Simultaneous removal and installation of underground power cables

Abstract

The present invention relates to a method for simultaneously removing and installing an underground power cable, and more specifically, to a method for simultaneously removing and installing a new underground power cable, including a removal preparation step in which a removal rope is pulled out by a removal winch on which the removal rope is wound, and the removal rope is pulled into a manhole to connect it to the cable to be removed, a connection step in which the tip end of the new cable wound around a rotating drum is connected to the rear end of the cable to be removed laid in the underground pipeline through a pull-in manhole, and a cable replacement step in which the removal cable is inserted into a drive roller section, the drive roller section is driven to remove the cable to be removed, and the new cable is pulled into the underground pipeline.

Description

[Technical Field]

[0001] The present invention relates to a method for simultaneously removing and installing an underground power cable, and more particularly to a method for simultaneously removing and installing an underground power cable, in which the rear end of the cable to be removed and the front end of the cable to be newly installed are connected to each other with a connector, thereby removing the cable to be removed, and at the same time, the new cable is pulled into an underground conduit, thereby shortening the time required compared to conventional processes. [Background technology]

[0002] Generally, the underground line method for power pipeline construction involves burying power pipelines in the ground and then using the buried power pipelines to bury cables in the ground.

[0003] Such underground lines consist of a conduit buried underground, manholes buried on both sides of the conduit, and a new cable installed in the conduit between the manholes, with transformers and switches located at branching points and power supply points. In order to replace such a cable buried in the ground, the buried cable must first be removed.

[0004] In particular, in the conventional cable removal method, one side of a wire is first connected to the end of the cable to be replaced, and the end of the cable and the wire connected to one side are then connected to a crane. The cable is then lifted using the crane and removed from the manhole, and the crane moves along the road to pull out the buried cable. This conventional cable removal method has a problem in that road control work must be carried out for the distance the crane travels.

[0005] That is, when the crane is moving, the guide must perform a guide operation to prevent other vehicles from approaching, which poses a risk to the safety of the guide.

[0006] In addition, workers must use a cutter to cut each cable that is removed from the manhole, then tie it up. Then, they have to use a crane to lift the tied-up cable bundle, load it, and move it, which is an additional step, and it is inconvenient that roads must be blocked off until the work is completed.

[0007] Of course, it is possible to lift the cable by the crane without moving the crane, and then cut the lifted cable and tie down the cut cable for loading.

[0008] In addition, after the cable cutting operation, in order to separate the cut cable from the crane, the wire connected to the cable must be untied from the cable and then tied back to the end of the cable remaining inside the manhole, which must be repeated.

[0009] This not only significantly reduces the efficiency of workers working in the narrow space of a manhole, but also exposes workers to safety accidents in which they may be injured during work.

[0010] A closer look at the cable removal device in Patent Document 1 (Korean Patent Registration No. 10-0851196, registered on August 1, 2008) as prior art reveals that the cable removal device includes a main rotary jig that is connected to a hydraulic motor and can rotate in contact with the cable to remove the cable, and a winch that is connected to the main rotary jig and rotates to pull the removed cable. The cable removal device also includes a sub rotary jig that is installed to be able to move back and forth adjacent to or spaced apart from the main rotary jig and is rotatably installed between the main rotary jig and the main rotary jig so that the cable can be removed, and a bed that is installed horizontally on the ground and on which the main rotary jig, winch, and rotary jig are mounted.

[0011] Although such conventional techniques allow cable removal work to be performed in a fixed state without moving equipment such as a crane, the reality is that they do not solve any problems with cutting and loading the cable after removal, or with separating the conductor and insulator.

[0012] Furthermore, when installing new underground lines, the cable is usually supplied to the site wound up on a drum, and the length of cable installed at one time is approximately 250 to 300 meters. Due to the characteristics of electricity, three cables are placed in one conduit hole, and the three cables form one circuit (for three-phase AC). The cable wound up on the drum is moved inside the underground conduit or above ground, and then the cable is installed while being unwound.

