Method for constructing scaffolding for cavernous facilities

Abstract

To provide a construction method of a scaffolding for a cavity facility increased in workability and safety of a field worker.SOLUTION: In a construction method of a scaffolding for a cavity facility, multiple scaffolding blocks 2 are moved in the air while being lifted up one by one by a wire W to a boiler furnace having a cavity therein, to stack and install. The method has: a first step of installing a first scaffolding block 21 on a bottom part B of the boiler furnace; and a second step of installing a second scaffolding block 22 on an upper part of the first scaffolding block 21. Each of the first scaffolding block 21 and the second scaffolding block 22 has: a work floor 4 for work of a field worker; and portal posts 7 extending in a height direction from both ends of the work floor 4. On the work floor 4, wire supporting members 15 are fitted for supporting the wire W, when lifting up each scaffolding block 2.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a method for constructing scaffolding for cavernous facilities, which is installed inside cavernous facilities such as boiler furnaces in thermal power plants. [Background technology]

[0002] Conventionally, cavernous equipment such as a boiler furnace in a thermal power plant is formed in the shape of a roughly hollow rectangular pillar with an internal cavity, and its bottom has a hopper structure that tapers downward (see, for example, Patent Document 1). A cavernous equipment scaffolding 1 as shown in Fig. 11 is assembled and installed on this bottom B, and the cavernous equipment scaffolding 1 is used, for example, during maintenance such as repairs to the inside of the boiler furnace. A plurality of cavernous equipment scaffolding 1 are installed at predetermined intervals along the longitudinal direction of the bottom B of the boiler furnace.

[0003] As shown in Fig. 12, the cavern facility scaffolding 1 is made up of a plurality of scaffolding blocks 2 (hereinafter, when scaffolding blocks are collectively referred to, the symbol 2 will be used) stacked up. In the cavern facility scaffolding 1, a first scaffolding block 21 is installed at the bottom of the bottom B, and a second scaffolding block 22 and a third scaffolding block 23 are installed on the layer above that, approximately symmetrically when viewed from the side, and three more scaffolding blocks are installed on the layer above that, spreading out in the left-right direction.

[0004] Here, for example, the first scaffolding block 21 is roughly composed of a frame-shaped frame 3 having a pair of side wall portions 6, a work floor 4 provided on the frame 3, a pair of gate-shaped pillars 7 extending vertically from both ends of the work floor 4, a pair of diagonal members 9, and a pair of handrails 11 provided between the pair of gate-shaped pillars 7, as shown in Figure 13.

[0005] When the cavern facility scaffolding 1 is assembled, each scaffolding block 2 is lifted one by one by a crane or the like, moved, and installed in the desired position. More specifically, in the scaffolding block 2, two wires W that are routed under the work floor 4 (see Figures 13 and 14) are each hung on a lifting member L, and the scaffolding block 2 is moved by lifting the lifting member L with a crane or the like. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-201883 Summary of the Invention [Problem to be solved by the invention]

[0007] However, this conventional construction method for cavern facility scaffolding 1 involves stacking multiple scaffolding blocks 2 one on top of the other, which has the drawback of making it very difficult for on-site workers to work. That is, in the conventional construction method, as shown in Figure 15, first, a first scaffolding block 21 is installed at the bottom of the bottom B, and then the on-site worker removes the wire W that is hung from the lifting member L on the first scaffolding block 21.

[0008] 16, a second scaffolding block 22 is installed on the upper layer of the first scaffolding block 21. In this case, a site worker works on the first scaffolding block 21 to connect it to the second scaffolding block 22. For example, the upper ends of the portal-shaped supports 7 and diagonal members 9 of the first scaffolding block 21 are connected to the frame 3 of the second scaffolding block 22.

[0009] Next, the site worker needs to remove the wire W that was lifting the second scaffolding block 22 from the lifting member L, so he climbs up onto the second scaffolding block 22 (see arrow T1) and performs the work of removing the wire W on top of the second scaffolding block 22.

[0010] 17, a third scaffolding block 23 is set up above the first scaffolding block 21 and to the side of the second scaffolding block 22. In this case, the site worker needs to descend onto the first scaffolding block 21 again to perform the work of connecting the first scaffolding block 21 and the third scaffolding block 23 (see arrow T2).

[0011] Furthermore, since the site worker needs to remove the wire W from the third scaffolding block 23, he climbs up onto the third scaffolding block 23 (see arrow T3) and performs the work of removing the wire W from the third scaffolding block 23.

