Spare wire rope tensioning device and tensioning method

Abstract

To provide a spare wire rope stretching device and a spare wire rope stretching method for reducing a part of stringing work of an overhead wire by remote control.SOLUTION: The spare wire rope stretching device 2 includes a traveling vehicle body 21 freely traveling between the overhead wire support bodies along one overhead wire 1 stretched between the overhead wire support bodies, and a transmitter / receiver for operating the traveling vehicle body by remote control. When an overhead wire such as an electric wire is installed between utility poles, that is, between overhead wire supports, a relatively light rope for leading and towing, that is, a spare wire rope for pulling, leading, and towing a tip of a new electric wire from one utility pole as an extension source of the electric wire toward the other utility pole as an extension destination is stretched between both utility poles.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The spare line rope tensioning device of the present invention is an unprecedented device used in cable installation work in a broad sense, including cable extension work such as replacing an old cable with a new cable or installing an additional new cable between telegraph poles that serve as cable support bodies, for example, in the field of electric cable installation.When installing an electric cable or other cable between telegraph poles, i.e., between cable support bodies, the device stretches and installs a relatively light leading and pulling rope, i.e., spare line rope, between the two telegraph poles to lead and pull the tip of the new cable, for example, from one telegraph pole where the cable begins to be extended to the other telegraph pole where it is to be extended. [Background technology]

[0002] The background art will be explained below using installation work in the field of electric wiring equipment as an example. As mentioned above, the spare line rope in this field is a leading traction rope that is stretched in advance between the telegraph poles where extension is planned when an electric wire (overhead line) is stretched and installed between telegraph poles (between overhead line supports) to guide the new electric wire.The tip of the new electric wire is detachably fastened to the rear end of the spare line rope stretched between the telegraph poles, i.e., at the rear end of the spare line rope, i.e., at the telegraph pole side where the wire is to be extended, and then the rope is wound up at the front end of the spare line rope, i.e., at the other telegraph pole side where the wire is to be extended, thereby erecting the new electric wire between the two telegraph poles, i.e., the planned extension section.

[0003] Conventionally, the work of stretching such a spare line rope between telephone poles has been as follows. First, to loop the tip of the spare line rope around an appropriate rope-feeding means such as a pulley installed on the high side of the telegraph pole from which the line is to be extended between the two telegraph poles in the extension section, i.e., at the planned height where the new line is to be erected, a worker climbs the telegraph pole or uses an aerial work vehicle or the like as a foothold and manually lifts the tip of the spare line rope that is placed on the ground. Next, the tip of the spare line rope that has been wound around as described above is lowered back to the ground on the utility pole from which the line was extended, and the tip of the spare line rope is pulled on the ground by hand or with a work vehicle, etc., to the utility pole to which the line is to be extended.

[0004] Next, at the telegraph pole side where the cable is to be extended, the tip of the spare line rope is again looped around an appropriate rope-feeding means such as a pulley installed at a high point on the telegraph pole, i.e., at the planned height where the new cable will be installed, in the same manner as the work at the cable extension source described above. Then, the tip of the spare line rope that has been reeled in at the end of the line extension is manually pulled down to the ground on the telegraph pole side of the end of the line extension. The tip of the spare line rope thus pulled down is wound up by hand or using a work vehicle or winding device on the ground side of the telegraph pole to which the line is to be extended, and the tip of the new electric wire hooked to the rear end of the spare line rope is pulled out between the telegraph poles, thereby installing the new electric wire in the extension section.

[0005] As mentioned above, the end of the spare line rope is first hung high on the telegraph pole from which the line is to be extended and then lowered to the ground, and then dragged and pulled along the ground to the telegraph pole to which the line is to be extended.Dragging and pulling is hard work and inefficient even if there are no obstacles on the ground, but in reality the presence of numerous obstacles makes the work even more difficult. In other words, three high-voltage power lines are generally installed on the high side of a telegraph pole, and three low-voltage power lines are installed on the low side. Particularly in urban areas, not only do many household power supply branch lines branch off from these three low-voltage power lines, but also many telephone lines and other lines are installed on the even lower side of the low-voltage power lines. Many household branch lines also branch off from these various communication lines and lines, and these many branch lines create obstacles when stringing spare line ropes.

[0006] Since the preliminary rope is used to erect the low-voltage and high-voltage wires described above, for example, when erecting a low-voltage wire, the preliminary wire rope must be stretched at a position at least higher than the height at which the low-voltage wire will be erected, and when erecting this low-voltage wire, it must be stretched above, above the many obstacles described above. To achieve this, whenever an obstacle was present, workers were forced to park a high-altitude work vehicle or similar at the location in question, then manually lift the tip of the spare line rope to a height above the obstacle, forcing the worker to manually move the rope over the branch line branch or other obstacle, which was an extremely inefficient operation. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to solve the above-mentioned inconvenient problems, and aims to provide a backup line rope tensioning device that can efficiently tension a backup line rope between telegraph poles at a desired height, regardless of the presence or absence of obstacles such as a branch wire branching off laterally from an electric wire or communication line located at a relatively low position between the telegraph poles as described above, and to provide a method of erecting a string of overhead lines using said device. The present invention also aims to improve the efficiency of overhead line erection work not only in the field of electric cable installation but also in a broader range, between overhead line supports for other communication lines, etc. [Means for solving the problem]

[0008] The spare line rope tensioning device of the present invention is capable of freely traveling along an existing overhead line such as a single electric wire that has already been strung between overhead line supports such as telegraph poles, and is equipped with a traveling vehicle body that detachably pulls the tip of the spare line rope, and a transceiver that freely controls the traveling vehicle body by remote control.A method of erecting an overhead line using the spare line rope tensioning device of the present invention comprises first suspending the traveling vehicle body of the spare line rope tensioning device detachably on an appropriate overhead line between the overhead line supports where extension of the line is planned, using the spare line rope tensioning device of the present invention, Next, the tip of the spare line rope is unwound via an appropriate feeding means such as a pulley arranged at a high position on one of the overhead line supports (the origin of the extension) between the overhead line supports, and is detachably attached to the running vehicle body.The spare line rope is then stretched between the overhead line supports by remotely controlling the running vehicle body from one of the overhead line supports (the origin of the extension) to the other of the overhead line supports (the destination of the extension).

[0009] That is, the invention of the spare line rope tensioning device of claim 1 is characterized in that it comprises a running vehicle body that travels freely between the overhead line supports along a single overhead line stretched between the overhead line supports, a transmitter / receiver that remotely controls the running vehicle body, and the running vehicle body is equipped with a rope locking device that detachably locks the tip of the spare line rope.

