Installation method for boiler furnace hopper part scaffold

Abstract

To provide an installation method of a boiler furnace hopper part scaffold allowing free installation position and move even if a heavy object is placed on its inspection scaffold without causing insufficient strength of the inspection scaffold.SOLUTION: In an installation method of a boiler furnace hopper section scaffold, an erection structure 9 in which a basic scaffold is installed in the height direction is erected on a support frame assembled in a boiler furnace hopper, a plate body with a one-handed handrail mainly made of aluminum sawn lumber is integrally hung in the height direction between the basic scaffolds, and a rectangular plate aluminum sawn lumber is laid on the whole surface of the furnace between the upper parts of the erection structure to construct a full-surface working floor, the support frame is constructed by a U-shaped support frame 10a having a horizontal base frame member, vertical column members 12 erected from four corners, and inclined column members extended from the four corners, inclined toward a long side direction, and connected to one another at tips thereof, and an L-shaped support frame 10b having a pair of vertical column members 12 erected from an end of one short side of the horizontal base frame member, and inclined column members extended from the four corners, inclined toward the long side direction, and connected to one another at tips thereof.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for installing scaffolding for the boiler furnace hopper of a boiler or the like installed in a thermal power plant or the like. [Background technology]

[0002] Conventionally, for boilers installed in thermal power plants and the like, an internal furnace inspection scaffold is assembled and disassembled for boiler inspection and modification work. Internal furnace inspection scaffolds are classified into suspended and freestanding types, but in either case, the scaffold weights several tens of tons, so an erection structure to support the inspection scaffold must be installed inside the furnace. In order to assemble this erection structure inside the boiler furnace hopper, it is also necessary to temporarily install scaffolding for assembling the erection structure.

[0003] Various methods are known for installing such a furnace interior inspection scaffold, and for example, the installation methods described in Patent Documents 1 and 2 are known.

[0004] The support structure for the boiler furnace inspection scaffold described in Patent Document 1 is a structure used for installing this inspection scaffold, and has a structure in which one foldable support frame body is installed inside the boiler furnace hopper, and is made up of a horizontal base frame member, vertical column members and diagonal column members pivoted at the four corners of the frame member, and scaffold members laid on the frame member, and the upper ends of the diagonal column members of the support frame body are engaged with the lower ends of the vertical column members of other foldable support frame bodies, and other support frame bodies are installed in stacks, and then other support frame bodies are installed and assembled in sequence.

[0005] In addition, the method of constructing scaffolding for cavernous facilities described in Patent Document 2 is a method of constructing scaffolding for cavernous facilities by lifting multiple scaffolding blocks one by one with a wire and moving them through the air to a cavernous facility having a cavity inside, and stacking and installing them, and includes at least a first step of installing a first scaffolding block at the bottom of the cavernous facility, and a second step of installing a second scaffolding block different from the first scaffolding block on top of the first scaffolding block, and the first scaffolding block and the second scaffolding block each have a work floor section where on-site workers work and support sections extending in the vertical direction from both ends of the work floor section, and a wire support member is attached to the work floor section to support the wire so that it can be freely attached when lifting the scaffolding block. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 2916402 [Patent Document 2] Japanese Patent Application Publication No. 2023-91279 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the inspection scaffolding installation methods described in Patent Documents 1 and 2, the boiler furnace hopper is supported by a backstay outside the furnace, but the boiler furnace hopper may be deflected. When installing an inspection scaffold using the support frame described above in such a situation, a base with vertical bolts is attached to the corner where the support frame and the boiler furnace hopper meet. The expansion and contraction of the vertical bolts absorbs the deflection of the boiler furnace hopper, allowing the horizontal base frame to be installed parallel. However, since the scaffolding is installed on the slope of the boiler furnace hopper, the wedge effect of the slope can cause the horizontal base frame to deform and become unlevel. In this case, as shown in Figure 8, the adjacent vertical column members 112 of adjacent support frames 110 interfere with each other, creating gaps. Furthermore, when attaching one-hand handrail plates 116 to the support frame 110, the adjacent one-hand handrail plates 116 may also interfere with each other.

[0008] If an inspection scaffolding is set up in a state where such interference between the vertical column members 112 or gaps exist between the support frames 110, the joint strength between the support frames 110 will be insufficient, resulting in a lack of strength in the inspection scaffolding and potentially hindering the safe execution of inspection work.

