JP2023140110A - Come-along for anchoring overhead line and temporary support method of overhead line tensile force using the same - Google Patents

Abstract

To provide a strong come-along for drawing an overhead line capable of temporarily gripping the overhead line by setting the overhead line on the overhead line by a remote operation from an iron tower without using a midair stunt machine and a self-propelled machine.SOLUTION: A come-along 1 has a gripping device 2 and an operation bar 3. The gripping device 2 grips an overhead line G between upper and lower clamps 5 and 6 at a position apart from an iron tower T on the overhead line G, and draws the overhead line to the iron tower T by towing means. The operation bar 3 slips the gripping device 2 to a setting position on the overhead line G to be sent by a remote operation from the iron tower T, and makes the upper and the lower clamps 5 and 6 temporarily grip the overhead line G. The upper clamp 5 falls in conjunction with rotations around an axis of the operation bar 3, and temporarily grips the overhead line G by an initial gripping force with respect to the lower clamp 6. A link mechanism 7 is connected to the lower clamp 6 so as to raise the lower clamp 6 in accompany with towing of the towing means, and thereby is provided so that the overhead line G may be gripped by gripping force added to the initial gripping force with respect to the upper clamp 5.SELECTED DRAWING: Figure 1

Description

During construction work such as replacing existing overhead wires such as ground wires or replacing accompanying equipment around overhead wires, it is necessary to pull the overhead wires to the tower and temporarily fasten them during the work of disconnecting or connecting the overhead wires from the tower. , the tension is transferred to the steel tower and the tension at the work area is eliminated. The present invention relates to a come-along that is used in such construction work to pull overhead lines toward the steel tower and temporarily support them.

For example, when disconnecting an existing overhead line from the connection to a steel tower, the overhead line is separately tightened with a come-along and temporarily fastened to the tower, and the tension at the connection is temporarily transferred to the tower before the work is carried out. In this case, the come-along needs to be attached to the overhead line at a location farther away from the tower than the connection.
The come-along described in Patent Document 1 includes a wedge member split into two parts for gripping an electric wire, a cylindrical come-along main body into which the wedge member is inserted, and an arm coupled to the come-along main body. The outer circumferential surface of the wedge member and the inner circumferential surface of the come-along body are formed in a tapered shape on the insertion side. After attaching the wedge member into which the electric wire is inserted to the come-along body and connecting it to the steel tower, when the arm is pulled with a chain block or the like, the electric wire can be gripped by the wedge member and the come-along body and tightened.
In the come-along described in Patent Document 2, an arm connected to a wire of a chain block coupled to a steel tower and a clamp equipped with a pair of opposing clamping pieces that receive and grip an electric wire inside are connected by a link. The pair of clamping pieces can grip the electric wire and tension it by relative movement of the arm and the clamp in the wire extension direction as the arm is pulled by the chain block.
The self-propelled come-along described in Patent Document 3 includes a main body that can be moved by passing an overhead electric wire between it and a wedge, and a self-propelled vehicle located behind the main body in the direction of movement of the main body, and the self-propelled vehicle is moved by a push rod. The device presses the main body and travels on the overhead wires, transporting the main body to a predetermined gripping position. After retrieving the vehicle by running the vehicle in reverse, the wire connected to the handle of the main body is pulled with a winch, etc., and a wedge is pushed into the main body via a cam mechanism to grasp and pull the wire.

Utility Model Publication No. 58-193807 Patent No. 4121081 Publication No. 3-006100

In both of the come-alongs described in Patent Documents 1 and 2, the installation and removal work is carried out by a worker riding an aerial vehicle suspended from an overhead wire and moving to a position beyond the connection part (for example, the tip of the insulator). There is a need to do. There is a problem in that this cannot be applied to small-diameter overhead lines because the use of aerial vehicles themselves is prohibited.
The self-propelled come-along described in Patent Document 3 cannot be used if there is an obstacle such as a damper on the wire, and requires a power source or other driving source, so the increased weight reduces overall workability. invite Further, there is a problem in that electrical equipment deteriorates quickly over time, and troubles are likely to occur due to the fragility of the electrical equipment, such as difficulty in recovering equipment due to failure.
Therefore, the present invention provides a come-along for pulling overhead lines that can be attached to and removed from overhead lines by remote control by a worker on a steel tower without using an aerial vehicle or an electric self-propelled machine, and that is also robust. The purpose of this invention is to provide a construction method that temporarily supports the tension of overhead wires on a steel tower during the construction period.

