JP2013093940A - Pedestal for power cable for movement and method for installing/removing pedestal for power cable for movement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the burden of work for installing a power cable for movement on a pedestal without increasing the area to be occupied by a device.SOLUTION: As a substrate for supporting the weight of a cable head 203 that a power cable 201 for movement comprises, a base 11 installed on the ground and a column body 31 extending upward therefrom are provided. A rotary stage 51 is mounted to be freely rotatable around the horizontal axis to the column body 31, and a bracket 53 for mounting the cable head 203 is provided at one terminal side of the rotary stage 51 whose height is changed by rotation. The rotation range of the rotary stage 51 is regulated between a mount position where the cable head 203 is mounted to the bracket 53 in a horizontal attitude, and an usage position where the cable head 203 is brought into a vertical usage state. Therefore, the cable head 203 can be mounted to the bracket 53 at the mount position which is located relatively low, and the power cable 201 for movement can be used safely by fixing the position of the rotary stage 51 located at the usage position.

Description

  The present invention relates to a gantry for installing a moving power cable, and a method for installing and removing the moving power cable from the gantry.

  When inspecting existing equipment at the substation, a mobile power cable will be temporarily installed. The power cable for movement has cable heads at both ends, and is usually wound around a large drum and stored. The drum is made of iron and is rugged so that it can withstand the heavy weight of the moving power cable.

  To use the mobile power cable, bring the drum into the field. Carefully pull out the cable head from the drum brought to the site with several workers and carry it to the intended installation position. At this time, the cable should be sufficiently cured so that the cable will not be damaged by dragging the ground. When the cable head is carried to the installation position, the cable head is installed on a gantry previously installed at the installation position. The installed cable head is in a vertically upright state. At this time, from the viewpoint of safety, the gantry arranges the connection terminal of the cable head at a height of, for example, about 2 m or more.

  The cable head is heavy, for example, exceeding 40 kg even for 60,000 volts. For this reason, it is difficult to lift to a height of 2 m or more by hand only when mounting on the mount. Therefore, conventionally, a cable head is lifted using a tow truck. The lifted cable head is attached to the bracket of the gantry with the cooperation of several workers.

Japanese Patent Laid-Open No. 06-082417

  As described above, in order to use the power cable for movement, it is necessary to mobilize several workers, lift the cable head with a tow, and attach it to the gantry. At this time, since the cable head that is lifted by the tow truck is in a free state in the space, it is difficult to attach it to the bracket at a high place where the scaffolding is bad. . From the worker's point of view, not only the difficulty of the work itself, but also the possibility of hitting the mount and damaging the cable head, sliding down from a high place, etc. The burden on the site is also large. Some improvement is desired.

  In this regard, Patent Document 1 discloses an integrated power charging device in which a drum that stores a moving power cable in a wound state is connected to a mount on which one cable head of the moving power cable is installed. The invention has been described. The drum and the gantry have casters on the lower surface and can be transported to the site as a unit.

  However, if the drum and the pedestal are integrated as in the power application device described in Patent Document 1, the device inevitably increases in size and increases the occupied area. The occurrence of such a situation should be avoided if possible.

  In addition, in the power application device described in Patent Document 1, the other end of the cable having a cable head at one end is not a cable head but a terminal connector that is a slip-on connection terminal. If this is a cable head, the same problem as the power cable for movement provided with the cable head at both ends as described above will eventually occur. In order to avoid this, it is necessary to integrally connect two platforms to one drum. In this case, however, the size of the device is further increased, and the occupied area increases more and more. End up.

  The present invention has been made in view of such points, and an object thereof is to reduce the burden of work for installing a moving power cable on a gantry without causing an increase in the area occupied by the apparatus. To do.

  A base for a power cable for movement according to the present invention includes a base installed on the ground and a column that is fixed to the base and extends upward, and supports a weight of a cable head included in the power cable for movement. A rotating base provided with a bracket for mounting the cable head on one end side that is rotatably attached to the column body provided in the base body around a horizontal axis and changes the height by rotation, and a rotation range of the rotating base. , A restricting portion for restricting between the mounting position for mounting the cable head sideways on the bracket and the use position for placing the cable head in the vertical use state, and fixing the rotary base to the use position The above-described problem is solved by including a fixing portion.

  In the method for installing and removing a gantry for a moving power cable according to the present invention, the moving power cable is provided on the bracket of the turntable located at the mounting position using the gantry for the moving power cable. Following the first installation step of mounting the cable head, the second installation step of rotating the turntable from the mounting position to the use position, following the first installation step, and the second Following the installation step, a third installation step of fixing the position of the turntable to the use position by the fixing portion, and a first removal step of releasing the position fixing of the turntable to the use position by the fixing portion. Then, following the second removal step, following the second removal step, the second removal step of rotating the turntable to return from the use position to the attachment position, and the second removal step. Do Comes from the turntable of the bracket, to solve the above problems by providing a, a third removal step of removing the cable head.

  The method for installing and removing the gantry for the moving power cable according to the present invention includes the elevating mechanism in which the column body supports the rotating shaft of the rotating table so as to be movable up and down on the gantry for the moving power cable, and the rotating table. The moving power cable includes: a lifting drive unit that applies an external force to the rotating shaft of the rotating shaft to displace the vertical position of the rotating power shaft. In order to maintain a bending radius greater than a predetermined multiple of the finishing radius, an additional step of applying an external force to the rotary shaft of the rotary table by the elevating drive unit and displacing the vertical position thereof is further added. This solves the above problem.

  According to the present invention, since the mounting position for mounting the cable head sideways on the bracket of the gantry can be positioned lower than the use position, the state where the worker is lifted up, not in the state of being lifted by the tow truck The cable head can be attached to the bracket, and a structure such as a drum that accommodates the moving cable head in a wound state is added to the frame, but it does not have a structure. Therefore, it is possible to reduce the work load of the work for installing the power cable for movement on the gantry without increasing the size of the apparatus.