[0013] Considering that the lifespan of installed cables is usually 30 years, they must be replaced with new cables in the future. However, the current general construction methods for new installation and removal have the following problems. First, there is the inefficiency of work involved in the repetitive process of installing one line at a time in the same location where multiple lines are installed. Second: Repeated installation and removal of cable drums is uneconomical. Third: Insufficient information management of installed cables and lack of reliability in installation quality. Fourth: During the removal work, there were problems such as the discontinuity of pulling out the removed cable to the side of the road, cutting it, tying it together, and loading it onto a work vehicle, which reduced work efficiency.

[0014] For example, devices proposed for construction companies to retrieve cables include Patent Document 2: Korean Patent Registration No. 10-0921984 "Winding device for retrieving electric wires," Patent Document 3: Korean Patent Registration No. 10-0978003 "Vehicle-mounted automatic distribution cable pulling device," and Patent Document 4: Korean Patent Registration No. 10-1027732 "Multi-circuit cable pulling device for drum cables," both of which were filed and registered by the present applicant, and Patent Document 5: Korean Patent Registration No. 10-1261458 "Multi-circuit pulling device for underground cables," in which the cables are wound and retrieved by rotating a winding drum using hydraulic pressure supplied from the vehicle on which they are mounted.

[0015] The collected cables wound on the winding drums are usually transported to a materials warehouse and stored for a certain period of time before being sold to a recycling company for reprocessing. After being transported and stored several times, the discarded cables are stripped of their outer sheath (insulation) at the reprocessing company, and only the copper is recycled.

[0016] Currently, the cable removal (recovery) process involves repeatedly pulling out the cable using a cable puller powered by an electric motor. This method involves repeatedly tying and pulling out the cable within the narrow manhole, and once the cable reaches the outside of the manhole, it is cut and removed at a time, about 3 meters at a time. Considering that one manhole span is 250-300 meters, this process is complex and extremely difficult, requiring more than 80-100 times of tying and untying to complete the removal of one section.

[0017] Therefore, although removal work takes more time than installing a new cable, the construction cost is simply calculated at 50% of the cost of installing a new cable, and in actual cases, rather than using a cable puller, heavy equipment such as a crane or backhoe is used to pull the cable to the side of the road and spread it out before removal.

[0018] The removal method of using vehicles or heavy equipment to pull out the cables is effective in shortening the work time, but since the pulling speed is high, it is difficult to control the speed and there is a risk of damaging other live cables inside the manhole.

[0019] In addition, after pulling out approximately 250 to 300 meters of cable to the side of the road, two people work together to cut the removed cable, moving about 2 to 3 meters at a time with a large manual cutter, in order to retrieve the cable that has been removed to the side of the road. The cut cables are then tied together in groups of several dozen for transport back to the vehicle, which is then loaded onto the vehicle using a cargo crane and removed.

[0020] During the cable removal process, the cables are pulled out, cut, tied together, and loaded, causing a continuous disruption to traffic flow by blocking approximately 250 to 300 meters of traffic lane, so the cable removal process needs to be improved. Therefore, there was a need for a new device that could process the cable to be removed immediately on site, without having to go through a series of manual processes as in the past.

[0021] To solve the above problems, Patent Document 6: Korean Patent No. 10-1031795 (registered on April 21, 2011) "Mounted Three-Phase Distribution Cable Automated Removal Device" and Patent Document 7: Korean Patent No. 10-1147597 (registered on May 14, 2012) "Underground Cable Composite Power Pooling Device" were proposed.

[0022] The former removal device uses a winch to pull out the cable from inside the power trench or conduit, and then places the cable between upper and lower rollers and pulls out the cable through pressure and rotation with the help of a hydraulic cylinder.

[0023] The latter pulling device is a device that pulls out a cable using a winch that is rotated by a hydraulic motor, and is equipped with a cable cutter to make it easier to recover old cables. However, since these cable cutters are fixed, they are configured to cut the recovered cable while stopped after pulling out a predetermined length, and therefore cannot continuously pull out and cut the recovered cable at the same time, which causes uneconomical problems such as increased equipment operating time and work time.

[0024] In addition, Patent Document 8, Korean Patent No. 10-1471017, "Cable Multi-Pulling Device," filed and registered by the applicant, is configured to cut the recovery cable with a fixed cutting section at the point of return of a pulling section consisting of a first clamping device and a second clamping device, which pull out the recovery cable in a linear reciprocating motion and temporarily suspend it.