In the following description, reference numerals in the accompanying drawings will be referred to, but the invention is not limited thereto.
A come-along 1 of the present invention for solving the above problems includes a gripping device 2 and an operating rod 3 connected to the gripping device 2. The gripping device 2 grips the overhead wire G between upper and lower clamps 5 and 6 at a position away from the tower T on the overhead wire G held by the tower T, and pulls it to the tower T using a traction means such as a chain block C. It will be done. The operating rod 3 is connected to the gripping device 2, slides the gripping device 2 that receives the overhead wire G between the open upper and lower clamps 5 and 6 over the overhead wire G to the installation position, sends it out, pulls it back, and closes the upper and lower clamps. A gripping device 2 is provided so as to be remotely controllable from the top of the steel tower so that the overhead wire G can be temporarily gripped by bringing the wires 5 and 6 close to each other with an initial gripping force, and can be moved apart to release the grip. The gripping device 2 is supported on the main body 4 so as to be relatively movable up and down, and is supported on the main body 4 so as to be movable relative to the upper clamp 5 placed on the overhead wire G, and facing below the upper clamp 5. The link mechanism 7 is supported on the main body 4, is connected to a traction means at one end, and is connected to the lower clamp 6 at the other end. The upper clamp 5 temporarily grips the overhead wire G between itself and the lower clamp 6 by lowering relative to the main body 4 in conjunction with the rotation of the operating rod 3 around the axis, and then ascends again to stop gripping. It is provided to be released. The link mechanism 7 is connected to the lower clamp 6 so as to push up the lower clamp 6 as the traction means is pulled, and thereby grips the overhead wire G with a gripping force that is added to the initial gripping force between the link mechanism 7 and the upper clamp 5. It is set up so that
Further, the method for temporarily supporting the overhead wire G using the come-along 1 of the present invention is to take the overhead wire G between the upper and lower clamps 5 and 6 with the upper and lower clamps 5 and 6 of the gripping device 2 open, and 2 on the overhead wire G, and then, using the operating rod 3 connected to the gripping device 2, the gripping device 2 is slid on the overhead wire G and moved to a predetermined installation position. Then, by rotating the operating rod 3 in one direction around the axis and lowering the upper clamp 5 relative to the main body 4, an overhead line G is created between the upper and lower clamps 5 and 6. A third step is to temporarily hold the link mechanism 7 with an initial grip force, and then, by pulling one end side of the link mechanism 7 with a traction means, the lower clamp 6 is pushed up and an overhead wire is formed between it and the upper clamp 5. A fourth step is to grasp G with a gripping force added to the initial gripping force, pull it toward the steel tower T side and temporarily support it, thereby eliminating the tension on the overhead wire G at a predetermined construction location, and following this, A fifth step of reducing the gripping force between the upper and lower clamps 5 and 6 by loosening the traction by the traction means, and following this, rotating the operating rod 3 connected to the gripping device 2 in the opposite direction around the axis. As a result, the upper clamp 5 is raised relative to the main body 4, and the gap between the upper clamp 5 and the lower clamp 6 is opened to release the grip on the overhead wire G and release the tension. A seventh step of pulling the gripping device 2 along the overhead wire G to the hand by tracing the connected operating rod 3 and removing it from the overhead wire G is included.

According to the present invention, a come-along for pulling overhead lines can be easily installed and removed by a worker on a steel tower by remote control without using an aerial vehicle or an electric self-propelled machine, and is also robust. By using this, it is possible to provide a temporary support construction method for overhead lines that allows work to be carried out safely and quickly.