The perspective view which shows the whole apparatus as 1st implementation. The side view of the whole apparatus which shows the state which mounted | wore the power cable for a movement with the bracket of the turntable located in a mounting position. The side view of the whole apparatus which shows the state which lifted and rotated the turntable which attached the power cable for a movement to the bracket with the tow truck. The side view of the whole apparatus which shows the state which rotated the turntable which attached the power cable for movement to the bracket to the use position. The side view of the whole apparatus which shows the state which mounted | wore the power cable for a movement with the bracket of the turntable located in a mounting position as 2nd embodiment. The side view of the whole apparatus which shows the state which rotated the turntable which attached the power cable for movement to the bracket to the use position. As a third embodiment, an example of a reverse rotation prevention mechanism mounted on a rotary shaft of a turntable is shown. (A) is a vertical side view during execution of the reverse rotation prevention operation, and (b) is a vertical side surface during release of the reverse rotation prevention operation. Figure. The side view which shows an example of the boost mechanism which drives the rotating shaft of a turntable manually as 4th Embodiment. The longitudinal section side view which shows an example of the ratchet mechanism with which the rotating shaft of the small gear was mounted | worn. The side view which shows an example of the power transmission mechanism (worm gear) which transmits the driving force from a power source to the rotating shaft of a turntable as 5th embodiment. The side view of the whole apparatus which shows the state which attached the power cable for a movement to the bracket of the turntable located in a mounting position as 6th Embodiment. The side view of the whole apparatus which shows the state which pushed up the turntable which attached the power cable for movement to the bracket with the hydraulic cylinder, and is rotating. The side view of the whole apparatus which shows the state which rotated the turntable which attached the power cable for movement to the bracket to the use position. The schematic diagram which shows an example of the hydraulic drive mechanism which drives a hydraulic cylinder. The side view of the whole apparatus which shows the state which mounted | wore the power cable for a movement with the bracket of the turntable located in a mounting position as 7th Embodiment. The side view which shows an example of the raising / lowering mechanism which raises / lowers a turntable. The side view which shows another example of the raising / lowering mechanism which raises / lowers a turntable. The side view of the whole apparatus which positioned the turntable in the highest position. The side view of the whole apparatus which shows the state which attached the power cable for a movement to a bracket, and rotated the turntable positioned in the highest position to the use position.

  The present embodiment is a gantry for installing the moving power cable 201 and an installation / removal method of the gantry. The power cable for movement 201 is formed by connecting and fixing a pair of cable heads 203 each having an electrode 202 at a distal end to both ends of the cable 204, and is usually wound around a large drum and stored. Here, the first to seventh embodiments are introduced.

1. First Embodiment A first embodiment will be described with reference to FIGS.

(1) Structure of gantry As shown in FIG. 1, the gantry according to the present embodiment is a rotating gantry for mounting the cable head 203 of the power cable for movement 201 on a base body composed of a base 11 and a column 31. 51 is attached rotatably. The cable head 203 is attached to a bracket 53 provided on the turntable 51. In FIG. 1, the turntable 51 is in a horizontal posture, but the turntable 51 is rotatable to a position that takes a vertical posture. For convenience of explanation, in the present embodiment and all subsequent embodiments, the position of the turntable 51 taking the horizontal posture is referred to as “mounting position”, and the position of the turntable 51 taking the vertical posture is referred to as “use position”. The mounting position is a position where the cable head 203 is mounted on the bracket 53 with the side facing sideways. The use position is a position where the cable head 203 is placed in a vertical use state.

  The base 11 is a steel structure that is installed on the ground and can support the weight of the cable head 203 included in the moving power cable 201. Such a base 11 is formed by connecting a pair of base frames 12 having a rectangular frame shape with two connecting bodies 13. The connection position of the pair of base frames 12 by the connecting body 13 is a position in the vicinity of both ends of the base frames 12, and a slight distance remains between the both ends. Thereby, the pair of base frames 12 generate regions facing each other at both end portions thereof, and the pair of auxiliary bases 14F and 14R are rotatably attached to the portions by the rotation shaft RA. These auxiliary bases 14F and 14R are also steel structures having a rectangular frame shape.

  In FIG. 1, one auxiliary base 14F is in a horizontal posture, and the other auxiliary base 14R is rotated slightly upward from the horizontal position to take an inclined posture. On the other hand, the auxiliary bases 14F and 14R are both rotatable between a position (horizontal position) where the horizontal position is taken and a position (vertical position) where the vertical position is taken (vertical position). FIG. 2 shows a state in which the pair of auxiliary bases 14F and 14R is in a vertical posture. Although this is an important point, as shown in FIG. 2, the pair of auxiliary bases 14 </ b> F and 14 </ b> R taking a vertical posture supports both ends of the turntable 51 and restricts free rotation of the turntable 51. Another important point is that the pair of auxiliary bases 14F and 14R are releasably fixed between a horizontal position and a vertical position. The mechanism used for this purpose is a mechanism that penetrates one auxiliary base 14F and the base frame 12 and the other auxiliary base 14R and the base frame 12 with pins (not shown). is there. Needless to say, through holes (not shown) through which the pins pass are formed only at two positions, a position where the pair of auxiliary bases 14F and 14R take a horizontal position and a position where they take a vertical position. It is determined at a position where it can be penetrated. The pins can be freely inserted and removed, and if they are removed, the pair of auxiliary bases 14F and 14R can be freely rotated.

  The column 31 is formed by a pair of column members 32 formed by bending a flat iron plate into an L shape. These column members 32 are welded so that the bottom portion of the L shape is stretched over the link facing the base frame 12 and the vertical portions of the L shape face each other. As will be described later, L-shaped vertical portions facing each other are portions that rotatably support the turntable 51. The pair of column members 32 have a stopper 33 fixed to one side of the L-shaped vertical portion. The stopper 33 is a flat iron plate, and is fixed to the pair of column members 32 by welding on the auxiliary base 14F side.

  Here, as described above, the pair of auxiliary bases 14F and 14R taking the vertical posture support both ends of the turntable 51 and restrict the free rotation of the turntable 51. That is, when the pair of auxiliary bases 14F and 14R does not take a vertical posture, the turntable 51 freely rotates. Then, in this state, whether the turntable 51 rotates 360 degrees is not so. 1 to 4, if the turntable 51 rotates clockwise, the turntable 51 eventually comes into contact with the stopper 33 and its free rotation is prevented. At this time, the turntable 51 takes a vertical posture (see FIG. 4). In summary, the pair of auxiliary bases 14F and 14R, particularly the auxiliary base 14F on the bracket 53 side, restricts the rotational position of the turntable 51 to the mounting position. The stopper 33 restricts the rotation position of the turntable 51 to the use position. Therefore, the auxiliary base 14F and the stopper 33 function as a restricting portion that restricts the rotation range of the turntable 51 between the mounting position and the use position.

