JP2003034475A - Main rope replacing method of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main rope replacing method of an elevator capable of efficiently and economically replacing a main rope. SOLUTION: A holding position of a riding car 4 is not arranged in the vicinity of the uppermost floor, and is arranged in the vicinity of the lowest floor so that the main rope 6 in a car under pulley 4a can be hooked and removed from a bottom part 1a of a hoistway 1. A U-shaped part of the main rope 6 is respectively raised and lowered between the rope end 6a and a deflecting pulley 8a and between both deflecting pulleys 8a and 8b so that the existing main rope 6 can be easily pulled up, and a new main rope can be pulled down from a work scaffold 10 assembled in an upper part 1a of the hoistway 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a main rope of an elevator having no machine room at the top of a hoistway.

[0002]

2. Description of the Related Art Conventionally, a main rope replacing method in a 2: 1 roping type elevator having a machine room has been disclosed in Japanese Patent Laid-Open No. 249885/1990, in which a counterweight is provided at a lower portion of a hoistway. After holding the car and hoisting the car at the top of the hoistway with the car hoisting means, place the rope holding device above the counterweight to hold the existing main rope and then the end of the existing main rope from the rope stopper. Disconnect and connect the new main rope from the drum to the end, then disconnect the end on the car side from the rope stopper and attach the end to the drum, then operate the hoist at low speed While winding the main rope around the drum, unwind the new main rope from the drum, hang it around the new main rope in sequence, then disconnect the car-side end of the new main rope from the existing main rope and use it as a metal fitting. It continued to, and to connect the other end of the new main rope fittings.

On the other hand, in recent years, Japanese Patent Laid-Open No. 10-506
As disclosed in Japanese Patent Application No. 871 and Japanese Patent Application Laid-Open No. 11-130365, elevators having no machine room at the top of the hoistway have been proposed, and it is expected that the number of elevators of this kind will increase.

[0004]

However, when the conventional rope replacement method for a 2: 1 roping type elevator is applied to an elevator without a machine room, when the car is hoisted and held by the car hoisting means above the hoistway, Because the lower pulley of the car cannot be reached during work,
A replacement method that connects the old and new ropes is required, but
When connecting the old and new ropes, the diameter of the connecting part increases,
During replacement work, remove the rope stoppers for existing car pulleys on the lower part of the car, the sheave of the hoisting machine and the existing pulleys of the turning pulley, and install the rope stoppers for replacement according to the diameter of the connection part. I have to. In addition, the car must be moved to the lower part of the hoistway once in order to remove the pulley rope stopper before the car is held and to return it after the work is completed. In addition, since the number of rope feed resistance parts in the hoistway such as under-car pulley, turning pulley, and sheave increases more than in elevators with machine rooms, the force required to pull out the new main rope increases, and multiple work operations are performed. A person or a drawer assistance device is required, resulting in poor work efficiency and uneconomical.

An object of the present invention is to provide a method of replacing a main rope of an elevator, which enables easy and efficient replacement of the main rope.

[0006]

In order to achieve the above-mentioned object, the present invention connects both rope ends of an existing main rope near the top of a hoistway, and at least an intermediate portion of the existing main rope has a balance weight. , The sheave of the hoisting machine, and the sheave of the hoisting machine, and the lower car of the car that is driven by the hoisting machine to move up and down. In a method of replacing the existing main rope with a new main rope in a state of being held in a position, the car is held near the bottom of the hoistway and the counterweight is held near the top of the hoistway. In this state, remove the existing main rope from the lower car pulley and pull up the existing main rope in a U-shape from the work scaffold provided at the top of the hoistway. After cutting the existing main rope at a predetermined position and connecting one end of the new main rope to the cut end on the remaining side, lower the new main rope into a U shape from the work scaffold and place it on the car lower pulley. It is characterized by being hung around.