FIG. 1 is a perspective view of a come-along for overhead wire retaining according to the present invention. FIG. 2 is an explanatory diagram of how the come-along shown in FIG. 1 is used. FIG. 2 is a front view of a come-along for securing overhead wires according to the present invention. FIG. 2 is a front view of the gripping device in the come-along of FIG. 1; FIG. 2 is a right side view of the gripping device in the come-along mode of FIG. 1; FIG. 2 is a left side view of the gripping device in the come-along mode of FIG. 1; FIG. 2 is a rear view of the gripping device in the come-along of FIG. 1; 5 is a sectional view taken along line VIII-VIII in FIG. 4. FIG. 5 is a sectional view taken along line IX-IX in FIG. 4. FIG. The operating rod in the come-along shown in FIG. 1 is shown, with (A) being a front view and (B) being a plan view. The process of the come-along operation (open position) in FIG. 1 is shown, with (A) being a front view and (B) being a side view. The process of the come-along operation (closed position) in FIG. 1 is shown, with (A) being a front view and (B) being a side view. The process of the come-along operation (temporary gripping position) in FIG. 1 is shown, with (A) being a front view and (B) being a side view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a come-along for securing overhead wires according to the present invention will be described with reference to the drawings.

For example, as shown in Fig. 2, come-along 1 is used to connect the overhead wire G to the tower T during the work of removing the overhead wire G from the insulator chain I during construction work such as replacing the existing overhead wire G that is tied to the steel tower T. When carrying out the construction method in which the overhead wire G is temporarily attached to the steel tower T and the tension is temporarily applied, the overhead wire G is held in front of the removal point with the gripping device 2, and the overhead wire G is attached to the tower T via the traction wire W, chain block C, etc. It is used for temporary support by pulling it to the ground, and after the construction is completed, it is removed from the overhead line G and collected.

As shown in FIGS. 1 and 3, the come-along 1 includes a gripping device 2 and an operating rod 3. As shown in FIGS. The gripping device 2 is placed on an overhead wire G such as an existing overhead ground wire held by a steel tower T, grips the overhead wire G, and is pulled by a chain block C or the like on the steel tower T via a traction wire W. .

The operating rod 3 can be connected to and separated from the gripping device 2, and can be operated from the top of the steel tower T to feed the gripping device 2 to a predetermined installation position on the overhead wire G, and can also be operated remotely to send the gripping device 2 to the overhead wire G. After applying the initial gripping force, it is separated from the gripping device 2.

As best shown in FIGS. 4 to 9, the gripping device 2 includes a main body 4, an upper clamp 5 supported on the main body 4 so as to be relatively movable up and down, and placed on an overhead wire G, and a gripping device 2 arranged below the upper clamp 5. A lower clamp 6 is provided which faces each other and is supported on the main body 4 via a link mechanism 7 so as to be relatively movable up and down. The link mechanism 7 is supported on the main body 4, connected to the pulling wire W at one end, and connected to the lower clamp 6 at the other end.

The upper clamp 5 temporarily grips the overhead wire G with an initial gripping force between it and the lower clamp 6 by lowering relative to the main body 4 in conjunction with the rotation of the operating rod 3 in one direction around the axis. Moreover, it is provided so that it can be lifted by rotation in the other direction to release the grip.

The link mechanism 7 is connected to the lower clamp 6 so as to push up the lower clamp 6 as the traction wire W is pulled, and thereby, the link mechanism 7 is connected to the upper clamp 5 with a gripping force that is an addition of the overhead wire G to the initial gripping force. It is provided to be gripped.

As shown in FIGS. 5 and 6, the main body 4 of the gripping device 2 includes a flat support plate portion 41 disposed along the overhead line G on one side (rear side) in the direction perpendicular to the extension of the overhead line G. As clearly shown in FIGS. 7, 8, and 9, the threaded cylinder part 42 is provided so as to project from the upper part of the support plate part 41 onto the front overhead line G. A plurality of ribs 411 are formed on the rear side of the support plate portion 41 .

