Installation method of scaffolding for boiler furnace hopper part

Abstract

Provided is an installation method for a scaffold of a boiler furnace hopper section that enables free placement and movement of heavy objects on the inspection scaffold without insufficient strength of the inspection scaffold occurring. 【Solution means】In an installation method for a scaffold of a boiler furnace hopper section, a erected structure 9 with a main scaffold installed in the height direction on a support frame assembled in the boiler furnace hopper is erected. A plate-shaped body with a handrail on one side mainly made of aluminum material is integrally spanned in the height direction between the main scaffolds, and a rectangular plate-shaped aluminum material is laid on the upper part between the erected structures across the entire furnace to construct a full-surface work floor. The support frame is constructed with a U-shaped support frame 10a having a horizontal base frame material, vertical column members 12 erected from the four corners, and inclined column members extending from the four corners, inclined toward the long side direction, and having their tips 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 inclined column members extending from the four corners, inclined toward the long side direction, and having their tips connected to each other.

Description

Technical Field

[0001] The present invention relates to an installation method for a scaffold of a boiler furnace hopper part such as a boiler installed in a thermal power plant or the like.

Background Art

[0002] Conventionally, in a boiler installed in a thermal power plant or the like, an in-furnace inspection scaffold is assembled and disassembled for inspection work and renovation work of the boiler. The in-furnace inspection scaffold is classified into a suspended type and a self-supporting type. In either case, since the weight of the scaffold is several tens of tons, it is necessary to install a erection structure for supporting the inspection scaffold in the furnace. In order to assemble this erection structure in the boiler furnace hopper, it is further necessary to temporarily install a scaffold for assembling the erection structure.

[0003] Various methods are known for such an installation method of the in-furnace inspection scaffold. For example, the installation methods described in Patent Document 1 and Patent Document 2 are known.

[0004] The support structure of the boiler furnace inspection scaffold described in Patent Document 1 is a structure used for installing this inspection scaffold. In the boiler furnace hopper, one foldable support frame body composed of a horizontal base frame member, vertical column members and inclined column members pivotally supported at the four corners of the frame member, and a scaffold member laid on the frame member is installed. The lower end of the vertical column member of another foldable support frame body is engaged with the upper end of the inclined column member of the support frame body, and the other support frame bodies are stacked and installed, and the other support frame bodies are sequentially installed and assembled.

[0005] In addition, the method for constructing a scaffold for cavity equipment described in Patent Document 2 is a method for constructing a scaffold for cavity equipment by lifting a plurality of scaffold blocks one by one with wires and moving them in the air, stacking and installing them on a cavity equipment having a cavity inside. It has at least a first step of installing a first scaffold block at the bottom of the cavity equipment, and a second step of installing a second scaffold block different from the first scaffold block above the first scaffold block. The first scaffold block and the second scaffold block each include a work floor part where a field worker performs work, and a support part extending in the height direction from both ends of the work floor part. A wire support member for detachably supporting the wire when lifting the scaffold block is attached to and used on the work floor part.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, according to the inspection scaffold installation method described in Patent Document 1 and Patent Document 2, the boiler furnace hopper is supported by an external backing, 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 a vertical bolt is attached to the corner where the support frame contacts the boiler furnace hopper, and the deflection of the boiler furnace hopper described above is absorbed by the expansion and contraction of the vertical bolt, and the horizontal base frame members are installed in parallel. However, since it is to be installed on the inclined surface of the boiler furnace hopper, the horizontal base frame members may be deformed by the wedge effect of the inclined surface and become non-horizontal. In this case, as shown in FIG. 8, the adjacent vertical column members 112 of the adjacent support frames 110 interfere with each other and a gap is generated. Also, when attaching a one-handed handrail plate-like body 116 to the support frame 110, the adjacent one-handed handrail plate-like bodies 116 may also interfere with each other.

[0008] When installing an inspection scaffold in a state where such interference of the vertical column members 112 and gaps between the support frames 110 occur, the joint strength between the support frames 110 is insufficient, resulting in insufficient strength of the inspection scaffold and potentially hindering the safe execution of inspection work.

[0009] Also, in a conventional inspection scaffold, an aluminum material scaffold is spanned between erection structures. However, when placing a heavy object on this aluminum material scaffold, steel materials are arranged to span between the erection structures on the aluminum material scaffold, and the heavy object is placed on the steel materials. When moving the heavy object, a wheeled trolley using the steel materials as rails is used to move the heavy object.

[0010] However, in such a moving method, there is a problem that the installation location of the heavy object is limited and the heavy object cannot be placed or moved to an arbitrary location.

