JP2024054958A - Lifting device and construction method using the lifting device - Google Patents

Abstract

[Problem] To provide a lifting device and a construction method using the lifting device that can improve workability. [Solution] The lifting device comprises a base that can be installed on an installation surface, a number of legs that extend vertically upward from the base, a support part supported by each of the number of legs, and a connecting part that is supported in a suspended state by a wire from the support part and can be connected to a liner plate. While suspended from the support part by the wire, the connecting part rises by winding up the wire in response to the driving force from the drive part, and descends by unwinding the wire in response to the driving force from the drive part. [Selected Figure] Figure 1

Description

The present invention relates to a lifting device and a construction method using the lifting device.

Conventionally, liner plates are installed as soil retaining members, for example on the inner wall surface of a shaft being excavated. By connecting multiple liner plates together vertically, multiple liner plates are installed vertically on the inner wall surface of the shaft.

The general construction method for such multiple liner plates is to connect them inside the shaft, but this is not very convenient for users. Therefore, as shown in Patent Document 1, for example, a construction method has been disclosed in which the plates are connected vertically on the ground outside the shaft, and then installed inside the shaft while suspended by a crane.

JP 2011-58189 A

However, in this type of construction method, multiple liner plates are connected in the vertical direction, so heavy machinery such as a crane is required to install the liner plates. In this way, when installing heavy machinery, space is required around it, so it is desirable to improve workability by saving space.

The lifting device that solves the above problem includes a base that can be installed on an installation surface, a number of legs that extend vertically upward from the base, a support part supported by each of the legs, and a connecting part that is supported in a suspended state by a wire from the support part and can be connected to a liner plate, and the connecting part rises by winding up the wire in response to the driving force from the drive part while suspended from the support part by the wire, and descends by unwinding the wire in response to the driving force from the drive part.

A construction method using a lifting device that solves the above problem is a construction method using a lifting device that includes a base that can be installed on an installation surface, multiple legs extending vertically upward from the base, a support part supported by each of the multiple legs, and a connecting part that is supported in a suspended state by a wire from the support part and can be connected to a liner plate, and includes connecting the connecting part to the upper end of the liner plate, lifting the connecting part by winding up the wire in response to the driving force from the driving part, and lowering the connecting part by unwinding the wire in response to the driving force from the driving part.

The present invention can improve workability.

FIG. FIG. FIG. FIG. 10 is a flowchart showing a lowering process using the lifting device. FIG. 13 is a schematic diagram showing a construction method using a lifting device. FIG. 13 is a schematic diagram showing a construction method using a lifting device. FIG. 13 is a schematic diagram showing a construction method using a lifting device. 10 is a flowchart showing a lifting process using a lifting device.

[Embodiment]
An embodiment of a lifting device and a construction method using the lifting device will be described below. In the following description, a direction intersecting with the vertical direction Z is defined as a radial direction X, and a direction intersecting with the vertical direction Z and the radial direction X is defined as a circumferential direction Y. The direction toward the outside of the radial direction X is defined as an outer radial direction X1, and the direction toward the inside of the radial direction X is defined as an inner radial direction X2. The upper side of the vertical direction Z is defined as an upper direction Z1, and the lower side of the vertical direction Z is defined as a lower direction Z2. The direction including the radial direction X and the circumferential direction Y is defined as a horizontal direction.

<Lifting device 10>
1, the lifting device 10 is configured to lift and lower the liner plate unit 90 in the vertical direction Z. In particular, the lifting device 10 is configured to lift and lower the liner plate unit 90 in the vertical direction Z while being coupled to an upper end portion 90A of the liner plate unit 90.

The liner plate unit 90 may be used, for example, as a retaining member that can be installed on the inner wall surface of a shaft being excavated. The liner plate unit 90 may be cylindrical.

The liner plate unit 90 comprises multiple liner plates 91. For convenience, three liner plates 91A to 91C are shown in the figure, but this is not limited to this. Each of the multiple liner plates 91 can be connected in the vertical direction Z. This allows the multiple liner plates 91 to be extended in the vertical direction Z. In other words, the liner plates 91 can be used by being connected in the vertical direction Z. The liner plate 91 may also be formed by connecting multiple members in the circumferential direction Y.