As clearly shown in FIGS. 5 and 6, the upper clamp 5 is provided on the front side of the support plate portion 41 and includes a clamp body 51 placed on the overhead wire G and a threaded rod 52. As clearly shown in FIGS. 7 and 8, the threaded rod 52 extends upwardly from the center of the clamp body 51 so as to be freely rotatable around the axis, is screwed into the threaded cylinder part 42, and is connected to the threaded rod 52 at the upper end via the transmission mechanism 8. , can be connected to and separated from the tip of the operating rod 3. The threaded rod 52 is rotated in forward and reverse directions by rotation of the operating rod 3 connected to the transmission mechanism 8 around its axis, and moves up and down with respect to the main body 4 along the threaded cylinder portion 42 together with the clamp main body 51. When the clamp body 51 is lowered relative to the main body 4 while the clamp main body 51 is on the overhead wire G, the main body 4 is pulled up relative to the overhead wire G together with the lower clamp 6.

As clearly shown in FIG. 4, guide members 53 are fixed to both front and rear ends of the clamp body 51 in the extending direction. As clearly shown in FIGS. 5 and 6, the guide member 53 extends from the clamp body 51 to the front side in the direction orthogonal to the line so as to hang on the overhead line G, and when the gripping device 2 is hung on the overhead line G, A roughly V-shaped notch opening downward is provided so that the wire G can be slid and guided under the upper clamp 5.

As best shown in FIGS. 4 and 8, the transmission mechanism 8 is provided within a gear case 81. The upper end of the threaded rod 52 and the inner end of the connecting shaft 82 that connects the operating rod 3 are received in the gear case 81 in directions orthogonal to each other so as to be freely rotatable around the respective axes. A connection plate 85 is pivotally supported on the connection shaft 82 by a pivot pin 82a. The connecting plate 85 is provided with a detachable rod 85a protruding in the direction perpendicular to the wire extension on the distal end side. Bevel gears 83 and 84 fixed to the upper end of the threaded rod 52 and the inner end of the connecting shaft 82, respectively, mesh within the gear case 81, and rotation of the connecting shaft 82 is transmitted to the threaded rod 52.

As clearly shown in FIGS. 4 and 8, a flat pinion support plate 9 extending downward parallel to the support plate portion 41 is fixed to the front side surface of the gear case 81 with bolts 91. A pair of front and rear pinion gears 10 in the longitudinal direction are supported by a shaft 101 on the rear side surface of the pinion support plate 9 .

A shutter plate 11 is provided so as to overlap the pinion support plate 9 so as to be relatively movable up and down. The shutter plate 11 is for preventing the gripping device 2 from derailing from the overhead wire G by closing the front opening between the upper and lower clamps 5 and 6 when the gripping device 2 is moved on the overhead wire G. be. As best shown in FIGS. 7, 8, and 9, vertical racks 12 that mesh with the pinion gear 10 are attached to the front and rear vertical edges of the shutter plate 11 in the longitudinal direction with bolts 121, 122. As shown in FIG. 9, a vertical guide groove 123 is formed in the mounting seat of the rack 12 and is slidably engaged with the vertical edge of the pinion support plate 9. The shutter plate 11 is guided by both edges of the pinion support plate 9 that fits into the guide groove 123, moves up and down with respect to the pinion support plate 9, and in the upper open position, the side opening between the upper and lower clamps 5 and 6. is opened to allow the overhead wire G to be received between the upper and lower clamps 5 and 6, and the side openings are closed in the lower closed position to prevent the gripping device from derailing from the overhead wire G. A pair of vertical elongated holes 11a formed in the shutter plate 11 are elongated holes through which the protrusion of the shaft 101 of the pinion gear 10 escapes.

