 Cable removing device 80 Cable removing device 90 Cable removing device 92 Cutting tool 102 Pipe line 102A Inner peripheral wall 104 Cable 104A Outer surface 104S cable

Claims (4)

It is a cable removal method for removing a cable inserted into a pipeline arranged underground from the pipeline.
A cutting step of inserting a cutting tool between the inner peripheral wall of the pipeline and the outer peripheral surface of the cable to cut the cable in the radial direction.
It has a take-out step of taking out the cut cable from the pipeline.
In the cutting step, a tubular member provided with the cutting tool is inserted between the inner peripheral wall of the pipeline and the outer peripheral surface of the cable to separate the outer peripheral surface of the cable from the inner peripheral wall of the pipeline. In this state, the cable is cut in the radial direction by the cutting tool.
It is a cable removal method in which the cable is taken out from the pipeline while being divided in the longitudinal direction by alternately repeating the cutting step and the taking-out step, and the cable is removed from the pipeline.
The tubular member is inserted into the pipeline by a propulsion device arranged outside the pipeline.
The cutting tool is linear and endless, is housed in an annular groove formed along the circumferential direction on the inner peripheral surface of the tubular member, and is circulated and driven by a drive device.
In the cutting step, a cable removing method in which the cutting tool is circulated and driven to cut the cable in the radial direction while reducing the diameter of the annular portion accommodated in the groove portion of the cutting tool. It is a cable removal method for removing a cable inserted into a pipeline arranged underground from the pipeline.
A cutting step of inserting a cutting tool between the inner peripheral wall of the pipeline and the outer peripheral surface of the cable to cut the cable in the radial direction.
It has a take-out step of taking out the cut cable from the pipeline.
In the cutting step, a tubular member provided with the cutting tool is inserted between the inner peripheral wall of the pipeline and the outer peripheral surface of the cable to separate the outer peripheral surface of the cable from the inner peripheral wall of the pipeline. In this state, the cable is cut in the radial direction by the cutting tool.
It is a cable removal method in which the cable is taken out from the pipeline while being divided in the longitudinal direction by alternately repeating the cutting step and the taking-out step, and the cable is removed from the pipeline.
The tubular member is inserted into the pipeline by a propulsion device arranged outside the pipeline and is made rotatable about an axis.
The cutting tool is linear and is housed in an annular groove formed along the circumferential direction on the inner peripheral surface of the tubular member.
Wherein the cutting step, while rotating the tubular member by the propulsion device and pull the cutting tool from said groove, cut the cable in a radial direction, cables removing method. Propulsive force is transmitted to the cylindrical member from a shaft connected to the propulsion device.
Attitude control capable of controlling the posture of the tubular member in the pipeline by tilting the axial center of the tubular member with respect to the axial center of the shaft between the tubular member and the shaft. The cable removing method according to claim 1 or 2 , wherein the means is provided. A plurality of inner rotating members that rotate in contact with the outer peripheral surface of the cable are provided on the inner peripheral surface of the tubular member.
The outer peripheral surface of the tubular member, the outer rotary member rotating in contact with the inner wall of the conduit is provided with a plurality of cable removal method according to any one of claims 1 to 3 ..

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