JP7595481B2 - Scaffolding device for replacing counterweight and method for replacing counterweight - Google Patents

Description

This disclosure relates to a scaffolding device for replacing counterweights and a method for replacing counterweights.

Conventionally, a method of replacing a counterweight is known in which an existing counterweight is removed from a hoistway and a new counterweight is brought into the hoistway, replacing the existing counterweight with the new counterweight (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 11-349255

When an existing counterweight is to be transported from the hoistway to the landing, first a fixed scaffold is installed in the hoistway adjacent to the landing. Then, a worker stands on the installed fixed scaffold and transports the multiple adjustment weight pieces placed on the counterweight frame out of the hoistway, and then the counterweight frame is removed from the hoistway. When a new counterweight is to be transported from the landing to the hoistway, a worker stands on the fixed scaffold and transports the counterweight frame into the hoistway, and then the multiple adjustment weight pieces are transported into the hoistway and placed on the counterweight frame.

If the height dimension of the counterweight is large, a worker standing on the fixed scaffold cannot reach the uppermost adjustment weight piece among the multiple adjustment weight pieces placed on the existing counterweight frame. This means that the worker standing on the fixed scaffold cannot remove the adjustment weight piece from the existing counterweight frame. Similarly, the worker standing on the fixed scaffold cannot attach the adjustment weight piece to the new counterweight frame. Therefore, the worker sets up a scaffold support leg on the fixed scaffold and places an additional scaffold board on the scaffold support leg. After that, the worker standing on the additional scaffold board removes the adjustment weight piece from the existing counterweight frame and attaches the adjustment weight piece to the new counterweight frame.

However, after removing the adjusting weight piece from the existing counterweight frame, workers must remove the scaffolding support legs and additional scaffolding boards from the fixed scaffold in order to transport the existing counterweight frame from the hoistway to the landing. Also, after removing the scaffolding support legs and additional scaffolding boards from the fixed scaffold, workers must once again erect the scaffolding support legs on the fixed scaffold and place the additional scaffolding boards on the scaffolding support legs in order to attach the adjusting weight piece to the new counterweight frame. This posed a problem in that the efficiency of the counterweight replacement work was low.

This disclosure has been made to solve the problems described above, and its purpose is to provide a scaffolding device for replacing counterweights and a method for replacing counterweights that can improve the efficiency of counterweight replacement work.

The scaffolding device for replacing a counterweight disclosed herein comprises a fixed scaffolding installed in a hoistway, and an adjustable scaffolding arranged above the fixed scaffolding and attached to a pair of counterweight guide rails, wherein the fixed scaffolding is arranged in the hoistway adjacent to the landing, and the adjustable scaffolding has a first rotating shaft attached to one of the pair of counterweight guide rails, a support part attached to the other of the pair of counterweight guide rails, and a scaffolding board rotatably mounted on the first rotating shaft, and the scaffolding board moves between an installation position that is arranged across the first rotating shaft and the support part and faces the fixed scaffolding in the height direction, and a storage position that is a position shifted from the installation position, by rotating around the first rotating shaft.
The counterweight replacement method according to the present disclosure includes a scaffolding device installation process for installing a fixed scaffolding in a hoistway, attaching an adjustable scaffolding to a pair of counterweight guide rails, and setting the position of the scaffolding board to an installation position; a counterweight moving process for moving the existing counterweight to a position corresponding to the landing; an adjustment weight piece carrying out process for removing a plurality of adjustment weight pieces placed on the counterweight frame of the existing counterweight from the counterweight frame after the scaffolding device installation process and the counterweight moving process; a scaffolding board storage process for moving the position of the scaffolding board from the installation position to a storage position after the adjustment weight piece carrying out process; The method includes a counterweight frame replacement process in which, after the counterweight frame replacement process, the counterweight frame of the existing counterweight is removed from the hoistway and a counterweight frame of the new counterweight is brought into the hoistway; a scaffold board installation process in which, after the counterweight frame replacement process, the position of the scaffold board is moved from a stored position to an installation position; an adjustment weight piece delivery process in which, after the scaffold board installation process, a plurality of adjustment weight pieces are attached to the counterweight frame of the new counterweight; and a scaffold device removal process in which, after the adjustment weight piece delivery process, the adjustable scaffold is detached from the pair of counterweight guide rails and the fixed scaffold is removed from the hoistway.

The counterweight replacement scaffolding device and counterweight replacement method disclosed herein can improve the efficiency of counterweight replacement work.

