Method for replacing main rope of elevator and replacement aid

Abstract

Provided are an elevator main cable replacement method and a replacement assisting tool, which can lessen the burden on a worker. In an upper area of an elevator (1) equipped with a plurality of main cables (7), a newly provided main cable (7) is set in place to replace a portion, on the upper area side, of an existing main cable (7) that has been cut. A bent back section (33) of the newly provided main cable (7) which hangs downward is run along a movable pulley (22). A portion of the existing main cable (7) that has been cut, the portion running between the upper area and a lower area, is connected to the movable pulley (22). To prevent rotation of the bent back section (33) around an up-down direction, a pair of guide rings (23) are each placed on sections on both sides of another main cable (7) that is to be replaced, the both sides being identified when observed from a counterweight sheave (16) of the another main cable. While collecting the existing main cable (7) in the lower area, the bent back section (33) of the newly provided main cable (7) is lowered to the lower area by taking, as a guide, the other main cable (7) having the guide rings (23) placed thereon.

Description

Technical Field

[0001] The present disclosure relates to a method for replacing a main rope of an elevator and a replacement aid.

Background Art

[0002] Patent Document 1 discloses an example of a replacement aid for a main rope of an elevator. The replacement aid includes a horizontal bar member, a guide member, a sheave, and rope connection means. The horizontal bar member is provided across between the guide rails of the counterweight. The guide member is provided at both ends of the horizontal bar member and slides on the guide rail. The sheave is attached to the horizontal bar member with a newly installed main rope wound thereon. The rope connection means is provided on the horizontal bar member and connects the existing main rope.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the replacement aid of Patent Document 1 includes large parts such as a horizontal bar member spanning between the guide rails, it becomes heavy. For this reason, the load on the worker during attachment and removal of the replacement aid is large.

[0005] The present disclosure relates to solving such problems. The present disclosure provides a method for replacing a main rope of an elevator and a replacement aid that can further reduce the load on the worker.

Means for Solving the Problems

[0006] The method for replacing the main ropes of an elevator according to the present disclosure is applicable to an elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side and a second portion on the other side as viewed from the lower sheave of each of the plurality of main ropes are arranged across the upper region and the lower region in a hoistway. The method for replacing the main ropes includes an upper cutting step of cutting each of the first portion and the second portion of the existing first rope in the upper region, an upper arrangement step of replacing the existing first rope with a new first rope in the upper region and providing a folded-back portion hanging downward in the upper region, a wire tensioning step of applying tension to the first portion and the second portion of the second rope, an auxiliary tool attachment step of, after the upper arrangement step, hanging a grooved wheel of a movable pulley on the folded-back portion of the new first rope in the upper region and hanging a first guide ring on the first portion of the first rope and the first portion of the second rope and a second guide ring on the second portion of the first rope and the second portion of the second rope so as to suppress rotation of the folded-back portion around the vertical direction, a connection step of connecting, in the upper region, the portion of the existing first rope cut in the upper cutting step and arranged across the upper region and the lower region to the movable pulley after the upper cutting step and the auxiliary tool attachment step, an installation and recovery step of lowering the folded-back portion of the new first rope to the lower region while recovering the existing first rope in the lower region using the first portion of the second rope on which the first guide ring is hung and the second portion of the second rope on which the second guide ring is hung as guides after the wire tensioning step and the connection step, and a lower arrangement step of removing the folded-back portion of the new first rope from the grooved wheel of the movable pulley and hanging it on the lower sheave in the lower region after the installation and recovery step. The method for replacing the main ropes of an elevator according to the present disclosure is applicable to an elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side and a second portion on the other side of each of the plurality of main ropes as viewed from the lower sheave are arranged across the upper region and the lower region in a hoistway. The method for replacing the main ropes includes an upper cutting step of cutting each of the first portion and the second portion of the existing first rope in the upper region, an upper arrangement step of replacing the existing first rope with a newly installed first rope in the upper region and providing a folded-back portion hanging downward in the upper region, a wire tensioning step of applying tension to the first portion and the second portion of the second rope, an auxiliary tool attachment step of, after the upper arrangement step, hanging a grooved wheel of a movable pulley on the folded-back portion of the newly installed first rope in the upper region, and hanging the first portion of the second rope on a first guide ring attached to the movable pulley and the second portion of the second rope on a second guide ring attached to the movable pulley so as to suppress rotation of the folded-back portion in the vertical direction, a connection step of connecting, in the upper region, a portion of the existing first rope cut in the upper cutting step and arranged across the upper region and the lower region to the movable pulley, an installation and recovery step of, after the wire tensioning step and the connection step, lowering the folded-back portion of the newly installed first rope to the lower region while recovering the existing first rope in the lower region using the first portion of the second rope on which the first guide ring is hung and the second portion of the second rope on which the second guide ring is hung as guides, and a lower arrangement step of, after the installation and recovery step, removing the folded-back portion of the newly installed first rope from the grooved wheel of the movable pulley and hanging it on the lower sheave in the lower region.

[0007] The replacement aid for the main ropes of an elevator according to the present disclosure is applicable to an elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side and a second portion on the other side of each of the plurality of main ropes as viewed from the lower sheave are arranged to span between the upper region and the lower region in a hoistway, and is a replacement aid used in a method for replacing the main ropes, the replacement aid including a grooved pulley around which a folded portion of the newly installed first rope hanging downward from the upper region is hung, and a connecting portion to which a portion of the existing first rope cut in the upper region and arranged to span between the upper region and the lower region is connected, the replacement aid further including a movable pulley having the grooved pulley and the connecting portion, a first guide ring hung on the first portion of the first rope and the first portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction, and a second guide ring hung on the second portion of the first rope and the second portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction. The replacement aid for the main ropes of an elevator according to the present disclosure is applicable to an elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, and a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side as viewed from the lower sheave of each of the plurality of main ropes and a second portion on the other side as viewed from the lower sheave are used in a method for replacing the main ropes performed in a state of being arranged across the upper region and the lower region in a hoistway. The replacement aid includes a grooved wheel on which a folded portion of the newly installed first rope hanging downward from the upper region is hung, and a connecting portion to which a portion of the existing first rope cut in the upper region and arranged across the upper region and the lower region is connected, and a moving pulley having the connecting portion, a first guide ring attached to the moving pulley and hung on the first portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction, and a second guide ring attached to the moving pulley and hung on the second portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction.

