WO2023059004A1 - Construction method for simultaneously removing and installing underground power cables - Google Patents

Abstract

The present invention relates to a construction method for simultaneously removing and installing underground power cables. More specifically, the method comprises: a removal preparation step in which a removal rope is lead into an output manhole from a removal winch, on which the removal rope is wound, and connected to a removal cable; a connection step in which the front end of a new cable wound on a rotation drum is connected, via an inlet manhole, to the rear end of the removal cable laid in an underground duct; and a cable replacement step in which the removal cable is inserted into a driving roller unit, and the driving roller unit is driven to simultaneously remove the removal cable and lead the new cable into the underground duct.

Description

Simultaneous construction method of demolition and new installation of underground power cable

The present invention relates to a simultaneous construction method for the removal and installation of an underground power cable, and more particularly, by mutually connecting the rear end of a demolition cable and the front end of a new cable with a connection bracket to remove the demolition cable and simultaneously install the new cable underground. It relates to a simultaneous construction method of demolition and new installation of an underground power cable that is shorter than the existing process by being introduced into the pipeline.

In general, the underground line method in power pipeline construction is to bury a power pipeline in the ground and bury cables in the ground using the buried power pipeline.

This underground line consists of a pipeline buried in the ground, a manhole buried on both sides of the pipeline, and a cable newly installed in the pipeline between the manhole and the manhole, and a transformer or switchgear is located at the branch or power supply point.

In order to replace the cable buried in the ground, the buried cable must first be removed.

In particular, the conventional cable removal method first connects one side of the wire to the end of the cable to be replaced, connects the wire with the end and one side of the cable connected to a crane, and then lifts the cable using a crane and pulls it out from the manhole. It moves along the road and pulls out the buried cable.

Such a conventional cable removal method has a problem in that the road control work must be performed as much as the moving distance of the crane.

That is, there is a problem in that the risk of safety accidents of the guide is exposed because the guide proceeds with a guide work to prohibit the access of other vehicles when the crane is moving.

In addition, the cable pulled out from the manhole by moving the crane is cut by the operator with a cutter and then tied to the cut cable. In addition, since the tied cable bundle must be lifted using a crane and moved after unloading, it is inconvenient to control the road until the work is completed.

Of course, the cable may be lifted by the crane without moving the crane, and then the lifted cable may be cut, and the cut cable may be bundled for loading.

In addition, in order to separate the cut cable from the crane after the cable cutting operation, the wire connected to the cable must be released from the cable, and then the operation of tying it to the end of the cable remaining inside the manhole must be repeated.

As a result, there is a problem that the work efficiency of the worker in the narrow space of the manhole is significantly lowered, as well as a problem that the worker is exposed to a safety accident in which the worker is injured during work.

As a prior art, looking at the cable removal device of Korean Registered Patent No. 10-0851196 (registered on August 1, 2008), a main rotary jig that is connected to a hydraulic motor and can draw the cable by rotating in contact with the cable; A cable removal device including a winch for tensioning the drawn cable while rotating in communication with the main rotational jig, installed to be reciprocally movable adjacent to or separated from the main rotational jig, and between the main rotational jig and the main rotational jig. It is provided with a sub-rotational jig rotatably provided to draw the cable, and a bed to which the main rotational jig, winch, and rotational jig are mounted and installed horizontally on the ground.

Although this prior art allows the cable removal work to be performed in a fixed state without moving equipment such as a crane, the problems of cutting work, loading work, and separation of conductors and insulators after removing the cable are completely solved. It is currently unable to do so.

In addition, when a new underground line is installed, the cable is usually supplied to the site in a state wound on a drum, and the length of the cable installed at one time is approximately 250 to 300M. It is composed of 1 line (for 3-phase alternating current), and the cable wound on the drum is moved to the inside of the underground pipe or on the ground and then installed while unwinding the cable.

Considering that the lifespan of a normally installed cable is 30 years, it should be replaced with a new cable in the future. However, the current general construction and demolition construction method has the following problems.