<Connecting portion 11>
The lifting device 10 includes a connecting portion 11. The connecting portion 11 is configured to be connectable to an upper end portion 90A of the liner plate unit 90 from the upper side Z1. That is, the connecting portion 11 is configured to be connectable to a liner plate 91.

The connecting portion 11 includes a connecting frame 21. The connecting frame 21 may be annular in plan view. The connecting frame 21 is configured to be connectable to the upper end 90A of the liner plate unit 90 from above Z1. The connecting frame 21 may be configured by connecting multiple arc-shaped members in plan view. This makes it easy to carry the connecting frame 21. The connecting frame 21 is configured by connecting three arc-shaped members in plan view, but is not limited to this.

The connecting portion 11 includes a first pulley housing 22 and a first pulley 23. That is, the connecting portion 11 includes the first pulley 23. The first pulley housing 22 is provided so as to protrude upward Z1 from the connecting frame 21. The first pulley housing 22 is configured to rotatably house the first pulley 23. That is, the first pulley 23 is housed above Z1 of the connecting frame 21.

The first pulley 23 can be wound with the wire 14. The first pulley 23 can rotate about a rotation axis along the radial direction X. The first pulley 23 is configured to guide the wire 14 in the vertical direction Z. The first pulley 23 is a pulley for routing the wire 14 between the connecting portion 11 and the support portion 35 described later.

<Lifting section 12>
The lifting device 10 includes a lifting unit 12. The lifting unit 12 is configured to support the connecting unit 11 so that it can be raised and lowered using a wire 14. In particular, with the connecting unit 11 suspended by the wire 14, the lifting unit 12 lifts the connecting unit 11 by winding up the wire 14 in response to a driving force from the driving unit 13. With the connecting unit 11 suspended by the wire 14, the lifting unit 12 lowers the connecting unit 11 by unwinding the wire 14 in response to the driving force from the driving unit 13.

The lifting section 12 includes a base 31. That is, the lifting device 10 includes a base 31. The base 31 may be configured to be annular in plan view. The base 31 may be configured by connecting multiple arc-shaped members in plan view. This makes it easy to carry the base 31. The base 31 is configured by connecting three arc-shaped members in plan view, but is not limited to this. The base 31 can be installed on an installation surface 99. The installation surface 99 may be the ground.

The base 31 has a plurality of abutment surfaces 31A. The base 31 has three abutment surfaces 31A, but is not limited to this. Each of the plurality of abutment surfaces 31A is a surface facing upward Z1 in the vertical direction Z. Each of the plurality of abutment surfaces 31A can abut against the support member 92. The support member 92 may be detachably provided on the outer peripheral surface of the liner plate unit 90. The support member 92 is attached so as to protrude from the outer peripheral surface of the liner plate unit 90 in the outer diameter direction X1. In this way, each of the plurality of abutment surfaces 31A is configured to abut against the support member 92, thereby temporarily supporting the liner plate unit 90 via the support member 92.

The lifting unit 12 has a plurality of legs 32. That is, the lifting device 10 has a plurality of legs 32. The lifting unit 12 has three legs 32, but is not limited to this. Each of the plurality of legs 32 can be connected to the base 31 so as to protrude upward Z1 from the base 31. Each of the plurality of legs 32 extends upward Z1 from the base 31. Each of the plurality of legs 32 is inclined in the inner radial direction X2 toward the upward Z1, but does not have to be inclined in the inner radial direction X2.

Each of the multiple legs 32 is spaced apart by a predetermined distance in the circumferential direction Y. In other words, a space is provided between the multiple legs 32. The space provided between the multiple legs 32 is a space in which the liner plate member constituting the liner plate 91 can be inserted and removed from the base 31.

Each of the multiple legs 32 includes a pulley housing 33 and a pulley 34. The pulley housing 33 is provided so as to protrude upward Z1 from each of the multiple legs 32. The pulley housing 33 is configured to rotatably house the pulley 34.

