Scaffold unit for opening and method for constructing working scaffold

Abstract

To provide a scaffold unit for an opening, which enables safe work to be performed in the opening of road surface lining, and a work scaffold construction method.SOLUTION: A scaffold unit 1 for an opening portion, which constructs a work scaffold for work in an opening portion 11 formed by removing a lining plate 5 of a road surface lining 3, includes a tread portion 21 on which a worker P can be placed, and a pair of hooking portions 2525 located at both ends at a position higher than the tread portion 21 and respectively hooked and fixed on an upper flange side 7a and a side 7a forming a pair of edge portions of the opening portion 11 facing each other, and is used by being laid between the pair of upper flange side 7a and side 7a by the pair of hooking portions 2525.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a scaffolding unit for an opening and a method for constructing a working scaffolding. [Background technology]

[0002] At cut-and-cover construction sites, road linings are constructed and lining plates are laid on top of the construction site. In this type of road lining, the lining plates are temporarily removed to create an opening when materials are being delivered, and handrails to prevent falls are installed around the periphery of this opening (see, for example, Patent Document 1). Here, below the lining plates in the road lining, there are lining girders that support the lining plates and joint members that connect these lining girders together. Therefore, after removing the lining plates, work such as removing the joint members may be required within the opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5484146 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when working after removing the lining plate as described above, the worker must work inside the opening, which is lower than the lining plate. Therefore, the worker must reach out and work at a position lower than the lining plate, for example, by getting inside the fall prevention handrail and sitting on the edge of the opening. However, working at height in such an unstable condition places a heavy burden on the worker's safety management, so a system that enables safer work is required. In view of this problem, the present invention aims to provide a scaffolding unit for an opening and a method of constructing a work scaffold that enable safe work inside an opening in road surface lining. [Means for solving the problem]

[0005] The gist of the present invention lies in the following [1] to [7].

[0006] [1] A scaffolding unit for an opening that constructs a work scaffold for work within an opening formed by removing a covering plate of a road surface covering, the scaffolding unit comprising: a step portion on which a worker can stand; and a pair of hanging portions that are located at both ends at a position higher than the step portion and are respectively hooked onto and fixed to a pair of opposing edge portions of the opening; the scaffolding unit for an opening is used by being spanned between the pair of edge portions by the pair of hanging portions.

[0007] [2] The scaffolding unit for an opening described in [1], wherein the edge portion is constituted by the upper flange of the lining girder of the road surface lining.

[0008] [3] A scaffolding unit for an opening described in [2], in which both ends of the tread portion in the direction of spanning between the edge portions are respectively placed on the lower flanges of a pair of adjacent lining girders.

[0009] [4] A scaffolding unit for an opening described in any one of [1] to [3], further comprising a handrail portion arranged to rise upward from the end of the tread portion in a direction perpendicular to the bridging direction between the edge portions.

[0010] [5] The handrail portion has a pair of posts located at both ends in the span direction, and the hanging portion is provided on the posts and extends from the posts in the span direction, a scaffolding unit for an opening described in [4].

[0011] [6] A method for constructing a work scaffold for work in an opening formed by removing a covering plate of a road surface covering, the method using a scaffold unit for an opening that has a step portion on which a worker can stand and a pair of hanging portions located at both ends at a position higher than the step portion, and by hanging and fixing the pair of hanging portions onto opposing edge portions of the opening, the scaffold unit for an opening is spanned between the pair of edge portions.

