JP7768749B2 - Method for constructing scaffolding for cavernous facilities - Google Patents

Description

The present invention relates to a method for constructing scaffolding for use inside cavernous facilities, such as boiler furnaces in thermal power plants.

Conventionally, cavernous equipment, such as boiler furnaces at thermal power plants, is formed in the shape of a roughly hollow rectangular prism 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 Figure 11, is assembled and installed on this bottom B, and is used, for example, during maintenance such as repairs to the inside of the boiler furnace. Multiple cavernous equipment scaffolding 1 are installed at predetermined intervals along the length of the bottom B of the boiler furnace.

As shown in Figure 12, the cavern facility scaffolding 1 is made up of multiple stacked scaffolding blocks 2 (hereinafter, the scaffolding blocks will be referred to collectively as "2"). 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.

Here, as shown in Figure 13, for example, the first scaffolding block 21 is roughly composed of a frame 3 having a pair of side walls 6, a work platform 4 mounted on the frame 3, a pair of gate-shaped posts 7 extending vertically from both ends of the work platform 4, a pair of diagonal members 9, and a pair of handrails 11 mounted between the pair of gate-shaped posts 7.

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 location. More specifically, in the scaffolding block 2, two wires W routed under the work floor 4 (see Figures 13 and 14) are each hooked to a lifting member L, and the scaffolding block 2 is moved by lifting the lifting member L with a crane or the like.

JP 2014-201883 A

However, this conventional method of constructing scaffolding 1 for cavernous facilities involves stacking multiple scaffolding blocks 2 one on top of the other, which has the drawback of making it extremely difficult for on-site workers to work. In other words, with 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 attached to the lifting member L on that first scaffolding block 21.

Next, as shown in Figure 16, the second scaffolding block 22 is installed on top of the first scaffolding block 21. In this case, the site worker works on top of the first scaffolding block 21 to connect it to the second scaffolding block 22. For example, the worker connects the upper ends of the portal-shaped supports 7 and diagonal members 9 of the first scaffolding block 21 to the frame 3 of the second scaffolding block 22.

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 from above the second scaffolding block 22.

Then, as shown in Figure 17, a third scaffolding block 23 is placed above the first scaffolding block 21 and to the side of the second scaffolding block 22. In this case, the site worker must descend onto the first scaffolding block 21 again to connect the first scaffolding block 21 and the third scaffolding block 23 (see arrow T2).

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.

As such, in conventional construction methods, the wire W is routed under the work platform 4 and hung on the lifting member L, so the wire W must be removed from the scaffolding block 2. This requires on-site workers to repeatedly climb up and down between the scaffolding blocks 2 stacked vertically. This has the disadvantage of being extremely difficult to work with.

Furthermore, there was also the problem that if a site worker were to climb up and down between the scaffolding blocks 2, there was a risk of them accidentally falling, which was undesirable from a safety standpoint. 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 unsafe for a site worker to climb up and down the second scaffolding block 22 in this state.

The present invention was conceived in light of the above circumstances, and its objective is to provide a method for constructing scaffolding for cavern facilities that can improve the workability and safety of on-site workers.

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 wires, 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 are provided with a work floor section where workers perform work, and a front and support pillars extending in the height direction from both ends of the working floor section, and a wire support member is attached to the working floor section to support the wire so that it can be freely attached when lifting the scaffolding block , and the wire support member is capable of passing through a pair of side wall sections erected from the side ends of the working floor section, and is composed of a support bolt having an approximately annular fixed hanging section at one end, and an approximately annular movable hanging section that can be freely screwed onto the other end of the support bolt, and the wire is respectively attached to the fixed hanging section and the movable hanging section .

The method for constructing scaffolding for cavern 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 comprises a work floor section where workers perform work and support sections extending in the height direction from both ends of the work floor section, and the work floor section is preferably equipped with a wire support member attached to support the wire so that it can be freely attached when lifting the scaffolding block.

According to the present invention, a wire support member that supports a wire for lifting the scaffolding block in a freely attachable manner is attached to the work floor of the scaffolding block. Therefore, when installing a second scaffolding block on top of a first scaffolding block, on-site workers can easily detach the wire from the wire support member attached to the work floor of the second scaffolding block on the first scaffolding block. This eliminates the need for on-site workers to climb up and down between scaffolding blocks, as is the case with conventional construction methods, thereby improving the workability and safety of on-site workers.

