Method for manufacturing scaffolding under elevated structures and jig for installing flooring materials

Abstract

To provide an erection method for installing an under-viaduct scaffold having good workability, and a cross beam delivery device used for the erecting method.SOLUTION: An erection method for an under-viaduct scaffold comprises the steps of: attaching a floor material installation jig to a new cross beam; attaching the front end of a new floor material to the floor material installation jig; sending both the new cross beam and the new floor material in the extension direction; and lowering the floor material installation jig so that the front end of the newly installed floor material rests on the floor material installation position of the newly installed cross beam by tilting with the existing cross beam as the fulcrum, when the floor material installation jig supports the front end of the new floor material so as to allow its lowering, and the new floor material is fed out to slide on the existing cross beam, and when the position of the center of gravity moves to the extension side beyond the existing cross beam.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a scaffold to be attached under a bridge and elevated structures such as railways and highways, and a floor material installation jig.

Background Art

[0002] For the work of inspecting and repairing bridges and elevated structures such as railways and highways (hereinafter, these are collectively referred to as "elevated structures"), a temporary temporary scaffold may be attached under the elevated structure.

[0003] In addition, the under-elevated scaffold can cover the aged elevated structure, prevent concrete pieces from falling from the elevated structure and hitting vehicles or pedestrians passing below, and there is also an increasing demand to install it as a permanent scaffold so that inspections and repairs can be carried out at any time.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Whether it is a temporary scaffold or a permanent scaffold, the under-elevated scaffold is installed to cover the area under the elevated structure while leaving a space for vehicles and the like to pass below so as not to obstruct traffic. In the past, an aerial work platform has sometimes been used, but there were inconveniences such as the need to temporarily block traffic. Furthermore, in places where an aerial work platform cannot enter, a scaffold has been assembled from pontoons floating on the ground surface or water surface to install an under-elevated scaffold, and the workability has been poor. An object of the present invention is to provide a manufacturing method for installing an under-elevated scaffold with good workability and a cross beam feeding device used in the manufacturing method.

Means for Solving the Problems

[0005] In order to solve the above problems, the method for manufacturing an under-elevated scaffold according to claim 1 is as follows: A step of attaching a floor material installation jig to a newly installed cross beam; A step of attaching the front end of the newly installed floor material to the floor material installation jig; The process of extending both the new crossbeams and the new flooring materials in the direction of extension. The flooring installation jig supports the front end of the newly installed flooring so that it can be lowered. With a flooring installation jig Place the front edge of the new flooring material on the flooring material installation position on the new crossbeam. Down The process of lowering, Includes.

[0006] Furthermore, in order to solve the aforementioned problems, the floor material installation jig according to claim 2 comprises a main body, an arm, and a floor material mounting part. The main body has a crossbeam mounting part and is attached to the upper flange of the newly installed crossbeam. The arm is attached to the main body via an arm pivot axis. The floor material mounting part is attached to the arm via a floor material pivot axis and attaches the front end of the floor material. When the arm and floor material mounting part move downward, the front end of the newly installed floor material is installed on the lower flange of the newly installed crossbeam. [Effects of the Invention]

[0007] This invention makes it possible to easily install scaffolding under elevated structures, thereby improving work efficiency. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1(A) is a schematic diagram of a scaffolding according to an embodiment of the present invention, where Figure 1(A) is a cross-sectional view of the elevated structure and Figure 1(B) is a side view of the elevated structure. [Figure 2] Figure 2(a) shows the floor material installation jig A attached to the newly installed crossbeam; Figure 2(b) is a plan view of the jig attached to the newly installed crossbeam 75a; Figure 2(b) is a cross-sectional view of Figure 2(a) (b)-(b); and Figure 2(c) is an enlarged view of the front side of Figure 2(b). [Figure 3] Perspective view of Figure 2(a). [Figure 4] A cross-sectional view showing the main body and arm separated. [Figure 5] This diagram shows the newly installed crossbeam and new flooring material being extended in the direction of installation. Figure 5(a) is a plan view, Figure 5(b) is a cross-sectional view of Figure 5(a) (b)-(b), and Figure 5(c) is an enlarged view of the front side of Figure 5(b). [Figure 6] This diagram shows the placement of newly installed flooring material relative to newly installed crossbeams. Figure 6(a) is a plan view, Figure 6(b) is a cross-sectional view of Figure 6(a) (b)-(b), and Figure 6(c) is an enlarged view of the front side of Figure 6(b). [Figure 7] Perspective view of Figure 6(a). [Figure 8] This is a diagram of the crossbeam delivery device, with Figure 8(a) being a side view, Figure 8(b) being an oblique view, and Figure 8(c) being a front view. [Figure 9] Figure 8 shows a process diagram for manufacturing scaffolding using the crossbeam delivery device. Figure 8(A) shows the process of manufacturing scaffolding by pushing the crossbeam delivery frame in the extension direction, and Figure 8(B) shows the process of manufacturing scaffolding by pushing the new floor material in the extension direction. [Figure 10] This is a side view corresponding to the process diagram of the scaffolding manufacturing method shown in Figure 9. [Figure 11] A process diagram of a method for manufacturing scaffolding using a modified crossbeam delivery device. [Modes for carrying out the invention]

[0009] Hereinafter, with reference to the drawings, a method for manufacturing scaffolding under an elevated structure and a jig for installing flooring materials according to an embodiment of the present invention will be described. In the following explanation, the same symbols in different figures indicate parts with the same function, and redundant explanations in each figure will be omitted where appropriate.

