KR102440835B1 - Long distance pulling installation of underground power cable and control Method thereof - Google Patents

Abstract

The present invention relates to an underground power cable long-distance laying apparatus and a control method therefor, provided with a pusher that pushes a cable, and by synchronizing the operating speed of the pusher and the puller to reduce the cable tension, cable damage is prevented, and the installation distance is increased has the effect of being

Description

Long distance pulling installation of underground power cable and control method thereof

The present invention relates to an apparatus for laying an underground power cable and a method for controlling the same, and more particularly, to an apparatus for installing a long-distance underground power cable capable of increasing the installation distance of a cable while preventing damage to the cable and a method for controlling the same.

The underground power distribution method is advantageous in protecting the power line from the external environment, so it can supply power stably, and its application is continuously increasing because it helps the aesthetics of the city.

As shown in Figure 1, the underground power cable (hereinafter referred to as cable 1) is installed inside the pipeline 2 installed in advance underground, and the cable is connected to a lead wire 3 installed first in the pipeline And, by pulling the lead wire 3 with a puller (using a winch, etc.) 4, the cable 1 is pulled into the conduit 2 to be installed. This installation operation is called pulling. Unexplained reference numeral 5 denotes a cable drum on which a cable is wound.

During the pulling operation, tension is generated in the cable due to the traction force, and excessive tension causes damage to both the conductor and the sheath of the cable.

The tension of the cable is affected by various factors such as the magnitude of the traction force, the traction speed, the friction between the cable and the underground pipeline, and the weight of the cable. Accordingly, there is a limitation in the installation distance that can be installed with one cable.

Theoretically, it can be installed up to 750m, but in practice, it is safely installed within 350m (standard span), and manholes are installed in each standard span to connect cables installed in each section. As described above, by installing a manhole in the middle of the installation section and connecting the cable, there was a problem in that the construction cost increases and the cause of cable failure increases.

Republic of Korea Patent Publication No. 10-1779811 (Registered on Sep. 13, 2017)

Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to provide an underground power cable long-distance installation apparatus and a control method thereof, which can increase the cable installation distance by reducing the cable installation tension.

The underground power cable long-distance installation device according to the present invention for achieving the above object is installed on the ground and installed in a cable drum for releasing the cable, and the cable is installed inside the underground manhole into which the cable is introduced and pulling the cable into the manhole. A pusher for pushing into the connected pipe, a puller installed on the ground adjacent to the manhole from which the cable is drawn out and pulling a cable by winding a lead wire connected to the cable, and the cable drum, pusher and puller according to the tension applied to the cable It includes an integrated control unit to control the.

The pusher includes a frame including a flat base, and a pushing module that pushes the cable by a plurality of upper and lower wheels installed and rotated on the base of the frame.

The pushing module includes a lower mount part mounted on the base, an upper mount part mounted on the upper rear end of the lower mount part, an elevating part installed to be movable up and down in an oblique direction on the upper mount part, and the lower mount part The lower wheel is rotatably installed, and the upper wheel is rotatably installed at a lower end of the lifting unit, and a first power device installed in the base unit and connected to a rotation shaft of the lower wheel to rotate the lower wheel.

A connecting member connects both wall surfaces of the upper mount part, guide parts are formed at both ends of the connecting member, and both arms of the lifting part are inserted between the guide part and both side walls of the upper mount part. guided

An operation handle is rotatably installed on the upper end of the lifting unit, and a screw shaft connected to the operation handle is spirally coupled to a nut formed in the connection member, and the operation handle is rotated to move the upper wheel up and down.

A second power device for rotating the screw shaft is installed in the upper mount portion.

An end portion is installed in an upright state at the front and rear ends of the frame, and a cable guide is installed at the end portion for guiding an inlet and out route of a cable.

The cable guide includes a mounting bracket, vertical rollers installed at left and right ends of the mounting bracket, and horizontal rollers installed at upper and lower ends of the mounting bracket.

Among the horizontal rollers, an upper horizontal roller has one end hinged to a mounting bracket and installed on a rotation rod installed to enable rotation operation.

A cylindrical guide is installed horizontally on the mounting bracket.

The cylindrical guide includes a lower semi-cylindrical part integrally mounted on the mounting bracket, and an upper semi-cylindrical part for opening and closing the upper part of the lower semi-cylindrical part, and each hinge piece is formed on one side of the lower semi-cylindrical part and the upper semi-cylindrical part, The hinge pieces are hinge-rotatably connected through a bolt, and each coupling piece is formed on the other side of the lower semi-cylindrical part and the upper semi-cylindrical part, so that they can be coupled and fixed to each other with bolts.

In addition, the control method of the underground power cable long-distance laying device according to the present invention includes a device starting step of starting the cable drum, the pusher and the puller, and the measured tension value measured by the tension sensor installed in the cable drum, the pusher and the puller after the device starting step A cable tension adjustment step of adjusting the tension of the cable by comparing the maximum installation tension value, the reference tension value, and the limit tension value input to the integrated control unit and controlling the speed of the pusher according to the result, and the cable tension adjustment step ( S20) includes a device stopping step of stopping the operation of the cable drum, pusher, and puller when the measured tension value becomes greater than the limit tension value during execution.

The device starting step is started in the order of the cable drum, the pusher, and the puller along the moving direction of the cable.

The device stopping step is stopped in the order of the puller, the pusher, and the cable drum along the reverse direction of the cable movement direction.

In the cable tension adjustment step, the integrated control unit may take the larger of the two values measured by the respective tension sensors of the pusher and the puller as the measured tension value.

In the step of adjusting the cable tension, the integrated control unit may take an average value of two values measured by each of the pusher and the puller as the measured tension value.

In the cable tension adjustment step, when the measured tension value is less than the reference tension value, the speed of the pusher is maintained, and when the measured tension value is greater than the reference tension value, the speed of the pusher is increased.

In the cable tension adjustment step, if the cable laying speed measured by each speed sensor installed on the cable drum, pusher, and puller is less than the set reference speed, the pusher speed is maintained, and if it is greater than the reference speed, the puller, pusher, and cable drum are in the order Reduce the operating speed.

In the cable tension adjusting step, the upper wheel is moved downward by controlling the operation of the second power device provided for adjusting the position of the upper wheel of the pusher, thereby increasing the contact area between the upper wheel and the lower wheel and the cable. output can be increased.

The air pressure measured by the pressure sensor installed inside the lower wheel is compared with a set reference value, and when the measured air pressure is greater than the reference value, the operation of the second power unit is controlled to stop the lower wheel from descending.

According to the present invention as described above, since it is possible to push the cable using the pusher, there is an effect that the cable laying tension is reduced.

As described above, the cable installation length (distance) is increased by reducing the cable installation tension, and thus the installation number of manholes for cable connection is reduced, thereby reducing the construction cost, and reducing the number of connection parts of the cable to reduce cable failure there is

In addition, it is possible to measure the cable tension in real time and control the operation of the pusher accordingly to keep the cable tension below the set installation limit tension value.

Accordingly, excessive tension is not applied to the cable, thereby preventing damage to the cable.

1 is a block diagram of an underground power cable long-distance installation device according to the prior art.
Figure 2 is a block diagram of the underground power cable long-distance installation apparatus according to the present invention.
Figure 3 is a perspective view showing the pusher as a main configuration of the present invention from the front.
4 is a perspective view showing the pusher from the rear;
5 is a side view of the pusher;
6 is a plan view of the pusher.
7 is a perspective view of a cable guide mounted on the pusher and used;
8 is a reverse perspective view of the cable guide.
Figure 9 is a block diagram showing the configuration of the underground power cable long-distance laying apparatus according to the present invention.
10 is a flowchart of a method for controlling an underground power cable long-distance laying device according to the present invention.
11 is a block diagram illustrating a device startup sequence in the control method.
12 is a block diagram illustrating a device stop sequence in the control method.
13 is a schematic diagram showing a control method for adjusting the cable laying speed using a speed sensor provided in each device.
14 is a schematic view of the pusher showing the installation position of the pressure measuring sensor.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. The thickness of the lines or the size of components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or precedent of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic configuration diagram of the underground power cable long-distance installation apparatus according to the present invention, the underground power cable long-distance installation apparatus according to the present invention is a cable drum 100, a pusher (Pusher) 200, a puller (Puller) (300) ) and an integrated control unit 400 for controlling their operation.

The cable drum 100 is installed on the ground and is a device for unwinding the cable 1 wound around the drum device.

The pusher 200 is installed inside the manhole 6 buried underground at the rear of the cable drum 100 , and pulls the cable released from the cable drum 100 and pushes it toward the puller 300 .

The puller 300 is installed at the rear of the pusher 200, and is installed on the ground adjacent to another manhole 6 ′ connected to the pusher 200 side manhole 6 and the conduit 2, and to the cable 1 It is a device that winds up the connected lead wire (3) and pulls the cable (1).

The manholes 6 and 6' are installed at both ends of the cable (1) installation section, respectively, and the manholes 6 are connected by a pipe line 2 .

The cable released from the cable drum 100 is introduced into the pusher 200, and the pusher 200 pushes the cable, and at the same time, the puller 300 pulls the cable, so that the cable is pulled from the pusher 200 side by the puller 300. ), the installation is made while proceeding along the inside of the pipe (2).

As described above, since the puller 300 pulls the cable 1 and the pusher 200 pushes the cable 1 toward the puller 300, the tension applied to the cable moving the conduit 2 is reduced. .

Therefore, excessive tension is applied to the cable and the conductor or the outer sheath of the cable is physically damaged.

The cable drum 100 includes a drum device 110 driven by the power device 120 , and the drum device 110 is operated by the power device 120 while the cable is wound around the drum device 110 and stored. and the cable is released (refer to FIG. 9).

The puller 300 includes a drum device 310 driven by a power unit 320, and the drum unit 310 is operated by the power unit 320 to wind the lead wire 3, thereby winding the cable 1 ) to be able to pull (see FIG. 9).

The pusher 200 includes a frame 210 , a pushing module 220 , and a cable guide 230 as shown in FIGS. 3 to 6 . Arrow A indicates the direction of cable travel.

The frame 210 provides a place to install the pushing module 220, which is the main component of the pusher 200, and includes a base portion 211 forming a rectangular flat bottom, and front and rear ends of the base portion 211. It includes an end portion 212 that is installed in an upright state.

A plurality of pushing modules 220 are mounted on the base portion 211 , and a cable guide 230 for guiding and limiting an inlet and out route of a cable is installed on the end portion 212 .

In general, since three-phase cable laying is a principle, the drawing shows an embodiment in which three pushing modules 220 are installed to transport three cables, but if necessary, the number of applications of the pushing module 220 and the cable guide 230 is can be deducted.

After each cable passes through the corresponding pushing module 220, it is gathered into one by a pulling eye or a pulling grip, and the lead wire 3 is connected to a pulling eye or a pulling grip to pull the cable.

The pushing module 220 includes a lower wheel 221 , an upper wheel 222 , and a first power device 223 for driving the lower wheel 221 .

The lower wheel 221 and the upper wheel 222 are arranged vertically as shown, and the lower wheel 221 is rotatably installed on the lower mount unit 224 mounted on the base unit 211, and the upper wheel ( 222 is rotatably and vertically movable in the upper mount 225 mounted on the upper rear end of the lower mount 224 .

The lower wheel 221 and the upper wheel 222 are made of a rubber material and are filled with air to maintain their shape and strength.

The outer peripheral surfaces of the lower wheel 221 and the upper wheel 222 are made of smooth surfaces to be easily pushed in close contact with the cable.

The first power device 223 directly rotates the lower wheel 221 , and is connected to the motor 223a for generating rotational power and the motor 223a to reduce the number of rotations and increase the torque, and the rotation shaft of the motor. Includes a gearbox (223b) for converting the output direction of the right angle.

The first power unit 223 is mounted on the side of the lower mount unit 224 in the base unit 211 , and the output shaft of the gearbox 223b is connected to the rotation shaft of the lower wheel 221 .

The cable 1 passes between the lower wheel 221 and the upper wheel 222, and at this time, the outer periphery of the lower wheel 221 and the upper wheel 222 by the cable's own weight and the pressing force of the upper wheel 222. It rubs against the surface and is pushed by the lower wheel 221 and the upper wheel 222 to move. The direction of movement of the cable 1 is the direction of arrow A shown.

The degree to which the pushing module 220 pushes the cable (force and speed) is affected not only by the rotation speed of the lower wheel 221 , but also by the force of the upper wheel 222 pressing the cable toward the lower wheel 221 .

Therefore, the upper wheel 222 is installed in a structure capable of adjusting the vertical position so that the pressing force of the upper wheel 222 can be adjusted in order to control the degree of pushing the cable.

To this end, a fork-shaped (U-shaped, U-shaped) lifting unit 226 is installed in the upper mount unit 225 to move in an inclined up-down direction, and the upper wheel 222 is disposed between the arms of both sides of the lifting unit 226 . ) is installed.

A guide portion 225b is formed at both ends of the connecting member 225a connecting the upper portions of both wall surfaces of the upper mount portion 225 to each other, and a lifting portion between the guide portion 225b and the opposite wall surfaces of the upper mount portion 225 . The both arms of 226 are inserted, so that the vertical movement of the lifting unit 226 is guided in the oblique direction by the guide unit 225b.

A circular operation handle 227 is rotatably installed on the upper end of the lifting unit 226 , and a screw shaft 228 is connected to the operation handle 227 .

The screw shaft 228 is spirally coupled through the nut formed in the middle portion of the connecting member 225a.

Therefore, when the screw shaft 228 is rotated by turning the operation handle 227, the screw shaft 228 is moved up and down with respect to the nut portion of the connection member 225a in which the position is fixed according to the rotation direction, and the elevating part 226 ) and the operation handle 227 are vertically moved integrally with the screw shaft 228 .

Since the vertical position of the lifting unit 226 can be adjusted as described above, the vertical position of the upper wheel 222 mounted on the lower end of the lifting unit 226 can be adjusted, so that the cable 1 is pressed against the lower wheel 221 . You can control the force.

Meanwhile, the upper and lower positions of the upper wheel 222 may be adjusted manually as described above, but a separate power device for driving the manipulation handle 227 or the screw shaft 228 is installed in the upper mount unit 225 . Of course, it can also be adjusted automatically. The power device for adjusting the vertical position of the upper wheel 222 will be referred to as a second power device 229 , and the second power device 229 is briefly indicated in FIG. 9 . Rotational manipulation of the rotating target part (the manipulation handle 227 or the screw shaft 228) using a power device using a motor rotational force can be easily performed in various conventional methods, and thus a detailed description thereof will be omitted.

As described above, the cable guide 230 is installed on the upper end of the front and rear end portions 212 of the frame 210 to stably guide the movement path of the cable entering the pushing module 220 and the cable being drawn out. will be.

In order to guide the route so that the cable can be stably drawn in and out, the cable guide 230 includes two rollers that are basically arranged vertically and parallel, and the two rollers are arranged in parallel on the left and right in a direction orthogonal to the two rollers. It includes a total of four rollers forming a rectangle, such as two rollers that become These rollers may be installed directly on the end portion 211 of the frame 210 as shown in FIGS. 3 to 5, and also on a separate mounting bracket 231 as shown in FIGS. 7 and 8. can be installed. When the rollers are installed on a separate mounting bracket 231 and the cable guide 230 is separately modularized with respect to the frame 210 , it is easy to attach and detach the cable guide 230 to the end part 212 in the required number.

As shown, two rollers 232 are installed horizontally on the upper and lower sides of the mounting bracket 231 , and two rollers 233 are installed rotatably on the left and right vertically. In particular, the upper horizontal roller 232 is installed on the rotating rod 234 to easily position the cable into the inner space of the four rollers to open and close the square space by the rollers.

That is, one end is fixed to the upper part of the mounting bracket 231 by a hinge bolt 234a, and a rotation rod 234 rotatable around it is installed, and the upper horizontal roller ( 232) is installed. The other part of the rotating rod 234 can be inserted and supported in the U-shaped groove formed at the upper end of the mounting bracket 231, and it protrudes from the support position to the outside of the mounting bracket 231 to be held by hand and rotated up and down. it is made possible

On the other hand, a phenomenon in which the cable drawn out from the pusher 200 rises upward due to the difference in height between the cable withdrawal position of the pusher 200 and the position of the conduit 2 (see FIG. 2 ) and the tension pulling the cable from the puller 300 . As a result, the cables are not evenly rubbed between the upper wheel 222 and the lower wheel 221, so that the cables are not smoothly pushed out.

Therefore, in order to prevent the cable from rising immediately after being drawn out between the upper wheel 222 and the lower wheel 221, as shown in FIGS. 7 and 8, a cylindrical guide that forms a horizontal path of the cable in the cable guide 230 as shown in FIGS. (235) may be further configured.

The cylindrical guide 235 includes a lower semi-cylindrical portion 235a and an upper semi-cylindrical portion 235b. The lower semi-cylindrical part 235a is horizontally welded to the rear surface of the mounting bracket 231 and integrated, and the upper semi-cylindrical part 235b is mounted to open and close the upper part of the lower semi-cylindrical part 235a.

To this end, hinge pieces 235aa and 235ba are respectively protruded from one side of the lower semi-cylindrical portion 235a and the upper semi-cylindrical portion 235b, and they are hingedly and rotatably connected to each other by bolts. The hinge pieces 235aa and 235ba are formed to form a plane perpendicular to the central axis of the cylindrical guide 235 so that the upper semi-cylindrical part 235b can rotate and open and close the upper part of the lower semi-cylindrical part 235a.

In addition, coupling pieces 235ab and 235bb are formed to protrude from adjacent portions on opposite sides of the lower semi-cylindrical portion 235a and the upper semi-cylindrical portion 235b, and are coupled to each other by bolts. The coupling pieces 235ab and 235bb are formed to form a plane parallel to the central axis of the cylindrical guide 235, so that when the upper semi-cylindrical part 235b covers the upper part of the lower semi-cylindrical part 235a, they are abutted against each other by a bolt. are capable of being combined.

Therefore, in a state in which the bolts coupling the coupling pieces 235ab and 235bb are released, the upper semi-cylindrical part 235b opens and closes the upper space of the lower semi-cylindrical part 235a while rotating around the bolt connecting the hinge pieces 235aa and 235ba. can do.

Therefore, when the upper semi-cylindrical part 235b is opened, the cable is seated therein, the upper semi-cylindrical part 235b is closed, and the coupling pieces 235ab and 235bb are fixed to each other with bolts, and the cable is passed through the inside of the cylindrical guide 235. state can be kept stable.

A plurality of opening holes 235ac and 235bc are formed in the lower semi-cylindrical portion 235a and the upper semi-cylindrical portion 235b, respectively, to reduce the weight of the cable guide 230 and reduce unnecessary friction with the cable during cable installation. made to be able to do it.

A specific structure for mounting the cable guide 230 to the end portion 212 of the frame 210 is not shown in FIGS. 7 and 8 . However, it is conceivable to mount the mounting flange on which the vertical roller 233 is mounted on the upper surface of the end portion 212 using a bolt for installing the vertical roller 233 . In addition, a mounting flange may be additionally molded into a shape required for the mounting bracket 231 and fixed to the upper surface of the end portion 212 with bolts. Mounting the cable guide 230 manufactured as a separate module to the end portion 211 as described above can be easily modified by those skilled in the art in various ways, and thus detailed description thereof will be omitted.

The pusher 200 may be used as a puller by reversing the installation direction.

The integrated control unit 400 is an electronic control unit that automatically controls the operation of the cable drum 100 and the pusher 200 and the puller 300 . In order to implement the electronic control by the integrated control unit 400, that is, the control method of the underground power cable long-distance laying device according to the present invention to be described below, the underground power cable long-distance laying device according to the present invention as shown in FIG. 9, the control unit ( 130,250,330) and communication units 140,260,340. The integrated control unit 400 may control the operation of each device while communicating with the individual control units 130 , 250 , 330 of each device through the communication units 140 , 260 , and 340 .

In addition, each of the cable drum 100, the pusher 200, and the puller 300 is provided with tension sensors 150, 241,350 and speed sensors 160, 242, 360 for measuring the tension and speed of the cable at the corresponding point. The measured values of these sensors are transmitted to the individual control units 130,250,330 provided in each device, and from the individual control units 130,250,330 to the integrated control unit 400 through the communication units 140,260,340, and the integrated control unit 400 provides the measurement information. Based on the control command transmitted to the individual control units 130, 250, 330 of each device to operate each device so that the tension applied to the cable can be reduced based on the control command transmitted from the integrated control unit 400, the individual control units 130, 250, 330 are The corresponding power units 120 , 223 , and 320 are operated.

The pusher 200 further includes a pressure sensor 243 for detecting the pressure applied to the cable in order to adjust the vertical position of the upper wheel 222 .

Now it will be described with respect to the control method of the underground power cable long-distance laying apparatus according to the present invention.

10 is a flowchart showing a control method of the underground power cable long-distance installation apparatus according to the present invention. As shown in FIG. 10, in the method of controlling the installation device according to the present invention, in the device starting step (S10), the tension value T0 measured in real time during the installation operation and the set values are compared to control the speed of the pusher 200 to control the speed of the cable ( 1) includes a cable tension adjusting step (S20) of adjusting the tension, and a device stopping step (S30) of stopping the device operation when the measured tension value (T0) exceeds a set value.

The device starting step (S10) is a step of sequentially operating each individual device constituting the installation device, in order to minimize the tension applied to the cable instantaneously with the startup of each individual device. In order to minimize the cable tension caused by the individual device start-up, it is preferable to start the cable drum 100 first as shown in FIG. 11 , then start the pusher 200 , and finally start the puller 300 .

The reason is that, in the direction of cable movement, if the device located at the back (downstream) is started before the device located at the front (upstream), the cable at the back is pulled between the two devices even though the cable at the front is stopped. This is to prevent the rear device from starting earlier than the front device because the tension increases.

As described above, since each individual device constituting the installation device is sequentially started in the direction in which the cable moves, it is possible to prevent an instantaneous increase in cable tension by the individual device startup.

The cable tension adjustment step (S20) is a step of controlling the speed of the pusher 200 by comparing the set values with the tension value T0 measured during the installation operation.

The integrated control unit 400 includes a maximum installation tension value (TM) previously measured and recorded in previous installation operations, a reference tension value (T1) that is 50% of the maximum installation tension value (TM), and a maximum installation tension value The limit tension value T2, which is 90% of (TM), is set as a comparison value of the measured tension value T0.

When the device is started, measured values from the tension sensors 150 , 241 , and 350 of each individual device are transmitted to the integrated control unit 400 . Meaningful tension values for double cable protection are values measured by the tension sensors 241 and 350 of the pusher 200 and the puller 300 . The value taken as the measured tension value T0 by the integrated control unit 400 may be a larger value of two values measured by the pusher 200 or the puller 300, respectively, or an average value of the two values. For cable protection, it is advantageous to take the larger of the two values measured by the pusher 200 and the pulley 300, respectively.

When the measured tension value T0 is determined, it is compared with the set values T1, T2, and TM, and the speed of the pusher 200 is adjusted according to the result.

When the measured tension value T0 is smaller than the reference tension value T1 (T0<T1<T2), the cable is in a safe state in which there is no risk of being damaged by the tension, and thus the speed of the pusher 200 is maintained.

Otherwise, since the measured tension value T0 is larger than the reference tension value T1, the speed of the pusher is increased. In a situation where the tension on the cable is increasing because the speed of the puller is higher than that of the pusher, if the speed of the pusher is increased and synchronized with the speed of the puller, the tension applied to the cable is reduced.

When the measured tension value (T0) is greater than the reference tension value (T1) and less than the limit tension value (T2) (T1<T0<T2), since the measured tension value (T0) is still greater than the reference tension value (T1) Control to reduce cable tension by increasing the speed of the pusher.

If the measured tension value (T0) is larger than the limit tension value (T2) (T1<T2<T0<TM), it is judged as a dangerous situation where cable damage due to tension may occur, and the measured tension value (T0) is set to the maximum Before reaching the tension value (TM), the device operation stop step (S30) is performed to suppress any further increase in cable tension to prevent cable damage.

That is, the installation device control method according to the present invention maintains the speed of the pusher when the measured tension value (T0) measured during installation is smaller than the reference tension value (T1), and the measured tension value (T0) is the reference tension value (T1) ) or higher, the speed of the pusher is increased, and when the measured tension value (T0) is greater than or equal to the limit tension value (T2), the device operation is stopped.

In this way, it is possible to prevent an increase in cable tension by synchronizing the cable speed on the pusher side and the cable speed on the puller side. It can prevent damage to the cable.

The device stop step (S30) is a step of stopping the operation of the entire installation device when it is determined that the device stop condition (T1<T2<T0<TM) in the previous cable tension adjustment step (S20), as shown in FIG. , the stop of each individual device is made in the order of the puller 300 , the pusher 200 , and the cable drum 100 as opposed to the device starting step ( S10 ).

The reason that each individual device is sequentially stopped in the opposite direction to the direction in which the cable moves when the installation device is stopped is because if the front device is stopped earlier than the rear device, the front part of the cable is stopped between the two devices. However, this is to prevent this because the cable tension increases as the rear part is continuously pulled.

On the other hand, when the speed of the pusher 200 is increased as described above during the installation operation, the installation speed of the cable may be increased. Even if the cable installation speed is too fast, the risk of cable damage increases, so it is necessary to manage the cable installation speed below the standard installation speed (10m/min).

Therefore, the integrated control unit 400 receives speed information in real time from the speed sensors 160, 242, 360 installed in each individual device as shown in FIG. 13, and any one of the input installation speeds V0 exceeds the reference installation speed. In this case, the control is performed to reduce the operating speed of the individual devices in the order of the puller 300 , the pusher 200 , and the cable drum 100 . The operating speed reduction control sequence of the individual devices is the same as the sequence when stopping the individual devices.

If the installation speed V0 transmitted from the speed sensors 160, 242, 360 is smaller than the reference installation speed, the speed of the pusher 200 is maintained.

On the other hand, in order to reduce the cable tension, it is necessary to increase the output of the pusher 200 to increase the force of the cable entering the inside of the conduit (2). In order to increase the output of the pusher, the method of increasing the driving speed of the pusher, that is, the rotational speed of the lower wheel 221, and the contact area between the upper wheel 222 and the lower wheel 221 and the cable 1 as described above. There are ways to increase it. Therefore, when there is a need to increase the pusher output, the upper wheel 222 and the lower wheel 221 and the cable are operated by the second power unit 229 to lower the upper wheel 222 by the pressing force of the upper wheel 222 . The contact area of (1) can be increased.

However, if excessive pressure is applied to the cable, there is a possibility that the outer (sheath) and internal conductors of the cable may be damaged. Therefore, measure the pressure applied to the cable (1), and if the measured pressure exceeds the specified standard, the upper wheel (222) The pressure acting on the cable (1) must be reduced by stopping or re-elevating the descent.

In order to implement this control method, a pressure sensor 243 for measuring the pressure applied to the cable 1 is installed in the pusher 200 . However, since the upper wheel 222 and the lower wheel 221 are rotating and the cable 1 is moving while being strongly pressed between them, it is very difficult to measure the pressing force applied to the cable from the surface of the cable 1 . do.

Therefore, the pressure sensor 243 is installed inside the lower wheel 221 as shown in FIG. 14 . The pressure sensor 243 is an air pressure measuring sensor and measures the internal air pressure of the lower wheel 221 that is changed according to the pressing force of the upper wheel 222 . Since the air pressure of the lower wheel 221 is proportional to the cable pressing force by the upper wheel, the measured value of the pressure sensor 243 can be used to determine whether the pressing force of the upper wheel is appropriate (large or small).

Accordingly, the integrated control unit 400 controls the operation of the second power unit 229 to stop the lowering of the upper wheel 222 when the measured value transmitted from the pressure sensor 243 is greater than a preset reference value. By doing so, it is possible to prevent the cable from being deformed and damaged due to excessive pressure being transmitted to the cable.

According to the underground power cable long-distance installation apparatus and the control method thereof according to the present invention as described above, it is possible to push the cable using a pusher, and at this time, it is possible to reduce the cable tension by synchronizing the operating speed of the pusher and the puller.

As described above, the cable installation distance is increased by reducing the cable installation tension, and accordingly, the number of manholes installed for cable connection is reduced, thereby reducing the construction cost, and reducing the number of connection parts of the cable to reduce the cable failure factor. have.

In addition, by measuring the cable tension in real time and controlling the operation of the pusher accordingly, the cable tension can be maintained below the set installation limit tension value, so that excessive tension is not applied to the cable and damage to the cable is prevented.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those of ordinary skill in the art can make various modifications and equivalent other embodiments therefrom. You will understand that it is possible. Therefore, the true technical protection scope of the present invention should be defined by the following claims.

100: cable drum
200: pusher 210: frame
220: pushing module 221: lower wheel
222: upper wheel 223: first power device
224: lower mount part 225: upper mount part
226: elevating unit 227: operation handle
228: screw shaft 229: second power device
230: cable guide 231: mounting bracket
232, 233: roller 234: rotating rod
235: cylindrical guide
300: fuller
400: integrated control unit

Claims (20)