[0010] The invention of the spare line rope tensioning device of claim 2 is a traveling vehicle body of claim 1, comprising at least a pair of front and rear wheels that ride on the top surface of the overhead wire, and a traveling guide saddle supported by the pair of wheels, straddling the overhead wire, and extending along the overhead wire opposite to both side sides of the overhead wire; The vehicle frame is characterized in that it has a lower hanging weight portion that extends downward from each lower end side of the travel guide saddle portion and also functions as a weight to maintain the left and right balance of the traveling vehicle body.

[0011] The invention of the spare line rope tensioning device of claim 3 is characterized in that the car body frame of claim 2 is provided with a running car body component including at least a battery, a motor, a wheel drive mechanism for driving a pair of wheels, and a receiver for receiving an operating signal from a transmitter, and a supplementary weight mounting section to which a supplementary weight required to maintain balance between the left and right sides of the running car body can be attached and detached is provided on either or both of the downward hanging extension weight sections.

[0012] The invention of the spare line rope tensioning device of claim 4 is characterized in that in the running guide saddle portion and downward hanging extension portion of claims 2 and 3, the relative distance between the two inner surfaces facing each other with the overhead wire in the center is larger than the connection enlarged diameter portion where the connection part of the overhead wire is enlarged, so that the running vehicle body can pass through the connection enlarged diameter portion.

[0013] The invention of the spare line rope tensioning device of claim 5 is characterized in that a reverse surface portion is provided on both opposite end edges of the running guide saddle of claims 2 and 3, with the overhead wire on the front and rear sides in the center, so that the relative distance gradually increases toward the outside.

[0014] The invention of the spare line rope tensioning device of claim 6 is characterized in that air holes are provided in both or either of the downward extending weight portions hanging down on both the left and right sides of the overhead line of claims 2 and 3 to reduce crosswind pressure.

[0015] The invention of the spare line rope tensioning device of claim 7 is characterized in that a guide disk is provided on both sides of at least one pair of front and rear wheels of claims 2 and 3 to prevent the overhead wire from coming off the wheel periphery.

[0016] The invention of the spare wire rope tensioning device of claim 8 is characterized in that the guide discs on both sides of each wheel of claim 7 are shaped so that the relative distance between the inner surfaces of the opposing discs gradually increases from the wheel axle side toward the outer edge side of the wheel.

[0017] The invention of the spare line rope tensioning device of claim 9 is characterized in that the shape gradually expanding from the wheel axle side toward the outer periphery side of claim 8 is a curved line shape.

[0018] The invention of the spare line rope tensioning device of claim 10 is characterized in that the shape gradually expanding from the wheel axle side toward the outer periphery side of claim 8 is linear.

[0019] The invention of the spare line rope tensioning device of claim 11 is characterized in that the guide discs of claims 7 to 10 are annular.

[0020] The invention of the spare line rope tensioning device of claim 12 is characterized in that a pair of clamping and biasing guide rollers are provided on both sides of the overhead wire located in the center of the front-to-rear direction of the traveling guide saddle of claims 2 and 3, and are biased so as to lightly clamp both side sides of the overhead wire in a direction in which the roller axes are perpendicular to the overhead wire.

[0021] The invention of the spare line rope tensioning device of claim 13 is characterized in that the pair of clamping and urging guide rollers of claim 12 are rotatably supported at the upper and lower ends of each roller shaft via support arms on the car body frame so that they can rotate and press against both side sides of the overhead wire, and the upper shaft ends of both rollers are connected by a spring.

[0022] The invention of the spare wire rope tensioning device of claim 14 is characterized in that the pair of clamping and urging guide rollers of claim 12 are supported on the car body frame at the upper and lower ends of each roller shaft via springs so that they contact the side of the overhead wire from a direction perpendicular to the side.

[0023] The invention of the spare wire rope tensioning device of claim 15 is characterized in that guide disks for preventing the overhead wire from coming off the wheel circumferential surface are provided on both side surfaces of at least a pair of front and rear wheels of claims 2 and 3, and a central guide mechanism is provided on both opposing inner surfaces of the guide disks of each wheel for guiding the overhead wire that intrudes into the wheel circumferential surface side relatively in accordance with the rotation of the wheel to the center of the wheel circumferential surface while contacting both side surfaces of the overhead wire.

[0024] The invention of the spare line rope tensioning device of claim 16 is characterized in that the central guide mechanism of claim 15 is arranged with a plurality of elastic rod-like members of a roughly "U" shape spaced apart in the circumferential direction on several opposing radial lines on both opposing inner surfaces of the guide disk, with both ends of the "U" shape standing upright in point contact with the disk surface.

[0025] The invention of the spare line rope tensioning device of claim 17 is characterized in that the elastic rod-shaped member of claim 16 has one end of the "H" character pivotally attached to the outer edge side of the disk so as to be able to swing freely, and the other end of the "H" character obliquely passing through a through hole in the disk surface on the wheel circumferential side.

[0026] The invention of the spare line rope tensioning device of claim 18 is characterized in that the rope locking device of claims 1 to 17 is composed of a locking hole drilled in the body frame and a ring body in which a part of the ring is configured to be openable and closable so as to be able to engage and detachably with the locking hole.

[0027] The invention of a spare line rope tensioning device according to claim 19 is characterized in that it comprises at least three sets of the rope anchoring devices according to claims 1 to 18.

[0028] The invention of a spare line rope tensioning device according to claim 20 is characterized in that the pair of wheels according to claims 1 to 19 are provided with irregularities on the circumferential surface of the wheels to increase the coefficient of friction with the overhead wire.

[0029] The invention of claim 21 of the spare line rope tensioning device is characterized in that the wheels of claims 1 to 19 are tires.

[0030] The invention of the spare line rope tensioning device of claim 22 is characterized in that the fastening device of claims 1 to 21 is a carabiner.

[0031] The invention of claim 23 of the spare line rope tensioning device is characterized in that the traveling vehicle body and the transmitter / receiver of claims 1 to 22 are radio control systems.

[0032] The invention of the spare line rope tensioning device of claim 24 is characterized in that the rope locking device of claims 1 to 23 is composed of a locking hole drilled in the body frame and a ring body that can be freely engaged and disengaged with the locking hole.

