Method for dismantling columnar structures

Abstract

To provide a hollow columnar structure demolition method without requiring installation of a heavy machine at a high place like apex of the hollow columnar structure such as chimney or a tall heavy machine reaching the high place.SOLUTION: When a columnar structure is demolished by cutting part by part from a top end thereof, the columnar structure is demolished by repeating a step to install a bracket on an outer wall surface of the columnar structure, install an assembly stand on the bracket, cut a part of the columnar structure while locking the part by a lifting machine fitted to the assembly stand, and lower the cut part. During the step, installation positions of the bracket and the assembly stand are lowered as the top end part of the columnar structure becomes lower by being repeatedly cut.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present invention relates to the demolition of hollow columnar structures such as chimneys.

Background Art

[0002] Patent Document 1 discloses a chimney demolition system for demolishing chimneys. This chimney demolition system is a system in which a crushing work vehicle is suspended from a wire rope hung from the top of the chimney, and a part of the top of the chimney is crushed using the crushing work vehicle. A pulley is provided on a part of the wall surface at the top of the chimney, a crushing work vehicle is connected to one end of a wire extending downward from the pulley, and the other end of the wire is connected to the bottom of the chimney. The crushing work vehicle crushes, by means of a crushing means at the end of an arm, a region on the opposite side radially opposite to the side where the pulley is installed on the wall surface at the top of the chimney.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] The demolition system of Patent Document 1 has the problem that it is necessary to install heavy machinery such as a crushing work vehicle at a high place such as the top of a chimney, which takes time for work and involves danger. On the other hand, there are problems that there are only a small number of tall heavy machineries that can reach high places, and it takes time and costs to arrange them.

[0005] Therefore, an object of the present invention is to provide a demolition method for a hollow columnar structure that does not require installing heavy machinery at a high place such as the top of the hollow columnar structure such as a chimney, nor does it require tall heavy machinery that can reach high places.

Means for Solving the Problem

[0006] One aspect of the present invention is a method for dismantling a columnar structure, comprising: an assembled frame including a lower frame placed on brackets provided on the outer wall surface of the columnar structure, and an upper frame supported by columns provided on the lower frame and located above the lower frame; and a lifting machine equipped with a wire and a suspension part provided on the wire, attached to the upper frame, wherein the wall surface of the columnar structure is cut off in sections from the top end, the method comprising: a bracket installation step of horizontally arranging and installing a plurality of the brackets on the outer wall surface of the columnar structure; and the lower frame being placed on the plurality of brackets installed in the bracket installation step The process involves repeatedly performing the following steps in order: an assembly frame installation step of installing an assembly frame; a locking step of locking the lifting part of the lifting machine attached to the upper frame to the suspended part provided on the outer wall surface; a cutting step of cutting a part of the wall surface so as to include the upper end of the wall surface and the suspended part; and a lowering step of lowering the part of the wall surface cut in the cutting step using the lifting machine equipped with the lifting part locked to the suspended part included in the part of the wall surface. When repeating the process multiple times, in the second and subsequent bracket installation steps, multiple brackets are newly installed horizontally in a position lower than the position of the bracket installed in the previous bracket installation step. In the assembly frame installation process performed for the second time or later when the process is repeated multiple times, the lower frame installed in the previous assembly frame installation process is made the upper frame of the new assembly frame, the lower frame of the new assembly frame is newly installed on the multiple brackets newly installed in the bracket installation process, the support columns of the new assembly frame are attached to the lower frame of the new assembly frame, the upper frame of the new assembly frame is supported by the support columns of the new assembly frame, the lifting machine attached to the upper frame of the assembly frame installed in the previous assembly frame installation process is moved to the upper frame of the new assembly frame, and the upper frame and support columns of the assembly frame installed in the previous assembly frame installation process are removed. It is characterized by the following: [Effects of the Invention]