  The turntable 51 is mainly formed of a steel turntable frame 52 having a rectangular frame shape. The rotating base frame 52 has a bracket 53 attached to one end side which is the auxiliary base 14F side, so that the cable head 203 of the power cable for movement 201 can be attached thereto. The bracket 53 is a cylindrical steel member. In order to pass the cable 204 of the power cable for movement 201, the bracket 53 is notched or partly openable and closable (both not shown).

  The turntable 51 is attached to a pair of column members 32 by a rotation shaft 54 so as to be rotatable around a horizontal axis. As described above, the turntable 51 is supported by the L-shaped vertical portions of the pair of column members 32 facing each other. The turntable 51 is positioned above this portion. For example, the rotary shaft 54 is rigidly fixed to the rotary frame 52 and is rotatably attached to the pair of column members 32. As another example, the rotation shaft 54 may be configured so as to be rigidly fixed to the pair of column members 32 and to rotatably support the rotary frame 52.

  Further, the turntable 51 is positioned in the vicinity of the bracket 53, and a pair of suspension holes 55 are formed in the links facing each other. These suspension holes 55 are used for passing the rope 301 and lifting or suspending the turntable 51 with a tow truck (see FIGS. 3 and 4).

  As described above, the turntable 51 described above is between the mounting position where the cable head 203 of the moving power cable 201 is mounted horizontally and mounted on the bracket 53 and the usage position where the cable head 203 is used vertically. Selectively positioned. Among these, as described above, the use position is a position where the free rotation of the turntable 51 is restricted by the stopper 33. As shown in FIG. 4, at this time, the turntable 51 is fixed in the use position because the weight of the power cable 201 for movement is balanced in a clockwise direction in FIG. 4. Is in a state. In this sense, it can be said that the weight balance formed by the turntable 51 and the stopper 33 function as a fixing portion for fixing the turntable to the use position. However, in this state, when a force is applied to the turntable 51 in the counterclockwise direction in FIG. 4, depending on the magnitude of the force, the turntable 51 is directly rotated in the counterclockwise direction. But there is still a problem with safety. Therefore, it is desirable to provide a mechanism for positively fixing the position of the turntable 51 located at the use position as a fixing portion. As an example, such a mechanism can be realized by a mechanism that penetrates the turntable 51 and one or both of the column members 32 with pins (not shown). Needless to say, the through-hole (not shown) through which the pin passes is formed only when the turntable 51 is in the vertical position with the stopper 33 blocked by the stopper 33 and positioned in the use position. It is determined at the position to do. The pins can be freely inserted and removed, and once the pins are removed, the turntable 51 can be freely rotated again.

(2) Installation / removal method of gantry In such a configuration, when the necessity of temporary laying of the power cable for movement 201 arises, a drum to be housed with the power cable for movement 201 wound is brought into the field. Carefully pull out the cable head from several drums and carry it to the target installation position after sufficiently curing so that the cable will not be damaged by dragging the ground from the drum brought to the site. A stand is installed in advance at the installation position. The gantry at this time is in a state where the turntable 51 is positioned at the mounting position and the turntable 51 is restricted from rotation by the pair of auxiliary bases 14F. Hereinafter, the installation procedure of the power cable 201 for movement to the gantry and the procedure for removing the power cable 201 from the gantry will be described.

      ≪Installation procedure of power cable 201 for movement to the base≫

(First installation process)
As shown in FIG. 2, one cable head 203 of the power cable for movement 201 is attached to the bracket 53 of the turntable 51 located at the attachment position. At this time, the turntable 51 located at the mounting position maintains the horizontal posture and positions the bracket 53 at a position far lower than the use position when the power cable for movement 201 is actually used. For this reason, the cable head 203 can be mounted on the bracket 53 in a state in which the worker lifts the cable head 203 without requiring lifting of the cable head 203 using a tow (not shown).

(Second installation process)
As shown in FIGS. 3 and 4, following the first installation step, the turntable 51 is rotated and moved from the mounting position to the use position. At this time, a suspension force is applied to the turntable 51 by a tow truck through a rope passed through the suspension hole 55. And as shown in FIG. 3, the rotation restrictions with respect to the auxiliary bases 14F and 14R which take a vertical attitude | position are cancelled | released, and the auxiliary bases 14F and 14R are rotated and displaced to a horizontal attitude | position. The auxiliary bases 14F and 14R in the horizontal posture are subjected to rotation restriction again. At this time, since the turntable 51 is suspended by the wrecker, the horizontal posture is maintained even if the rotation restriction by the auxiliary bases 14F and 14R is released.

  Thereafter, as shown in FIG. 3, the turntable 51 is lifted by a tow truck via a rope 301. Then, the turntable 51 rotates about the rotation shaft 54 as a rotation center (see FIG. 3), and is finally positioned at a use position that takes a vertical posture (see FIG. 4).

(Third installation process)
Following the second installation step, the rotary table 51 is fixed to the use position by the fixing unit described above.

  With the above procedure, the cable head 203 of the power cable for movement 201 can be installed on the gantry. Therefore, the power cable for movement 201 can be used by moving the wrecker away as necessary. The rope 301 attached to the turntable 51 through the suspension hole 55 may be removed as necessary. If you can keep it on, you can leave it as it is.

≪Procedure for removing power cable 201 for movement from gantry≫
(First removal process)
The position fixing to the use position of the turntable 51 by the fixing unit described above is released.

(Second removal process)
Following the second removal step, the turntable 51 is rotated to return from the use position to the mounting position. That is, the wrecker is reappeared, and the turntable 51 is hung by the wrecker via the rope passed through the hanger 55, and the hung force is applied. Before and after this, the rotation restriction on one auxiliary base 14F taking the horizontal posture is released, and the auxiliary base 14F is rotated and displaced to the vertical posture. The auxiliary base 14F in the vertical posture is subjected to rotation restriction again.

  In this state, a rotating force in the counterclockwise direction in FIG. Then, the started turntable 51 rotates by its own weight in the counterclockwise direction in FIG. At this time, since the turntable 51 is suspended by the tow, there is no inconvenience that the turntable 51 may fall down at once, and the degree of rotation is gradually deepened by the operation of the tow, and is finally positioned at the mounting position. Accordingly, the rotation restriction on the other auxiliary base 14R taking the horizontal posture is also released, and the auxiliary base 14R is rotated and displaced to the vertical posture. The auxiliary base 14R in the vertical posture is subjected to rotation restriction again. By doing so, the turntable 51 returns to the state when it is installed at the installation position of the cable head 203 (see FIG. 1).