[0012] As described above, in the conventional construction method, the wire W is looped under the work platform 4 and hung on the lifting member L, so the work of removing the wire W must be carried out on the scaffolding block 2. Therefore, the on-site worker has to repeatedly climb up and down between the scaffolding blocks 2 stacked in the vertical direction. This has the drawback of being very inefficient to work with.

[0013] Furthermore, there was also the problem that it was undesirable from a safety standpoint if a site worker were to ascend or descend between the scaffolding blocks 2, as this could result in the worker accidentally falling. For example, when the second scaffolding block 22 was being installed, the third scaffolding block 23 had not yet been installed, so the second scaffolding block 22 was in an unstable installation state, and it was undesirable from a safety standpoint for a site worker to ascend or descend from the second scaffolding block 22 in this state.

[0014] The present invention was devised in light of the above circumstances, and its object is to provide a method for constructing scaffolding for cavern facilities that can improve the workability and safety of on-site workers. [Means for solving the problem]

[0015] The method for constructing scaffolding for cavernous facilities provided by the present invention is a method for constructing scaffolding for cavernous facilities by lifting a plurality of scaffolding blocks one by one with a wire, moving them through the air, and stacking and installing them to a cavernous facility having a cavity inside, and the method comprises 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 on which workers perform work and support sections extending in the height direction from both ends of the work floor section, and a wire support member is attached to the work floor section and used to support the wire so that it can be freely attached when lifting the scaffolding block. The wire support member is configured to be able to pass through a pair of side wall portions erected from the side end portions of the work floor portion, and includes a support bolt having a substantially annular fixed hook portion at one end, and a substantially annular movable hook portion that can be screwed onto the other end of the support bolt, and the wire is engaged with the fixed hook portion and the movable hook portion, respectively. It is characterized by the fact that

[0018] The method for constructing scaffolding for cavernous facilities of the present invention further includes a third step of installing a third scaffolding block, different from the first scaffolding block and the second scaffolding block, above the first scaffolding block and to the side of the second scaffolding block, and the third scaffolding block has a work floor section where workers perform work and support sections extending in the vertical direction from both ends of the work floor section, and it is preferable that a wire support member be attached to the work floor section to support the wire so that it can be freely attached when lifting the scaffolding block. [Effects of the Invention]

[0019] According to the present invention, a wire support member that supports a wire for lifting the scaffolding block in a freely engageable manner is attached to the work floor of the scaffolding block, so that when installing a second scaffolding block on top of a first scaffolding block, the site worker can easily detach the wire from the wire support member that is attached to the work floor of the second scaffolding block on the first scaffolding block. As a result, the site worker does not need to climb up and down between the scaffolding blocks as in conventional construction methods, thereby improving the workability and safety of the site worker. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic perspective view showing the configuration of a scaffolding block to which the method for constructing a scaffolding for cavern facilities of the present invention is applied. [Figure 2] 10A and 10B are diagrams showing a state in which a wire support member is attached to a frame. [Figure 3] 10 is a diagram showing a state in which the wire support member is attached to the frame when not in use. FIG. [Figure 4] FIG. 10 is a diagram showing the state in which the wire is attached to the scaffolding block. [Figure 5] 10A and 10B are diagrams for explaining the procedure for installing scaffolding blocks. [Figure 6] 10A and 10B are diagrams for explaining the procedure for installing scaffolding blocks. [Figure 7] 10A and 10B are diagrams for explaining the procedure for installing scaffolding blocks. [Figure 8] 10A and 10B show a support bolt of a modified wire support member, in which FIG. 10A is a left side view and FIG. [Figure 9] 10A and 10B show a movable hook portion of a modified wire support member, where FIG. 10A is a left side view and FIG. [Figure 10] FIG. 10 is a diagram showing the state in which a wire is attached to a scaffolding block in a modified example. [Figure 11] FIG. 1 is a schematic perspective view of a cavern facility. [Figure 12] FIG. 12 is a schematic side view of a cavern facility scaffold installed in the cavern facility shown in FIG. 11. [Figure 13] FIG. 1 is a schematic perspective view showing the configuration of a conventional scaffolding block. [Figure 14] FIG. 10 is a diagram showing how a wire is attached to a conventional scaffolding block. [Figure 15] 10A and 10B are diagrams for explaining a conventional procedure for installing scaffolding blocks. [Figure 16] 10A and 10B are diagrams for explaining a conventional procedure for installing scaffolding blocks. [Figure 17] 10A and 10B are diagrams for explaining a conventional procedure for installing scaffolding blocks. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0022] In the following description, the drawings referred to in the "Background Art" section will be referred to again, and the same components as those described in the "Background Art" section will be designated by the same reference numerals.