The pulley 34 is housed in the pulley housing 33. The pulley 34 only needs to be housed in the pulley housing 33 provided in the leg 32 close to the drive unit 13 described later. The wire 14 can be wound around the pulley 34. The pulley 34 can rotate about a rotation axis along the circumferential direction Y. The pulley 34 is a pulley for routing the wire 14 between the drive unit 13 described later and the support unit 35 described later.

The lifting section 12 includes a support section 35. That is, the lifting device 10 includes a support section 35. The support section 35 may be configured to have a circular ring shape in a plan view. The support section 35 may be configured by connecting multiple arc-shaped members in a plan view. This makes it easy to carry the support section 35. The support section 35 is configured by connecting three arc-shaped members in a plan view, but is not limited to this.

The support portion 35 is located above the multiple legs 32 at Z1. The support portion 35 can be connected to each of the multiple legs 32. The support portion 35 is configured to be supported by each of the multiple legs 32. The support portion 35 is located above the connecting portion 11 at Z1. The support portion 35 can support the connecting portion 11 in a state in which it is suspended by the wire 14.

<Drive unit 13>
The lifting device 10 includes a drive unit 13. The drive unit 13 may be detachable from the lifting unit 12. The drive unit 13 is a drive source for lifting and lowering the connecting unit 11. The drive unit 13 may include an electric winch. The drive unit 13 may be a mechanical winch, or may be a hydraulic winch.

<Wire 14>
The wire 14 can be wound around the drive unit 13 by the drive unit 13. The wire 14 can be unwound from the drive unit 13 by the drive unit 13. The wire 14 is routed from the drive unit 13 along any one of the multiple legs 32 to the support unit 35. The wire 14 is routed in a circular shape along the support unit 35 at the support unit 35. In particular, the wire 14 is routed between the support unit 35 and the connecting unit 11 at a position where the support unit 35 is connected to each of the multiple legs 32. Specifically, the wire 14 may support the connecting unit 11 so as to suspend it from three points of the support unit 35. The wire 14 may support the connecting unit 11 so as to suspend it from multiple points of the support unit 35, for example, two points or four or more points of the support unit 35. In this way, the connecting unit 11 can be suspended from multiple points of the support unit 35 using one wire 14. The tip of the wire 14 may be fixed to the connecting portion 11 , or may be fixed to the support portion 35 .

<Functions of the lifting device 10>
In this manner, the connecting portion 11 is supported in a state in which it is suspended by the wire 14 from the support portion 35. In a state in which the connecting portion 11 is suspended from the support portion 35 by the wire 14, the connecting portion 11 is lifted by winding up the wire 14 in response to the driving force from the drive portion 13. In this way, the lifting device 10 lifts the liner plate 91 connected to the connecting portion 11.

Meanwhile, the connecting part 11, suspended from the support part 35 by the wire 14, is lowered by unwinding the wire 14 in response to the driving force from the drive part 13. As a result, the lifting device 10 lowers the liner plate 91 connected to the connecting part 11.

<Shapes of the base 31 and the support portion 35>
2, the outer diameter D11 of the support portion 35 is shorter than the outer diameter D21 of the base 31. In particular, the outer diameter D11 of the support portion 35 may be shorter than the inner diameter D22 of the base 31. Therefore, the support portion 35 can be stably installed on the installation surface 99 by the base 31 even in a state in which the connecting portion 11 is suspended by the wire 14. In addition to this, by making the outer diameter D11 of the support portion 35 as short as possible, it is possible to save space in the vertical direction Z by installing the lifting device 10.

The outer diameter of the connecting frame 21 may be the same as the outer diameter D11 of the support portion 35. In other words, the outer diameter of the connecting frame 21 is shorter than the inner diameter D22 of the base 31. Therefore, even if excavation is performed downward Z2 inside the base 31 while the base 31 is installed on the installation surface 99, the connecting frame 21 can pass through the inside of the base 31 in the vertical direction Z.

<Configuration of Support Part 35>
The support portion 35 also includes a communication passage 36. The communication passage 36 is a passage that extends in the circumferential direction Y along the support portion 35. The communication passage 36 is divided by an inner wall surface of the support portion 35. A portion of the communication passage 36 is exposed from the outer peripheral surface of the support portion 35 when viewed from the outer diameter direction X1 side, but does not have to be exposed from the outer peripheral surface of the support portion 35. The communication passage 36 is capable of housing the wire 14.