  At this time, the turntable 51 is subjected to the rotation restriction by the pair of auxiliary bases 14F and 14R, so it is not necessary to suspend the turntable 51 with a tow truck. There, the wrecker can be dismissed. The rope 301 attached to the turntable 51 through the suspension hole 55 may be removed as necessary. If you can keep it on, you can leave it as it is.

(Third removal process)
Following the second removal step, the cable head 203 is removed from the bracket 53 of the turntable 51 located at the mounting position. At this time, the turntable 51 located at the mounting position maintains a horizontal posture and positions the cable head 203 at a low position. For this reason, the cable head 203 can be removed from the bracket 53 only by an operator's manual work, without requiring lifting of the cable head 203 using a wrecker (not shown).

  The cable head 203 of the moving power cable 201 can be removed from the gantry by the above procedure.

(3) Effect As described above, according to this embodiment, when the cable head 203 is attached to and detached from the bracket 53, a plurality of workers can hold the cable head 203 in their hands without requiring lifting by a tow truck. Detachment work can be performed. This is a point where the worker can feel a firmer feeling than the conventional method of hanging the cable head 203 with a tow truck. This is because the movement of the cable head 203 is not completely in the hands of the worker in the case of the conventional method in which the cable head 203 is suspended by the tow truck. You have to match the breathing with the workers who operate the tow truck, and often you will feel frustrated when you work. On the other hand, in the present embodiment, since a plurality of workers can perform attachment / detachment work while holding the cable head 203 in their hands, the movement of the cable head 203 is completely in the hands of the workers. You can work as it is.

  In addition, when the cable head 203 is attached to and detached from the bracket 53, the turntable 51 is positioned at a position that is far lower than the use position, which is the mounting position. For this reason, the work of climbing to a high place is unnecessary, and there is no need to worry about sliding off from a high place.

  For this reason, according to the present embodiment, it is possible to significantly reduce the work load for the work for installing the cable head 203 of the power cable for movement 201 on the gantry.

  Moreover, the gantry of the present embodiment does not have structural factors that cause an increase in the occupied area compared to the conventional gantry. In addition, as shown in FIG. 2, the gantry is in a state in which the pair of auxiliary bases 14F and 14R are set up vertically as shown in FIG. For this reason, the gantry of the present embodiment can greatly reduce the work load without increasing the occupied area.

  On the other hand, the stand in use in which the cable head 203 of the power cable for movement 201 is mounted has a pair of auxiliary bases 14F and 14R in a horizontal posture and restricts the position thereof. For this reason, in use, the installation area of the entire gantry increases, and the cable head 203 can be held in a stable state.

2. Second Embodiment A second embodiment will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  In this embodiment, a damper 101 is stretched between a base 11 and a turntable 51 that form a base. A pair of dampers 101 is prepared, one between the base frame 12 forming the base 11 and one link of the rotary base 51, and the other base frame 12 forming the base 11 is rotated. Another one is spanned between another link of the platform 51.

  As the damper 101, for example, an oil damper used for an opening / closing part of a hood or trunk of an automobile, a door opening / closing part or the like as a building material can be used. The oil damper forms a sealed space filled with oil inside a cylindrical cylinder case 102, and a piston (not shown) connected to the rod 103 is slidably accommodated in the sealed space. is there. The piston is formed with an orifice (not shown) that is a fine pore. The orifice moves oil between two sealed spaces partitioned by the piston in the cylinder case 102 as the piston moves. This causes the damper 101 to have a buffering action.

  In the present embodiment, the cylinder case 102 is rotatably attached to the base 11 side, and the rod 103 is rotatably attached to the turntable 51 side. The rotation axis direction is the same as the axial direction of the rotation shaft 54 of the turntable 51. The attachment position is the side where the bracket 53 is provided.

  In such a configuration, when the turntable 51 rotates, a resistance force is given to the rotation due to the buffering action of the damper 101. For this reason, simply speaking, even if the holding power by the tow truck or the hand is removed from the rotating table 51 in the middle of rotation, the rotating table 51 can be freely dropped as it is so as not to fall over. As a result, the damper 101 produces at least two effects.

  One effect is that it is possible to open a way to rotate the turntable 51 on which the cable head 203 is mounted between the mounting position and the use position only by the operator's force. As described above, the damper 101 generates a resistance force against the rotation of the turntable 51. For this reason, in comparison with the case where there is no damper 101, the work of manually rotating the turntable 51 on which the cable head 203, which is a heavy load, is manually made easier. In addition, even when an unintentional and unexpected situation occurs in which the hand is separated from the rotating table 51 in the middle of rotation, the rotating table 51 may fall as it is and freely fall down due to the buffering action of the damper 101. Absent. In other words, safety is increased. For this reason, the turntable 51 on which the cable head 203 is mounted can be rotated only by the operator's force without using a wrecker. However, the reason why the inclusion is given as “can open the way to rotate” is because, depending on the weight of the cable head 203, it is assumed that a tow must be used.

Another effect is that work safety can be improved. Although it overlaps with the “first effect” described above, even if the holding force by the tow truck or the hand is removed from the rotating table 51 in the middle of rotation, the rotating table 51 falls freely as it is due to the buffering action of the damper 101. It will not fall over. For this reason, in terms of improving safety, the cable head 203 mounted on the turntable 51 is less likely to be damaged, and it is less likely to cause danger to workers around the frame on which the cable head 203 is installed. , You will get great results.
3. Third Embodiment A third embodiment will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  In the present embodiment, a pair of ratchet mechanisms 111 is incorporated into the rotation shaft 54 of the turntable 51. In the first embodiment, it has been described that the rotating shaft 54 may be either rigidly fixed to the rotary frame 52 side or rigidly fixed to the pair of column members 32 side. . On the other hand, in the present embodiment, the rotating shaft 54 is fixed to the rigid side on the rotating frame 52 side.

