JP7488530B2 - Cable installation method - Google Patents

Description

The present invention relates to a cable installation method used when installing a communication or power cable in a required section such as between utility poles.

Conventional cable installation methods require the suspension wire, spiral cable hanger, and communication or power cable to be installed between utility poles in that order, which is a very cumbersome task and requires a significant amount of work time. For this reason, the applicants have proposed a cable installation method as described in Patent Document 1.

JP 2018-033283 A

However, although the above cable installation method can significantly reduce work time and improve safety, it has the following problems:

In other words, when the weight of the three wires (suspension wire, spiral cable hanger, and communication or power cable) was added to the parent rope, the slack increased, which could have caused interference with other communication lines such as cable television. This could have led to a safety issue.

In addition, the cable installation method described above required the installation of metal casters between the utility poles, which could have made the work more complicated and reduced safety.

Furthermore, the cable installation method described above has the problem that it cannot be used in sections where suspension wires have already been installed, which can make the work more complicated and reduce safety.

In view of the above problems, the present invention aims to provide a cable installation method that can improve workability and safety.

The above object of the present invention is achieved by the following means. Note that the parentheses indicate reference symbols of the embodiments described below, but the present invention is not limited to these.

According to the invention of claim 1, a suspension wire (TL) installed in an installation section such as between utility poles (D1, D2, D3) is inserted from one end side to the other end side, and a traction line (traction rope KR) is attached to one end side (the third connecting part 20 side), and a towing tool (10) having a spiral cable hanger (HK) and a communication or power cable (KB) attached to the other end side (the first connecting part 14, the second connecting part 18 side) is towed by pulling the traction line (traction rope KR), and the spiral cable hanger (HK) and the communication or power cable (KB) are simultaneously installed in the installation section,
The towing tool (10) comprises:
A rotating part (13) that can rotate in a predetermined direction;
A connecting portion (first connecting portion 14) is provided on the rotating portion (13) so as to rotate together with the rotating portion (13),
The spiral cable hanger (HK) is rotatably connected to the connecting portion (first connecting portion 14) .

According to the invention of claim 2, in the cable installation method described in claim 1, the pulling tool (10) is characterized in that it has a hollow portion (first recess 11b, second recess 12b, hollow hole 13a, third recess 17b, through hole 19c) inside the pulling tool (10) so that the suspension wire (TL) can be inserted from one end side to the other end side, and has opening/closing parts (fourth opening/closing part 19d, third opening/closing part 17e, lid part 13c) that can close or open at least a part of the hollow portion (first recess 11b, second recess 12b, hollow hole 13a, third recess 17b, through hole 19c).

Next, the effects of the present invention will be explained using reference symbols in the drawings. Note that the reference symbols in parentheses are those of the embodiments described below, but the present invention is not limited to these.

According to the invention of claim 1, the suspended line (TL) is inserted from one end to the other end into the towing tool (10), the towing line (towing rope KR) is attached to one end (third connecting part 20 side) of the towing tool (10), and the spiral cable hanger (HK) and the communication or power cable (KB) are attached to the other end (first connecting part 14, second connecting part 18 side) of the towing tool (10). The towing tool (10) in this state is towed by pulling the towing line (towing rope KR), thereby simultaneously erecting the spiral cable hanger (HK) and the communication or power cable (KB) in the installation section between utility poles (D1, D2, D3, etc.).

The present invention therefore improves workability and safety.

According to the invention of claim 2, the towing tool (10) has a hollow portion (first recessed hole 11b, second recessed hole 12b, hollow hole 13a, third recessed hole 17b, through hole 19c) inside, and has opening/closing portions (fourth opening/closing portion 19d, third opening/closing portion 17e, lid portion 13c) that can close or open at least a portion of the hollow portion (first recessed hole 11b, second recessed hole 12b, hollow hole 13a, third recessed hole 17b, through hole 19c). This means that the towing tool (10) can be attached to the suspension line (TL) with the suspension line (TL) in a suspended state, thereby further improving workability and safety.