1 is a plan view showing an elevator apparatus to which a counterweight replacement scaffolding apparatus according to a first embodiment is attached. FIG. FIG. 2 is a side view showing a state in which the counterweight replacement scaffolding device according to the first embodiment is attached to the elevator device of FIG. 1 . FIG. 3 is a front view showing the counterweight replacement scaffolding device and elevator device of FIG. 2. FIG. 4 is a diagram showing the scaffold board of FIG. 3 and the state in which the scaffold board is in a bent shape. FIG. 4 shows the scaffold board of FIG. 3 in a stowed position. 4 is a flowchart showing a counterweight replacing method according to the first embodiment.

Embodiment 1.
1 is a plan view showing an elevator apparatus to which a counterweight replacement scaffolding device according to embodiment 1 is attached. The elevator apparatus includes a car 1, a pair of car guide rails 2, a counterweight 3, and a pair of counterweight guide rails 4. Each of the car 1, the car guide rails 2, the counterweight 3, and the counterweight guide rails 4 is provided in a hoistway 5.

Each car guide rail 2 is arranged to extend in the vertical direction. In addition, each car guide rail 2 is arranged to face each other in the frontage direction A of the entrance to the landing 6. The car 1 is arranged between the pair of car guide rails 2. The car 1 is guided by the pair of car guide rails 2 to move up and down the elevator shaft 5.

Each counterweight guide rail 4 is arranged to extend in the vertical direction. In addition, each counterweight guide rail 4 is arranged to face each other in the frontage direction A of the entrance to the landing 6. The counterweight 3 is arranged between the pair of counterweight guide rails 4. The counterweight 3 is guided by the pair of counterweight guide rails 4 and moves up and down the elevator shaft 5.

The counterweight 3 and the pair of counterweight guide rails 4 are each positioned farther from the landing 6 than the car 1 and the pair of car guide rails 2. In other words, the car 1 and the pair of car guide rails 2 are positioned between the counterweight 3 and the pair of counterweight guide rails 4 and the landing 6.

The counterweight 3 has a counterweight frame 301 and a number of adjustment weight pieces 302 placed on the counterweight frame 301. The weight of the counterweight 3 is adjusted by adjusting the number of adjustment weight pieces 302 placed on the counterweight frame 301.

When elevator equipment renovation work is carried out, both the car 1 and the counterweight 3 are replaced.

Figure 2 is a side view showing the scaffolding device for replacing a counterweight according to the first embodiment attached to the elevator device of Figure 1. Figure 3 is a front view showing the scaffolding device for replacing a counterweight and the elevator device of Figure 2. The scaffolding device 7 for replacing a counterweight according to the first embodiment is installed in the elevator shaft 5 when the counterweight 3 is replaced.

The counterweight replacement scaffolding device 7 according to the first embodiment includes a fixed scaffolding 701, multiple adjustable scaffoldings 702, and a worker safety device 703.

The fixed scaffold 701 has a pair of fixed parts 704, one attached to each of the pair of counterweight guide rails 4, and a fixed scaffold board 705 fixed to each of the pair of fixed parts 704. The fixed scaffold board 705 is disposed across the pair of fixed parts 704 and the floor surface of the landing 6. The fixed scaffold 701 is disposed in the hoistway 5 so as to be adjacent to the landing 6 from which the counterweight frame 301 of the existing counterweight 3 is carried out from the hoistway 5.

In the first embodiment, the number of adjustable scaffolds 702 is two. The two adjustable scaffolds 702 are arranged next to each other in the vertical direction. Of the two adjustable scaffolds 702, the lower adjustable scaffold 702 is designated as a first adjustable scaffold 706, and the upper adjustable scaffold 702 is designated as a second adjustable scaffold 707.

The number of adjustable scaffolds 702 is not limited to two, but may be three or more, or may be one.

Each of the multiple adjustable scaffolds 702 is positioned above the fixed scaffold 701. Therefore, the fixed scaffold 701, the first adjustable scaffold 706, and the second adjustable scaffold 707 are positioned from the bottom in the following order: fixed scaffold 701, first adjustable scaffold 706, second adjustable scaffold 707.

The first adjustable scaffold 706 has a pair of fixed parts 708, a first rotation axis 709, a support part 710, and a number of scaffolding boards 711.

One of the pair of counterweight guide rails 4 is the first counterweight guide rail 401, and the other of the pair of counterweight guide rails 4 is the second counterweight guide rail 402.

One of the pair of fixing parts 708 is the first fixing part 712, and the other of the pair of fixing parts 708 is the second fixing part 713. The first fixing part 712 is attached to the first counterweight guide rail 401, and the second fixing part 713 is attached to the second counterweight guide rail 402.

