Elevator equipment and repair method thereof

Abstract

In an elevator system, a hoist is designed to raise and lower a car via a plurality of old wire ropes that were wound around a drive sheave before being replaced with a plurality of new wire ropes. The tensile strength of each new wire rope is higher than the tensile strength of each old wire rope. The difference between the unit mass of each new wire rope and the unit mass of each old wire rope and the difference between the diameter of each new wire rope and the unit mass of each old wire rope are within a range that does not require replacement of the hoist when the ropes are replaced.

Description

[Technical field]

[0001] The present disclosure relates to elevator systems and methods for retrofitting the same. [Background technology]

[0002] In a conventional elevator wire rope, multiple steel side strands are arranged around the core, and multiple steel auxiliary strands are arranged around the layer made up of the multiple side strands (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-237908 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional elevator wire ropes described above, multiple auxiliary strands are added to increase the life span and strength, resulting in a high filling rate of steel wires in the wire rope and a high unit mass. Therefore, if a method of replacing an existing wire rope that does not have auxiliary strands with a wire rope that has auxiliary strands is selected to improve the performance, it is necessary to replace peripheral equipment such as a hoist, and improving the performance of the wire rope is not easy.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an elevator apparatus and a repair method thereof that can easily improve the performance of the wire rope. [Means for solving the problem]

[0006] The elevator apparatus of the present disclosure has a plurality of new wire ropes, a car suspended in a hoistway by the plurality of new wire ropes, and a drive sheave around which the plurality of new wire ropes are wound, and is equipped with a hoist that raises and lowers the car via the plurality of new wire ropes, and the hoist is designed to raise and lower the car via the plurality of old wire ropes, which are wire ropes that were wound around the drive sheave before being replaced with the plurality of new wire ropes, and the tensile strength of each new wire rope is higher than the tensile strength of each old wire rope, and the difference between the unit mass of each new wire rope and the unit mass of each old wire rope and the difference between the diameter of each new wire rope and the diameter of each old wire rope are each within a range that does not require replacement of the hoist when the rope is replaced. The elevator equipment renovation method of the present disclosure includes a rope replacement process for replacing multiple old wire ropes wound around the drive sheave of a hoist with multiple new wire ropes, wherein the tensile strength of each new wire rope is higher than the tensile strength of each old wire rope, and the difference between the unit mass of each new wire rope and the unit mass of each old wire rope, and the difference between the diameter of each new wire rope and the diameter of each old wire rope, are each within a range that does not require replacement of the hoist due to rope replacement. Effect of the Invention

[0007] According to the present disclosure, the performance of wire ropes can be easily improved. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing an elevator device according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the new wire rope of FIG. 1. [Diagram 3] FIG. 2 is a cross-sectional view of an old wire rope according to the first embodiment. [Figure 4] A cross-sectional view showing a first modified example of the new wire rope according to embodiment 1. [Diagram 5] A cross-sectional view showing a second modified example of the new wire rope according to embodiment 1. [Figure 6] A cross-sectional view showing a third modified example of the new wire rope according to embodiment 1. [Figure 7] A cross-sectional view showing a fourth modified example of the new wire rope according to embodiment 1. [Figure 8] A cross-sectional view showing a fifth modified example of the new wire rope according to embodiment 1. [Figure 9] A cross-sectional view showing a sixth modified example of the new wire rope according to embodiment 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1 Fig. 1 is a schematic configuration diagram showing an elevator device according to embodiment 1. In Fig. 1, a machine room 2 is provided above a hoistway 1. In the machine room 2, a hoisting machine 3 and a deflector sheave 6 are installed.

[0010] The hoist 3 has a hoist motor 4, a hoist brake (not shown), and a drive sheave 5. The hoist motor 4 rotates the drive sheave 5. The hoist brake keeps the drive sheave 5 stationary. In addition, the hoist brake brakes the rotation of the drive sheave 5.

[0011] A plurality of new wire ropes 7 are wound around the drive sheave 5 and the deflector sheave 6. In FIG. 1, only one new wire rope 7 is shown.

