In-conduit cable peeling tool

Abstract

To provide an auxiliary tool capable of surely and smoothly removing a cable fastened to an inner wall of a duct line, and preventing a cable front surface from being damaged.SOLUTION: An in-conduit cable peeling tool main body 1 is formed by: a first wire rope 2 having a tip end ring part 3, a base end ring part 4, a first wire part 5 coupling the tip end ring part 3 and the base end ring part 4, and a center ring part 6 provided to the first wire part 5; a second wire rope 7 having a holding ring part 8, a fixing ring part 9, a second wire part 10 coupling the holding ring part 8 and the fixing ring part 9, and a coating part 11 of the second wire part 10; and a connection tool 12 connected to the center ring part 6. The holding ring part 8 is connected to the center ring part 6, and the fixing ring part 9 is connected to the connection tool 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cable stripping tool that enables removal of a cable that is stuck to the inner wall of a pipeline and cannot be pulled out. [Background technology]

[0002] When removing a cable from a conduit, there are cases where the cable sheath deteriorates over time and adheres and hardens to the inner wall of the conduit, causing the cable to become stuck inside the conduit and making it impossible to simply pull it out. In such cases, if the cables are left in the conduit rather than being removed, the pipe cannot be reused and a new pipe must be laid, resulting in huge costs. Furthermore, if the cable is forcibly pulled out, the cable sheath and other parts of the cable may come off from the attached portion and remain inside the conduit, which may cause abnormalities in the conduit.

[0003] The following Patent Document 1 shows a method and device for pulling a cable out of a pipeline by pulling a cable chuck set on the end of the cable to be removed in the axial direction of the cable with a pair of jack devices supported on a stand that abuts against a wall surface. However, using such a large-scale device is undesirable not only in terms of time and labor, but also in terms of cost. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-336831 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide an auxiliary tool that is used to peel off and remove a cable fixed to the inner wall of a conduit, which has a simple structure, is highly productive, and can be manufactured inexpensively. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the invention described in claim 1 is an in-pipe cable stripping tool comprising a first wire rope having a tip ring portion at its tip, a base ring portion at its base end, a first wire portion connecting the tip ring portion and the base ring portion, and a central ring portion provided on the first wire portion, a second wire rope having a retaining ring portion at one end, a fixed ring portion at the other end, and a second wire portion connecting the retaining ring portion and the fixed ring portion, and a connector connected to the central ring portion, wherein the retaining ring portion is connected to the central ring portion, and the connector is freely connectable to the fixed ring portion.

[0007] The invention described in claim 2 is the in-pipe cable stripping tool described in claim 1, characterized in that the second wire rope has a surface coated with synthetic resin. Effect of the Invention

[0008] According to the invention as defined in claim 1, the cable fixed to the inner wall of a conduit can be removed reliably and smoothly. According to the invention as defined in claim 2, the cable can be removed from within the conduit without damaging the surface of the cable. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is an explanatory diagram of an in-pipe cable peeling tool. [Diagram 2] FIG. 10 is an explanatory diagram showing a state in which the in-pipe cable peeling tool is being used. [Diagram 3] 1A is an explanatory diagram showing a state in which the in-duct cable peeling tool is set, FIG. 1B is an explanatory diagram showing a state in which the in-duct cable peeling tool is being pulled, and FIG. 1C is an explanatory diagram showing a state in which the cable has been peeled off from the fixed portion in the duct. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLES

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

[0011] FIG. 1 is an explanatory diagram of an in-pipe cable stripping tool, in which the reference numeral 1 denotes the in-pipe cable stripping tool main body, 2 denotes a first wire rope, 3 denotes a tip ring portion provided at the tip of the first wire rope 2, 4 denotes a base ring portion provided at the base end of the first wire rope 2, 5 denotes a first wire portion connecting the tip ring portion 3 and the base ring portion 4, and 6 denotes a central ring portion provided approximately in the center of the first wire portion 5 between the tip ring portion 3 and the base ring portion 4. Reference numeral 7 denotes a second wire rope, 8 denotes a retaining ring portion provided at one end of the second wire rope 7 and connected to the central ring portion 6, 9 denotes a fixed ring portion provided at the other end of the second wire rope 7, 10 denotes a second wire portion connecting the retaining ring portion 8 and the fixed ring portion 9, 11 denotes a synthetic resin coating portion which covers the surface of the second wire rope 6, and 12 denotes a connector which is connected to the central ring portion 6 and can be freely connected to the fixed ring portion 9.

[0012] In this embodiment, the first wire portion 5 and the second wire portion 10 are made of stainless steel, but this is just one example, and they may also be made of steel, copper, or the like. In addition, a snap-on swivel that can be opened and closed with one touch is used as the connector 12, but the type and shape of the connector are not important as long as it is firmly connected to the central ring portion 6 and has a configuration that allows it to be freely connected to the fixed ring portion 9.

