Scaffold for In-Pipe Work and Movable Scaffold for In-Pipe Work

Abstract

To provide scaffolds for work in pipe excellent in safety and allowing detachment on temporary stairs installed in an obliquely placed pipe line to be easily carried out, and moveable scaffolds for work in the pipe easily installed at a desired position within the pipe line, excellent in workability and allowing movement in the pipe to be easily carried out.SOLUTION: Scaffolds 10 for work in a pipe comprises: a scaffold part 16; a front side support part 18 supporting the front side of the scaffold 16 that is to be the upstream side of a pipe line 11 upon usage and detachably fixed on left / right column support parts 13 of temporary stairs 12; a rear side support part 19 supporting the rear side of the support scaffold part 16 that is to be the downstream side of the pipe line 11 upon usage and detachably fixed on the left / right support column parts 13 of the temporary stairs 12; and a protection fence 30 erected on the scaffold part 16 and surrounding at least a part of a periphery of the scaffold part 16. The scaffolds 10 for work in a pipe is detachably attached on the temporary stairs 12 that has the support columns 13 and a pair of steps 14 connecting the left / right support column parts 13 and that is suspended from the upstream side of the pipe line 11 and placed inside of a bottom part of the pipe line 11 so as to configure moveable scaffolds 32 for work in the pipe.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an in-pipe work scaffold and an in-pipe moving scaffold used during work inside a pipeline arranged obliquely.

Background Art

[0002] Conventionally, in a pipeline where water flows, such as a water pressure pipeline in a hydropower plant, a plurality of pipe bodies are connected and arranged obliquely. Therefore, during work inside the pipeline, such as joining adjacent pipe bodies and painting the inner surfaces of each pipe body, a scaffold is assembled inside the pipeline (pipe body), and the worker moves on the scaffold to perform the work. For example, in the water pressure pipeline renewal method of Patent Document 1, on the inclined surface where the water pressure pipeline is installed, new steel pipes (pipe bodies) in a segmented state are sequentially connected, and welding work between the steel pipes occurs inside the inclined steel pipe. Therefore, as in the prior art, a temporary work scaffold is installed inside the steel pipe. As an in-pipe work scaffold used during work inside a pipeline (pipe body), for example, Patent Document 2 discloses one including a ladder portion and an inner surface band connected to the ladder portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Patent Document 2, the inner surface band is an annular member biased toward the outer circumferential direction. When this inner surface band abuts against the inner surface of the pipe member (pipe body), the ladder portion connected to the inner surface band is fixed at a certain position inside the pipe member. Since it is fixed relying only on frictional force, there is a problem of lacking the certainty and stability of the fixation. Also, every time the scaffold is moved, the fixation by the inner surface band has to be released, and after moving the scaffold, the fixation by the inner surface band has to be performed again, resulting in a problem of lacking workability. Furthermore, although it is provided with a ladder portion and a scaffold portion, the scaffold portion is only a working scaffold horizontally supported by support legs and there are no handrails, fences, etc. around it. Therefore, when an operator slips their foot or loses their balance, there is a risk of falling without being able to support the body, resulting in a problem of lacking safety. Also, a working scaffold is not provided in the range overlapping with the ladder portion in plan view, and the working scaffolds are installed separately on the left and right outer sides of the ladder portion. Since each working scaffold is cantilever-supported by support legs, there are problems of lacking durability and safety. Moreover, in the working scaffold horizontally supported with respect to the inclined ladder portion, the support legs on the downstream side are longer than those on the upstream side, and the distance from the ladder portion to the working scaffold on the downstream side becomes longer. Therefore, it is difficult to go up and down the working scaffold from the downstream side, and the ladder portion has to be moved to the upstream side to go up and down the working scaffold, resulting in a problem of lacking workability. The present invention has been made in view of such circumstances, and an object thereof is to provide a temporary staircase installed in an inclined pipeline that can be easily attached to and detached from, is excellent in workability and safety, can be easily installed at a desired position inside the pipeline, and is also excellent in constructability and work efficiency, and a mobile scaffold for in-pipe work that can be easily moved inside the pipeline.

