JP2025145364A - Scaffolding installation method for boiler furnace hopper - Google Patents

Abstract

To provide a method for installing a scaffold for a boiler furnace hopper, which allows for free installation positioning and movement even when a heavy object is placed on the scaffold without causing a shortage of strength in the scaffold.
[Solution] In the boiler furnace hopper scaffolding installation method, an erection structure (9) is erected in which a main scaffolding is installed vertically on a support frame assembled inside the boiler furnace hopper, and a plate-shaped body with a one-handed handrail made mainly of aluminum material is hung vertically integrally between the main scaffolding, and rectangular plate-shaped aluminum material is laid over the entire surface of the furnace between the top of the erection structure to construct a full-surface work floor.The support frame is constructed of a U-shaped support frame (10a) having a horizontal base frame material and vertical column members (12) erected from the four corners and diagonal column members extended from the four corners, inclined toward the long side, and whose tips are connected to each other, and an L-shaped support frame (10b) having a pair of vertical column members (12) erected from the end of one short side of the horizontal base frame material and diagonal column members extended from the four corners, inclined toward the long side, and whose tips are connected to each other.
[Selected Figure] Figure 2

Description

This invention relates to a method for installing scaffolding for the boiler furnace hopper of a boiler, etc., installed at a thermal power plant, etc.

Conventionally, for boilers installed at thermal power plants and other facilities, furnace inspection scaffolding is assembled and disassembled during boiler inspection and modification work. Furnace inspection scaffolding is divided into suspended and freestanding types, but in either case, the scaffolding weighs 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, additional temporary scaffolding must be installed for assembling the erection structure.

Various methods are known for installing such furnace inspection scaffolding, including the installation methods described in Patent Documents 1 and 2.

The support structure for the boiler furnace inspection scaffold described in Patent Document 1 is a structure used to install this inspection scaffold. It is constructed by installing a single foldable support frame body within the boiler furnace hopper, consisting of a horizontal base frame member, vertical and diagonal pillar members pivotally supported at the four corners of the frame member, and scaffold members laid on the frame member. The upper ends of the diagonal pillar members of the first support frame body are engaged with the lower ends of the vertical pillar members of other foldable support frame bodies, and other support frame bodies are then installed and stacked, and other support frame bodies are then installed and assembled in sequence.

Patent Document 2 also describes a method for constructing scaffolding for cavernous facilities by lifting multiple scaffolding blocks one by one with wires, moving them through the air, and stacking and installing them around a cavernous facility with an internal cavity. The method 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. The first scaffolding block and the second scaffolding block each include a work floor on which on-site workers perform work and support columns extending vertically from both ends of the work floor, and wire support members are attached to the work floor to support the wires so that they can be freely attached when lifting the scaffolding block.

Patent No. 2916402 JP 2023-91279 A

However, with 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 deflecting. When installing an inspection scaffolding 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 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, because 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 a gap. Furthermore, when one-handed handrail plates 116 are attached to the support frame 110, the adjacent one-handed handrail plates 116 may also interfere with each other.

If inspection scaffolding is installed with such interference between the vertical column members 112 or gaps between the support frames 110, the joint strength between the support frames 110 will be insufficient, resulting in a lack of strength for the inspection scaffolding and potentially hindering the safe execution of inspection work.

Furthermore, conventional inspection scaffolding involves bridging aluminum lumber scaffolding between erected structures, but when placing a heavy load on this aluminum lumber scaffolding, steel members are placed on top of the aluminum lumber scaffolding to bridge the erected structures, and the heavy load is placed on this steel member. When moving the heavy load, a wheeled cart is used, which can use the steel member as a rail to move the heavy load.

However, this method of moving has the problem that it limits the locations where heavy objects can be placed, making it impossible to place or move heavy objects to any desired location.

The present invention was made in light of these circumstances, and its objective is to provide a method for installing scaffolding for the boiler furnace hopper section that prevents the inspection scaffolding from becoming weak due to deformation of the support frame, and allows for flexible installation and movement even when heavy objects are placed on the inspection scaffolding.

The boiler furnace hopper scaffolding installation method of the present invention involves assembling a support frame between the inclined surfaces inside the boiler furnace hopper, erecting multiple erection structures within the support frame, with multiple levels of main scaffolding installed vertically, setting the span between adjacent erection structures to 1900 mm or more, and suspending multiple levels of single-sided handrail-equipped plate-shaped structures made primarily of aluminum material between the main scaffolding of the erection structures, and then laying rectangular aluminum plate-shaped materials across the entire surface of the furnace between the upper parts of the erection structures to create a full-surface work floor. In this installation method, the support frame is constructed using a U-shaped support frame comprising a rectangular horizontal base frame member, vertical column members erected from the four corners of the horizontal base frame member, and diagonal column members extending from the four corners, sloping in the long side direction and connected at their tips; and an L-shaped support frame comprising the rectangular horizontal base frame member, a pair of vertical column members erected from the end of one short side of the horizontal base frame member, and diagonal column members extending from the four corners, sloping in the long side direction and connected at their tips.

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 attached to the vertical column members of each of the U-shaped support frame and the L-shaped support frame.

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

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

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

In 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 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.

In addition, a reinforcing frame is installed directly below the full-surface work floor, improving the strength of the full-surface work floor, making it possible to place heavy objects anywhere on the full-surface work floor and to move heavy objects freely across the full-surface work floor.