In the elevator main rope replacement method according to the present invention, the car is held near the bottom floor instead of near the top floor, so that the car does not move during the work, and the existing main rope hanging on the car pulley is carried out. Since the removal and return of the main rope can be performed from the bottom of the hoistway, the main rope can be replaced easily and efficiently.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an initial state of work of an elevator adopting a method of replacing a main rope of an elevator according to a first embodiment of the present invention.

An existing main rope 6 is hung on a sheave 7a of a hoisting machine 7 installed on the bottom 1a of the hoistway 1, and the rope end 6a side of the existing main rope 6 is a pulley beam 8 provided near the top 1b of the hoistway 1. After being hung on a turning pulley 8a provided on the vehicle, it is hung on a lower car pulley 4a provided on a lower portion of the car 4 and is connected to a rising pulley beam 8 by appropriate means. On the other hand, the rope end 6b side of the existing main rope 6 is hung on the turning pulley 8b provided on the pulley beam 8 and then connected to the rising pulley beam 8 by an appropriate means via the on-weight pulley 5a provided on the balance weight 5. ing. When the existing main ropes 6 are driven by the hoisting machine 7 in this way, the car 4 moves up and down along the guide rails 2 standing upright over the entire path of the hoistway 1, and at the same time, the balancing weights are opposed to the car 4. 5 moves up and down.

Next, the replacement work of the existing main rope 6 will be described.

First, as the first step, the top 1b of the hoistway 1
The work scaffolding 10 is located at a position where the rope ends 6a and 6b can be removed later in the vicinity and the newly-maintained main rope after replacement can be fixed.
Set up. Next, the worker lowers the car 4 to a position where a minimum clearance can be secured so that the car 1 can move in and out of the bottom 1a of the hoistway 1, and the car holding member 11 having a strength capable of holding the load of the car 4 is attached to the guide rail 2. It is fixed with bolts, and the car 4 is held by the car holding material 11.

Next, in the second step, the counterweight 5 is held by the holding wire rope 12 and the lifting means 13. That is, as shown in FIG. 2, the long operating rod 14 is lowered from the work scaffold 10 so that the hook-shaped tip of the operating rod 14 is passed through the opening of the rim 5b of the weight pulley 5a, and is held near it. After the front end of the operating rod 14 is locked to the distal end ring-shaped portion 12a of the working wire rope 12, the operating rod 14 is lifted while keeping this locked state, and the holding wire rope 12 is passed through the rim 5b of the weight pulley 5a. The worker pulls up this end. Subsequently, both ends of the holding wire rope 12 pulled up by the operator are engaged with the hoisting means 13 attached to the pulley beam 8, and then the hoisting means 13 is operated to make a specified clearance with respect to the position of the car 4. The counterweight 5 is hoisted and held up to a predetermined position above the hoistway 1 where

Next, the rope holder 15 is fixed to a strength member in the hoistway 1 such as the guide rail 2 or a building beam (not shown) at a position above the work scaffold 10, and the existing main rope 6 is fixed by the rope holder 15. It is temporarily held and prevents the existing main rope 6 from dropping by its own weight when the rope end 6a is removed. A rope clip 16 that is sufficiently larger than the groove of the turning pulley 8a and cannot pass through the turning pulley 8a is fixed to the existing main rope 6 located on the rope end 6a side of the turning pulley 8a. It prevents it from falling by its own weight in the direction.

Next, as a third step, the bottom 1a of the hoistway 1
After removing the existing main rope 6 from the car bottom pulley 4a and the sheave 7a of the hoisting machine 7, the rope end 6a near the upper part 1b of the hoistway 1 is unfixed, and as shown in FIG. The rope end 6a of the existing main rope 6 that has been removed is connected to the rope recovery drum 17 installed in the hall. afterwards,
From work scaffolding 10 to rope recovery drum 17 and turning pulley 8
The U-shaped portion of the existing main rope 6 hung on the car lower pulley 4a between a is pulled out upward, and the worker in the hall sequentially winds up the existing main rope 6 of this portion on the rope recovery drum 17. .