Means for Solving the Problems

[0005] The in-pipe work scaffold according to the first invention along the above object is an in-pipe work scaffold detachably attached to a temporary staircase installed inside the bottom of an inclined pipeline, It has a scaffolding part, a front support part that supports the front side of the scaffolding part, which is the upstream side of the pipeline during use, and is detachably fixed to the left and right support columns of the temporary staircase, a rear support part that supports the rear side of the scaffolding part, which is the downstream side of the pipeline during use, and is detachably fixed to the left and right support columns of the temporary staircase, and a protective fence that is erected on the scaffolding part and surrounds at least a part of the outer periphery of the scaffolding part. Here, the pipeline is composed of a plurality of pipe bodies, among which there are pipe bodies not only circular but also with a part of the circumferential direction cut off and removed, such as a semi-circle or a quarter-circle, and only an arc-shaped bottom remains.

[0006] In the in-pipe working scaffold according to the first invention, it is preferable that the protective fence surrounds the left and right side parts and the rear part of the scaffolding part, and an opening / closing part for the operator to go up and down between the scaffolding part and the temporary staircase is formed at the rear position of the protective fence.

[0007] In the in-pipe working scaffold according to the first invention, the front support part may have left and right front legs, a front leg connecting body that connects the lower end sides of the left and right front legs, and left and right front leg fixtures that are attached to the front leg connecting body and hold the left and right support columns of the temporary staircase respectively. The rear support part may have left and right rear legs, a rear leg connecting body that connects the lower end sides of the left and right rear legs, and left and right rear leg fixtures that are attached to the rear leg connecting body and hold the left and right support columns of the temporary staircase respectively.

[0008] In the in-pipe working scaffold according to the first invention, it is more preferable that the rear support part is provided with one or a plurality of footrests that connect the middle of the longitudinal directions of the left and right rear legs.

[0009] The in-pipe working mobile scaffold according to the second invention that meets the above object is an in-pipe working mobile scaffold that is temporarily installed movably inside a pipeline arranged obliquely, It has left and right support columns and a plurality of steps that connect the left and right support columns, a temporary staircase that is suspended from the upstream side of the pipeline and installed inside the bottom of the pipeline, and an in-pipe working scaffold according to the first invention that is detachably attached to the temporary staircase.

[0010] In the mobile scaffolding for in-pipe work according to the second invention, the temporary staircase can be provided with support protrusions that protrude from the left and right support columns respectively and abut against the lower inner surface of the pipe body.

[0011] In the mobile scaffolding for in-pipe work according to the second invention, the temporary staircase may be provided with a plurality of pairs of moving wheels attached to the left and right support columns.

Effect of the Invention

[0012] The scaffolding for in-pipe work according to the first invention has a front support part and a rear support part that respectively support the front side and the rear side of the scaffolding part and are detachably fixed to the left and right support columns of the temporary staircase. Therefore, it is easy to attach to and change the attachment position of the temporary staircase, has excellent workability, and is excellent in the certainty and stability of fixing to the temporary staircase. Further, the scaffolding for in-pipe work according to the first invention has a protective fence that surrounds at least a part of the outer periphery of the scaffolding part, so it can effectively prevent workers from falling from the scaffolding part.

[0013] In the scaffolding for in-pipe work according to the first invention, when the protective fence surrounds the left and right side parts and the rear part of the scaffolding part, and an opening / closing part for workers to go up and down between the scaffolding part and the temporary staircase is formed at the rear position of the protective fence, it can surely prevent workers from falling from the scaffolding part, and when necessary, by opening the opening / closing part, workers can easily move back and forth between the scaffolding part and the temporary staircase, and the workability is excellent.

[0014] In the scaffold for in-pipe work according to the first invention, when the front support portion has left and right front legs, a front leg connecting body that connects the lower end sides of the left and right front legs, and left and right front leg fixtures that are attached to the front leg connecting body and hold the left and right support columns of the temporary staircase respectively, and the rear support portion has left and right rear legs, a rear leg connecting body that connects the lower end sides of the left and right rear legs, and left and right rear leg fixtures that are attached to the rear leg connecting body and hold the left and right support columns of the temporary staircase respectively, it is excellent in the durability of the front support portion and the rear support portion and the support stability of the scaffold portion. In addition, according to the interval between the left and right support columns of the temporary staircase, the intervals between the left and right front leg fixtures and the left and right rear leg fixtures can be adjusted respectively, and the scaffold for in-pipe work can be surely attached to the temporary staircase, and it has excellent versatility.

[0015] In the scaffold for in-pipe work according to the first invention, when the rear support portion includes one or a plurality of footrest portions that connect the middle of the longitudinal direction of the left and right rear legs, even if the inclination of the pipeline is steep and the rear legs (the vertical distance from the rear end of the scaffold portion to the temporary staircase) are long, the operator can easily move back and forth between the scaffold portion and the temporary staircase by using the footrest portions, and it has excellent workability.

[0016] In the mobile scaffold for in-pipe work according to the second invention, since the scaffold for in-pipe work is detachably attached to the temporary staircase that is suspended from the upstream side of the pipeline and installed inside the bottom of the pipeline, inside the pipeline, it is possible to move the scaffold for in-pipe work together with the temporary staircase or to move only the position of the scaffold for in-pipe work on the temporary staircase while fixing the temporary staircase, and it has excellent work efficiency.

[0017] In the mobile scaffold for in-pipe work according to the second invention, when the temporary staircase includes support protrusions that protrude from the left and right support columns respectively and contact the lower inner surface of the pipeline, it is possible to prevent the temporary staircase from moving forward and backward (in the axial direction of the pipeline) and left and right (in the circumferential direction of the pipeline), and it has excellent fixing stability of the scaffold for in-pipe work.

[0018] In the mobile scaffold for in-pipe work according to the second invention, when the temporary staircase includes a plurality of pairs of moving wheels attached to the left and right support columns, it is possible to smoothly move the temporary staircase along the axial direction of the pipeline when necessary, and it has excellent labor saving property.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0020] Subsequently, with reference to the attached drawings, embodiments embodying the present invention will be described to facilitate understanding of the present invention. As shown in FIGS. 1 to 5, a scaffold 10 for in-pipe work according to an embodiment of the present invention is detachably attached to a temporary staircase 12 installed inside the bottom of a pipeline 11 that is inclined and arranged like a water pressure pipeline of a hydroelectric power plant shown in FIGS. 4 and 5 when working inside the pipeline 11. As the temporary staircase 12, those having left and right support columns 13 made of a single pipe and a plurality of steps 14 connecting the left and right support columns 13 are preferably used, but are not limited thereto. Note that the pipeline 11 is composed of a plurality of pipe bodies 11a. As shown in FIGS. 1, 2, and 5, the scaffold 10 for in-pipe work has a scaffold portion 16 on which a plurality of scaffold boards 15 are laid. In the present embodiment, the outer periphery of the scaffold portion 16 is surrounded by a peripheral wall portion 16a, but its height is appropriately selected and part or all of it may be omitted. Note that the shape and size of the scaffold portion 16 are appropriately selected according to the inner diameter of the pipeline 11 (pipe body 11a), etc. In addition, the scaffold 10 for in-pipe work supports the front side of the scaffold portion 16 that becomes the upstream side of the pipeline 11 during use, and has a front support portion 18 that is detachably fixed to the left and right support columns 13 (see FIG. 5) of the temporary staircase 12. It also has a rear support portion 19 that supports the rear side of the scaffold portion 16 that becomes the downstream side of the pipeline 11 during use and is detachably fixed to the left and right support columns 13 of the temporary staircase 12.

[0021] Here, the front support portion 18 has left and right front legs 20, a front leg connecting body 21 that connects the lower ends of the left and right front legs 20, and left and right front leg fixing tools 22 that are attached to the front leg connecting body 21 and hold the left and right support columns 13 of the temporary staircase 12 respectively. The rear support portion 19 has left and right rear legs 24, a rear leg connecting body 25 that connects the lower ends of the left and right rear legs 24, and left and right rear leg fixing tools 26 that are attached to the rear leg connecting body 25 and hold the left and right support columns 13 of the temporary staircase 12 respectively. As shown in this embodiment, clamps are preferably used for the front leg fixing tools 22 and the rear leg fixing tools 26, but the front leg fixing tools and the rear leg fixing tools only need to be able to hold the support columns (the front legs and the rear legs can be fixed to the columns). The shape (structure) and the fixing method are appropriately selected according to the shape of the support columns and the like. By making the intervals between the left and right front leg fixing tools 22 and the intervals between the left and right rear leg fixing tools 26 adjustable respectively, it is possible to cope with temporary staircases with different intervals between the left and right support columns 13, and it has excellent versatility. In addition, the rear support portion 19 is provided with a footrest portion 27 that connects the middle of the left and right rear legs 24 in the longitudinal direction. Thus, even if the inclination of the pipeline 11 is steep and the rear legs 24 (the vertical distance from the rear end of the scaffold portion 16 to the temporary staircase 12) are long, the operator can easily move back and forth between the scaffold portion 16 and the temporary staircase 12 by using the footrest portion 24. In this embodiment, two footrest portions are provided, but the number of footrest portions is appropriately selected according to the length of the rear legs and can be one or three or more. Also, the front support portion 18 and the rear support portion 19 are reinforced with reinforcing materials 28a and 28b, but the number and arrangement of the reinforcing materials are appropriately selected.

[0022] The scaffold 10 for in-pipe work has a protective fence 30 that is erected on the scaffold part 16 and surrounds at least a part of the outer periphery of the scaffold part 16. In the present embodiment, the protective fence 30 is formed in a substantially U-shape in plan view so as to surround the left and right side portions and the rear portion of the scaffold part 16. And an opening / closing part 30a for an operator to go up and down between the scaffold part 14 and the temporary staircase 12 is formed at the rear position of the protective fence 30. Thereby, it is possible to surely prevent the operator from falling from the scaffold part 16, and when necessary, the operator can easily move back and forth between the scaffold part 16 and the temporary staircase 12 just by opening the opening / closing part 30a. Note that the shape and arrangement of the protective fence are appropriately selected. Also, in the present embodiment, the opening / closing part 30a is a single-opening rotary type, but it may be a double-opening rotary type (butterfly opening).

[0023] As shown in FIG. 4, the temporary staircase 12 with the scaffold 10 for in-pipe work configured as described above is suspended from the upstream side of the pipeline 11 by the suspension and movement connecting member 31 and installed inside the bottom of the pipeline 11, thereby functioning as a mobile scaffold 32 for in-pipe work. In the present embodiment, two scaffolds 10 for in-pipe work are attached to the temporary staircase 12, but the length of the temporary staircase and the number and arrangement of the scaffolds for in-pipe work attached to the temporary staircase are appropriately selected. The operator can perform work while moving back and forth between the scaffold 10 for in-pipe work and the temporary staircase 12. Also, if necessary, it is possible to move only the scaffold 10 for in-pipe work while fixing the temporary staircase 12, or to move the entire mobile scaffold 32 for in-pipe work along the axial direction of the pipeline 11 by the suspension and movement connecting member 31. One end side of the suspension and movement connecting member 31 is fixed to the upstream side of the pipeline 11 (not shown), and the other end side is connected to a connector (not shown) attached to the temporary staircase 12. As the connecting member 31 for both suspension and movement, a wire, a chain, or the like is preferably used, but it is not limited thereto, and it is appropriately selected in consideration of the weight of the in-pipe work scaffold 32 (the in-pipe scaffold 10 and the temporary staircase 12) and workers. As the coupler, a ring-shaped one is preferably used, but it is not limited thereto, as long as the connecting member for both suspension and movement can be connected. Further, the coupler is preferably attached to the upstream end of the left and right support columns, but may be attached to the middle of the longitudinal direction of the support column or any step.

[0024] Here, as shown by the phantom line in FIG. 5, the temporary staircase 12 may be provided with support protrusions 34a that protrude from the left and right support columns 13 respectively (for example, arranged in a V shape when viewed from the front) and contact the lower region of the inner surface 33 of the pipeline 11. Thereby, the front and rear (axial direction of the pipeline 11) and left and right (circumferential direction of the pipeline 11) movement of the temporary staircase 12 during work is prevented. The number and arrangement of the support protrusions are appropriately selected. Further, as shown by the phantom line in FIG. 5, if a plurality of pairs of moving wheels 34b are attached to the left and right support columns 13 of the temporary staircase 12, the temporary staircase 12 can move smoothly along the axial direction of the pipeline 11 when necessary. The number and arrangement of the moving wheels are appropriately selected. In particular, when the temporary staircase is provided with both support protrusions and moving wheels, each can be moved (advanced and retracted) in the radial direction of the pipeline. During work (when the temporary staircase is fixed), at least the support protrusions are grounded on the inner surface of the pipeline, and when moving, only the moving wheels are grounded on the inner surface of the pipeline. In addition, in FIG. 4, a part of the pipeline 11 is covered by a tunnel 35. Also, a fixing base 36 is provided at a part of the pipeline 11 (here, the downstream end) to cover and fix the outer periphery of the pipe body 11a with concrete, and important points in the longitudinal direction of the pipeline 11 are supported by a plurality of small supports 37.

[0025] The embodiments of the present invention have been described above. However, the present invention is not limited to the configurations described in the above embodiments, and includes other embodiments and modifications that can be considered within the scope of the matters described in the claims. Among the components constituting the scaffold for in-pipe work, metals such as stainless steel are preferably used as the material for the components not specifically designated. However, considering the required strength, durability, etc. for each part, various materials can be appropriately selected, and synthetic resin (including reinforced plastic) can also be used partially. The scaffold board may be made of wood. In the above-described embodiment, the scaffold for in-pipe work and the movable scaffold for in-pipe work have been described for the case where they are installed in the water pressure pipeline (pipe body) of a hydroelectric power plant. However, these scaffolds for in-pipe work and the movable scaffold for in-pipe work are used when working inside various inclined pipelines.

Explanation of Reference Numerals

[0026] 10: Scaffold for in-pipe work, 11: Pipeline, 11a: Pipe body, 12: Temporary staircase, 13: Support column part, 14: Step, 15: Scaffold board, 16: Scaffold part, 16a: Peripheral wall part, 18: Front support part, 19: Rear support part, 20: Front leg, 21: Front leg connecting body, 22: Front leg fixture, 24: Rear leg, 25: Rear leg connecting body, 26: Rear leg fixture, 27: Footrest part, 28a, 28b: Reinforcing material, 30: Protective fence, 30a: Opening / closing part, 31: Suspension and movement connecting material, 32: Movable scaffold for in-pipe work, 33: Inner surface, 34a: Support protrusion, 34b: Moving wheel, 35: Tunnel, 36: Fixed base, 37: Small support base

Claims

1. A scaffold for in-pipe work that is detachably attached to a temporary staircase installed inside the bottom of an inclined pipeline, comprising a scaffold part, a front support part that supports the front side of the scaffold part, which becomes the upstream side of the pipeline during use, and is detachably fixed to the left and right support columns of the temporary staircase, and a rear support part that supports the rear side of the scaffold part, which becomes the downstream side of the pipeline during use, and is detachably fixed to the left and right support columns of the temporary staircase, and a protective fence erected on the scaffold part and surrounding at least a part of the outer periphery of the scaffold part, wherein the front support part has left and right front legs, a front leg connecting body that connects the lower end sides of the left and right front legs, and left and right front leg fixing tools attached to the front leg connecting body and holding the left and right support columns of the temporary staircase respectively. A scaffold for in-pipe work is characterized by this.

2. In the scaffold for in-pipe work according to Claim 1, the protective fence surrounds both left and right side portions and the rear portion of the scaffold part, and an opening / closing part for an operator to go up and down between the scaffold part and the temporary staircase is formed at the rear position of the protective fence. A scaffold for in-pipe work is characterized by this.

3. In the scaffold for in-pipe work according to Claim 1, the rear support part has left and right rear legs, a rear leg connecting body that connects the lower end sides of the left and right rear legs, and left and right rear leg fixing tools attached to the rear leg connecting body and holding the left and right support columns of the temporary staircase respectively. A scaffold for in-pipe work is characterized by this.

4. In the scaffold for in-pipe work according to Claim 3, the rear support part is provided with one or a plurality of footrest parts that connect the middle of the left and right rear legs in the longitudinal direction. A scaffold for in-pipe work is characterized by this.

5. A mobile scaffold for in-pipe work that is movably installed inside an inclined pipeline, having left and right support columns and a plurality of steps that connect the left and right support columns, a temporary staircase suspended from the upstream side of the pipeline and installed inside the bottom of the pipeline, and a scaffold for in-pipe work according to any one of Claims 1 to 4 that is detachably attached to the temporary staircase. A mobile scaffold for in-pipe work is characterized by this.

6. In the mobile scaffold for in-pipe work according to claim 5, the temporary staircase is characterized in that it has support protrusions protruding from the left and right support portions respectively and contacting the lower inner surface of the pipeline.

7. In the mobile scaffold for in-pipe work according to claim 5, the temporary staircase is characterized in that it has a plurality of pairs of moving wheels attached to the left and right support portions.

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