Advantages of the Invention

[0008] According to the replacement method or replacement aid according to the present disclosure, the load on the worker performing the replacement work of the main ropes of the elevator is further reduced.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0010] The mode for carrying out the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and the overlapping descriptions are appropriately simplified or omitted. Note that the subject of the present disclosure is not limited to the following embodiments, and within the scope not departing from the gist of the present disclosure, deformation of any component of the embodiment or omission of any component of the embodiment is possible.

[0011] Embodiment 1. FIG. 1 is a configuration diagram of the elevator 1 which concerns on Embodiment 1.

[0012] The elevator 1 is applied to, for example, a building having a plurality of floors. In the building, a hoistway 2 of the elevator 1 is provided. The hoistway 2 is a vertically long space extending over a plurality of floors. On each floor, a landing 3 is provided. The landing 3 is a place adjacent to the hoistway 2. In this example, a machine room 4 is provided above the hoistway 2. At the bottom of the hoistway 2, a pit 5 is provided. The elevator 1 includes a hoisting machine 6, a main rope 7a, a main rope 7b, a car 8, and a counterweight 9. Here, when the main rope 7a, the main rope 7b, etc. are not particularly distinguished, they may simply be referred to as the main rope 7. The elevator 1 includes a plurality of main ropes 7 including the main rope 7a and the main rope 7b. The elevator 1 may also include other main ropes (not shown). That is, the elevator 1 may include three or more main ropes 7. The elevator 1 is, for example, a 2:1 roping elevator.

[0013] The hoisting machine 6 is arranged, for example, in the machine room 4. The hoisting machine 6 may also be arranged, for example, at the upper part of the hoistway 2. The hoisting machine 6 includes a motor and a drive sheave. The motor of the hoisting machine 6 is a device that generates driving force. The drive sheave of the hoisting machine 6 is a sheave that rotates by the driving force generated by the motor of the hoisting machine 6.

[0014] Each main rope 7 is, for example, a wire rope formed by twisting strands. Each main rope 7 is wound around the drive sheave of the hoist 6. In this example, each main rope 7 is wound around the deflecting pulley 10 arranged in the machine room 4. Each main rope 7 supports the load of the car 8 on one side of the drive sheave of the hoist 6. Each main rope 7 supports the load of the counterweight 9 on the other side of the drive sheave of the hoist 6. One end of each main rope 7 is fixed by the terminal device 11p in the upper region of the elevator 1. Also, the other end of each main rope 7 is fixed by the terminal device 11q in the upper region of the elevator 1. Here, when the terminal device 11p, the terminal device 11q, etc. are not particularly distinguished, they may simply be referred to as the terminal device 11. The upper region of the elevator 1 is, for example, the upper end of the hoistway 2 including the portion corresponding to the top floor. The upper region of the elevator 1 may include the machine room 4 provided above the hoistway 2.

[0015] The car 8 is a device that transports users of the elevator 1, etc. between multiple floors by traveling up and down the hoistway 2. The car 8 is arranged between a pair of car guide rails 12 provided in the hoistway 2. Each car guide rail 12 is arranged parallel to each other along the vertical direction. The car 8 includes a car sheave 13 and a plurality of car guide shoes 14. The load of the car 8 is supported by a plurality of main ropes 7 wound around the car sheave 13. Each car guide shoe 14 is arranged toward one of the car guide rails 12. The car 8 travels in the vertical direction while being guided by the pair of car guide rails 12 through each car guide shoe 14 via a plurality of main ropes 7 that are wound up by the driving force generated by the motor of the hoist 6.

[0016] The balance weight 9 is a device that balances the loads applied to both sides of the drive sheave of the hoisting machine 6 with the car 8. The balance weight 9 is disposed between a pair of balance weight guide rails 15 provided in the hoistway 2. Each balance weight guide rail 15 is disposed parallel to each other along the vertical direction. The balance weight 9 includes a balance weight sheave 16 and a plurality of balance weight guide shoes 17. The load of the balance weight 9 is supported by a plurality of main ropes 7 wound around the balance weight sheave 16. Each balance weight guide shoe 17 is disposed toward one of the balance weight guide rails 15. The balance weight 9 travels on the opposite side of the traveling direction of the car 8 in the hoistway 2 while being guided by the pair of balance weight guide rails 15 through each balance weight guide shoe 17 via the plurality of main ropes 7 that are wound up by the driving force generated by the motor of the hoisting machine 6.

[0017] FIG. 2 is a front view of the terminal device 11 of the main rope 7 of the elevator 1 according to Embodiment 1.

[0018] The terminal device 11 of each main rope 7 includes a rod 18, a spring 19, and a nut 20. The rod 18 is a rod-shaped portion connected to, for example, a portion where the strands of the main rope 7 are twisted together. The nut 20 is passed through the threaded portion of the rod 18. The spring 19 is passed through the rod 18. By tightening or loosening the nut 20, the vertical position of the rod 18 and the like are adjusted. Also, by rotating, for example, the rod 18 of the terminal device 11, the twist of a portion where the strands of the main rope 7 are twisted together and the like are adjusted.

[0019] Here, the main rope 7 of the elevator 1 is replaced with a newly installed main rope 7 from the existing main rope 7, for example, during repair or maintenance. In the work of replacing the main rope 7, a replacement auxiliary tool (not shown in FIG. 2) is used.

[0020] FIG. 3 is a perspective view of the replacement auxiliary tool 21 according to Embodiment 1.

