Movable step device

Abstract

To provide a movable step device for performing work at a position near a work object.SOLUTION: The movable step device 51 includes a support 60A disposed at an end of the work platform and a rectangular footboard 60A that slides in the first direction SD1 with respect to the support 80A. The side part 6162 of the support 60A guides the footrest part 80A to the SD1 in the first direction.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present disclosure relates to a sliding movable step device used as scaffolding at construction sites and the like. [Background technology]

[0002] Conventionally, a structure in which two structures with different stiffness are connected by a vibration control device has been known as a structure for reducing seismic forces acting on buildings and other structures (see, for example, Non-Patent Document 1 and Patent Document 1). The structure (dual frame system) described in Non-Patent Document 1 and Patent Document 1 has a rigid first building constructed in the center of the building and a flexible second building made of columns and beams around the periphery of the first building. These first and second buildings are then connected by a vibration control device.

[0003] When the central first building is constructed of reinforced concrete, it is considered to install a lifting scaffold inside the first building (see, for example, Patent Document 2). The lifting scaffold described in Patent Document 2 has a guide mast, a drive unit that is attached to and detached from the guide mast and moves up and down while attached, and a work deck that is installed in a substantially horizontal position on the drive unit. This lifting scaffold is installed near the object to be constructed and is raised and lowered as needed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-211506 [Patent Document 2] Japanese Patent Publication No. 2020-33713 [Non-patent literature]

[0005] [Non-Patent Document 1] “Obayashi Solutions / Technology Dual Frame System (DFS)”, [online], [Retrieved May 31, 2024], Internet<URL:https: / / www.obayashi.co.jp / solution_technology / detail / tech032.html> Summary of the Invention [Problem to be solved by the invention]

[0006] However, if the gap between the first building and the scaffolding is made small, there is a possibility that the two will come into contact when the scaffolding is raised or lowered. Conversely, if the space between the first building and the scaffolding is made large in order to allow the scaffolding to rise and lower smoothly, it will become difficult to work on the first building. [Means for solving the problem]

[0007] A movable step device that solves the above problem comprises a support body that is placed at the end of a work floor, a rectangular footplate portion that slides in a first direction relative to the support body, and a guide member that guides the footplate portion in the first direction, wherein the support body has a housing that can accommodate the footplate portion, and the guide member is a side portion of the housing. [Effects of the Invention]

[0008] According to the present disclosure, work can be performed at a position close to the work object. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a longitudinal cross-sectional view illustrating a stage structure on which a movable step device according to an embodiment is provided and a structure constructed by this stage structure. [Figure 2] FIG. 2 is a vertical cross-sectional view of a stage structure according to the embodiment. [Figure 3] FIG. 2 is a plan view of a stage structure according to the embodiment. [Figure 4] FIG. 2 is a perspective view of the stage structure according to the embodiment, seen obliquely from above. [Figure 5] FIG. 2 is a perspective view of the stage structure according to the embodiment, seen obliquely from below. [Figure 6] FIG. 2 is a perspective view of a first movable step device in the embodiment. [Figure 7] FIG. 2 is a front view of a first movable step device according to the embodiment. [Figure 8] FIG. 2 is a perspective view of a support of a first movable step device in an embodiment. [Figure 9] FIG. 2 is a perspective view of a step portion of the first movable step device in the embodiment. [Figure 10] 3 is a cross-sectional view of a footboard portion of a first movable step device in the embodiment. FIG. [Figure 11] FIG. 10 is a side cross-sectional view of a third movable step device in the embodiment. [Figure 12] FIG. 10 is a perspective view of a support of the third movable step device in the embodiment. [Figure 13] FIG. 10 is a perspective view of a fourth movable step device in the embodiment, viewed obliquely from above. [Figure 14] 1 is a perspective view showing a state in which the footboard portion of the first movable step device in the embodiment is slid. FIG. [Figure 15] 10 is a side cross-sectional view showing a state in which the footboard portion of the first movable step device in the embodiment is slid. FIG. [Figure 16] 10 is a perspective view seen obliquely from above, illustrating the use state in which each movable step device is pulled out in the stage structure in the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the movable step device will be described below with reference to Figures 1 to 16. Here, the case where the movable step device is installed on a stage structure used to construct a multi-story earthquake-resistant wall located at the center of a DFS (dual frame system) will be described.