First: Inefficiency of work due to repetitive process of installing one line at a time in the same place where several lines are installed.

Second: Uneconomical due to repeated installation and removal of cable drums.

Third: Lack of information management of construction cables and lack of reliability in construction quality.

Fourth: During the demolition work, there were problems such as deterioration in work efficiency due to discontinuity such as pulling out a long cable on the roadside, cutting it, tying it briefly, and loading it onto a work truck.

For example, a device for a constructor to recover cables is a Korean Patent Registration No. 10-0921984 "Rewinding Device for Wire Recovery" and a Registration Patent No. 10-0978003 "Vehicle-mounted Power Distribution Cable Automatic Pulling Device" and the present applicant applied for Registered Patent No. 10-1027732 “Drum cable multi-line cable pulling device” and Registered Patent No. 10-1261458 “Underground cable multi-line pulling device” have been proposed, and these devices are wound by hydraulic pressure supplied from the vehicle. The drum was rotated to wind and recover the cable.

The recovered cable by winding it on the winding drum is usually moved to a material warehouse, stored for a certain period of time, and then sold to a recycling company for reprocessing. At this time, the cable to be discarded after several times of transportation and stacking is stripped of the outer sheath (insulator) at a reprocessing company and only copper is recycled.

Currently, the cable removal (recovery) process is to be pulled out and removed with a cable puller using an electric motor. In this method, bundling and pulling are repeatedly performed in a narrow manhole, and when about 3M of cable comes out of the manhole at a time, it is cut and removed. Considering that one manhole span is 250 to 300M, the above process was a complex and very difficult task in which one section had to be repeated about 80 to 100 times to complete the work of tying and untying for demolition of one section.

Accordingly, while the demolition work requires more work time than the cable installation work, the construction cost is reflected by simply setting 50% of the new construction cost. It is used to pull it out on the side of the road and spread it out for a long time and demolish it.

The method of pulling out using the vehicle or heavy equipment is effective in reducing working time, but since it is pulled out at a high speed, it is difficult to control the speed and there is a risk of damaging other live cables in the manhole.

In addition, after pulling about 250~300m of cable to the roadside, two people work together to cut the removed cable while moving about 2~3m at a time with a large manual cutter to recover the cable that was removed from the roadside.

In addition, the cut cables are bundled together dozens of times in order to be transported to the vehicle again, and are withdrawn after loading using a cargo crane.

In the cable removal process, about 250 to 300M lanes are continuously controlled during the cable pulling out, cutting, tying, and loading work, which hinders traffic flow, so improvement of the cable removal process is required. .

Therefore, there is a need for a new device capable of immediately processing the cable to be removed in the field without going through a series of manual processes as in the prior art.

In order to solve the above problems, Korean Patent No. 10-1031795 (registered on April 21, 2011) "Vehicle-mounted three-phase distribution cable automatic removal device" and Korean Patent No. 10-1147597 (registered on May 14, 2012) An "underground cable complex power source pulling device" has been proposed.

The former withdrawal device is a method of drawing out a cable inside a power conduit or a conduit with a winch, disposing the cable between an upper roller and a lower roller, and pulling the cable out through compression and rotational motion with the help of a hydraulic cylinder.

The latter pulling device is a decoration that pulls the cable using a winch rotated by a hydraulic motor, and they are equipped with cable cutters for the convenience of recovering old cables. Since the recovery cable is cut in a stopped state after being pulled out, the recovery cable cannot be continuously pulled out and cut at the same time, so there is an uneconomical problem in that facility operation time and working time increase.

In addition, Registered Patent No. 10-1471017 "Cable multi-pulling device" filed and registered by the present applicant is a return point of the traction unit composed of a first clamping device and a second clamping device that pulls the recovered cable in a straight reciprocating motion and temporarily stops it. It is a configuration in which the recovery cable is cut with the cutting part for fixing to

This is a more stable and convenient way to cut the recovered cable than the conventional winding method. there was.

In addition, all of the devices for removing the conventional recovery cable and installing a new cable are independently mounted on a vehicle and work while moving.