[0021] The replacement aid 21 includes a movable pulley 22 and a pair of guide rings 23.

[0022] The movable pulley 22 includes a grooved pulley 24, an outer frame 25, a shaft portion 26, and a hook 27. The grooved pulley 24 is a member around which the main rope 7 to be replaced is wound. The outer frame 25 is a member that houses the grooved pulley 24. The outer frame 25 is composed of, for example, a pair of side plates. In this example, the outer frame 25 houses the grooved pulley 24 between the pair of side plates. The shaft portion 26 is provided on the outer frame 25. The shaft portion 26 rotatably supports the grooved pulley 24. The hook 27 is attached to the outer frame 25. In this example, the movable pulley 22 is configured to be able to open the lower part of the grooved pulley 24 so that the main rope 7 can be easily hung on the grooved pulley 24. The hook 27 is attached to the side plate of the outer frame 25 via, for example, a hinge 28. The hook 27 may be detachably attached to the outer frame 25.

[0023] Each guide ring 23 is an annular member through which one or more main ropes 7 can pass through the ring. Each guide ring 23 is an annular member that can be opened and closed, such as a carabiner. One guide ring 23 is an example of a first guide ring. The other guide ring 23 is an example of a second guide ring.

[0024] Subsequently, an example of the replacement work of the main rope 7 using the replacement aid 21 will be described with reference to FIGS. 4 to 8. The replacement work is performed by, for example, a plurality of workers. Each step of the replacement work may be performed by changing the order if possible, or may be performed in parallel by, for example, one or a plurality of workers if possible. In FIGS. 4 to 8, the existing main rope 7 is indicated by a thick dotted line. Also, in FIGS. 4 to 8, the newly installed main rope 7 is indicated by a thick solid line. FIGS. 4 to 8 are diagrams showing an example of the replacement work of the main rope 7 using the replacement aid 21 according to Embodiment 1.

[0025] First, as shown in FIG. 4, an operator performing the replacement work moves the counterweight 9 to the lower region of the elevator 1. The lower region of the elevator 1 is, for example, the lower end of the hoistway 2 including the portion corresponding to the lowest floor. The lower region of the elevator 1 may include, for example, the portion corresponding to the ground floor where materials can be carried in and out from the outside of the building. In this example, the operator moves the counterweight 9 to the lowest floor. At this time, the car 8 moves to the top floor.

[0026] At this time, when each main rope 7 is traced from one end to the other end, it descends from the upper region to the lower region, is folded back by the counterweight sheave 16 in the lower region, and ascends from the lower region to the upper region. That is, for each main rope 7, the two parallel portions on the terminal device 11p side and the terminal device 11q side as seen from the counterweight sheave 16 are arranged across the upper and lower regions in the hoistway 2. Here, the counterweight sheave 16 is an example of the lower sheave in the lower region of the elevator 1. For each main rope 7, the portion on one side as seen from the counterweight sheave 16, which is arranged from the counterweight sheave 16 in the lower region to the upper region, is an example of the first portion. Also, for each main rope 7, the portion on the other side as seen from the counterweight sheave 16, which is arranged from the counterweight sheave 16 in the lower region to the upper region, is an example of the second portion. For example, the portion of each main rope 7 on the terminal device 11p side as seen from the counterweight sheave 16 is an example of the first portion. At this time, the portion of each main rope 7 on the terminal device 11q side as seen from the counterweight sheave 16 is an example of the second portion.

[0027] In this example, the worker sequentially replaces a plurality of main ropes 7, one by one, from the existing ones with newly installed ones. In this example, among the plurality of main ropes 7, after replacing the main rope 7a with a newly installed one, the worker replaces the main rope 7b with a newly installed one. Among the plurality of main ropes 7, the main rope 7 that is the replacement target, where the existing one is removed and a newly installed one is installed, is an example of the first rope. Among the plurality of main ropes 7, at least one other than the first rope is an example of the second rope. Here, the worker first removes the existing main rope 7a and installs a newly installed main rope 7a. At this time, the main rope 7a becomes an example of the first rope. Also, the main rope 7b becomes an example of the second rope.

[0028] In the upper region, the worker supports the load of the cage 8 on a structure or the like in the hoistway 2 using, for example, a chain block 29 or the like. In the lower region, the worker supports the load of the counterweight 9 on, for example, a pipe support 30 or the like. Thereby, in each of the main ropes 7, the tension applied by the loads of the cage 8 and the counterweight 9 is released.

[0029] Thereafter, in the lower region, the worker cuts each of the existing main ropes 7 at a cutting location W near the counterweight sheave 16 so as to divide the two parallel portions on the terminal device 11p side and the terminal device 11q side when viewed from the counterweight sheave 16.

[0030] Subsequently, as shown in FIG. 5, for each of the existing main ropes 7 cut at the cutting location W in the lower region, the worker fixes both the cutting end on the terminal device 11p side and the cutting end on the terminal device 11q side to a structure or the like in the hoistway 2 using, for example, a rope clip or the like. At this time, for each of the existing main ropes 7, the worker applies tension to the portion on the terminal device 11p side and the portion on the terminal device 11q side by pulling each of the cutting end on the terminal device 11p side and the cutting end on the terminal device 11q side in the longitudinal direction using, for example, a wire tensioner 31 or the like.

[0031] The worker cuts the portion of the existing main rope 7a on the terminal device 11p side at the cutting point X in the upper region above the balance weight sheave 16. Also, the worker cuts the portion of the existing main rope 7a on the terminal device 11q side at the cutting point Y in the upper region above the balance weight sheave 16. At this time, the worker temporarily fixes the cut end on the lower side of the cutting point X and the cut end on the lower side of the cutting point Y of the existing main rope 7a cut in the upper region to the structure of the hoistway 2 or the like in the upper region so as not to drop below the hoistway 2. The worker connects the cut end on the upper side of the cutting point X and the cut end on the upper side of the cutting point Y of the existing main rope 7a cut in the upper region. After the temporary fixing on the lower side of the cutting points X and Y and the connection on the upper side of the cutting points X and Y, the worker may perform the cutting at the cutting points X and Y.