[0033] The invention of the spare line rope tensioning method of claim 25 is a method of tensioning a spare line rope using a spare line tensioning device equipped with a traveling vehicle body that can freely travel along a single overhead line already stretched between overhead line supports and a transceiver that freely controls the traveling vehicle body by remote control, First, the running vehicle body is suspended so as to be freely engaged and disengaged from an appropriate overhead line between the overhead line supports where the line is to be extended; Next, the tip of the spare line rope is detachably fastened to the running vehicle body via an appropriate feeding means such as a pulley disposed on one of the overhead line supports between the overhead line supports, A method for stretching a spare line rope, characterized in that the spare line rope is stretched between the overhead line supports by remotely controlling the traveling vehicle body to travel to the other overhead line support by the transmitter.

[0034] The invention of a spare line rope tensioning method of claim 26 is characterized in that the spare line rope tensioning device of claim 25 is the spare line rope tensioning device according to any one of claims 1 to 24. [Effects of the Invention]

[0035] According to the devices and methods of the present invention as set forth in claims 1 to 26, a backup line rope can be quickly and easily stretched between the overhead line supports at a desired height by remote control using a transmitter from the ground, regardless of the presence or absence of obstacles such as branch lines branching off from the main line located at a relatively low position between the overhead line supports, such as between telegraph poles, thereby making the work of erecting the overhead line between the overhead line supports significantly more efficient than before.

[0036] According to each of the inventions of claims 2 to 25, the running guide saddle section, which extends in the same direction as the extension direction of the overhead wire, is parallel to the left and right sides of the overhead wire, so that the traveling direction of the running vehicle body can be aligned with the extension direction of the overhead wire, and the running trajectory of the pair of front and rear wheels riding on the overhead wire can be more reliably maintained. In addition, the downward extending weight portions that extend downward from both the left and right sides of the running guide saddle portion that straddles the overhead wire, with the overhead wire at the center, constantly press the pair of front and rear wheels down on the overhead wire from above, increasing the degree of pressure between the wheels and the overhead wire, thereby increasing the tractive force of the running vehicle body on the overhead wire and reducing the possibility of the wheels coming off the overhead wire. Furthermore, by using a pair of front and rear wheels as drive wheels via gears, the running and traction functions can be further improved.

[0037] According to the inventions of claims 3 to 25, when the balanced layout design of the vehicle body components is carried out at the design stage of the device in order to balance the left and right sides of the traveling vehicle body, even if an imbalance occurs, the balance can be easily maintained by applying a supplementary weight of the required weight to maintain the balance, so that the design and production can be carried out relatively freely and easily without being forced to bear the burden of precision design.

[0038] According to the inventions of claims 4 to 25, by making the distance between the opposing inner surfaces of the running guide saddle portion and the downward hanging extension portion larger than the diameter of the enlarged diameter connection portion of the overhead wire, the device and method of the present invention can be used even for overhead wires that have connection parts with a diameter larger than that of the overhead wire, and the device can be used without having to consider the presence or absence of connection parts with an enlarged diameter, etc.

[0039] According to the invention of claim 5, even if the vehicle body traveling on the overhead wire sways slightly from side to side, the presence of the return surface portion returns the traveling direction of the vehicle body to match the extending direction of the overhead wire, thereby enabling the vehicle body to travel smoothly without getting caught on the side of the overhead wire. Furthermore, even if there is a connection part where the diameter of the connection part is somewhat larger than the diameter of the overhead wire at the connection enlarged diameter section, etc., as long as the distance between the two reverse surface sections is larger than the diameter of the connection part, the large-diameter connection part can pass through smoothly without any problems.

[0040] According to the invention of claim 6, the wind holes provided on the side of the downwardly extending weight portion reduce the wind pressure of crosswinds on the running vehicle body, allowing the device to run smoothly and stably at relatively high altitudes.

[0041] According to the inventions of claims 7 to 11, the guide disc not only makes it difficult for the pair of front and rear wheels to come off the overhead wire in the left-right direction, preventing them from getting off the overhead wire, but also prevents the front and rear wheels from getting off the overhead wire, so that the running posture of the running vehicle body can be more reliably aligned with the extension direction of the overhead wire, thereby maintaining smooth and stable running.

[0042] According to the inventions of claims 8 to 11, the distance between the left and right guide discs gradually widens toward the outer edges of the discs, so that the device and method of the present invention can be used even for overhead wires that have connection points with a diameter larger than that of the overhead wire.

[0043] According to the inventions of claims 12 to 14, the device and method of the present invention can be used for a wide variety of overhead wires with a wide range of diameters, regardless of the diameter of the overhead wire or the diameter of the connection portion of the overhead wire.

[0044] According to the inventions of claims 15 to 17, the overhead wire is constantly clamped by the elastic rod-like members of the central guide mechanism provided on the inner surface of the guide disk, i.e., the elastic rod-like members are provided in large numbers in the circumferential direction of the disk at intervals along radial lines centered on the axis of the disk, which constantly clamp the overhead wire from both sides of the wire facing each other, so that not only is it difficult for the pair of front and rear wheels to come off the overhead wire in the left-right direction, preventing them from getting off the overhead wire, but also preventing the front and rear wheels from getting off the overhead wire, so that the running posture of the running vehicle body naturally matches the extending direction of the overhead wire, thereby maintaining smooth and stable running.

[0045] According to the invention of claim 18, no special rope fastening device is required, and the device can be produced using a hole simply provided at an appropriate position on the vehicle body and a ring that can be easily attached and detached to the hole, such as a commercially available carabiner, which is a relatively inexpensive and easily available part.

[0046] According to the invention of claim 19, in the field of electric wire equipment, the device of the present invention can be suspended from an appropriate one of three high-voltage wires that are normally installed above three low-voltage wires on a telephone pole, and three spare wire ropes can be used simultaneously to simultaneously tension the three low-voltage wires located below, thereby making the work more efficient.

[0047] According to the inventions of claims 20 and 21, the coefficient of friction of at least one pair of front and rear wheels is increased, and the traction function of the running vehicle, i.e., the spare line rope of the device, can be improved.

[0048] According to the invention of claim 22, it can be made using a commercially available carabiner that is relatively inexpensive and easy to obtain.