When the pulling out of the same portion is completed, the rope clip 16 is removed, and similarly, the existing main rope 6 of the U-shaped portion around which the sheave 7a of the hoisting machine 7 is wound between the turning pulley 8a and the turning pulley 8b. Pull out and collect with the rope recovery drum 17. When the collection of the U-shaped portion is completed, the U-shaped portion of the existing main rope 6 hung from the turning pulleys 8a, 8b to the on-weight pulley 5a of the counterweight 5 remains, but prior to the collection. The existing main rope 6 is cut by the rope collecting drum 17 of the turning pulley 8a.

Next, as a fourth step, the newly installed main rope is laid around. First, as shown in FIG. 4, the existing main rope 6
The existing main rope cutting portion 20 and the new main rope end portion 21 in the vicinity of the turning pulley 8a left at the time of the removal of the
After cutting each piece of paper and curing the ends with the vinyl tape 22, one of the strands 23 and 23b is folded back and hooked, and the folded back portion is bound to the binding line 2
Each of them is fixed by 4 and is cured by a vinyl tape 22 within a thickness range capable of passing through a gap for preventing the weight pulley 5a from coming off, thereby forming a connecting portion 25 shown in FIG. Then, the fixing at the rope end 6b of the existing main rope 6 is released, and the rope end 6b is pulled out into the hole until the above-mentioned connecting portion 25 comes out of the same portion of the pulley beam 8. Then, the connecting portion 25 is removed and the new main rope end is removed. The part 21 is connected to the pulley beam 8 near the top 1b of the hoistway 1.

Next, as a fifth step, the new main rope 27 is attached in the reverse order of the above-mentioned removal of the existing main rope 6. This is because, as shown in FIG. 6, the new main rope 27 located between the turning pulley 8a and the turning pulley 8b on the work scaffold 10 is pulled down, and the sheave 7a of the hoisting machine 7 arranged at the bottom 1a of the hoistway is pulled down. Work scaffolding 10 after hanging on
While tension is applied to the new main rope 27, the rope clip 16 is attached to the feed drum 26 side installed in the uppermost hall of the turning pulley 8a in the same manner as when removing the existing main rope 6.
To prevent the rope from falling in the direction of the hoisting machine 7 due to its own weight. Then, as shown in FIG. 7, the new main rope 27 located between the feed drum 26 and the turning pulley 8a is pulled down from the work scaffold 10 into a U-shape, and this U-shaped portion is moved from the bottom 1a of the hoistway 1 to the car lower position. The new main rope 27 at a position corresponding to the previously used rope holder 15 is temporarily held while being hung on the pulley 4a and being manually tensioned. In this state,
After cutting the new main rope 27 to a specified length and processing the terminal,
Connect the rope end 6a near the top 1b of the hoistway 1,
The work scaffold 10, the holding wire rope 12, the lifting means 13, and the rope holder 15 are removed to complete the main rope replacement work.

As described above, since the holding position of the car 4 is set not near the uppermost floor but near the lowermost floor, the bottom portion 1a of the hoistway 1 is
The main ropes 6 and 27 can be hung on and removed from the lower cage pulley 4a, and the replacement work can be performed easily and efficiently without moving the car during the work as in the conventional case. In addition, the rope end 6a and the turning pulley 8
Since the U-shaped portions of the main ropes 6 and 27 are raised and lowered between a and between the turning pulley 8a and the turning pulley 8b, respectively, the work scaffold 10 arranged on the top 1b of the hoistway 1 can be easily installed from the existing work scaffold 10. Pulling up the main rope 6,
It is possible to pull down the new main rope 27, and do not worry about the pulleys of the main ropes 6 and 27 coming off.
Since it is not necessary to use a drawer auxiliary device, the replacement work can be performed efficiently and economically. Further, in order to hold the counterweight 5 by the holding wire rope 12 and the lifting means 13, the holding wire rope 12 is attached to the weight pulley 5.
Since the operation rod 14 for passing through the rim 5b of a is used, the work scaffold 10 for the upper work can be performed by assembling only one stage, so that the work efficiency is further improved.