1A and 1B are schematic front views showing a method for installing a suspension wire between utility poles, and FIG. 1B is a schematic front view showing a method for extending a spiral cable hanger and a communication or power cable between utility poles, respectively, according to an embodiment of the present invention. FIG. 2 is a schematic front view showing the installation procedure of the cable installation method according to one embodiment of the present invention, illustrating the tensioning of the suspension wires installed between the utility poles and the method of fixing the spiral cable hanger to the utility pole. 3A is a plan view of the towing tool according to the embodiment, and FIG. 3B is a side view of the towing tool according to the embodiment. 3A is an end view taken along line ZZ of FIG. 3B, and FIG. 3B is a view of the fourth opening/closing unit shown in FIG. 3A when rotated. 3A is an end view taken along the line α-α shown in FIG. 3B, and FIG. 3B is a view illustrating only the portion related to the third fixing portion when the third opening/closing portion shown in FIG. 3A is rotated. 3A is a cross-sectional view taken along line XX in FIG. 3B, and FIG. 3B is a cross-sectional view taken along line YY in FIG. FIG. 11 is a side view showing a state in which a suspension wire is inserted into the towing tool of the same embodiment, a towing rope is connected to one end of the towing tool, and a spiral cable hanger and a communication or power cable are connected to the other end of the towing tool. 1A is a side view showing a state in which a suspension wire is inserted and a towing rope is connected to one end of the towing tool and a spiral cable hanger and a communication or power cable are connected to the other end of the towing tool, the towing tool being towed toward the metal cart; FIG. 1B is a side view showing a state in which the towing tool is about to pass through the metal cart; and FIG. 1C is a side view showing the state after the towing tool has passed through the metal cart.

One embodiment of the cable installation method according to the present invention will be specifically described below with reference to the drawings. In the following description, when directions such as up, down, left, and right are indicated, they refer to up, down, left, and right when viewed from the front of the illustration.

In the cable installation method according to this embodiment, when a spiral cable hanger and a communication or power cable are installed between utility poles, first, as shown in FIG. 1(a), a suspension line TL is installed between utility poles D1, D2, and D3 erected on the ground G at a fixed interval. At this time, as shown in FIG. 1(a), the start end TLa of the suspension line TL on utility pole D1 is held down using a suspension line band 3, and the end end TLb of the suspension line TL on utility pole D3 is held down using a suspension line band 3. Then, ropes R as shown in FIG. 8(b) and (c) are tied to each of utility poles D1, D2, and D3, and a metal wheel 1 is attached to the rope R and suspended. At this time, the suspension line TL is passed through the metal wheel 1 suspended from utility pole D2, and the middle part TLc of the suspension line TL is suspended by the metal wheel 1. If the suspension wire TL has already been stretched between the utility poles D1, D2, and D3, which are erected at regular intervals, the suspension wire band 3 of the utility pole D2 is temporarily removed, and the suspension wire TL is installed. Then, ropes R as shown in FIG. 8 are tied to each of the utility poles D1, D2, and D3, and the metal pulley 1 is attached to the ropes R and suspended, and the suspension wire TL is passed through the metal pulley 1 suspended from the utility pole D2.

Next, as shown in FIG. 1(b), the start end KRa (on the utility pole D3 side) of the towing rope KR is attached to a towing device 7 such as a shaft drive winch, and the end KRb is connected to one end of the towing tool 10. At this time, the towing rope KR is passed through the pulley 1 suspended from the utility poles D2 and D3.

Then, the spiral cable hanger HK and the communication or power cable KB are connected to the other end of the towing tool 10. That is, the straight coated steel wire DS, which is sent out in the direction of the arrow P1 from the straight coated steel wire drum 5 on the ground G and on which the long straight coated steel wire DS is wound, is pulled into the spiral cable hanger forming device 4 placed on a mounting table (not shown), and the spiral cable hanger HK, which is continuously formed and sent out while rotating in the direction of the arrow P3 from the spiral cable hanger forming device 4, and the communication or power cable KB, which is sent out in the direction of the arrow P1 from the cable drum 9 on the ground G and on which the long communication or power cable KB is wound, are connected to the other end of the towing tool 10 by the worker S riding on the gondola Ca of the aerial work vehicle C. As a result, the spiral cable hanger HK and the communication or power cable KB are connected to the other end of the towing tool 10.

This will be explained in more detail by explaining the structure of the towing tool 10.