As a result, manpower is wasted because two vehicles and two drivers are required to recover and install cables, and the work is cumbersome and costly because equipment mounted on two vehicles must be used while replacing them. there was a nasty problem.

In order to solve the above problems of the prior art, the present invention mutually connects the rear end of the removed cable and the front end of the new cable with a connection bracket to remove the removed cable and at the same time introduce the new cable into the underground conduit, shortening the process compared to the existing process. It is to provide a simultaneous construction method of demolition and new installation of underground power cables of a new structure.

In addition, by arranging a stripping skin on one side of the driving roller part to separate the sheath of the stripping cable and the copper wire, and by placing a cutting part on one side of the stripping skin to cut the stripping cable to a certain length, the underground power that can separate and cut the stripped cable at the same time It is to provide a simultaneous construction method of cable removal and new installation.

In addition, a brush process of coupling the brush to the outer circumferential surface of the connection bracket is further included, so that when the new cable is moved to the inside of the underground pipe, the brush removes impurities from the inner surface of the underground pipe to prevent damage to the outer skin of the new cable. It is to provide a simultaneous construction method of cable removal and new installation.

In addition, it is to provide a simultaneous construction method for removing and installing a new underground power cable that prevents twisting of the cable by rotating a connecting bracket connected to the rear end of the removed cable and the front end of the new cable in an axis in the longitudinal direction.

The present invention to solve the above problems

A demolition preparation step of drawing the demolition rope from the demolition winch in which the demolition rope is wound into the withdrawal manhole and connecting it to the demolition cable;

A connection step of connecting the front end of the new cable wound around the rotating drum to the rear end of the demolition cable installed in the underground pipeline through the inlet manhole; and

A cable replacement step of inserting the demolition cable into the driving roller unit and pulling the new cable into the underground conduit while the demolition cable is removed by driving the driving roller unit

Provides a simultaneous construction method for demolition and new installation of underground power cables.

In the simultaneous construction method of removing and installing underground power cables according to an embodiment of the present invention, the demolition preparation step is the first preparation for pulling out the demolition cable from the underground conduit by applying power to the demolition winch to drive it. process; and a second preparation step of arranging the withdrawal cable drawn out from the underground conduit to the driving roller unit.

In the simultaneous construction method for removing and installing a new underground power cable according to an embodiment of the present invention, the connecting step is to install the rotary drum in the selection device, but a plurality of rotary drums corresponding to the number of strands of the new cable of at least one line. A first new establishment process of installing; a second installation process of introducing the new cable from the extraction device into the underground conduit through the inlet manhole; a first assembling step of connecting a connection bracket for new installation to the front end of the new cable and connecting a connection bracket for removal to the rear end of the demolition cable; And it may further include a second coupling step of connecting between the connecting bracket for new installation and the connecting bracket for demolition with a connecting bracket.

In the simultaneous construction method of removing and installing underground power cables according to an embodiment of the present invention, the second coupling step is a main pipe whose inner diameter is formed corresponding to the outer surface of the connecting bracket and a brush formed on the outer circumferential surface of the main pipe. Further comprising a brushing process for coupling the brush unit comprising a, wherein the brushing process removes impurities from the inner surface of the underground conduit when the connection bracket is moved to the inside of the underground conduit to prevent damage to the outer skin of the newly installed cable. can be characterized for

In the simultaneous construction method of removing and installing a new underground power cable according to an embodiment of the present invention, the cable replacement step is to arrange a cut portion on one side of the drive roller portion, so that the removed cable delivered through the drive roller portion is cut through the cut portion. It may further include a cutting process of cutting to a predetermined length through.

In the simultaneous construction method for removing and installing a new underground power cable according to an embodiment of the present invention, the cutting step separates the sheath, which is an insulator, and the copper wire, which is a conductor, before connecting the front end of the removed cable to the cut portion. In order to do this, a separation unit connection step of connecting the front end of the removal cable to the stripping skin may be further included.