[0025] This is designed to make it easier to cut the recovered cable while pulling it out more stably than the conventional recovery cable winding method, but it has the uneconomical problem of increasing equipment operating time and work time because the recovery cable cannot be continuously pulled out and cut at the same time.

[0026] Furthermore, the conventional devices for removing the recovered cable and installing the new cable are both independently mounted on vehicles so that they can perform their work while moving.

[0027] Therefore, in order to retrieve and install a new cable, two vehicles and two drivers are required to operate them, which requires manpower, and the equipment installed on the two vehicles must be replaced, making the work complicated and uneconomical due to the additional costs. [Prior art documents] [Patent documents]

[0028] [Patent Document 1] Republic of Korea Patent No. 10-0851196 (registered August 1, 2008) [Patent Document 2] Korean Patent No. 10-0921984 "Winding device for recovering electric wires" [Patent Document 3] Korean Patent No. 10-0978003 "On-board automatic distribution cable pooling device" [Patent Document 4] Korean Patent No. 10-1027732 "Multi-circuit cable pulling device for drum cables" [Patent Document 5] Korean Patent No. 10-1261458 "Underground cable multi-line pooling device" [Patent Document 6] Korean Patent No. 10-1031795 (registered on April 21, 2011) "On-board automated three-phase power distribution cable removal device" [Patent Document 7] Korean Patent No. 10-1147597 (registered on May 14, 2012) "Underground cable composite power pooling device" [Patent Document 8] Korean Patent No. 10-1471017 "Cable Multi-Pooling Device" Summary of the Invention [Problem to be solved by the invention]

[0029] In order to solve the above-mentioned problems of the conventional technology, the present invention provides a new method for simultaneously removing and installing underground power cables, which shortens the time compared to the conventional method by connecting the rear end of the cable to be removed and the front end of the cable to be newly installed with a connector, removing the cable to be removed, and pulling the new cable into an underground conduit.

[0030] In addition, a method for simultaneously removing and installing underground power cables is provided, in which a stripping section is disposed on one side of a drive roller section to separate the sheath and copper wire of the cable to be removed, and a cutting section is disposed on one side of the stripping section to cut the cable to a certain length, thereby simultaneously separating and cutting the cable to be removed.

[0031] The present invention also provides a method for simultaneously removing and installing an underground power cable, which further includes a brushing process for connecting a brush to the outer circumferential surface of the connector, and in which the brush removes impurities from the inner surface of the underground conduit when the newly installed cable is moved into the underground conduit, thereby preventing damage to the outer sheath of the newly installed cable.

[0032] In addition, we provide a method for simultaneously removing and installing underground power cables, which prevents the cables from twisting by rotating the connection ports, which connect the rear end of the removed cable and the front end of the new cable, around the longitudinal axis. [Means for solving the problem]

[0033] In order to solve the above-mentioned problems, the present invention a removal preparation step in which the removal rope is pulled out by a removal winch on which the removal rope is wound, and the removal rope is pulled into a manhole and connected to a removal cable; A connecting step of connecting the tip end of the new cable wound on the rotating drum to the rear end of the removed cable laid in the underground conduit through a lead-in manhole; and The cable replacement step includes inserting the cable to be removed into a drive roller section, removing the cable by driving the drive roller section, and pulling the new cable into an underground conduit. To provide a method for simultaneously removing and installing underground power cables.

[0034] In the method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention, the removal preparation process may further include a first preparation process of applying power to the removal winch to drive it and pull out the cable to be removed from the underground pipeline; and a second preparation process of placing the cable to be removed pulled out from the underground pipeline on the drive roller unit.

[0035] In the method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention, the connecting step may further include a first installing step of installing the rotating drum in a lead-in device, and installing a plurality of rotating drums corresponding to the number of twists of at least one circuit of the new cable to be installed; a second installing step of pulling the new cable, which is advanced by the lead-in device, into the underground pipeline through the entrance manhole; a first connecting step of connecting a new installation connector port to the front end of the new installation cable and a removal connector port to the rear end of the cable to be removed; and a second connecting step of connecting the new installation connector port and the removal connector port with a connecting connector port.