[0011] Figure 1 is a cross-sectional perspective view of a key part of a DFS building 10 in the middle of construction. This building 10 has a rigid multi-story earthquake-resistant wall 15 constructed in the center and a flexible structure 11 arranged around the periphery of this multi-story earthquake-resistant wall 15, connected by vibration control devices (not shown). The flexible structure 11 is, for example, a house made of reinforced concrete. The multi-story earthquake-resistant wall 15 is, for example, a parking lot made of reinforced concrete.

[0012] Figures 2 and 3 are a front view and a plan view of the main parts of the stage structure 20 in Figure 1. Figure 3 does not show wall connectors 25, support members 41, and brackets 42, which will be described later. Figures 4 and 5 are perspective views of the stage structure 20 as seen obliquely from above and below, respectively.

[0013] As shown in Figures 1 to 3, the stage structure 20 includes masts M1 and M2 and a stage section 30. The interior of the multi-story earthquake-resistant wall 15 has a space whose horizontal cross section is roughly rectangular. A plurality of (four) masts M1 and M2 are erected in this space at a distance from each other.

[0014] 3 to 5, four masts M1, M2 are provided at a distance inside the multistory earthquake-resistant wall 15. Two masts M1, M2 (pairs) are arranged on each of the opposing wall surfaces of the multistory earthquake-resistant wall 15.

[0015] As shown in Figures 2 and 4, each mast M1, M2 has three vertical members 21, a plurality of horizontal members 22 that connect the vertical members 21 horizontally, and a plurality of diagonal members 23 that connect the intersections of the vertical members 21 and the horizontal members 22 diagonally.

[0016] Furthermore, one rack (not shown) of a rack-and-pinion mechanism is fixed to each of the masts M1 and M2. Each rack extends vertically and has teeth formed in the vertical direction. The upper end of each rack is fixed to the upper end of the corresponding mast M1 and M2, and the main body of each rack is also fixed to the corresponding mast M1 and M2 as appropriate.

[0017] 1 and 2, each mast M1, M2 is provided with a wall joint 25 that connects it to the multi-story earthquake-resistant wall 15. The wall joint 25 connects the inside of the completed portion of the multi-story earthquake-resistant wall 15 to each mast M1, M2.

[0018] (Configuration of stage section 30) As shown in FIG. 1, a stage section 30 that is supported by the masts M1 and M2 and moves up and down is disposed inside the multi-story earthquake-resistant wall 15 with a space therebetween. The stage section 30 is provided with a pair (two) of lifting platforms 31 arranged opposite each other.

[0019] As shown in Figures 2 to 5, the lifting scaffold 31 is a lift climber (lifting scaffold) that ascends and descends along a pair of masts M1 (M2). Each lifting scaffold 31 includes a deck section 31a made of flat plates, a truss structure section 31b that supports the deck section 31a, and lifting devices 31c. Each lifting scaffold 31 is provided with a number (two) of lifting devices 31c corresponding to the masts M1 (M2) that it is connected to. Each lifting device 31c includes a motor that serves as a driving source for ascending and descending, and a pinion engaged with the output shaft of the motor. This pinion is threadedly engaged with a rack of a rack-and-pinion mechanism fixed to the masts M1 and M2. In this embodiment, a lift climber (lifting scaffold) "PW-35 Twin Mast" manufactured by Takamiya Corporation is used.

[0020] Furthermore, the stage section 30 has a main beam 33 that spans the deck sections 31 a of the pair of opposing lifting platforms 31 , and minor beams 34 and 35 that are arranged on the main beam 33 . The girder 33 is made of H-shaped steel and extends in a direction perpendicular to the extending direction of the deck portion 31a. The girder 33 is disposed at a position sandwiching the opposing masts M1 and M2.