[0011] The present invention has been made in view of such a situation, and provides an installation method for a scaffold of a boiler furnace hopper part that can prevent a decrease in the strength of the inspection scaffold due to deformation of the support frame, and can freely set the installation position and movement of a heavy object on the inspection scaffold. The problem is to provide an installation method.

Means for Solving the Problems

[0012] In the installation method of the scaffold of the boiler furnace hopper part according to the present invention, a support frame is assembled between inclined surfaces in the boiler furnace hopper, and a plurality of erection structures in which a plurality of main scaffolds are installed in a plurality of stages in the height direction are erected in the support frame. The span of adjacent erection structures is set to 1900 mm or more, and two or more one-sided handrail-attached plate-like bodies mainly made of aluminum materials are integrally bridged in a plurality of stages in the height direction between the main scaffolds of the erection structures. Next, in the installation method of the scaffold of the boiler furnace hopper part, a rectangular plate-shaped aluminum material is laid on the upper part of the erection structure to construct a full-surface work floor over the entire furnace, and the support frame includes a rectangular horizontal base frame member, vertical column members erected from the four corners of the horizontal base frame member, and inclined column members extending from the four corners and inclined in the long side direction with their tips connected to each other. It is characterized in that it is constructed with a U-shaped support frame having the above, a 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 the inclined column members extending from the four corners and inclined in the long side direction with their tips connected to each other, and an L-shaped support frame having the above.

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

[0014] Further, in the installation method of the scaffold of the boiler furnace hopper part according to the present invention, the support frame is installed by suspending it from above at a predetermined position, and during the suspension work, the handrail member is so as not to interfere with adjacent support frames, move the handrail member in a direction away from the adjacent support frame along the extending direction of the handrail member is preferable.

[0015] In the method for installing the scaffold of the boiler furnace hopper part according to the present invention, it is preferable that a beam between erection structures is spanned directly below the full-surface work floor, a reinforcing beam perpendicular to the beam between erection structures is spanned, and the plate-shaped aluminum material is laid such that its longitudinal direction is substantially parallel to the beam between erection structures.

[0016] In the method for installing the scaffold of the boiler furnace hopper part according to the present invention, it is preferable that a beam between erection structures is spanned directly below the full-surface work floor, and the plate-shaped aluminum material is laid such that its longitudinal direction is in a direction substantially orthogonal to the beam between erection structures.

Advantages of the Invention

[0017] According to the method for installing the scaffold of the boiler furnace hopper part according to the present invention, since the support frame is constructed by a U-shaped support frame and an L-shaped support frame, and the single-handed handrail plate-like body is slidably assembled to the vertical column member, even when the support frame is installed on the boiler furnace hopper, the vertical column members of the adjacent support frames do not interfere with each other, and it becomes possible to join the support frames more firmly.

[0018] Further, since a reinforcing frame is spanned directly below the full-surface work floor, the strength of the full-surface work floor is improved, and it becomes possible to place a heavy object at an arbitrary position on the full-surface work floor or freely move the heavy object on the full-surface work floor.

Brief Description of the Drawings

[0019]

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Mode for Carrying Out the Invention

[0020] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention.

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

[0022] The installation method of the scaffold for the boiler furnace hopper part according to this embodiment is an installation method of a scaffold for inspection of the furnace wall inside the boiler furnace hopper installed in a thermal power plant or the like. For boiler inspection work or renovation work, an in-furnace inspection scaffold is assembled and disassembled after the work. As shown in FIG. 1, a plurality of erection structures 9 formed by combining support frames 10a and 10b are installed on the furnace wall of the boiler furnace hopper part 1 indicated by a two-dot chain line so that the installation span is 1900 mm or more, and a work floor (not shown) is installed between the erection structures 9. Then, a plurality of one-sided handrail plate-like bodies 2 are spanned in the height direction between the erection structures 9, and then a rectangular plate-like aluminum material is laid on the entire surface of the furnace between the upper parts of the erection structures 9 to construct a full-surface work floor.

[0023] As shown in FIG. 2, the erection structure 9 is constructed by combining a U-shaped support frame 10a and an L-shaped support frame 10b. Specifically, each stage of the erection structure 9 is combined with one U-shaped support frame 10a and a plurality of L-shaped support frames 10b, and the vertical column members 12 extending in the vertical direction of the adjacent support frames 10a and 10b are arranged so as not to contact each other. More specifically, for example, the support frame arranged at the left end in FIG. 2 of each stage is set as the U-shaped support frame 10a, and the remaining support frames are combined with the L-shaped support frame 10b. Note that only one support frame is assembled in the lowermost stage, 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 may be arranged at any position of each stage.