[0032] The worker removes the part remaining in the upper region among the cut parts of the existing main rope 7a as follows. The part remaining in the upper region of the cut existing main rope 7a includes the end on the terminal device 11p side and the end on the terminal device 11q side. Here, the part including the end on the terminal device 11q side of the existing main rope 7a is wound around the cage sheave 13, the drive sheave of the hoist 6, and the deflecting wheel 10 in order from the side closer to the terminal device 11q. The worker cuts the part on the terminal device 11q side at the cutting point Z among the two parts pulled out from the cage sheave 13 of the existing main rope 7a. The worker carries the newly installed main rope 7a wound around the drum 32s to a working place in the upper region such as the landing 3 on the top floor. The worker connects the cutting end on the cage sheave 13 side of the cutting point Z of the existing main rope 7a and the end of the newly installed main rope 7a unwound from the drum 32s. The worker removes the end on the terminal device 11p side of the existing main rope 7a by, for example, pulling it to the terminal device 11p side and recovering it. Here, the cutting ends above the cutting points X and Y of the existing main rope 7a are connected to each other. Therefore, the end on the terminal device 11p side of the existing main rope 7a, the cutting end above the cutting point X, the cutting end above the cutting point Y, and the cutting end on the cage sheave 13 side of the cutting point Z are sequentially recovered on the terminal device 11p side. Also, the worker removes the end on the terminal device 11q side of the existing main rope 7a.

[0033] The worker arranges the newly installed main rope 7a in the upper region. Since the cutting end on the terminal device 11q side of the cutting point Z of the existing main rope 7a and the end of the newly installed main rope 7a are connected, by recovering the end on the terminal device 11p side of the existing main rope 7a, the newly installed main rope 7a is arranged in the upper region in place of the existing main rope 7a.

[0034] As shown in FIG. 6, the operator connects the end of the newly installed main rope 7a that was connected to the existing main rope 7a among the ends of the newly installed main rope 7a to the terminal device 11p. At this time, the newly installed main rope 7a is wound around the deflecting car 10, the drive sheave of the hoist 6, and the car sheave 13 in order from the side closer to the terminal device 11p. At this time, the operator provides a folding portion 33 in the newly installed main rope 7a in the upper region. The folding portion 33 is a portion that hangs downward below the newly installed main rope 7a. The folding portion 33 hangs downward in a U shape, for example. Here, the operator may apply tension to the newly installed main rope 7a, for example, by hanging the newly installed main rope 7a on an auxiliary sheave (not shown) provided in the upper region so that the twist of the newly installed main rope 7a does not unwind.

[0035] Subsequently, as shown in FIG. 7, the operator hangs the groove wheel 24 of the movable pulley 22 of the replacement auxiliary tool 21 on the folding portion 33 of the newly installed main rope 7a in the upper region. The operator hangs one guide ring 23 of the replacement auxiliary tool 21 on the portion of the newly installed main rope 7a drawn out from the groove wheel 24 of the movable pulley 22 on the terminal device 11p side, and on the portion of the existing main rope 7b arranged between the upper region and the lower region on the terminal device 11p side. The operator hangs the other guide ring 23 of the replacement auxiliary tool 21 on the portion of the newly installed main rope 7a drawn out from the groove wheel 24 of the movable pulley 22 on the drum 32s side, and on the portion of the existing main rope 7b arranged between the upper region and the lower region on the terminal device 11q side. In this example, the operator hangs each guide ring 23 above the shaft portion 26 of the movable pulley 22. At this time, since the set of the newly installed main rope 7a and the existing main rope 7b to which tension is applied, which are hung on the movable pulley 22, is connected by a pair of guide rings 23 on both sides of the groove wheel 24, the rotation of the folding portion 33 around the vertical direction is suppressed.

[0036] The operator connects the lower cutting end of the cutting point X of the existing main rope 7a cut in the upper region and the lower cutting end of the cutting point Y of the existing main rope 7a cut in the upper region among the cut parts of the existing main rope 7a to the movable pulley 22 in the upper region. The operator connects the existing main rope 7a and the movable pulley 22, for example, by hanging the existing main rope 7a on the hook 27. At this time, the hook 27 of the movable pulley 22 is an example of the connecting part.

[0037] The operator transports the drum 32t for winding the existing main rope 7a to the working place in the lower region, such as the landing 3 on the lowest floor. The operator connects both cutting ends of the existing main rope 7a cut at the cutting point W in the lower region to the drum 32t transported to the lower region. While the operator retrieves the existing main rope 7a on the drum 32t in the lower region, the operator pays out the new main rope 7a from the drum 32s in the upper region. At this time, the folded-back part 33 of the new main rope 7a is lowered to the lower region using as a guide the two strands of the existing main rope 7b stretched between the upper region and the lower region via a pair of guide rings 23. At this time, since the load of the existing main rope 7a is applied to the folded-back part 33 of the new main rope 7a through the movable pulley 22, the load on the operator for paying out the new main rope 7a is reduced.

[0038] Also, as the folded portion 33 of the newly installed main rope 7a moves downward, due to the twist of the newly installed main rope 7a, a force is generated that causes the folded portion 33 to rotate, i.e., twist, around the vertical direction. At this time, since the folded portion 33 of the newly installed main rope 7a is connected through a pair of guide rings 23 to two portions of the main rope 7b stretched between the upper region and the lower region, the rotation around the vertical direction is suppressed. On the other hand, as the length from the upper region to the folded portion 33 of the newly installed main rope 7a increases, the force that causes twist due to the twist of the newly installed main rope 7a increases. For this reason, the operator feeds out the newly installed main rope 7a while rotating the end on the terminal device 11p side according to the length of the newly installed main rope 7a fed out, so as to suppress the twist caused by the twist of the newly installed main rope 7a. In this example, the operator feeds out the newly installed main rope 7a while rotating the end on the terminal device 11p side by an amount of rotation proportional to the length of the newly installed main rope 7a fed out.