The first fixing portion 712 is fixed to the first counterweight guide rail 401 using a rail clip (not shown). Therefore, when the rail clip is removed from the first counterweight guide rail 401, the first fixing portion 712 is removed from the first counterweight guide rail 401.

The second fixing portion 713 is fixed to the second counterweight guide rail 402 using a rail clip (not shown). Therefore, by removing the rail clip from the second counterweight guide rail 402, the second fixing portion 713 is removed from the second counterweight guide rail 402.

The first rotating shaft 709 is fixed to the first fixed part 712. Therefore, the first rotating shaft 709 is attached to the first counterweight guide rail 401 via the first fixed part 712. The first rotating shaft 709 is formed in a cylindrical shape. When the first fixed part 712 is attached to the first counterweight guide rail 401, the first rotating shaft 709 is arranged to extend in the depth direction B of the landing 6.

The support part 710 is fixed to the second fixing part 713. Therefore, the support part 710 is attached to the second counterweight guide rail 402 via the second fixing part 713. The support part 710 is formed in a cylindrical shape. When the second fixing part 713 is attached to the second counterweight guide rail 402, the support part 710 is arranged to extend in the depth direction B of the landing 6.

The first fixed part 712 is attached to the first counterweight guide rail 401, and the second fixed part 713 is attached to the second counterweight guide rail 402. In this case, the first rotating shaft 709 and the support part 710 are arranged to face each other in the frontage direction A of the entrance/exit of the landing 6.

Each scaffolding board 711 is rotatably mounted on the first rotation axis 709. In the first embodiment, the number of scaffolding boards 711 is three. The three scaffolding boards 711 are arranged side by side in the depth direction B of the landing 6.

Each scaffolding board 711 has a first scaffolding piece 714, a second rotation axis 715, and a second scaffolding piece 716.

The first scaffold piece 714 is rotatably mounted on the first rotation shaft 709. The second rotation shaft 715 is mounted on the first scaffold piece 714. The first scaffold piece 714 is formed in a long board shape. The first rotation shaft 709 is provided at one end of the first scaffold piece 714 in the longitudinal direction, and the second rotation shaft 715 is provided at the other end of the first scaffold piece 714 in the longitudinal direction. The first rotation shaft 709 and the second rotation shaft 715 are disposed opposite each other. Furthermore, the first rotation shaft 709 and the second rotation shaft 715 are disposed parallel to each other.

The second scaffolding piece 716 is rotatably mounted on the second rotating shaft 715. The second scaffolding piece 716 is formed in a long board shape. The second rotating shaft 715 is provided at one end of the second scaffolding piece 716 in the longitudinal direction. The other end of the second scaffolding piece 716 in the longitudinal direction is placed on the support part 710. The other end of the second scaffolding piece 716 in the longitudinal direction is shaped like a hook that can be hung from above on the support part 710.

The shape of the scaffolding board 711 changes between a flat shape and a curved shape as the second scaffolding piece 716 rotates around the second rotation axis 715. When the scaffolding board 711 is flat, the first scaffolding piece 714 and the second scaffolding piece 716 are arranged along the same plane. On the other hand, when the scaffolding board 711 is curved, the first scaffolding piece 714 and the second scaffolding piece 716 are arranged along different planes.

When the scaffold board 711 has a flat shape, the radial dimension of the first rotating shaft 709 on the scaffold board 711 is greater than the dimension between the first rotating shaft 709 and the support part 710. On the other hand, when the scaffold board 711 has a curved shape, the radial dimension of the first rotating shaft 709 on the scaffold board 711 is smaller than the dimension between the first rotating shaft 709 and the support part 710.

The second adjustable scaffolding 707 has a pair of fixed parts 717, a first rotating shaft 718, a support part 719, and a number of scaffolding boards 720.

One of the pair of fixing parts 717 is the first fixing part 721, and the other of the pair of fixing parts 717 is the second fixing part 722. The first fixing part 721 is attached to the first counterweight guide rail 401, and the second fixing part 722 is attached to the second counterweight guide rail 402.

The first fixing portion 721 is fixed to the first counterweight guide rail 401 using a rail clip (not shown). Therefore, when the rail clip is removed from the first counterweight guide rail 401, the first fixing portion 721 is removed from the first counterweight guide rail 401.

The second fixing portion 722 is fixed to the second counterweight guide rail 402 using a rail clip (not shown). Therefore, by removing the rail clip from the second counterweight guide rail 402, the second fixing portion 722 is removed from the second counterweight guide rail 402.