[0021] The minor beams 34, 35 are made of H-shaped steel that is smaller than the main beam 33 and are arranged perpendicular to the main beam 33. The minor beam 34 is arranged in the center of the stage portion 30 and is made of a member that is thicker and larger than the minor beam 35.

[0022] The stage section 30 has scaffolding boards 36 fixed onto the joists 34, 35. The scaffolding boards 36 are laid out over an area excluding an insertion area 36a through which the masts M1, M2 are inserted, an opening 37, and the areas where the movable step devices 51, 52, 54, 55, and 56 (described later) are arranged. The lower end of a mast enclosing member 38 is fixed inside the insertion area 36a. The mast enclosing member 38 is a plate member having a U-shaped horizontal cross section and enclosing the masts M1, M2. Furthermore, a closing plate 39 is fixed to the insertion area 36a on the outer side of the masts M1, M2 (on the side of the multistory earthquake-resistant wall 15).

[0023] The opening 37 is located between the two masts M1. A cover member (not shown) capable of closing the opening 37 is provided on the upper surface of the opening 37.

[0024] 2, 4, and 5, in the stage section 30, support members 41 extending downward are provided at both ends of each main beam 33. The support members 41 are fixed to the upper surfaces of brackets 42.

[0025] The bracket 42 is detachably fixed to the multi-story shear wall 15 using anchors (not shown) at a position a predetermined distance lower than the stage portion 30. In this embodiment, the bracket 42 is provided in the multi-story shear wall 15 at a position (height) lower than the area of ​​the last story formed, and at a position that is easy to attach. The bracket 42 supports the weight of the stage portion 30 on the multi-story shear wall 15.

[0026] <Movable step device> 3, a plurality of movable step devices 51, 52, 54, 55, and 56 are arranged on the periphery of the stage unit 30. The movable step devices 51, 52, 54, 55, and 56 correspond to the first, second, third, fourth, and fifth movable step devices, respectively.

[0027] The multiple movable step devices 51 and 52 are arranged in a direction parallel to the extension direction of the main girder 33 and perpendicular to the extension direction of the sub-beams 34 and 35. The multiple movable step devices 54 are arranged in a direction perpendicular to the extension direction of the main girder 33 and parallel to the extension direction of the sub-beams 34 and 35. The movable step devices 55 and 56 are arranged at the corners of the stage section 30. In this embodiment, the movable step devices 55 and 56 are attached side by side with the movable step device 54. The movable step devices 55 and 56 are arranged at diagonal corners. The movable step devices 55 and 56 have bilaterally symmetrical shapes.

[0028] (Configuration of the movable step device 51) First, the configuration of the movable step device 51 will be described with reference to FIGS. 6 and 7 are respectively a perspective view and a front view (seen from the front) of the entire movable step device 51. Figures 8 and 9 are respectively a perspective view of the support body 60A and a perspective view of the footboard portion 80A that constitute the movable step device 51. Figure 10 is a perspective view of a cross section of the footboard portion 80A.

[0029] As shown in Figures 6 and 7, the movable step device 51 has a support body 60A and a footboard portion 80A. The support body 60A is fixed to the small beam 35 of the stage portion 30. The footboard portion 80A is pulled out in a first direction SD1 from a state in which it is entirely housed in the housing of the support body 60A, and is brought into a usable state in which it protrudes from the support body 60A. The movable step device 51 of this embodiment has a configuration that is symmetrical with respect to the center plane C1.

[0030] 8, support body 60A includes a housing having a substantially rectangular parallelepiped shape. This housing has spaced-apart side portions 61 and 62, connecting portions 65a and 65b spaced apart on the upper surface, and connecting portions 66, 67, 68, and 69 spaced apart on the lower surface.

[0031] The side portions 61, 62 function as guide members and are made of channel steel (first channel steel) with a U-shaped cross section, and are arranged so that their openings face the center plane C1 (inward) of the movable step device 51. Two spaced-apart rotating members 63 are rotatably mounted on the inside of the vertical portion of each side portion 61, 62. Furthermore, a screw hole is formed on the top surface of the tip portion (end portion on the first direction SD1 side) of the side portions 61, 62, and a fixing bolt 64 is provided to screw into this screw hole. The fixing bolt 64 functions as a locking device that fixes the step plate portion 80A in the pulled-out state (the position where the step plate portion 80A is pulled out).