[0009] In addition, with conventional inspection scaffolding, aluminum lumber scaffolding is hung between the erected structures, but when placing heavy loads on this aluminum lumber scaffolding, steel materials are placed on top of the aluminum lumber scaffolding so that they hang between the erected structures, and the heavy loads are placed on the steel materials.When moving the heavy loads, they are moved using a wheeled cart that can use the steel materials as rails.

[0010] However, with this method of moving, there is a problem in that the location where the heavy object can be placed is limited, and the heavy object cannot be placed or moved to any desired location.

[0011] The present invention was made in consideration of these circumstances, and its objective is to provide a method for installing a boiler furnace hopper scaffold that does not cause a lack of strength in the inspection scaffold due to deformation of the support frame, and that allows the installation position and movement of the inspection scaffold to be freely adjusted even when heavy objects are placed on it. [Means for solving the problem]

[0012] The method for installing scaffolding for a boiler furnace hopper according to the present invention involves assembling a support frame between the inclined surfaces inside the boiler furnace hopper, erecting a plurality of erection structures in which core scaffolding is installed in multiple levels in the height direction within the support frame, setting the span of adjacent erection structures to 1900 mm or more, and integrally spanning multiple levels in the height direction between the core scaffolding of the erection structures, with two or more single-sided handrail-equipped plate-like bodies made mainly of aluminum material, and then laying rectangular plate-like aluminum material over the entire surface of the furnace between the upper parts of the erection structures to construct a full-surface work floor. In the installation method of the above, the support frame is constructed from a U-shaped support frame having a rectangular horizontal base frame material, vertical column members erected from the four corners of the horizontal base frame material, and diagonal column members extending from the four corners, inclined toward the long side, and having their tips connected to each other, and an L-shaped support frame having the rectangular horizontal base frame material, a pair of vertical column members erected from the end of one short side of the horizontal base frame material, and the diagonal column members extending from the four corners, inclined toward the long side, and having their tips connected to each other.

[0013] Furthermore, in the boiler furnace hopper scaffolding installation method according to the present invention, it is preferable to have handrail members that can be slidably assembled to the vertical column members of each of the U-shaped support frame and the L-shaped support frame.

[0014] Furthermore, in the boiler furnace hopper scaffolding installation method according to the present invention, the support frame is installed at a predetermined position by being suspended from above the predetermined position, and during the suspension operation, it is preferable to retract the handrail member from its original position so as not to interfere with adjacent support frames.

[0015] Furthermore, in the boiler furnace hopper scaffolding installation method according to the present invention, it is preferable that a beam between the erection structures is laid directly below the full-scale work floor, a reinforcing beam is laid perpendicular to the beam between the erection structures, and the plate-shaped aluminum material is laid so that its longitudinal direction is approximately parallel to the beam between the erection structures.

[0016] Furthermore, in the boiler furnace hopper scaffolding installation method according to the present invention, it is preferable that a beam between the erection structures is hung directly below the full-surface work floor, and that the plate-shaped aluminum material is laid in a direction such that its longitudinal direction is approximately perpendicular to the beam between the erection structures. [Effects of the Invention]

[0017] According to the boiler furnace hopper scaffolding installation method of the present invention, the support frame is constructed from a U-shaped support frame and an L-shaped support frame, and the one-handed handrail plate-shaped body is attached to the vertical column member so that it can slide freely.Therefore, even when the support frames are installed on the boiler furnace hopper, the vertical column members of adjacent support frames do not interfere with each other, and the support frames can be joined together more firmly.