[0010] Figure 1 shows a schematic diagram of scaffolding 7, where Figure 1(A) is a cross-sectional view of the elevated structure and Figure 1(B) is a side view of the elevated structure. Below the road surface 52, structural members such as plate girders (elevated main members) 51 are provided to support the road surface 52. The first scaffolding 7 is constructed using conventional techniques, by assembling ground scaffolding (not shown) from the ground and installing it under the elevated structure 5. The scaffolding 7 consists of crossbeams (H-shaped steel in the illustration) 75, support members 77, and flooring 74, and louvers 76 are provided as needed. The crossbeams 75 are installed at intervals in the direction of extension. The cross beam 75 is fixed to a strong structural material such as a plate girder (elevated main member) 51 or a box girder (not shown) via a support material 77 to support the scaffold 7. The floor is attached between adjacent cross beams 75. The floor is composed of a plurality of floor materials 74 as described later.

[0011] Here, as shown in FIGS. 9 and 10, the extension process of the scaffold 7 is roughly divided into the steps of attaching a floor material installation jig A (to be described later) to the cross beam 75 (newly installed cross beam 75a) and attaching the floor material installation jig A to the floor material 74 (newly installed floor material 74a), attaching an engagement hook B (to be described later) for engaging with the cross beam 75 (existing cross beam 74b) of the installed scaffold 71 to the newly installed floor material 74a, installing the newly installed cross beam 75a and the newly installed floor material 74a in the extension direction, attaching the installed newly installed cross beam 75a to the plate girder (elevated main member) 51 using the support material 77, and fixing the newly installed floor material 74a to the existing cross beam 74b of the installed scaffold 71 and the newly extended cross beam 75a. By repeating this extension process of the scaffold 7, the scaffold 7 is extended one after another. During this process, a step of installing a louver 76 for taking in external light and preventing rain and wind from blowing in may be included. Here, the newly installed cross beam 75a is a cross beam newly extended with respect to the existing cross beam 74b of the installed scaffold 71, and becomes the existing cross beam 74b after the installation of the newly installed floor material 74a. The newly installed floor material 74a becomes the existing floor material 74.

[0012] The direction with the direction of extending the scaffold 7 from the installed scaffold 71 as the axis is hereinafter referred to as the "front - rear direction", the extension side is referred to as "front", and the "installed scaffold 71" side is referred to as "rear". Also, the direction perpendicular to the horizontal direction of extending the scaffold 7, that is, the width direction of the elevated structure is hereinafter referred to as the "left - right direction".

[0013] [Structure of the floor] In this embodiment, the floor is configured by attaching a plurality of floor materials 74 so as to span between cross beams 75 arranged in the extension direction. In addition, a back panel (not shown) is provided as necessary. In the case of temporary scaffolding 7, which is to be removed in a short period of time, flooring material 74 may not be used to improve the efficiency of removal work. Therefore, the back panel can also be used as flooring. Furthermore, in areas where people cannot enter under the elevated structure, there is no need to consider the appearance, so the floor may be constructed using only the flooring material 74 without using the back panel.

[0014] (Invention 1) [Structure of flooring installation jig] Figures 2 and 3 show the floor material installation jig A attached to the newly installed crossbeam 75a. Figure 2(a) is a plan view of the jig attached to the new crossbeam 75a, Figure 2(b) is a cross-sectional view of Figure 2(a) (b)-(b), and Figure 2(c) is an enlarged view of the front side of Figure 2(b). Hereafter, the crossbeam 75 of the already installed scaffolding 71 will be referred to as the existing crossbeam 74b, and the extended crossbeam 75 will be referred to as the new crossbeam 75a.

[0015] The flooring installation jig A comprises a main body a and an arm b. The main body a is attached to the newly installed crossbeam 75a, and the front of the newly installed flooring material 74a is attached to the arm b, thereby integrating the newly installed crossbeam 75a and the newly installed flooring material 74a via the front flooring installation jig A. The newly installed crossbeam 75a and new flooring material 74a, which are integrated by the flooring material installation jig A, are fed out by the crossbeam feeding device 1 (described later) and move in the extension direction. As shown in Figures 5 and 6, the arm portion b rotates downward at a predetermined position, so that the front end portion of the new flooring material 74a is placed on the rear upper surface of the lower flange portion 750 of the new crossbeam 75a.

[0016] (Main body) The main body part a has a crossbeam mounting part a1 that is attached to the newly installed crossbeam 75a. The crossbeam mounting portion a1 is placed on the upper surface of the upper flange portion 751 of the newly installed crossbeam 75a, and includes rotational engaging portions a11 provided on both the left and right ends of the main body portion a, and a fixed engaging portion a12 provided on the rear side of the main body portion a. The rotating engagement portion a11 is roughly hook-shaped in side view, and two of them are attached to the left and right sides of the crossbeam mounting portion a1. They are pivotally supported so as to be rotatable around the left and right axes, and engage with and disengage from the front end of the upper flange portion 751 of the newly installed crossbeam 75a by rotation.