Simultaneous construction method of demolition and new installation of underground power cables according to the present invention is to mutually connect the rear end of the demolition cable and the front end of the new cable with a connection bracket to remove the demolition cable and at the same time introduce the new cable into the underground conduit and install it. Therefore, there is an advantage in that the work process can be reduced compared to the process of installing a new one after the removal of the existing cable, so that the cable can be installed quickly and the fatigue of the operator can be minimized.

In addition, by cutting the demolition cable to a certain length while being transported to the cutting unit, the withdrawal and cutting of the demolition cable can be performed simultaneously, minimizing working time and worker's fatigue, and preventing worker safety accidents in advance. There are advantages.

In addition, by separating the sheath, which is a conductor of the removed cable, and the copper, which is an insulator, additional work for recycling the removed cable can be omitted.

In addition, a brush process of coupling the brush part to the outer circumferential surface of the connection bracket is further included, so that when the new cable is moved to the inside of the underground pipe, the brush removes impurities from the inner surface of the underground pipe to prevent damage to the outer skin of the new cable. It has the advantage of improving the construction quality as the new cable located inside the pipeline can be used for a long time.

In addition, by rotating the connecting bracket connecting the rear end of the removed cable and the front end of the new cable in an axis in the longitudinal direction to prevent twisting of the cable, there is an advantage in that the cable can be quickly removed and installed.

1 is a process diagram showing a simultaneous construction method of demolition and new installation of an underground power cable according to an embodiment of the present invention.

2 is a conceptual diagram showing the concept of FIG. 1 using a replacement device for underground power cables.

Figure 3 is an exemplary view showing the drive roller portion of the simultaneous construction method of demolition and new installation of underground power cables according to an embodiment of the present invention.

Figure 4 is an exemplary view showing the peeling of the simultaneous construction method of demolition and new installation of an underground power cable according to an embodiment of the present invention.

Figure 5 is a process chart showing in detail the simultaneous construction method of demolition and new installation of underground power cables according to an embodiment of the present invention.

6 is a conceptual diagram showing a new installation process among the connection processes of the simultaneous construction method of demolition and new installation of an underground power cable according to an embodiment of the present invention.

7 is an exemplary view showing a connection fitting and a connecting fitting for a connection process of a simultaneous construction method of demolition and new installation of an underground power cable according to an embodiment of the present invention.

8 is an exemplary view showing a state in which the brush unit is coupled to the connection bracket of FIG. 6;

9 is a conceptual diagram showing a demolition process of a simultaneous construction method of demolition and new installation of an underground power cable according to an embodiment of the present invention.

Hereinafter, preferred embodiments in which a person skilled in the art can easily practice the present invention will be described in detail with reference to the accompanying drawings. However, in the detailed description of the operating principle of the preferred embodiment of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

In addition, the same reference numerals are used for parts having similar functions and actions throughout the drawings.

In addition, when a part is said to be 'connected' to another part in the entire specification, this includes not only the case where it is directly connected but also the case where it is indirectly connected with other components intervening therebetween. In addition, 'including' a certain component means that other components may be further included without excluding other components unless otherwise stated.

Hereinafter, a simultaneous construction method for removing and installing a new underground power cable according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a process diagram showing a simultaneous construction method of demolition and new installation of 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 a replacement device for an underground power cable, and FIG. It is an exemplary view showing the drive roller part of the simultaneous construction method of demolition and new installation of an underground power cable according to an embodiment of the present invention, and FIG. 5 is a process diagram specifically showing the simultaneous construction method of demolition and new installation of an underground power cable according to an embodiment of the present invention, and FIG. 6 is a process diagram showing the removal and It is a conceptual diagram showing the new construction process among the connection processes of the simultaneous construction method of the new establishment, and FIG. FIG. 8 is an exemplary view showing a state in which the brush part is coupled to the connection bracket of FIG. 6, and FIG. 9 is a conceptual diagram showing a demolition process of a simultaneous construction method of removing and installing a new underground power cable according to an embodiment of the present invention. am.