[0012] [7] A method for constructing a work scaffolding as described in [6], wherein the edge portion is constituted by the upper flange of the lining girder of the road surface lining. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a scaffolding unit for an opening and a method for constructing a work scaffold that enable safe work within an opening in a road surface covering. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing a road surface covering to which the scaffolding unit for an opening and the work scaffolding construction method of this embodiment are applied. FIG. [Figure 2] FIG. 10 is a cross-sectional view showing a state in which an opening is formed in a road surface lining. [Figure 3] FIG. 1 is a perspective view of a scaffolding unit for an opening. [Figure 4] This is a cross-sectional view of a road surface covering showing the use of a scaffolding unit. [Figure 5] This is a plan view of the road surface covering showing the use of the scaffolding unit. [Figure 6] FIG. 10 is a plan view showing the installation work of the scaffolding unit. [Figure 7] 10(a) and 10(b) are cross-sectional views showing modified examples of the scaffolding unit. [Figure 8] 10(a) and 10(b) are cross-sectional views showing other modified examples of the scaffolding unit. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of a scaffolding unit for an opening and a method for constructing a work scaffold according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a road lining 3 to which the scaffolding unit for an opening 1 and the method for constructing a work scaffold according to this embodiment are applied. The road lining 3 includes multiple lining plates 5 laid to cover the top of an excavation construction site 100 and multiple lining girders 7 supporting the lining plates 5. The lining girders 7 are made of horizontally extending H-shaped steel beams. Each lining girder 7 in FIG. 1 extends in a direction perpendicular to the plane of the paper. The road lining 3 also includes multiple joint members 9 connecting adjacent lining girders 7. The joint members 9 extend horizontally in a direction perpendicular to the lining girders 7 and are made of, for example, channel members. Both ends of the joint members 9 are bolted to each rib portion 7c of the lining girder 7. The road lining 3 also includes girder supports, earth retaining piles, intermediate piles, etc. that support the lining girders 7, but detailed description and illustration of these will be omitted.

[0016] In the road surface lining 3, some of the lining plates 5 are temporarily removed to form an opening 11 when materials are delivered to the excavation construction site 100. FIG. 2 is a cross-sectional view showing the road surface lining 3 after the opening 11 has been formed. As shown in FIG. 2, the removed lining plates 5 were previously installed between the upper flanges 7a, 7a of adjacent lining girders 7, 7. Therefore, after the removal of the lining plates 5, portions of the opposing upper flanges 7a, 7a are exposed upward, and these paired upper flanges 7a, 7a form a pair of opposing edges of the opening 11. Handrails 12 are installed around the opening 11 to prevent falls. To facilitate the smooth delivery of materials through the opening 11, the joints 9 present within the opening 11 are removed. In this embodiment, a scaffolding unit 1 for openings, shown in a perspective view in FIG. 3, is used to safely remove the joints 9 from within the opening 11. The scaffolding unit 1 for openings is used by bridging between the upper flanges 7a, 7a of the lining girders 7, 7, and is installed in a position immediately adjacent to the joint 9, parallel to the joint 9.

[0017] 3, an XYZ Cartesian coordinate system is defined, and X, Y, and Z may be used to explain the positional relationship of each part of the scaffolding unit 1. The scaffolding unit 1 includes a tread part 21, two supports 23, 23, two hook parts 25, 25, and a handrail part 27.

[0018] The step plate 21 is a portion on which the worker P (FIG. 4) rests, and the worker P places his / her feet on the step plate 21. The step plate 21 is composed of a plate-like member that is rectangular in plan view, with the longer side in the X direction. The dimension of the step plate 21 in the X direction is slightly longer than the distance between the upper flanges 7a, 7a. The dimension of the step plate 21 in the Y direction is not particularly limited as long as the worker P can place his / her feet on it. The material of the step plate 21 is not particularly limited, and may be, for example, a wood material or a metal material. The step plate 21 is provided with stoppers 29, 29 to prevent the worker P from stepping off the step plate 21 in the Y direction or from dropping tools or the like from the step plate 21. The stoppers 29, 29 are plate-shaped and rise vertically from both ends of the step plate 21 in the Y direction. The stoppers 29, 29 are each formed, for example, from a portion of an angle bar fixed to the upper surface of the tread portion 21 by means of welding, bolting, or the like.

[0019] The handrail section 27 is provided to rise upward from one end of the tread section 21 in the Y direction. The handrail section 27 functions as a handrail used by the worker P standing on the tread section 21 and prevents the worker P from falling in the Y direction. The handrail section 27 includes two support posts 23 and two handrail bars 28. The support posts 23 are located at both ends of the handrail section 27 in the X direction. The handrail bars 28 are made of, for example, single-pipe pipes extending in the X direction, and both ends of each handrail bar 28 are fixed to the support posts 23. The length of the handrail section 27 in the X direction is slightly shorter than the length of the tread section 21 in the X direction. The number of handrail bars 28 can be adjusted as appropriate.

