KR102470990B1 - Guide apparatus for laying underground power cables - Google Patents

Abstract

The present invention relates to a guide apparatus for laying an underground power cable, which guides a three-phase power cable to be inserted into an entrance of a connection conduit connected to an underground conduit from both inside and outside of a manhole when the three-phase power cable is laid in the underground conduit, thereby enabling smooth underground installation work of the three-phase power cable even without a worker positioned inside the manhole. The guide apparatus for laying an underground power cable, which is provided inside and outside a first manhole when a three-phase power cable is towed from the outside of a second manhole by using pulling equipment to install the three-phase power cable in the underground conduit connecting the first manhole and the second manhole under the ground, comprises: an extended guide tube, which has an extended length running from the outer bottom adjacent to the first manhole to the entrance of the connection conduit so that one end is located on the outer bottom adjacent to the first manhole and the other end is at the entrance of the connection conduit connected to the underground conduit; and a joint member which is connected to the entrance of the connection conduit, accommodates the other end of the extended guide tube internally, and joins the extended guide tube and the connection conduit together.

Description

Guide apparatus for laying underground power cables {Guide apparatus for laying underground power cables}

The present invention guides the three-phase power cable to be introduced into the entrance of the connection pipe connected to the underground pipe from the inside and outside of the manhole when the three-phase power cable is laid in the underground pipe, so that the three-phase power cable is not placed inside the manhole. It relates to a guide device for underground power cable laying that enables smooth underground laying of cables.

In general, an underground power cable refers to a power cable buried underground for the purpose of not damaging the aesthetics of a city or the purpose of preventing damage such as lightning or feng shui.

For the laying work of burying such an underground power cable in the ground, an underground pipeline excavated and formed in a horizontal direction in the underground to embed the power cable, and a plurality of vertically perforated at regular intervals on the underground pipeline to facilitate opening and closing of the cover. Along the way, a manhole is provided so that workers can enter and exit from the ground while accessing the underground pipe.

That is, after opening two manholes adjacent to each other, the traction wire for pulling the power cable is pulled into the inside of the manhole on one side, passed through the underground pipe, and then pulled out through the manhole on the other side, outside the manhole on one side. Connect the front end of the traction wire drawn out to the front end of the power cable and connect the rear end of the traction wire to the pulling device from the outside of the manhole on the other side, then operate the pulling device to wind and pull the traction wire to install the power cable in the underground pipeline can do.

On the other hand, for the underground power cable laying work, a shear guide roller that guides the power cable to smoothly enter the underground pipe line provided inside the manhole from the outside of the manhole on one side, and the power cable smoothly into the underground pipe line inside the manhole on one side. A corrugated conduit for guiding to be pulled in, a lower guide roller for guiding the pull wire to be smoothly drawn out inside the manhole on the other side, and a rear guide roller for guiding the pull wire to be smoothly wound outside the manhole on the other side. It should be provided.

And as the power cable is composed of a total of three power cables as three-phase is applied for high power transmission, the tips of the three-phase power cables must be arranged in a triangular shape, fixed with cable grips, and connected to the tip of the traction wire. .

Here, as the corrugated conduit is provided inside the manhole on one side, at least one worker is always placed inside the manhole on one side so that the three-phase power cable passing through the shear guide roller is smoothly drawn in without getting caught in the corrugated conduit. They must be manually guided so that they are arranged in a triangular shape as much as possible.

Then, as workers must be placed both outside and inside the manhole on one side, if manpower is insufficient, not only can not properly perform the laying work, but also there is a problem that labor costs increase due to manhole placement.

Therefore, as workers are placed both outside and inside the manhole to lay the three-phase power cable in the underground duct, in order to solve the difficulties caused by the lack of manpower and the rise in labor costs due to manpower placement, workers must be installed inside the manhole. There is an urgent need to develop a guide device for laying underground power cables having a structure that can smoothly perform the laying work without placing a

Republic of Korea Patent Registration No. 10-1439833, 2014.09.17.

The present invention was invented to solve the above problems, and as workers are placed both outside and inside the manhole to lay the three-phase power cable in the underground pipe, the difficulty of the work due to the lack of manpower and the manhole In order to solve the increase in labor costs, the purpose is to provide a guide device for laying underground power cables having a structure that enables smooth laying work without arranging workers inside the manhole.