As clearly shown in FIG. 9, another rack 13 that meshes with the pinion gear 10 is fixed to the threaded cylinder portion 42. When the threaded rod 52 moves up and down with the pinion support plate 9 with respect to the threaded cylinder portion 42, the pinion gear 10 that meshes with the rack 13 rotates, causing the shutter plate 11 to move up and down in the same direction. Therefore, when the threaded rod 52 rotates and descends with respect to the main body 4 together with the upper clamp 5 and pinion support plate 9, the shutter plate 11 also descends to close the opening between the upper and lower clamps 5 and 6. Operate.

As clearly shown in FIG. 8, the link mechanism 7 is supported between a support plate part 41 and a cover plate 43 fixed to the support plate part 41 with bolts 44 at a distance in parallel to the front side thereof. As clearly shown in FIGS. 4 and 8, the link mechanism 7 includes a generally arc-shaped towing lever 71 connected to the towing wire W, and a generally arcuate L that rotates to push up the lower clamp 6 when the towing lever 71 is pulled. A push-up lever 72 in the shape of a letter is provided.

The traction lever 71 is connected to the traction wire W at one end, is pivoted to the support plate part 41 by a shaft 73 in an intermediate circular arc-shaped elongated hole 71a, and is pivoted to one end of the push-up lever 72 by a shaft 74 at the other end. be done. The push-up lever 72 is pivoted to the link plate 62 of the lower clamp 6 by a shaft 75 at the middle, and pivoted to the support plate portion 41 by a shaft 76 at the other end. The traction lever 71 and the push-up lever 72 are biased by a spring 77 interposed between the shaft 74 and the bolt 44 so as to position the lower clamp 6 lower.

As clearly shown in FIG. 8, the lower clamp 6 includes a clamp body 61 and a link plate 62. The clamp body 61 abuts against and grips the lower surface of the overhead wire G. A pair of link plates 62 are sandwiched between the front and rear of the clamp body 61 and extend downward, and are pivotally connected to the intermediate portion of the push-up lever 72 by a shaft 75 at the lower part.

The operating rod 3 will be explained with reference to FIGS. 1, 3, and 10. The operating rod 3 is composed of a telescopic pipe consisting of three component tubes 31, 32, and 33, which are mutually extendable, retractable, and fixable. Connected detachably.

A notch groove 31a in a direction perpendicular to the tube axis is formed at the distal end of the first component pipe 31 to receive the detachable rod 85a, and a connecting clevis 34 that is orthogonal to the notch groove 31a and holds the detachable rod 85a is formed inside the groove 31a. is provided and urged to the holding position by a spring 35. The connecting clevis 34 is locked to the proximal end of the third constituent pipe 33 by an operating knob 37 via an operating wire 36 passing through the three constituent pipes 31 , 32 , 33 . When the connecting clevis 34 in the holding position is pulled to the detached position via the operating knob 37 and the operating wire 36, the detachable rod 85a is released and the operating rod 3 is separated from the transmission mechanism 8.

A rotary operation handle 39 is connected to the base end of the third component pipe 33 via a torque limiter 38 . The rotation of the rotary operating handle 39 is transmitted to the connecting shaft 82 of the transmission mechanism 8 via the operating rod 3 within an allowable torque range.

Next, tension work using the come-along of the present invention will be explained. As shown in FIG. 11, with the upper and lower clamps 5 and 6 of the gripping device 2 open, the guide member 53 is hung on the overhead wire G, and the overhead wire G is connected between the upper and lower clamps 5 and 6 (below the upper clamp 5). Incorporate into. In this state, the entire device is supported on the overhead wire G.

Next, when the operating rod 3 is rotated to the right around the axis by the rotary operating handle 39 and the threaded rod 52 is rotated via the transmission mechanism 8, the threaded rod 52 is attached to the main body of the gripping device 2, as shown in FIG. 4 along the threaded cylinder portion 42. Since the transmission mechanism 8, pinion support plate 9, and upper clamp 5 are integrated with the threaded rod 52, they descend with respect to the main body 4 together with the threaded rod 52. Since the clamp body 51 is placed on the overhead wire G, when the upper clamp 5 is lowered relative to the main body 4, the main body 4 is pulled up with respect to the overhead wire G together with the lower clamp 6. When the main body 4 and the pinion support plate 9 are vertically displaced relative to each other, the pinion gear 10 on the pinion support plate 9 is rotated by the rack 13 fixed to the main body 4, and the shutter plate is rotated through the rack 12 fixed to the shutter plate 11. 11 descends, closing the side opening between the upper and lower clamps 5 and 6, and preventing the gripping device 2 from derailing.