[0020] The pillars 23, 23 are provided near both ends of the tread portion 21 in the X direction so as to rise vertically from one end of the tread portion 21 in the Y direction. The pillars 23, 23 are formed, for example, from angle bars fixed to the tread portion 21 by means of welding, bolting, or the like. Attached to the upper end of each of the pillars 23, 23 are hanging fittings 23a, 23a for hanging a lifting wire when lifting the scaffolding unit 1.

[0021] The two hooking portions 25, 25 are portions that are respectively hooked onto the upper flanges 7a, 7a (FIG. 2) that form the opposing edges of the opening 11. The two hooking portions 25, 25 are formed as parts of L-shaped metal fittings that are attached to the respective supports 23, 23 by means of welding, bolting, or the like. The hooking portions 25, 25 protrude horizontally outward in the X direction from the side surfaces of the upper parts of the supports 23, 23, respectively, and protrude further outward than both ends of the tread portion 21. The hooking portions 25, 25 are positioned at a predetermined height higher than the tread portion 21.

[0022] Next, the state of use of the scaffolding unit 1 (the state where it is installed in the opening 11) will be described. Fig. 4 is a cross-sectional view of the road surface covering 3 showing the state of use of the scaffolding unit 1, and Fig. 5 is its plan view.

[0023] The scaffolding unit 1 is installed in the opening 11 immediately adjacent to the joint 9 to be removed so as to be parallel to the joint 9. At this time, the joint 9 is located on the opposite side of the handrail section 27 from the tread section 21. The two hanging sections 25, 25 of the scaffolding unit 1 are hooked onto the upper surfaces of the upper flanges 7a, 7a of the lining girders 7, 7. As a result, the scaffolding unit 1 is supported at both ends by the upper flanges 7a, 7a via the hanging sections 25, 25. The hanging sections 25, 25 are fixed to the upper flanges 7a, 7a using bullmans or the like (not shown). By fixing the hanging sections 25, 25 to the upper flanges 7a, 7a as described above, the hanging sections 25, 25 are prevented from falling off the upper flanges 7a, 7a due to external disturbances or the like.

[0024] In addition, both ends of the tread portion 21 of the scaffolding unit 1 are placed on the upper surfaces of the lower flanges 7b, 7b of the lining girders 7, 7. This results in a state in which part of the weight of the scaffolding unit 1 is distributed not only to the upper flanges 7a, 7a but also to the lower flanges 7b, 7b. To achieve this state of use, in the scaffolding unit 1, the difference in height between the hanging portions 25, 25 and the tread portion 21 is adjusted to correspond to the vertical width of the lining girders 7, 7.

[0025] In this state, worker P stands on the tread 21 between the joint 9 and the handrail 27. Worker P can then access the nearest joint 9 and perform the work of removing the joint 9. That is, worker P can stably perform the work of slinging the joint 9 and releasing the bolts fastened at both ends of the joint 9 on the tread 21. At this time, the presence of the handrail 27 prevents worker P from falling in the Y direction. In addition, the presence of the stoppers 29, 29 prevents worker P from slipping off the tread 21 in the Y direction or from dropping tools or the like downward from the tread 21.

[0026] The work scaffolding construction method of this embodiment constructs a work scaffolding in the opening 11 for work such as removing joint members 9 by installing the scaffolding unit 1 as described above in the opening 11. Before the opening 11 is formed, the scaffolding unit 1 is prepared, for example, on a covering plate 5 that forms the periphery of the opening 11. Figure 6 is a plan view showing the installation work of the scaffolding unit 1. When installing the scaffolding unit 1 in the opening 11 after the covering plate 5 has been removed, the scaffolding unit 1 is hung by a crane using the hoisting fittings 23a, 23a (Figure 3) and is hung into the opening 11 from above the covering plate 5.

[0027] If the scaffolding unit 1 were to be suspended into the opening 11 in a position parallel to the joint 9, both ends of the tread portion 21 would interfere with the upper flanges 7a, 7a of the lining girders 7, 7. Therefore, as shown in FIG. 6 , the scaffolding unit 1 is suspended between the lining girders 7, 7 so that the tread portion 21 is positioned so as not to overlap with the lining girders 7, 7 in a plan view. Specifically, the scaffolding unit 1 is suspended between the lining girders 7, 7 in a position such that the extension direction of the tread portion 21 of the scaffolding unit 1 is oblique to the joint 9 in a plan view. This allows the scaffolding unit 1 to be suspended into the opening 11 while avoiding interference between both ends of the tread portion 21 and the upper flanges 7a, 7a.