[0024] As shown in FIG. 3, the U-shaped support frame 10a includes a horizontal base member 11 formed by combining square pipes in a rectangular shape, vertical column members 12 erected vertically from the four corners of the horizontal base member 11, and inclined column members 13 whose base ends extend from the four corners of the horizontal base member 11 and whose tips are connected to each other while being inclined in the long side direction of the horizontal base member 11. Further, a main scaffold 15 is attached to the U-shaped support frame 10a so as to abut on the horizontal base member 11, and a handrail member 16 is assembled via a clamp member 20 (described later) attached to the vertical column members 12 and the inclined column members 13.

[0025] As shown in FIG. 4, the L-shaped support frame 10b includes a horizontal base member 11 formed by combining rectangular steel bars in a rectangular shape, similar to the U-shaped support frame 10a, a pair of vertical column members 12 erected vertically from both ends of one short side of the horizontal base member 11, and inclined column members 13 whose base ends extend from the four corners of the horizontal base member 11 and whose tip ends are connected to each other while being inclined in the long side direction of the horizontal base member 11. Further, similar to the U-shaped support frame 10a, the L-shaped support frame 10b has a main scaffold 15 attached so as to abut against the horizontal base member 11, and a handrail member 16 is assembled via a clamp member 20, which will be described later, attached to the vertical column member 12 and the inclined column member 13.

[0026] As shown in FIG. 5, the clamp member 20 attached to the vertical column member 12 and the inclined column member 13 has a clamp body base 24 attached to the vertical column member 12 and the inclined column member 13, and a clamp body 21 pivotally assembled around a pivot 25 formed in the clamp body base 24. The clamp body 21 has an arc shape corresponding to the shape of the handrail member 16 in order to hold the handrail member 16, and a screw hole 26 is formed on the base end side. A wing screw 22 is detachably assembled in the screw hole 26. By tightening the wing screw 22, the end of the wing screw 22 abuts against a stopper 23 formed in the clamp body base 24, and the clamp body 21 is rotated clockwise in FIG. 5 to fix the handrail member 16. Further, when assembling the handrail member 16, the wing screw 22 is loosened or removed to make the clamp body 21 freely rotatable around the pivot 25, and it can be assembled by setting it in the state shown by the dotted line in FIG. 5.

[0027] Next, with reference to FIGS. 6 and 7, the installation method of the scaffold for the boiler furnace hopper section according to this embodiment will be described. As shown in FIG. 6, in the installation method of the scaffold for the boiler furnace hopper section according to this embodiment, a U-shaped support frame 10a is installed so as to abut against the side wall of the boiler furnace hopper when the erection structure 9 is installed. At this time, on the side opposite to the vertical column member 12 of the inclined column member 13, an outer inclined column member 14 is arranged along the side wall, and the lower end of the U-shaped support frame 10a and the outer inclined column member 14 are connected to each other via a pin 30. It should be noted that it is preferable to perform the hanging operation using the crane 3 for the installation of the U-shaped support frame 10a and the L-shaped support frame 10b. Also, regarding the fixing method of the support frame, since various conventionally well-known fixing methods can be adopted, detailed description is omitted.

[0028] Thereafter, an L-shaped support frame 10b is installed adjacent to the previously installed U-shaped support frame 10a. At this time, the L-shaped support frame 10b is arranged such that the short side on the side where the vertical column member 12 is not erected is close to the adjacent U-shaped support frame 10a. Thereby, it is possible to surely install the support frame without the vertical column members 12 contacting each other, without the adjacent support frames interfering with each other, and without forming a gap or the like between the adjacent support frames.

[0029] Also, when installing the L-shaped support frame 10b, during the hanging operation, the handrail member 16 is moved horizontally so as not to interfere with the adjacent support frame, and the operation is performed by retracting it from the original mounting position of the handrail member 16, thereby preventing the vertical column member 12 of the support frame already installed during the hanging operation from interfering with the handrail member 16 during the installation operation, and it becomes possible to further improve the workability.

[0030] It should be noted that after each installation of the U-shaped support frame 10a and the L-shaped support frame 10b, the clamp member 20 is loosened, the handrail member 16 is moved, and then the clamp member 20 is closed again to fix it in the normal position.

[0031] Next, an overall working floor is installed on the erection structure 9. The overall working floor is configured by arranging a plurality of plate-shaped aluminum members 50 as shown in Fig. 7(a). Below the overall working floor, an inter-erection-structure beam 41 is spanned between the erection structures 9, and a reinforcing beam 42 is spanned between the inter-erection-structure beams 41 along the direction orthogonal to the inter-erection-structure beam 41 (the installation direction of the erection structure 9).

[0032] After that, the rectangular plate-shaped aluminum member 50 is laid in a direction such that its longitudinal direction is parallel to the inter-erection-structure beam 41. The plate-shaped aluminum member 50 is spanned between the erection structures 9 and the reinforcing beams 42. By laying the overall working floor in this way, the plate-shaped aluminum member 50 is supported by the inter-erection-structure beam 41 and the reinforcing beam 42, so the lower part of the overall working floor is reinforced, the upper surface of the overall working floor can be smoothed, and heavy objects can be placed or moved at any location.