[0012] The car 8 and counterweight 9 are suspended in the hoistway 1 by multiple new wire ropes 7. The car 8 and counterweight 9 are raised and lowered in the hoistway 1 by rotating the drive sheave 5. That is, the hoisting machine 3 raises and lowers the car 8 and counterweight 9 via the multiple new wire ropes 7.

[0013] A pair of car guide rails 10 and a pair of counterweight guide rails 11 are installed in the hoistway 1. In Fig. 1, only the car guide rail 10 on one side and the counterweight guide rail 11 on the other side are shown.

[0014] A pair of car guide rails 10 guide the car 8 as it rises and falls. A pair of counterweight guide rails 11 guide the counterweight 9 as it rises and falls.

[0015] The car 8 has a car frame 12 and a car chamber 13. A plurality of new wire ropes 7 are connected to the car frame 12. The car chamber 13 is supported by the car frame 12.

[0016] Figure 2 is a cross-sectional view of the new wire rope 7 of Figure 1, showing a cross section perpendicular to the longitudinal direction of the old wire rope. The new wire rope 7 is an 8xS(21) type rope. The new wire rope 7 has a new rope core 31 and multiple new steel strands 32.

[0017] Natural fibers may be used as the material for the new rope core 31, but it is preferable to use long synthetic fibers. As the synthetic fiber, polyester multifilament is particularly preferable in terms of mechanical properties and manufacturing costs.

[0018] The number of new strands 32 is eight. The multiple new strands 32 are disposed on the outer periphery of the new rope core 31. In addition, the multiple new strands 32 are twisted together on the outer periphery of the new rope core 31.

[0019] Each new strand 32 has a first central wire 33, a first outer layer 34, and a first inner layer 35. The first outer layer 34 is disposed on the outer periphery of the first central wire 33 via the first inner layer 35. The first outer layer 34 is located on the outermost periphery of each new strand 32, and is in contact with the outer periphery of the new rope core 31. The first inner layer 35 is disposed between the first central wire 33 and the first outer layer 34.

[0020] The first outer layer 34 is composed of a plurality of first outer layer wires 36. The plurality of first outer layer wires 36 are twisted around the outer periphery of the first inner layer 35. The number of the first outer layer wires 36 in each new strand 32 is preferably 10 or more and 15 or less. In this example, the number of the first outer layer wires 36 in each new strand 32 is 10.

[0021] The first inner layer 35 is composed of a plurality of first inner layer wires 37. The plurality of first inner layer wires 37 are twisted around the outer periphery of the first central wire 33. The number of first inner layer wires 37 in each new strand 32 is ten. The diameter of each of the first inner layer wires 37 is smaller than the diameter of each of the first outer layer wires 36. Thus, the cross-sectional configuration of each new strand 32 is a sealed type.

[0022] The elevator equipment renovation method of the first embodiment includes a rope replacement process. The rope replacement process is a process of replacing a plurality of old wire ropes wound around the drive sheave 5 with a plurality of new wire ropes 7. The plurality of old wire ropes are wire ropes that were wound around the drive sheave 5 before being replaced with the plurality of new wire ropes 7.

[0023] The hoist 3 is designed to raise and lower the car 8 and the counterweight 9 via a plurality of old wire ropes. In the first embodiment, the hoist 3 used before the rope replacement process is also used after the rope replacement process.

[0024] The drive sheave 5 is provided with a plurality of rope grooves into which the old wire ropes were inserted. Each new wire rope 7 is inserted into a corresponding one of the plurality of rope grooves.

[0025] Fig. 3 is a cross-sectional view of the old wire rope of the first embodiment, showing a cross section perpendicular to the longitudinal direction of the old wire rope. The old wire rope 20 is an 8xS(19) type rope conforming to JIS G 3525. Note that the notation in the EN region is 8x19S.

[0026] The old wire rope 20 has an old rope core 21 and a plurality of old steel strands 22. The old rope core 21 is made of natural fiber.

[0027] The number of old strands 22 is eight. That is, the number of new strands 32 is the same as the number of old strands 22. The multiple old strands 22 are disposed on the outer periphery of the old rope core 21. In addition, the multiple old strands 22 are twisted together on the outer periphery of the old rope core 21.