As shown in FIG. 1, the simultaneous construction method (S10) of demolition and new installation of underground power cables according to an embodiment of the present invention includes a demolition preparation process (S100), a connection process (S200) and a cable replacement process (300). include

More specifically, as shown in FIGS. 1 and 2, the simultaneous construction method (S10) of demolition and new installation of an underground power cable according to an embodiment of the present invention is a winch for demolition in which the rope 110 for demolition is wound. In (100), the demolition preparation step (S100) of pulling the demolition rope into the withdrawal manhole (11) and connecting it to the demolition cable (DC), the leading end of the new cable (NC) wound around the rotating drum (RD) into the lead-in manhole ( 12) through the connection process (S200) of connecting the rear end of the demolition cable installed in the underground pipeline and the demolition cable is inserted into the driving roller unit 200, and the demolition cable is removed by driving the driving roller unit and a new cable is removed at the same time It includes a cable replacement process (S300) to lead it into the underground pipe.

Here, as shown in FIG. 2, the simultaneous construction method (S10) of demolition and new installation of underground power cables according to an embodiment of the present invention is provided with an underground power cable replacement device 10 on one side of the withdrawal manhole 11 and positioned on one side of the inlet manhole 12, respectively.

Such an underground power cable replacement device 10 includes a winch for removal 100, a driving roller unit 200, a peeling skin 300, a cutting unit 400, and a picking device 500.

The winch 100 for removal is seated in a loading box of a means of transportation, such as a vehicle, and driven by applied power to wind or unwind the rope 110 for removal.

It is preferable that the rope 110 for removal is fixed through one side or end of the removal cable DC and a wire or band.

Referring to FIG. 3 , the driving roller unit 200 is provided in a vehicle in which the winch 100 for removal is mounted and serves to wind or unwind the rope 110 for removal.

In addition, the drive roller unit 200 forms a plurality of support walls 210, is rotatably installed on the support wall 210 and is spaced apart from at least one upper roller 220 and a predetermined distance from the upper roller 220. It includes a cylinder 240 that provides a pressing force while raising and lowering the lower roller 230 and the upper roller 220, and a motor 250 that transmits power to the lower roller (230).

In addition, the drive roller unit 200 further includes a gear 260.

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

Referring to FIG. 3 , the peeling skin 300 is disposed on one side of the driving roller unit 200 to separate the copper wire from the coating of the withdrawal cable DC passing through the driving roller unit 200 .

To this end, the peeling skin 300 induces a plurality of lower blades 310 and an upper blade 320 disposed at a predetermined distance from the lower blade 310 and a removal cable (DC) to remove the lower blade 310 and the upper blade 310. The plurality of transfer pipes 330 that guide the blades 320 to come into contact with the sheath of the withdrawal cable DC, and the outer circumference of the transfer tube 330 where the lower blades 310 and upper blades 320 are located are open. The disconnected cable DC is formed by including an opening 340 exposed to the top and bottom of the transfer pipe 330.

Referring to FIG. 2 , the cutting unit 400 is disposed on one side of the drive roller unit 200 and serves to cut the removal cable DC passing through the peeling skin 300 .

For example, if the cable of about 250 ~ 300M is pulled out to the side of the road after pulling out the cable from the withdrawal manhole, the traffic control section becomes longer and there is a problem in the safety of passing vehicles and workers.

In order to improve this, it is preferable to cut the demolition cable (DC).

2 and 6, the selection device 500 is seated in a loading box of a means of transportation, such as a vehicle, is disposed on one side of the withdrawal manhole 12, and serves to lay the new cable NC as an underground pipeline. .

The selection device 500 forms a partitioned frame so that a plurality of rotary drums RD can be installed.

Also, the pick-up device 500 further includes an inlet roller 510 and a tension roller 520.

At least one inlet roller 510 is provided on one side of the frame to increase the discharge speed of the new cable NC unwound from the rotary drum RD.

The tension roller 520 is disposed in the underground conduit where the withdrawal manhole 11 is located to maintain the tension of the pulling cable DC pulled by the drive of the driving roller unit 200.

In this way, as shown in FIGS. 2 and 5, the demolition preparation process ( S100) is performed first.