[0033] Also, as shown in Fig. 7(b), the overall working floor may be laid such that an inter-erection-structure beam 41 is spanned between the erection structures 9 below the overall working floor and the longitudinal direction of the plate-shaped aluminum member 50 is arranged in a direction orthogonal to the inter-erection-structure beam 41 (parallel to the installation direction of the erection structure 9). In this case, in addition to the fact that the reinforcing beam 42 becomes unnecessary compared to the case of Fig. 7(a), since the overall working floor can be laid while laying the plate-shaped aluminum member 50 from one erection structure 9 toward the adjacent erection structure 9, the installation of a scaffold or the like for spanning the reinforcing beam 42 becomes unnecessary, and the working efficiency is improved.

[0034] According to the installation method of the boiler furnace hopper part scaffold according to the present embodiment described above, since the support frame is constructed by a U-shaped support frame and an L-shaped support frame, and the single-handed handrail plate-like body is slidably assembled to the vertical column member, even when the support frame is installed on the boiler furnace hopper, the vertical column members of the adjacent support frames do not interfere with each other, and it becomes possible to join the support frames more firmly.

[0035] In addition, since a reinforcing frame is spanned directly below the full-surface workbench, the strength of the full-surface workbench is improved, and it becomes possible to place heavy objects at any position on the full-surface workbench or freely move heavy objects on the full-surface workbench.

[0036] In the method for installing the scaffolding of the boiler furnace hopper part according to the above embodiment, the case where the clamp member 20 is attached to the vertical column member 12 or the inclined column member 13 has been described. However, as long as the handrail member 16 can be slidably assembled, the clamp member 20 may be attached to any part of the support frame, and it may be assembled only to the vertical column member 12. It is clear from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Explanation of Signs

[0037] 1 Furnace hopper part, 2 One-sided handrail-attached plate-like body, 3 Crane, 9 Erection structure, 10a U-shaped support frame, 10b L-shaped support frame, 11 Horizontal base member, 12 Vertical column member, 13 Inclined column member, 14 Outer inclined column member, 15 Main scaffold, 16 Handrail member, 20 Clamp member, 21 Clamp body, 22 Butterfly screw, 23 Stopper, 24 Clamp body base, 25 Pivot, 26 Screw hole, 30 Pin, 41 Beam between erection structures, 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 with a plurality of main scaffolds installed in the height direction are erected within the support frame. The span between adjacent erection structures is set to 1900 mm or more, and two or more one-sided handrail-attached plate-like bodies mainly made of aluminum materials are integrally spanned in multiple stages in the height direction between the main scaffolds of the erection structure. Next, in the installation method of the scaffold for the boiler furnace hopper part, a rectangular plate-shaped aluminum material is laid on the entire surface of the furnace between the upper parts of the erection structures to construct a full-surface work floor. The installation method of the scaffold for the boiler furnace hopper part is characterized in that the support frame is constructed by a U-shaped support frame having 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 and inclined in the long side direction with their tips connected to each other, and an L-shaped support frame having a 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 the diagonal column members extending from the four corners and inclined in the long side direction with their tips connected to each other.

2. In the installation method of the scaffold for the boiler furnace hopper part according to Claim 1. The installation method of the scaffold for the boiler furnace hopper part is characterized in that it has handrail members slidably assembled to the respective vertical column members of the U-shaped support frame and the L-shaped support frame.

3. In the installation method of the scaffold for the boiler furnace hopper part according to Claim 2. The support frame is installed by hanging it from above at a predetermined position. During the hanging operation, the handrail member is moved in a direction away from the adjacent support frame along the extending direction of the handrail member so that the handrail member does not interfere with the adjacent support frame. The installation method of the scaffold for the boiler furnace hopper part is characterized by this.

4. In the installation method of the scaffold for the boiler furnace hopper part according to Claim 1. A beam between the erection structures is spanned directly below the full-surface work floor. A reinforcing beam perpendicular to the beam between the erection structures is spanned. The installation method of the scaffold for the boiler furnace hopper part is characterized in that the longitudinal direction of the plate-shaped aluminum material is laid substantially parallel to the beam between the erection structures.

5. In the installation method of the scaffold for the boiler furnace hopper part according to Claim 1. A beam between the erection structures is spanned directly below the full-surface work floor. The installation method of the scaffold for the boiler furnace hopper part is characterized in that the longitudinal direction of the plate-shaped aluminum material is laid in a direction substantially orthogonal to the intermediate beam of the erection structure.

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