  Each of the pair of ratchet mechanisms 111 incorporates a ratchet gear 113 in a ratchet case 112 fixed to a column member 32 forming a pair of column bodies 31. The ratchet case 112 is a cylindrical member having a perfectly circular cross section with the rotation shaft 54 of the turntable 51 as an axis. The ratchet gear 113 is fixed to the rotation shaft 54 of the turntable 51 and rotates integrally with the rotation shaft 54. The essence of the ratchet mechanism is to selectively rotate such a ratchet gear 113 only in one direction. It is the pawl mechanism 114 that realizes this. The pawl mechanism 114 has a structure in which the pawl 116 is slidably incorporated in the pawl case 115 slidably attached to the outer peripheral surface of the ratchet case 112, and the pawl 116 is urged by a coil spring 117. Is. The ratchet case 112 moves on a rotation locus having the rotation shaft 54 of the turntable 51 as a rotation center. The pawl 116 protrudes from the pawl hole 118 formed in the ratchet case 112 into the ratchet case 112 and meshes with the ratchet gear 113. The ratchet gear 113 and the pawl 116 are formed so as to rotate the rotating base 51 integrated with the rotating shaft 54 only in the clockwise direction in FIGS. 2 to 4 and prevent the counterclockwise rotation. (See FIG. 7A).

  More specifically, the ratchet gear 113 includes a vertical surface that stands vertically and an inclined surface that has an inclined shape. The inclined surface has a shape that gradually increases in height when the ratchet gear 113 rotates in the clockwise direction in FIGS. The pawl 116 has a side facing the vertical surface of the ratchet gear 113 formed as a vertical surface along the sliding movement direction of the pawl claw 116, and a side facing the inclined surface of the ratchet gear 113 formed as an inclined inclined surface. Has been. Therefore, when the rotation shaft 54 of the turntable 51 is rotated in the clockwise direction in FIGS. 2 to 4, the inclined surface of the pawl 116 rides on the inclined surface of the ratchet gear 113 and resists the biasing force of the coil spring 117. Push the pawl 116 back. Thereby, the turntable 51 can be rotated in the clockwise direction in FIGS. On the other hand, when the rotating shaft 54 of the turntable 51 is rotated counterclockwise in FIGS. 2 to 4, the vertical surface of the ratchet gear 113 and the vertical surface of the pawl 116 collide with each other, and the ratchet gear. The rotation of 113 is prevented. Thereby, the rotation of the turntable 51 in the counterclockwise direction in FIGS. 2 to 4 is prevented. Therefore, the ratchet mechanism 111 allows only the rotation of the turntable 51 from the mounting position toward the use position and prevents the rotation in the opposite direction.

  On the other hand, the ratchet mechanism 111 also has a mechanism for releasing the prevention of the rotation of the turntable 51 in the counterclockwise direction in FIGS. This is realized by the sliding movement structure of the pawl case 115 in the counterclockwise direction (see FIG. 7B). When the pawl case 115 is slid in the counterclockwise direction in FIGS. 7A and 7B, the pawl claw 116 rides on the edge of the pawl hole 118 and retracts from the ratchet gear 113. As a result, the ratchet gear 113, and hence the rotating shaft 54 that fixes the ratchet gear 113, is in a rotation-free state, and the turntable 51 can be rotated in the counterclockwise direction in FIGS.

  In such a configuration, when the turntable 51 rotates, the ratchet mechanism 111 rotates the turntable 51 only in the clockwise direction in FIGS. 2 to 4 and prevents rotation in the counterclockwise direction. That is, with respect to the rotation of the turntable 51, only rotation from the mounting position to the use position is allowed, and rotation in the opposite direction is prevented. For this reason, simply speaking, even if the holding force by the tow truck or the hand is removed from the rotating table 51 in the middle of rotation, the rotating table 51 can be prevented from falling freely. As a result, the ratchet mechanism 111 produces at least two effects. These two effects are the same as the effects of the damper 101 of the second embodiment. Although partially overlapping with the description of the second embodiment, the description will be continued.

  One effect is that it is possible to open a way to rotate the turntable 51 on which the cable head 203 is mounted between the mounting position and the use position only by the operator's force. As described above, the ratchet mechanism 111 rotates the turntable 51 only in the clockwise direction in FIGS. 2 to 3 and prevents the counterclockwise rotation. That is, with respect to the rotation of the turntable 51, only the rotation from the mounting position toward the use position is allowed, and the rotation in the opposite direction is prevented. For this reason, in comparison with the case where the ratchet mechanism 111 is not provided, the work of manually rotating the turntable 51 on which the cable head 203 which is a heavy object is mounted becomes much easier. In addition, even when an unintentional and unexpected situation occurs in which the hand is separated from the turntable 51 in the middle of rotation, the turntable 51 prevents the turntable 51 from freely falling due to the rotation preventing action of the ratchet mechanism 111. Can do. In other words, safety is increased. For this reason, the turntable 51 on which the cable head 203 is mounted can be rotated only by the operator's force without using a wrecker. However, the reason why the inclusion is given as “can open the way to rotate” is because, depending on the weight of the cable head 203, it is assumed that a tow must be used.

Another effect is that work safety can be improved. Although it overlaps with the “first effect” described above, even if the holding force by the tow truck or the hand is removed from the rotating table 51 in the middle of rotation, the rotating table 51 is free to fall due to the rotation preventing action of the ratchet mechanism 111. Can be prevented. For this reason, in terms of improving safety, the cable head 203 mounted on the turntable 51 is less likely to be damaged, and it is less likely to cause danger to workers around the frame on which the cable head 203 is installed. , You will get great results.
4). Fourth Embodiment A fourth embodiment will be described with reference to FIGS. The same parts as those in the first and third embodiments are denoted by the same reference numerals, and description thereof is also omitted.

  In the present embodiment, in addition to the ratchet mechanism 111 of the third embodiment, the rotary table 51 is manually moved from the mounting position via a booster (large gear 122, idle gear G, small gear 123). The operation drive part 121 which provides the rotational force of the direction toward the use position is provided.

  The operation drive unit 121 has a large gear 122 fixed to the rotating shaft 54 of the turntable 51 (the large gear 122 is partially shown in FIG. 8). An idle gear G and a small gear 123 are rotatably attached to the column member 32 of the column body 31. The small gear 123 is fixed integrally with the rotating shaft 124, and the rotating shaft 124 is rotatably attached to the column member 32. The large gear 122 and the small gear 123 are connected via an idle gear G. Both the large gear 122 and the idle gear G have the same number of teeth, and the small gear 123 has a smaller number of teeth. As a result, when the small gear 123 is rotated, the large gear 122 is driven to rotate through the idle gear G at a lower rotational speed than the small gear 123. In other words, the large gear 122 can be driven with less force when the small gear 123 is rotated than when the large gear 122 is directly rotated. Here, a booster using a gear train of a large gear 122, an idle gear G, and a small gear 123 is configured.