[0028] Thereafter, when the tread portion 21 reaches the height between the upper flanges 7a, 7a and the lower flanges 7b, 7b, the scaffolding unit 1 is rotated horizontally as shown by the arrow in Figure 6, so that the scaffolding unit 1 is positioned parallel to the joint 9 as shown in Figure 5. The scaffolding unit 1 is then further lowered, causing the hooking portions 25, 25 to hook onto the upper flanges 7a, 7a, and both ends of the tread portion 21 to rest on the lower flanges 7b, 7b. When removing the scaffolding unit 1, it can be lifted up in the reverse order of the above.

[0029] After the hooking portions 25, 25 are hooked onto the upper flanges 7a, 7a as described above, the worker P works from above the covering plate 5 and fixes the hooking portions 25, 25 to the upper flanges 7a, 7a with a bullman or the like (not shown). After the hooking portions 25, 25 are completely fixed to the upper flanges 7a, 7a in this way, the worker P moves onto the tread portion 21 and performs work.

[0030] Next, the effects of the scaffolding unit 1 and the method for constructing a work scaffold using the same will be described. For example, when removing a joint 9 in an opening 11, it is necessary to perform work such as slinging the joint 9 and releasing the bolts fastened at both ends of the joint 9. Conventionally, a worker P would perform the above-mentioned slinging and bolting by, for example, getting inside a handrail 12 (Fig. 2) and sitting on the edge of the opening 11. Working at a height in such an unstable condition places a heavy burden on the worker P in terms of safety management.

[0031] In contrast, according to the scaffolding unit 1 and the work scaffolding construction method using the same of this embodiment, the scaffolding unit 1 is bridged between the edges of the opening 11 (for example, between the upper flanges 7a, 7a) by the hooking portions 25, 25, so that the scaffolding unit 1 can be installed so as to cross the opening 11, and the worker P can stand on the tread portion 21 of this scaffolding unit 1. Due to the height relationship between the hooking portions 25, 25 and the tread portion 21, the tread portion 21 is positioned at a position lower than the height of the covering plate 5. Therefore, when working on a part of the opening 11 that is lower than the covering plate 5, the worker P can stand on the tread portion 21 and work safely in a stable state. Furthermore, if the scaffolding unit 1 is installed parallel to and immediately adjacent to the joint 9, the worker P can access the joint 9 in a stable state and safely perform the work of removing the joint 9.

[0032] Furthermore, by hooking the hooking portions 25, 25 to the upper flanges 7a, 7a, the scaffolding unit 1 can be spanned in a direction perpendicular to the lining girder 7. In this way, the scaffolding unit 1 can be installed parallel to the joint 9, and can be suitably used for work that handles the joint 9 (for example, work to remove the joint 9).

[0033] In addition, both ends of the tread portion 21 of the scaffolding unit 1 are placed on the upper surfaces of the lower flanges 7b, 7b of the lining girders 7, 7. As a result, the scaffolding unit 1 is engaged with the road surface lining 3 not only at the hook portions 25, 25 but also at the tread portion 21, so that the scaffolding unit 1 can be installed in the opening 11 more stably.

[0034] The present invention can be implemented in various forms, including the above-described embodiment, with various modifications and improvements based on the knowledge of those skilled in the art. Furthermore, it is also possible to configure modified examples by utilizing the technical matters described in the above-described embodiment. The configurations of the respective embodiments may be used in appropriate combination.

[0035] In the embodiment, an example has been described in which the scaffolding unit 1 is used for the work of removing the joint 9, but the scaffolding unit 1 can also be used in exactly the same way for restoration work to reattach the joint 9 to the lining girders 7, 7. Such restoration work is carried out, for example, after the delivery of materials to the excavation construction site 100 through the opening 11 has been completed, and before the lining plate 5 is returned to close the opening 11. Furthermore, the scaffolding unit 1 can also be used for work that handles other parts within the opening 11, not just the joint 9.