[0049] According to the invention of claim 23, the device can be configured relatively easily using existing radio control system technology. [Brief explanation of the drawings]

[0050] [Figure 1] FIG. 1 is a perspective view of a backup wire rope tensioning device according to a first embodiment. [Figure 2] FIG. 2 is a right side view of the spare line rope tensioning device of the first embodiment. [Figure 3] FIG. 3 is a perspective view of a frame of the backup wire rope tensioning device of the first embodiment. [Figure 4] FIG. 4 is a plan view of a frame of the backup wire rope tensioning device of the first embodiment. [Figure 5] FIG. 5 is a perspective view of a wheel of a spare line rope tensioning device according to a second embodiment. [Figure 6] FIG. 6 is a vertical cross-sectional view of a frame provided with wheels of a spare line rope tensioning device of the second embodiment. [Figure 7] FIG. 7 is a plan view of a spare wire rope tensioning device according to a second embodiment. [Figure 8] FIG. 8 is a side view of a spare wire rope tensioning device according to a third embodiment. [Figure 9] FIG. 9 is a plan view of a spare wire rope tensioning device according to a third embodiment. [Figure 10] FIG. 10 is a plan view showing another example of a clamping and biasing guide roller of the spare wire rope tensioning device of the third embodiment. [Figure 11] FIG. 11 is a vertical cross-sectional view of a wheel of a spare line rope tensioning device according to a fourth embodiment. [Figure 12] FIG. 12 is an enlarged cross-sectional view of a portion of the wheel shown in FIG. [Figure 13] FIG. 13 is a side view of a wheel of a spare line rope tensioning device according to a fourth embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

[0051] Hereinafter, Examples 1 to 4 as the best mode for carrying out the present invention will be described with reference to FIGS. Example 1

[0052] First, a first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the spare line rope tensioning device, FIG. 2 is a right side view thereof, FIG. 3 is a perspective view of the car body frame, and FIG. 4 is a plan view of the car body frame. 1 shows a preliminary rope tensioning device 2 (hereinafter simply referred to as tensioning device 2) of the present invention attached to an existing cable-type electric wire (hereinafter also referred to as cable electric wire) shown in phantom lines as an overhead wire 1 stretched between telephone poles (not shown), which are an example of overhead wire supports not shown. Reference numeral 12 in the figure is the connection part of the cable electric wire 1, and indicates the expanded diameter connection part in which the diameter of the electric wire 1 is expanded by about two times.

[0053] The preliminary rope tensioning device 2 of the present invention is equipped with a traveling vehicle body 21 that travels freely between the overhead line supports along a single existing overhead line 1 stretched between the overhead line supports, and a transceiver (not shown) that remotely controls this traveling vehicle body 21. The illustrated running vehicle body 21 has at least a pair of front and rear wheels 22, 22 that ride on the upper surface of the overhead wire 1, a running guide saddle portion 23 that is supported by this pair of wheels 22, 22 and straddles the overhead wire 1, facing parallel to both side sides of the overhead wire 1 and extending parallel to the direction in which the overhead wire 1 extends, and a body frame 25 that has downward hanging extension weight portions 24, 24 that extend further downward in parallel from the lower left and right ends of this running guide saddle portion 23 and also function as a weight to maintain the left and right balance of the running vehicle body 21.

[0054] In Figures 1 and 2, the body frame 25 is provided with the necessary components required for traveling, such as the required traveling body components 26 including at least a battery, a motor, a wheel drive mechanism for driving a pair of wheels, and a receiver for receiving an operating signal from a transmitter. The arrangement of the necessary components that make up the running body structure 26 and the structure and configuration of the running body 21 must naturally be designed so that the pair of front and rear wheels 22, 22 rides in a balanced manner across a single overhead wire (electric wire) 1, enabling stable running, and so that the left and right weight balance of the running body 2 riding on the overhead wire 1 is maintained.

[0055] In this embodiment, even if a slight difference occurs in the left and right weight balance, a supplementary weight mounting portion 28 is provided on either the left or right or one of the downward hanging extension weight portions 24 to which a supplementary weight 27 necessary to maintain balance can be detachably attached as needed. This greatly reduces the design work for precise weight balance and allows for relatively free design.

[0056] 3 and 4, the body frame 25 of this embodiment has a top surface of the running guide saddle section 23, which has an inverted U-shaped cross section and is shaped to straddle the overhead wire 1 in a saddle-like manner, extending horizontally toward the back of the page and also extending horizontally in the direction of extension of the overhead wire 1 to form an arrangement surface 29 that is formed into a roughly rectangular plane overall, on which various components that make up the running body structure 26, such as a battery, a motor, a wheel drive mechanism that drives a pair of wheels 22, 22, and a receiver, are arranged (FIGS. 1 and 2).

[0057] For this reason, in order to correspond to the total weight of these arrangement surfaces 29 and the components that make up the running vehicle body component 26, i.e., in order to achieve weight balance, the downward extending weight portion 24 on the front side of the paper is formed larger in size in plan than the downward extending weight portion 24 on the back side of the paper, and a supplementary weight mounting portion 28 is provided on the lower side of the downward extending weight portion 24 on the front side of the paper to which a supplementary weight 27 of the required weight necessary to achieve weight balance can be attached and detached as needed.

[0058] 1, reference numerals 43 and 44 denote anti-slip devices, which are safety devices that prevent the spare line rope tensioning device 2 attached to the overhead wire 1 from derailing and falling from the overhead wire 1. The anti-slip device as a safety device shown in the figure has one pipe 43 hung across the relative space between the opposing downward hanging extension weights 24, 24 that straddle the overhead wire 1 via the running guide saddle 23, and the pipe 43 is detachably attached to the downward hanging extension weights 24, 24 with bolts 44. In this way, the spare line rope tensioning device 2 is mounted so as to travel on the overhead line 1 while enclosing the overhead line 1 with the travel guide saddle portion 23, the pair of opposing downward hanging extension weight portions 24, 24, and the pipe 43 of the fall prevention device. This can prevent accidents such as the device falling to the ground.

[0059] Of course, the fall prevention device as a safety device to prevent falling is not limited to the example shown above, and any means can be used to prevent the spare line rope tensioning device 2 from detaching from the overhead wire 1 even if it derails from the overhead wire 1. Furthermore, when using such a fall prevention means as a safety device that prevents the device 2 from detaching from the overhead wire 1 even if it derails from the overhead wire 1, it is naturally necessary to lock and unlock the fall prevention means when attaching or detaching the device 2 to or from the overhead wire 1. In the case of this embodiment, the device 2 can be attached to and detached from the overhead wire 1 by loosening the bolts 44 and removing the pipe 43 between the opposing downward hanging extension weight portions 24, 24.