The first rotating shaft 718 is fixed to the first fixed portion 721. Therefore, the first rotating shaft 718 is attached to the first counterweight guide rail 401 via the first fixed portion 721. The first rotating shaft 718 is formed in a cylindrical shape. When the first fixed portion 721 is attached to the first counterweight guide rail 401, the first rotating shaft 718 is arranged to extend in the depth direction B of the landing 6.

The support part 719 is fixed to the second fixing part 722. Therefore, the support part 719 is attached to the second counterweight guide rail 402 via the second fixing part 722. The support part 719 is formed in a cylindrical shape. When the second fixing part 722 is attached to the second counterweight guide rail 402, the support part 719 is arranged to extend in the depth direction B of the landing 6.

The first fixed part 721 is attached to the first counterweight guide rail 401, and the second fixed part 722 is attached to the second counterweight guide rail 402. In this case, the first rotating shaft 718 and the support part 719 are arranged to face each other in the frontage direction A of the entrance/exit of the landing 6.

Each scaffolding board 720 is rotatably mounted on a first rotation shaft 718. In the first embodiment, the number of scaffolding boards 720 is two. The two scaffolding boards 720 are arranged side by side in the depth direction B of the landing 6.

Each scaffolding board 720 has a first scaffolding piece 723, a second rotation axis 724, and a second scaffolding piece 725.

The first scaffold piece 723 is rotatably mounted on the first rotating shaft 718. The second rotating shaft 724 is mounted on the first scaffold piece 723. The first scaffold piece 723 is formed in a long board shape. The first rotating shaft 718 is provided at one end in the longitudinal direction of the first scaffold piece 723, and the second rotating shaft 724 is provided at the other end in the longitudinal direction of the first scaffold piece 723. The first rotating shaft 718 and the second rotating shaft 724 are disposed opposite each other. Furthermore, the first rotating shaft 718 and the second rotating shaft 724 are disposed parallel to each other.

The second scaffold piece 725 is rotatably mounted on the second rotating shaft 724. The second scaffold piece 725 is formed in a long board shape. The second rotating shaft 724 is provided at one end in the longitudinal direction of the second scaffold piece 725. The other end in the longitudinal direction of the second scaffold piece 725 is placed on the support part 719. The other end in the longitudinal direction of the second scaffold piece 725 is shaped like a hook that can be hung from above on the support part 719.

The shape of the scaffolding board 720 changes between a flat shape and a curved shape as the second scaffolding piece 725 rotates around the second rotation axis 724. When the scaffolding board 720 is flat, the first scaffolding piece 723 and the second scaffolding piece 725 are arranged along the same plane. On the other hand, when the scaffolding board 720 is curved, the first scaffolding piece 723 and the second scaffolding piece 725 are arranged along different planes.

When the scaffold board 720 has a flat shape, the radial dimension of the first rotating shaft 718 in the scaffold board 720 is greater than the dimension between the first rotating shaft 718 and the support part 719. On the other hand, when the scaffold board 720 has a curved shape, the radial dimension of the first rotating shaft 718 in the scaffold board 720 is smaller than the dimension between the first rotating shaft 718 and the support part 719.

The first adjustable scaffold 706 and the second adjustable scaffold 707 have the same structure, except that the number of scaffold boards 711 and the number of scaffold boards 720 are different.

The worker safety device 703 has a fixed part 726, a support rod 727, and a rope 728.

The fixed portion 726 is fixed to the first counterweight guide rail 401 using a rail clip (not shown). Therefore, when the rail clip is removed from the first counterweight guide rail 401, the fixed portion 726 is removed from the first counterweight guide rail 401. The fixed portion 726 may be attached to the second counterweight guide rail 402 instead of the first counterweight guide rail 401.

The support rod 727 is fixed to the fixed portion 726. Therefore, the support rod 727 is attached to the first counterweight guide rail 401 via the fixed portion 726. The support rod 727 is formed in a cylindrical shape. When the fixed portion 726 is attached to the first counterweight guide rail 401, the support rod 727 is positioned so as to extend in the depth direction B of the landing 6.

The rope 728 is suspended from a support rod 727. The portion of the rope 728 attached to the support rod 727 is movable in the longitudinal direction of the support rod 727. In other words, the portion of the rope 728 attached to the support rod 727 is movable in the depth direction B of the landing 6. The lower end of the rope 728 is connectable to the worker's clothing. By connecting the lower end of the rope 728 to the worker's clothing, the worker is prevented from falling from the counterweight replacement scaffolding device 7.