[0017] By tightening the bolt a13 on the upper surface of the rotating engagement part a11, the rotating engagement part a11 moves upward and clamps the front end of the upper flange portion 751 of the newly installed crossbeam 75a, thereby rendering it unable to rotate and maintaining its engagement state with the front end of the upper flange portion 751 of the newly installed crossbeam 75a. Furthermore, by loosening the bolt a13, the rotational engagement portion a11 descends and becomes rotatable, separating from the front end of the upper flange portion 751 of the newly installed crossbeam 75a, allowing for free engagement and disengagement with the front end of the upper flange portion 751. The fixed engaging portion a12 is roughly hook-shaped in side view and is provided on the rear side of the main body portion a. By sliding the main body portion a in the front-rear direction while the main body portion a is placed on the upper surface of the upper flange portion 751, it engages with and disengages from the rear end of the upper flange portion 751 of the newly installed crossbeam 75a.

[0018] With the crossbeam mounting portion a1 placed on the upper surface of the upper flange portion 751, the main body portion a can be firmly fixed to the upper surface of the upper flange portion 751 by engaging the rotational engaging portion a11 with the front end of the upper flange portion 751 and engaging the fixed engaging portion a12 with the rear end of the upper flange portion 751 and tightening the bolt a13. Furthermore, by loosening the bolt a13 and rotating the rotational engagement portion a11, the engagement of the rotational engagement portion a11 with the front end of the upper flange portion 751 can be released. Then, by sliding the main body portion a backward, the engagement of the fixed engagement portion a12 with the rear end of the upper flange portion 751 can be released, thereby allowing the main body portion a to be removed from the upper surface of the upper flange portion 751. Therefore, during the installation of the main body a, the main body a can be firmly fixed by engaging the detachable rotating engagement part a11 and the fixed engagement part a12, and by tightening the bolt a13 of the rotating engagement part a11, without having to drill holes or perform other processing on the newly installed crossbeam 75a. As a result, the installation of the main body a is easy and reliable, and can be done quickly. Furthermore, when removing the main body a, the engagement of the rotating engagement part a11 and the fixed engagement part a12 is released by loosening the bolt a13, allowing the main body a to be removed. This makes the removal of the main body a easy and quick process.

[0019] (Arm section) The arm portion b is rotatably connected to the main body portion a via the arm pivot axis a21, and is rotatable vertically about the arm pivot axis a21. The arm pivot axis a21 is pivotally supported by a pivot plate a14 which is erected on the main body a and has left and right axes.

[0020] A floor material attachment portion a22 is provided at the rear end of the arm portion b. The floor material mounting section a22 is used to attach the front end of the newly installed floor material 74a. It is connected to the arm section b via a floor material pivot shaft a23, which has left and right axes, and is rotatable vertically around the floor material pivot shaft a23. The floor material mounting section a22 is formed in a roughly plate-like shape that is long from left to right and placed on the upper surface of the new floor material 74a. When attaching the new floor material 74a to the floor material mounting section a22, the new floor material 74a can be firmly attached with a simple structure in which the floor material mounting section a22 is placed on the upper surface of the new floor material 74a and nuts a241 are tightened onto bolts a24 provided on the new floor material 74a, ensuring a secure attachment. To remove it, simply loosen and remove nut b241.

[0021] [Limitations] The arm portion b is located in two places, left and right, and is provided with shaft engagement portions a25 that are detachably and rotatably engaged with the arm rotation axis a21. The two are connected by engaging the shaft engagement portions a25 with the arm rotation axis a21. As shown in Figure 4, the shaft engagement portion a25 has a downward-opening engagement recess a250 and an opening / closing piece a251 that opens and closes the opening of the engagement recess a250. The opening and closing movement of the opening / closing piece a251 opens and closes the opening of the engagement recess a250, allowing the shaft engagement portion a25 to engage with and disengage from the arm pivot shaft a21 in the open state. Furthermore, when the engagement is active, the closing operation of the opening / closing piece a251 closes the opening of the engagement recess a250, thereby maintaining the engagement state of the axial engagement portion a25 with respect to the arm pivot axis a21. The opening / closing piece a251 is pivotally supported on left and right axes so as to be able to rotate in the vertical direction, and is always in the closed position due to the biasing force of a spring (not shown), and the closed state is maintained by a release lever a252 that locks the opening / closing piece a251 in the closed position. The lock of the release lever a252 does not affect the counterclockwise rotation of the opening / closing piece a251 when viewed from the side, and does not hinder the rotation of the opening / closing piece a252, while locking only the clockwise rotation of the opening / closing piece a251 when viewed from the side. Furthermore, the release lever a252 is pivotally supported on left and right axes and is always held in the locked position by the biasing force of a spring (not shown), and the lock on the opening / closing piece a251 is released by rotating it in one direction. Furthermore, the release lever a252 is designed to automatically lock the opening / closing piece a251 when it rotates from the closed position to a predetermined position in a counterclockwise direction when viewed from the side. When attaching the arm portion b, the engaging recess a250 of the shaft engaging portion a250 is pushed onto the arm pivot shaft a21, causing the opening / closing piece a251 to come into contact with the arm pivot shaft a21 and rotate to a predetermined position in a counterclockwise direction when viewed from the side due to the pushing force. When the opening / closing piece a251 is rotated to a predetermined position, the arm pivot shaft a21 enters the engagement recess a250. When the arm pivot shaft a21 enters the engagement recess a250, the opening / closing piece a251 rotates downward in a clockwise direction when viewed from the side due to the biasing force of the spring, and is locked in the closed position by the release lever a252. Furthermore, as shown in Figure 6, when removing the arm portion b while the newly installed flooring material 74a is placed on the flooring material installation position p1 of the newly installed crossbeam 75a (described later), the lock on the opening / closing piece a251 is released by rotating the release lever a252. In that state, if the arm portion b is pulled backward, the opening / closing piece a251 comes into contact with the arm pivot axis a21 and rotates clockwise in a side view, causing the engaging recess a250 to disengage from the arm pivot axis a21 and the arm portion b can be removed from the main body portion a. In other words, since the main body part a, which is fixed to the newly installed crossbeam 75a, and the arm part b, which is fixed to the newly installed flooring material 74a, can be separated, the installation of the flooring material installation jig A can be completed simply by attaching both parts, thus improving work efficiency. Note that the shaft engagement portion a25 is not limited to the example configuration; any configuration that allows the arm portion b to be attached to and detached from the main body portion a is acceptable.

[0022] [Structure of the engaging hook] Figure 4 shows the engagement hook B attached to the rear end of the flooring material 74, Figure 5(a) is a plan view of the newly installed flooring material 74a installed, and Figure 5(b) is a cross-sectional view of Figure 5(a)-(b). The engaging hook B supports the new flooring material 74a on the existing crossbeam 74b by engaging with the existing crossbeam 74b when the new flooring material 74a and the new crossbeam 75a move to a predetermined position. The engaging hook B comprises a hook portion b1 and a roughly plate-shaped floor material mounting portion b2 that is elongated to the left and right and placed on the upper surface of the newly installed floor material 74a. The hook portion b1 is formed in a concave shape when viewed from the side, with the lower side open, and is provided in two locations, one on the left and one on the right. The front-to-back width inside the concave portion of the hook portion b1 is wider than the front-to-back width of the upper flange portion 751 of the existing crossbeam 74b, making it easier to engage the hook portion b1 with the upper flange portion 751 of the existing crossbeam 74b from above. To attach the engaging hook B to the new flooring material 74a, the flooring material attachment part b2 is placed on the upper surface of the new flooring material 74a, and the nut b31 is tightened onto the bolt b3 provided on the new flooring material 74a. This simple structure allows the new flooring material 74a to be firmly attached, ensuring a secure attachment. To remove it, simply loosen and remove nut b31.

[0023] [Structure of flooring guide] The floor material guide C guides the movement of the newly installed floor material 74a in the extension direction and is attached to the upper surface of the upper flange portion 751 of the existing crossbeam 74b. The floor material guide C is equipped with a rotating engagement part c1 and a fixed engagement part c2 positioned on the left and right sides of the upper surface of the upper flange portion 751 of the existing crossbeam 74b. The rotating engagement portion c1 and the fixed engagement portion c2 have the same structure as the rotating engagement portion a11 and the fixed engagement portion a12 provided on the aforementioned crossbeam mounting portion a1. In other words, the rotating engagement portion c1 is equipped with a bolt c3 (bolt a13 in the crossbeam mounting portion a1) for switching between a non-rotatable state and a rotatable state. By tightening this bolt c3, the rotating engagement portion c1 is made non-rotatable and the engaged state is maintained, and by loosening the bolt c3, the rotating engagement portion c1 is made rotatable and the engagement is released. Furthermore, the fixed engagement portion c2 engages with and disengages from the rear end of the upper flange portion 751 of the existing crossbeam 74b by placing the main body portion a on the upper surface of the upper flange portion 751 and sliding it in the front-rear direction.

[0024] The floor material guide C has guide boards c4 (see Figure 5) erected to support and guide the left and right ends of the new floor material 74a when it moves forward. The guide board c4 can guide the new flooring material 74a so that it does not shift from side to side by slightly touching or coming close to the left and right edges of the new flooring material 74a when the new flooring material 74a moves forward. Furthermore, a sliding projection c5 is provided on the upper surface of the floor material guide C to reduce resistance when the newly installed floor material 74a moves forward. Three sliding protrusions c5 are provided on the left, right, and center between the two guide plates c4. When the flooring material is placed on the upper surfaces of these three sliding protrusions c5, contact with the underside of the new flooring material 74a is reduced, thereby reducing the sliding resistance that occurs when the new flooring material 74a moves in the extension direction, and allowing the new flooring material 74a to slide and move smoothly.

[0025] Referring to Figures 2 to 7, the installation operation of the new flooring material 74a on the newly installed crossbeam 75a using the flooring material installation jig A will be explained. Figures 2 and 3 show the floor material installation jig A attached to the new crossbeam 75a, Figure 5 shows the new floor material 74a and the new crossbeam 75a being moved in the extension direction, and Figures 6 and 7 show the completed installation state where the new floor material 74a is installed on the upper surface of the lower flange portion 750 of the new crossbeam 75a. Figure 4 shows the state in which the arm portion b is connected to the main body portion a. When attaching the main body a of the flooring installation jig A to the newly installed crossbeam 75a, and attaching the new flooring 74a to the flooring mounting part a22 of the flooring installation jig A, the new crossbeam 75a is positioned close to the existing crossbeam 74b. At this time, the newly installed crossbeam 75a is supported by the crossbeam delivery device 1 described later, and is prevented from falling during its extension operation to reach a predetermined position. Furthermore, the newly installed flooring material 74a is placed on top of the existing crossbeam 74b. Additionally, an engagement hook B is attached to the rear end of the newly installed flooring material 74a. Furthermore, a floor material guide C is attached to the upper surface of the upper flange portion 751 of the existing crossbeam 74b, so as to hold the new floor material 74a in place on both sides.

[0026] Starting from the initial state shown in Figures 2 and 3, the newly installed crossbeam 75a and the newly installed flooring material 74a are moved forward. When the center of gravity of the newly installed flooring material 74a is shifted forward in the moved state shown in Figure 5, the front end of the newly installed flooring material 74a lowers, using the existing crossbeam 74b as a fulcrum. At this time, as the front end of the newly installed flooring material 74a descends, the arm portion b rotates downward around the arm pivot axis a21, and the flooring material mounting portion a22 rotates around the flooring material pivot axis a23. As the front end of the newly installed flooring material 74a is lowered and the newly installed flooring material 74a is tilted, the newly installed crossbeam 75a and the newly installed flooring material 74a are moved in the extension direction. Due to the pushing force from the movement, the arm portion b rotates downward around the arm pivot axis a21, and the flooring material mounting portion a22 rotates around the flooring material pivot axis a23, so that the newly installed flooring material 74a is installed in the flooring material installation position p1 set on the upper rear surface of the lower flange portion 750 of the newly installed crossbeam 75a, as shown in Figures 6 and 7. At this time, the engaging hook B engages with the upper flange portion 751 of the existing crossbeam 74b from above, so that the rear end of the new floor material 74a is placed on the floor material installation position p2 set on the front upper surface of the lower flange portion 750 of the existing crossbeam 74b, and the new floor material 74a is supported horizontally between the existing crossbeam 74b and the new crossbeam 75a.

[0027] The floor material installation jig A has an arm pivot axis a21 that pivots the arm b and a floor material pivot axis a23 that pivots the floor material mounting part a22. As the floor material pivot axis a23 rotates in accordance with the downward rotation of the arm b, the new floor material 74a can smoothly change from its initial state to a horizontal state when it is in motion, to an inclined state when it is in motion, and from an inclined state to the completed installation state (horizontal state). The positional relationship between the arm pivot axis a21, which pivots the arm portion b, and the floor material pivot axis a23, which pivots the floor material mounting portion a22, is such that, with the rotation of the arm portion b and the floor material mounting portion a22, the newly installed floor material 74a is supported in a horizontal position between the existing crossbeam 74b and the new crossbeam 75a.

[0028] Here, the newly installed crossbeam 75a and the existing crossbeam 74b have a narrower upper flange portion 751 than the width of the lower flange portion 750. This is done to make it easier to bolt the angle bracket that will ultimately secure the scaffolding 7 in place by narrowing the width of the upper flange portion 751. Furthermore, this is to prevent the front end of the new flooring material 74a from coming into contact with the upper flange portion 751 when the arm portion b rotates downward, and to prevent the rear end of the new flooring material 74a from coming into contact with the upper flange portion 751 of the existing crossbeam 74b.

[0029] (Invention 2) [Overall structure of the crossbeam delivery device] Figure 8 is an overall view of the crossbeam delivery device 1. The crossbeam delivery device 1 comprises a delivery main body 11 and a crossbeam delivery frame 14. In this embodiment, the crossbeam delivery device 1 has two identical crossbeam delivery frames 14 installed on the left and right sides, as shown in Figure 9. From the perspective of preventing falls, two or more crossbeam feeding devices 1 are used for each crossbeam (H-shaped steel) 75, and it is supported at multiple points. Then, the crossbeams (H-shaped steel) 75 are sent out from each crossbeam sending device 1 to the extension position at approximately the same speed. Furthermore, two of the transmission main unit 11 are installed in the front-to-back direction on a single crossbeam transmission frame 14.

[0030] (Transmission unit) The main delivery unit 11 supports the crossbeam delivery frame 14 so that it can slide back and forth. The main body of the delivery unit 11 has a fixing part 111, and as shown in Figure 8, a load is applied when the newly installed crossbeam 75a is delivered, so it is fixed to the existing crossbeam 74b, which has sufficient support capacity among the installed scaffolding 71. The fixing part 111 is located below the main delivery body part 11 and is detachably fixed to the existing crossbeam 74b of the installed scaffolding 71 with fasteners or the like. In this embodiment, the main body 11 is fixed to the existing crossbeam 74b of the installed scaffolding 71, but it does not have to be the existing crossbeam 74b, as long as there is a supporting member on the side of the installed scaffolding 71. For example, if the installed scaffolding 71 is close to the leg 53 of the elevated structure 5 and there is no existing crossbeam 74b to fix the launching body 11, it may be attached to the plate girder (elevated main member) 51 via auxiliary material, or it may be attached to the leg 53 of the elevated structure 5. Depending on the diverse conditions under the elevated structure, the target to which the launching body 11 is fixed can be changed as appropriate. Furthermore, in this embodiment, two of the delivery main body units 11 are installed in the front-to-back direction on a single crossbeam delivery frame 14. This is to distribute and support the load on the crossbeam launching frame 14 when the newly installed crossbeam 75a is extended in the extension direction from the already installed scaffolding 71. Since the installed scaffolding 71 is often narrow, it is preferable to have two main delivery units 11. Furthermore, it is sufficient to have at least one transmission unit 11, and there is no prerequisite for having three or more. In any case, the main unit 11 is fixed to some component of the already installed scaffolding 71.

[0031] (Cross beam delivery frame) The main unit 11 is placed on the existing crossbeam 74b of the installed scaffolding 71 and fastened to the existing crossbeam 74b via the fixing part 111. The crossbeam delivery frame 14 is positioned on the upper part of the delivery body 11 and is supported by the delivery body 11 so as to be able to slide back and forth. The crossbeam delivery frame 14 is long, and the crossbeam delivery frame 14 is supported by the delivery body 11 using a sliding support section 141. The slide support portion 141 is fixed to the upper end of the delivery body portion 11 with fastening members such as bolts and nuts (not shown). The slide support section 141 is through which the crossbeam delivery frame 14 passes from front to back, and is formed in a rectangular cylindrical shape that is long in the vertical direction when viewed from the front, with a width that is slightly wider from left to right than the width of the crossbeam delivery frame 14. Furthermore, rollers 1412 are pivotally supported above and below the slide support section 141 to support the top and bottom of the crossbeam feed frame 14. When the crossbeam feed frame 14 slides in the front-to-back direction, these rollers 1412 support the top and bottom of the crossbeam feed frame 14 as they roll, allowing the crossbeam feed frame 14 to slide smoothly.

[0032] A crossbeam support section 15 is fixed to the crossbeam delivery frame 14 to suspend and hold the newly installed crossbeam 75a. The crossbeam holding section 15 is positioned on the front crossbeam delivery frame 14 of the front delivery main body section 11 and is fixed to the crossbeam delivery frame 14. The crossbeam support section 15 is through which the crossbeam delivery frame 14 passes from front to back, and is formed in a rectangular cylindrical shape that is long in the vertical direction when viewed from the front, and is fixed to the crossbeam delivery frame 14 with fastening members such as bolts and nuts (not shown). Below the crossbeam support section 15, a sturdy and flexible suspension device 151, such as a chain, is provided, and a crossbeam connecting section 152 is detachably connected to the lower end of this suspension device. The suspension device 151 can be exemplified by a freely bendable rope or wire, but it can also be made from a non-bendable material such as a rod. The crossbeam connecting portion 152 is placed on the upper surface of the upper flange portion 751 of the newly installed crossbeam 75a and fixed with fastening members such as bolts and nuts (not shown). By connecting the lower end of the suspension device 151 to the crossbeam connecting portion 152, the newly installed crossbeam 75a can be connected to the crossbeam holding portion 15. By releasing the connection between the lower end of the suspension device 151 and the crossbeam connecting portion 152, the newly installed crossbeam 75a can be removed from the crossbeam holding portion 15. This type of crossbeam holding section 15 allows the newly installed crossbeam 75a to be moved in the extension direction as the crossbeam delivery frame 14 slides in the extension direction, by connecting the newly installed crossbeam 75a to the suspension device 151. As a structure for connecting the lower end of the suspension device 151 to the crossbeam connecting portion 152, an example is a hook (not shown) in which a snap hook (not shown) is attached to the lower end of the suspension device 151 and the snap hook is hooked onto the upper surface of the crossbeam connecting portion 152.

[0033] (Transmission operation of the crossbeam transport device) As shown in Figures 9(A)(B) and 10, the crossbeam feeder 1 with the structure described above can perform two feed operations. As the first delivery operation, as shown in Figure 9(A), the crossbeam delivery frame 14 is pushed forward, allowing the newly installed floor material 74a, the newly installed crossbeam 75a, and the crossbeam delivery frame 14 to be delivered together in the extension direction as a single unit. As a second delivery operation, as shown in Figure 9(B), the newly installed flooring material 74a is pushed forward, allowing the newly installed flooring material 74a, the newly installed crossbeam 75a, and the crossbeam delivery frame 14 to be delivered together in the extension direction. In any of the delivery operations, the newly installed flooring material 74a, the newly installed crossbeam 75a, and the crossbeam delivery frame 14 can be delivered forward as a single unit, as shown in Figure 10.

[0034] [Modified example of a crossbeam delivery device] Figure 11 shows a modified example of the crossbeam delivery device 1'. In this modified example, the crossbeam delivery device 1' has a crossbeam delivery frame 14 fixed to the delivery main body 11, and a crossbeam holding part 15 is slidably mounted on the crossbeam delivery frame 14. The crossbeam delivery frame 14 is fixed so that its front end is positioned beyond the fixed position where the newly installed crossbeam 75a is extended, and the crossbeam holding part 15, which slides along the crossbeam delivery frame 14, can reach the aforementioned fixed position. The crossbeam holding section 15, like the slide support section 141 described above, has the crossbeam delivery frame 14 passing through it from front to back. In a front view, it is formed in a rectangular cylindrical shape that is long in the vertical direction, and its width is slightly wider than the width of the crossbeam delivery frame 14. Furthermore, rollers (not shown) similar to the slide support section 141 described above are pivotally supported above and below the crossbeam holding section 15 to support the top and bottom of the crossbeam delivery frame 14. When the crossbeam holding section 15 slides in the front-to-back direction along the crossbeam delivery frame 14, the aforementioned rollers roll above and below the rail material, allowing the crossbeam delivery frame 14 to slide smoothly.

[0035] [Transfer operation using a modified crossbeam transfer device] As a modified example of the structure described above, the beam delivery device 1' can perform the delivery operation as shown in Figure 11. The delivery operation pushes the newly installed flooring material 74a in the extension direction, allowing the newly installed flooring material 74a, the newly installed crossbeam 75a, and the crossbeam holding part 15 to be delivered together in the extension direction.

[0036] (Scaffolding extension process) (Inventions 1, 2) A method for manufacturing scaffolding under an elevated structure, which extends scaffolding 7 without constructing ground scaffolding, will be explained with reference to Figures 9 and 10.

[0037] (Process 1) Step 1 is the step of installing the main body 11 of the crossbeam delivery device 1 onto the already installed scaffolding 71 (the installation structure is as described in

[0030] and Figure 8). The main unit of the delivery mechanism 11 is fixed to the existing crossbeam 74b at the very front of the installed scaffolding 71 and to the existing crossbeam 74b located behind it. Since multiple crossbeam delivery devices 1 are installed in the left-right direction on the installed scaffolding 71, multiple delivery body sections 11 of the crossbeam delivery devices 1 are fixed on the installed scaffolding 71.

[0038] (Process 2) Step 2 is the step of arranging the crossbeam delivery frame 14 of the crossbeam delivery device 1 (the arrangement structure is as described in

[0031] and Figure 8). The slide support portion 141 of the crossbeam delivery frame 14 is fixed to the upper end of the delivery body portion 11, and the crossbeam delivery frame 14 is attached by passing through this slide support portion 141. The slide support section 141 is attached to both the frontmost and rearmost extension body section 11 of the installed scaffolding 71.

[0039] (Step 3) Step 3 is the process of connecting the newly installed crossbeam 75a to the crossbeam holding section 15 (the connection structure is as described in

[0032] and Figure 8). A crossbeam connecting part 152 is attached to the upper surface of the newly installed crossbeam 75a, and the lower end of the suspension device 151 of the crossbeam holding part 15, which is fixed to the crossbeam sending frame 14, is connected to this crossbeam connecting part 152. As a result, the newly installed crossbeam 75a is connected to the crossbeam holding part 15 fixed to the crossbeam delivery frame 14, and becomes slidable in conjunction with the front-to-back sliding of the crossbeam delivery frame 14.

[0040] (Step 4) Step 4 is the step of fixing the floor material installation jig A to the newly installed crossbeam 75a (the mounting structure is as described in

[0018] and Figures 2 and 3). In this step, the main body a of the floor material installation jig A is placed on the upper surface of the upper flange portion 751 of the newly installed crossbeam 75a, and then slid forward to engage the fixing engagement portion a12 with the rear end of the upper flange portion 751. Next, the rotating engagement portion a11 is rotated downward to engage with the front end of the upper flange portion 751, and the main body portion a is fixed to the newly installed crossbeam 75a by tightening the bolt a13.

[0041] Step 5 is the step of attaching the new flooring material 74a to the flooring material attachment part a22 of the arm part b (the attachment structure is as described in

[0020] and Figures 2 and 3), and the step of attaching the engaging hook B (limitations of Invention 1 and 2) to the new flooring material 74a (the attachment structure is as described in

[0026] and the figures). In this case, the arm portion b is separate from the main body portion a, and the new flooring material 74a is attached to the flooring material attachment portion a22 of the arm portion b before attaching the arm portion b to the main body portion a in the next step. Alternatively, the new flooring material 74a may be attached to the flooring material attachment portion a22 of the arm portion b while the arm portion b is attached to the main body portion a.

[0042] (Step 6) Step 6 is the step of attaching the arm portion b, to which the new flooring material 74a is attached, to the main body portion a (the attachment structure is as described in paragraph

[0021] and Figure 4). At this time, the floor material guide C is installed on the upper surface of the upper flange portion 751 of the foremost existing crossbeam 74b (the installation structure is as described in paragraphs

[0023] and

[0024] and in Figure 2). The installation position of the floor material guide C is such that when the arm portion b to which the new floor material 74a is attached is attached to the main body portion a, the new floor material 74a fits between the left and right guide plates c4 of the floor material guide C. In this step 6, the newly installed flooring material 74a, the newly installed crossbeam 75a, the crossbeam delivery frame 14, and the crossbeam holding section 15 become one unit. By following steps 1 to 6, the initial state shown in (a) of Figure 9(A)(B) can be achieved.