[0028] Each old strand 22 has a second central wire 23, a second outer layer 24, and a second inner layer 25. The second outer layer 24 is disposed on the outer periphery of the second central wire 23 via the second inner layer 25. The second outer layer 24 is located on the outermost periphery of each old strand 22, and is in contact with the outer periphery of the old rope core 21. The second inner layer 25 is disposed between the second central wire 23 and the second outer layer 24.

[0029] The second outer layer 24 is composed of a plurality of second outer layer wires 26. The plurality of second outer layer wires 26 are twisted together on the outer periphery of the second inner layer 25. The number of second outer layer wires 26 in each old strand 22 is nine.

[0030] The second inner layer 25 is composed of a plurality of second inner layer wires 27. The plurality of second inner layer wires 27 are twisted around the outer periphery of the second central wire 23. The number of second inner layer wires 27 in each old strand 22 is nine.

[0031] The tensile strength of each new wire rope 7 is higher than the tensile strength of each old wire rope 20. The difference between the unit mass of each new wire rope 7 and the unit mass of each old wire rope 20, and the difference between the diameter of each new wire rope 7 and the diameter of each old wire rope 20 are within a range that does not require replacement of the hoist 3 accompanying rope replacement.

[0032] That is, the difference between the occupancy rate of steel wires in each new wire rope 7 and the occupancy rate of steel wires in each old wire rope 20 is within the tolerance range, and the difference between the unit mass of each new wire rope 7 and the unit mass of each old wire rope 20 is within the tolerance range. Also, the difference between the diameter of each new wire rope 7 and the diameter of each old wire rope 20 is within the tolerance range.

[0033] The difference between the unit mass of the new rope core 31 and the unit mass of the old rope core 21, and the difference between the tensile strength of each of the first outer layer wires 36 and the tensile strength of each of the second outer layer wires 26 are within the respective tolerance ranges. The tensile strength of each of the first outer layer wires 36 is 1770 N / m m 2 For example, 1620N / mm 2 Grade or 1770N / mm 2 It is of class.

[0034] The tensile strength of the first central strand 33 is higher than the tensile strength of the second central strand 23. The tensile strength of each of the first inner layer strands 37 is higher than the tensile strength of each of the second inner layer strands 27.

[0035] The number of first outer layer wires 36 in each new strand 32 is greater than the number of second outer layer wires 26 in each old strand 22. The number of first inner layer wires 37 in each new strand 32 is greater than the number of second inner layer wires 27 in each old strand 22.

[0036] The tensile strength of the first central strand 33 and the tensile strength of each of the first inner layer strands 37 are about 1.5 times that of the second central strand 23 and each of the second inner layer strands 27. That is, the tensile strength of the first central strand 33 and the tensile strength of each of the first inner layer strands 37 are each 2000 N / m 2 More than, for example, 2300N / mm 2 Grade or 2400N / mm 2 It is of class.

[0037] The diameter of each of the first outer layer wires 36 is smaller than the diameter of each of the second outer layer wires 26. In addition, the cross-sectional occupancy rate of the multiple first outer layer wires 36 in each new strand 32 is lower than the cross-sectional occupancy rate of the multiple second outer layer wires 26 in each old strand 22.

[0038] Normally, when the difference between the unit mass of the wire rope before and after replacement exceeds a certain level, the mass balance between the cage side and the counterweight side changes before and after replacement. This makes it impossible to use the hoist motor and hoist brake of the existing hoist. Also, traction loss may occur.

[0039] For this reason, wire ropes with a different unit mass from conventionally used wire ropes are used for newly installed elevator systems, but the demand for wire ropes is largely for rope replacement during maintenance of existing elevator systems.

[0040] Another method for increasing rope strength without changing the unit mass is to use high-strength fibers for the rope core material, but high-strength fibers are usually expensive, which makes the entire wire rope expensive.