The object of the present invention is not limited to the purpose mentioned above, and other objects not mentioned above can be clearly understood from the description below and can be sufficiently included in the object of the present invention.

Guide device for underground power cable installation according to the present invention for achieving the above object is from the outside of the second manhole to install a three-phase power cable in an underground conduit connecting between the first manhole and the second manhole provided in the ground. When pulling a three-phase power cable with a pulling device, it is provided inside and outside the first manhole to guide the three-phase power cable to be smoothly drawn into the underground pipe; Having an extended length from the outer floor adjacent to the first manhole to the entrance of the connection pipe so that one end is located on the outer floor adjacent to the first manhole and the other end is connected to the entrance of the connection pipe connected to the underground pipe extended guide tube; and a joint member connected to the inlet of the connecting pipe and accommodating the other end of the extended guide pipe to connect the extended guide pipe and the connecting pipe to each other.

The guide device for underground power cable installation according to the present invention according to the above configuration can expect the following effects.

First, as the joint member in contact with the entrance of the connection pipe and the extension guide pipe having one end located at the outer bottom of the manhole and the other end accommodated and fixed inside the joint member are provided, without placing a worker inside the manhole 3 Since the phase power cable can be guided to be smoothly introduced into the entrance of the underground pipe, the number of workers can be reduced.

In addition, as a shear guide roller is further provided to guide the three-phase power cable to be drawn into the extension guide tube by arranging the three-phase power cable in a triangular shape on the outer floor of the manhole, the three-phase power cable can be smoothly passed through the extension guide tube without getting caught. The operating load of the equipment can be reduced.

1 and 2 are exemplary diagrams showing a state of use of a guide device for laying underground power cables according to a preferred embodiment of the present invention.
3 is a perspective view showing a joint member of a guide device for laying underground power cables according to a preferred embodiment of the present invention.
4 is a side view showing a joint member of a guide device for laying underground power cables according to a preferred embodiment of the present invention.
5 is a perspective view showing a front guide roller of a guide device for laying underground power cables according to a preferred embodiment of the present invention.
6 is a perspective view showing a state in which the opening and the roller opening of the joint member of the underground power cable installation guide device according to a preferred embodiment of the present invention are opened.

According to the present invention, when a three-phase power cable is laid in the ground, the three-phase power cable is curvedly guided inside and outside the manhole so that the three-phase power cable is drawn into the underground pipe located inside the manhole and pulled forward. It relates to a guide device for laying underground power cables.

In particular, the guide device for laying the underground power cable according to the present invention facilitates the introduction of the three-phase power cable into the underground pipe smoothly and quickly to the front without arranging a worker inside the manhole when the three-phase power cable is laid in the underground pipe. It is characterized by being able to solve the difficulty of work due to lack of manpower and the increase in labor cost due to manpower placement at once by placing workers both outside and inside the manhole.

Hereinafter, a guide device for installing underground power cables according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Guide device for underground power cable laying according to a preferred embodiment of the present invention is a second manhole for laying a three-phase power cable (C) in an underground pipe (P) connecting between a first manhole and a second manhole provided in the ground. When pulling the 3-phase power cable (C) from the outside of the manhole, it is provided inside and outside the first manhole (hereinafter referred to as 'manhole') so that the 3-phase power cable (C) flows smoothly into the underground pipe (P). As a guide to be drawn in, it may be composed of an extension guide tube 200 and a joint member 300 as shown in FIGS. 1 and 2.

First, when the three-phase power cable (C) is towed forward by the traction wire according to the operation of the polling equipment, the extension guide pipe 200 moves the three-phase power cable (C) from the outside of the manhole (M) to the manhole ( M) can be guided so that it is smoothly drawn into the interior of the underground pipe (P) installed inside.

To this end, the extension guide pipe 200 may have a length that can reach from the outer floor adjacent to the manhole M to the entrance of the connection pipe connected to the entrance of the underground pipe P.

In addition, the extension guide pipe 200 has one end located on the floor adjacent to the manhole M from the outside of the manhole M and the other end inserted into the entrance of the underground pipe P from the inside of the manhole M.

In addition, the extension guide pipe 200 has a mountain 211 along the outer circumferential surface so that it can be gently bent and deformed according to the height difference between the outer position of the manhole M and the inlet position of the underground pipe P located inside the manhole M. The wrinkles 210 may have a corrugated tube structure in which the corrugations 210 are formed in a spiral shape so that the corrugations and valleys 212 are repeated.