As shown in Figures 2 and 3, the support part 35 includes a second pulley 37. The second pulley 37 is housed in the communication passage 36. The wire 14 can be wound around the second pulley 37. The second pulley 37 can rotate about a rotation axis extending in the vertical direction Z. The second pulley 37 guides the wire 14 along the circumferential direction Y. In other words, the second pulley 37 guides the wire 14 along the horizontal direction. The second pulley 37 is a pulley for routing the wire 14 within the communication passage 36 of the support part 35.

As shown in Figures 2 and 4, the support part 35 includes a third pulley 38. The third pulley 38 is housed in the communication passage 36. The third pulley 38 can be wound with the wire 14. The third pulley 38 can rotate about a rotation axis extending in the radial direction X. The third pulley 38 guides the wire 14 along the vertical direction Z. The third pulley 38 is a pulley for routing the wire 14 between the connection part 11 and the support part 35.

The support portion 35 has a through hole 39. The through hole 39 is provided below the support portion 35, Z2. The through hole 39 opens so as to penetrate between the inside and the outside of the communication passage 36. The through hole 39 is provided on the circumferential direction Y side of the third pulley 38. The through hole 39 allows the wire 14 to pass through. The through hole 39 allows the wire 14 to pass between the first pulley 23 and the third pulley 38.

<Downward process using lifting device 10>
5 to 8, a description will be given of a lowering step for lowering the liner plate 91 as a construction method using the lifting device 10. The lowering step is a step for lowering the liner plate 91 by lowering the connecting part 11 by unwinding the wire 14 in response to a driving force from the driving part 13. The order of each of the subsequent steps can be arbitrarily changed within the scope of not departing from the purpose of each step.

As shown in Figures 5 and 6, in step S11, a lifting unit installation process is performed. In this process, the lifting unit 12 is installed on an installation surface 99. In more detail, a base 31 is formed by connecting multiple members. Then, multiple legs 32 are connected to the upper Z1 of the base 31. Next, a support unit 35 is connected to the upper Z1 of the multiple legs 32. In more detail, a support unit 35 is formed by connecting multiple members.

Next, in step S12, an initial excavation step is performed. In this step, the inside of the base 31 is excavated downward Z2 to form a vertical shaft 98.
Next, in step S13, a plate installation process is performed. In this process, the liner plate 91 is installed in the vertical shaft 98. More specifically, the components constituting the liner plate 91 are carried into the inside of the base 31 between the multiple legs 32. Then, in the vertical shaft 98, the components constituting the liner plate 91 are connected to each other, thereby installing the liner plate 91.

Next, in step S14, a connecting part installation process is performed. In this process, the connecting part 11 is connected to the upper end of the liner plate 91 installed in the vertical shaft 98. In detail, the members that make up the connecting part 11 are brought into the inside of the base 31 between the multiple legs 32. The connecting part 11 is formed by connecting multiple members. Such a connecting part 11 is connected to the upper end of the liner plate 91.

Then, the connecting part 11 is installed on the lifting part 12. In particular, the connecting part 11 and the lifting part 12 are wrapped with a wire 14, so that the connecting part 11 is installed so as to be suspended from the lifting part 12. In other words, the connecting part installation process is a process of connecting the connecting part 11 to the upper end of the liner plate 91.

Next, as shown in Figures 5 and 7, in step S15, a connecting part raising process is performed. In this process, the wire 14 is wound up in response to the driving force from the drive unit 13, and the connecting part 11 connected to the upper end of the liner plate 91 rises upward Z1. This causes the liner plate 91 to rise from the vertical shaft 98.

Then, a support member 92 is attached to the outer peripheral surface of the liner plate 91. When the wire 14 is unwound in response to the driving force from the drive unit 13, the connecting unit 11 connected to the upper end of the liner plate 91 descends downward Z2. As a result, the support member 92 abuts against the base 31 from above Z1, and the liner plate 91 is installed so as to abut against the base 31.