[0039] After that, as shown in FIG. 8, the operator removes the movable pulley 22 from the folded portion 33 of the newly installed main rope 7a in the lower region. The operator hangs the folded portion 33 of the newly installed main rope 7a on the counterweight sheave 16 in the lower region. The operator applies tension to the newly installed main rope 7a by pulling it outward in the longitudinal direction, for example, by a wire tensioner 31 or the like, in the lower region. By applying tension to the newly installed main rope 7a, it is possible to suppress the untwisting of the newly installed main rope 7a. The operator pulls the upward side portion when the counterweight 9 rises among the two portions of the newly installed main rope 7a stretched between the upper region and the lower region, in the lower region. Here, since the two portions of the newly installed main rope 7a stretched between the upper region and the lower region are connected through the portion hung on the counterweight sheave 16, tension is applied to both portions by pulling one portion.

[0040] In the lower region, the operator removes each guide ring 23 from the newly installed main rope 7a and the existing main rope 7b. In the upper region, the operator connects the end of the newly installed main rope 7a on the drum 32s side to the terminal device 11q. In this way, the main rope 7a is replaced with a newly installed one from the existing one.

[0041] After that, the operator removes the existing main rope 7b and installs a newly installed main rope 7b. At this time, the main rope 7b is an example of the first rope. Also, the main rope 7a is an example of the second rope.

[0042] The operator cuts the existing main rope 7b in the upper region in the same procedure as for the main rope 7a. After that, the operator places the newly installed main rope 7b in the upper region in place of the existing main rope 7b. At this time, the operator provides a folding part 33 on the newly installed main rope 7b in the upper region.

[0043] After that, in the upper region, the operator hangs the groove wheel 24 of the movable pulley 22 of the replacement auxiliary tool 21 on the folding part 33 of the newly installed main rope 7b. The operator hangs one guide ring 23 of the replacement auxiliary tool 21 on the part of the newly installed main rope 7b drawn out from the groove wheel 24 on the terminal device 11p side, and on the part of the newly installed main rope 7a arranged across the upper and lower regions on the terminal device 11p side. The operator hangs the other guide ring 23 of the replacement auxiliary tool 21 on the part of the newly installed main rope 7b drawn out from the groove wheel 24 on the drum 32s side, and on the part of the newly installed main rope 7a arranged across the upper and lower regions on the terminal device 11q side. At this time, since the set of the newly installed main rope 7b hung on the movable pulley 22 and the newly installed main rope 7a given tension is connected by a pair of guide rings 23 on both sides of the groove wheel 24, the rotation around the vertical direction of the folding part 33 is suppressed.

[0044] The operator connects the lower cutting end of the existing main rope 7b cut in the upper region among the cut parts of the existing main rope 7b to the movable pulley 22 in the upper region. The operator connects both cutting ends of the existing main rope 7b cut at the cutting point W in the lower region to the drum 32t carried into the lower region. While the operator retrieves the existing main rope 7b on the drum 32t in the lower region, the operator pays out the new main rope 7b from the drum 32s in the upper region. At this time, the folded part 33 of the new main rope 7b is lowered to the lower region using, as a guide, the two strands of the new main rope 7a stretched between the upper region and the lower region via a pair of guide rings 23. At this time, since the load of the existing main rope 7b is applied to the folded part 33 of the new main rope 7b through the movable pulley 22, the load on the operator paying out the new main rope 7b is reduced.

[0045] Also, as the folded part 33 of the new main rope 7b moves downward, due to the twist of the new main rope 7b, a force is generated that causes the folded part 33 to rotate, i.e., twist, in the vertical direction. At this time, since the folded part 33 of the new main rope 7b is connected to the two strands of the main rope 7a stretched between the upper region and the lower region through a pair of guide rings 23, the rotation in the vertical direction is suppressed. Also, the operator pays out the new main rope 7b while rotating the end on the terminal device 11p side according to the length of the new main rope 7b paid out, so as to suppress the twist due to the twist of the new main rope 7b. In this example, the operator pays out the new main rope 7b while rotating the end on the terminal device 11p side by an amount of rotation proportional to the length of the new main rope 7b paid out.

[0046] Thereafter, the operator removes the movable pulley 22 from the folded part 33 of the new main rope 7b in the lower region. The operator hangs the folded part 33 of the new main rope 7b on the counterweight sheave 16 in the lower region. The operator applies tension to the new main rope 7b by pulling the new main rope 7b outward in the longitudinal direction, for example, using a wire tensioner 31 or the like, in the lower region. By applying tension to the new main rope 7b, it is possible to suppress the untwisting of the new main rope 7b.

[0047] In the lower region, the operator removes each guide ring 23 from the newly installed main ropes 7b and 7a. In the upper region, the operator connects the end of the newly installed main rope 7b on the side of the drum 32s to the terminal device 11q. In this way, the main rope 7b is replaced with a newly installed one from the existing one.

[0048] After the operator replaces all the main ropes 7 with newly installed ones, the operator removes the chain block 29, the pipe support 30, etc., and applies the tension due to the load of the cage 8 and the counterweight 9 to each main rope 7. At this time, the operator removes the wire tensioner 31, etc., that has been applying tension to the newly installed main rope 7.

[0049] In the elevator 1 having three or more main ropes 7, the guide ring 23 may be hung on three or more main ropes 7 including the newly installed main rope 7 on which the movable pulley 22 is hung on the folding part 33 and the other plurality of main ropes 7. That is, a plurality of second ropes may be used for one first rope. At this time, the other plurality of main ropes 7 may be only the existing main ropes 7, may be only the newly installed main ropes 7 that have already been replaced, or may be a mixture of the existing main ropes 7 and the newly installed main ropes 7. Since the suspension of the folding part 33 is guided by the plurality of tensioned main ropes 7, the torsion of the folding part 33 can be more effectively suppressed.