a cable drum installed on the ground and releasing cables;
a pusher installed inside the underground manhole into which the cable is introduced and pulling the cable and pushing it into the pipe connected to the manhole;
a puller installed on the ground adjacent to the manhole from which the cable is taken out and pulling the cable by winding the lead wire connected to the cable;
Including; and an integrated control unit for controlling the operation of the cable drum, pusher and puller according to the tension applied to the cable;
The pusher includes: a frame including a flat base;
A plurality of pushing modules are installed on the base of the frame and push the cables by the rotating upper and lower wheels; and
The pushing module includes a lower mount part mounted on the base part;
an upper mount part mounted on the upper rear end of the lower mount part;
a lifting unit installed to be movable up and down in an oblique direction on the upper mount unit;
the lower wheel rotatably installed in the lower mount unit;
the upper wheel rotatably installed at the lower end of the lifting unit; and
a first power device installed on the base and connected to the rotation shaft of the lower wheel to rotate the lower wheel;
A connecting member connects both wall surfaces of the upper mount part, guide parts are formed at both ends of the connecting member, and both arms of the lifting part are inserted between the guide part and both side walls of the upper mount part. guided,
An operation handle is rotatably installed on the upper end of the lifting unit, and a screw shaft connected to the operation handle is spirally coupled to a nut formed on the connecting member, and the upper wheel is inclined by rotating the operation handle and moving the lifting unit up and down in an inclined direction. Underground power cable long-distance installation device, characterized in that it can be moved up and down in the direction. delete delete delete delete The method according to claim 1,
An underground power cable long-distance installation device, characterized in that a second power device for rotating the screw shaft is installed in the upper mount part. The method according to claim 1,
An underground power cable long-distance installation device, characterized in that the end portion is installed in an upright state at the front and rear ends of the frame, and a cable guide for guiding the inlet and out route of the cable is installed at the end portion. 8. The method of claim 7,
The cable guide includes a mounting bracket;
vertical rollers installed at left and right ends of the mounting bracket;
Underground power cable long-distance installation device, characterized in that it comprises a horizontal roller installed at the upper and lower ends of the mounting bracket. 9. The method of claim 8,
Among the horizontal rollers, the upper horizontal roller is hinged at one end to a mounting bracket and installed on a rotating rod installed to enable rotation operation. 9. The method of claim 8,
Underground power cable long-distance installation device, characterized in that the cylindrical guide is installed horizontally on the mounting bracket. 11. The method of claim 10,
The cylindrical guide includes a lower semi-cylindrical part integrally mounted on a mounting bracket;
Including;
Each hinge piece is formed on one side of the lower semi-cylindrical part and the upper semi-cylindrical part, and the hinge piece is hinge-rotatably connected through a bolt,
Underground power cable long-distance installation device, characterized in that each coupling piece is formed on the other side of the lower semi-cylindrical part and the upper semi-cylindrical part to be coupled and fixed with each other with bolts. A device starting step (S10) of starting the cable drum of claim 1, the pusher and the puller;
After the device starting step (S10), the measured tension value (T0) measured by the tension sensor installed in the cable drum, the pusher and the puller, the maximum installation tension value (TM) input to the integrated control unit, the reference tension value (T1), a cable tension adjustment step (S20) of comparing the limit tension value (T2) and controlling the speed of the pusher according to the result of adjusting the tension of the cable;
During the cable tension adjustment step (S20), when the measured tension value (T0) becomes greater than the limit tension value (T2), the device stopping step (S30) of stopping the operation of the cable drum, the pusher and the puller;
In the cable tension adjustment step (S20), the upper wheel is moved downward by controlling the operation of the second power device provided for adjusting the position of the upper wheel of the pusher, thereby increasing the contact area between the upper wheel and the lower wheel and the cable. By doing so, the output of the pusher is increased,
By comparing the air pressure measured by the pressure sensor installed inside the lower wheel with a set reference value, if the measured air pressure is greater than the reference value, the operation of the second power unit is controlled to stop the lowering of the upper wheel. Control method of cable long-distance laying device. 13. The method of claim 12,
The device starting step (S10) is a control method of an underground power cable long-distance installation device, characterized in that starting in the order of a cable drum, a pusher, and a puller along the moving direction of the cable. 13. The method of claim 12,
The device stopping step (S30) is a control method of an underground power cable long-distance laying device, characterized in that it stops in the order of a puller, a pusher, and a cable drum along the reverse direction of the cable movement direction. 13. The method of claim 12,
In the cable tension adjustment step (S20), the integrated control unit takes the larger of the two values measured by the respective tension sensors of the pusher and puller as the measured tension value (T0) Control method of an underground power cable long-distance laying device . 13. The method of claim 12,
In the cable tension adjustment step (S20), the integrated control unit controls the underground power cable long-distance laying apparatus, characterized in that it takes the average value of the two values measured by the pusher and the puller as the measured tension value (T0). 13. The method of claim 12,
When the measured tension value (T0) is smaller than the reference tension value (T1) in the cable tension adjustment step (S20), the speed of the pusher is maintained, and when the measured tension value (T0) is greater than the reference tension value (T1), the speed of the pusher Control method of the underground power cable long-distance laying device, characterized in that increasing the. 13. The method of claim 12,
If the cable installation speed (V0) measured by each speed sensor installed in the cable drum, pusher and puller in the cable tension adjustment step (S20) is less than the set reference speed, the pusher speed is maintained, and when it is greater than the reference speed, the puller, pusher , Control method of underground power cable long-distance laying device, characterized in that reducing the operating speed in the order of the cable drum. delete delete

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