[0023] The construction method for scaffolding 1 for cavernous facilities according to this embodiment is applied to cavernous facilities such as boiler furnaces in thermal power plants. The boiler furnaces in thermal power plants have an overall structure formed in the shape of a roughly hollow rectangular pillar with a cavity inside, and its bottom B has a hopper structure that tapers downward as it goes down, as shown in Figure 11.

[0024] As shown in Figure 12, the cavernous facility scaffolding 1 is made up of multiple stacked scaffolding blocks 2. The cavernous facility scaffolding 1 is made up of a first scaffolding block 21 installed at the bottom of the boiler furnace, a second scaffolding block 22 and a third scaffolding block 23 installed on the layer above that in a generally symmetrical manner when viewed from the side, and three more scaffolding blocks installed on the layer above that so as to extend in the left-right direction.

[0025] Fig. 1 is a schematic perspective view showing the configuration of a first scaffolding block 21. Note that Fig. 1 shows the first scaffolding block 21 with a wire W attached thereto for hoisting it.

[0026] In the first scaffolding block 21, a substantially flat work platform 4 is provided on top of a frame 3 that is frame-shaped (not shown). The frame 3 is made up of a main body 5 (see Figure 4) that is substantially rectangular in plan view, and a pair of side wall sections 6 that stand upright from the left and right ends of the main body 5 along the longitudinal direction of the work platform 4. The work platform 4 is intended for on-site workers to carry out work on its upper surface.

[0027] A pair of gate-shaped pillars 7 are provided at both ends of the frame 3, connecting the pair of side wall portions 6 and extending in the height direction. The pair of gate-shaped pillars 7 are provided opposite each other at both ends of the frame 3. These gate-shaped pillars 7 are for supporting the second scaffolding block 22 or the third scaffolding block 23 that is placed on top of the first scaffolding block 21. Each gate-shaped pillar 7 is provided at its upper end with a connecting member 8 that is approximately U-shaped in side view for connecting to the second and third scaffolding blocks 22, 23.

[0028] Between the pair of gate-shaped pillars 7, a pair of diagonal members 9 are provided, each extending diagonally from the lower part of the gate-shaped pillars 7 along both side wall portions 6 of the frame 3 so as to approach each other and connected at their tip ends, and formed in a roughly mountain shape. The pair of diagonal members 9 are intended to support the second scaffolding block 22 or the third scaffolding block 23 that is placed on top of this first scaffolding block 21. At the tip connection portions of each of the pair of diagonal members 9, a connecting member 10 that is roughly U-shaped in side view is provided for connecting them.

[0029] Additionally, a pair of handrails 11 are provided between the pair of gate-shaped supports 7, extending in the left-right direction along both side wall portions 6 of the frame 3. Each of the pair of handrails 11 is composed of an upper rail, a middle rail, and a lower rail that extend in the left-right direction, and three connecting members that extend in the up-down direction to connect them. The pair of handrails 11 are intended to prevent field workers working on the work platform 4 from falling.

[0030] A jack bolt 12 extending in the height direction is provided at each of the four ends of the frame 3, and a substantially flat jack base 13 is provided at the lower end of each jack bolt 12. The jack base 13 is provided at an angle so as to support the first scaffolding block 21 along the bottom B having a slope.

[0031] A pair of ladder members 14 extending diagonally are provided at both ends of the frame 3. Each ladder member 14 is for supporting the jack bases 13 of the second scaffolding block 22 and the third scaffolding block 23, which are installed on top of the first scaffolding block 21.

[0032] In this embodiment, a plurality of wire support members 15 used when lifting the first scaffolding block 21 are attached to the first scaffolding block 21. As shown in Fig. 2, the wire support member 15 is composed of a U-shaped bolt portion 16 formed in a substantially U-shape and nuts 17 that can be screwed onto both ends of the bolt portion 16.

[0033] Two wire support members 15 are attached to each of the vicinity of one end and the other end of the frame 3. More specifically, as shown in Fig. 4, the tip ends of U-shaped bolt portions 16 are inserted from the outside of the frame 3 into two through holes 6a (see the circled area in Fig. 1) formed in one side wall portion 6 of the frame 3, and a nut portion 17 is screwed into the inside of the side wall portion 6. A wire support member 15 is attached to the other side wall portion 6 of the frame 3 in a similar configuration.