FIG. 8 is a cross-sectional view showing an initial working state of an elevator adopting the rope replacing method according to the second embodiment of the present invention.

In the above-described first embodiment, the hoisting machine 7 is arranged at the bottom portion 1a of the hoistway 1, but in the second embodiment, the hoisting machine 7 is provided on the beam 8 provided near the top portion 1b of the hoistway 1. It is supported, one rope end 6a of the existing main rope 6 is fixed to the beam 8, is hung up on the lower car pulley 4a, then is raised and wound around the sheave 7a of the hoisting machine 7, and then the balance weight 5 The other rope end 1b is fixed to the beam 8 via the weight pulley 5a.

When performing the main rope replacement work, first, as a first step, after the work scaffold 10 is installed near the top 1b of the hoistway 1 as in the first embodiment, the operator is allowed to set the bottom of the hoistway 1. The car 4 is lowered to a position where a minimum clearance for entering and exiting the car 1a is secured, and a car holding member 11 having a strength capable of holding the load of the car 4 is fixed to the guide rail 2 by bolts. Hold the car 4.

Next, in the second step, the balance weight 5 connected to the car 4 via the main rope 6 is held by the holding wire rope 12 and the lifting means 13. This holding is carried out by the embodiment described above. Do the same as in. After that, the rope holder 15 fixed to a strength member in the hoistway 1 such as a building beam temporarily holds the vicinity of one rope end 6a of the existing main rope 6.

Next, as the third step, the bottom 1a of the hoistway 1
After removing the hook of the main rope 6 from the pulley under the car 4a, the one end 6a of the existing main rope 6 is unfixed and removed to the rope collection drum 17 installed in the top floor hall as shown in FIG. And connect the rope end 6a. After that, the worker recovers the rope collecting drum 17 from the work scaffold 10.
And the U-shaped part of the existing main rope 6 located between the sheave 7a of the hoisting machine 7 and the U-shaped part of the existing main rope 6 lifted by the worker located in the hall. It winds up in sequence. When the pulling out of the U-shaped portion of the existing main rope 6 is completed, the rope collecting drum 17 side of the sheave 7a is cut, leaving the U-shaped portion wound around the counterweight pulley 5a of the counterweight 5. Remove 17

Next, as a fourth step, the newly installed main rope is laid around. First, as described with reference to FIG. 4, the existing main rope cutting portion 20 obtained by cutting the existing main rope 6 and the new main rope end portion 21 of the new main rope 27 wound around the feed drum 26 arranged in the top floor hall are provided. Connect in the same way
The connection portion 25 shown in FIG. Next, the remaining rope end 6b of the existing main rope 6 is unfixed, and the connecting portion 25
Passes through the sheave 7a and the weight pulley 5a, and the beam 8
The rope end 6b is pulled up from the hole side until it comes out to the upper part, then the connecting portion 25 is removed and the new main rope end portion 21 of the new main rope 27 is fixed to the beam 8.

Next, as a fifth step, in a procedure reverse to the removal work for the existing main ropes 6, as shown in FIG. 11, a worker from the work scaffold 10 winds around the lower car pulley 4a of the new main ropes 27. Is pulled down in a U-shape, and the operator from the bottom 1a of the hoistway hangs the new main rope 27 on the car lower pulley 4a, and holds the new main rope 27 with the above-mentioned rope holder 15 while tension is applied by hand. To do. afterwards,
After cutting the new main rope 27 to a predetermined length and performing terminal treatment, the rope end 6a of the new main rope 27 is connected to the beam 8, and the work scaffold 10, the holding wire rope 12, the lifting means 13 and the rope are connected. The holder 15 is removed to complete the main rope replacement work.