The first variable scaffold 706 further has a rotating shaft support member 729. The rotating shaft support member 729 is fixed to the end of the first rotating shaft 709 on the landing 6 side. The rotating shaft support member 729 is attached to a portion of the first counterweight guide rail 401 below the portion to which the first fixed portion 712 is attached. The first rotating shaft 709 is supported by the rotating shaft support member 729 by the rotating shaft support member 729 being attached to the first counterweight guide rail 401. This prevents the first rotating shaft 709 from tilting relative to the horizontal plane. The rotating shaft support member 729 may be fixed to the first counterweight guide rail 401. An example of a member for fixing the rotating shaft support member 729 to the first counterweight guide rail 401 is a rail clip.

The first variable scaffold 706 further includes a support section support member 730. The support section support member 730 is fixed to the end of the support section 710 on the landing 6 side. The support section support member 730 is attached to a portion of the second counterweight guide rail 402 that is lower than the portion to which the second fixing section 713 is attached. The support section support member 730 is supported by the support section support member 730 by being attached to the second counterweight guide rail 402. This prevents the support section 710 from tilting relative to the horizontal plane. The support section support member 730 may be fixed to the second counterweight guide rail 402. An example of a member for fixing the support section support member 730 to the second counterweight guide rail 402 is a rail clip.

The second variable scaffold 707 further includes a rotating shaft support member 731. The rotating shaft support member 731 is fixed to the end of the first rotating shaft 718 on the landing 6 side. The rotating shaft support member 731 is attached to a portion of the first counterweight guide rail 401 below the portion to which the first fixed portion 721 is attached. The first rotating shaft 718 is supported by the rotating shaft support member 731 by the rotating shaft support member 731 being attached to the first counterweight guide rail 401. This prevents the first rotating shaft 718 from tilting relative to the horizontal plane. The rotating shaft support member 731 may be fixed to the first counterweight guide rail 401. An example of a member for fixing the rotating shaft support member 731 to the first counterweight guide rail 401 is a rail clip.

The second variable scaffold 707 further includes a support section support member 732. The support section support member 732 is fixed to the end of the support section 719 on the landing 6 side. The support section support member 732 is attached to a portion of the second counterweight guide rail 402 that is lower than the portion to which the second fixed section 722 is attached. The support section support member 732 is attached to the second counterweight guide rail 402, so that the support section 719 is supported by the support section support member 732. This prevents the support section 719 from tilting relative to the horizontal plane. The support section support member 732 may be fixed to the second counterweight guide rail 402. An example of a member for fixing the support section support member 732 to the second counterweight guide rail 402 is a rail clip.

Figure 4 is a diagram showing the state in which the scaffold boards 711 and 720 in Figure 3 are bent. Figure 5 is a diagram showing the state in which the scaffold boards 711 and 720 in Figure 3 are in the storage position. The scaffold board 711 moves between the installation position and the storage position by rotating around the first rotation axis 709. When the position of the scaffold board 711 is the installation position, the scaffold board 711 is provided across the first rotation axis 709 and the support part 710, and faces the fixed scaffold 701 in the height direction. On the other hand, when the position of the scaffold board 711 is the storage position, the position of the scaffold board 711 is shifted from the installation position. Specifically, when the position of the scaffold board 711 is the storage position, the position of the scaffold board 711 is shifted from the movement path of the counterweight frame 301 when the counterweight frame 301 is transported.

The scaffold board 720 moves between the installation position and the storage position by rotating around the first rotation axis 718. When the position of the scaffold board 720 is the installation position, the scaffold board 720 is provided across the first rotation axis 718 and the support part 719, and faces the fixed scaffold 701 in the height direction. On the other hand, when the position of the scaffold board 720 is the storage position, the position of the scaffold board 720 is shifted from the installation position. Specifically, when the position of the scaffold board 720 is the storage position, the position of the scaffold board 720 is shifted from the movement path of the counterweight frame 301 when the counterweight frame 301 is transported out.

When the position of each scaffold board 711 is the installation position, the scaffold boards 711 are arranged side by side from the counterweight guide rail 4 toward the landing 6. When the position of each scaffold board 711 is the installation position, the scaffold board 711 is not arranged above the end of the fixed scaffold board 705 on the landing 6 side. This allows a worker standing on the fixed scaffold board 705 to easily climb onto the scaffold board 711, and a worker standing on the scaffold board 711 to easily descend onto the fixed scaffold board 705.

When the position of each scaffold board 720 is the installation position, the scaffold boards 720 are arranged side by side from the counterweight guide rail 4 toward the landing 6. When the position of each scaffold board 711 is the installation position and the position of each scaffold board 720 is the installation position, no scaffold board 720 is arranged above one of the multiple scaffold boards 711 that is arranged on the landing 6 side. This allows a worker standing on the scaffold board 711 to easily climb onto the scaffold board 720, and a worker standing on the scaffold board 720 to easily descend onto the scaffold board 711.