[0034] When lifting the first scaffolding block 21, a wire W is hooked to each of the four wire support members 15. That is, hooks F of two wires W are hooked to the gap S formed between the side wall portion 6 of the frame 3 and the wire support members 15 (see Figures 1 and 4).

[0035] When the wire support member 15 is not in use and the first scaffolding block 21 is not being lifted, the U-shaped bolt portion 16 is pushed inside the side wall portion 6 of the frame 3, as shown in Figure 3, so that a gap S is not formed.

[0036] The two wires W are hung on a lifting member L, and the lifting member L is lifted and moved by a crane or the like, whereby the first scaffolding block 21 is moved and installed in a desired position.

[0037] The second scaffolding block 22 and the third scaffolding block 23 are configured almost the same as the first scaffolding block 21, but since the third scaffolding block 23 is installed on the right side of the second scaffolding block 22, the second scaffolding block 22 does not have a ladder member 14 on the right side compared to the first scaffolding block 21. Furthermore, since the second scaffolding block 22 is installed on the left side of the third scaffolding block 23, the third scaffolding block 23 does not have a ladder member 14 on the left side compared to the first scaffolding block 21, and since it overlaps with the gate-shaped support 7 on the right side of the second scaffolding block 22, the third scaffolding block 23 does not have a gate-shaped support 7 on the left side either.

[0038] Next, a procedure for installing scaffolding blocks 2 in the method for constructing scaffolding 1 for cavernous facilities of the present invention will be described.

[0039] First, the first scaffolding block 21 is assembled on the ground or the like. At this time, as shown in Figures 1 and 4, the wire support member 15 is attached to the side wall portion 6 of the frame 3, and hooks F of two wires W are attached to the gap S formed between the side wall portion 6 of the wire support member 15 and the main body portion 16. Then, the first scaffolding block 21 is moved through the air by lifting the lifting member L with a crane or the like, and is installed at the lowest part of the bottom B of the boiler furnace.

[0040] Once the installation of the first scaffolding block 21 is complete, the site worker removes the wire W that is hung on the lifting member L on the first scaffolding block 21 (see Figure 5). That is, the site worker removes the hook F that is engaged with the wire support member 15 that is attached to the side wall 6 of the frame 3. This separates the first scaffolding block 21 and the wire W.

[0041] Next, the second scaffolding block 22 is assembled, for example, on the ground, and similarly to the first scaffolding block 21, the wire support member 15 is attached and the hook F of the wire W is engaged in the gap S. Then, the second scaffolding block 22 is lifted by a crane or the like using a lifting member L and moved through the air, and is installed above the first scaffolding block 21 along the left slope of the bottom B.

[0042] Once the second scaffolding block 22 is installed above the first scaffolding block 21, the site worker connects the frame 3 of the second scaffolding block 22 on the first scaffolding block 21 to the connecting members 8 of the gate-shaped supports 7 and the connecting members 10 of the diagonal members 9 (see Figure 6).

[0043] Then, the site worker removes the wire W that is hung on the lifting member L on the first scaffolding block 21. That is, the site worker reaches upward and removes the hook F that is engaged in the gap S of the wire support member 15. This separates the second scaffolding block 22 and the wire W.

[0044] In this way, since the wire support member 15 is attached to the side wall portion 6 of the frame 3, the on-site worker can easily remove the wire W of the second scaffolding block 22 from the first scaffolding block 21 below the second scaffolding block 22. Therefore, the on-site worker does not need to climb from the first scaffolding block 21 to the second scaffolding block 22, as in the conventional construction method.

[0045] Next, a third scaffolding block 23, which is assembled, for example, on the ground, is installed above the first scaffolding block 21 and to the side of the second scaffolding block 22. In this case, the third scaffolding block 23 is also moved through the air by lifting a lifting member L using a crane or the like, similar to the first and second scaffolding blocks 21, 22.

[0046] When the third scaffolding block 23 is installed above the first scaffolding block 21, the site worker connects the frame 3 of the third scaffolding block 23 to the connecting members 8 of the gate-shaped supports 7 of the first scaffolding block 21 and the connecting members 10 of the diagonal members 9 on the first scaffolding block 21 (see Figure 7).

[0047] Then, the site worker performs the work of removing the wire W of the third scaffolding block 23 on the first scaffolding block 21. That is, the site worker reaches upward and removes the hook F engaged in the gap S of the wire support member 15. This separates the third scaffolding block 23 and the wire W.