[0032] The connecting portions 65a and 65b have a rectangular shape, and both ends of the connecting portions 65a and 65b are connected to the upper surfaces of the side surface portions 61 and 62, respectively. The connecting portions 66, 67, 68, and 69 are L-shaped. Both ends of the connecting portions 66 to 69 are connected to the lower surfaces of the side surface portions 61 and 62, respectively.

[0033] 7 and 8, each of the connecting portions 66 to 69 is provided with three mounting members 70. The mounting members 70 are arranged side by side in the extension direction of the connecting portions 66 to 69. The mounting members 70 are provided at positions corresponding to the small beams 35 on which the movable step devices 51 are arranged.

[0034] Each mounting member 70 includes a U-shaped locking rod 71, a retaining plate 72, a first nut 73, and a second nut 74. The locking rod 71 is sized to accommodate the sub-beam 35 inside. The locking rod 71 is fixed to each connecting portion 66-69 by inserting it, with the opening facing downwards, through a hole formed in each connecting portion 66-69. The locking rod 71 is U-shaped, with a pair of parallel legs at both ends. A thread is formed at the tip of each leg of the locking rod 71. The retaining plate 72 has an elongated hole 72h. This elongated hole 72h is sized to allow the pair of parallel legs of the locking rod 71 to be inserted therein. The first nut 73 and the second nut 74 are screwed onto the threads of the locking rod 71. By tightening the first nut 73 and the second nut 74 onto the locking rod 71, the retaining plate 72 is pressed against the minor beam 35, thereby fixing the support body 60A to the minor beam 35.

[0035] As shown in FIG. 9, the footboard 80A includes a main body 81, a pair (two) of side surfaces 83, 84, a front surface 85, a rear surface 86, and a pair (two) of wheels 87, 88. As shown in Figure 10, the main body 81 of this embodiment is composed of two lip channel steels 81a, 81b and one L-shaped angle 81c. The lip channel steels 81a, 81b are joined side by side with their bottoms open. The horizontal end of the L-shaped angle 81c is joined to the lip channel steel 81b while being placed on the upper surface of the lip channel steel 81b. The vertical portion of the L-shaped angle 81c has a length equal to the height of the lip channel steels 81a, 81b.

[0036] As shown in FIG. 9, side sections 83, 84 are fixed to both side surfaces of the main body 81 of the footboard 80A. Each side section 83, 84 has a symmetrical shape. The side section 83 (84) is formed by joining two channel steels 83a, 83b (84a, 84b) with their openings on opposite sides. The channel steels 83a, 84a located inside the side sections 83, 84 are joined to the upper surface of the side end of the main body 81. The rotating member 63 of the support body 60A abuts against the lower surface of the upper surface of the channel steels (second channel steels) 83b, 84b located outside the side sections 83, 84.

[0037] A front surface portion 85 is fixed to the front surface of the lip channel steel 81a located on the front side (the sliding first direction SD1 side) of the main body portion 81. The front surface portion 85 is made of a square steel pipe having a rectangular frame-shaped cross section. Therefore, the front surface portion 85 has a hollow portion inside.

[0038] Additionally, a rear surface portion 86 is fixed to the rear surface of the L-shaped angle 81c located on the rear side (opposite the first sliding direction SD1). Similar to the front surface portion 85, the rear surface portion 86 is made of a square steel pipe having a rectangular cross section.

[0039] Wheels 87, 88 are rotatably attached via mounting members to both ends of the rear surface portion 86. The wheels 87, 88 are positioned at heights that allow them to travel on the upper surfaces of the lower surfaces of the side surface portions 61, 62 of the support body 60A.

[0040] (Configuration of the movable step device 52) The movable step device 52 shown in Figures 3 to 5 is lined up with multiple movable step devices 51 in the center of the stage section 30. This movable step device 52 has a configuration in which its longitudinal length is shorter than that of the movable step device 51. This movable step device 52 is attached to two small beams 35. Therefore, two mounting members 70 are attached to each of the connecting portions 66 to 69 of the support body 60A of the movable step device 52. As the other configurations of the movable step device 52 are the same as those of the movable step device 51, detailed description thereof will be omitted.

[0041] (Configuration of the movable step device 54) Next, the configuration of the movable step device 54 will be described with reference to FIGS. 11 is a side cross-sectional view of the movable step device 54, and FIG. 12 is a perspective view of the support 60B of the movable step device 54. As shown in FIG.

[0042] 3, the plurality of movable step devices 54 are arranged in a direction perpendicular to the movable step device 51. Therefore, the longitudinal direction of the movable step devices 54 coincides with the extension direction of the small beam 35.

[0043] 11 and 12, the movable step device 54 has a support body 60B and a rectangular step portion 80A. The step portion 80A of the movable step device 54 is the same as the step portion 80A of the movable step device 51.

[0044] The support body 60B of the movable step device 54 differs from the support body 60A of the movable step device 51 only in the positions of the connecting portions 66 to 69 and the arrangement of the mounting member 70. Specifically, support body 60B, like support body 60A, has a housing having a substantially rectangular parallelepiped shape. This housing has side portions 61 and 62 spaced apart, connecting portions 65a and 65b spaced apart on the upper surface, and connecting portions 76, 77, 78, and 79 spaced apart on the lower surface. Connecting portions 76, 77, 78, and 79 are L-shaped, and both ends of connecting portions 76 to 79 are connected to the lower surfaces of side portions 61 and 62, respectively.

[0045] In this embodiment, the connecting portions 76-79 are connected to the undersides of the side portions 61, 62 at positions where the small beam 35 will be disposed according to the installation position of the movable step device 54 on the stage portion 30. Specifically, the connecting portions 76-79 are provided so that the distance between the connecting portions 76 and 77 and the distance between the connecting portions 78 and 79 correspond to the distance between both ends of the locking rod 71 of the mounting member 70. Furthermore, the small beam 35 is disposed so as to be housed inside the locking rod 71 of the mounting member 70 attached to the connecting portions 76-79.

[0046] (Configuration of movable step devices 55, 56) Next, the configuration of the movable step devices 55, 56 will be described with reference to Figure 13. The movable step devices 55, 56 differ only in the protruding direction of the mounting member 90, which will be described later, so only the movable step device 55 will be described and a detailed description of the movable step device 56 will be omitted.

[0047] As shown in FIG. 13, the longitudinal direction of the movable step device 55 is the same as the direction in which the small beam 35 extends, similar to the movable step device 54 . The movable step device 55 has a support body 60C and a footboard portion 80B.

[0048] Support body 60C of movable step device 55 has a shorter length in the longitudinal direction (direction perpendicular to first direction SD1) than support body 60B of movable step device 54. Therefore, support body 60C is connected to side surface portions 61 and 62 by connecting portions 65as, 65bs, 76s, 77s, etc., which are shorter than connecting portions 65a, 65b, 76, 77, 78, 79 of support body 60B. Similarly to connecting portions 76 and 77, two mounting members 70 are attached so as to straddle connecting portions 76s and 77s of support body 60C. Furthermore, two mounting members 70 are attached so as to straddle adjacent connecting portions (not shown) that correspond to connecting portions 78 and 79 of support body 60B.

[0049] The footboard portion 80B of the movable step device 55 has a shorter longitudinal length than the footboard portion 80A. Specifically, like the footboard portion 80A, the footboard portion 80B includes a main body portion 81s, a pair (two) of side surfaces 83, 84, a front surface portion 85s, a rear surface portion 86s, and a pair (two) of wheels 87, 88.

[0050] The main body 81s of the footboard 80B is identical in configuration to the main body 81 of the footboard 80A except that its length in the longitudinal direction is shorter than that of the main body 81 of the footboard 80A. The front surface portion 85s has a rectangular frame-like cross section with a hollow portion formed inside, and is made of a square steel pipe that is shorter than the front surface portion 85 of the foot plate portion 80A. The main body portion 91 of the mounting member 90 is housed inside the front surface portion 85s of the foot plate portion 80B.