[0036] In the method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention, the second connecting step may further include a brushing step of connecting a main pipe, the inner diameter of which corresponds to the outer surface of the splice port, to a brush part consisting of brushes formed on the outer surface of the main pipe, and the brushing step may be characterized in that when the splice port moves into the underground pipe, impurities on the inner surface of the underground pipe are removed to prevent damage to the outer sheath of the newly installed cable.

[0037] In the method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention, the cable replacement process may further include a cutting process of disposing a cutting unit on one side of the driving roller unit and cutting the removed cable, which has been transmitted through the driving roller unit, to a predetermined length through the cutting unit.

[0038] In the method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention, the cutting step may further include a separation section connecting step of connecting the tip of the cable to be removed to a peeling section in order to separate the coating, which is the insulator of the cable, from the copper wire, which is the conductor, before connecting the tip of the cable to the cutting section. [Effects of the Invention]

[0039] The method for simultaneously removing and installing an underground power cable according to the present invention involves connecting the rear end of the cable to be removed and the front end of the cable to be newly installed with a connector, removing the cable to be removed, and then pulling the new cable into an underground conduit and installing it. This has the advantage of reducing the number of work steps compared to a process of installing a new cable after removing an existing cable, allowing for quick installation of the cable and minimizing worker fatigue.

[0040] In addition, by cutting the cable to a certain length while transferring it to the cutting section, the operation of pulling out and cutting the cable to be removed can be carried out simultaneously, minimizing the work time and fatigue of the worker, and preventing safety accidents for the worker.

[0041] In addition, the additional work of recycling removed cables can be eliminated by separating the coating, which is the conductor, from the copper, which is the insulator, of the removed cables.

[0042] In addition, the method further includes a brushing process for attaching a brush part to the outer surface of the connector, and when the new cable is moved into the underground conduit, the brush removes impurities from the inner surface of the underground conduit, preventing damage to the outer sheath of the new cable. This allows the new cable located inside the underground conduit to be used for a long period of time, and has the advantage of improving construction quality.

[0043] In addition, the connectors that connect the rear end of the cable to be removed and the front end of the new cable are designed to rotate around the longitudinal axis, preventing twisting of the cables, which has the advantage of enabling quick cable removal and installation. [Brief explanation of the drawings]

[0044] [Figure 1] 1 is a process diagram showing a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention. [Figure 2] FIG. 2 is a conceptual diagram illustrating the concept of FIG. 1 using an underground power cable replacement device. [Figure 3] 1 is an exemplary diagram showing a drive roller unit of a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention. [Figure 4] 1 is an illustrative diagram showing a stripping section of a simultaneous removal and new installation method for an underground power cable according to an embodiment of the present invention. FIG. [Figure 5] 1 is a process diagram specifically illustrating a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention. [Figure 6] 1 is a conceptual diagram showing the new installation process of the connecting process of the simultaneous removal and new installation method of an underground power cable according to an embodiment of the present invention. FIG. [Figure 7] 1 is an illustrative diagram showing a connecting port and a splicing port for the connecting process of a simultaneous removal and new installation method for an underground power cable according to an embodiment of the present invention. [Figure 8]7 is an exemplary view showing a state in which the brush part is coupled to the connector socket of FIG. 6. FIG. [Figure 9] 1 is a conceptual diagram showing the removal process of a simultaneous removal and new installation method for an underground power cable according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0045] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will enable those skilled in the art to easily carry out the present invention. However, in describing the operation principles of the preferred embodiments of the present invention in detail, detailed descriptions of related well-known functions or configurations will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the gist of the present invention. In addition, the same reference numerals will be used throughout the drawings to refer to parts having similar functions and actions. Furthermore, throughout the specification, when a certain part is referred to as being "connected" to another part, this includes not only direct connection but also indirect connection via an intervening component. Furthermore, unless otherwise specified, "comprising" a certain component does not mean excluding other components, but may further include other components. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for simultaneously removing and installing an underground power cable according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0046] FIG. 1 is a process diagram showing a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention; FIG. 2 is a conceptual diagram showing the concept of FIG. 1 using an underground power cable replacement device; FIG. 3 is an illustrative diagram showing a drive roller section of a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention; FIG. 4 is an illustrative diagram showing a stripping section of a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention; FIG. 5 is a process diagram specifically showing a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention; FIG. 6 is a conceptual diagram showing the installation process of the connection process of a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention; FIG. 7 is an illustrative diagram showing a connecting connector and a splicing connector for the connection process of a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention; FIG. 8 is an illustrative diagram showing a state in which a brush section is connected to the splicing connector of FIG. 6; and FIG. 9 is a conceptual diagram showing the removal process of a method for simultaneously removing and installing an underground power cable according to an embodiment of the present invention.