[0048] In this case, too, the wire support member 15 is attached to the side wall portion 6 of the frame 3 of the third scaffolding block 23, so that the site worker can easily remove the wire W of the third scaffolding block 23 from the first scaffolding block 21 below the third scaffolding block 23. Therefore, unlike conventional construction methods, the site worker does not need to descend from the second scaffolding block 22 to the first scaffolding block 21 or ascend to the third scaffolding block 23.

[0049] Thereafter, although not shown, other scaffolding blocks 2 are similarly installed above the second scaffolding block 22 and the third scaffolding block 23, and the cavern facility scaffolding 1 is constructed.

[0050] In this way, in this embodiment, since the wire support member 15 is used to support the wire W so that it can be freely engaged, the work of removing the wire W can be performed on the lower scaffolding block 2, and unlike the conventional method, the site worker does not need to repeatedly climb up and down between the scaffolding blocks stacked one above the other. Therefore, it is possible to provide a construction method that improves the workability of the site worker.

[0051] Furthermore, since there is no need to climb up and down between the scaffolding blocks 2 as in conventional construction methods, the possibility of the site workers accidentally falling from the scaffolding blocks 2 can be minimized, providing a construction method with improved safety.

[0052] 8 to 10 are views showing modified examples of the wire mounting member. As shown in Figures 8 and 9, this wire support member 25 comprises a threaded, generally rod-shaped support bolt 26 and a generally annular movable retainer 28 that is threadably attached to one end of the support bolt 26 by a nut 27. A generally annular fixed retainer 29 is provided on the other end of the support bolt 26.

[0053] Two sets of wire support members 25 are used for each scaffolding block 2, and are attached respectively to the vicinity of one end and the other end of the frame 3. More specifically, as shown in Figure 10, one end of a support bolt 26 is inserted into the frame 3 from the outside of one side wall 6 of the frame 3, and protrudes from the other side wall 6. A movable latch 28 is screwed onto the other end of the protruding support bolt 26.

[0054] When the first scaffolding block 21 is lifted, a wire W is attached to each of the two sets of wire support members 25. That is, the hooks F of the two wires W are attached to the movable hook portions 28 and the fixed hook portions 29 of the wire support members 25 attached to the side wall portions 6 of the frame 3, respectively (see FIG. 10). Note that when the hooks F are removed after the scaffolding block 2 is installed, the wire support members 25 themselves may be removed from the first scaffolding block 21, or may remain attached as is.

[0055] The scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the wire support member 15 is attached to the frame 3 of the scaffolding block 2, but as long as the wire W can be removed from the lower scaffolding block 2, the attachment position of the wire support member 15 is not limited to the above-described embodiment. Furthermore, the scaffolding block 2 and wire support member 15 are not limited to the shapes, sizes, quantities, positional relationships, etc. of the above-described embodiment. [Explanation of symbols]

[0056] 1. Scaffolding for cavernous facilities 2 scaffolding blocks 3 frames 4 Work Platform 6 Side wall 7 Portal post 9 Diagonals 11 Handrail 14 Ladder members 15 Wire support member 16 U-shaped bolt section 17 Nut part 21 First Scaffolding Block 22 Second scaffolding block 23 Third Scaffolding Block B Bottom (of boiler furnace) W Wire

Claims

1. A method for constructing scaffolding for a cavernous facility by lifting a plurality of scaffolding blocks one by one with a wire, moving them through the air, and stacking and installing them for the cavernous facility having a cavity inside, comprising: A first step of installing at least a first scaffolding block at the bottom of the cavern facility; a second step of installing a second scaffolding block different from the first scaffolding block on top of the first scaffolding block; The first scaffold block and the second scaffold block are a work floor section where on-site workers perform work; and support columns extending in a height direction from both ends of the work floor section, The work floor section has: A wire support member is attached and used to support the wire so that it can be freely engaged when lifting the scaffolding block, The wire support member is a support bolt that can freely pass through a pair of side wall portions that are erected from the side end portions of the work platform portion and has a substantially annular fixed hook portion at one end; a substantially annular movable latch portion that is freely threadably attached to the other end of the support bolt, A method for constructing scaffolding for cavern facilities, characterized in that the wire is respectively attached to the fixed hook portion and the movable hook portion.

2. a third step of placing a third scaffold block different from the first scaffold block and the second scaffold block on top of the first scaffold block and at a position to the side of the second scaffold block; The third scaffolding block comprises: a work floor section where on-site workers perform work; and support columns extending in a height direction from both ends of the work floor section, The work floor section has:

2. The method for constructing a cavern facility scaffold according to claim 1, wherein a wire support member is attached to the scaffold block for supporting the wire so that it can be freely engaged when the scaffold block is lifted.

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