[0036] In addition, in the embodiment, both ends of the tread portion 21 of the scaffolding unit 1 in use are placed on the upper surfaces of the lower flanges 7b, 7b of the lining girders 7, 7, respectively, but this configuration is not essential. For example, as shown in FIG. 7(a), the dimension of the tread portion 21 in the X direction may be shorter than the distance between the lower flanges 7b, 7b so that the tread portion 21 does not contact the lower flanges 7b, 7b. In this case, the weight of the scaffolding unit 1 is supported by the upper flanges 7a, 7a through the hanging portions 25, 25. In this case, it is not necessary to first suspend the scaffolding unit 1 in an oblique position as described in FIG. 6, but it is sufficient to suspend it into the opening 11 in an orientation parallel to the joint member 9 in a plan view.

[0037] Furthermore, as shown in Figures 7(b) and 8(a), the difference in height between the hooking portions 25, 25 and the tread portion 21 does not have to match the vertical width of the lining girders 7, 7. In the case of Figure 7(b), when the hooking portions 25, 25 are hooked onto the upper flanges 7a, 7a, the tread portion 21 is positioned below the lower flanges 7b, 7b of the lining girders 7, 7. In the case of Figure 8(a), when the hooking portions 25, 25 are hooked onto the upper flanges 7a, 7a, the tread portion 21 is positioned above the lower flanges 7b, 7b of the lining girders 7, 7. Therefore, the same scaffolding unit 1 can be used for road linings 3 using lining girders 7, 7 of different sizes. In these cases, the weight of the scaffolding unit 1 is supported by the upper flanges 7a, 7a through the hooking portions 25, 25.

[0038] In addition, in the embodiment, the hanging portions 25, 25 of the scaffolding unit 1 in use are placed on the upper surfaces of the upper flanges 7a, 7a of the lining girders 7, 7, respectively, but this configuration is not essential. For example, as shown in Figure 8(b), the hanging portions 25, 25 may be hung on each edge of the lining plate 5 that forms the edge of the opening 11. In the example of Figure 8(b), the scaffolding unit 1 is spanned in a direction parallel to the lining girders 7, 7. [Explanation of symbols]

[0039] 1...scaffolding unit for opening, 3...road surface lining, 5...lining plate, 7...lining girder, 7a...upper flange (edge), 7b...lower flange, 11...opening, 21...tread portion, 23...support, 25...hanging portion, 27...handrail portion, P...worker.

Claims

1. A scaffolding unit for an opening that constructs a work scaffold for work in an opening formed by removing a covering plate of a road surface covering, a step portion on which a worker can be placed; a pair of hooking portions located at both ends at a position higher than the step portion and hooked and fixed onto a pair of opposing edge portions of the opening, A scaffolding unit for an opening that is used by spanning a pair of the edge portions using a pair of the hanging portions.

2. The scaffolding unit for an opening according to claim 1, wherein the edge portion is constituted by an upper flange of a lining girder of the road surface lining.

3. A scaffolding unit for an opening as described in claim 2, wherein both ends of the tread portion in the bridging direction between the edge portions are respectively placed on the lower flanges of a pair of adjacent lining girders.

4. The scaffolding unit for an opening as described in claim 1, further comprising a handrail portion extending upward from the end of the tread portion in a direction perpendicular to the bridging direction between the edge portions.

5. The handrail portion includes a pair of support posts located at both ends in the bridge direction, The scaffolding unit for an opening according to claim 4, wherein the hanging portion is provided on the support and protrudes from the support in the bridging direction.

6. A work scaffold construction method for constructing a work scaffold for work in an opening formed by removing a covering plate of a road surface covering, A scaffolding unit for an opening is provided, which includes a step portion on which a worker can stand and a pair of hook portions located at both ends at a position higher than the step portion, A method for constructing a work scaffold, in which the pair of hanging portions are respectively hung and fixed onto opposing edge portions of the opening, thereby bridging the opening scaffold unit between the pair of edge portions.

7. A method for constructing a work scaffold according to claim 6, wherein the edge portion is constituted by an upper flange of a lining girder of the road surface lining.

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