As shown in FIG. 3(a), the towing tool 10 has a first fixing portion 11 that is trapezoidal in plan view. As shown in FIG. 3(a), this first fixing portion 11 has a first recess 11b in the middle of the upper surface portion 11a so as to be aligned with the axis O of the towing tool 10. As shown in FIG. 3(b), this first recess 11b is formed in a trapezoidal shape in side view and is provided from the tip end 11c toward the base end 11d. The suspension wire TL shown in FIG. 7 is inserted into this first recess 11b.

On the other hand, a rod-shaped second fixed part 12 having a smaller diameter than the outer diameter of the first fixed part 11 is integrally attached to the base end 11d of the first fixed part 11 so as to extend along the axis O. As shown in FIG. 3(a), the second fixed part 12 has a second recess 12b in the middle of the upper surface part 12a so as to extend along the axis O of the towing tool 10. As shown in FIG. 3(b), the second recess 12b is formed in a circular shape in a side view and is provided from the tip end 12c toward the base end 12d. The suspension wire TL shown in FIG. 7 is inserted into the second recess 12b, and the first recess 11b and the second recess 12b are connected to each other.

On the other hand, the outer peripheral surface of the tip 12c of the second fixed part 12 is provided with a circular rotating part 13 that can rotate in the direction of the arrow Y1 as shown in FIG. 3(a). As shown in FIG. 6(b), the rotating part 13 has a generally circular hollow hole 13a that penetrates the middle part in the width direction of the rotating part 13, and as shown in FIG. 3(a), a lid part 13c is provided on the upper surface part 13b of the rotating part 13. As shown in FIG. 6(b), the lid part 13c can open and close the hollow hole 13a, and can be attached to and detached from the rotating part 13 using a tool such as a hammer. The hollow hole 13a, the first recessed hole 11b, and the second recessed hole 12b are in communication with each other.

As shown in Fig. 6(b), a plurality of bearings 13e are provided along the circumferential direction on the inner peripheral portion 13d side of the rotating portion 13. These bearings 13e allow the rotating portion 13 to rotate smoothly when rotating around the outer peripheral surface of the tip portion 12c of the second fixed portion 12 in the direction of the arrow Y1 shown in Fig. 3(a).

In addition, when the rotating part 13 rotates in the direction of the arrow Y1 shown in FIG. 3(a), since the rotating part 13 is located on the base end 11d side of the first fixed part 11 as shown in FIG. 3(a), the rotation of the rotating part 13 may be hindered by contact with the base end 11d of the first fixed part 11. For this reason, as shown in FIG. 6(a), a plurality of bearings 11e are provided along the circumferential direction at the base end 11d of the first fixed part 11. This makes it possible to prevent the rotation of the rotating part 13 from being hindered by contact with the base end 11d of the first fixed part 11.

On the other hand, as shown in FIG. 3(b), a first connecting portion 14 is provided on the lower surface portion 13f side of the rotating portion 13. As shown in FIG. 3(b), this first connecting portion 14 is composed of a tilting portion 14A having a rectangular shape in a side view, and a gripping portion 14B that is rotatably fixed to one end portion 14Aa of the tilting portion 14A via a bolt 15.

The tilting part 14A is attached and fixed to a recessed groove 13g formed on the underside 13f of the rotating part 13 shown in FIG. 6(b), and the other end 14Ab of the tilting part 14A is fixed to the support shaft 16 shown in FIG. 3(b) so as to be tiltable. This allows the tilting part 14A to tilt in the direction of the arrow Y2 around the support shaft 16, as shown in FIG. 3(b), with the support shaft 16 as the base point.

As shown in FIG. 3(b), one end 14Ba of the gripping portion 14B is rotatably fixed to one end 14Aa of the tilting portion 14A via the bolt 15. This allows the gripping portion 14B to rotate around the bolt 15 in the direction of the arrow Y3, with the bolt 15 as the base point, as shown in FIG. 3(b). Furthermore, because the gripping portion 14B is fixed to the tilting portion 14A, when the tilting portion 14A tilts around the support shaft 16 in the direction of the arrow Y2, the gripping portion 14B also tilts accordingly, as shown in FIG. 3(b).