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. 10A and 10B are diagrams showing a state in which a wire support member is attached to a frame. 10 is a diagram showing a state in which the wire support member is attached to the frame when not in use. FIG. FIG. 10 is a diagram showing the state in which the wire is attached to the scaffolding block. 10A and 10B are diagrams for explaining the procedure for installing scaffolding blocks. 10A and 10B are diagrams for explaining the procedure for installing scaffolding blocks. 10A and 10B are diagrams for explaining the procedure for installing scaffolding blocks. 10A and 10B show a support bolt of a modified wire support member, in which FIG. 10A is a left side view and FIG. 10A and 10B show a movable hook portion of a modified wire support member, in which FIG. 10A is a left side view and FIG. FIG. 10 is a diagram showing the state in which a wire is attached to a scaffolding block in a modified example. FIG. 1 is a schematic perspective view of a cavern facility. FIG. 12 is a schematic side view of a cavern facility scaffold installed in the cavern facility shown in FIG. 11 . FIG. 1 is a schematic perspective view showing the configuration of a conventional scaffolding block. FIG. 10 is a diagram showing how a wire is attached to a conventional scaffolding block. 10A and 10B are diagrams for explaining a conventional procedure for installing scaffolding blocks. 10A and 10B are diagrams for explaining a conventional procedure for installing scaffolding blocks. 10A and 10B are diagrams for explaining a conventional procedure for installing scaffolding blocks.

The following describes in detail the embodiments of the present invention with reference to the drawings.

In the following explanation, we will refer again to the figures referenced in the "Background Art" section. Also, the same components as those described in the "Background Art" section will be indicated by the same reference numerals.

The method for constructing scaffolding 1 for cavernous facilities according to this embodiment is applied to cavernous facilities such as boiler furnaces at thermal power plants. The overall structure of a boiler furnace at a thermal power plant is formed in the shape of a roughly hollow rectangular prism with an internal cavity, and its bottom B has a hopper structure that tapers downward, as shown in Figure 11.

As shown in Figure 12, the scaffolding 1 for cavernous equipment is made up of multiple stacked scaffolding blocks 2. The scaffolding 1 for cavernous equipment is composed 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, approximately symmetrically when viewed from the side, and three further scaffolding blocks installed on the layer above that, spreading out in the left-right direction.

Figure 1 is a schematic perspective view showing the configuration of the first scaffolding block 21. Note that the first scaffolding block 21 shown in Figure 1 is shown with a wire W attached for lifting it.

In the first scaffolding block 21, a roughly flat work platform 4 is provided on top of a frame 3 (not shown). The frame 3 consists of a main body 5 (see Figure 4) that is roughly rectangular in plan view, and a pair of side walls 6 erected 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 top surface.

A pair of gate-shaped posts 7 are provided at both ends of the frame 3, connecting the pair of side wall sections 6 and extending in the vertical direction. The pair of gate-shaped posts 7 are provided opposite each other at both ends of the frame 3. These gate-shaped posts 7 are intended to support 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 post 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.

A pair of diagonal members 9 are provided between the pair of portal posts 7, extending diagonally from the lower parts of the portal posts 7 along both side wall portions 6 of the frame 3 so as to approach each other and connected at their tips, forming a roughly mountain-like shape. The pair of diagonal members 9 are intended to support the second scaffolding block 22 or the third scaffolding block 23, which are placed on top of the first scaffolding block 21. A connecting member 10, which is roughly U-shaped in side view, is provided at the end connection portion of each of the pair of diagonal members 9 to connect them.

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

A jack bolt 12 extending in the height direction is attached to each of the four ends of the frame 3, and a roughly flat jack base 13 is attached to the lower end of each jack bolt 12. The jack base 13 is tilted diagonally to support the first scaffolding block 21 along the sloped bottom B.

A pair of ladder members 14 extending diagonally are provided at both ends of the frame 3. Each ladder member 14 is intended to support 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.

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

Two wire support members 15 are attached near one end and two near the other end of the frame 3. More specifically, as shown in Figure 4, the tip of a U-shaped bolt 16 is inserted from the outside of the frame 3 into two through holes 6a (see the circle in Figure 1) formed in one side wall 6 of the frame 3, and a nut 17 is screwed into the inside of the side wall 6. A wire support member 15 is attached in a similar configuration to the other side wall 6 of the frame 3.

When lifting the first scaffolding block 21, a wire W is attached to each of the four wire support members 15. That is, the hooks F of the two wires W are attached 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).

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 into the inside of the side wall portion 6 of the frame 3, as shown in Figure 3, so that no gap S is formed.

The two wires W are hung from the lifting member L, which is then lifted and moved by a crane or similar device, thereby moving the first scaffolding block 21 and installing it in the desired position.