[0013] Figure 2 is an explanatory diagram showing the state in which the in-pipe cable stripping tool 1 is being used, and Figure 3 is an explanatory diagram showing the state in which the cable is stripped from its fixed portion inside the pipe, in which the symbol 13 is a pipe-passing side wire string that passes inside the pipe 16, 13a is a pipe-passing side wire string ring portion that is provided at the tip of the pipe-passing side wire string 13 and can be freely connected to the tip ring portion 3, 14 is a pull-back side wire string, 14a is a pull-back side wire string ring portion that is provided at the tip of the pull-back side wire string 14 and can be freely connected to the base ring portion 4, 15 is a cable with a portion of it fixed to the inner wall 16a of the pipe 16, and S is the fixed portion of the cable 15 and the inner wall 16a of the pipe.

[0014] The operation of removing the cable 15 using the in-duct cable stripping tool body 1 will be described with reference to Figs. First, at the position where the cable 15 is exposed from the pipe 16, the pipe-passing side wire-string ring portion 13a is connected to the tip ring portion 3, and the pull-back side wire-string ring portion 14a is connected to the base end ring portion 4. Next, the second wire rope 6, in which the retaining ring portion 8 is connected to the central ring portion 6, is wound around the cable 15 from the fixing ring portion 9 side, and then the fixing ring portion 9 and the connector 12 are connected. Next, with the covering portion 11 covering the surface of the second wire portion 10 in contact with the surface of the cable 15, the pullback side wire string 14, the first wire rope 2, and the pipe side wire string 13, which are connected together, are set directly above the cable 15 (Figures 2 and 3(a)).

[0015] Next, when the pipe-passing side wire cord 13 is pulled in the direction of the arrow in Figure 3 (towards the pipe passing side), the cable 15 is peeled off from the fixed portion S of the inner wall 16a of the pipe, and the cable 15 can be easily pulled out of the pipe 16 (Figures 3(b) and 3(c)). Here, the pulling speed of the pipe-passing side wire string 13 is preferably about 20 meters / minute, and if excessive tension occurs during the pulling operation, it is preferable to retract the pipe-passing side wire string 13 about 50 centimeters in the opposite direction of the arrow (the retraction side) and then resume the operation. In addition, if excessive load causes the connector 12 to deform or become disconnected from the fixed ring portion 9 during towing operation, the connector 12 is replaced and reconnected to the fixed ring portion 9, and then the operation is resumed.

[0016] If the second wire portion 10 were not provided with a covering portion 11, the stainless steel second wire portion 10 and the cable 15 would be in direct contact with each other, and there would be a risk that the cable 15 would be damaged by friction between the second wire portion 10 and the cable 15 during towing operations. Therefore, the synthetic resin covering portion 11 has the effect of protecting the cable 15 and enabling it to be reused. Even if a coating portion 11 is provided, friction with the cable 15 may cause the coating portion 11 to peel off, exposing the second wire portion 10. In such a case, the work is resumed after replacing it with a second wire rope 6 having an unworn coating portion 11.

[0017] After the cable 15 has been pulled out from the pipe 16, the connection between the connector 12 and the fixing ring portion 9 is released on the pipe side, the second wire rope 7 is removed from the cable 15, and the cable 15 is released from the in-pipe cable stripping tool 1.

[0018] If there are multiple stuck cables, after removing the first cable, the retraction side wire pulling string 14 is pulled in the retraction side to return the in-pipe cable stripping tool 1 to its original position, and then the second and subsequent cables are removed using the procedure described above.

[0019] The positions, numbers, materials, and sizes of the components of the present invention are not limited to those in the above embodiment. For example, the position of the central ring portion 6, the material and number of the covering portion 11, the length of the first wire rope 2 and the second wire rope 7, the thickness of the second wire portion 10, etc. can be appropriately changed in design. [Explanation of symbols]

[0020] 1. In-pipe cable stripping tool body 2. First Wire Rope 3 Tip ring 4 Base end ring part 5 First Wire Section 6 Central ring section 7 Second Wire Rope 8 Retaining ring part 9 Fixing ring part 10 Second Wire Section 11 Covering part 12 Connectors 13 Pipe-passing side wire string 13a Pipe side wiring string ring part 14 Pull-back side wire string 14a Pull-back side wire string ring part 15 Cable 16 tubes 16a Pipe inner wall S Fixation part

Claims

1. a first wire rope having a tip ring portion at a tip end, a base ring portion at a base end, a first wire portion connecting the tip ring portion and the base ring portion, and a central ring portion provided on the first wire portion; a second wire rope having a retaining ring portion at one end, a fixing ring portion at the other end, and a second wire portion connecting the retaining ring portion and the fixing ring portion; and a connector connected to the central ring portion; the retaining ring portion is connected to the central ring portion; The connector is freely connectable to the fixing ring portion; An in-pipe cable stripping tool characterized by the above.

2. 2. The in-pipe cable peeling tool according to claim 1, wherein the second wire rope has a surface coated with a synthetic resin.

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