[0060] The spare line rope tensioning device 2 of the present invention is a device for pulling an overhead line (not shown), i.e., a cable electric wire in this embodiment, to be newly tensioned between the overhead line supports, by riding on an existing cable electric wire 1 (overhead line 1) and running along the cable electric wire 1, while pulling it out and towing it between the overhead line supports via a spare rope (not shown), and therefore requires a suitable frictional force to generate a traction force between the existing cable electric wire 1 and the cable electric wire so that it does not spin freely while riding on the existing cable electric wire 1, and therefore requires a suitable weight. For this reason, the body frame 25 is preferably made of a material with a large specific gravity, such as metal or resin. For the same reason, the wheels 22 in the embodiment are rubber tires having irregularities on the outer circumferential surface of the wheels to increase the coefficient of friction with the overhead wire 1, but the present invention is not limited to this.

[0061] 1 and 2, the overhead wires 1 are shown with enlarged diameter connection portions 12 where the cable diameter is enlarged as connection portions, i.e., connection portions, that connect the overhead wires 1 together, but because these enlarged diameter connection portions 12 appear at connection portions of long cables, they do not appear very often between overhead wire supports such as steel towers that are shorter than the length of the cables, particularly between telegraph poles as shown in this embodiment, but Examples 1 to 4 show an example of a spare wire rope tensioning device 2 that assumes the existence of the enlarged diameter connection portions 12. That is, in the running guide saddle portion 23 and the downward hanging extension weight portions 24, 24, the relative distance between the two inner surfaces facing each other with the overhead wire 1 in the center is larger than the diameter of the enlarged diameter connection portion 12 where the connection portion of the overhead wire 1 is enlarged, so that the running vehicle body 21 can pass through the enlarged diameter connection portion 12 without hindrance (see FIG. 11).

[0062] However, the present invention is not limited to the configuration shown in the above embodiment, and includes a configuration of a spare line rope tensioning device that does not assume the existence of the enlarged diameter connection portion 12, that is, a configuration in which the relative distance between the inner surfaces of the running guide saddle portion 23 and the downward hanging extension weight portions 24, 24, which face each other with the overhead wire 1 at the center, is equal to the diameter of the overhead wire 1, allowing the running car body 21 to run. This configuration is not shown, but can be easily imagined from the illustrated example.

[0063] In the figures of Examples 1 to 4, which assume the presence of the enlarged diameter connection portion 12, a reverse surface portion 30 is provided on both end edges of the running guide saddle portion 23, which face each other with the overhead wire 1 on the front-to-rear side of the running guide saddle portion 23 at the center, and the relative distance between the both end edges gradually increases outward. By providing this reverse surface portion 30, when the traveling guide saddle portion 23 passes through the connecting enlarged diameter portion 12, the connecting enlarged diameter portion 12 is smoothly swallowed up between both end edges of the traveling guide saddle portion 23 without any hindrance, thereby realizing a smooth running.

[0064] In Figures 1 to 3, the symbols 31, 31 in the figures indicate air holes that reduce crosswind pressure and are provided in the centers of both downwardly extending weight sections 24, 24, which are shaped to hang down parallel to the left and right lower edge sides of the travel guide saddle section 23 and are also formed into a flat shape, so as to communicate with each other. This is provided on the downwardly extending weight portions 24, 24 in this embodiment, which are formed in a flat shape to allow wind pressure to escape so that the spare rope tensioning device 2, which runs at a relatively high altitude, does not sway when hit by crosswinds.Therefore, it is not necessarily necessary if, for example, the downwardly extending weight portion 24 is not flat but has a frame-like structure that is less susceptible to wind pressure. Furthermore, although the illustrated air holes 31 are provided in both downwardly extending weight portions 24, if the vehicle body frame 25 is designed to have only one vertically extending weight portion 24, the air holes 31 will be provided in that one downwardly extending weight portion 24. Furthermore, the air holes 31 may be provided not only in the downward extending weight portion 24 but also in a shape that extends to the travel guide saddle portion 23, either of which is up to the design. In addition, if only one of the planar downward extending weight portions 24 is provided on either the left or right side in terms of weight balance design, it will be provided on only that one side.

[0065] 1 and 2, the reference numeral 40 in Fig. 2 denotes a rope fastening device provided on the body frame 25 of the traveling body 21, and is a fastening device to which the tip of a spare line rope (not shown) is detachably fastened. In the example shown, it is composed of three fastening holes 41, 41, 41 drilled in the body frame 25 and three ring bodies 42, 42, 42, each of which has a portion of the ring configured to be able to be opened and closed so as to be detachably engaged with the three fastening holes 41, respectively.

[0066] In this embodiment, since the device 2 is a spare line rope tensioning device used between utility poles in the field of electric wire installation, the device 2 of the present invention is suspended from an appropriate one of the three high-voltage wires that are normally installed above the three low-voltage wires that are installed between utility poles, and is configured to include three sets of rope fastening devices so that the three spare line ropes can be used simultaneously to tension the three low-voltage wires located below. Furthermore, a carabiner, which is widely available in general, is inexpensive and ideal as the ring body 42 of such a rope fastening device 40.

[0067] The transmitter / receiver that remotely controls the traveling body 21 of the preliminary rope tensioning device 2 of the present invention from the ground is not a special system but a well-known radio control system, but of course the device of the present invention is not limited to this and any commonly used transmitter / receiver system that can be remotely controlled will do. The traveling body 21 of this embodiment is a device that can be used as a traveling body of a radio control system as is, except for the frame. Example 2

[0068] The second embodiment will be described below with reference to FIGS. The preliminary rope tensioning device of Example 2 differs from the configuration of Example 1 in that, among the configurations of the preliminary rope tensioning device 2 of Example 1, the device is provided with guide discs 50 on both sides of each pair of front and rear wheels 22, 22 to prevent the overhead wire 1 from coming off the periphery of the wheels 22; otherwise, the configuration is the same as that of Example 1.

[0069] Therefore, the following description will be given of the spare line rope tensioning device of the second embodiment using one wheel 22 of the pair of front and rear wheels 22, 22 as an example, and a description of the configuration common to the first embodiment will be omitted. Fig. 5 is a perspective view of a wheel of the spare line rope tensioning device of the second embodiment, Fig. 6 is a vertical cross-sectional view of a frame provided with the wheel of the spare line rope tensioning device of the second embodiment, and Fig. 7 is a plan view of the spare line rope tensioning device of the second embodiment. Note that, among the reference numerals in the figures, the same reference numerals as those in the first embodiment have the same meaning.

[0070] 5 to 7 are disks with a diameter larger than that of the wheel 22, attached to both side surfaces in the width direction of the circumferential surface of the wheel 22, i.e., attached to both side surfaces of the wheel 22 so as to sandwich the wheel 22. The illustrated guide disks 50 are annular in shape, but are not limited to annular shapes.