[0041] Another way to simply increase the strength of a wire rope is to increase the strength class of the wire rope by one level. However, if the tensile strength of each wire in the strand is increased to achieve a higher strength wire rope, the hardness of each wire also increases. This increases the contact pressure of the wire rope against the driving sheave, causing the problem of premature wear of the driving sheave.

[0042] In contrast, in the elevator apparatus and its renovation method of the first embodiment, the tensile strength of each new wire rope 7 is higher than the tensile strength of each old wire rope 20. Furthermore, the difference between the unit mass of each new wire rope 7 and the unit mass of each old wire rope 20 is within a range in which replacement of the hoist 3 accompanying rope replacement is unnecessary. Furthermore, the difference between the diameter of each new wire rope 7 and the diameter of each old wire rope 20 is within a range in which replacement of the hoist 3 accompanying rope replacement is unnecessary.

[0043] Therefore, it is possible to ensure compatibility between the old wire rope 20 and the new wire rope 7 and easily improve the performance of the wire rope that suspends the car 8 without replacing peripheral devices including the hoisting machine 3. This makes it possible to extend the maintenance and inspection cycle and replacement cycle of the new wire rope 7, thereby reducing the life cycle cost.

[0044] In addition, the new wire rope 7 can be used in both existing and new elevator equipment. This allows the production volume of the new wire rope 7 to be increased, improving production efficiency and reducing the number of rope types.

[0045] In addition, since the new wire rope 7 has a higher strength than the old wire rope 20, the number of new wire ropes 7 in a newly installed elevator may be less than the number of old wire ropes 20. In this case, the number of rope grooves in the drive sheave of the newly installed hoisting machine can be reduced, making the hoisting machine thinner. Also, the deflector sheave can be made thinner.

[0046] In addition, the hoist 3 used before the rope replacement process can be used after the rope replacement process, making the repair work easier.

[0047] The tensile strength of the first central wire 33 is higher than the tensile strength of the second central wire 23. The number of first outer layer wires 36 in each new strand 32 is greater than the number of second outer layer wires 26 in each old strand 22. Each new wire rope 7 and the unit mass of 20 of each old wire rope The difference between the unit mass of each of the first outer layer strands 36 and the unit mass of each of the second outer layer strands 26 is within the tolerance range. Also, the difference between the tensile strength of each of the first outer layer strands 36 and the tensile strength of each of the second outer layer strands 26 is within the tolerance range.

[0048] For this reason, the hardness of each of the first outer layer wires 36 in contact with the drive sheave 5 in the new wire rope 7 remains the same as the hardness of each of the second outer layer wires 26. Therefore, while ensuring compatibility with the old wire rope 20, the rope strength is improved and premature damage to the new wire rope 7 and premature wear of the drive sheave 5 can be suppressed.

[0049] Additionally, the tensile strength of each of the first inner layer wires 37 is higher than the tensile strength of each of the second inner layer wires 27. Additionally, the number of first inner layer wires 37 in each new strand 32 is greater than the number of second inner layer wires 27 in each old strand 22. This makes it possible to more reliably ensure compatibility with the old wire rope 20 while improving the rope strength.

[0050] The tensile strength of each of the first central wires 33 and each of the first inner layer wires 37 is 2000 N / m 2 This is the above. Therefore, the breaking load of the new wire rope 7 can be more reliably increased. Note that the upper limit of the tensile strength that can be achieved without increasing costs in steel wires used in elevator equipment is approximately 2500 N / mm 2 It is of class.

[0051] The tensile strength of each of the first outer layer wires 36 is 1770 N / m 2 As a result, damage to the new wire rope 7 and wear on the drive sheave 5 can be more reliably suppressed.

[0052] The number of new strands 32 is the same as the number of old strands 22. The number of first outer layer wires 36 in each new strand 32 is 10, which is more than the number of second outer layer wires 26 in each old strand 22. Therefore, while more reliably ensuring compatibility with the old wire rope 20, the contact surface pressure of the new wire rope 7 against the drive sheave 5 can be reduced, and damage to the new wire rope 7 and wear of the drive sheave 5 can be more reliably suppressed.

[0053] Moreover, the material of the new rope core 31 is long synthetic fiber, which can extend the life of the new wire rope 7 as a whole.