[0043] (Step 7) Step 7 is the process of sending the new floor material 74a and the new crossbeam 75a to be extended forward (the sending operation is as described in

[0033] and Figures 9(A) and (B)). In this delivery operation, the crossbeam delivery frame 14 may be pushed forward to deliver the new flooring material 74a and the new crossbeam 75a, as shown in Figure 9(A)(b), or the new flooring material 74a may be pushed forward to deliver the new flooring material 74a and the new crossbeam 75a, as shown in Figure 9(B)(b). Regardless of which is pushed forward, the new flooring material 74a and the new crossbeam 75a can be simultaneously moved forward, as shown in Figure 10. As shown in Figures 9(A)(B)(b) and 10(b), when the new flooring material 74a and the new crossbeam 75a are initially moved forward, the new flooring material 74a moves horizontally. Then, when the center of gravity of the newly installed flooring material 74a shifts forward, the front end of the newly installed flooring material 74a lowers using the existing crossbeam 74b as a fulcrum (the lowering motion is as described in

[0026] and Figure 5).

[0044] (Step 8) (Limitations on Inventions 1 and 2) Step 8 involves setting the front end of the new flooring material 74a to the flooring material installation position p1 set on the upper rear surface of the lower flange portion 750 of the new crossbeam 75a (the installation structure is as described in

[0023] and the figure), and engaging the engaging hook B with the foremost existing crossbeam 74b and setting it to the flooring material installation position p2 set on the upper front surface of the lower web 750 of the existing crossbeam 74b (the installation structure is as described in

[0026] and Figure 6). As shown in Figures 9(A)(B)(c) and 10(c), the newly installed flooring material 74a, when installed at flooring material installation positions p1 and p2, is horizontal and held in place by the flooring material installation jig A and engaging hook B against the newly installed crossbeam 75a and the existing crossbeam 74b, preventing displacement or falling, allowing workers to walk safely on the newly installed flooring material 74a.

[0045] (Step 9) Step 9 is the process of laying the remaining new flooring material 74a using the already installed scaffolding 71, the extended new flooring material 74a, and the new crossbeams 75a. The workers walk on the installed scaffolding 71, the extended new flooring 74a, and the new crossbeams 75a, and sequentially install the remaining new flooring 74a at the flooring installation positions p1 and p2 on the lower flange portions 750 of the new crossbeams 75a and the existing crossbeams 74b.

[0046] (Step 10) Step 10 is the process of fixing the newly installed crossbeam 75a to the plate girder (elevated main member) 51 using support members 77. The worker walks on the newly laid flooring material 74a that was laid in process 9, and fixes the newly laid crossbeam 75a, which is suspended and held in place by the crossbeam support section 15, to the plate girder (elevated main member) 51 using the support material 77. Subsequently, as shown in Figures 9(A)(B)(d) and 10(d), the worker removes the beam retaining part 15 from the newly installed beam 75a, removes the floor installation jig A from the newly installed floor material 74a and the newly installed floor material 75a, removes the engagement hook B from the newly installed floor material 74a and the existing beam 74b, and further removes the floor guide C from the existing beam 74b. Then, all the laid flooring materials are secured using fastening components such as bolts and nuts (not shown).

[0047] In this way, the extension process of the method for manufacturing scaffolding under an elevated structure, which extends scaffolding 7 without constructing ground scaffolding, is completed (see Figures 9(A)(B)(d) and 10(d)). The extended scaffolding 7 becomes the installed scaffolding 71, and the process returns to step 1, starting the extension process for a new elevated scaffolding manufacturing method. While embodiments of the present invention have been described in detail with reference to the drawings and various modifiable forms have been explained, the specific configuration is not limited to these embodiments, and design changes and the like that do not depart from the spirit of the present invention are also included.

[0048] Furthermore, the aforementioned embodiments and various forms can be combined by utilizing each other's technologies, as long as there are no particular contradictions or problems in their purpose, structure, etc. [Explanation of Symbols]

[0049] A: Flooring installation jig p1: Flooring installation location a: Main body b: Arm section a1: Crossbeam mounting section a21: Arm pivot axis a22: Flooring mounting section a23: Flooring rotation axis 14: Crossbeam delivery frame 141: Slide support part 11: Sending unit 111: Fixed part 74a: New flooring 75a: Newly installed crossbeam 74b: Existing crossbeam 750: Lower flange section 751: Upper flange section

Claims

1. The process of attaching the flooring installation jig to the newly installed crossbeam, The process of attaching the front end of the newly installed flooring material to the flooring material installation jig. The process of extending both the new crossbeams and the new flooring materials in the direction of extension. The flooring installation jig supports the front end of the newly installed flooring so that it can be lowered. The process involves using a floor installation jig to lower the front end of the new floor material so that it rests on the floor material installation position of the new crossbeam. A method for manufacturing scaffolding under elevated structures, including the method described above.

2. A flooring installation jig comprising a main body, an arm, and a flooring material mounting section, wherein the main body has a crossbeam mounting section and is attached to the upper flange of a newly installed crossbeam, the arm is attached to the main body via an arm pivot axis, and the flooring material mounting section is attached to the arm via a flooring material pivot axis and attaches the front end of the flooring material, and when the arm and flooring material mounting section move downward, the front end of the newly installed flooring material is placed on the lower flange of the newly installed crossbeam.

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