[0071] 5 and 6 are shown as being curved in shape such that the relative distance between the inner surfaces of the opposing disks 50 gradually increases in a curved line from the wheel axle 51 side toward the wheel outer edge side, but the disk shape is not limited to this, and the relative distance between the inner surfaces of the opposing disks 50 may also be in a shape such that the relative distance between the inner surfaces of the opposing disks 50 gradually increases in a linear line from the wheel axle 51 side toward the wheel outer edge side, as shown in Fig. 7. In short, the disk shape of the guide disk 50 may be any shape that can prevent the overhead wire 1 from coming off the circumferential surface of the wheel 22. Example 3

[0072] The third embodiment will be described below with reference to FIGS. The primary rope tensioning device of Example 3 also differs from the configuration of Example 1 in that, in the configuration of the primary rope tensioning device 2 of Example 1, a pair of clamping and biasing guide rollers 60, 60 are provided which are biased so as to lightly pinch both side surfaces of the overhead wire 1 in a direction in which the roller shaft 61 is perpendicular to the overhead wire 1, but the other configurations are the same as those of Example 1. Therefore, a description of the configurations common to Example 1 will be omitted. FIG. 8 is a side view of a spare wire rope tensioning device of the third embodiment, FIG. 9 is a plan view of the spare wire rope tensioning device of the third embodiment, and FIG. 10 is a plan view of a spare wire rope tensioning device of the embodiment showing another clamping and biasing guide roller different from those shown in FIGS. 8 and 9.

[0073] In Figures 8 and 9, the clamping pressure guide rollers 60 are located on both sides of the overhead wire 1 so as to clamp the overhead wire 1 from the left and right in the front-to-rear direction of the running guide saddle portion 23, i.e., in the extension direction of the overhead wire 1, and are arranged so that the roller shafts 61 apply a light clamping force to both side sides of the overhead wire 1 in a direction perpendicular to the overhead wire 1. That is, the spare line rope tensioning device of the third embodiment is provided with clamping and biasing guide rollers 60, 60 in place of the pair of inverted surface portions 30, 30 provided on both end edges of the running guide saddle portion 23 of the spare line rope tensioning device 2 of the first embodiment, facing each other with the overhead wire 1 in the center, on both front and rear sides of the running guide saddle portion 23.

[0074] The roller shafts 61 of a pair of clamping and urging guide rollers 60, 60 that clamp the overhead wire 1 are axially attached to the frame body 25 of the running vehicle body 21 via a swivel support arm 62 so that they can freely rotate toward and away from the side of the overhead wire 1 depending on the diameter of the overhead wire 1 and the diameter of the connection enlarged diameter section 12, and the upper end sides of the opposing roller shafts 61, 61 are connected by a spring 63 so as to clamp the overhead wire 1. Therefore, when attaching the spare wire rope tensioning device of this embodiment 3 to the overhead wire 1, the space between the pair of front and rear roller shafts 61, 61 is manually opened against the clamping pressure of the pair of roller shafts 61, 61, and the device is attached so that it straddles the overhead wire 1 from the lower side of both roller shafts 61, 61.

[0075] Figure 10 shows an example of a clamping pressure urging guide roller 70 different from the clamping pressure urging guide roller 60 shown in Figures 8 and 9, in which springs 72, 72, 72, 72, one end of which is engaged with the frame body 25 of the traveling vehicle body 21, are attached to each of the shaft ends on both upper and lower ends of roller shafts 71, 71 so that the roller shaft 71 clamps both side sides of the overhead wire 1. Therefore, when attaching the spare wire rope tensioning device of Example 3 equipped with this clamping pressure-driven guide roller 70 to the overhead wire 1, the space between the pair of front and rear roller shafts 71, 71 must be manually opened against the clamping pressure of the pair of roller shafts 71, 71, and the device must be attached so that it straddles the overhead wire 1 from the lower side of both roller shafts 71, 71.

[0076] According to the spare wire rope tensioning device of Example 3 shown in Figures 8 to 10, which is equipped with the clamping and urging guide rollers 60 and 70 shown in Example 3, the device runs on the overhead wire 1 while straddling the same via a pair of wheels 22, 22, and therefore always runs while clamping the overhead wire 1 from both sides of the overhead wire 1, thereby significantly improving the stability of the device when running. Furthermore, since the device travels along the overhead wire 1 and the parts that come into contact with the overhead wire 1 are the rotating wheels 22 and rollers, the degree of damage to the overhead wire 1 can be significantly reduced. Example 4

[0077] Finally, a spare wire rope tensioning device according to a fourth embodiment will be described with reference to Figures 11 to 13. Figure 11 is a longitudinal cross-sectional view of a wheel, Figure 12 is an enlarged partial view of Figure 11, and Figure 13 is a side view of the wheel with the elastic rod-shaped member removed. The spare wire rope tensioning device of Example 4 differs from the configuration of Example 1 only in that, among the device configuration of the spare wire rope tensioning device 2 of Example 1, it is a device in which guide discs 80 different from the guide discs 50 of Example 2 are provided on both side surfaces of each of a pair of front and rear wheels 22, 22, but the other configurations are the same as those of Example 1. Therefore, hereinafter, for the spare wire rope tensioning device of Example 4, only the configuration of the guide discs 80 which is different from that of the spare wire rope tensioning device 2 of Example 1 will be described, and other descriptions will be omitted.

[0078] 11 to 13, the invention of the spare wire rope tensioning device of embodiment 4 is a device in which guide discs 80, 80 for preventing the overhead wire 1 from coming off the circumferential surface of the wheels are provided on both side surfaces of each pair of front and rear wheels 22, 22 (FIGS. 1 to 4), as discs with a diameter larger than that of the wheels 22, and on the inner surfaces of each wheel 22, 22 facing each other, a central guide mechanism 81 is provided for guiding the overhead wire 1 which intrudes into the circumferential surface of the wheel 22 in an attempt to come into contact with the circumferential surface of the wheel 22 in accordance with the rotational movement of the running wheel 22, while coming into contact with the left and right side surfaces of the overhead wire 1, toward the circumferential surface of the wheel 22, i.e., the center of the wheel circumferential surface.

[0079] The central guide mechanism 81 is formed by a number of elastic rod-like members 82 formed into an approximately "U" shape, which are arranged radially at appropriate intervals around the circumference of the disks 80, 80 on several radial lines extending radially from an imaginary center of the disks on the inner surfaces of the opposing guide disks 80, 80, with both ends of the "U" shape (symbols 83 and 84 in the figure) standing upright as if they were in point contact with the inner surface of the guide disk 80.