Here, a connection pipe exposed to the inside of the manhole M may be connected to the entrance of the underground pipe P. That is, the connection pipe may be connected to the inlet of the underground pipe (P) via a connecting member, and the inlet of the connection pipe may be exposed to the inside of the manhole (M).

However, the connection pipe may be divided into a first connection pipe (J1) and a second connection pipe (J2) having different structures according to the purpose of use.

As shown in FIG. 1 , the first connection conduit J1 may have a shape in which a female screw S is round along an inner circumferential surface of the inlet.

As shown in FIG. 2, the second connection conduit J2 has a connection flange F installed around the inlet periphery, and a plurality of mounting holes H along the edge of the connection flange F are cut at regular angular intervals. can have a shape.

Next, the joint member 300 is connected to the inlet of the connecting pipe connected to the inlet of the underground pipe P, so that the other end of the extension guide pipe 200 and the inlet of the connecting pipe can be connected to each other.

That is, in the joint member 300, the other end of the extension guide pipe 200 is the entrance to the connection pipe so that the three-phase power cable C passing through the extension guide pipe 200 is smoothly drawn into the underground pipe P. It can be connected firmly without separation.

To this end, the joint member 300 may include an insertion tube 310, a connection tube 320, a male screw 330, a fitting hole 340, a fixing piece 350, and a handle 360.

The insertion pipe 310 has an outer diameter smaller than the inner diameter of the connection pipe and may be inserted into the inlet of the connection pipe. The connection tube 320 may extend from the end of the insertion tube and have a relatively larger outer diameter than the outer diameter of the insertion tube 310 .

In addition, the inner diameter of the connecting pipe 320 corresponds to the outer diameter of the other end of the extension guide pipe 200 so that the other end of the extension guide pipe 200 can be inserted into the inside. That is, the insertion pipe 310 is inserted into the entrance of the connecting pipe in the inner wall of the manhole M, and the connecting pipe 320 protrudes out of the inner wall of the manhole M, so that the other end of the extension guide pipe 200 is inserted into the inside. can

The male screw 330 may be recirculated on an outer circumferential surface of a boundary between the insertion tube 310 and the connection tube 320 . That is, when the connection conduit is the first connection conduit (J), the male screw 330 is fastened with the female screw (S) of the first connection conduit (J) in a screw-type manner, and the insertion tube 310 and the first connection conduit (J) can be firmly connected.

A plurality of fitting holes 340 may be formed along the outer circumference of the connecting pipe 320 at regular intervals. However, the fitting hole 340 may be formed obliquely at a position and angle corresponding to the valley 212 formed in the extension guide tube 200.

The fixing piece 350 is inserted into the fitting hole 340 in an interference fit manner, and a locking protrusion 351 inserted into the valley 212 of the extension guide tube 200 may protrude from the lower end.

That is, when the fixing piece 350 is completely inserted into the fitting hole 340, the protrusion 351 is caught in the valley 212 of the extension guide pipe 200, and the extension guide pipe 200 is removed from the connecting pipe 320. It can be fixed so that it does not separate.

A plurality of handles 360 may be installed on the outer circumferential surface of the connecting pipe 320 at regular intervals. However, the handle 260 is bent so that both sides face the connection pipe 320 so that an empty space is formed between the outer circumferential surface of the connecting pipe 320, and the ends of both sides of the bent end are on the outer circumferential surface of the connecting pipe 320, respectively. It may have a fixed ring shape.

That is, when the handle 360 screws the connection pipe 320 through the male screw 330 to the first connection pipe J having the female screw S, the operator can easily turn the connection pipe 320 into a hand part. It can serve as a handle that can be gripped and rotated.

In addition, the handle 360 has no female screw S and a mounting means such as a steel wire or rope to fix the connecting pipe 320 to the second connecting pipe J having a connecting flange F and a mounting hole H ( R) can also serve as a fixing means that can be tied together with the connection flange (F) through the mounting hole (H) and fixed.

As described above, the other end of the extension guide pipe 200 has a length from the inside of the manhole M to the joint member 300, and the other end is connected to the entrance of the connecting pipe through the joint member 300, so that the extension guide pipe ( 200) and the joint member 300 in turn, the three-phase power cable can be directly introduced into the entrance of the connecting pipe.