In this state, while extending the operating rod 3, the gripping device 2 is slid on the overhead wire G and moved to a predetermined position. When the gripping device 2 reaches a predetermined position, the operating rod 3 is further rotated clockwise to pull up the lower clamp 6 together with the main body 4, thereby connecting the overhead wire G between the upper and lower clamps 5 and 6, as shown in FIG. Temporary gripping is performed using the initial gripping force. When the overhead wire G is gripped between the upper and lower clamps 5 and 6, the rotation operating handle 39 of the operating rod 3 is rotated idly by the torque limiter 38, which indicates that the temporary gripping is completed.

In this state, the operating knob 37 is pulled to remove the connecting clevis 34 from the detachable rod 85a, and the operating rod 3 is removed from the gripping device 2 and recovered.

Next, when the traction wire W connected to the traction lever 71 is pulled toward the tower T side by the chain block C, the push-up lever 72 rotates counterclockwise around the shaft 76 in FIG. The lower clamp 6 is pushed up through the cable to strengthen the grip on the overhead wire G and draw the overhead wire G toward the tower T side. The spring 77 rotates the push-up lever 72 clockwise to stop the lower clamp 6 from rising until the traction lever 71 is pulled by the traction wire W.

The line work is now complete. This eliminates the tension on the overhead wire G at the construction site, making it possible to carry out the specified construction work.

When the predetermined work is completed, the chain block C is loosened to reduce the gripping force between the upper and lower clamps 5 and 6, and then the operating rod 3 is connected to the transmission mechanism 8 of the gripping device 2 again. After pulling the operation knob 37 to open the cutout groove 31a and receiving the detachment rod 85a into the cutout groove 31a, the operation knob 37 is returned to engage the connection clevis 34 with the detachment rod and lock it.

By rotating the rotation operation handle 39 to the left, the threaded rod 52 is rotated via the transmission mechanism 8, the upper clamp 5 is raised relative to the main body 4, and the space between it and the lower clamp 6 is opened to grip the overhead wire G. to release the tension. At this time, the rotation of the operating rod 3 is kept to a minimum level so as not to open the shutter plate 11. In this state, the operating rod 3 is retracted to draw the gripping device 2 toward the steel tower T side. During this time, since the shutter plate 11 closes the side opening between the upper and lower clamps 5 and 6, the gripping device 2 does not derail from the overhead line G. When the gripping device 2 is drawn to the hand, the operating rod 3 is further rotated to the left to pull up the shutter plate 11, and the gripping device 2 is removed from the overhead wire G and recovered.

1 Come-along 2 Gripping device 3 Operating rod 31 First constituent pipe 31a Notch groove 32 Second constituent pipe 33 Third constituent pipe 34 Connection clevis 35 Spring 36 Operating wire 37 Operating knob 38 Torque limiter 39 Rotary operating handle 4 Main body 41 of the grasping device Support plate portion 411 Rib 42 Threaded cylinder portion 43 Cover plate 44 Bolt 5 Upper clamp 51 Clamp body 52 Threaded rod 53 Guide member 6 Lower clamp 61 Clamp body 62 Link plate 7 Link mechanism 71 Traction lever 71a Arc-shaped long hole 72 Push-up lever 73 Shaft 74 Shaft 75 Shaft 76 Shaft 77 Spring 8 Transmission mechanism 81 Gear case 82 Connection shaft 82a Pivot pin 83 Bevel gear 84 Bevel gear 85 Connection plate 85a Detachable rod 9 Pinion support plate 91 Bolt 10 Pinion gear 101 Shaft 11 Shutter plate 11a Length Hole 12 Rack 121 Bolt 122 Bolt 123 Guide groove 13 Rack C Chain block G Overhead wire I Insulator chain T Steel tower W Traction wire