Next, in step S16, an excavation process is performed. In this process, the inside of the base 31 is excavated further downward Z2 to form a vertical shaft 98 that extends downward Z2. To facilitate understanding of the invention, step S16 is described as a process prior to the execution of steps S17 to S21, but in reality, step S16 may be a process parallel to steps S17 to S21. In other words, even while the excavation process is being performed in the vertical shaft 98, the liner plates 91 can be connected on the ground, as will be described in detail later. This improves workability.

Next, in step S17, a connecting portion removal process is performed. In this process, the connecting portion 11 is removed from the upper end of the liner plate 91 while the liner plate 91 is in place. Then, the wire 14 is wound up in response to the driving force from the drive unit 13, causing the connecting portion 11 to rise upward Z1.

Next, as shown in Figures 5 and 8, in step S18, a plate connecting process is performed. In this process, a new liner plate 91 is connected above Z1 of an already installed liner plate 91. As a specific example, if the already installed liner plate 91 is the first liner plate and the new liner plate 91 is the second liner plate, the second liner plate is connected above Z1 of the first liner plate. This connects multiple liner plates 91 along the vertical direction Z.

Next, in step S19, a connecting portion connection process is performed. In this process, the wire 14 is unwound in response to the driving force from the drive unit 13, and the connecting portion 11 descends downward Z2. Then, on the ground, the connecting portion 11 is connected to the upper end of the newly connected liner plate 91.

Next, in step S20, the connecting part lowering process is performed. In this process, the wire 14 is wound up in response to the driving force from the drive unit 13, so that the connecting part 11 connected to the upper end of the liner plate 91 rises upward Z1, and the support member 92 is slightly raised above the base 31. Then, after the support member 92 is removed from the first liner plate, the support member 92 is attached to the outer peripheral surface of the second liner plate.

Then, the wire 14 is unwound in response to the driving force from the drive unit 13, and the connecting unit 11 descends downward Z2. As a result, the support member 92 abuts against the base 31 from above Z1, and the liner plate 91 is installed so as to abut against the base 31.

Next, in step S21, if excavation is not complete, the process moves to step S16 again. This allows steps S16 to S20 to be repeated to extend the shaft 98 downward Z2 by excavation, while installing multiple liner plates 91 in the downward Z2. In step S21, if excavation is complete, the lowering process ends.

<Lifting process using lifting device 10>
Next, referring to Fig. 9, a lifting process for lifting the liner plate 91 will be described as a construction method using the lifting device 10. The lifting process is a process for lifting the liner plate 91 by lifting the connecting portion 11 by winding the wire 14 in response to a driving force from the driving portion 13. In particular, the lifting process may be performed when a plurality of liner plates 91 are connected in the vertical direction Z. The lifting process is a process in which the order of the lowering process is reversed, and a description of the process that overlaps with the lowering process will be omitted.

As shown in FIG. 9, in step S31, a connecting portion connecting process is performed in the same manner as in step S19. That is, when multiple liner plates 91 are connected in the vertical direction Z, the connecting portion 11 is connected to the upper end of the liner plate 91 that is located at the uppermost position Z1 in the vertical direction Z among the multiple liner plates 91.

Next, in step S32, a connecting part raising process is performed. In this process, the wire 14 is wound up in response to the driving force from the drive unit 13, and the connecting part 11 connected to the upper end of the liner plate 91 rises upward Z1. This causes the liner plate 91 to rise from the vertical shaft 98.

Then, a support member 92 is attached to the outer peripheral surface of the second liner plate 91 from the top Z1. When the wire 14 is unwound in response to the driving force from the drive unit 13, the connecting unit 11 connected to the upper end of the liner plate 91 descends downward Z2. As a result, the support member 92 abuts against the base 31 from the top Z1, and the second liner plate 91 from the top Z1 is installed so as to abut against the base 31.

Next, in step S33, a connecting portion removal process is performed in the same manner as in step S17. That is, when multiple liner plates 91 are connected in the vertical direction Z, the connecting portion 11 is removed from the upper end of the liner plate 91 located at the uppermost position Z1 in the vertical direction Z while the liner plates 91 are in the installed state.