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. FIG. FIG. 2 is a front view of a boiler furnace hopper scaffold according to an embodiment of the present invention. FIG. 1 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. FIG. 1 is an exploded perspective view of an L-shaped support frame used in a boiler furnace hopper scaffold according to an embodiment of the present invention. 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. 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. FIG. 2 is a plan view of a boiler furnace hopper scaffold according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a conventional method for installing scaffolding for a boiler furnace hopper.

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

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

The boiler furnace hopper scaffolding installation method according to this embodiment is a scaffolding installation method for inspecting furnace walls inside boiler furnace hoppers installed at thermal power plants and other facilities. For boiler inspection and modification work, the furnace inspection scaffolding is assembled and dismantled after the work is completed. As shown in Figure 1, multiple installation structures 9, each consisting of a combination of support frames 10a, 10b, are installed on the road wall of the boiler furnace hopper 1, indicated by the two-dot chain line, with an installation span of 1900 mm or more. A work floor (not shown) is then installed between the installation structures 9. Next, multiple layers of single-sided handrail-equipped plate-shaped structures 2 are hung vertically between the installation structures 9, and rectangular aluminum plates are then laid across the entire surface of the furnace between the tops of the installation structures 9 to create a full-surface work floor.

As shown in Figure 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 combines one U-shaped support frame 10a with multiple L-shaped support frames 10b, and the vertical column members 12 extending vertically between 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 located at the left end of each level in Figure 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, so 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 can be placed anywhere on each level.

As shown in Figure 3, the U-shaped support frame 10a comprises a horizontal base member 11 made of rectangular timbers, vertical pillar members 12 erected vertically 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 inclined ends pointing in the direction of the long sides of the horizontal base member 11. A core scaffolding 15 is attached to the U-shaped support frame 10a so that it abuts against the horizontal base member 11, and handrail members 16 are attached via clamp members 20 (described below) attached to the vertical pillar members 12 and diagonal pillar members 13.

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, a pair of vertical pillar members 12 erected vertically 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 to it so that it abuts 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.

As shown in FIG. 5 , the clamp member 20 attached to the vertical column member 12 or the diagonal column member 13 includes a clamp body base 24 attached to the vertical column member 12 or the diagonal column member 13, and a clamp body 21 assembled to rotate freely around a pivot 25 formed on the clamp body base 24. The clamp body 21 has an arc-shaped configuration 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 into the screw hole 26. 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 secure the handrail member 16. Furthermore, 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, thereby achieving the state shown by the dotted line in FIG. 5 . Assembly is then possible.

Next, the installation method for the boiler furnace hopper scaffolding according to this embodiment will be described with reference to Figures 6 and 7. As shown in Figure 6, the installation method for the boiler furnace hopper scaffolding according to this embodiment involves installing a U-shaped support frame 10a so that it abuts the road wall of the boiler furnace hopper when installing the erection structure 9. 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 pins 30. The U-shaped support frame 10a and the L-shaped support frame 10b are preferably installed by lowering them using a crane 3. Various conventionally known methods can be used to secure the support frames, so detailed explanations are omitted.

Then, an 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 member 12 is 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 interference between adjacent support frames, and allows the support frames to be installed reliably without forming gaps between them.

In addition, when installing the L-shaped support frame 10b, the handrail member 16 can be moved horizontally to avoid interfering with adjacent support frames during the lifting and lowering process. This allows the handrail member 16 to be retracted from its original mounting position, preventing interference between the vertical column member 12 of the already installed support frame and the handrail member 16 being installed during the lifting and lowering process, further improving workability.

After installing the U-shaped support frame 10a and the L-shaped support frame 10b, loosen the clamp member 20, move the handrail member 16, and then close the clamp member 20 again to secure it in the correct position.

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

Then, rectangular aluminum plate 50 is laid so that its longitudinal direction is parallel to the beams 41 between the erected structures. The aluminum plate 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 50 is supported on the beams 41 between the erected structures and the reinforcing beams 42, reinforcing the lower part of the full-area work floor and making the upper surface of the full-area work floor smooth, making it possible to place or move heavy objects anywhere.

Furthermore, as shown in Figure 7(b), the full-scale work floor may be laid so that an inter-construction structure beam 41 is spanned between the erection structures 9 directly below the full-scale work floor, and the longitudinal direction of the plate-shaped aluminum lumber 50 is oriented 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 Figure 7(a), not only is the reinforcing beam 42 unnecessary, but the full-scale 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 there is no need to install scaffolding to span the reinforcing beam 42, improving work efficiency.

According to the boiler furnace hopper scaffolding installation method according to this embodiment, the support frame is constructed from a U-shaped support frame and an L-shaped support frame, and the one-handed handrail plate 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.

In addition, a reinforcing frame is installed directly below the full-surface work floor, improving the strength of the full-surface work floor, making it possible to place heavy objects anywhere on the full-surface work floor and to move heavy objects freely across the full-surface work floor.

In the boiler furnace hopper scaffolding installation method described above, the clamp members 20 were attached to the vertical column members 12 and the diagonal column members 13. However, 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 forms are also within the technical scope of the present invention.

1 Furnace hopper section, 2 Plate-shaped body with one-sided handrail, 3 Crane, 9 Erecting 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 Thumb screw, 23 Stopper, 24 Clamp body base, 25 Pivot, 26 Screw hole, 30 Pin, 41 Erecting structure inter-beam, 42 Reinforcement beam, 50 Aluminum plate.

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 work, it is preferable that the handrail member is moved in a direction away from the adjacent support frame along the extension direction of the handrail member so that the handrail member does not interfere with the adjacent support frame .

Claims (5)

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. 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. 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. 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. 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.