[0018] In addition, a reinforcing frame is placed directly below the full-surface work floor, improving the strength of the full-surface work floor, making it possible to place heavy objects at any position on the full-surface work floor and to move heavy objects freely on the full-surface work floor. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a boiler furnace hopper scaffold constructed by a boiler furnace hopper scaffold installation method according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of a boiler furnace hopper scaffold according to an embodiment of the present invention. [Figure 3] FIG. 2 is an exploded perspective view of a U-shaped support frame used in a boiler furnace hopper scaffold according to an embodiment of the present invention. [Figure 4] FIG. 2 is an exploded perspective view of an L-shaped support frame used in the boiler furnace hopper scaffolding according to an embodiment of the present invention. [Figure 5]FIG. 10 is a diagram showing the mounting clamp portion of a one-handed handrail plate-shaped body of a support frame used in a boiler furnace hopper section scaffolding according to an embodiment of the present invention. [Figure 6] FIG. 1 is a diagram illustrating a method for installing a scaffold for a boiler furnace hopper according to an embodiment of the present invention. [Figure 7] FIG. 2 is a plan view of a boiler furnace hopper scaffold according to an embodiment of the present invention. [Figure 8] FIG. 1 is a schematic diagram illustrating a conventional method for installing scaffolding for a boiler furnace hopper. DETAILED DESCRIPTION OF THE INVENTION

[0020] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0021] FIG. 1 is a perspective view of a boiler furnace hopper scaffolding constructed by a boiler furnace hopper scaffolding installation method according to an embodiment of the present invention, FIG. 2 is a front view of the boiler furnace hopper scaffolding according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of a U-shaped support frame used in the boiler furnace hopper scaffolding according to an embodiment of the present invention, FIG. 4 is an exploded perspective view of an L-shaped support frame used in the boiler furnace hopper scaffolding according to an embodiment of the present invention, FIG. 5 is a diagram showing the mounting clamp part of a one-handed handrail plate-shaped body of the support frame used in the boiler furnace hopper scaffolding according to an embodiment of the present invention, FIG. 6 is a diagram explaining the installation method of the boiler furnace hopper scaffolding according to an embodiment of the present invention, and FIG. 7 is a plan view of the boiler furnace hopper scaffolding according to an embodiment of the present invention.

[0022] The boiler furnace hopper scaffolding installation method according to this embodiment is a scaffolding installation method for inspecting the furnace walls inside a boiler furnace hopper installed at a thermal power plant or the like. For boiler inspection or modification work, the furnace interior inspection scaffolding is assembled and dismantled after the work is completed. As shown in Fig. 1 , multiple erection structures 9, each consisting of a combination of support frames 10a and 10b, are installed on the road wall of the boiler furnace hopper 1 (shown by the two-dot chain line) with an installation span of 1900 mm or more, and a work floor (not shown) is installed between the erection structures 9. Next, multiple layers of single-sided handrail-equipped plate-shaped structures 2 are installed vertically between the erection structures 9, and rectangular aluminum plate materials are laid across the entire surface of the furnace between the upper parts of the erection structures 9 to form a full-surface work floor.

[0023] As shown in FIG. 2, the erection structure 9 is constructed by combining U-shaped support frames 10a and L-shaped support frames 10b. Specifically, each level of the erection structure 9 is constructed by combining one U-shaped support frame 10a and multiple L-shaped support frames 10b, and the vertical column members 12 extending in the vertical direction of adjacent support frames 10a, 10b are arranged so that they do not come into contact with each other. More specifically, for example, the support frame arranged at the left end of each level in FIG. 2 is a U-shaped support frame 10a, and the remaining support frames are combined with L-shaped support frames 10b. Note that the lowest level has only one support frame assembled, and therefore only a single U-shaped support frame 10a is assembled. Note that the installation position of the U-shaped support frame 10a is not limited to the left end, and it may be arranged at any position on each level.

[0024] As shown in Figure 3, the U-shaped support frame 10a comprises a horizontal base member 11 made up of rectangular timbers combined together, vertical pillar members 12 erected in the vertical direction from the four corners of the horizontal base member 11, and diagonal pillar members 13 whose base ends extend from the four corners of the horizontal base member 11 and whose tips are connected to each other with an inclination toward the long side of the horizontal base member 11. In addition, a main scaffolding 15 is attached to the U-shaped support frame 10a so as to abut against the horizontal base member 11, and handrail members 16 are attached via clamp members 20 (described later) attached to the vertical pillar members 12 and diagonal pillar members 13.

[0025] As shown in Figure 4, the L-shaped support frame 10b, like the U-shaped support frame 10a, comprises a horizontal base member 11 made of rectangular timbers combined together, a pair of vertical pillar members 12 erected in the vertical direction from both ends of one short side of the horizontal base member 11, and diagonal pillar members 13 whose base ends extend from the four corners of the horizontal base member 11 and whose tips are connected to each other with an inclination toward the long side of the horizontal base member 11. Also, like the U-shaped support frame 10a, the L-shaped support frame 10b has a main scaffolding 15 attached so as to abut against the horizontal base member 11, and handrail members 16 attached via clamp members 20 (described later) attached to the vertical pillar members 12 and diagonal pillar members 13.

[0026] As shown in FIG. 5 , the clamp member 20 attached to the vertical column member 12 or the inclined column member 13 includes a clamp body base 24 attached to the vertical column member 12 or the inclined column member 13, and a clamp body 21 assembled to be rotatable around a pivot 25 formed on the clamp body base 24. The clamp body 21 has an arc shape that matches the shape of the handrail member 16 so that it can hold the handrail member 16, and a screw hole 26 is formed on the base end. A thumbscrew 22 is detachably assembled in the screw hole 26, and by tightening the thumbscrew 22, the end of the thumbscrew 22 abuts against a stopper 23 formed on the clamp body base 24, rotating the clamp body 21 clockwise in FIG. 5 to fix the handrail member 16. When assembling the handrail member 16, the thumbscrew 22 is loosened or removed to allow the clamp body 21 to rotate freely around the pivot 25, and assembly is possible by setting it to the state shown by the dotted line in FIG. 5 .

[0027] Next, a method for installing a scaffold for a boiler furnace hopper according to this embodiment will be described with reference to Figures 6 and 7. As shown in Figure 6, in the method for installing a scaffold for a boiler furnace hopper according to this embodiment, a U-shaped support frame 10a is installed so as to abut against the road wall of the boiler furnace hopper when the erection structure 9 is installed. At this time, an outer diagonal column member 14 is placed along the road wall on the side of the diagonal column member 13 opposite the vertical column member 12, and the lower end of the U-shaped support frame 10a and the outer diagonal column member 14 are connected to each other via a pin 30. The U-shaped support frame 10a and the L-shaped support frame 10b are preferably installed by lowering them using a crane 3. Since various conventionally known methods can be used to secure the support frames, detailed explanations are omitted.

[0028] After that, the L-shaped support frame 10b is installed next to the previously installed U-shaped support frame 10a. At this time, the L-shaped support frame 10b is positioned so that the short side on the side where the vertical column members 12 are not installed is close to the adjacent U-shaped support frame 10a. This prevents the vertical column members 12 from coming into contact with each other, prevents adjacent support frames from interfering with each other, and makes it possible to reliably install the support frames without forming gaps between adjacent support frames.

[0029] Furthermore, when installing the L-shaped support frame 10b, the handrail member 16 can be moved horizontally so as not to interfere with adjacent support frames during the lifting-down operation, and the work can be performed by retracting the handrail member 16 from its original mounting position, thereby preventing interference between the vertical column member 12 of the support frame that has already been installed and the handrail member 16 being installed during the lifting-down operation, thereby further improving workability.

[0030] After the U-shaped support frame 10a and the L-shaped support frame 10b are installed, the clamp members 20 are loosened, the handrail member 16 is moved, and the clamp members 20 are closed again to fix the handrail member 16 in the correct position.

[0031] Next, a full-scale work floor is installed on the erection structures 9. The full-scale work floor is constructed by arranging a plurality of plate-shaped aluminum lumber 50 as shown in Fig. 7(a). Directly below the full-scale work floor, inter-emergency structure beams 41 are laid between the erection structures 9, and reinforcing beams 42 are laid between the inter-emergency structure beams 41 in a direction perpendicular to the inter-emergency structure beams 41 (the installation direction of the erection structures 9).

[0032] Thereafter, rectangular aluminum plate lumber 50 is laid with its longitudinal direction parallel to the beams 41 between the erected structures. The aluminum plate lumber 50 is spanned between the erected structures 9 and the reinforcing beams 42. By laying the full-area work floor in this way, the aluminum plate lumber 50 is supported on the beams 41 between the erected structures and the reinforcing beams 42, so the lower part of the full-area work floor is reinforced and the upper surface of the full-area work floor can be made smooth, making it possible to place or move heavy objects at any desired location.