Then, in step S34, a plate recovery process is performed. In this process, the liner plate 91 located at the top Z1 is removed and recovered. In other words, when multiple liner plates 91 are connected in the vertical direction Z, the liner plate 91 located at the top Z1 in the vertical direction Z is removed and then recovered while the liner plates 91 are installed.

Next, in step S35, if recovery is not complete, the process moves back to step S31. As a result, steps S31 to S34 are repeatedly performed to pull the liner plates 91 up from the shaft 98, and the liner plates 91 are sequentially recovered starting from the liner plate 91 located at the top Z1. In step S35, if recovery is complete, a connection part recovery process is performed in step S36 to recover the connection part 11. Then, in step S37, a lifting part recovery process is performed in which the lifting part 12 is recovered.

<Actions and Effects of the Present Embodiment>
The operation and effects of this embodiment will be described.
(1) The lifting device 10 includes a base 31 that can be installed on an installation surface 99, a plurality of legs 32 that extend upward Z1 from the base 31, and a support portion 35 that is supported by each of the plurality of legs 32. The lifting device 10 includes a connecting portion 11 that is supported in a suspended state by a wire 14 from the support portion 35 and can be connected to a liner plate 91. The connecting portion 11 rises by winding the wire 14 in response to a driving force from the drive portion 13 in a suspended state from the support portion 35, and falls by unwinding the wire 14 in response to a driving force from the drive portion 13. Therefore, the liner plate 91 can be installed and the liner plate 91 can be recovered without using heavy machinery. Therefore, it is possible to save space and improve workability.

In particular, in areas where heavy machinery cannot be brought in, such as mountainous regions, and areas where heavy machinery cannot be brought in without being disassembled, saving space has been a significant issue, and this embodiment can solve this problem.

(2) The connecting part 11 can be suspended from three points on the support part 35 using a single wire 14. Therefore, when the connecting part 11 is raised and lowered by winding and unwinding a single wire 14, the inclination of the connecting part 11 with respect to the horizontal plane can be suppressed. This can suppress the contact of the liner plate 91 with the inner wall of the shaft, for example, and the installation and recovery of the liner plate 91 can be performed stably. In particular, when the connecting part 11 can be suspended from three or more points on the support part 35 using a single wire 14, the installation and recovery of the liner plate 91 can be performed stably without the need for another support mechanism that supports the connecting part 11. Therefore, space can be saved, and the workability can be improved accordingly.

(3) The outer diameter D11 of the support portion 35 is shorter than the outer diameter D21 of the base 31. This prevents the lifting device 10 from becoming too large. This saves space and improves workability.

(4) The outer diameter of the connecting frame 21 is shorter than the inner diameter D22 of the base 31. Therefore, when the connecting frame 21 is raised or lowered, the liner plate 91 can be raised or lowered stably by passing through the inner diameter D22 of the base 31. This allows for space saving and improved workability.

(5) The space between the multiple legs 32 allows the components that make up the liner plate 91 to be inserted and removed from the base 31. This allows the components that make up the liner plate 91 to be easily brought into the base 31. This saves space and improves workability.

(6) The first pulley 23 is housed above the connecting frame 21, Z1, and guides the wire 14 along the vertical direction Z. This allows the liner plate 91 to be raised and lowered stably. This saves space and improves workability.

(7) The support portion 35 includes a second pulley 37 that guides the wire 14 along the circumferential direction Y, and a third pulley 38 that guides the wire 14 along the vertical direction Z. This allows the wire 14 to be smoothly routed, allowing the liner plate 91 to be raised and lowered stably. This allows for space saving and improved workability.

(8) The drive unit 13 includes an electric winch. This allows the liner plate 91 to be raised and lowered stably. This saves space and improves workability. In particular, unlike hydraulic jacks, for example, it is possible to save space and further suppress a decrease in workability, for example, in cold regions.

(9) As shown in FIG. 5, by repeating steps S17 to S20 of the lowering process, the liner plate 91 can be smoothly connected in sequence from the upper side Z1, and the liner plate 91 can be smoothly lowered to the lower side Z2. Therefore, it is possible to improve workability by saving space.