  As shown in FIG. 9, the operation drive unit 121 also includes a ratchet mechanism 111a (not shown in FIG. 8). The ratchet mechanism 111a has substantially the same structure as the ratchet mechanism 111 shown in FIGS. 7 (a) and 7 (b). As a corresponding relationship with the ratchet mechanism 111, in FIG. 9, the ratchet case 112a is the ratchet case 112, the ratchet gear 113a is the ratchet gear 113, the pawl mechanism 114a is the pawl mechanism 114, the pawl case 115a is the pawl case 115, The pawl 116a corresponds to the pawl 116, the coil spring 117a corresponds to the coil spring 117, and the pawl hole 118a corresponds to the pawl hole 118, respectively. Therefore, description of the ratchet mechanism 111a is omitted here. However, one difference from the ratchet mechanism 111 shown in FIGS. 7A and 7B is that the pawl case 115a is fixed to the ratchet case 112a and does not slide and move like the ratchet mechanism 111.

  The ratchet mechanism 111a included in the operation drive unit 121 has a ratchet case 112a rotatably attached to a column member 32 constituting the column body 31 so as to be coaxial with the rotation shaft 124 of the small gear 123. The ratchet gear 113 a is fixed to the rotating shaft 124 of the small gear 123. The operation driving unit 121 further fixes an operation lever 125 to the ratchet case 112a. The operation direction of the operation lever 125 is a direction around the rotation shaft 124 of the small gear 123.

  In such a configuration, when the operation lever 125 is pushed down with the turntable 51 located at the mounting position (see FIG. 8), the ratchet case 112a rotates around the rotation shaft 124 of the small gear 123. The rotation direction is the clockwise direction in FIGS. Then, in the ratchet mechanism 111a, the pawl 116a meshes with the ratchet gear 113a (see FIG. 9), so that the rotational driving force is transmitted to the rotating shaft 124 of the small gear 123. As a result, the small gear 123 rotates, and this rotation is transmitted to the large gear 122 via the idle gear G. As a result, the rotation shaft 54 of the turntable 51 is rotationally driven in the clockwise direction, and the turntable 51 starts to rotate from the apparatus position toward the use position.

  When the pushed down operating lever 125 is pushed up to the original position (in FIG. 8, from the phantom line to the solid line), the ratchet case 112a is now rotated counterclockwise in FIGS. At this time, in the ratchet mechanism 111a, the pawl 116a does not mesh with the ratchet gear 113a, so that the rotation of the ratchet case 112a is not transmitted to the rotating shaft 124 of the small gear 123. That is, the gear trains of the small gear 123, the idle gear G, and the large gear 122 do not operate, and thus the turntable 51 does not rotate. At this time, the turntable 51 is kept stationary because the ratchet mechanism 111 shown in FIGS. 7A and 7B prevents reverse rotation, that is, rotation toward the mounting position.

In this way, the turntable 51 can be moved from the apparatus position to the use position by repeatedly depressing and pushing the operation lever 125 several times. At this time, the operation drive unit 121 gives the worker assistance to the booster by a gear train of the large gear 122, the idle gear G, and the small gear 123. Therefore, for example, compared with the case where the rotation shaft 54 of the turntable 51 is directly rotated by the operation lever 125, the turntable mounted with the cable head 203 of the moving power cable 201, which is a heavy object, with less force. 51 can be rotated.
5. Fifth Embodiment A fifth embodiment will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  In this embodiment, a power transmission mechanism 131 that transmits a rotational driving force of a power source (not shown) to the turntable 51 and applies a rotational force in a direction from the mounting position to the use position is provided. It is. In the present embodiment, similarly to the third and fourth embodiments, the rotation shaft 54 of the turntable 51 is rigidly fixed to the turntable frame 52 side.

  The power transmission mechanism 131 is a worm gear in which a screw gear 132 and a helical gear 133 are combined. The screw gear 132 is connected to the power source side, and the helical gear 133 is fixed coaxially with the rotation shaft 54 of the turntable 51. As an example of the power source, a motor having an internal combustion engine is used, and as another example, a motor is used. The rotation of the output shaft (not shown) of the power source is configured to be decelerated as necessary and transmitted to the screw gear 132. When the power source has a structure that rotates its output shaft in only one direction, a mechanism for selectively transmitting the rotation in the one direction in both forward and reverse directions to the screw gear 132 is required.

  In such a configuration, the power transmission mechanism 131 transmits the rotation of the output shaft of the power source to the rotation shaft 54 of the turntable 51 to rotate the turntable 51. That is, when the rotation of the output shaft of the power source is transmitted to the screw gear 132, the screw gear 132 rotates and transmits this rotation to the helical gear 133. Thereby, the rotating shaft 54 of the turntable 51 integrated with the helical gear 133 rotates, and the turntable 51 can be rotated. Therefore, the turntable 51 on which the cable head 203 of the moving power cable 201 is mounted can be driven to rotate from the mounting position to the use position and from the use position to the mounting position, without human intervention.

6). Sixth Embodiment A sixth embodiment will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  In the present embodiment, the turntable 51 is rotationally driven by a hydraulic drive mechanism 141. The hydraulic drive mechanism 141 uses the expansion / contraction force of the hydraulic cylinder 142 spanned between the turntable 51 and the base 11 that forms the base body on the turntable 51, both between the mounting position and the use position. The rotational force in the direction is selectively applied.

  The hydraulic cylinder 142 forms a sealed space filled with oil inside a cylindrical cylinder case 143, and the sealed space is divided into two by a piston 144 (see FIG. 14), and a rod fixed to one surface of the piston 144 145 is configured to expand and contract by reciprocating sliding movement of the piston 144. The hydraulic cylinder 142 includes connecting portions 146 and 147 at the end of the cylinder case 143 and the end of the rod 145, respectively. The connecting portion 146 rotatably connects the cylinder case 143 to one base frame 12 forming the base 11. The connecting part 147 rotatably connects the rod 145 to the rotating frame 52 of the rotating table 51. As shown in FIGS. 11 to 13, the rotation axis directions of the connecting portions 146 and 147 are all the same as the axial direction of the rotation shaft 54 of the turntable 51. The mounting position of the hydraulic cylinder 142 is on the side of the bracket 53 where the cable head 203 of the power cable for movement 201 is mounted as viewed from the rotating shaft 54 of the turntable 51.