[0047] As shown in FIG. 1, the method for simultaneously removing and installing an underground power cable (S10) according to an embodiment of the present invention includes a removal preparation step (S100), a connection step (S200), and a cable replacement step (S300).

[0048] More specifically, as shown in Figures 1 and 2, the method (S10) for simultaneously removing and installing an underground power cable according to an embodiment of the present invention includes a removal preparation process (S100) in which a removal rope 110 is pulled out using a removal winch 100 on which the removal rope is wound, and the rope is pulled into a manhole 11 to connect to the cable DC to be removed; a connection process (S200) in which the front end of a new cable NC wound around a rotating drum RD is connected to the rear end of the cable to be removed laid in the underground pipeline through an inlet manhole 12; and a cable replacement process (S300) in which the cable to be removed is inserted into a drive roller unit 200, and the drive roller unit is driven to remove the cable to be removed and pull the new cable into the underground pipeline.

[0049] Here, as shown in FIG. 2, the method for simultaneously removing and installing an underground power cable (S10) according to an embodiment of the present invention includes an underground power cable replacement device 10, which is positioned on one side of an exit manhole 11 and one side of an entrance manhole 12. Such an underground power cable replacement device 10 includes a removal winch 100, a drive roller unit 200, a stripping unit 300, a cutting unit 400, and a leading device 500.

[0050] The removal winch 100 is mounted on a loading box of a moving means such as a vehicle and is driven by an applied power source to wind and unwind the removal rope 110. The removal rope 110 is preferably fixed to one side or end of the removal cable DC through a wire or band.

[0051] Referring to FIG. 3, the driving roller unit 200 is provided on a vehicle to which the removal winch 100 is attached, and serves to wind and unwind the removal rope 110.

[0052] The driving roller unit 200 includes a plurality of support walls 210, at least one upper roller 220 rotatably mounted on the support walls 210, a lower roller 230 spaced a predetermined distance from the upper roller 220, a cylinder 240 for applying pressure to the upper roller 220 while raising and lowering it, and a motor 250 for transmitting power to the lower roller 230. The drive roller unit 200 further includes a gear 260 .

[0053] The gear 260 is disposed between the plurality of lower rollers 230 and is rotatably mounted on the support wall 210 to receive the driving force from the lower rollers 230 driven by the motor 250 .

[0054] Referring to FIG. 3, the stripping unit 300 is disposed on one side of the driving roller unit 200 and separates the sheath and copper wire of the cable DC that has passed through the driving roller unit 200.

[0055] To this end, the peeling unit 300 includes a plurality of lower blades 310, an upper blade 320 spaced a predetermined distance from the lower blades 310, a plurality of transfer tubes 330 that guide the cable DC to be removed so that the lower blades 310 and the upper blades 320 can come into contact with the outer sheath of the cable DC, and openings 340 through which the outer periphery of the transfer tube 330 where the lower blades 310 and the upper blades 320 are located is opened and the removed cable DC is exposed to the upper and lower parts of the transfer tube 330.

[0056] Referring to FIG. 2, the cutting unit 400 is disposed on one side of the driving roller unit 200 and serves to cut the cable DC that has passed through the stripping unit 300 .

[0057] For example, if the cable to be removed is pulled out from the manhole and then pulled out to the side of the road above ground, approximately 250 to 300 meters of cable, the traffic control section will be long, which will pose a safety issue for passing vehicles and workers. To remedy this, it is preferable to disconnect the withdrawal cable DC.