When the position of each scaffold board 711 is the installation position and the position of each scaffold board 720 is the installation position, the fixed scaffold 701, the first adjustable scaffold 706 and the second adjustable scaffold 707 are arranged as a whole in a so-called stepped shape.

The scaffold board 711 is suspended from the first rotation axis 709 when the position of the scaffold board 711 is the stored position. The scaffold board 720 is suspended from the first rotation axis 718 when the position of the scaffold board 720 is the stored position.

Next, a method for replacing a counterweight using the scaffolding device 7 for replacing a counterweight according to embodiment 1 will be described. Figure 6 is a flowchart showing the method for replacing a counterweight according to embodiment 1.

First, in step S101, the worker performs the scaffolding device installation process. In the scaffolding device installation process, the worker installs the fixed scaffolding 701 in the elevator 5, attaches the first adjustable scaffolding 706 and the second adjustable scaffolding 707 to a pair of counterweight guide rails 4, and positions the scaffolding boards 711 and 720 in their installation positions.

Then, in step S102, the worker performs the counterweight moving process. In the counterweight moving process, the worker moves the existing counterweight 3 to a position corresponding to the landing 6.

After that, in step S103, the worker performs the adjustment weight piece removal process. In the adjustment weight piece removal process, the worker removes the multiple adjustment weight pieces 302 placed on the counterweight frame 301 of the existing counterweight 3 from the counterweight frame 301. When removing the upper adjustment weight piece 302 of the multiple adjustment weight pieces 302, the worker stands on the scaffold board 720. When removing the adjustment weight piece 302 in the middle of the height direction of the multiple adjustment weight pieces 302, the worker stands on the scaffold board 711. When removing the lower adjustment weight piece 302 of the multiple adjustment weight pieces 302, the worker stands on the fixed scaffold board 705.

Then, in step S104, the worker performs the scaffold board storage process. In the scaffold board storage process, the worker moves each of the scaffold boards 711 and 720 from the installation position to the storage position.

Then, in step S105, the worker performs the counterweight frame replacement process. In the counterweight frame replacement process, the worker removes the counterweight frame 301 of the existing counterweight 3 from the hoistway 5 and carries the counterweight frame 301 of the new counterweight 3 into the hoistway 5.

Then, in step S106, the worker performs the scaffold board installation process. In the scaffold board installation process, the worker moves each of the scaffold boards 711 and 720 from the storage position to the installation position.

After that, in step S107, the worker performs the adjustment weight piece delivery process. In the adjustment weight piece delivery process, the worker attaches the multiple adjustment weight pieces 302 to the counterweight frame 301 of the newly installed counterweight 3. When the adjustment weight piece 302 located at the bottom of the multiple adjustment weight pieces 302 is delivered, the worker stands on the fixed scaffold board 705. When the adjustment weight piece 302 located at the middle of the height of the multiple adjustment weight pieces 302 is delivered, the worker stands on the scaffold board 711. When the adjustment weight piece 302 located at the top of the multiple adjustment weight pieces 302 is delivered, the worker stands on the scaffold board 720.

After that, in step S108, the worker performs the scaffolding device removal process. In the scaffolding device removal process, the worker removes the first adjustable scaffolding 706 and the second adjustable scaffolding 707 from the pair of counterweight guide rails 4, and removes the fixed scaffolding 701 from the hoistway 5. This completes the work of replacing the counterweight.

As described above, the scaffolding device 7 for replacing a counterweight according to the first embodiment includes a fixed scaffolding 701 and a variable scaffolding 702. The fixed scaffolding 701 is installed in the hoistway 5. The variable scaffolding 702 is provided above the fixed scaffolding 701 and is attached to a pair of counterweight guide rails 4. The fixed scaffolding 701 is disposed in the hoistway 5 so as to be adjacent to the landing 6. The variable scaffolding 702 has a first rotating shaft 709 attached to the first counterweight guide rail 401, a support part 710 attached to the second counterweight guide rail 402, and a scaffolding board 711 rotatably provided on the first rotating shaft 709. The scaffolding board 711 rotates around the first rotating shaft 709, so that the scaffolding board 711 moves between the installation position and the storage position. When the position of the scaffolding board 711 is the installation position, the scaffolding board 711 is provided across the first rotation shaft 709 and the support part 710, and faces the fixed scaffolding 701 in the height direction. When the position of the scaffolding board 711 is the storage position, the scaffolding board 711 is positioned offset from the installation position. As a result, when the existing counterweight frame 301 is transported from the hoistway 5 to the landing 6 after removing the adjustment weight piece 302 from the existing counterweight frame 301, it is not necessary to remove the variable scaffolding 702 from the hoistway 5. Therefore, the adjustment weight piece 302 can be easily attached to the new counterweight frame 301. As a result, the efficiency of the replacement work of the counterweight 3 can be improved.