  The hydraulic drive mechanism 141 drives the hydraulic cylinder 142 by the drive unit DM. The drive unit DM is a mechanism that drives the hydraulic pump OP by the motor M, pumps up the oil stored in the oil tank OT by the hydraulic pump OP, and supplies the oil to the hydraulic cylinder 142 via the oil feed pipe P. The oil feed pipe P communicates with each sealed space divided into two in the cylinder case 143 of the hydraulic cylinder 142, and includes a supply path from the oil tank OT in which the hydraulic pump OP is interposed, and a return path to the oil tank OT. Form. Between these two paths, a switching valve CB is interposed to switch a space for supplying oil among the two divided spaces in the cylinder case 143. By this switching, the expansion and contraction of the rod 145 of the hydraulic cylinder 142 can be controlled. That is, if the oil supply destination is switched to the sealed space where the rod 145 is not provided, the piston 144 is pushed and the rod 145 can be extended by increasing the amount of oil in the space. Conversely, if the oil supply destination is switched to the sealed space where the rod 145 is provided, the piston 144 is pushed back by increasing the amount of oil in the space, and the rod 145 can be contracted.

  In such a configuration, the hydraulic drive mechanism 141 rotates the turntable 51 by the expansion and contraction of the rod 145 of the hydraulic cylinder 142. That is, when the turntable 51 is located at the mounting position, the rod of the hydraulic cylinder 142 is in a contracted state (see FIG. 11). In this state, when the hydraulic cylinder 142 is driven by the drive unit DM and the rod 145 is extended, the turntable 51 starts and starts rotating toward the use position (see FIG. 12). And in the state which rod 145 extended to the maximum, the turntable 51 is positioned in a use position (refer FIG. 13). In the present embodiment, the turntable 51 located at the use position is not vertically oriented but slightly inclined. To return the turntable 51 to the mounting position, the opposite process may be followed.

  Therefore, according to the present embodiment, the turntable 51 on which the cable head 203 of the moving power cable 201 is mounted is driven to rotate from the mounting position to the usage position and from the usage position to the mounting position, without manual intervention. be able to.

7). Seventh Embodiment A seventh embodiment will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  In the present embodiment, the support height of the turntable 51 can be changed in the column member 32 of the column 31 constituting the base. As a structure for that purpose, an elevating mechanism 151 that supports the rotating shaft 54 of the rotating table 51 so as to be movable up and down, and an elevating drive unit 153 that applies an external force to the rotating shaft 54 of the rotating table 51 to displace its vertical position. Provided.

  In the present embodiment, a rotary shaft 54 is rotatably attached to a rotary base frame 52 of the rotary base 51. The rotating shaft 54 is slidably supported in a long hole 152 that is formed in the column member 32 of the column body 31 and is long in the vertical direction. Here, an elevating mechanism 151 that supports the rotary shaft 54 of the turntable 51 so as to be movable up and down is formed.

  As shown in FIG. 16, the elevating drive unit 153 is configured using a rack and pinion mechanism as an example. That is, the rotation shaft 54 of the turntable 51 is fixed to the rack 154. The rack 154 is attached to the column member 32 of the column body 31 so as to be slidable in the vertical direction. The column member 32 regulates its movement trajectory so that the rack 154 slides only in the vertical direction. Such a rack 154 meshes with a pinion 155 that is rotatably attached to the column member 32. The lifting drive unit 153 transmits the rotation of the motor M to the pinion 155 via the gear train 156. At this time, in FIG. 16, when the pinion 155 is rotated in the clockwise direction, the rack 154 is moved downward by the rotation, and the rotating shaft 54 of the turntable 51 can be lowered. On the other hand, in FIG. 16, when the pinion 155 is rotated counterclockwise, the rack 154 is moved upward by the rotation, and the rotating shaft 54 of the turntable 51 can be raised. Such rotation of the pinion 155 in both directions can be realized, for example, by selectively rotating the output shaft of the motor M in both forward and reverse directions, and as another example, a rotation direction switching mechanism in the gear train 156. It can also be realized by providing (not shown).

  As shown in FIG. 17, the lifting drive unit 153 is configured using a pantograph mechanism as another example. The pantograph mechanism introduced here is configured by screwing a ball screw 158 to a frame 157 in which four links are respectively connected in pairs. The frame 157 is arranged in a diamond shape so that each pair of parts is positioned vertically and horizontally, and the pair of parts located in the lower part is a pedestal. The ball screw 158 is screwed to a pair of left and right pairs. The ball screw 158 has its winding direction reversed in the middle of the pair of left and right pairs. Accordingly, when the ball screw 158 is rotated in one direction, the pair of left and right treatment portions can be brought close to each other, and when the ball screw 158 is rotated in the opposite direction, the pair of left and right treatment portions can be separated from each other. it can. Thereby, the frame 157 changes the height of the even number located at the upper part according to the rotation of the ball screw 158. Therefore, the rotating shaft 54 of the turntable 51 is provided at the even number portion located in the upper part. The lift drive unit 153 has a handle 159 on one end side of the ball screw 158 so that the ball screw 158 can be easily rotated manually.

  In such a configuration, the height of the rotating shaft 54 of the turntable 51 can be freely changed by driving the elevating drive unit 153. As an example, in the present embodiment, as the above << procedure of installation of the power cable 201 for movement with respect to the gantry >>, an external force is applied to the rotation shaft 54 of the turntable 51 by the elevating drive unit 153, and the vertical position thereof is determined. Implement the installation process to displace. This installation process may be performed at any timing before and after the first installation process, before and after the second installation process, and before and after the third installation process. FIGS. 18 and 19 respectively show the mounting position and the use position when the rotation shaft 54 of the turntable 51 is positioned at the maximum height.

  However, what is important in the “installation process” is that the height of the rotating shaft 54 is set so that the moving power cable 201 maintains a bending radius that is a predetermined multiple or more of the finishing radius. That is. The “radius greater than a predetermined multiple of the finished radius” is, for example, about 25 times or a slightly smaller multiple. This numerical value may be uniquely determined by the manufacturer or seller of the mobile power cable 201, or may be determined uniquely by the user of the mobile power cable 201 (for example, a power company). Sometimes. In any case, it is generally a numerical value that should be determined in advance. In the present embodiment, the height of the rotating shaft 54 is set so that the bending radius of the moving power cable 201 is equal to or larger than the “predetermined predetermined multiple of the finished radius of the moving power cable 201”. It is to set. Conversely, in the present embodiment, since the vertical position of the rotating shaft 54 of the turntable 51 can be displaced, even when various types of power cables for movement 201 are used, It can be installed on the gantry so as to maintain a bending radius that is greater than a predetermined multiple of the finishing radius. In this sense, the “installation process” of the present embodiment is the same as the height of the cable head 203 mounted on the turntable 51 when the second installment process is performed and the turntable 51 is positioned at the use position. If it is carried out after confirmation, the appropriate height adjustment of the rotating shaft 54 can be performed efficiently.