(10) In particular, by performing step S16 of the lowering process and steps S17 to S20 of the lowering process in parallel, the work of connecting the liner plates 91 and, for example, the work of excavating a shaft can be performed in parallel. This allows for space saving and improved workability.

To give a specific example, conventionally, step S16 of the lowering process was performed for six hours, and then steps S17 to S20 of the lowering process were performed for two hours, resulting in a total work time of eight hours. On the other hand, in this embodiment, step S16 of the lowering process is performed for six hours, while steps S17 to S20 of the lowering process can be performed for two hours, resulting in a total work time of six hours. Therefore, by saving space, workability can be improved.

(11) As shown in FIG. 9, by repeating steps S31 to S34 of the lifting process, the liner plate 91 can be smoothly lifted to the upper Z1 in sequence, and the liner plate 91 can be smoothly retrieved from the upper Z1. This allows for space saving and improved workability.

[Example of change]
This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

- The lifting device 10 suspends the connecting portion 11 from multiple locations on the support portion 35 using one drive unit 13 and one wire 14, but this is not limited to the above. For example, the lifting device 10 may suspend the connecting portion 11 from one location on the support portion 35 using one drive unit 13 and one wire 14. The connecting portion 11 may be supported by another support mechanism separate from the wire 14 so that it can be raised and lowered. For example, the lifting device 10 may include multiple systems of combinations of one drive unit 13 and one wire 14. In this case, it is preferable that the multiple systems of drive units 13 are linked together.

- The lifting device 10 may be configured to include a support member 92. As a specific example, the base 31 may include a support member 92. The support member 92 may be movable in the radial direction X. The support member 92 may support the liner plate 91 by being positioned at a support position protruding in the inner radial direction X2, and may release support for the liner plate 91 by being positioned at a disengagement position disengaging in the outer radial direction X1.

The base 31 may be rectangular in plan view. The support portion 35 may be rectangular in plan view. The support portion 35 may be configured to protrude from the multiple legs 32 in the inner diameter direction X2. In other words, the support portion 35 only needs to be able to support the connecting portion 11 so as to suspend it from above Z1 via the wire 14.

- The liner plate 91, which can be raised and lowered by the lifting device 10, may not be circular in plan view, but may be rectangular, oval, or horseshoe shaped. In other words, the liner plate 91 may have an arc-shaped area in plan view, an entire area in line shape, or some areas in line shape and some areas in line shape. The liner plate 91 may also be configured to surround some or all of its periphery in plan view.

The liner plate 91 that can be raised and lowered by the lifting device 10 may be made of a material other than a steel plate. In particular, the liner plate 91 is preferably made of a material that is lighter than a steel plate. In addition, the liner plate 91 is preferably made of a material that is not significantly weaker in rigidity than a steel plate. Conventionally, the liner plate itself was heavy, and the handling of the liner plate was not easy. For this reason, it is desired to improve the convenience by making the handling of the liner plate easier. In addition to this, if the liner plate 91 is buried in the ground, not only will the cost increase according to the number of buried liner plates 91, but there is also a risk of affecting the environment. In addition, if the liner plate 91 is rusted by rain getting into it, it may also affect the workers. Therefore, the liner plate 91 may be made of, for example, fiber reinforced plastics (FRP: Fiber Reinforced Plastics). With this configuration, the liner plate 91 can be made lighter. Therefore, even if the number of liner plates 91 connected in the vertical direction Z increases, the load of the suspended liner plate 91 does not become relatively large, and the convenience of the user can be improved. In particular, the liner plate 91 can be easily retrieved from the ground, and not only can the cost associated with the liner plate 91 be reduced, but the impact on the environment can also be reduced. Even if rain gets into the liner plate 91, it is unlikely to rust, and it is unlikely to affect the workers, so the retrieved liner plate 91 can be reused in good condition. In addition, the liner plate 91 can be easily processed. Specifically, it is easy to make the outer peripheral surface of the liner plate 91 linear with respect to the vertical direction Z, and the inner peripheral surface of the liner plate 91 wavy with respect to the vertical direction Z. This makes it possible to prevent the liner plate 91 from getting caught on the inner wall surface of, for example, a shaft, and the liner plate 91 can be raised and lowered stably. Therefore, the convenience of the user can be improved. In this way, for example, a circular liner plate 91 may be constructed by directly connecting multiple members made of fiber-reinforced plastic in the circumferential direction Y.