The scaffolding board 711 also has a first scaffolding piece 714 provided on the first rotation axis 709, a second rotation axis 715 provided on the first scaffolding piece 714, and a second scaffolding piece 716 that rotates around the second rotation axis 715. When the second scaffolding piece 716 rotates around the second rotation axis 715, the shape of the scaffolding board 711 changes between a flat shape and a curved shape. When the scaffolding board 711 has a flat shape, the first scaffolding piece 714 and the second scaffolding piece 716 are arranged along the same plane. When the scaffolding board 711 has a curved shape, the first scaffolding piece 714 and the second scaffolding piece 716 are arranged along different planes. When the scaffold board 711 has a flat shape, the radial dimension of the first rotating shaft 709 of the scaffold board 711 is larger than the dimension between the first rotating shaft 709 and the support part 710. When the scaffold board 711 has a curved shape, the radial dimension of the first rotating shaft 709 of the scaffold board 711 is smaller than the dimension between the first rotating shaft 709 and the support part 710. This allows the scaffold board 711 to be moved between the installation position and the storage position with a simple configuration.

The scaffolding board 720 also has a first scaffolding piece 723 provided on the first rotating shaft 718, a second rotating shaft 724 provided on the first scaffolding piece 723, and a second scaffolding piece 725 that rotates around the second rotating shaft 724. When the second scaffolding piece 725 rotates around the second rotating shaft 724, the shape of the scaffolding board 720 changes between a flat shape and a curved shape. When the scaffolding board 720 has a flat shape, the first scaffolding piece 723 and the second scaffolding piece 725 are arranged along the same plane. When the scaffolding board 720 has a curved shape, the first scaffolding piece 723 and the second scaffolding piece 725 are arranged along different planes. When the scaffold board 720 has a flat shape, the radial dimension of the first rotating shaft 718 of the scaffold board 720 is larger than the dimension between the first rotating shaft 718 and the support part 719. When the scaffold board 720 has a curved shape, the radial dimension of the first rotating shaft 718 of the scaffold board 720 is smaller than the dimension between the first rotating shaft 718 and the support part 719. This allows the scaffold board 720 to be moved between the installation position and the storage position with a simple configuration.

In addition, when the scaffold board 711 is in the stored position, it is suspended from the first rotation shaft 709. This eliminates the need to fix the scaffold board 711 in the stored position to the counterweight guide rail 4. Therefore, the position of the scaffold board 711 can be easily maintained in the stored position.

In addition, when the scaffold board 720 is in the stored position, it is suspended from the first rotating shaft 718. This eliminates the need to fix the scaffold board 720 in the stored position to the counterweight guide rail 4. Therefore, the position of the scaffold board 720 can be easily maintained in the stored position.

The counterweight replacement method according to the first embodiment includes a scaffolding device installation process, a counterweight movement process, an adjustment weight piece removal process, a scaffolding board storage process, and a counterweight frame replacement process. The counterweight replacement method also includes a scaffolding board installation process, an adjustment weight piece delivery process, and a scaffolding device removal process. In the scaffolding device installation process, the fixed scaffolding 701 is installed in the elevator 5, the adjustable scaffolding 702 is attached to a pair of counterweight guide rails 4, and the scaffolding boards 711 and 720 are each positioned at their installation positions. In the counterweight movement process, the existing counterweight 3 is moved to a position corresponding to the landing 6. In the adjustment weight piece carrying out process, after the scaffolding device installation process and the counterweight moving process, the plurality of adjustment weight pieces 302 placed on the counterweight frame 301 of the existing counterweight 3 are removed from the counterweight frame 301. In the scaffolding board storage process, after the adjustment weight piece carrying out process, the scaffolding board 711 and the scaffolding board 720 are moved from the installation position to the storage position. In the counterweight frame replacement process, after the scaffolding board storage process, the counterweight frame 301 of the existing counterweight 3 is carried out from the hoistway 5, and the counterweight frame 301 of the new counterweight 3 is carried into the hoistway 5. In the scaffolding board installation process, after the counterweight frame replacement process, the scaffolding board 711 and the scaffolding board 720 are moved from the storage position to the installation position. In the adjustment weight piece delivery process, after the scaffold board installation process, multiple adjustment weight pieces 302 are attached to the counterweight frame 301 of the new counterweight 3. In the scaffold device removal process, after the adjustment weight piece delivery process, the adjustable scaffold 702 is removed from the pair of counterweight guide rails 4, and the fixed scaffold 701 is removed from the hoistway. This improves the efficiency of the counterweight 3 replacement work.