Then, there is no need for a worker to perform manual work on the three-phase power cable (C) to be placed inside the manhole (M) so that the three-phase power cable (C) is smoothly introduced into the entrance of the connecting pipe, reducing the number of workers. can

Here, the guide device for underground power cable installation according to a preferred embodiment of the present invention is disposed on the outer floor adjacent to the manhole (M) and guides the three-phase power cable (C) to be drawn into the extension guide pipe (200). A guide roller 100 may be further included.

At this time, the shear guide roller 100 may be composed of a guide tube 110, a connection flange 120 and a guide roller 130.

The guide tube 110 has a certain length, and the length of the rear end gradually increases as it goes downward, so that the periphery of the rear end may be formed in a curved surface. That is, the guide pipe 110 may pass the three-phase power cable C along the lengthwise direction so that the three-phase power cable C is pulled into the manhole while seated on the floor adjacent to the manhole.

At this time, an opening 111 may be cut out at one side of the guide tube 110 at a predetermined radius along the longitudinal direction. Then, the three-phase power cable C passing through the inside of the guide pipe 110 can be easily separated to the outside of the guide pipe 110 through the opening 111 .

Here, although not separately shown, a front end support and a rear end support may be respectively installed at the bottom of the front end and the rear end of the guide tube 110 so as to firmly and stably support the guide tube 110 from the floor.

In addition, the tip support is adjustable in length so that the three-phase power cable (C) can pass through the guide tube 110 smoothly, and the angle formed by the guide tube 110 and the floor can be adjusted when the guide tube 110 is seated on the floor. can be made possible.

The connection flange 120 may extend a predetermined length horizontally along the radial direction of the guide tube 110 at the periphery of the front end of the guide tube 110 .

That is, the connection flange 120 may extend horizontally to have a certain area along the radial direction of the guide tube 110 to connect the guide roller 130 along the periphery of the front end of the guide tube 110 .

Also, on both sides of the connection flange 120, connection holes 121 for connecting and fixing a fixed rope or the like so as to be stably fixed and supported on the floor may be formed through the front and back.

The guide roller 130 is composed of three corresponding to the three-phase power cable C, and may be installed in a triangular shape with the guide tube 110 as the center on the front of the connection flange 120.

That is, the guide roller 130 passes through the inside of the guide tube 110 and rolls according to friction with the three-phase power cable C pulled into the manhole, while the three-phase power cable C moves along the guide tube ( 110) can be guided to smoothly pass through the inside.

At this time, as the guide roller 130 is arranged in a triangular shape based on the center of the guide tube 110, the three-phase power cable C passes through the guide roller 130 and does not climb on top and bottom double or triple. It can be maintained in a triangular arrangement without

Therefore, when the three-phase power cable (C) passes through the inside of the corrugated conduit disposed inside the manhole, there is no risk of being momentarily jammed, so it can be laid in the ground while being pulled smoothly by the pulling equipment.

To this end, the guide roller 130 includes a support shaft 131 installed in the radial direction of the guide tube 110, a bearing 132 extrapolated to both outer circumferential surfaces of the support shaft 131, and an outer side of the support shaft 131. It may be composed of a rotary drum 133 that is extrapolated with a bearing 132 therebetween and rolls around the support shaft 131 according to friction with the three-phase power cable C.

At this time, while both ends of the support shaft 131 are fixedly supported on the front surface of the connection flange 120, the rotary drum 133 is centered on the support shaft 131, and the three-phase power cable (C) by the action of the bearing 132 The length of the support shaft 131 may be configured to be relatively longer than the length of the rotary drum 133 so as to roll according to friction with the roller.

Then, both ends of the support shaft 131 may be further protruded outward from both ends of the rotary drum 133 along the longitudinal direction to be fixedly supported on the front surface of the connection flange 120 .

To this end, the guide roller 130 is installed upright on the front of the connection flange 120 so as to be perpendicular to the connection flange 120 while facing each other at regular intervals, connecting one end and the other end of the support shaft 131 to the connection flange 120. ) A first connecting member 134 and a second connecting member 135 which are respectively fixed and supported on the front surface of the may be further included.

That is, one end and the other end of the support shaft 131 are fixedly supported by the first connecting member 134 and the second connecting member 135, respectively, so that the rotary drum 133 resists friction with the three-phase power cable C. When rotating along, the center can be rotatably and firmly supported.