[0050] As described above, the method for replacing the main ropes 7 of the elevator 1 according to Embodiment 1 is applicable to an elevator 1 having a plurality of main ropes 7. Both ends of each main rope 7 are fixed in the upper region of the elevator 1. Each main rope 7 is wound around a counterweight sheave 16. The replacement method is carried out in a state where the counterweight sheave 16 is in the lower region of the elevator 1, and the portions on both sides of each main rope 7 as seen from the counterweight sheave 16 are arranged across the upper and lower regions in the hoistway 2. The lower region is the region below the upper region. The replacement method includes an upper cutting step, an upper arrangement step, a wire tensioning step, an attachment of auxiliary tool step, a connection step, an installation and recovery step, and a lower arrangement step. In the upper cutting step, the operator cuts the portions on both sides of the existing main rope 7 to be replaced as seen from the counterweight sheave 16 in the upper region. In the upper arrangement step, the operator replaces the existing main rope 7 to be replaced with a new main rope 7 to be replaced and provides a folded-back portion 33 that hangs downward in the upper region. In the wire tensioning step, the operator applies tension to the portions on both sides of the other main ropes 7 as seen from the counterweight sheave 16. The attachment of auxiliary tool step is performed after the upper arrangement step. In the attachment of auxiliary tool step, the operator hangs the groove wheel 24 of the movable pulley 22 on the folded-back portion 33 of the new main rope 7 to be replaced in the upper region. In the attachment of auxiliary tool step, the operator hangs one guide ring 23 each on the portions on both sides of the main rope 7 to be replaced and the other main ropes 7 as seen from the counterweight sheave 16 so as to suppress the rotation of the folded-back portion 33 around the vertical direction. The connection step is performed after the upper cutting step and the attachment of auxiliary tool step. In the connection step, the operator connects the portion of the existing main rope 7 cut in the upper cutting step, which is arranged across the upper and lower regions, to the movable pulley 22 in the upper region. The installation and recovery step is performed after the wire tensioning step and the connection step. In the installation and recovery step, while the operator recovers the existing main rope 7 to be replaced in the lower region, using the portions on both sides of the other main ropes 7 with the guide rings 23 as guides, the operator lowers the folded-back portion 33 of the new main rope 7 to be replaced to the lower region. The lower arrangement step is performed after the installation and recovery step.In the lower placement step, the worker removes the folded-back portion 33 of the new main rope 7 to be replaced from the groove wheel 24 of the movable pulley 22 in the lower region and hangs it on the counterweight sheave 16. Also, the main rope replacement aid 21 of the elevator 1 according to the first embodiment includes a movable pulley 22 and a pair of guide rings 23. The movable pulley 22 includes a groove wheel 24 and a hook 27. The folded-back portion 33 of the new main rope 7 to be replaced is hung on the groove wheel 24. The portion of the existing main rope 7 to be replaced, which is cut in the upper region and is disposed between the upper region and the lower region, is connected to the hook 27. The pair of guide rings 23 are respectively hung on one side portion as viewed from the counterweight sheaves 16 of the main rope 7 to be replaced and the other main ropes 7 so as to suppress the rotation of the folded-back portion 33 around the vertical direction, and on the other side portion as viewed from the counterweight sheaves 16 of the main rope 7 to be replaced and the other main ropes 7.

[0051] With such a configuration, the rotation of the main rope 7 to be replaced around the vertical direction is suppressed by the guide of the other main ropes 7. Since the other main ropes 7 are stretched in parallel adjacent to the main rope 7 to be replaced, it is not necessary to configure the replacement aid 21 to reach a long object located at a position away from the main ropes 7 such as the counterweight guide rail 15. For this reason, the replacement aid 21 does not require long components such as arms or horizontal bar members, and thus becomes lighter and more compact. For this reason, the work load of the worker who attaches the replacement aid 21 to the main rope 7 to be replaced is further reduced. Also, since the replacement aid 21 is lightened, the necessity of constructing a work scaffold for its attachment and the like is suppressed. Thereby, the work efficiency of the replacement work of the main rope 7 is further enhanced. Also, since the balance between the new main rope 7 paid out in the installation and recovery step and the existing main rope 7 to be recovered is achieved, the load on the worker who pays out the new main rope 7 is reduced. Also, since the upper cut end of the existing main rope 7 is suspended by the new main rope 7 and the movable pulley 22, a device such as a winch for suspending the existing main rope 7 in the replacement work is not required.

[0052] In addition, the installation and recovery process includes a procedure of feeding out the main rope 7 while rotating at least one end thereof according to the length of the main rope 7 fed out, so as to suppress the twist caused by the twist of the main rope 7 of the newly installed replacement target.

[0053] With such a configuration, even in the elevator 1 where the hoisting height is high, the hoistway 2 is long, and the length from the upper region to the turning part 33 is long, the occurrence of twist caused by the twist of the newly installed main rope 7 can be suppressed. As a result, the replacement work can be performed more reliably without deteriorating the quality of the newly installed main rope 7.

[0054] Also, the method for replacing the main rope 7 includes a lower cutting process. In the lower cutting process, the operator cuts in the lower region so as to divide the portions on both sides as viewed from the balance weight sheave 16 of the other existing main rope 7 to be replaced. The wire tensioning process is performed after the lower cutting process. The wire tensioning process includes a procedure of applying tension to the portions on both sides of the existing other main rope 7 cut in the lower region in the lower cutting process by pulling each of the cutting ends on both sides.

[0055] With such a configuration, since the other existing main rope 7 already arranged between the upper region and the lower region is used as a guide, it is not necessary to arrange a long guide object or the like in the hoistway 2. Therefore, the working efficiency of the replacement work of the main rope 7 is further improved.