To this end, the demolition preparation process (S100) further includes a first preparation process (S110) and a second preparation process (S120).

The first preparation step (S110) is a step of pulling out the removal cable (DC) from the underground pipeline by applying power to the removal winch 100 and driving it.

That is, the vehicle on which the winch 100 for removal is seated is placed on one side of the withdrawal manhole 11, and the rope 110 for removal wound around the winch 100 for removal is drawn into the withdrawal manhole 11. Connect the demolition cable (DC) installed to the withdrawal manhole (11).

And pulling the removal rope 110 by driving the removal winch 100 to withdraw the removal cable (DC) from the underground pipeline.

The second preparation process (S120) is a process of arranging the withdrawal cable (DC) drawn out from the underground conduit to the drive roller unit 200.

To this end, the removal rope 110 connected to the distal end of the dismantling cable DC is removed, and the distal end of the dismantling cable DC is inserted into the drive roller unit 200 as in the cable replacement process (S300) to be described later.

Referring to FIGS. 2 and 5, in the connection process (S200), the distal end of the new cable (NC) wound around the rotating drum (RD) is connected to the back of the demolition cable (DC) installed in the underground pipeline through the inlet manhole (12). It is the process of connecting the ends.

To this end, a first new establishment process (S210), a second new establishment process (S220), a first combining process (S230), and a second combining process (S240) are further included.

The first new installation process (210) is a process of installing a plurality of rotary drums (RD) corresponding to the number of strands of the new cable (NC) of at least one line while installing the rotary drum (RD) in the pick-up device (500).

Here, the rotary drum (RD) is installed for two lines, and since one line is made of three cables, a total of six are installed in the embodiment of the present invention.

In addition, in the embodiment of the present invention, it is possible to install only one line as well as two lines.

Referring to FIG. 6, the second new installation process (S220) is a process of introducing the new cable (NC) selected from the selection device 500 into the underground pipe through the inlet manhole 12.

That is, in the second new installation process (S220), the new cable NC wound around the rotating drum RD is connected to the lead-in roller 510 to prevent the new cable NC from bending when it is introduced into the underground pipe.

At this time, when the new cable (NC) enters the inlet manhole (12) in the direction wound on the rotating drum (RD), it forms a 'C' shape to suppress the occurrence of artificial bending, thereby preventing the neutral wire from being bent It can be done.

For example, in the conventional cable pull-in method shown in FIG. 6 (a), when the cable is pulled in, the position of the rotating drum is arranged in a straight line with the direction of the laid cable to minimize the pull-in tension generated during pull-in, but rotation There is a problem in that a part of the cable is bent due to a height difference from the position of the drum to the underground pipe. Due to this, there is a problem that the neutral wire inside the cable is damaged.

On the other hand, in the present invention shown in FIG. 6 (b), when the cable is pulled in, the position of the rotating drum is disposed in the same direction as the direction of the laid cable, so that the cable is drawn into the underground pipe while forming a 'C' shape. . Due to this, the pull-in tension is higher than that of the conventional method, but there is an advantage in preventing damage to the neutral wire.

At this time, it is possible to solve the problem of high pulling tension through the above-mentioned drawing roller 510.

5 and 7, in the first coupling process (S230), the connection bracket 600 for new installation is connected to the front end of the new cable NC, and the connection bracket for removal is connected to the rear end of the demolition cable DC. 600) is the process of connecting.

Here, the connection bracket 600 is formed of a ring in which a connection line connected to one end of each falling eye connected to a power cable made of three strands is formed, and one side of the connection line is gathered.

Therefore, in the first coupling process (S230), the connection bracket 600 for removal is first connected to the rear end of the removal cable (DC) composed of three strands, and the new cable (NC) drawn into the inlet manhole 12 By connecting the new connection bracket 600 to the front end of the ring is arranged to face each other.

The second coupling step (S240) is a process of connecting between the connecting bracket 600 for new installation and the connecting bracket 600 for demolition with the connecting bracket 700.