On the other hand, in order to separate the three-phase power cable (C) to the outside through the opening 111 of the guide tube 110, according to the triangular arrangement of the guide roller 130, the opening 111 of the guide tube 110 ) and the guide roller (130a) disposed at a corresponding position may be detachably installed on the connection flange (120).

To this end, the first connecting member 34a and the second connecting member 35a, which fix and support one end and the other end of the support shaft 131a of the guide roller 130a, are connected to one end of the support shaft 131 of the other guide roller 130. It may have a structure different from that of the first connecting member 134 and the second connecting member 135 for fixing and supporting the other ends, respectively.

That is, the first connecting member 134a is vertically connected to the first fixing piece 1341 fixed to the connecting flange 120 and one end of the first fixing piece 1341 and has a first through hole 1343 at the end. The through-formed 1a standing piece 1342 and the other end of the first fixing piece 1341 are vertically connected in parallel with the 1a standing piece 1342, and the first bolt hole 1345 is formed through the end. The first bolt hole 1345 is formed by sequentially passing through the 1b standing piece 1344, the first through hole 1343, and the first through hole 1311 formed through one end of the support shaft 131a. It may be composed of a first fixing bolt 1346 screwed to.

In addition, the second connecting member 135a is vertically connected to a second fixing piece 1351 fixed to the connecting flange 120 and one end of the second fixing piece 1351, and a through hole 1353 is formed through the end portion. The 2a standing piece 1352 and the 2b 2b having a second bolt hole 1354 penetrating the other end of the first fixing piece 1351 are connected vertically to be parallel to the 2a standing piece 1352 Ends sequentially pass through the rising piece 1353, the second through hole 1353, and the second through hole 1312 formed through the other end of the support shaft 131a, and screwed into the second bolt hole 1354. It may be composed of a second fixing bolt (1356).

Therefore, if the first fixing bolt 1346 of the first connecting member 134a is left intact and the second fixing bolt 1356 of the second connecting member 135a is separated, one end of the support shaft 131a is the first fixing bolt 1346, the other end of the support shaft 131a is disconnected from the connection flange 120 while being disconnected from the second connection member 135a.

Conversely, if the second fixing bolt 1356 of the second connecting member 135a is left intact and the first fixing bolt 1346 of the first connecting member 134a is separated, the other end of the support shaft 131a is fixed to the second fixing bolt. It becomes a state in which it can rotate around the bolt 1356, and one end of the support shaft 131a is separated from the connection flange 120 as the connection with the first connection member 134a is released.

In this state, when the rotary drum 133a is rotated in one direction or the other, the opening 111 of the guide tube 110 and the roller gap extending between the guide roller 130, which is the original position of the guide roller 130a, As the airway 136 is formed, the three-phase power cable C can be easily separated to the outside of the guide tube 110 through the opening 111 of the guide tube 110.

The above embodiment is merely an example, and other embodiments variously modified therefrom are possible to those skilled in the art.

Therefore, the true technical protection scope of the present invention should include not only the above embodiments but also variously modified other embodiments according to the technical spirit of the invention described in the claims below.

100: shear guide roller
110: guide
111: opening
120: connection flange
121: connector
130, 130a: guide roller
131, 131a: support shaft
1311: first through hole
1312: second through hole
132, 133a: bearing
133, 133a: rotary drum
134, 134a: first connecting member
1341: first fixture
1342: 1a erection
1343: first through hole
1344: 1b erection
1345: first bolt hole
1346: first fixing bolt
135, 135a: second connecting member
1351: second fixture
1352: 2a erection
1353: second through hole
1354: 2b erection
1355: second bolt hole
1356: second fixing bolt
136: roller opening
200: extension guide tube
210: wrinkles
211: mountain
212: goal
300: joint member
310: insertion tube
320: connector
330: male thread
340: fitting
350: fixed piece
351: stumbling block
360: handle
C: 3-phase power cable
M: manhole
P: underground pipe
J1: first connection pipe
S: female thread
J2: 2nd connection pipe
F: connection flange
H: Fitting hole
R: means of attachment

Claims (7)