[0051] The mounting member 90 comprises a main body portion 91 on which a scaffolding board can be placed, and a hook portion 92. The main body 91 has a rectangular plate shape with approximately the same length as the front face 85s. The main body 91 is accommodated inside the front face 85s and can be pulled out in a second direction SD2 that is perpendicular to the first direction SD1.

[0052] The hooking portion 92 of the step portion 80B is provided at the end of the main body portion 91 on the second direction SD2 side. This hooking portion 92 has an L-shape and protrudes upward from the top surface of the main body portion 91. An upper end 92a of the hooking portion 92 protrudes on the side opposite to the second direction SD2. Due to this shape, the hooking portion 92 engages with the end and top surface of a scaffolding board placed on the main body portion 91. This prevents the scaffolding board placed on the main body portion 91 from falling in the second direction SD2.

[0053] (Movement of the movable step device) Next, the operation of each of the movable step devices 51 to 56 will be described. As shown in Figures 1 and 2, as the multi-story earthquake-resistant wall 15 is constructed, the masts M1 and M2 of the stage structure 20 are added to increase the height, and the stage portion 30 is gradually raised along these masts M1 and M2. 3, the tread portions 80A and 80B of each of the movable step devices 51 to 56 are housed within the supports 60A, 60B, and 60C, respectively. This creates a space between the stage portion 30 and the multistory earthquake-resistant wall 15 to be constructed, allowing the stage portion 30 to move up and down smoothly.

[0054] On the other hand, when constructing a new story of multi-story shear wall 15, the stage unit 30 is stopped at a predetermined height. Then, the construction work for the multi-story shear wall 15 is carried out. This construction work includes arranging the reinforcing bars to be embedded in the new story of multi-story shear wall 15 and arranging concrete forms. Before this construction work, the tread units 80A, 80B of each of the movable step devices 51-56 are pulled out.

[0055] Here, the details of the operation of pulling out the step plate portion 80A in the movable step device 51 shown in FIGS. 14 and 15 will be described. The worker lifts the footplate 80A and pulls it out in the first direction SD1. In this case, the wheels 87, 88 of the footplate 80A run on the upper surfaces of the lower surfaces of the side surface portions 61, 62. Furthermore, the rotating member 63, which abuts against the lower surfaces of the upper surfaces of the channel steels 83b, 84b of the side surface portions 83, 84, pushes out the footplate 80A. Then, the front surface 85 (tip) of the footplate 80A abuts against the multistory earthquake-resistant wall 15. As a result, the footplate 80A closes the space between the stage portion 30 and the multistory earthquake-resistant wall 15.

[0056] Next, to maintain the state in which the foot plate portion 80A is pulled out in the first direction SD1, the fixing bolt 64 is pushed in. This causes the tip of the fixing bolt 64 to press the foot plate portion 80A downward, thereby fixing the pulled-out position (length) of the foot plate portion 80A.

[0057] In the same manner as the operation of the movable step device 51 described above, the step board portions 80A and 80B are also pulled out in the movable step devices 52 to 56. Furthermore, in the movable step device 55 (56) shown in FIG. 13, after the footboard portion 80B is pulled out, the placement member 90 is pulled out from the front surface portion 85s in the second direction SD2.

[0058] Then, as shown in FIG. 16, a scaffolding board 95 is placed over the movable step device 51 adjacent to the movable step devices 55, 56 and over the mounting members 90 of the movable step devices 55, 56. In this case, the end of the scaffolding board 95 is positioned above the mounting member 90 shown in FIG. 13 and below the upper end 92a of the hooking portion 92. As a result, gaps in two directions between the corners of the stage portion 30 and the multi-story earthquake-resistant wall 15 can be filled.

[0059] (Operation of the embodiment) Movable step devices 51-56 are arranged around the periphery of the stage section 30. Each of the movable step devices 51-56 has footboard sections 80A, 80B that move relative to the supports 60A-60C. By pulling out the footboard sections 80A, 80B, a scaffold is constructed in the space between the stage section 30 and the multistory earthquake-resistant wall 15, on which people can stand and work.