[0033] 7(b), the full-surface work floor may be laid so that an inter-construction structure beam 41 is spanned between the erection structures 9 directly below the full-surface work floor, and the plate-shaped aluminum lumber 50 is arranged so that its longitudinal direction is perpendicular to the inter-construction structure beam 41 (parallel to the installation direction of the erection structures 9). In this case, compared to the case of FIG. 7(a), not only is the reinforcing beam 42 unnecessary, but the full-surface work floor can be laid while laying the plate-shaped aluminum lumber 50 from one erection structure 9 toward the adjacent erection structure 9, so that scaffolding or the like for spanning the reinforcing beam 42 is not required, and work efficiency is improved.

[0034] According to the boiler furnace hopper scaffolding installation method of this embodiment described above, the support frame is constructed from a U-shaped support frame and an L-shaped support frame, and the one-handed handrail plate-shaped body is attached to the vertical column member so that it can slide freely.Therefore, even when the support frames are installed on the boiler furnace hopper, the vertical column members of adjacent support frames do not interfere with each other, and the support frames can be joined together more firmly.

[0035] In addition, a reinforcing frame is placed directly below the full-surface work floor, improving the strength of the full-surface work floor, making it possible to place heavy objects at any position on the full-surface work floor and to move heavy objects freely on the full-surface work floor.

[0036] In the method for installing scaffolding for a boiler furnace hopper according to the above embodiment, the clamp members 20 have been described as being attached to the vertical column members 12 and the diagonal column members 13, but as long as the handrail members 16 can be slidably attached to them, the clamp members 20 may be attached to any part of the support frame, or may be attached only to the vertical column members 12. It is clear from the claims that such modified or improved embodiments are also included within the technical scope of the present invention. [Explanation of symbols]

[0037] 1 furnace hopper section, 2 plate-shaped body with one-sided handrail, 3 crane, 9 erection structure, 10a U-shaped support frame, 10b L-shaped support frame, 11 horizontal base member, 12 vertical column member, 13 diagonal column member, 14 outer diagonal column member, 15 core scaffolding, 16 handrail member, 20 clamp member, 21 clamp body, 22 wing screw, 23 stopper, 24 clamp body base, 25 pivot, 26 screw hole, 30 pin, 41 erection structure inter-beam, 42 reinforcing beam, 50 plate-shaped aluminum material.

Claims

1. A support frame is assembled between the inclined surfaces in the boiler furnace hopper, and a plurality of erection structures are erected in the support frame, with main scaffolding installed in multiple levels in the height direction, and the span of adjacent erection structures is set to 1900 mm or more, and two or more single-sided handrail-equipped plate-like bodies made mainly of aluminum material are integrally suspended in multiple levels in the height direction between the main scaffoldings of the erection structures, Next, a rectangular aluminum plate is laid across the entire surface of the furnace between the upper portions of the erection structures to construct a full-surface work floor. In this method for installing a scaffold for a boiler furnace hopper, a pair of vertical column members erected from the ends of one short side of the horizontal base frame member; and an L-shaped support frame having the rectangular horizontal base frame member, a pair of vertical column members erected from the ends of one short side of the horizontal base frame member, and the diagonal column members extended from the four corners, inclined toward the long side, and connected to each other at their tips.

2. In the boiler furnace hopper scaffolding installation method according to claim 1, A method for installing a scaffold for a boiler furnace hopper, characterized in that handrail members are slidably assembled to the vertical column members of each of the U-shaped support frame and the L-shaped support frame.

3. In the boiler furnace hopper scaffolding installation method according to claim 2, The support frame is installed at a predetermined position by being suspended from above the predetermined position, A method for installing scaffolding for a boiler furnace hopper, characterized in that during the lifting work, the handrail members are retracted from their original positions so as not to interfere with adjacent support frames.

4. In the boiler furnace hopper scaffolding installation method according to claim 1, A beam is laid between the erection structures directly below the full-scale work floor, A reinforcing beam is laid across the beam between the erection structures, and the beam is perpendicular to the beam; A method for installing scaffolding for a boiler furnace hopper, characterized in that the plate-shaped aluminum material is laid so that its longitudinal direction is approximately parallel to the beams between the erection structures.

5. In the boiler furnace hopper scaffolding installation method according to claim 1, A beam is laid between the erection structures directly below the full-scale work floor, A method for installing scaffolding for a boiler furnace hopper, characterized in that the plate-shaped aluminum material is laid in a direction such that its longitudinal direction is approximately perpendicular to the beams between the erection structures.

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