[0080] The radially arranged elastic rod-like members 80 are pivotally attached to the surface of the disk 80 at the outer edge side (outside) of the disk 80, which is one end of the character "へ", i.e., the outer end 83 side of the character "へ", so as to be able to swing freely, and the other end of the character "へ", i.e., the inner end 84 side of the center side of the disk 80, which is the circumferential surface side of the wheel 22 (wheel circumferential surface), is provided in a state in which a through hole 85 serving as an escape hole for the disk 80 penetrates in an oblique direction according to the bending angle of the character "へ".

[0081] In Figures 11 and 12, the pair of opposing "V"-shaped elastic rod-like members 82, 82 located on the left and right above the wheels 22 are in a state in which the overhead wire 1 has not yet relatively intruded into them in response to the rotation of the wheels 22 while the vehicle is running, while the pair of opposing "V"-shaped elastic rod-like members 82, 82 located on the left and right below the wheels 22 are in a state in which the overhead wire 1 or the connection enlarged diameter portion 12 of the overhead wire 1 (these are collectively referred to as "overhead wire") has relatively intruded into them in response to the rotation of the wheels 22 while the vehicle is running.

[0082] As shown in the figure, when there is no intrusion of the overhead wire 1 (upper side of the figure), the pair of elastic rod-like members 82, 82 are constantly urged by the elastic force of the elastic rod-like members 8 themselves so that the tops of the bent "V" shape are close to each other. However, when the overhead wire 1 intrudes (lower side of the figure), the overhead wire 1 intrudes between the pair of elastic rod-like members 82, 82, and the tops of the bent "V" shape move away from each other due to the relative pressure of the intruding overhead wire 1 (actually the weight pressure of this device 2 itself), and finally, as shown in Figure 12, the overhead wire 1 comes into contact with the wheel surface with its sides sandwiched between the left and right elastic rod-like members 82, 82.

[0083] In this way, the wheel 22 is clamped in the widthwise center of the wheel circumferential surface, embracing the overhead wire 1 from three sides (top, bottom, left and right), so that not only can the spare line rope tensioning device of this embodiment 4 prevent the wheel 22 from derailing from the overhead wire 1, but also enables the running vehicle body 21 to run stably.

[0084] The method of tensioning a spare line rope using the spare line rope tensioning device 2 of the above-mentioned Examples 1 to 4, that is, using the spare line rope tensioning device of the present invention (hereinafter also referred to as this device 2) which is equipped with a running vehicle body that can freely run along a single existing overhead line 1 that has already been stretched between overhead line supports such as electric wires, and a transmitter / receiver that freely controls the running vehicle body by remote control, is as follows.

[0085] First, the running body 21 of this device 2 is suspended so as to be freely engaged and disengaged from a suitable existing overhead line located between overhead line supports such as telegraph poles where an overhead line such as an electric wire is planned to be laid, and a pair of front and rear wheels 22, 22 are placed in a state in which they can run on the overhead line 1, and are made to wait on the side of the overhead line support from which the line is to be laid. Next, with the tip of the new overhead wire to be used for extension connected to the rear end of the rope by appropriate means, the tip of the rope, i.e., the spare line rope, is detachably fastened to the main device 2 via a rope fastener on the running body 21 of the main device 2 via an appropriate feeding means such as a pulley arranged on the overhead line support at the extension source. The above work is performed by a worker.

[0086] Next, the traveling vehicle body 21 of the device 2 is remotely controlled by a worker using a transmitter from an appropriate remote location such as the ground, and travels to the other overhead line support where the wire is to be extended. The running body of this device 2 carries, i.e., tows, the spare line rope and delivers it to the overhead line supports to which it is to be extended, along the existing overhead line that is strung between the overhead line supports, moving through the air, rather than on the ground, between the overhead line supports. After the worker removes the tip of the spare line rope that has been delivered to the overhead line support side of the extension destination from the running body of this device 2, they use a method that is almost the same as conventional, that is, they pull out the overhead line for extension to the hand side, i.e., the overhead line support side of the extension destination, via the spare line rope, and stretch a new overhead line between the overhead line supports.

[0087] According to the method of tensioning a spare line rope using the spare line rope tensioning device of the present invention, the spare line rope can be moved through the air along the existing overhead wire in the air, rather than being dragged across the ground to the destination as in the past.Therefore, regardless of the presence or absence of obstacles below the overhead line on which the device is running, such as obstacles such as branch wires from the main line located at a relatively low level between the overhead line supports or obstacles on the ground, the spare line rope can be tensioned extremely quickly and easily between the overhead line supports at the desired height, by remote control using a transmitter from the ground, and the efficiency of overhead line erection work can be made significantly greater than in the past. [Industrial Applicability]

[0088] The present invention is not limited to the work of erecting a backup wire rope for an electric wire, but can be widely used not only for the erection of leading ropes and the like in the erection of an overhead wire, but also for the erection of the overhead wire itself. [Explanation of symbols]

[0089] 1. Overhead lines 12 Enlarged diameter connection part (overhead line) 2. Spare wire rope tensioning device 21 Running vehicle 22 Wheels (Traveling body) 23 Travel guide saddle (traveling body) 24 Downward hanging extension part (traveling body) 25 Body frame (running body) 26 Running body component (running body) 27 Replacement weight (running body) 28 Supplementary weight mounting part (traveling body) 29 Layout surface (traveling vehicle body) 30 Reverse surface (body frame) 31 Air hole (body frame) 40 Rope fastener 41 Locking hole (rope locking device) 42 Ring (rope fastener) 43 Pipe (fall prevention device) 44 Bolt (anti-fall device) 50 Guide disc (Example 2) 51 Wheel axle (wheel) 60 First clamping and urging guide roller (Example 3) 61 Roller shaft (first clamping pressure biasing guide roller) 62 Swivel support arm (first clamping and biasing guide roller) 63 Spring (first clamping pressure biasing guide roller) 70 Second clamping and urging guide roller (Example 3) 71 Roller shaft (second clamping pressure biasing guide roller) 72 Spring (second clamping pressure biasing guide roller) 80 Guide disc (Example 4) 81 Central guide mechanism 82 Elastic rod-shaped member (central guide mechanism) 83 Outer end (elastic rod-shaped member) 84 Inner end (elastic rod-shaped member) 85 Through hole (central guide mechanism) End

Claims

1. a traveling vehicle body that travels freely between the overhead line supports along a single overhead line stretched between the overhead line supports, and a transceiver that remotely controls the traveling vehicle body; The spare line rope tensioning device is characterized in that the traveling vehicle body is provided with a rope fastening device for detachably fastening the tip of the spare line rope.

2. The traveling vehicle body of claim 1 comprises at least a pair of front and rear wheels that ride on an upper surface of an overhead wire, and a traveling guide saddle portion that is supported by the pair of wheels, straddles the overhead wire, and extends along the overhead wire facing both side sides of the overhead wire. a vehicle frame provided with a downwardly hanging weight portion extending downward from each lower end of the travel guide saddle portion and serving as a weight to maintain left and right balance of the traveling vehicle body;

3. The vehicle body frame of claim 2 is provided with a traveling vehicle body component including at least a battery, a motor, a wheel drive mechanism for driving a pair of wheels, and a receiver for receiving an operation signal from a transmitter, A spare line rope tensioning device characterized in that a supplementary weight mounting section, to which a supplementary weight necessary to maintain left and right balance of a running vehicle body can be detachably attached, is provided on either or both of the downward hanging extension weight sections.

4. 4. A spare wire rope tensioning device according to claim 2, wherein in the running guide saddle section and the downward hanging extension section, the relative distance between the inner surfaces of the two sections facing each other with the overhead wire at the center is greater than the enlarged diameter section where the connection portion of the overhead wire is enlarged, so that the running vehicle body can pass through the enlarged diameter section.

5. A spare wire rope tensioning device according to claims 2 and 3, characterized in that a reverse surface portion is provided on both opposite end edges of the travel guide saddle section in the front-rear direction, with the overhead wire being in the center, so that the relative spacing between the two edges gradually increases outward.

6. 4. A backup wire rope tensioning device according to claim 2, wherein air holes for reducing crosswind pressure are provided in both or either of the downward extending weight portions hanging down on both the left and right sides of the overhead wire.

7. 4. A spare wire rope tensioning device according to claim 2 or 3, characterized in that guide disks for preventing the overhead wire from coming off the wheel periphery are provided on both side surfaces of at least one pair of front and rear wheels.

8. 8. A spare wire rope tensioning device according to claim 7, wherein the guide disks on both sides of each wheel are shaped so that the relative distance between the inner surfaces of the opposing disks gradually increases from the wheel axle side toward the outer edge side of the wheel.

9. 9. A spare wire rope tensioning device according to claim 8, wherein the shape gradually expanding from the wheel axle side to the outer periphery side is a curved line shape.

10. 9. The spare wire rope tensioning device according to claim 8, wherein the shape gradually expanding from the wheel axle side toward the outer periphery side is linear.

11. 11. A backup wire rope tensioning device according to any one of claims 7 to 10, wherein the guide disk is annular.

12. A spare wire rope tensioning device characterized in that a pair of clamping and biasing guide rollers are provided on both sides of the overhead wire located at the center of the front-rear direction of the running guide saddle section of claims 2 and 3, and are biased so as to lightly clamp both side surfaces of the overhead wire in a direction in which the roller axes are perpendicular to the overhead wire.

13. A spare wire rope tensioning device according to claim 12, characterized in that the upper and lower ends of each roller shaft are rotatably supported on the car body frame via support arms so that the pair of clamping and urging guide rollers rotate and press against both side surfaces of the overhead wire, and the ends of the upper shafts of both rollers are connected by a spring.

14. A spare wire rope tensioning device according to claim 12, characterized in that the upper and lower ends of each roller shaft of the pair of clamping and urging guide rollers are supported by the car body frame via springs so as to contact the side of the overhead wire from a direction perpendicular to the roller shaft.

15. In claim 2 and claim 3, at least a pair of front and rear wheels are provided on both sides with guide disks to prevent the wheels from coming off the overhead wires from the wheel periphery, A spare wire rope tensioning device characterized in that a central guide mechanism is provided on both opposing inner surfaces of the guide disk of each wheel for relatively guiding the overhead wire that intrudes into the wheel circumferential surface side in accordance with the rotation of the wheel to the center of the wheel circumferential surface while contacting both side surfaces of the overhead wire.

16. The central guide mechanism of claim 15 is a spare wire rope tensioning device characterized in that a plurality of elastic rod-like members each having a substantially "U" shape are arranged at intervals in the circumferential direction on several opposing radial lines on both opposing inner surfaces of the guide disk, with both ends of the "U" shape standing upright in point contact with the disk surface.

17. The elastic rod-shaped member of claim 16 is characterized in that one end of the "U" character is pivotally attached to the outer edge side of the disk so as to be able to swing freely, and the other end of the "U" character is passed obliquely through a through-hole in the disk surface on the wheel circumferential surface side.

18. A spare line rope tensioning device according to any one of claims 1 to 17, characterized in that it is composed of a locking hole drilled in a vehicle body frame and a ring body having a portion of the ring that can be opened and closed freely so as to be able to be freely engaged with and detached from the locking hole.

19. A spare line rope tensioning device comprising at least three sets of the rope anchoring devices according to any one of claims 1 to 18.

20. A spare wire rope tensioning device according to any one of claims 1 to 19, wherein the pair of wheels are provided with irregularities on the circumferential surfaces of the wheels to increase the coefficient of friction with the overhead wire.

21. 20. A spare wire rope tensioning device according to claim 1, wherein the wheel is a tire.

22. A backup line rope tensioning device according to any one of claims 1 to 21, wherein the fastening device is a carabiner.

23. 23. A spare line rope tensioning device according to any one of claims 1 to 22, wherein the traveling vehicle body and the transmitter / receiver are a radio control system.

24. A spare line rope tensioning device according to any one of claims 1 to 23, characterized in that the rope fastening device is constituted by a fastening hole drilled in a body frame and a ring body that is releasably engaged with the fastening hole.

25. A spare line rope tensioning device is used, which is equipped with a traveling vehicle body that can freely travel along a single overhead line already stretched between overhead line supports and a transmitter / receiver that freely controls the traveling vehicle body by remote control. First, the running vehicle body is suspended so as to be freely engaged and disengaged from an appropriate overhead line between the overhead line supports where the line is to be extended; Next, the tip of the spare line rope is detachably fastened to the running vehicle body via an appropriate feeding means such as a pulley disposed on one of the overhead line supports between the overhead line supports, A method for stretching a spare line rope, characterized in that the spare line rope is stretched between the overhead line supports by remotely controlling the traveling vehicle body to travel to the other overhead line support by the transmitter.

26. A method for stretching a spare wire rope according to a twenty-fifth aspect of the present invention is characterized in that the spare wire rope stretching device is any one of the first to twenty-fourth aspects of the present invention.

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