Claims (5)

A gripping device that is disposed on an overhead line held by a steel tower at a position away from the steel tower, grips the overhead wire between upper and lower clamps, and is pulled toward the steel tower by a traction means;
The gripping device connected to the gripping device and receiving the overhead wire between the open upper and lower clamps is slidable over the overhead wire to an installation position and can be pulled back, and the upper and lower clamps are moved closer to each other. an operating rod for remotely controlling the gripping device from above the tower so as to temporarily grip the overhead wire with an initial gripping force and release the grip by separating the wire;
The gripping device includes a main body, an upper clamp supported on the main body so as to be relatively movable up and down, and placed on the overhead wire, and an upper clamp that is disposed below the upper clamp and movable relatively up and down on the main body. comprising the lower clamp supported, and a link mechanism supported on the main body, connected to the traction means at one end side, and connected to the lower clamp at the other end side,
The upper clamp descends relative to the main body as the operating rod rotates around the axis in one direction, temporarily grips the overhead wire with the lower clamp, and rises as the operating rod rotates in the other direction. is provided to release the grip when
The link mechanism is connected to the lower clamp so as to push up the lower clamp as it is pulled by the traction means, thereby gripping the overhead wire with a gripping force that is added to the initial gripping force between the link mechanism and the upper clamp. A come-along for pulling overhead wires, characterized in that it is provided so as to be gripped. A threaded cylindrical portion having an axis in the vertical direction is provided on the main body,
The upper clamp is connected to a threaded rod that is screwed into the threaded cylinder portion and moves up and down,
The come-along for pulling an overhead line according to claim 1, wherein the threaded rod is provided so as to receive rotation around an axis of the operating rod via a transmission mechanism. A shutter plate is provided on the main body and moves up and down between an upper open position and a lower closed position in conjunction with the up and down movement of the threaded rod,
The shutter plate opens a lateral opening between the upper and lower clamps in an upper open position to allow the overhead wire to be received between the upper and lower clamps, and closes the lateral opening in a lower closed position. The come-along for pulling an overhead line according to claim 1, wherein the come-along is provided to prevent the gripping device from derailing from the overhead line. 2. The operating rod is formed of a telescopic pipe made up of a plurality of component tubes that are mutually extendable and fixed, and is detachably connected to the gripping device at the distal end of the component tubes on the distal end side. Come-along for pulling overhead lines as described in 1. A method for temporarily supporting overhead wire tension using the come-along according to claim 1,
A first step of taking the overhead wire between the upper and lower clamps of the gripping device with the upper and lower clamps open, and supporting the gripping device on the overhead wire;
Following the first step, a second step of sliding the gripping device on an overhead wire to a predetermined installation position using the operating rod connected to the gripping device;
Following the second step, by rotating the operating rod in one direction around the axis and lowering the upper clamp relative to the main body, the overhead wire is tightened between the upper and lower clamps with an initial gripping force. a third step of temporarily gripping the
Following the third step, one end of the link mechanism is pulled by the traction means to push up the lower clamp and grip the overhead wire with the upper clamp by adding it to the initial gripping force. a fourth step of temporarily supporting the overhead wire by pulling it toward the steel tower while grasping it with force, thereby eliminating the tension in the overhead wire at a predetermined construction location;
a fifth step of reducing the gripping force between the upper and lower clamps by loosening the traction by the traction means after the completion of the construction at the predetermined construction location;
Following the fifth step, by rotating the operating rod connected to the gripping device in the opposite direction around the axis, the upper clamp is raised relative to the main body, and the space between it and the lower clamp is raised. a sixth step of opening and releasing the grip on the overhead wire to release the tension;
Following the sixth step, a seventh step of dragging the operating rod connected to the gripping device to pull the gripping device to the hand along the overhead wire and removing it from the overhead wire. Features a temporary support method for overhead wire tension.

Images