[0056] Alternatively, the wire tensioning process includes a procedure of applying tension to the portions on both sides of the main rope 7 as viewed from the balance weight sheave 16 of the other main rope 7 of the newly installed replacement target by pulling the portion on the ascending side when the balance weight 9 ascends among the portions on both sides.

[0057] With such a configuration, since the newly installed other main rope 7 disposed in advance between the upper region and the lower region is used as a guide, it is not necessary to dispose a long member for guiding or the like in the hoistway 2. Further, since the portion where tension is applied to the newly installed main rope 7 does not pass through the balance weight sheave 16, the load applied to the newly installed main rope 7 is suppressed.

[0058] Note that the lower sheave in the lower region does not have to be the balance weight sheave 16. For example, in the elevator 1 in which the hoisting machine 6 is provided in the lower region of the hoistway 2, the driving sheave of the hoisting machine 6 may be used as the lower sheave to apply the method for replacing the main rope 7.

[0059] Embodiment 2. In Embodiment 2, the points different from the example disclosed in Embodiment 1 will be described in particular detail. For the features not described in Embodiment 2, any features of the example disclosed in Embodiment 1 may be adopted.

[0060] FIG. 9 is a perspective view of the replacement auxiliary tool 21 according to Embodiment 2.

[0061] The movable pulley 22 of the replacement auxiliary tool 21 has ear portions 34, for example, on both the left and right sides of the outer frame 25. The left and right ear portions 34 are provided on the outer sides of the left and right of the grooved pulley 24. In this example, the movable pulley 22 is configured to be able to open the left and right of the grooved pulley 24 so that the main rope 7 can be easily hung on the grooved pulley 24. One of the left and right ear portions 34 is provided on, for example, one of the side plates constituting the outer frame 25. At this time, the other of the left and right ear portions 34 is provided on one of the side plates constituting the outer frame 25. Each ear portion 34 may be provided on the same side plate, or one ear portion 34 may be provided on each of a pair of side plates. Note that the left and right ear portions 34 may be attached to the side plates of the outer frame 25 via, for example, a hinge 28.

[0062] In each of the left and right ear portions 34, holes are provided. The width between the holes in the left and right ear portions 34 is shorter than the width between the pair of balance weight guide rails 15. The width between the holes in the left and right ear portions 34 is about the diameter of the balance weight sheave 16. In this example, the width between the holes in the left and right ear portions 34 is shorter than the diameter of the balance weight sheave 16. One guide ring 23 is attached to be hung on the hole in the left ear portion 34. The other guide ring 23 is attached to be hung on the hole in the right ear portion 34.

[0063] When using this replacement auxiliary tool 21, the operator hangs the groove wheel 24 of the movable pulley 22 of the replacement auxiliary tool 21 on the folded-back portion 33 of the newly installed main rope 7a provided in the upper region. The operator hangs one guide ring 23 attached to the movable pulley 22 on the portion on the terminal device 11p side among the portions of the newly installed main rope 7a pulled out from the groove wheel 24 of the movable pulley 22, and on the portion on the terminal device 11p side among the portions of the existing main rope 7b arranged across the upper region and the lower region. The operator hangs the other guide ring 23 attached to the movable pulley 22 on the portion on the drum 32s side among the portions of the newly installed main rope 7a pulled out from the groove wheel 24 of the movable pulley 22, and on the portion on the terminal device 11q side among the portions of the existing main rope 7b arranged across the upper region and the lower region. At this time, since the movable pulley 22 is connected to the existing main rope 7b to which tension is applied on both the left and right sides by the guide rings 23 attached to both the left and right sides, the rotation around the vertical direction of the folded-back portion 33 is suppressed.

[0064] As described above, in the auxiliary tool attachment step of the method for replacing the main rope 7 of the elevator 1 according to the second embodiment, the operator hangs one guide ring 23 attached to the movable pulley 22 on each of the portions on both sides as viewed from the balance weight sheave 16 of the other main rope 7 to be replaced so as to suppress the rotation around the vertical direction of the folded-back portion 33. Also, in the main rope replacement aid 21 of the elevator 1 according to Embodiment 2, each guide ring 23 is attached to the movable pulley 22. The pair of guide rings 23 are respectively hung on both sides as viewed from the counterweight sheave 16 of the other main rope 7 to be replaced so as to suppress the rotation of the folded portion 33 around the vertical direction.

[0065] With such a configuration, since the pair of guide rings 23 are attached to the movable pulley 22, it becomes difficult for the guide rings 23 to interfere with the newly installed main rope 7 to be replaced. Also, it becomes difficult for the guide rings 23 to be caught in the groove wheel 24 together with the main rope 7 to be replaced that is hung on the groove wheel 24. Further, since the guide rings 23 are attached to the movable pulley 22, it becomes difficult for the guide rings 23 to be caught by the main rope 7 to be replaced or the other main rope 7 above the movable pulley 22. As a result, the replacement work of the main rope 7 can be performed more smoothly.

[0066] Note that the pair of guide rings 23 may be fixed to the movable pulley 22 or may be provided integrally with the movable pulley 22.

Industrial Applicability

[0067] The main rope replacement method according to the present disclosure can be applied to an elevator having a plurality of main ropes. The replacement aid according to the present disclosure can be applied to the replacement method.