As described above, since the holding position of the car 4 is not near the uppermost floor but near the lowermost floor, the bottom portion 1a of the hoistway 1 is
The main ropes 6 and 27 can be hung up and removed from the lower basket pulley 4a, and the work can be performed easily and efficiently without moving the car during the work as in the conventional case. Further, since the U-shaped portions of the main ropes 6, 27 are raised and lowered between the rope end 6a and the sheave 7a of the hoisting machine 7, it is easy to use the existing scaffolding 10 from the work scaffolding 10 arranged near the top 1b of the hoistway 1. The rope 6 can be pulled up, the new main rope 27 can be pulled down, there is no need to worry about the pulleys of the main ropes 6 and 27 coming off, and it is not necessary to use a drawer auxiliary device, so efficient and economical replacement is possible. You can work. Further, the counterweight 5 is attached to the holding wire rope 12 and the lifting means 1
Since the operation rod 14 for passing the holding wire rope 12 through the rim 5b of the on-weight pulley 5a is used to hold the work scaffolding 3 in the same manner as in the first embodiment, the work scaffold 10 for upper work is assembled in only one stage. Since it can be done only by itself, work efficiency is further improved. Thus, the hoisting machine 7 can be applied to the main rope replacement of the elevator installed on the top 1b in the hoistway 1 without forming a machine room at the top of the hoistway 1.

In the above-mentioned embodiment, the car 4 is held by using the car holding member 11 fixed to the guide rail 2 by bolts. However, the bracket having the engaging portion at the upper position of the car 4 May be fixed to the guide rail 2 and the cord-like body locked to this bracket may be held by hanging it on the lower part of the car 4.

In the above-described first embodiment of the present invention, the operation for removing the tail cord has been described as a premise. However, if there is a possibility of wiring failure with the connector due to the insertion / removal of the tail cord, the removal / attachment of the tail cord is performed. Instead, the rope may be replaced. The third embodiment of the present invention thus performed will be described with reference to FIGS.

For the third step of the first embodiment of the present invention, at the bottom 1a of the hoistway 1, as shown in FIG.
The existing main rope 6 hanging on a is temporarily cut, the hanging from the under car pulley 4a is removed to avoid the tail cord 28, and the cut end is reconnected by the rope connecting means 29 as shown in FIG. After that, after removing the hook of the existing main rope 6 from the sheave 7a of the hoisting machine 7, the same operation as in the first embodiment of the present invention is performed.

For the fifth step, first, like the new main rope attaching work of the first embodiment of the present invention, the new main rope located between the turning pulley 8a and the turning pulley 8b on the work scaffolding 10 shown in FIG. After pulling down 27 and hanging it on the sheave 7a of the hoisting machine 7 arranged at the bottom 1a of the hoistway 1, the existing rope 6 is removed while tension is applied to the new main rope 27 by the work scaffold 10. Turning pulley 8a as at the time
The rope clip 16 is fixed to the side of the feed drum 26 installed in the hall on the uppermost floor in order to prevent the rope clip 16 from dropping toward the hoisting machine 7 due to its own weight. Next, when the new main rope 27 cannot be lowered by the tail cord 28 of the car 4, all the new main rope 27 between the rope end 6 and the turning pulley 8a is placed on the bottom 1a of the hoistway 1 as shown in FIG. After pulling down and hanging on the lower car pulley 4a, the rope end 6 is pulled up to the top 1b of the hoistway 1 and tension is manually applied to temporarily hold the new main rope 27 at a position corresponding to the rope e jig 15.
The subsequent steps are similar to those of the first embodiment of the present invention.

As described above, by performing the operations of the third step and the fifth step, the tail cord 28 of the car 4 pulls up the existing main rope 6 between the rope end 6a and the turning pulley 8a in a U-shape to newly install it. Even if the main rope 27 cannot be lowered, the main rope can be replaced by adopting the third embodiment.

Also, in the second embodiment of the present invention,
Although the operation for removing the tail cord 28 has been described as a premise, the rope may be exchanged without inserting / removing the tail cord 28 if there is a possibility of a wiring failure with the connector due to the insertion / removal of the tail cord 28. The fourth embodiment of the present invention thus performed will be described with reference to FIGS.