[0058] 2 and 6, the advance device 500 is mounted on the loading box of a vehicle or other moving means and is disposed on one side of the pull-out manhole 12, and serves to lay the new cable NC in the underground pipeline.

[0059] The first-off device 500 has a partitioned frame that can accommodate a plurality of rotating drums RD. The forwarding device 500 further includes a pull-in roller 510 and a tension roller 520 . At least one pull-in roller 510 is provided on one side of the frame to improve the discharge speed of the new cable NC being unwound from the rotary drum RD.

[0060] The tension roller 520 is disposed in the underground conduit where the pull-out manhole 11 is located, and serves to maintain tension on the removal cable DC pulled by the driving of the driving roller unit 200 .

[0061] In this way, the underground power cable replacement device 10 is equipped to pull out the removed cable DC and to pull the new cable NC into the underground conduit, so the removal preparation process (S100) is carried out first, as shown in Figures 2 and 5. For this purpose, the removal preparation step (S100) further includes a first preparation step (S110) and a second preparation step (S120). The first preparation step (S110) is a step of applying power to the removal winch 100 to drive it and pull out the removal cable DC from the underground conduit.

[0062] That is, a vehicle equipped with a removal winch 100 is positioned on one side of the draw-out manhole 11, and the removal rope 110 wound on the removal winch 100 is pulled into the draw-out manhole 11, connecting the removal cable DC laid up to the draw-out manhole 11. Then, the removal winch 100 is driven to pull the removal rope 110, thereby pulling out the removal cable DC from the underground conduit.

[0063] The second preparation step (S120) is a step of placing the removal cable DC drawn out from the underground conduit on the drive roller unit 200.

[0064] For this purpose, the removal rope 110 connected to the tip of the removal cable DC is removed, and the tip of the removal cable DC is inserted into the driving roller unit 200 as in the cable replacement step (S300) described below.

[0065] Referring to Figures 2 and 5, the connecting process (S200) is a process of connecting the front end of the new cable NC wound around the rotating drum RD to the rear end of the cable to be removed DC laid in the underground pipeline through the entrance manhole 12. For this purpose, the method further includes a first installing step (S210), a second installing step (S220), a first joining step (S230), and a second joining step (S240).

[0066] The first new installation process S210 is a process of installing a rotating drum RD in the advance device 500, and installing a plurality of rotating drums RD corresponding to the number of twists of at least one line of the new cable NC. Here, the rotary drum RD is installed for two lines, and since one line consists of three cables, a total of six rotary drums are installed in this embodiment of the present invention. Furthermore, the embodiment of the present invention can also lay only one line instead of two lines.

[0067] Referring to FIG. 6, the second new installation step (S220) is a step of leading the new cable NC, which is first introduced by the advance device 500, into the underground conduit through the lead-in manhole 12.

[0068] That is, in the second new installation step (S220), the new cable NC wound around the rotary drum RD is connected to the pull-in roller 510 to prevent the new cable NC from bending when being pulled into the underground conduit.

[0069] At this time, when the new cable NC is pulled into the inlet manhole 12 from the direction in which it is wound around the rotating drum RD, it forms a "C" shape, which suppresses the occurrence of artificial bending, thereby preventing the neutral wire from bending.

[0070] For example, in the conventional cable pulling method shown in Figure 6(a), the rotating drum is positioned in a straight line with the direction of the cable being laid when pulling in the cable, minimizing the pulling tension generated during pulling, but there is a problem that the cable may be partially bent due to the difference in height from the rotating drum to the underground conduit, which may cause damage to the neutral wire inside the cable.

[0071] In contrast, in the present invention shown in Figure 6(b), when the cable is pulled in, the rotating drum is positioned in the same direction as the cable being laid, so the cable is pulled into the underground conduit in a "C" shape. This results in a higher pulling tension than the conventional method, but has the advantage of preventing damage to the neutral wire. At this time, the problem of high pull-in tension can be solved by using the pull-in roller 510 described above.

[0072] 5 and 7, the first coupling step (S230) is a step of connecting the new installation connector 600 to the leading end of the new cable NC and connecting the removal connector 600 to the trailing end of the removal cable DC.

[0073] Here, the connector 600 has connecting wires connected to one end of the pulling eyes respectively connected to the three power cables, and one end of the connecting wires is formed into a loop.