[0054] In addition, the cross-sectional configuration of each new strand 32 is a simple sealed shape. Therefore, the new wire rope 7 can be easily manufactured by the same manufacturing equipment as that for the old wire rope 20, and the manufacturing cost can be kept at the same level as that for the old wire rope 20.

[0055] The diameter of wire ropes used in elevator systems is typically within the range of 8 mm to 12 mm. In such wire ropes, the more wires that make up a strand, the thinner the wires become. If the number of wires exceeds 30, the equipment for manufacturing the strands becomes limited, and manufacturing costs increase. For this reason, it is preferable that the number of first outer layer wires 36 be 15 or less.

[0056] Furthermore, by making the number of new strands 32 six or more, the cross-sectional shape of the new wire rope 7 can be stabilized.

[0057] Fig. 4 is a cross-sectional view showing a first modified example of the new wire rope 7 according to embodiment 1. In the first modified example, the number of first outer layer wires 36 in each new strand 32 is 11. Also, the number of first inner layer wires 37 in each new strand 32 is also 11. That is, the new wire rope 7 of the first modified example is an 8xS(23) type rope.

[0058] Fig. 5 is a cross-sectional view showing a second modified example of the new wire rope 7 according to embodiment 1. In the second modified example, the number of first outer layer wires 36 in each new strand 32 is 12. Also, the number of first inner layer wires 37 in each new strand 32 is also 12. That is, the new wire rope 7 of the second modified example is an 8xS(25) type rope.

[0059] Fig. 6 is a cross-sectional view showing a third modified example of the new wire rope 7 according to embodiment 1. In the third modified example, the number of first outer layer wires 36 in each new strand 32 is 13. Also, the number of first inner layer wires 37 in each new strand 32 is also 13. In other words, the new wire rope 7 of the 36th modified example is an 8xS(27) type rope.

[0060] Fig. 7 is a cross-sectional view showing a fourth modified example of the new wire rope 7 according to embodiment 1. In the fourth modified example, the number of first outer layer wires 36 in each new strand 32 is 14. Also, the number of first inner layer wires 37 in each new strand 32 is also 14. That is, the new wire rope 7 of the fourth modified example is an 8xS(29) type rope.

[0061] Fig. 8 is a cross-sectional view showing a fifth modified example of the new wire rope 7 according to embodiment 1. In the fifth modified example, the number of first outer layer wires 36 in each new strand 32 is 15. Also, the number of first inner layer wires 37 in each new strand 32 is also 15. That is, the new wire rope 7 of the fifth modified example is an 8xS(31) type rope.

[0062] The configurations shown in Figures 4 to 8 can also provide the same effects as the new wire rope 7 in Figure 2. In addition, the contact area between the new wire rope 7 and the driving sheave 5 increases, and the contact pressure decreases. This allows the new wire rope 7 to have a longer life.

[0063] 9 is a cross-sectional view showing a sixth modified example of the new wire rope 7 according to the first embodiment. In the sixth modified example, each new strand 32 is composed only of a first central wire 33 and a first outer layer 34. The first outer layer 34 is in direct contact with the outer periphery of the first central wire 33 without the first inner layer 35 being interposed therebetween. In other words, the new strand 32 of the sixth modified example is of a single lay type. The number of first outer layer wires 36 in each new strand 32 is 13.

[0064] The configuration shown in FIG. 9 can also provide the same effects as the new wire rope 7 shown in FIG.

[0065] In addition, the diameter of the first central wire 33 in the single lay type is larger than the diameter of the first central wire 33 in the sealed type. For this reason, the new wire rope 7 of the sixth modified example is suitable for application to elevator devices with a small rope diameter.

[0066] In addition, the number of strands in each of the new wire rope 7 and the old wire rope 20 is not limited to eight.

[0067] In addition, the configuration of the new wire rope 7 can also be applied to wire ropes other than the wire rope that suspends the car 8, such as balancing ropes or governor ropes.

[0068] Furthermore, the layout of the entire elevator apparatus is not limited to the layout in Fig. 1. For example, the roping system may be a 2:1 roping system.