[0060] According to this embodiment, the following effects can be obtained. (1) In this embodiment, the movable step devices 51-56 arranged around the stage 30 have footboards 80A, 80B that move relatively to the supports 60A-60C. The footboards 80A, 80B are pulled out from the supports 60A-60C, and the tips of the footboards 80A, 80B are brought into contact with the multistory shear wall 15. This allows the footboards 80A, 80B to cover the space between the stage 30 and the multistory shear wall 15. Therefore, work can be done on the footboards 80A, 80B that are close to the multistory shear wall 15, allowing for efficient construction of the multistory shear wall 15.

[0061] (2) In this embodiment, the supports 60A to 60C of the movable step devices 51 to 56 have side surfaces 61, 62. Therefore, the step boards 80A, 80B are guided by the side surfaces 61, 62 and are pulled out in the first direction SD1.

[0062] (3) In this embodiment, the supports 60A to 60C of the movable step devices 51 to 56 are provided with fixing bolts 64. After the step boards 80A, 80B are pulled out, the fixing bolts 64 can be pushed in to fix the pulled-out positions (lengths) of the step boards 80A, 80B.

[0063] (4) In the movable step devices 51-56 of this embodiment, the wheels 87, 88 of the footboards 80A, 80B run on the upper surfaces of the lower surfaces of the side surfaces 61, 62 of the supports 60A-60C. Furthermore, the rotatable rotating members 63 provided inside the side surfaces 61, 62 of the supports 60A-60C abut against the lower surfaces of the upper surfaces of the channel steels 83b, 84b of the side surfaces 83, 84 of the footboards 80A, 80B. The rotation of the wheels 87, 88 and the rotating members 63 allows the footboards 80A, 80B to be smoothly pulled out in the first direction SD1.

[0064] (5) In this embodiment, the supports 60A-60C of the movable step devices 51-56 are provided with mounting members 70. These mounting members 70 are provided corresponding to the positions of the small beams 35 disposed below the movable step devices 51-56, and are fixed by tightening the small beams 35 with first nuts 73 and second nuts 74. Therefore, the movable step devices 51-56 can be firmly fixed to the stage section 30.

[0065] (6) In this embodiment, the movable step devices 55, 56 arranged at the corners of the stage section 30 include a mounting member 90 housed in the front section 85. After the movable step devices 55, 56 are pulled out in the first direction SD1, the mounting member 90 is pulled out in the second direction SD2. This allows the space at the corner of the stage section 30 to be blocked in two directions by the footboard section 80B and the scaffolding board 95 placed on the mounting member 90.

[0066] (7) In the movable step devices 55, 56 of this embodiment, a hook portion 92 is provided at the end of the mounting member 90. As a result, by engaging the scaffolding board 95 placed on the mounting member 90 with the hook portion 92, it is possible to prevent the scaffolding board 95 from falling in the second direction SD2.

[0067] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, the movable step devices 55, 56 arranged at the corners of the stage section 30 are arranged side by side with the movable step device 54 arranged in the extension direction of the minor beam 35. The movable step devices 55, 56 arranged at the corners of the stage section 30 may also be arranged side by side with the movable step devices 51 (52) arranged in a direction perpendicular to the extension direction of the minor beam 35. In this case, the mounting members 70 provided on the supports of the movable step devices 55, 56 are attached to each connecting portion connecting a pair of side portions, similar to the movable step device 51, in order to attach them to the minor beam 35.

[0068] In the above embodiment, the supports 60A, 60B of the movable step devices 51, 54 are provided with a corresponding number of mounting members 70 for attachment to three minor beams 35. The support of the movable step device 52 and the support 60C of the movable step devices 55, 56 are provided with a corresponding number of mounting members 70 for attachment to two minor beams 35. The configuration of the movable step devices is not limited to this, as long as it is a housing that can accommodate and withdraw the footboard sections 80A, 80B. For example, the longitudinal length of the support may be increased and attached to four or more minor beams, or the longitudinal length of the support may be decreased and attached to one minor beam.