As compared with the third step of the second embodiment of the present invention, at the bottom 1a of the hoistway 1, as shown in FIG.
The existing main rope 6 hanging on a is temporarily cut, the hanging from the car lower pulley 4a is removed to avoid the tail cord 28, and the cut end is reconnected by the rope connecting means 29 as shown in FIG. After that, the work of the third step is performed in the same manner as in the second embodiment of the present invention.

For the fifth step, similar to the new main rope attaching work of the second embodiment of the present invention, the new main rope between the rope end 6 and the turning pulley 8a is shown from the work scaffold 10 shown in FIG. All the ropes 27 are pulled down to the bottom 1a of the hoistway 1 and hung on the lower car pulley 4a, and then the rope end 6 is pulled up to the top 1b of the hoistway 1 and tension is applied by hand to newly install a position corresponding to the rope holder 15. The rope 27 is temporarily held. The subsequent steps are the same as those in the second embodiment described above. In this way, by performing the operations of the third step and the fifth step, the tail cord 28 of the car 4 pulls up the existing main rope 6 between the rope end 6a and the turning pulley 8a in a U shape, and the new main rope 27 Even if it is impossible to unload the main rope, the main rope replacement work can be performed by adopting the fourth embodiment.

[0036]

As described above, in the method of replacing the main rope of the elevator according to the present invention, the car holding position is not near the uppermost floor but near the lowermost floor. Since the main rope can be hung from the bottom of the hoistway, it is possible to perform the replacement work easily and efficiently without moving the car during the work as in the conventional case.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an initial working state of an elevator adopting a method of replacing an elevator main rope according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of essential parts showing an intermediate state of operation of an elevator that employs the method of replacing the main rope of the elevator shown in FIG.

FIG. 3 is a cross-sectional view showing another state in which the elevator adopting the method of replacing the main rope of the elevator shown in FIG. 1 is in the middle of another operation.

FIG. 4 is an enlarged front view showing a connecting portion between an existing main rope and a new main rope of an elevator adopting the elevator main rope replacement method shown in FIG. 1.

FIG. 5 is a cross-sectional view showing still another working state of the elevator adopting the method of replacing the main rope of the elevator shown in FIG. 1.

FIG. 6 is a cross-sectional view showing still another working state of the elevator adopting the method of replacing the main rope of the elevator shown in FIG. 1.

FIG. 7 is a cross-sectional view showing an end-of-work state of an elevator adopting the elevator main rope replacement method shown in FIG.

FIG. 8 is a cross-sectional view showing an initial working state of an elevator that employs a method of replacing an elevator main rope according to a second embodiment of the present invention.

9 is a cross-sectional view showing an intermediate state of operation of an elevator adopting the elevator main rope replacement method shown in FIG.

FIG. 10 is a cross-sectional view showing another state of work in progress of the elevator adopting the method of replacing the main rope of the elevator shown in FIG.

11 is a cross-sectional view showing an end-of-work state of an elevator adopting the elevator main rope replacement method shown in FIG.

FIG. 12 is a cross-sectional view showing an intermediate state of operation of an elevator adopting the main rope replacement method according to the third embodiment of the present invention.

FIG. 13 is a cross-sectional view showing another state in which the elevator adopting the main rope replacing method according to the third embodiment of the present invention is in the middle of another operation.

FIG. 14 is a cross-sectional view showing still another midway work state of the elevator adopting the main rope replacing method according to the third embodiment of the present invention.

FIG. 15 is a cross-sectional view showing an intermediate state of operation of an elevator adopting the main rope replacement method according to the fourth embodiment of the present invention.

FIG. 16 is a cross-sectional view showing another state in which the elevator adopting the main rope replacing method according to the fourth embodiment of the present invention is in the middle of another operation.

FIG. 17 is a cross-sectional view showing still another working state of the elevator adopting the main rope replacing method according to the fourth embodiment of the present invention.