[0074] Therefore, in the first connecting process (S230), the removal connector 600 is first connected to the rear end of the three cables DC to be removed, and then the new installation connector 600 is connected to the front end of the new installation cable NC that has been pulled into the entrance manhole 12, and the loops are arranged so that they face each other. The second connecting step (S240) is a step of connecting the new connection connector 600 and the removal connection connector 600 with the connecting connector 700.

[0075] Here, the connection port 700 has a shaft portion extending in the length direction, and fastening rings are formed on both sides of the shaft portion to fasten the rings of the connection port 600, thereby connecting the rear end of the removed cable DC and the front end of the new cable NC to each other.

[0076] In particular, the connector 700 is manufactured to fit the length of the continuity test rod, so that the continuity test of the conduit can be performed simultaneously when replacing the cable, thereby preventing problems that may occur due to the lack of continuity of the conduit.

[0077] In this way, the second connection process (S240) uses the connection socket 700 to connect the rear end of the cable DC to the front end of the cable NC to shorten the process of removing the previous cable to be removed and then installing the new cable, thereby reducing work time and manpower costs.

[0078] Meanwhile, as shown in FIG. 8, the second connecting step (S240) of the simultaneous removal and installation method (S10) of an underground power cable according to an embodiment of the present invention further includes a brushing step (S241).

[0079] The brush step (S241) is a step of combining a main pipe whose inner diameter corresponds to the outer surface of the connector port 700 with a brush part 800 formed on the outer circumferential surface of the main pipe.

[0080] In particular, the brushing process (S241) is a process for removing impurities from the inner surface of the underground conduit when the connector 700 moves into the underground conduit, thereby preventing damage to the outer sheath of the new cable NC.

[0081] In other words, the brushing process (S241) involves pulling the removed cable DC in the cable replacement process (S300), causing the new cable NC to move into the underground pipeline, and the connector 700 then comes into contact with the inner surface of the underground pipeline to remove impurities as it enters the underground pipeline.

[0082] This allows the new cable NC to be laid in the underground conduit while cleaning the inner surface of the underground conduit, and prevents damage to the outer sheath of the new cable NC that comes into contact with the inner surface of the cleaned underground conduit, allowing it to be used for a long period of time without replacement.

[0083] Referring to Figures 5 and 9, the cable replacement process (S300) is a process in which the removed cable DC is inserted into the drive roller unit 200, and the removed cable DC is removed by driving the drive roller unit 200, and a new cable NC is pulled into the underground pipeline.

[0084] In this cable replacement process (S300), before removing the cable DC to be removed, the removal preparation process (S100) is performed to place the cable DC on the driving roller unit 200. Then, the second new installation process (S220) is performed to introduce the new cable NC into the inlet manhole 12.

[0085] Thereafter, the leading end of the new cable NC is connected to the trailing end of the removed cable DC using the connecting port 600 and the connecting port 700 in the connecting step (S200).

[0086] Next, the tip of the removal cable DC is inserted into the drive roller unit 200, and the drive roller unit 200 is driven.

[0087] At this time, while the removed cable DC is being pulled, the new cable NC moves in the direction in which the removed cable DC is being pulled and is pulled into the underground conduit, making it possible to lay the cable at the same time as removing it.

[0088] Referring to FIGS. 5 and 9, the cable replacement step (S300) further includes a cutting step (S310).

[0089] The cutting step (S310) is a step of disposing a cutting unit 400 on one side of the driving roller unit 200 and cutting the removal cable DC transmitted through the driving roller unit 200 to a predetermined length through the cutting unit 400.

[0090] This solves the conventional problem of workers having to completely pull out the long cable DC from the manhole, place it on the road, and then cut it off with a cutter. In particular, it is preferable that the cable DC to be removed can be pulled out from the manhole and cut to a certain length at the same time as it is transported, and the cut cable can be loaded onto another means of transportation.

[0091] For example, the cut length of the cable to be removed is preferably 2 to 3 meters. If the cut length is less than 2 meters, the time required for pulling out and cutting the long cable to be removed will be delayed. If the cut length is more than 3 meters, it will be difficult to tie up the cut cable, and it will be difficult to transport the tied up cable when loading it.