[0069] The elevator system may be a machine room-less elevator, a double deck elevator, a one-shaft multi-car elevator system, etc. The one-shaft multi-car system is a system in which an upper car and a lower car arranged directly below the upper car each independently ascend and descend in a common elevator shaft. [Explanation of symbols]

[0070] 3 hoist, 5 drive sheave, 7 new wire rope, 8 cage, 20 old wire rope, 21 old rope core, 22 old strand, 23 second central wire, 24 second outer layer, 25 second inner layer, 26 second outer layer wire, 27 second inner layer wire, 31 new rope core, 32 new strand, 33 first central wire, 34 first outer layer, 35 first inner layer, 36 first outer layer wire, 37 first inner layer wire.

Claims

1. Several new wire ropes, a car suspended within a hoistway by the plurality of new wire ropes; and a hoisting machine having a drive sheave around which the plurality of new wire ropes are wound, and which raises and lowers the car via the plurality of new wire ropes; Equipped with the hoist is designed to raise and lower the car via a plurality of old wire ropes that are wire ropes that were wound around the drive sheave before being replaced with the plurality of new wire ropes, The tensile strength of each of the new wire ropes is higher than the tensile strength of each of the old wire ropes, the difference between the unit mass of each of the new wire ropes and the unit mass of each of the old wire ropes, and the difference between the diameter of each of the new wire ropes and the diameter of each of the old wire ropes, are within a range that does not require replacement of the hoist in conjunction with rope replacement, Each of the new wire ropes has a new rope core and a plurality of new steel strands arranged on an outer periphery of the new rope core, Each of the new strands is A first central strand; a first outer layer including a plurality of first outer layer wires and disposed around the first central wire; a first inner layer including a plurality of first inner layer wires and disposed between the first central wire and the first outer layer; It has Each of the old wire ropes has an old rope core and a plurality of old steel strands arranged on an outer periphery of the old rope core, Each of the old strands is A second central strand; and a second outer layer including a plurality of second outer layer wires and disposed around the second central wire; a second inner layer including a plurality of second inner layer wires and disposed between the second central wire and the second outer layer; It has The tensile strength of the first central strand is higher than the tensile strength of the second central strand, the number of the first outer layer wires in each of the new strands is greater than the number of the second outer layer wires in each of the old strands; a difference between the unit mass of the new rope core and the unit mass of the old rope core, and a difference between the tensile strength of each of the first outer layer strands and the tensile strength of each of the second outer layer strands are within a tolerance range, the tensile strength of each of the first inner layer strands is higher than the tensile strength of each of the second inner layer strands, an elevator apparatus, wherein the number of the first inner layer wires in each of the new strands is greater than the number of the second inner layer wires in each of the old strands.

2. The tensile strength of the first central strand and the tensile strength of each of the first inner layer strands are 2000 N / mm ２ 2. The elevator apparatus according to claim 1 .

3. The tensile strength of each of the first outer layer wires is 1770 N / mm ２ 3. The elevator apparatus according to claim 1 or 2, wherein:

4. The number of the new strands is the same as the number of the old strands, 3. The elevator apparatus according to claim 1, wherein the number of the first outer layer wires in each new strand is 10 or more and 15 or less.

5. 3. The elevator apparatus according to claim 1 or 2, wherein the material of the new rope core is long synthetic fiber.