The second scaffolding block 22 and the third scaffolding block 23 are configured in a manner similar to the first scaffolding block 21, but because the third scaffolding block 23 is installed to the right 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. Also, because the second scaffolding block 22 is installed to the left 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 because 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.

Next, we will explain the procedure for installing the scaffolding blocks 2 in the method for constructing the cavern facility scaffolding 1 of the present invention.

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

Once the first scaffolding block 21 has been installed, the on-site worker removes the wire W that is attached to the lifting member L on the first scaffolding block 21 (see Figure 5). That is, the worker removes the hook F that is attached to the wire support member 15 attached to the side wall 6 of the frame 3. This separates the first scaffolding block 21 from the wire W.

Next, the second scaffolding block 22 is assembled, for example, on the ground, and, similar to the first scaffolding block 21, the wire support member 15 is attached and the hook F of the wire W is attached to the gap S. The second scaffolding block 22 is then lifted by a crane or other device using the 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.

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 to the connecting members 8 of the portal posts 7 and the connecting members 10 of the diagonal members 9 of the first scaffolding block 21 (see Figure 6).

Then, the site worker removes the wire W that is attached to 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.

In this way, because the wire support member 15 is attached to the side wall portion 6 of the frame 3, on-site workers can easily remove the wire W from the second scaffolding block 22 while standing on the first scaffolding block 21 below the second scaffolding block 22. Therefore, as with conventional construction methods, on-site workers do not need to climb from the first scaffolding block 21 to the second scaffolding block 22.

Next, a third scaffolding block 23, assembled, for example, on the ground, is placed above the first scaffolding block 21 and to the side of the second scaffolding block 22. In this case, as with the first and second scaffolding blocks 21 and 22, the third scaffolding block 23 is lifted by a crane or the like and moved through the air using a lifting member L.

Once 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 portal posts 7 and the connecting members 10 of the diagonal members 9 of the first scaffolding block 21 (see Figure 7).

Then, the site worker, standing on the first scaffolding block 21, removes the wire W from the third scaffolding block 23. 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 third scaffolding block 23 from the wire W.

In this case, too, the wire support member 15 is attached to the side wall 6 of the frame 3 of the third scaffolding block 23, so site workers can easily remove the wire W from the third scaffolding block 23 while standing on the first scaffolding block 21 below the third scaffolding block 23. Therefore, as with conventional construction methods, site workers do not need to descend from the second scaffolding block 22 to the first scaffolding block 21 or ascend to the third scaffolding block 23.

Then, although not shown, other scaffolding blocks 2 are installed in the same manner above the second scaffolding block 22 and the third scaffolding block 23, and the cavern equipment scaffolding 1 is constructed.

In this way, in this embodiment, the wire support member 15 is used to support the wire W so that it can be freely attached. This allows the wire W to be removed from the lower scaffolding block 2, eliminating the need for on-site workers to repeatedly climb up and down between scaffolding blocks stacked one above the other, as is the case with conventional methods. This provides a construction method that improves the workability of on-site workers.

In addition, because there is no need to climb up and down between scaffolding blocks 2 as in conventional construction methods, the possibility of on-site workers accidentally falling from the scaffolding blocks 2 is minimized, providing a construction method with improved safety.

Figures 8 to 10 show modified examples of the wire mounting member. As shown in Figures 8 and 9, this wire support member 25 consists of a threaded, generally rod-shaped support bolt 26 and a generally annular movable retaining portion 28 that is threadably attached to one end of the support bolt 26 by a nut portion 27. A generally annular fixed retaining portion 29 is provided at the other end of the support bolt 26.

Two sets of wire support members 25 are used for each scaffolding block 2, and are attached near one end and the other end of the frame 3, respectively. 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.

When lifting the first scaffolding block 21, 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 and fixed hook portions 28 and 29 of the wire support members 25 attached to the side wall portions 6 of the frame 3 (see Figure 10). Note that if 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.

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. However, 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 shape, size, quantity, positional relationship, etc. of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Scaffolding for cavern equipment 2 Scaffolding block 3 Frame 4 Working floor 6 Side wall 7 Gate-shaped support 9 Diagonal member 11 Handrail 14 Ladder member 15 Wire support member 16 U-shaped bolt portion 17 Nut portion 21 First scaffolding block 22 Second scaffolding block 23 Third scaffolding block B Bottom (of boiler furnace)
W Wire

Claims (2)

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 a scaffold for a cavern facility, characterized in that the wire is respectively attached to the fixed hook portion and the movable hook portion . 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.