Here, the connection bracket 700 has a shaft portion extending in the longitudinal direction, and is formed as a fastening ring to which the rings of the connection bracket 600 are fastened on both sides of the shaft portion, so that the rear end of the removal cable (DC) and the new cable (NC) ) are connected to each other.

In particular, since the connection bracket 700 is manufactured according to the length of the continuity test rod, the pipe continuity test can be performed concurrently during the cable replacement operation. Accordingly, it serves to prevent in advance problems caused by inability to conduction of the pipe.

As such, the second coupling step (S240) connects the rear end of the demolition cable (DC) and the front end of the new cable (NC) using the connection bracket 700 to remove the conventional demolition cable, followed by the process of removing the new cable (NC). It is possible to shorten the process of installing a new cable, thereby reducing the cost of manpower and shortening the working time.

On the other hand, as shown in FIG. 8, the second coupling step (S240) of the simultaneous construction method (S10) of removing and installing a new underground power cable according to an embodiment of the present invention further includes a brush step (S241).

The brush process (S241) is a process of coupling the brush unit 800 made of a brush formed on the outer circumferential surface of the main pipe and the main pipe whose inner diameter is formed to correspond to the outer surface of the connecting bracket 700.

In particular, the brush process (S241) is a process for preventing damage to the outer skin of the new cable (NC) by removing impurities from the inner surface of the underground pipe when the connecting bracket 700 is moved to the inside of the underground pipe.

In other words, the brush process (S241) pulls the demolition cable (DC) in the cable replacement process (S300), and as the new cable (NC) moves to the underground pipe, the connection bracket 700 moves into the underground pipe. Upon entry, it contacts the inner surface of the underground pipe to remove impurities.

Due to this, the new cable (NC) can be laid in the underground pipe while cleaning the inner surface of the underground pipe. In addition, it is possible to use it without replacement for a long time by preventing damage to the outer skin of the new cable (NC) in contact with the inner surface of the cleaned underground pipe.

5 and 9, in the cable replacement process (S300), the removal cable (DC) is inserted into the driving roller unit 200, and the removal cable (DC) is removed by driving the driving roller unit 200 and at the same time This is the process of introducing the new cable (NC) into the underground pipeline.

In the cable replacement process (S300), the removal cable (DC) is disposed on the drive roller unit 200 through the removal preparation process (S100) before removing the removal cable (DC). Then, the second new installation process (S220) of introducing the aforementioned new cable (NC) into the inlet manhole (12) is performed.

Thereafter, the front end of the new cable NC is connected to the rear end of the removed cable DC using the connection bracket 600 and the connection bracket 700 in the connection process (S200).

Next, the front end of the withdrawal cable DC is inserted into the driving roller unit 200, and the driving roller unit 200 is driven.

At this time, as the removal cable (DC) is pulled, the new cable (NC) moves in the direction in which the removal cable (DC) is pulled, and is introduced into the underground conduit, so that the cable can be removed and laid simultaneously.

5 and 9, the cable replacement process (S300) further includes a cutting process (S310).

The cutting process (S310) is a process of arranging the cutting unit 400 on one side of the driving roller unit 200 and cutting the demolition cable DC transmitted through the driving roller unit 200 into a predetermined length through the cutting unit 400. am.

Due to this, it is possible to solve the conventional problem that a worker cuts a long cable DC completely with a cutter after placing it on the road in a state where it is completely withdrawn from the manhole.

In particular, it is preferable to withdraw the demolition cable (DC) from the manhole, cut it to a certain length while transporting it, and load the cut demolition cable into another means of transportation.

For example, the cutting length of the demolition cable is preferably 2 to 3M. If it is cut within 2M, the withdrawal and cutting work time of the long demolition cable will be delayed. In addition, if it is 3M or more, it is difficult to bundle the cut cables and it is not easy to transport the bundled demolition cables when loading.

On the other hand, as shown in FIGS. 2 and 4, the cutting process (S310) of the simultaneous construction method (S10) of demolition and new installation of underground power cables according to an embodiment of the present invention further includes a separation unit connection process (S311). do.