  As described above, according to the present embodiment, the vertical position of the rotary shaft 54 of the turntable 51 can be displaced, and even when various types of power cables for movement 201 are used. It is possible to maintain a bending radius that is greater than a predetermined multiple of the finishing radius. Therefore, the width of the usable mobile power cable 201 can be increased.

Here, one point that may seem questionable is that if you want to maintain a bend radius that is greater than a predetermined multiple of the finished radius for various types of mobile power cables 201, you can adjust from the beginning. It may be sufficient to position the rotating shaft 54 of the turntable 51 at a position where the maximum height is reached. In this regard, according to the present embodiment, even when the rotating shaft 54 is at a low position, the moving power cable 201 that can maintain a bending radius greater than a predetermined multiple of the finished radius is positioned at a lower position. Therefore, the cable head 203 can be easily attached to the bracket 53 of the turntable 51. Further, even if the power cable 201 for movement cannot maintain a bending radius greater than a predetermined multiple of the finished radius unless the rotating shaft 54 is set at a higher position, the rotating shaft 54 is positioned horizontally at a lower position. In this case, the cable head 203 can be easily attached to the bracket 53 of the turntable 51. In the case of such a moving power cable 201, after the cable head 203 is attached to the bracket 53, the above "installation process" is performed so that a bending radius greater than a predetermined multiple of the finished radius can be maintained. do it. In these two examples, contrast with the state of FIG. 18 in terms of “horizontal”. From the above description, you can understand the technical significance that the rotation shaft 54 of the turntable 51 can be adjusted in the vertical direction.
8). Various Modifications and Modifications The first embodiment to the seventh embodiment have been described above. It goes without saying that various modifications and changes can be made in each embodiment.

11 Base (base)
14F Auxiliary base (Regulation Department)
31 Column (base)
33 Stopper (Regulator, fixed part)
51 turntable 53 bracket 101 damper 111 ratchet mechanism 121 operation drive unit 122 large gear (boost device)
123 Small gear (boost device)
131 Power transmission mechanism 141 Hydraulic drive mechanism 142 Hydraulic cylinder 151 Elevating mechanism 153 Elevating drive unit 201 Power cable for movement 203 Cable head G Idle gear (boost device)

Claims (10)

A base that is installed on the ground and a column that is fixed to the base and extends upward, and a base that supports the weight of the cable head included in the moving power cable;
A turntable provided with a bracket for mounting the cable head on one end side which is attached to the column body included in the base body so as to be rotatable around a horizontal axis and changes the height by rotation;
A restricting portion that regulates a rotation range of the turntable between a mounting position where the cable head is mounted on the bracket with the cable head sideways and a use position where the cable head is used in a vertical state;
A fixing portion for fixing the position of the turntable to the use position;
A cradle for a mobile power cable, characterized in that   The base is a part of the regulating part that supports a horizontal position extending from an end of the base and the rotary base at a portion facing the bracket side of the rotary base located at the mounting position. The pedestal for a power cable for movement according to claim 1, further comprising an auxiliary base that is rotatable between a vertical position and is positioned and fixed at the horizontal position and the vertical position.   The pedestal for the power cable for movement according to claim 1, further comprising a damper that exerts a buffering action on the turntable that rotates toward the mounting position.   3. The electric power for movement according to claim 1, further comprising a ratchet mechanism that allows releasable only rotation in a direction from the mounting position toward the use position among rotation directions of the turntable. Mount for cable.   The moving table according to claim 4, further comprising an operation driving unit that manually applies a rotational force in a direction from the mounting position to the use position via the booster on the turntable. A stand for power cables.   The power transmission mechanism which transmits the rotational driving force of a power source to the said turntable, and provides the rotational force of the direction toward the said use position from the said mounting position is provided. A stand for the power cable for movement according to any one of the above.   A bi-directional rotational force between the mounting position and the use position is selectively applied to the turntable using the expansion and contraction force of a hydraulic cylinder that spans between the turntable and the base body. The gantry for the power cable for movement according to any one of claims 1 to 4, further comprising a hydraulic drive mechanism. An elevating mechanism that supports the rotating shaft of the rotary table so as to be movable up and down in the column body;
An elevating drive unit for applying an external force to the rotating shaft of the turntable to displace its vertical position;
The gantry for the power cable for movement according to any one of claims 1 to 7, characterized by comprising: Using the mount for the mobile power cable according to any one of claims 1 to 7,
A first installation step of mounting a cable head included in the power cable for movement on the bracket of the turntable located at the mounting position;
Following the first installation step, the second installation step of rotating the turntable to move from the mounting position to the use position;
Following the second installation step, a third installation step of fixing the turntable to the use position by the fixing portion;
A first removal step of releasing the position fixing of the turntable to the use position by the fixing portion;
Following the second removal step, the second removal step of rotating the turntable to return from the use position to the mounting position;
Following the second removal step, a third removal step of removing the cable head from the bracket of the turntable located at the mounting position;
A method for installing and removing a gantry for a mobile power cable, comprising: Using the mount for the mobile power cable according to claim 8,
A first installation step of mounting a cable head included in the power cable for movement on the bracket of the turntable located at the mounting position;
Following the first installation step, the second installation step of rotating the turntable to move from the mounting position to the use position;
Following the second installation step, a third installation step of fixing the turntable to the use position by the fixing portion;
An external force is applied to the rotating shaft of the turntable by the elevating drive unit so that the moving power cable maintains a bending radius greater than a predetermined multiple of the finishing radius, and the vertical position of the moving cable is displaced. An installation process,
A first removal step of releasing the position fixing of the turntable to the use position by the fixing portion;
Following the second removal step, the second removal step of rotating the turntable to return from the use position to the mounting position;
Following the second removal step, a third removal step of removing the cable head from the bracket of the turntable located at the mounting position;
A method for installing and removing a gantry for a mobile power cable, comprising:

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