[Explanation of symbols]

1 hoistway 1a bottom 1b top 4 car 4a Lower basket pulley 5 Counterweight 6 Existing main rope 6a, 6b rope end 7 Hoisting machine 7a sheave 10 working scaffolds 12 Holding wire rope 13 Lifting means 14 Control rod 23a, 23b Strand 27 New main rope 28 tail cord

Continued front page    (72) Inventor Mizuki Gomi             6-6 Kandanishikicho, Chiyoda-ku, Tokyo             Inside the Hitachi Building System (72) Inventor Koji Inoue             6-6 Kandanishikicho, Chiyoda-ku, Tokyo             Inside the Hitachi Building System (72) Inventor Akihiro Takeuchi             1-1 1-1 Higashitaga-cho, Hitachi-shi, Ibaraki             Inside Titaga Technology Co., Ltd. (72) Inventor Kiyoshi Naganuma             6-6 Kandanishikicho, Chiyoda-ku, Tokyo             Inside the Hitachi Building System (72) Inventor Koji Yamashita             6-6 Kandanishikicho, Chiyoda-ku, Tokyo             Inside the Hitachi Building System (72) Inventor Noriyuki Sabota             6-6 Kandanishikicho, Chiyoda-ku, Tokyo             Inside the Hitachi Building System F term (reference) 3F305 BA03 BB02 BB19 DA11 DA15

Claims (7)

[Claims] 1. An overhead main pulley, wherein both ends of an existing main rope are connected near the top of a hoistway, and an intermediate portion of the existing main rope is provided with a hoisting pulley provided at least above a counterweight and a sheave of a hoisting machine. , The existing main rope is replaced with a new main rope while the car and the counterweight are held in place by being hung around the car lower pulley installed at the bottom of the car that is driven by this hoist to go up and down. In the elevator main rope replacement method described above, the car is held near the lower part of the hoistway, and the counterweight is held near the upper part of the hoistway. Remove the main rope from the main scaffolding provided above the hoistway and remove the existing main rope
Pull up in a letter shape, cut a predetermined position of the existing main rope, connect one end of the new main rope to the cut end on the remaining side, and then lower the new main rope in a U shape from the work scaffolding. A method for replacing the main rope of an elevator, characterized in that it is hung around the pulley under the car. 2. The hoisting machine according to claim 1, wherein the hoisting machine is arranged at the bottom of the hoistway, and both sides of the existing main rope hung on the sheave of the hoisting machine are near the top of the hoistway. The main rope replacement method for an elevator, characterized in that the predetermined position at which the existing main rope is cut by being hung on each of the turning pulleys provided on the above is the car lower pulley side of both the turning pulleys. 3. The existing main rope according to claim 1, wherein the existing main rope is hung around the counterweight held near the upper part of the hoistway and removed leaving a U-shaped portion, and the remaining existing rope is removed. Connect one end of the new main rope to the end of the main rope, fix one end of the new main rope near the top of the hoistway while collecting the existing main rope, and then attach the new main rope from the work scaffolding to the U A method for exchanging a main rope of an elevator, characterized in that the rope is lowered into a letter shape and hung around the pulley under the car. 4. The connection between the existing main rope and the new main rope according to claim 1, wherein at least one strand of each rope is folded back and hooked, and the hooked portion is cured to have a predetermined thickness. Main rope replacement method for elevators. 5. The balancing weight according to claim 1, wherein the holding wire rope is locked to a predetermined portion of the balancing weight from the working scaffold by using a long operating rod, and the holding wire is retained. A method of exchanging a main rope of an elevator, characterized in that the counterweight is held by a lifting means via a rope. 6. The rope according to claim 1, wherein the existing main rope is pulled up after the rope hanging on the lower portion of the car is temporarily cut and the rope under the car pulley is unhooked. A method for replacing a main rope of an elevator, characterized in that the cut ends of the rope are connected to each other and pulled up in a U-shape. 7. The method according to claim 1, wherein, when the new main rope is hung on the car lower pulley, all the rope is pulled down to the lower part of the hoistway, and the end of the new main rope is hung on the pulley under the car. After that, the main rope replacing method for an elevator is characterized in that the end portion of the new main rope is pulled up to the upper part of the hoistway.