1 cage, 2 cage guide rail, 3 counterweight, 4 counterweight guide rail, 5 elevator, 6 landing, 7 scaffolding device for replacing counterweight, 301 counterweight frame, 302 adjustment weight piece, 401 first counterweight guide rail, 402 second counterweight guide rail, 701 fixed scaffolding, 702 adjustable scaffolding, 703 worker safety device, 704 fixed part, 705 fixed scaffolding board, 706 first adjustable scaffolding, 707 second adjustable scaffolding, 708 fixed part, 709 first rotating shaft, 710 support part, 711 scaffolding board, 712 first fixed part, 713 second fixed part, 714 first scaffolding piece, 715 second rotating shaft, 716 Second scaffolding piece, 717 fixed part, 718 first rotating shaft, 719 support part, 720 scaffolding board, 721 first fixed part, 722 second fixed part, 723 first scaffolding piece, 724 second rotating shaft, 725 second scaffolding piece, 726 fixed part, 727 support rod, 728 rope, 729 rotating shaft support member, 730 support part support member, 731 rotating shaft support member, 732 support part support member.

Claims (4)

A fixed scaffold installed in the elevator;
A variable scaffold provided above the fixed scaffold and attached to a pair of counterweight guide rails;
Equipped with
The fixed scaffold is disposed in the hoistway adjacent to the landing,
The variable scaffolding includes:
a first rotating shaft attached to one of the pair of counterweight guide rails;
a support portion attached to the other of the pair of counterweight guide rails;
A scaffolding board rotatably provided on the first rotation axis;
having
The scaffolding board rotates around the first rotation axis, and moves between an installation position that is disposed across the first rotation axis and the support portion and faces the fixed scaffolding in the height direction, and a storage position that is shifted from the installation position. This scaffolding device for replacing counterweights. The scaffolding board has a first scaffolding piece provided on the first rotation axis, a second rotation axis provided on the first scaffolding piece, and a second scaffolding piece rotating around the second rotation axis,
The shape of the scaffold board is deformed between a flat shape in which the first scaffold piece and the second scaffold piece are arranged along the same plane and a bent shape in which the first scaffold piece and the second scaffold piece are arranged along different planes by rotating the second scaffold piece around the second rotation axis,
When the shape of the scaffold board is the flat plate shape, a radial dimension of the first rotation axis of the scaffold board is larger than a dimension between the first rotation axis and the support part,
The scaffolding device for replacing counterweights as described in claim 1, wherein when the shape of the scaffolding board is the bent shape, the radial dimension of the first rotation axis of the scaffolding board is smaller than the dimension between the first rotation axis and the support portion. The scaffolding device for replacing counterweights according to claim 1 or 2, wherein the scaffolding board is suspended from the first rotation axis when the position of the scaffolding board is the storage position. A counterweight replacement method for replacing a counterweight using the counterweight replacement scaffolding device according to any one of claims 1 to 3, comprising:
A scaffolding device installation process of installing the fixed scaffolding in the elevator, attaching the adjustable scaffolding to a pair of the counterweight guide rails, and setting the position of the scaffolding board to the installation position;
a counterweight moving step of moving the existing counterweight to a position corresponding to the landing;
an adjustment weight piece carrying-out process of removing a plurality of adjustment weight pieces placed on the counterweight frame of the existing counterweight from the counterweight frame after the scaffolding device installation process and the counterweight moving process;
After the adjustment weight piece carrying-out process, a scaffolding board storage process of moving the position of the scaffolding board from the installation position to the storage position;
After the scaffold board storage step, a counterweight frame replacement step of carrying out the counterweight frame of the existing counterweight from the hoistway and carrying the counterweight frame of the newly installed counterweight into the hoistway;
After the counterweight frame replacement step, a scaffold board installation step of moving the position of the scaffold board from the storage position to the installation position;
After the scaffolding board installation process, an adjustment weight piece delivery process is performed to attach a plurality of adjustment weight pieces to the counterweight frame of the newly installed counterweight;
After the adjustment weight piece delivery step, a scaffolding device removal step of removing the adjustable scaffolding from the pair of counterweight guide rails and removing the fixed scaffolding from the elevator;
A method for replacing a counterweight comprising the steps of: