JPH06239565A - Main rope replacing method for elevator - Google Patents

Abstract

PURPOSE:To provide a main rope replacing method for an elevator in which a main rope is efficiently replaced by few workers without damaging a newly installed main rope. CONSTITUTION:The upper part of a car 6 and a balancing weight 9 are stopped in a given position and by operating an existing emergency stop device, the car 6 is fixed to a guide rail. The existing main cable 7 is divided into two groups. The existing main cable 7a of one group of the two groups is shrunk by means of a chain block 33 to slacken the existing main ropes 7b and 7c of the other group, and the existing main ropes 7b and 7c are exchanged with newly installed main ropes 20b and 20c. Thereafter, the existing main rope 7a of one group is exchanged with a newly installed main rope 20a in a state that initial elongation of the newly installed main ropes 20b and 20c is absorbed by means of hydraulic jacks 44b and 44c arranged to the end parts of the newly installed main ropes 20b and 20c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator main rope replacement method for replacing an existing elevator main rope with a new main rope.

[0002]

2. Description of the Related Art A conventional method for replacing the main ropes of an elevator is
For example, it is disclosed in Japanese Patent Laid-Open No. 62-264182, which will be described with reference to the cross-sectional view of the hoistway shown in FIG.
A hoisting machine 4 arranged on a machine base 3 is provided in a machine room 1 formed above the hoistway 2, and a main rope 7 is wound around a sheave 5 of the hoisting machine 4. One end of the main rope 7 is inserted into a rope hole 26 in the floor of the machine room 1 and is connected to a car frame 12 of the car 6, more specifically to an upper beam 12a, via a main rope holding rod (not shown in detail). On the other hand, the other end is connected to the counterweight 9 via the main rope holding rod 8 similar to that described above. The pit 2a at the bottom of the hoistway 2 has a car 6
The car shock absorber 10 provided corresponding to 1 and the counterweight shock absorber 11 provided corresponding to the counterweight 9 are installed. The conventional existing main rope 7 in the elevator having such a configuration is replaced by the new main rope 20 by the following procedure.

First, the worker 21 gets on the car 6, and while driving the car 6, the upper part of the car 6 and the upper part of the counterweight 9 are located at substantially the same position. Main rope holding rods 8 are fixed to both ends of the existing main rope 7, and are connected to the car 6 and the counterweight 9 through the main rope holding rods 8.
Set the adjustment allowance to the maximum and lower the positions of the car 6 and the counterweight 9 a little. Next, the car 6 is driven to stop at the hall 22 on the top floor. At this time, the levels of the sill of the car 6 and the sill of the hall 22 on the top floor are matched, and in this state, the distance A between the counterweight 9 and the shock absorber 11 and the current length X of the existing main rope 7 are measured. To do. Thus, the length L of the newly installed main rope 20 is calculated from the following mathematical expression (1).

L = (X + 2D) − (B−A) (1) Here, B is the distance between the counterweight 9 and the shock absorber 11 set after the new main rope 20 is replaced, and D is the new installation. This shows the length required for terminal processing of the main rope 20.
The new main rope 20 is cut to a length L calculated by this formula, and a space piece 23 having the same length as the space A is inserted in the space between the counterweight 9 and the shock absorber 11, and then the pit 2a.
A scaffold 24 for replacing the main rope holding rod 8 above the counterweight 9 is set.

Next, the other end of the hoisting rope 25, one end of which is fixed to the machine base 3, is hung from the rope hole 26, the chain block 27 is connected to the lower end thereof, and the chain block 27 is connected to the upper beam 12a. Suspend the car 6.
After replacing with the new main rope 20, the counterweight 9 and the shock absorber 11
In order to make the interval between and the initial dimension B, the chain block 27 is operated to lift the car 6 by (BA).

After this, all the existing main ropes 7 are removed from the main rope holding rods 8 above the car 6 and the counterweight 9. Next, the operator 29 in the machine room 1 winds up the existing main ropes 7 one by one into the machine room 1, and after all the existing main ropes 7 are wound up, the worker 29 makes the new main ropes 20 one by one in the machine room. One end is dropped onto the car 6 and the other end is dropped onto the counterweight 9 from above. Next, the worker 21 on the car 6 connects the new main rope 20 to the main rope holding rod 8 on the car 6 side, and the worker 28 on the scaffold 24 balances the main rope holding rod 8 on the weight 9 side. The new main rope 20 is connected. In this way, the existing main rope 7 is replaced with the new main rope 20.

After the above work is completed, the chain block 2
7, lifting rope 25, spacing piece 23 and scaffold 24
To remove. Finally, the car 6 is operated, the car 6 is stopped so that the upper part of the car 6 and the upper part of the counterweight 9 are almost at the same position, the tension of the new main rope 20 is adjusted, and then the normal operation is performed. Finish the work.

[0008]

In the conventional elevator main rope replacement method as described above, the operator 2 in the machine room 1
9 winds up all the existing main ropes 7 in the machine room 1, and then one new main rope 20 from the machine room 1 at one end onto the car 6,
Since the other end is lowered onto the counterweight 9, the work efficiency is very poor. In addition, since the main rope is soaked with oil, it is slippery, and the old main rope may have broken wires, which may cause hand injury. Needed to be increased. Also,
Since the car 6 is suspended and fixed by the lifting rope 25 having one end fixed to the machine base 3 of the machine room 1, the existing main ropes 7 are replaced, so that the operator must operate the machine room 1, the car 6 and In order to secure the safety of the worker 28 on the pit 2a, a total of three or more persons are required for the scaffold 24 of the pit 2a.
Since the scaffold 24 must be installed, a large amount of work time for preparation is required to replace the existing main ropes, which is a great inconvenience for elevator users.

In order to improve these points, a plurality of existing main ropes are divided into two groups, one of the existing main ropes is shortened by a chain block and the other main rope is loosened, In this state, replace the existing main rope of the other group with the new main rope, then shorten the new main rope with the chain block to loosen the existing main rope of one group, and in this state, replace the existing main rope of one group. A method of replacing the main ropes of an elevator has been proposed in which the ropes are replaced with new main ropes. However, since the new main ropes are also chain-blocked, there is a risk of damaging the new main ropes.

An object of the present invention is to provide a method of replacing the main ropes of an elevator, which can be efficiently performed by a small number of workers and without damaging the new main ropes.

[0011]

In order to achieve the above object, the present invention has a plurality of existing main ropes wound around a sheave of a hoisting machine and a cover connected to at least one end of the existing main ropes. In an elevator main rope exchange method for exchanging the existing main rope with a new main rope, the existing main rope is divided into two groups, and the existing main rope of one of the groups is chained. In the state in which the existing main rope of the other group is loosened by contracting with a block, and in this state the existing main rope of the other group is replaced with a new main rope,
After that, the existing main rope of the one group is replaced with the new main rope while absorbing the initial extension of the new main rope by the hydraulic jack provided at the other end of the replaced new main rope. It is characterized by doing so.

[0012]

In the elevator main rope exchanging method according to the present invention, one of the new main ropes of the other group is absorbed by the hydraulic jack provided at the end of the new main rope. Since the existing main rope of the group is replaced with the new main rope, it is not necessary to directly hook the new main rope with the chain block, the main rope of the elevator can be replaced without damaging the new main rope, and the existing main rope can be used. Since the object to be lifted and lowered is suspended, there is no need to provide a special device or rope, so that a small number of workers can easily perform the work.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of the hoistway. As in the conventional example, a machine room 1 formed above the hoistway 2 is provided with a hoisting machine 4 arranged on a machine base 3. An existing main rope 7 is wound around the sheave 5. One end of the existing main rope 7 is the machine room 1
Is connected to the car frame 12 of the car 6 via a main rope holding rod (not shown in detail) which is inserted into the rope hole 26 in the floor portion of the vehicle, while the other end is the same main rope holding rod as that described above. It is connected to the counterweight 9 via 8.

The replacement of the existing main ropes 7 in the elevator having such a structure is carried out by the procedure shown in FIG. 5, which is a flow chart showing the replacement work procedure. Here, the number of main ropes is three, and the case where the worker 36 is arranged on the car 6 is shown. First, in step S1, the adjustment allowance of the main rope holding rod 8 is set to the maximum. That is, as shown in FIG. 1, the worker 36 gets on the car 6, and the upper part of the car 9 and the upper part of the counterweight 9 are at substantially the same position, or the upper part of the counterweight 9 is a predetermined size. After stopping the car 6 at a predetermined position higher than the upper part, the adjustment allowance of the main rope holding rod 8 is set to the maximum. Next, step S2
Then, drive the car 6 to stop at the hall 22 on the top floor,
The sill of the car 6 and the sill of the hall 22 on the top floor are set at the same position, and in this state, the space A between the counterweight 9 and the shock absorber 11 is set, and the new space B is set to a predetermined size. The lifting allowance (BA) of the counterweight 9 is determined.

Next, in step S3, the car 6 is operated again, and the car 6 is stopped at a predetermined position where the upper part of the counterweight 9 is higher than the upper part of the car 6, as shown in FIG.
The car 6 is fixed by activating an emergency stop device (not shown). In this state, as step S4, the three existing main ropes 7 are divided into two groups, and at least one existing main rope 7a, which is one of the groups, is attached to the counterweight 9 side, and an enlarged view of an essential part of FIG. As shown in FIG. 2, the gripping tool 31 for gripping the main rope is attached from the main rope holding rod 8 with a predetermined distance, and the other gripping tool 32 is attached above it. Next, the grasping tools 31 and 32 are connected by a chain block 33, and the chain block 33 is operated as shown in FIG.
Lift the counterweight 9 by the size corresponding to A),
In this way, the car 6 by the emergency stop device and the existing main rope 7a.
And supporting the counterweight 9.

At this time, the existing main ropes 7 of the other group
As shown in FIG. 2, the tension is eliminated and b and 7c are in a slackened state. Therefore, as step S5, the existing main rope 7b is first removed from the main rope holding rod 8 above the car 6 and the counterweight 9. As shown in FIG. 4, the main rope winding jig 34 is attached to the upper beam 12a of the car 6, and the main rope connecting jig 35 is attached to one end of the new main rope 20b wound around the main rope winding jig 34. Using this, one end of the existing main rope 7b is connected.
The main rope connecting jig 35 is called a gripper in which two strands of wire are braided in a lattice cylinder shape and each end of the strand is fixed, and usually the axial length is shortened to increase the outer diameter. But,
After connecting the existing main rope 7b and the new main rope 20b, a tension load is applied to reduce the outer diameter and extend the axial length. At this time, one end of the existing main rope 7b connected to the new main rope 20b is
Either side of the car 6 side or the counterweight 9 side may be used. Further, the other end of the existing main rope 7b is attached to the main rope winding jig 34 to wind the existing main rope 7b and to install the new main rope 2b.
0b is sent out at the same time, both ends of the new main rope 20b are connected to the main rope holding rods 8 on the car 6 side and the counterweight 9 side, respectively, and the existing main rope 7b is replaced with the new main rope 20. The same operation as described above is repeated to replace the remaining existing main ropes 7c with new main ropes.

Next, as step S6, the chain block 33 is operated to loosen the tension of the existing main rope 7a to which the grippers 31, 32 are attached, whereby the car 6 and the counterweight 9 are already attached to the new main ropes 20b, 20c. The existing main rope 7a, which is suspended and supported by the main rope holding rod 8 with the maximum adjustment allowance, is in a loosened state. Therefore, as step S7,
The existing main rope 7a is replaced with the new main rope 20a by the same method as the above-mentioned existing main rope 7b.
Since the load of the counterweight 9 has already been applied to b and 20c and the initial elongation has once occurred, and the load has become longer than the last-installed new main rope 20a, the main rope holding rod 8 of the new main rope 20a to be finally exchanged There is not enough dimension to travel from the frame 9a of the counterweight 9, and the adjustment spring 45a cannot be attached. Therefore, as shown in FIG. 6, the extension rods 43b and 43c and the nuts 42b and 42c are attached to the end portions of the main rope holding rods 8 of the new main ropes 20b and 20c which have been previously exchanged.
And hydraulic jacks 44b, 4 having cylinders 41b, 41c
4c respectively, hydraulic jacks 44b, 44c
To operate the main rope holding rods 8 of the new main ropes 20b and 20c.
The frame body 9a of the counterweight 9 which is counterbalanced with the anti-main rope connecting end is moved in a direction away from each other, and the initial extension amount of the new main ropes 20b and 20c is absorbed. In this state, finally the new main rope 20a
7, the main rope holding rod 8 can secure a sufficient dimension to travel from the frame 9a of the counterweight 9 as shown in FIG. 7, and the adjusting spring 45a can be attached. In this way, the existing main rope 7a of one group is replaced with the new main rope 2
When replacing with 0a, new main ropes 20b, 2
New main ropes 20 using chain block hung on 0c
Since the b and 20c are not contracted, the new main ropes 20b and 20c are not damaged. After that, the extension rods 43b and 43c, the nuts 42b and 42c, and the cylindrical body 4
Remove the hydraulic jacks 44b, 44c having 1b, 41c. In this way, all existing main ropes 7 are new main ropes 2.
It is replaced with 0, and finally, the tension of the new main rope 20 is adjusted to shift to normal operation.

In this way, the car 6 is fixed to the guide rail by the existing emergency stop device, and the balance weight 9 is temporarily supported by using the fixed car 6 and the existing main rope 7a. The car 6 and the counterweight 9 can be easily and easily supported. Further, the main rope winding jig 34 is attached to the upper beam 10a of the car 6, the new main rope 20 is attached thereto, and the new main rope 20 and the existing main rope 7 are attached.
Since the new main rope 20 is fed out while the existing main rope 7 is wound by the main rope winding jig 34, the main rope can be moved only in one direction at this time. You can work on the car without touching the main ropes directly, eliminating the risk of dropping the main ropes or injuring your hands. Further, since one of the workers 36 can replace the main rope, the labor can be greatly saved. Moreover, since the installation work of the scaffold 24 shown in FIG. 8 which is conventionally required is not required, not only the work efficiency is improved, but also the work time is shortened and the non-stop time of the elevator is shortened, which is less inconvenient for the worker. But it can be resolved. Further, after the main rope is replaced, the tension of the main rope can be adjusted without moving the car 6, which is safe.

In the above embodiment, two new main ropes 2 are used.
The new main rope 20 is attached to the end of the main rope holding rod 8 of 0b, 20c.
Hydraulic jack 44 that absorbs the initial elongation of b and 20c
b, 44c are attached, but one, for example, new main rope 2
The same effect can be obtained even if the hydraulic jack 44b that absorbs the initial extension of the new main rope 20b is attached only to the main rope holding rod 8 of 0b. Further, although the gripping tools 31 and 32 for gripping the main ropes are attached to the counterweight 9 side, the same effect can be obtained even if the gripping tools 31 and 32 are attached to the car 9 side. Furthermore, even if the suspended object is only a car such as a hydraulic elevator, the hydraulic jack 44 can be installed on the car side.
The same effect can be obtained by providing b and 44c.

[0020]

As described above, according to the present invention, the existing main ropes are divided into two groups, and the existing main ropes of one group are contracted more than the other existing main ropes to suspend the suspended object. The existing main rope of the other group loosened due to this is replaced with the new main rope, and then the initial extension of the new main rope is absorbed by the hydraulic jack provided at the end of the new main rope of the other group. In this state, the existing main rope of one group was replaced with the new main rope, so that a small number of workers could work, and since the hydraulic jack was used, it was necessary to directly apply the chain block to the new main rope. In addition, the main rope of the elevator can be replaced without damaging the new main rope.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a hoistway showing an intermediate state of a method of replacing a main rope of an elevator according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of FIG.

FIG. 3 is an enlarged side view of an essential part showing another working state of the method of replacing the main ropes of an elevator according to an embodiment of the present invention.

FIG. 4 is an enlarged side view of an essential part showing still another working state of the method of replacing the main ropes of the elevator according to the embodiment of the present invention.

FIG. 5 is a flow chart showing a method of exchanging main ropes of an elevator according to an embodiment of the present invention.

FIG. 6 is an enlarged side view of an essential part showing still another working state of the method of replacing the main ropes of the elevator according to the embodiment of the present invention.

FIG. 7 is an enlarged side view of an essential part showing still another working state of the method of replacing the main ropes of the elevator according to the embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view of a hoistway showing a conventional method of exchanging main ropes of an elevator.

[Explanation of symbols]

 4 Hoisting machine 6 Car 7 Existing main rope 9 Balancing weight 20 New main rope 44 Hydraulic jack

Claims (1)

[Claims] 1. A plurality of existing main ropes wound around a sheave of a hoisting machine, and an object to be lifted up and down connected to at least one end of the existing main ropes. The existing main rope is newly installed. In the method of replacing the main ropes of the elevator to be replaced with the main ropes, the existing main ropes are divided into two groups, and the existing main ropes of one of the groups are shortened by a chain block to replace the existing main ropes of the other group. In the loosened state, the existing main rope of the other group is replaced with a new main rope in this state, and then the new main rope is replaced by a hydraulic jack provided at the end of the replaced new main rope. The main rope replacement method for an elevator, wherein the existing main rope of the one group is replaced with the new main rope in a state where the initial extension of the above is absorbed.