Separation unit connection process (S311) is the removal of the removal cable (DC) to the stripping skin 300 in order to separate the sheath, which is the insulation of the removal cable, and the copper wire, which is the conductor, before connecting the front end of the removal cable (DC) to the cutting unit (400). This is the process of connecting the front ends.

In more detail, in the separation unit connection process (S311), the removal cable (DC) passing through the drive roller unit 200 is inserted into the transfer pipe 330, and the opening cut on one side of the transfer pipe 330 ( 340), the sheath of the demolition cable (DC) is exposed.

At this time, the lower blade 310 and the upper blade 320 disposed in the opening 340 cut the sheath of the withdrawal cable DC in the vertical direction. Then, the upper and lower parts of the disconnected cable (DC) are transported to the cutting unit 400, cut to a certain length, and then delivered to a transport vehicle.

As described above, the detailed description of the present invention has been described with respect to the preferred embodiments of the present invention, but this is the best embodiment of the present invention described by way of example, but does not limit the present invention. In addition, it is of course possible for anyone having ordinary knowledge in the technical field to which the present invention belongs to various modifications and imitations without departing from the scope of the technical idea of the present invention.

Therefore, the scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. And without departing from the subject matter of the present invention claimed in the claims, anyone with ordinary knowledge in the art to which the invention pertains is considered to be within the scope of the claims of the present invention to various extents that can be modified.

Claims (4)

A demolition preparation step of drawing the demolition rope from the demolition winch in which the demolition rope is wound into the withdrawal manhole and connecting it to the demolition cable; A connection step of connecting the front end of the new cable wound around the rotating drum to the rear end of the demolition cable installed in the underground pipeline through the inlet manhole; and A cable replacement step of inserting the removal cable into the drive roller unit, pulling the new cable into the underground conduit while the removal cable is removed by driving the drive roller unit, The connection process A first new installation process of installing the rotary drum to the picking device and installing a plurality of rotary drums corresponding to the number of strands of at least one new cable; a second installation process of introducing the new cable from the extraction device into the underground conduit through the inlet manhole; a first assembling step of connecting a connection bracket for new installation to the front end of the new cable and connecting a connection bracket for removal to the rear end of the demolition cable; and Connecting between the connecting bracket for new installation and the connecting bracket for demolition with a connecting bracket, by combining a main pipe whose inner diameter corresponds to the outer surface of the connecting bracket and a brush portion formed of a brush formed on the outer circumferential surface of the main pipe, A second coupling process including a brushing process for preventing damage to the outer skin of the newly installed cable by removing impurities from the inner surface of the underground conduit when the connection bracket is moved into the underground conduit; The connection bracket includes a rod-shaped falling eye and a ring formed on one side of the falling eye, The connection bracket has a shaft portion extending in the longitudinal direction, and is formed of fastening rings to which the rings of the connection bracket are fastened on both sides of the shaft portion to connect the rear end of the removal cable and the front end of the new cable to each other to connect the cable Characterized in that it is possible to carry out the replacement process Simultaneous construction method of demolition and new installation of underground power cable. According to claim 1, The demolition preparation process A first preparation step of pulling out the removal cable from the underground conduit by applying power to the removal winch and driving it; and Further comprising a second preparation step of arranging the withdrawal cable drawn out from the underground conduit to the drive roller unit Simultaneous construction method of demolition and new installation of underground power cable. According to claim 1, The cable replacement process Further comprising a cutting step of disposing a cutting portion on one side of the driving roller portion and cutting the removal cable transmitted through the driving roller portion into a predetermined length through the cutting portion. Simultaneous construction method of demolition and new installation of underground power cable. According to claim 3, The cutting process Before connecting the distal end of the dismantling cable to the cutting unit, further comprising a separation unit connecting step of connecting the distal end of the dismantling cable to the stripping skin in order to separate the sheath, which is an insulator, and the copper wire, which is a conductor, of the dismantling cable. Simultaneous construction method of demolition and new installation of underground power cable.

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