The lifting device 10 can be used in shafts for deep foundation construction, shafts for jacking construction, and landslide prevention drainage wells. The lifting device 10 can also be used in underwater cofferdam construction. In this case, the liner plate 91 can be used as a retaining member, but is not limited to this. For example, it can also be used for underwater cofferdam construction by combining it with a packing.

- The expression "at least any" as used herein means one or more of the desired options. As an example, the expression "at least any" as used herein means only one option or both options if the number of options is two. As another example, the expression "at least any" as used herein means only one option or any combination of two or more options if the number of options is three or more.

10...lifting device, 11...connecting part, 12...lifting part, 13...driving part, 14...wire, 21...connecting frame, 23...first pulley, 31...base, 32...legs, 35...support part, 37...second pulley, 38...third pulley, 90...liner plate unit, 91...liner plate, 92...support member, 98...vertical shaft, 99...installation surface.

Claims (11)

A base that can be installed on an installation surface;
A plurality of legs extending vertically upward from the base;
a support portion supported by each of the plurality of legs;
a connecting portion that is supported in a suspended state by a wire from the support portion and that is connectable to a liner plate;
Equipped with
The connecting portion is suspended from the supporting portion by the wire, and is raised by winding up the wire in response to a driving force from a driving portion, and is lowered by unwinding the wire in response to the driving force from the driving portion.
lift device. The lifting device according to claim 1,
The connecting portion can be suspended from a plurality of points of the supporting portion using one of the wires.
lift device. The lifting device according to claim 1,
The base is annular,
The support portion is annular,
The outer diameter of the support portion is shorter than the outer diameter of the base.
lift device. The lifting device according to claim 1,
The base is annular,
The connecting portion has a connecting frame that is annular,
The outer diameter of the connecting frame is shorter than the inner diameter of the base.
lift device. The lifting device according to claim 1,
The space between the plurality of legs is a space in which a member constituting the liner plate can be inserted and removed from the base.
lift device. In the lifting device according to any one of claims 1 to 5,
The connecting portion includes a connecting frame having an annular shape and a first pulley around which the wire is wound,
The first pulley is accommodated above the connecting frame in the vertical direction and guides the wire along the vertical direction.
lift device. In the lifting device according to any one of claims 1 to 5,
The support portion includes a second pulley that guides the wire along a horizontal direction intersecting the vertical direction, and a third pulley that guides the wire along the vertical direction.
lift device. In the lifting device according to any one of claims 1 to 5,
The drive unit is provided,
The drive unit includes an electric winch.
lift device. A construction method using a lifting device including a base that can be installed on an installation surface, a plurality of legs that extend vertically upward from the base, a support portion supported by each of the plurality of legs, and a connecting portion that is supported in a suspended state by a wire from the support portion and can be connected to a liner plate,
connecting the connecting portion to an upper end of the liner plate;
lifting the connecting portion by winding up the wire in response to a driving force from a driving portion;
lowering the connecting portion by unwinding the wire in response to a driving force from the driving portion;
including,
A construction method using a lifting device. In a construction method using the lifting device according to claim 9,
removing the connecting portion from an upper end of the liner plate with the liner plate installed;
connecting a new liner plate to the upper end of the liner plate;
connecting the connecting portion to the upper end of the new liner plate;
lowering the connecting portion by unwinding the wire in response to a driving force from the driving portion;
repeat,
A construction method using a lifting device. In a construction method using the lifting device according to claim 9,
When a plurality of the liner plates are connected in the vertical direction,
connecting the connecting portion to an upper end portion of the liner plate that is located at the top of the plurality of liner plates in the vertical direction;
lifting the connecting portion by winding up the wire in response to a driving force from the driving portion;
removing the connecting portion from an upper end portion of the liner plate that is located at the top in the vertical direction while the liner plate is installed;
removing and recovering the liner plate located at the top in the vertical direction;
repeat,
A construction method using a lifting device.

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