[0092] Meanwhile, as shown in Figures 2 and 4, the cutting step (S310) of the simultaneous removal and installation method (S10) of an underground power cable according to an embodiment of the present invention further includes a separation part connecting step (S311).

[0093] The separation section connection process (S311) is a process of connecting the tip of the cable DC to the peeling section 300 to separate the coating, which is the insulator of the cable to be removed, from the copper wire, which is the conductor, before connecting the tip of the cable DC to the cutting section 400.

[0094] More specifically, in the separation unit connection process (S311), the removal cable DC that has passed through the driving roller unit 200 is inserted into the transfer tube 330, and the outer sheath of the removal cable DC is exposed through an opening 340 cut on one side of the transfer tube 330.

[0095] At this time, the lower blade 310 and the upper blade 320 arranged in the opening 340 cut the outer sheath of the cable DC to be removed in the lengthwise direction of the upper and lower sides. Then, the cable DC to be removed whose upper and lower parts have been cut is transferred to the cutting unit 400 and cut to a predetermined length, and then delivered to a transport vehicle.

[0096] As described above, the detailed description of the present invention has been given with respect to the preferred embodiment of the present invention, but this is merely an illustrative description of the best embodiment of the present invention and is not intended to limit the present invention. Furthermore, it goes without saying that anyone with ordinary skill in the art to which the present invention pertains can make various modifications and imitation of the present invention within the scope of the technical concept of the present invention. Therefore, the scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms within the scope of the appended claims. Furthermore, the scope of the present invention includes various modifications that can be made by anyone skilled in the art without departing from the gist of the present invention as claimed in the claims.

Claims

1. a removal preparation step in which the removal rope is pulled out by a removal winch on which the removal rope is wound, and the removal rope is pulled into a manhole and connected to a removal cable; a connecting step of connecting the leading end of the new cable wound around the rotary drum to the trailing end of the removed cable laid in the underground conduit through a lead-in manhole; and a cable replacement step of inserting the removed cable into a drive roller unit, removing the removed cable by driving the drive roller unit, and pulling the new cable into an underground conduit; The linking step comprises: a first installation step of installing the rotating drums in the advance device, the first installation step being to install a plurality of rotating drums corresponding to the number of twists of at least one new cable line; a second new installation step of introducing the new cable, which is advanced by the advance device, into the underground conduit through the entrance manhole; a first connecting step of connecting a new cable connector to the front end of the new cable and connecting a removal cable connector to the rear end of the removal cable; and The method further includes a second connecting step, which includes a brush step of connecting the new installation connector and the removal connector by connecting a main pipe having an inner diameter corresponding to the outer surface of the connector with a brush part formed on the outer circumferential surface of the main pipe, to remove impurities from the inner surface of the underground conduit when the connector moves into the underground conduit, thereby preventing damage to the outer sheath of the new installation cable, The new installation connector and the removal connector each include a rod-shaped pulling eye and a ring formed on one side of the pulling eye, The connector has a shaft portion extending in the length direction, and fastening rings are formed on both sides of the shaft portion to fasten the rings of the new connector and the removal connector, thereby connecting the rear end of the removed cable and the front end of the new cable to each other and enabling the cable replacement process to be performed. A method for simultaneously removing and installing an underground power cable, characterized by:

2. The removal preparation step includes: a first preparation step of applying power to the removal winch to drive it and pull out the removal cable from the underground conduit; and The method further includes a second preparation step of placing the removal cable pulled out from the underground conduit on the drive roller unit. The method for simultaneously removing and installing an underground power cable according to claim 1.

3. The cable replacement step includes: The method further includes a cutting step of disposing a cutting unit on one side of the driving roller unit and cutting the removal cable transmitted through the driving roller unit to a predetermined length through the cutting unit. The method for simultaneously removing and installing an underground power cable according to claim 1.

4. The cutting step includes: The method further includes a separation part connecting step of connecting the tip of the cable to a peeling part to separate the coating, which is an insulator of the cable, from the copper wire, which is a conductor, before connecting the tip of the cable to the cutting part. The method for simultaneously removing and installing an underground power cable according to claim 3.

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