6. Several new wire ropes, a car suspended within a hoistway by the plurality of new wire ropes; and a hoisting machine having a drive sheave around which the plurality of new wire ropes are wound, and which raises and lowers the car via the plurality of new wire ropes; Equipped with the hoist is designed to raise and lower the car via a plurality of old wire ropes that are wire ropes that were wound around the drive sheave before being replaced with the plurality of new wire ropes, The tensile strength of each of the new wire ropes is higher than the tensile strength of each of the old wire ropes, the difference between the unit mass of each of the new wire ropes and the unit mass of each of the old wire ropes, and the difference between the diameter of each of the new wire ropes and the diameter of each of the old wire ropes, are within a range that does not require replacement of the hoist in conjunction with rope replacement, Each of the new wire ropes has a new rope core and a plurality of new steel strands arranged on an outer periphery of the new rope core, Each of the new strands is A first central strand; a first outer layer including a plurality of first outer layer wires and disposed around the first central wire; a first inner layer including a plurality of first inner layer wires and disposed between the first central wire and the first outer layer; It has Each of the old wire ropes has an old rope core and a plurality of old steel strands arranged on an outer periphery of the old rope core, Each of the old strands is A second central strand; and a second outer layer including a plurality of second outer layer wires and disposed around the second central wire; a second inner layer including a plurality of second inner layer wires and disposed between the second central wire and the second outer layer; It has An elevator apparatus, wherein the tensile strength of each of the first inner layer wires is higher than the tensile strength of each of the second inner layer wires.

7. A rope replacement process is included in which a plurality of old wire ropes wound around a drive sheave of a hoist are replaced with a plurality of new wire ropes, The tensile strength of each of the new wire ropes is higher than the tensile strength of each of the old wire ropes, the difference between the unit mass of each of the new wire ropes and the unit mass of each of the old wire ropes, and the difference between the diameter of each of the new wire ropes and the diameter of each of the old wire ropes, are within a range that does not require replacement of the hoist in conjunction with rope replacement, Each of the new wire ropes has a new rope core and a plurality of new steel strands arranged on an outer periphery of the new rope core, Each of the new strands is A first central strand; a first outer layer including a plurality of first outer layer wires and disposed around the first central wire; a first inner layer including a plurality of first inner layer wires and disposed between the first central wire and the first outer layer; It has Each of the old wire ropes has an old rope core and a plurality of old steel strands arranged on an outer periphery of the old rope core, Each of the old strands is A second central strand; and a second outer layer including a plurality of second outer layer wires and disposed around the second central wire; a second inner layer including a plurality of second inner layer wires and disposed between the second central wire and the second outer layer; It has The tensile strength of the first central strand is higher than the tensile strength of the second central strand, the number of the first outer layer wires in each of the new strands is greater than the number of the second outer layer wires in each of the old strands; a difference between the unit mass of the new rope core and the unit mass of the old rope core, and a difference between the tensile strength of each of the first outer layer strands and the tensile strength of each of the second outer layer strands are within a tolerance range, the tensile strength of each of the first inner layer strands is higher than the tensile strength of each of the second inner layer strands, the number of the first inner layer wires in each of the new strands is greater than the number of the second inner layer wires in each of the old strands; A method for renovating an elevator apparatus, comprising the steps of: (a) providing a hoisting machine, which has been in use before the rope replacement process, and (b) continuing to use the hoisting machine after the rope replacement process;

8. The method for repairing an elevator apparatus according to claim 7, wherein the number of the new wire ropes is smaller than the number of the old wire ropes.

9. A rope replacement process is included in which a plurality of old wire ropes wound around a drive sheave of a hoist are replaced with a plurality of new wire ropes, The tensile strength of each of the new wire ropes is higher than the tensile strength of each of the old wire ropes, the difference between the unit mass of each of the new wire ropes and the unit mass of each of the old wire ropes, and the difference between the diameter of each of the new wire ropes and the diameter of each of the old wire ropes, are within a range that does not require replacement of the hoist in conjunction with rope replacement, Each of the new wire ropes has a new rope core and a plurality of new steel strands arranged on an outer periphery of the new rope core, Each of the new strands is A first central strand; a first outer layer including a plurality of first outer layer wires and disposed around the first central wire; a first inner layer including a plurality of first inner layer wires and disposed between the first central wire and the first outer layer; It has Each of the old wire ropes has an old rope core and a plurality of old steel strands arranged on an outer periphery of the old rope core, Each of the old strands is A second central strand; and a second outer layer including a plurality of second outer layer wires and disposed around the second central wire; a second inner layer including a plurality of second inner layer wires and disposed between the second central wire and the second outer layer; It has A method for renovating an elevator system, wherein a tensile strength of each of the first inner layer wires is higher than a tensile strength of each of the second inner layer wires.

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