Explanation of Signs

[0068] 1 Elevator, 2 Hoistway, 3 Landing, 4 Machine room, 5 Pit, 6 Hoisting machine, 7, 7a, 7b Main ropes, 8 Car, 9 Counterweight, 10 Deflector sheave, 11, 11p, 11q Terminal devices, 12 Car guide rail, 13 Car sheave, 14 Car guide shoe, 15 Counterweight guide rail, 16 Counterweight sheave, 17 Counterweight guide shoe, 18 Rod, 19 Spring, 20 Nut, 21 Replacement aid, 22 Movable pulley, 23 Guide ring, 24 Grooved pulley, 25 Outer frame, 26 Shaft portion, 27 Hook, 28 Hinge, 29 Chain block, 30 Pipe support, 31 Wire tensioner, 32s, 32t Drums, 33 Reversing section, 34 Ear portion, W, X, Y, Z Cutting points

Claims

1. Applied to an elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side and a second portion on the other side of each of the plurality of main ropes as viewed from the lower sheave are arranged across the upper region and the lower region in a hoistway. A method for replacing a main rope, An upper cutting step of cutting each of the first portion and the second portion of the existing first rope in the upper region; An upper arrangement step of replacing the existing first rope with a new first rope in the upper region and providing a folded-back portion hanging downward in the upper region; A wire tensioning step of applying tension to the first portion and the second portion of the second rope; After the upper arrangement step, in the upper region, hang a grooved wheel of a movable pulley on the folded-back portion of the newly installed first rope, and attach a first guide ring to the first portion of the first rope and the first portion of the second rope, and a second guide ring to the second portion of the first rope and the second portion of the second rope so as to suppress rotation of the folded-back portion around the vertical direction. An auxiliary tool attachment step; After the upper cutting step and the auxiliary tool attachment step, a connection step of connecting the portion of the existing first rope cut in the upper cutting step and arranged across the upper region and the lower region to the movable pulley in the upper region; After the wire tensioning step and the connection step, using the first portion to which the first guide ring of the second rope is attached and the second portion to which the second guide ring of the second rope is attached as guides, a installation and recovery step of lowering the folded-back portion of the newly installed first rope to the lower region while recovering the existing first rope in the lower region; After the installation and recovery step, a lower arrangement step of removing the folded-back portion of the newly installed first rope from the grooved wheel of the movable pulley and hanging it on the lower sheave in the lower region; A method for replacing a main rope of an elevator, comprising:

2. Applied to an elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side and a second portion on the other side of each of the plurality of main ropes as viewed from the lower sheave are arranged across the upper region and the lower region in a hoistway. This is a method for replacing the main ropes, An upper cutting step of cutting each of the first portion and the second portion of the existing first rope in the upper region, An upper arrangement step of replacing the existing first rope with a new first rope in the upper region and providing a folded-back portion hanging downward in the upper region, A wire tensioning step of applying tension to the first portion and the second portion of the second rope, After the upper arrangement step, in the upper region, hang the grooved wheel of the movable pulley on the folded-back portion of the newly installed first rope, and hang the first portion of the second rope on the first guide ring attached to the movable pulley and the second portion of the second rope on the second guide ring attached to the movable pulley so as to suppress rotation around the vertical direction of the folded-back portion. An auxiliary tool attachment step, After the upper cutting step and the auxiliary tool attachment step, a connection step of connecting the portion of the existing first rope cut in the upper cutting step and arranged across the upper region and the lower region to the movable pulley in the upper region, After the wire tensioning step and the connection step, using the first portion around which the first guide ring of the second rope is hung and the second portion around which the second guide ring of the second rope is hung as guides, while recovering the existing first rope in the lower region, lower the folded-back portion of the newly installed first rope to the lower region. An installation and recovery step, After the installation and recovery step, in the lower region, a lower arrangement step of removing the folded-back portion of the newly installed first rope from the grooved wheel of the movable pulley and hanging it on the lower sheave, A method for replacing the main ropes of an elevator, comprising:

3. The installation and recovery step includes a procedure of feeding out the first rope while rotating at least one end according to the length of the first rope fed out so as to suppress twisting due to the twist of the newly installed first rope. Method for replacing main ropes of an elevator according to claim 1 or claim 2.

4. Lower cutting step of cutting in the lower region so as to divide the first portion and the second portion of the existing second rope comprising The wire tensioning step is performed after the lower cutting step, and includes a procedure of applying tension to the first portion and the second portion of the existing second rope by pulling each of the cutting ends on the first portion side and the cutting ends on the second portion side of the existing second rope cut in the lower region in the lower cutting step. Method for replacing main ropes of an elevator according to claim 1 or claim 2.

5. The lower sheave is a sheave provided on the counterweight, The wire tensioning step includes a procedure of applying tension to the first portion and the second portion of the newly installed second rope by pulling the portion on the ascending side when the counterweight ascends, among the first portion and the second portion of the newly installed second rope. Method for replacing main ropes of an elevator according to claim 1 or claim 2.

6. An exchange aid used in a method for replacing main ropes, which is applied to an elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side and a second portion on the other side of each of the plurality of main ropes as viewed from the lower sheave are arranged across the upper region and the lower region in a hoistway. A grooved pulley on which a folded portion of the newly installed first rope hanging down from the upper region is hung, and a movable pulley having a connecting portion to which a portion of the existing first rope cut in the upper region and arranged across the upper region and the lower region is connected. A first guide ring hung on the first portion of the first rope and the first portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction. A second guide ring hung on the second portion of the first rope and the second portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction. An exchange aid for main ropes of an elevator comprising

7. An elevator in which both ends of each of a plurality of main ropes including a first rope and a second rope are fixed in an upper region, a lower sheave around which each of the plurality of main ropes is wound is in a lower region below the upper region, and a first portion on one side and a second portion on the other side of each of the plurality of main ropes as viewed from the lower sheave are arranged across the upper region and the lower region in a hoistway. The present invention relates to an exchange aid used in a method for exchanging a main rope performed in a state where the main rope is arranged, A sheave on which a folded portion of the newly installed first rope hanging downward from the upper region is hung, and a connection portion to which a portion of the existing first rope cut in the upper region and arranged across the upper region and the lower region is connected. A movable pulley having, A first guide ring attached to the movable pulley and hung on the first portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction, A second guide ring attached to the movable pulley and hung on the second portion of the second rope to which tension is applied so as to suppress rotation of the folded portion around the vertical direction, An elevator main rope exchange aid comprising.

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