On the other hand, as shown in FIG. 3(b), the gripping portion 14B has an insertion hole 14Bb formed along the longitudinal direction into which the helical cable hanger HK can be inserted. As shown in FIG. 3(b), a plurality of bolts 14Bc (three in the figure) are provided on the underside of the gripping portion 14B, and each bolt 14Bc can enter the insertion hole 14Bb from a direction perpendicular to the longitudinal direction (the downward direction in the figure). That is, when inserting the helical cable hanger HK into the insertion hole 14Bb, first, each bolt 14Bc is loosened. As a result, the bolts 14Bc are not inserted into the insertion hole 14Bb, so that the helical cable hanger HK can be inserted into the insertion hole 14Bb as shown in FIG. 7. Then, when each bolt 14Bc is tightened, each bolt 14Bc enters the insertion hole 14Bb from a direction perpendicular to the longitudinal direction (downward in the figure) and presses the spiral cable hanger HK inserted in the insertion hole 14Bb. This prevents the spiral cable hanger HK from slipping out of the insertion hole 14Bb of the gripping portion 14B, and thus the spiral cable hanger HK is connected to the first connecting portion 14 as shown in FIG. 7.

On the other hand, as shown in FIG. 3(b), a third fixed portion 17 having a trapezoidal shape in a side view is attached integrally to the base end portion 12d of the second fixed portion 12. As shown in FIG. 3(a), the third fixed portion 17 has a third recess 17b in the middle of the upper surface portion 17a so as to be aligned with the axis O of the towing tool 10. As shown in FIG. 5(b), the third recess 17b is formed in a U-shape in a rear view and is provided from the tip end 17c toward the base end 17d. The suspension wire TL shown in FIG. 7 is inserted into the third recess 17b, and the first recess 11b, the second recess 12b, the hollow hole 13a, and the third recess 17b are connected to each other.

On the other hand, as shown in FIG. 3, the third opening/closing part 17e is provided on the upper surface part 17a side of the third fixing part 17 at the base end part 17d of the third fixing part 17. As shown in FIG. 5(b), the third opening/closing part 17e is formed in a semicircular arc shape, and is fixed to the base end part 17d of the third fixing part 17 by a pair of bolts 17e1 as shown in FIG. 5(a). Then, as shown in FIG. 5(b), by loosening one of the pair of bolts 17e1 (the bolt located on the left side in the figure), the third opening/closing part 17e rotates with the other bolt 17e1 (the bolt located on the right side in the figure) as the base point. Thus, by rotating the third opening/closing part 17e in this way, it is possible to close the third recessed hole 17b so that a part of it is not exposed to the outside (see FIG. 3(a) and FIG. 5(a)), or open the third recessed hole 17b so that a part of it is exposed to the outside (see FIG. 5(b)).

On the other hand, as shown in FIG. 3(b), the base end 17d of the third fixing part 17 is provided with a second connecting part 18 on the underside 17f side of the third fixing part 17. As shown in FIG. 3(b), this second connecting part 18 is formed in a rod shape in a side view, and is fixed to the third fixing part 17 by a screw or the like.

Now, as shown in FIG. 7, the untwister 8A is connected to this second connecting part 18. Specifically, as shown in FIG. 3(a), a circular through hole 18b is provided in the top and bottom direction at the tip 18a of the second connecting part 18. Then, as shown in FIG. 7, the pin bolt 8Aa1 is inserted into the U-shaped member 8Aa provided at the tip of the untwister 8A, and the pin bolt 8Aa1 is inserted into the through hole 18b of the second connecting part 18, so that the second connecting part 18 and the untwister 8A are connected. On the other hand, as shown in FIG. 7, a communication or power cable KB is attached to the U-shaped member 8Ab provided at the rear end of the untwister 8A via a connection net 30. This connects the communication or power cable KB to the second connecting part 18.