Equipped inside and outside the first manhole when pulling the three-phase power cable with pulling equipment from the outside of the second manhole to install the three-phase power cable in the underground pipeline connecting the first manhole and the second manhole prepared in the ground and guides the three-phase power cable to be smoothly introduced into the underground pipeline;
Having an extended length from the outer floor adjacent to the first manhole to the entrance of the connection pipe so that one end is located on the outer floor adjacent to the first manhole and the other end is connected to the entrance of the connection pipe connected to the underground pipe extended guide tube; and
A joint member connected to the entrance of the connection pipe and accommodating the other end of the extension guide pipe to the inside to connect the extension guide pipe and the connection pipe to each other,
The joint member
an insertion tube having an outer diameter that can be inserted inside the inlet of the connection tube;
a connection tube extending from an end of the insertion tube and having a relatively larger outer diameter than the outer diameter of the insertion tube;
a male screw threaded around the outer circumferential surface of the boundary between the insertion tube and the connection tube and screwed into the female screw formed on the inner circumferential surface of the inlet of the connecting tube;
A plurality of fitting holes along the outer circumference of the connecting pipe are obliquely penetrated at positions corresponding to the valleys of the extension guide pipe at regular intervals; and
A fixing piece fitted into the fitting hole in an interference fit manner, and a locking protrusion inserted into the valley of the extension guide pipe and engaging at the lower end protrudes to fix the extension guide pipe so that it is not separated from the connection pipe. Characterized by a guide device for laying underground power cables. According to claim 1,
The extension guide tube
A guide device for laying underground power cables, characterized in that it has a corrugated pipe structure in which corrugations are spirally formed so that peaks and valleys are repeated along the outer circumferential surface so as to be gently bent and deformed. delete According to claim 1,
The joint member
A plurality of handles are installed to protrude from the outer circumferential surface of the connecting pipe at regular intervals; further included,
the handle is
While both sides are bent toward the connecting pipe so that an empty space is formed between the outer circumferential surface of the connecting pipe and both ends are fixed to the outer circumferential surface of the connecting pipe, a string or wire is passed through the empty space to the outside of the entrance to the connecting pipe. A guide device for laying underground power cables, characterized in that it has a ring shape capable of connecting the connection pipe and the connection pipe to each other by walking together with a connection flange having a cutout groove. According to claim 1,
A shear guide roller disposed on the outer floor adjacent to the first manhole and guiding the three-phase power cable to be introduced into the extension guide pipe; further included,
The shear guide roller
A guide tube having a predetermined length and having an opening cut along one side in the longitudinal direction;
A connection flange extending horizontally along the radial direction at the periphery of the front end of the guide tube; and
A support shaft consisting of three and disposed in a triangular shape with the guide tube as the center on the front surface of the connecting flange and having both ends exposed at the center of each longitudinal direction penetrates and is perpendicular to the guide tube, and one end and the other end of the support shaft A guide roller which is fixedly supported by a first connecting member and a second connecting member installed upright on the front surface of the connecting flange so as to be perpendicular to the connecting flange and performs a rolling motion according to friction with the three-phase power cable to reduce the frictional force; Guide device for underground power cable installation, characterized in that the configuration. According to claim 5,
Among the guide rollers, the guide roller disposed at a position corresponding to the opening according to the triangular arrangement is
A guide device for laying underground power cables, characterized in that one end is rotatably supported by the first connection member and the other end is detachably connected to the second connection member. According to claim 6,
A first connecting member rotatably supporting one end of the support shaft passing through the center of the guide roller disposed at a position corresponding to the opening among the first connecting members
A first fixing piece fixed to the connecting flange, a 1a standing piece connected vertically to one end of the first fixing piece and having a first through hole formed through the end, and the 1a standing piece at the other end of the first fixing piece. The first bolt hole is sequentially passed through a 1b standing piece connected vertically to be parallel to and through which a first bolt hole is formed at an end portion, and a first through hole formed through the first through hole and one end of the support shaft. It consists of a first fixing bolt screwed to,
A second connecting member rotatably supporting the other end of the support shaft passing through the center of the guide roller disposed at a position corresponding to the opening among the second connecting members
A second fixing piece fixed to the connection flange, a 2a standing piece vertically connected to one end of the second fixing piece and having a second through hole formed through the end, and the 2a standing piece at the other end of the first fixing piece. The second bolt hole is sequentially passed through a 2b standing piece connected vertically to be parallel to and through which a second bolt hole is formed at the end, and a second through hole formed through the second through hole and the other end of the support shaft. It consists of a second fixing bolt screwed to,
When the first fixing bolt or the second fixing bolt is separated, the other end or one end of the support shaft becomes the center of rotation and the guide roller is rotated in one direction or the other direction to form a roller opening extending to the opening. Guide device for underground power cable installation, characterized in that.

Images