[0069] In the above embodiment, the movable step devices 51-56 are attached to the beam 35 via the attachment member 70. The movable step devices 51-56 are not limited to being attached to the beam 35. For example, they may be attached to the girder 33 or the scaffolding board 36. Furthermore, the movable step devices may be attached across multiple members. For example, the rear portion of the movable step device may be placed on the scaffolding board 36, and the front portion of the movable step device may be attached to the beam 35.

[0070] In the above embodiment, the step boards 80A, 80B that are pulled out from the movable step devices 51-56 include a main body 81, 81s, a pair of side surfaces 83, 84, a front surface 85, 85s, a rear surface 86, 86s, and a pair (two) of wheels 87, 88. The configuration of the step boards 80A, 80B is not limited to this, and they may be any members that can be pulled out from the supports 60A-60C of the movable step devices 51-56 and on which work can be performed.

[0071] In the above embodiment, a configuration has been described in which the movable step devices 51-56 are arranged on the periphery of the stage structure 20 constructed inside the multi-story earthquake-resistant wall 15 in order to construct the multi-story earthquake-resistant wall 15 of the building 10. The installation of the movable step devices is not limited to the stage structure 20, and can be applied to cases where there is a space between the work platform and the work object and the step board section is pulled out to close the space. For example, the movable step device may be arranged on one side of a linear lifting device.

[0072] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (a) the side surface of the housing has a first channel steel having a U-shape that opens to the inside of the side surface, 3. The movable step device according to claim 2, wherein the wheels run in contact with the first channel steel. (b) The movable step device according to claim 4, wherein the mounting member includes a restricting portion that restricts movement of the mounting plate in the second direction. (c) The side surface of the footboard has a second channel steel having a U-shape that opens to the outside of the side surface, 2. The movable step device according to claim 1, wherein a rotating member that can abut against the second channel steel and can rotate is provided on a side portion of the housing. [Explanation of symbols]

[0073] M1, M2... Mast, SD1... First direction, SD2... Second direction, 10... Building, 11... Flexible structure, 15... Multi-story earthquake-resistant wall, 20... Stage structure, 21... Vertical member, 22... Horizontal member, 23... Diagonal member, 25... Wall connection, 30... Stage section, 31... Lifting scaffold, 31a... Deck section, 31b... Truss structure section, 31c... Lifting device, 33... Main girder, 34, 35... Sub-girder, 36, 95... Scaffolding board, 36a... Insertion area, 37... Opening, 38... Mast surrounding member, 39... Closure plate, 41... Support member, 42... Bracket, 51, 52, 54, 55, 56... Movable step device, 60A, 60B, 60C... Support, 61, 62... Guide section Side portion as material, 63...rotating member, 64...fixing bolt, 65a, 65b, 66, 67, 68, 69, 76, 76s, 77, 77s, 78, 78s, 79, 79s...connecting portion, 70...mounting member, 71...locking rod, 72...retaining plate, 72h...long hole, 73...first nut, 74...second nut, 80A, 80B...treadle portion, 81, 81s, 91...main body, 81a, 81b...lip channel steel, 81c...L-shaped angle, 83, 84...side portion, 3a, 83b, 84a, 84b...channel steel, 85, 85s...front portion, 86, 86s...rear portion, 87, 88...wheels, 90...supporting member, 92...hanging portion, 92a...upper end portion.

Claims

1. A support disposed at an end of the work platform; a rectangular footplate portion that slides in a first direction relative to the support; a guide member that guides the footboard portion in the first direction, The support body has a housing capable of accommodating the footboard portion, A movable step device characterized in that the guide member is a side portion of the housing.

2. 2. The movable step device according to claim 1, wherein a wheel is provided on the footboard portion on the opposite side of the first direction.

3. 3. A movable step device according to claim 1, wherein the support member comprises a mounting member that is hooked onto and fixed to a beam disposed under the work floor.

4. The tip end of the footboard portion in the first direction is formed by a member having a hollow portion therein, A movable step device as described in claim 1 or 2, characterized in that the hollow portion accommodates a mounting member that can be pulled out in a second direction perpendicular to the first direction and on which a scaffolding board can be placed.

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