On the other hand, as shown in FIG. 3, a trapezoidal fourth fixing part 19 is integrally attached to the tip 11c of the first fixing part 11. As shown in FIG. 3(b), a circular through hole 19c is provided in the fourth fixing part 19 from the tip 19a to the base end 19b along the axis O of the towing tool 10. As shown in FIG. 4, a fourth opening and closing part 19d is provided above the fourth fixing part 19. As shown in FIG. 4(b), the fourth opening and closing part 19d is formed in a semicircular arc shape, and is fixed by a pair of bolts 19d1, as shown in FIG. 4(a). As shown in FIG. 4(b), by loosening one of the pair of bolts 19d1 (the bolt located on the right side in the figure), the fourth opening and closing part 19d rotates around the other bolt 19d1 (the bolt located on the left side in the figure). Thus, by rotating the fourth opening/closing part 19d in this manner, the through hole 19c can be closed so that it is not exposed to the outside (see Figs. 3 and 4(a)), or opened so that the through hole 19c is exposed to the outside (see Fig. 4(b)). The suspension wire TL shown in Fig. 7 is inserted into the through hole 19c, and the first recessed hole 11b, the second recessed hole 12b, the hollow hole 13a, the third recessed hole 17b, and the through hole 19c are connected. Therefore, the first recessed hole 11b, the second recessed hole 12b, the hollow hole 13a, the third recessed hole 17b, and the through hole 19c form a cavity in the towing tool 10 from the tip side to the base end side.

On the other hand, as shown in FIG. 3(b), an inverted L-shaped third connecting part 20 is provided on the underside 19e of the fourth fixing part 19. As shown in FIG. 3(b), this third connecting part 20 is composed of a trapezoidal third connecting part main body 20A that is integrally attached to the underside 19e of the fourth fixing part 19, and a rod-shaped mounting part 20B that is integrally provided and protrudes outward from the underside 20Aa of the third connecting part main body 20A.

As shown in Fig. 7, the untwister 8B is connected to the third connecting part 20 via a shackle 8C. Specifically, as shown in Fig. 3(a), a circular through hole 20Bb is provided in the top-bottom direction at the tip 20Ba of the mounting part 20B of the third connecting part 20. As shown in Fig. 7, the shackle 8C is composed of a U-shaped shackle body 8Ca with a bolt insertion hole (not shown) formed at the rear end (right side of the figure) and a pin bolt 8Cb that can be inserted and removed across the bolt insertion hole (not shown). As a result, the third connecting part 20 and the shackle 8C are connected by inserting the pin bolt 8Cb through the bolt insertion hole (not shown) and inserting the pin bolt 8Cb into the through hole 20Bb of the third connecting part 20 (see Fig. 3(a)). As shown in FIG. 7, the rear end 8Ba of the untwister 8B is connected to the tip end (left side of the figure) of the shackle 8C, and the end KRb of the towing rope KR is wound and attached to the tip end 8Bb of the untwister 8B. This connects the towing rope KR to the third connecting part 20.

Thus, using the towing tool 10 configured as described above, the worker S on the gondola Ca of the aerial work platform C shown in FIG. 1(b) inserts the suspension line TL, which has been installed in advance between the utility poles D1, D2, and D3, into the towing tool 10 as shown in FIG. 7. That is, the fourth opening/closing part 19d of the fourth fixed part 19 is opened as shown in FIG. 4(b), and the third opening/closing part 17e of the third fixed part 17 is opened as shown in FIG. 5(b), and the cover part 13c of the rotating part 13 is removed. As a result, the first recessed hole 11b, the second recessed hole 12b, the hollow hole 13a, the third recessed hole 17b, and the through hole 19c, which are all connected to each other, are all opened. In this state, if the towing tool 10 is moved along the suspension line TL from below the suspension line TL, the suspension line TL, which has been installed in advance between the utility poles D1, D2, and D3, can be inserted into the towing tool 10. Then, the fourth opening/closing part 19d of the fourth fixing part 19 is closed as shown in FIG. 4(a), and the third opening/closing part 17e of the third fixing part 17 is closed as shown in FIG. 5(a), and the cover part 13c of the rotating part 13 is attached. As a result, the fourth opening/closing part 19d, the third opening/closing part 17e, and the cover part 13c can prevent the suspension wire TL from slipping out of the first recessed hole 11b, the second recessed hole 12b, the hollow hole 13a, the third recessed hole 17b, and the through hole 19c, and thus the suspension wire TL can be maintained in a state in which it is inserted into the towing tool 10.

Next, the spiral cable hanger HK is connected to the first connecting part 14 of the towing tool 10, and the untwister 8A to which the communication or power cable KB is attached is connected to the second connecting part 18 via the connection net 30. Then, the untwister 8B to which the end KRb of the towing rope KR is attached is connected to the third connecting part 20 of the towing tool 10 via the shackle 8C. At this time, the suspension line TL, the spiral cable hanger HK, and the communication or power cable KB are bundled together. That is, as shown in Figures 1(b), 7, and 8(b) and (c), the spiral cable hanger HK is connected to the first connecting part 14 of the towing tool 10 so that the spiral cable hanger HK is wound around the suspension line TL and the communication or power cable KB, and the untwister 8A to which the communication or power cable KB is attached is connected to the second connecting part 18 via the connection net 30. During this connection operation, the operation of the spiral cable hanger forming device 4 is temporarily stopped.

Next, after completing the above-mentioned installation work, the spiral cable hanger forming device 4 is started to operate, and the towing rope KR is wound up using the towing device 7. As a result, the towing rope KR is towed in the direction of the arrow P2, as shown in FIG. 1(b).

Thus, when the towing rope KR is towed in this way, the towing tool 10 is towed in the direction of the arrow P3 shown in FIG. 8(a). At this time, since the towing tool 10 supports the suspension line TL that has been installed in advance, the towing tool 10 is towed along the suspension line TL. At this time, the spiral cable hanger HK is continuously formed by the spiral cable hanger forming device 4 and sent out while rotating, so that the first connecting part 14 of the towing tool 10 to which the spiral cable hanger HK is connected also tries to rotate with the rotation. At that time, since the first connecting part 14 is attached to the rotating part 13 as described above, the rotating part 13 rotates in the direction of the arrow Y1 as shown in FIG. 8(a) with the movement of the first connecting part 14 trying to rotate. As a result, when the towing tool 10 is towed by the towing rope KR in the direction of the arrow P3 shown in FIG. 8(a), the first connecting part 14 rotates together with the rotating part 13 as the spiral cable hanger HK rotates, so that the spiral cable hanger HK is towed in the direction of the arrow P3 while rotating. Thus, the spiral cable hanger HK can be towed in the direction of the arrow P3 without placing unnecessary load on the spiral cable hanger HK.

Next, when the towing tool 10 is towed in the direction of arrow P3 shown in Fig. 8(a), the towing tool 10 passes through the pulley 1 as shown in Fig. 8(b). That is, as shown in Fig. 8, the pulley 1 is composed of a substantially U-shaped attachment part 1a attached to the rope R tied to each of the utility poles D1, D2, and D3 (see Fig. 1(b)), and a pulley 1b rotatably fixed to the lower end of the attachment part 1a, and the towing tool 10 passes over the pulley 1b.

Next, when the towing tool 10 passes through the pulley 1, the suspension wire TL, the spiral cable hanger HK, and the communication or power cable KB are arranged in a bundled state within the pulley 1, that is, the suspension wire TL and the communication or power cable KB are wrapped around the spiral cable hanger HK, as shown in FIG. 8(c).

Thus, in this manner, the spiral cable hanger HK and the communication or power cable KB are simultaneously installed between the utility poles D1, D2, and D3.

Next, as shown in Figure 2, the rope R and pulley 1 are removed, and the suspension line TL is tensioned using the suspension bands 3 attached to the utility poles D1, D2, and D3. The spiral cable hangers HK are then cut to the length required for each of the utility poles D1 and D2 and the utility poles D2 and D3, and are fixed to the utility poles D1, D2, and D3 using the end clamps 6. Note that when tensioning the suspension line TL using the suspension bands 3, and when cutting the spiral cable hangers HK to the length required for each of the utility poles D1 and D2 and the utility poles D2 and D3 and fixing them to the utility poles D1, D2, and D3 using the end clamps 6, it is preferable to work from the utility pole D3 side onwards, since a state of tension must be maintained.

According to the present embodiment described above, the suspension line TL that has been installed in advance is inserted inside the towing tool 10, the towing rope KR is attached to one end of the towing tool 10 (the third connecting part 20 side), and the spiral cable hanger HK and the communication or power cable KB are attached to the other end of the towing tool 10 (the first connecting part 14, the second connecting part 18 side). The towing tool 10 in this state is towed by pulling the towing rope KR, thereby simultaneously erecting the spiral cable hanger HK and the communication or power cable KB between the utility poles D1, D2, and D3.

This has the advantage that the suspension wire TL has strength compared to conventional parent ropes, and therefore has less slack compared to parent ropes. As a result, slack during extension can be reduced, and the possibility of interference with other communication lines such as cable television can be reduced. Furthermore, since the metal pulley 1 only needs to be attached to the utility poles D1, D2, and D3, there is no need to attach the metal pulley 1 between utility poles. Furthermore, the existing suspension wire TL can be used to erect the spiral cable hanger HK and the communication or power cable KB. Furthermore, since there is less slack compared to parent ropes, it can also be used in long span locations such as river crossings.

Therefore, this embodiment can improve workability and safety.

In addition, according to this embodiment, the first recessed hole 11b, the second recessed hole 12b, the hollow hole 13a, the third recessed hole 17b, and the through hole 19c are provided inside the towing tool 10 so that the suspension wire TL can be inserted inside the towing tool 10. This allows the suspension wire TL to be inserted inside the towing tool 10. Furthermore, by closing the fourth opening and closing part 19d of the fourth fixing part 19 as shown in FIG. 4(a), the through hole 19c is closed, and by closing the third opening and closing part 17e of the third fixing part 17 as shown in FIG. 5(a), a part of the third recessed hole 17b is closed, and further, by attaching the cover part 13c of the rotating part 13, the hollow hole 13a is closed. This allows the suspension wire TL to be maintained inserted inside the towing tool 10.

According to this embodiment, the towing tool 10 can be attached to the suspension line TL while the suspension line TL is in a suspended state, which further improves workability and safety.

Note that the shapes and the like shown in this embodiment are merely examples, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims. For example, in this embodiment, for convenience of explanation, an example is shown in which the spiral cable hanger HK and the communication or power cable KB are simultaneously installed between the utility poles D1, D2, and D3 that are erected in a straight line, but the present invention is not limited to this, and can also be applied to installation between utility poles that are not erected in a straight line, for example, installed at a right angle. However, in this case, it is preferable that the spiral cable hanger HK be freely movable in accordance with the movement of the towing rope KR so that the spiral cable hanger HK is not damaged. Therefore, in this embodiment, the first connecting part 14 that holds the spiral cable hanger HK is freely movable in the up, down, left and right directions, and the spiral cable hanger HK is freely movable in accordance with the movement of the towing rope KR.

In addition, in this embodiment, an example is shown in which the through hole 19c is closed by closing the fourth opening/closing portion 19d of the fourth fixed portion 19 as shown in FIG. 4(a), a part of the third recessed hole 17b is closed by closing the third opening/closing portion 17e of the third fixed portion 17 as shown in FIG. 5(a), and the hollow hole 13a is closed by attaching the lid portion 13c of the rotating portion 13, but the present invention is not limited to this, and a structure may be used in which the first recessed hole 11b, the second recessed hole 12b, the hollow hole 13a, the third recessed hole 17b, and the through hole 19c are all closed.

In this embodiment, the spiral cable hanger HK and the communication or power cable KB are installed between utility poles, but the present invention is not limited to this and can be applied to any installation section.

1: pulley 10: traction tool 11b: first recess (hollow portion)
12b Second recess (hollow portion)
13a Hollow hole (hollow portion)
13c Lid (opening/closing part)
14 First connecting portion (other end)
17b Third recess (hollow portion)
17e Third opening/closing section (opening/closing section)
18 Second connecting portion (other end)
19c Through hole (hollow portion)
19d Fourth opening/closing section (opening/closing section)
20 Third connecting portion (one end)
D1, D2, D3 Electric pole KR Towing rope (towing line)
TL Suspension wire KB Communication or power cable HK Spiral cable hanger

Claims (2)

A suspension wire installed in an installation section such as between utility poles is inserted from one end side to the other end side, and a towing tool having a towing line attached to one end side and a spiral cable hanger and a communication or power cable attached to the other end side is towed by pulling the towing line, and the spiral cable hanger and the communication or power cable are simultaneously erected in the installation section,
The towing tool is
A rotating part that can rotate in a predetermined direction;
a coupling portion provided on the rotating portion so as to rotate together with the rotating portion,
A cable installation method , wherein the spiral cable hanger is rotatably connected to the connecting portion . The cable installation method according to claim 1, wherein the pulling tool has a hollow portion inside so that the suspension wire can be inserted from one end side to the other end side, and an opening/closing part is provided that can close or open at least a part of the hollow portion.

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