[0009] When dismantling a hollow, erected columnar structure by cutting it piece by piece from the top of its wall, brackets are installed on the outer wall surface of the columnar structure. An assembly frame with a lifting machine is then installed on these brackets. The cutting portion at the top of the wall is supported by the lifting machine, and the cutting portion is repeatedly cut and lowered. This method eliminates the need to install heavy machinery at high altitudes or to use tall heavy machinery capable of reaching high places. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front view of the chimney 1 according to this embodiment. [Figure 2] This is a front view of the chimney 1 according to this embodiment. [Figure 3] (A) is a front view of the chimney 1 according to this embodiment, and (B)-(E) are plan views of the chimney 1 according to this embodiment. [Figure 4] This is a front view of the chimney 1 according to this embodiment. [Figure 5] This is a front view of the chimney 1 according to this embodiment. [Figure 6] This diagram shows a flowchart illustrating the method for disassembling the inner cylinder 2 according to this embodiment. [Figure 7] This is a plan view of the outer cylinder 3 according to this embodiment. [Figure 8] (A) is a front view of the upper end of the outer cylinder 3 according to this embodiment, (B) is a view of the outer cylinder 3 according to this embodiment as indicated by arrow AA in Figure 8(A), and (C) is a view of the outer cylinder 3 according to this embodiment as indicated by arrow BB in Figure 8(A). [Figure 9] (A) is a front view of the upper end of the outer cylinder 3 according to this embodiment, (B) is a plan view of the outer cylinder 3 according to this embodiment, and (C) is a side view of the upper end of the outer cylinder 3 as seen while rotating around the outer cylinder 3. [Figure 10] (A) is a front view of the upper end of the outer cylinder 3 according to this embodiment, (B) is a view of the outer cylinder 3 according to this embodiment as indicated by arrow AA in Figure 10(A), and (C) is a view of the outer cylinder 3 according to this embodiment as indicated by arrow BB in Figure 10(A). [Figure 11] (A) is a front view of the upper end of the outer cylinder 3 according to this embodiment, (B) is a plan view of the outer cylinder 3 according to this embodiment, and (C) is a side view of the upper end of the outer cylinder 3 as seen while rotating around the outer cylinder 3. [Figure 12] This is a front view of the outer cylinder 3 according to this embodiment. [Figure 13] This is a front view of the outer cylinder 3 according to this embodiment. [Figure 14] This is a front view of the outer cylinder 3 after disassembly according to this embodiment. [Figure 15] This diagram shows a flowchart of the first dismantling method for the outer cylinder 3 according to this embodiment. [Figure 16]It is a diagram showing a flowchart of a second dismantling method for the outer cylinder 3 according to the present embodiment. [Figure 17] (A) is a side view of the bracket 52 attached to the outer cylinder 3 according to the present embodiment, (B) is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment, (C) is a view taken along line A-A in FIG. 17(B) of the outer cylinder 3 according to the present embodiment, and (D) is a view taken along line B-B in FIG. 17(B) of the outer cylinder 3 according to the present embodiment. [Figure 18] is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment. [Figure 19] (A) is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment, and (B) is a view taken along line A-A in FIG. 19(A) of the outer cylinder 3 according to the present embodiment. [Figure 20] (A) is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment, (B) is a view taken along line A-A in FIG. 20(A) of the outer cylinder 3 according to the present embodiment, and (C) is a view taken along line B-B in FIG. 20(A) of the outer cylinder 3 according to the present embodiment. [Figure 21] is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment. [Figure 22] is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment. [Figure 23] is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment. [Figure 24] is a front view of the upper end portion of the outer cylinder 3 according to the present embodiment. [Figure 25] (A)-(G) are transition diagrams showing an operation example of the jack 20 according to the present embodiment. Mode for Carrying Out the Invention

[0011] Embodiments according to the present invention will be described with reference to the drawings.

[0012] The following describes the dismantling of a double-walled chimney 1, which includes an outer cylinder 3 and an inner cylinder 2 located inside the outer cylinder 3, as shown in Figure 1. The outer cylinder 3 is a hollow cylindrical structure with reinforced concrete walls, approximately 120m high and weighing approximately 2300 tons. The wall thickness is 200-550mm. The inner cylinder 2 has an exhaust section 2a for discharging smoke, a guide section 2b for taking in exhaust smoke discharged from thermal power plants and other sources and guiding it to the exhaust section 2a, and an IDF (Induced Draft Fan) 2c for drawing the smoke taken in by the guide section 2b into the exhaust section 2a. The inner cylinder 2 weighs approximately 100 tons and has a wall thickness of 12-16mm. The chimney 1 is erected on a foundation 4.

[0013] In this embodiment, a jack-type lifting machine 20 (hereinafter sometimes referred to as "jack 20") shown in Figure 25 is used. The jack 20 has a wire W and an anchor 25 attached to the wire W. By lifting or lowering the wire W while the anchor 25 is locked to the part to be lifted, such as a hook or lifting piece provided on the object to be lifted, the object to be lifted can be raised or lowered. The specific operation of the jack 20 will be described later.

[0014] [1. Disassembly method for inner cylinder 2] First, the method for dismantling the inner cylinder 2 will be explained with reference to Figures 2-6. In this embodiment, the case in which the inner cylinder 2 has a discharge section 2a, a guide section 2b, and an IDF 2c will be described, but this dismantling method can also be applied to other columnar structures (for example, a structure in which the discharge section 2a extends from the top to the bottom). The following explanation will follow the flowchart in Figure 6.

[0015] [1.1. Installation process of mobile lifting scaffolding (Step S11)] As shown in Figure 2, a movable lifting scaffolding consisting of a mast 10 and scaffolding 11 that moves up and down guided by the mast 10 is assembled along the outer wall surface of the outer cylinder 3. The mast 10 has a height from the ground to near the top of the chimney 1, and the scaffolding is circular in shape when viewed from above and moves up and down along the outer circumference of the outer cylinder 3. This allows materials such as beams and jacks 20 used for demolition, as well as workers, to be moved up and down along the chimney 1, and for example, workers can attach or detach brackets 52, which will be described later, at any height on the outer wall surface of the outer cylinder 3.

[0016] [1.2. Jack installation process (Step S12)] As shown in Figure 3(B), the chimney 1, when viewed from above, has a double wall structure consisting of an inner cylinder 2 and an outer cylinder 3. In this process, the scaffolding 11 is raised to the upper end of the chimney 1 by placing jacks 20, load-receiving beams 17 and jack-fixing beams 18 on the ground.

[0017] Next, a bracket crane (not shown) installed on the scaffolding 11 is used to install the load-bearing beams 17 on the wall surface of the outer cylinder 3. Specifically, for example, as shown in Figure 3(B), when the circular wall surface of the outer cylinder 3 in a plan view is divided into four sections by dotted lines, two load-bearing beams 17 are placed in each section parallel to the tangent line that touches the center of the arc created by dividing the circular outer cylinder 3 into four sections, as shown in Figure 3(C). Note that the number of divisions of the circular wall surface of the outer cylinder 3 is not limited to "4" and may be other numbers. Also, the number of load-bearing beams 17 placed in each section is not limited to "2" and may be other numbers.

[0018] Next, as shown in Figure 3(D), two jack fixing beams 18 are erected on the load-bearing beams 17 in adjacent areas, for a total of four locations. The jack fixing beams 18 are erected in such a way that when the jacks 20 are fixed to the jack fixing beams 18, the anchors 25 (an example of a "suspension part") provided at the end of the wire W extending downward from the jacks 20 can be locked to the suspension pieces provided on the wall surface of the outer cylinder 3. Note that the number of jack fixing beams 18 erected on the load-bearing beams 17 in adjacent areas is not limited to "2" and may be any other number.

[0019] Next, as shown in Figures 3(A) and (E), two jacks 20 are fixed to each of the four jack fixing beams 18, for a total of eight jacks. Note that the number of jacks 20 fixed to the jack fixing beams 18 is not limited to "2" and may be other numbers. The number of jacks 20 to be installed is calculated based on the mass of the inner cylinder 2 to be lifted and the rated load of the jacks 20 (15 tons in this embodiment). Furthermore, it is preferable to arrange the jacks 20 so that the load is evenly distributed among them.

[0020] This process allows the jack 20 to be installed so that the load is applied to the wall surface of the outer cylinder 3.

[0021] [1.3. Locking process (Step S13)] In this process, workers use existing scaffolding along the discharge section 2a of the inner cylinder 2 to attach suspension pieces to the outer wall surface of the discharge section 2a for securing the anchors 25 of the jacks 20. The suspension positions of the suspension pieces are below each jack 20 installed in the jack installation process. Furthermore, the height of the suspension pieces should be close to the upper end of the inner cylinder 2, as placing them lower than the center of gravity of the inner cylinder 2 would make it unstable when the inner cylinder 2 is suspended by the jacks 20. Alternatively, the suspension pieces may be installed on the inner cylinder 2 before its demolition, such as during its construction, thus eliminating the need to attach them during demolition.

[0022] Next, the anchor 25 of the jack 20 is secured to the suspension piece. This procedure is performed for each jack 20. With the anchor 25 of the jack 20 secured to the suspension piece, the wire is pulled up and tensioned, allowing the load of the inner cylinder 2 to be supported by the jack 20.

[0023] [1.4. Opening Process (Step S14)] In this process, as shown in Figure 4, an opening 3a is made in the lower wall surface of the outer cylinder 3 using a cutting machine (not shown).

[0024] [1.5. Cutting Process (Step S15)] In this process, with the load of the inner cylinder 2 supported by the jack 20, the lower part of the inner cylinder 2 (IDF2c in Figure 4) is cut (and / or crushed) by a cutting machine. For example, the lower end of the inner cylinder 2 is cut by about 2m. As a result, the inner cylinder 2 is suspended in mid-air by the jack 20.

[0025] [1.6. Removal Process (Step S16)] In this process, the rubble created by the cutting process is removed from the outer cylinder 3 through the opening 3a.

[0026] [1.7. Lowering process (Step S17)] In this process, as shown in Figure 5, the wire W of the jack 20 is lowered (jacked down), causing the lower end of the suspended inner cylinder 2 to the ground or near the ground.

[0027] [1.8. Judgment Process (Step S18)] In this step, it is determined whether or not the inner cylinder 2 can be removed from the opening 3a. If the inner cylinder 2 can be removed from the opening 3a (step S18: YES), the process proceeds to step S19. On the other hand, if the inner cylinder 2 cannot be removed from the opening 3a (step S18: NO), the process proceeds to step S15.

[0028] In other words, the cutting process (step S15), removal process (step S16), and lowering process (step S17) are repeated until the remaining portion of the inner cylinder 2 is small enough to be removed from the opening 3a, and the inner cylinder 2 is cut from the lower end. During the repeated cutting process, for example, the lower end of the inner cylinder 2 is cut (and / or crushed) to a length of about 2m, and in the subsequent removal process, a portion of the cut inner cylinder 2 is removed to the outside of the outer cylinder 3.

[0029] [1.9. Final removal process (Step S19)] In this step, the remaining portion of the inner cylinder 2 is removed through the opening 3a. Once this step is complete, the dismantling method for the inner cylinder 2 is finished.

[0030] As described above, the method for dismantling the inner cylinder 2 of this embodiment is a method for dismantling the inner cylinder 2 (an example of an "inner columnar structure") in a chimney 1 (an example of a "double structure") in which an inner cylinder 2 and an outer cylinder 3 (an example of "two hollow columnar structures") are erected in a double-layered structure, and comprises a jack installation step (an example of an "installation step") in which a jack 20 (an example of a "lifting machine") equipped with a wire W and an anchor 25 (an example of a "lifting part") provided on the wire W is installed at the upper end of the outer cylinder 3 (an example of an "outer columnar structure"), and provided on the wall surface of the inner cylinder 2 The process includes a locking step of locking the anchor 25 of the jack 20 to a suspension piece (an example of a "suspended part"), a cutting step of cutting the lower end of the inner cylinder 2 through an opening formed in the lower part of the outer cylinder 3 while the load of the inner cylinder 2 is supported by the jack 20, a removal step of removing the rubble created by the cutting step from the outer cylinder 3 through the opening 3a, and a lowering step of lowering the inner cylinder 2 with the jack 20. The jack installation step, locking step, cutting step, removal step, and lowering step are performed in order, and then the cutting step, removal step, and lowering step are repeated in order.

[0031] Therefore, according to the method for dismantling the inner cylinder 2 of this embodiment, the inner cylinder 2 is dismantled by repeatedly cutting the lower end of the inner cylinder 2 and lowering the inner cylinder 2 while the load of the inner cylinder 2 is supported by a jack 20 installed at the upper end of the outer cylinder 3 erected outside the inner cylinder 2. This eliminates the need to perform cutting or crushing work at high places such as the upper end of the inner cylinder 2, and prevents debris generated by cutting or crushing from falling.

[0032] [2. Disassembly method for outer cylinder 3] Next, the method for dismantling the outer cylinder 3 will be described. In this embodiment, the method for dismantling the outer cylinder 3 in a chimney 1 consisting of an inner cylinder 2 and an outer cylinder 3 will be described, but the dismantling method described below can also be applied to a single hollow columnar structure such as an outer cylinder 3 that does not have an inner cylinder 2.

[0033] Below, we will explain the first and second methods for dismantling the outer cylinder 3.

[0034] [2.1. First method of disassembling the outer cylinder 3] Referring to Figures 7-15, the first method of dismantling the outer cylinder 3 will be explained. Figure 7 is a diagram showing the wall surface of the outer cylinder 3 in plan view. In the first dismantling method, the wall surface of the outer cylinder 3 is divided into a first region and a second region, with the first and second regions alternating, and the installation locations of the load-receiving beams 31 and fixed beams 33, which will be described later, are determined. In this embodiment, the first region and the second region are divided into four locations each, but it is sufficient to have at least one of each. The following explanation will follow the flowchart in Figure 15.

[0035] [2.1.1. First erection process (Step S31)] In this process, as shown in Figures 8(A) and (B), load-bearing beams 31 are erected on the wall surface of the outer cylinder 3 (the wall surface of the outer cylinder 3 may be indicated by the symbol "3") corresponding to the first region (see Figure 7). The load-bearing beams 31 have a grid shape and receive loads from the fixed beams 33, jacks 20, etc., which are installed on top of the load-bearing beams 31. In this embodiment, since there are four first regions, the load-bearing beams 31 are erected in a grid shape, but the number of load-bearing beams 31 is adjusted according to the number of first regions. If there is only one first region, for example, load-bearing beams 31 are erected from one end of the first region to the other.

[0036] [2.1.2. First Installation Process (Step S32)] In this process, a fixed beam 33 to which the jack 20 is fixed is installed relative to the load-receiving beam 31. At this time, as shown in Figures 8(A) and (C), the fixed beam 33 is installed so that the jack 20 is positioned in a location (an example of the "first position") in which the anchor 25 of the jack 20 can be locked to a suspension piece, which will be described later, provided on the wall surface 3 of the second region.

[0037] [2.1.3. First fixing process (Step S33)] In this process, as shown in Figures 8(A)-(C), the jacks 20 are fixed to the fixed beam 33 and positioned so that the anchors 25 of the jacks 20 can be locked to the suspension piece. This positions the jacks 20 in the second region of the wall surface 3 in plan view. In this embodiment, four jacks 20 are used.

[0038] [2.1.4. First locking process (step S34)] In this process, first, a hole is made in the wall surface 3 of the second region, below the jack 20 located in the second region, and a suspension piece is attached to the hole on the inside of the wall surface 3. The preferred attachment position of the suspension piece is in the center or above the cutting portion 3p (the mesh pattern portion in Figure 9(A)) of the wall surface 3, which will be cut in the first cutting process described later, as shown in Figures 9(A) and (B). The range of the cutting portion 3p extends downward from the upper end of the wall surface 3 of the second region and includes the attachment position of the suspension piece. The lower limit of the range of the cutting portion 3p is set based on the mass of the cutting portion 3p and the rated load of the jack 20, etc. In this embodiment, four suspension pieces are provided. The suspension pieces may be installed in the outer cylinder 3 before dismantling the outer cylinder 3, such as during the construction of the outer cylinder 3, to eliminate the need to attach the suspension pieces during dismantling.

[0039] Next, the anchor 25 of the jack 20, which is positioned to be able to be locked to the suspension piece, is locked to the suspension piece provided on the wall surface 3 of the second region. As a result, when the cutting portion 3p is cut in the first cutting process described later, the cutting portion 3p will not fall because it is connected to the jack 20.

[0040] [2.1.5. First Cutting Process (Step S35)] In this process, the wall surface 3 is cut by a cutting machine at the upper end of the wall surface 3 in the second region described above and at the cutting portion 3p which includes the suspension piece. In this embodiment, four cutting portions 3p are cut.

[0041] [2.1.6. First descent process (Step S36)] In this process, the cut portion 3p, which was cut in the first cutting process, is lowered by a jack 20 equipped with an anchor 25 that is locked to a suspension piece included in the cut portion 3p. In this embodiment, four cut portions 3p are lowered. The cut portions 3p can be lowered either inside or outside the outer cylinder 3, but lowering them inside prevents damage to the outside of the outer cylinder 3, as the cut portion 3p will fall inside the outer cylinder 3 if the anchor 25 comes off the suspension piece.

[0042] [2.1.7. First removal process (Step S37)] In this process, the jack 20 is removed from the fixed beam 33, and the fixed beam 33, which was fixed in the first fixing process, is removed from the load-bearing beam 31.

[0043] [2.1.8. First Removal Process (Step S38)] In this process, the load-bearing beam 31 erected in the first erection process is removed from the wall surface 3 corresponding to the first area.

[0044] As explained above, by performing the first erection process and the first removal process, the outer cylinder 3 will be in a state where the cut portion 3p shown in Figure 9(A) has been eliminated. In other words, when viewing the upper end of the outer cylinder 3 from the side while walking around it, it will have a rectangular wave shape as shown in Figure 9(C) (the second region of the outer cylinder 3 will be concave, and the first region of the outer cylinder 3 will be convex).

[0045] [2.1.9. Second Erection Process (Step S39)] In this process, as shown in Figures 10(A) and (B), load-bearing beams 31 are erected on the wall surface of the outer cylinder 3 corresponding to the second region (see Figure 7) (in the concave portion in Figure 9(C)). The load-bearing beams 31 have a grid shape and receive loads from the fixed beams 33, jacks 20, etc., which are installed on top of the load-bearing beams 31. In this embodiment, since there are four second regions, the load-bearing beams 31 are erected in a grid shape, but the number of load-bearing beams 31 is adjusted according to the number of second regions. If there is only one second region, for example, load-bearing beams 31 are erected from one end of the second region to the other.

[0046] [2.1.10. Second Installation Process (Step S40)] In this process, as shown in Figures 10(A) and (C), a fixed beam 33 to which the jack 20 is fixed is installed on the load-receiving beam 31 such that the jack 20 is positioned on the wall surface 3 of the second region at a location (an example of the "second position") where the anchor 25 of the jack 20 can be locked to a suspension piece provided on the wall surface 3 of the second region.

[0047] [2.1.11. Second fixing process (Step S41)] In this process, as shown in Figures 10(A)-(C), the jacks 20 are fixed to the fixed beam 33 and positioned so that the anchors 25 of the jacks 20 can be locked to the suspension piece. This positions the jacks 20 in the first region of the wall surface 3 in plan view. In this embodiment, four jacks 20 are used.

[0048] [2.1.12. Second locking process (step S42)] In this process, first, a hole is drilled in the wall surface 3 of the first region, below the jack 20 located in the first region, and a suspension piece is attached to the hole. The preferred attachment position of the suspension piece is in the center or above the cutting portion 3q (the mesh pattern portion in Figure 11(A)) of the wall surface 3, which will be cut in the second cutting process described later, as shown in Figures 11(A) and (B). The range of the cutting portion 3q extends downward from the upper end of the wall surface 3 of the first region and includes the attachment position of the suspension piece. The lower limit of the range of the cutting portion 3q is set based on the mass of the cutting portion 3q and the rated load of the jack 20, etc. In this embodiment, four suspension pieces are provided. The suspension pieces may be installed on the outer cylinder 3 before dismantling the outer cylinder 3, such as during the construction of the outer cylinder 3, to eliminate the need to attach the suspension pieces during dismantling.

[0049] Next, the anchor 25 of the jack 20, which is positioned to be able to be locked to the suspension piece, is locked to the suspension piece provided on the wall surface 3 of the first region. As a result, when the cutting portion 3q is cut in the second cutting process described later, the cutting portion 3q will not fall because it is connected to the jack 20.

[0050] [2.1.13. Second cutting process (Step S43)] In this process, the cutting machine cuts the upper end of the wall surface 3 of the first region described above and the cutting portion 3q including the suspension piece. In this embodiment, four cutting portions 3q are cut.

[0051] [2.1.14. Second descent process (Step S44)] In this process, the cut portion 3q, which was cut in the second cutting process, is lowered by a jack 20 equipped with an anchor 25 that is locked to a suspension piece included in the cut portion 3q. In this embodiment, four cut portions 3q are lowered. The cut portions 3q can be lowered either inside or outside the outer cylinder 3, but lowering them inside prevents damage to the outside of the outer cylinder 3, as the cut portion 3q will fall inside the outer cylinder 3 if the anchor 25 comes off the suspension piece.

[0052] [2.1.15. Second removal process (step S45)] In this process, the jack 20 is removed from the fixed beam 33, and the fixed beam 33, which was fixed in the second fixing process, is removed from the load-bearing beam 31.

[0053] [2.1.16. Second Removal Process (Step S46)] In this process, the load-bearing beam 31 that was erected in the second erection process is removed from the wall surface 3 corresponding to the second area.

[0054] As explained above, by performing the second erection process and the second removal process, the outer cylinder 3 will be in a state where the cut portion 3q in Figure 11(A) has been eliminated. In other words, the first region of the outer cylinder 3 will be concave, and the second region of the outer cylinder 3 will be convex, and when the upper end of the outer cylinder 3 is viewed from the side while rotating around the outer cylinder 3, it will have a rectangular wave shape (the first region of the outer cylinder 3 will be concave, and the second region of the outer cylinder 3 will be convex).

[0055] [2.1.17. First determination process (Step S47)] In this step, a determination is made as to whether the outer cylinder 3 can be dismantled by the heavy machinery J on the ground. That is, it is determined whether the height of the outer cylinder 3 at that time is such that it can be dismantled by the heavy machinery J on the ground. If it can be dismantled by the heavy machinery J on the ground (step S47: YES), the process proceeds to step S51. On the other hand, if it cannot be dismantled by the heavy machinery J on the ground (step S47: NO), the process proceeds to step S48.

[0056] [2.1.18. First process group repeating process (step S48)] In this process, the first group of processes, consisting of the first erection process, first installation process, first fixing process, first locking process, first cutting process, first lowering process, first removal process, and the first demolition process, is repeated once more, and then the process moves to step S49. The lower limit of the range of the cut portion 3n (the "cut portion" of the wall surface 3 is generally denoted as 3n) is such that, for example, in the first cutting process, the wall surface 3 is cut so that the mass of the cut portion 3n is approximately 35% of the rated load of the jack 20, and in the second and subsequent first cutting processes and the first and subsequent second cutting processes, the wall surface 3 is cut so that the mass of the cut portion 3n is approximately 70% of the rated load of the jack 20. As a result, the upper end of the outer cylinder 3 alternates between a state where the first region is convex and the second region is concave (see Figure 9(C)) and a state where the first region is concave and the second region is convex (see Figure 11(C)). This allows for the repeated operation of placing the jack 20 in the concave portion and cutting the convex portion.

[0057] [2.1.19. Second determination process (Step S49)] In this step, the same determination as in the first determination step is made. If the demolition can be done with the heavy machinery J on the ground (step S49: YES), proceed to step S51. On the other hand, if the demolition cannot be done with the heavy machinery J on the ground (step S49: NO), proceed to step S50.

[0058] [2.1.20. Second process group repeating process (step S50)] In this process, the second group of processes, consisting of the second erection process, second installation process, second fixing process, second locking process, second cutting process, second lowering process, second removal process, and second demolition process, is repeated once more, and then the process moves to step S47.

[0059] In other words, after step S46, the first and second process groups are repeated alternately until the outer cylinder 3 is at a height that can be dismantled by heavy machinery J on the ground (for example, about 20m), and the outer cylinder 3 is cut from the top end.

[0060] [2.1.21. Residual Disposal Process (Step S51)] In this step, as shown in Figure 13, the remaining portion of the outer cylinder 3 is dismantled by heavy machinery J on the ground. Once this step is complete, as shown in Figure 14, the outer cylinder 3 is dismantled, and the dismantling method for the outer cylinder 3 is finished.

[0061] As described above, the first method of dismantling the outer cylinder 3 of this embodiment is a method of dismantling the outer cylinder 3 by cutting off parts of the outer cylinder 3 (an example of an erected hollow columnar structure) from the upper end of its wall surface using a jack 20 (an example of a lifting machine) equipped with a wire W and an anchor 25 (an example of a "suspension part") provided on the wire W, and comprising a first erection step of erecting a load-receiving beam 31 on the wall surface corresponding to the first region when the wall surface of the outer cylinder 3 viewed in plan is divided into a first region and a second region with the first and second regions alternating, and the jack 20 is provided on the wall surface of the second region A first installation step involves installing a fixed beam 33 on a load-receiving beam 31 such that the jack 20 is fixed to it in a first position where the anchor 25 can be locked to the suspension piece (an example of the "suspended part"), a first fixing step involves fixing the jack 20 to the fixed beam 33 and positioning it in a first position, a first locking step involves locking the anchor 25 of the jack 20 fixed in the first position to the suspension piece provided on the wall surface of the second region, a first cutting step involves cutting a cut portion 3p (an example of "part of the wall surface") so as to include the upper end of the wall surface of the second region and the suspension piece, and the cut portion of the second region cut in the first cutting step The process includes a first lowering step of lowering section 3p using a jack 20 equipped with an anchor 25 locked to a suspension piece included in the cut section 3p, a first removal step of removing the fixed beam 33 from the load-bearing beam 31, a first removal step of removing the load-bearing beam 31 from the wall surface corresponding to the first region, a second erection step of erecting the load-bearing beam 31 on the wall surface corresponding to the second region, and a second installation step of installing the fixed beam 33 to which the jack 20 is fixed on the load-bearing beam 31 so that the jack 20 is positioned in a second position where the anchor 25 can be locked to a suspension piece provided on the wall surface of the first region, and the jack A second fixing step of fixing the jack 20 to the fixed beam 33 and positioning it in a second position; a second locking step of locking the anchor 25 of the jack 20 fixed in the second position to a suspension piece provided on the wall surface of the first region; a second cutting step of cutting a cut portion 3q (an example of "part of the wall surface") so as to include the upper end of the wall surface of the first region and the suspension piece; a lowering step of lowering the cut portion 3q of the first region cut in the second cutting step using the jack 20 equipped with an anchor 25 locked to a suspension piece included in the part of the wall surface; and a second removal step of removing the fixed beam 33 from the load-receiving beam 31.The process includes a second removal step of removing the load-bearing beam 31 from the wall surface corresponding to the second region, and alternately repeats a first group of steps consisting of a first erection step, a first installation step, a first fixing step, a first locking step, a first cutting step, a first lowering step, a first removal step, and a first removal step, and a second group of steps consisting of a second erection step, a second installation step, a second fixing step, a second locking step, a second cutting step, a second lowering step, a second removal step, and a second removal step.

[0062] Therefore, according to the first dismantling method of the outer cylinder 3 of this embodiment, when dismantling the outer cylinder 3 by cutting it piece by piece from the upper end of its wall surface, the upper end of the wall surface viewed from above is divided into a first region and a second region, and the first group of steps is performed by alternately repeating the first group of steps, in which the cutting portion 3p in the wall surface of the first region is cut and lowered while being supported by a jack 20 installed so as to apply a load to the second region, and the cutting portion 3q in the wall surface of the second region is cut and lowered while being supported by a jack 20 installed so as to apply a load to the first region, thereby eliminating the need to install heavy machinery at high places or to use tall heavy machinery that can reach high places.

[0063] [2.2. Second method for disassembling the outer cylinder 3] In the second dismantling method, as shown in Figures 17(A)-(D), multiple brackets 52 (hereinafter, brackets are indicated by the symbol "52" or a symbol with an alphabet attached to the symbol "52" (for example, "52A")) are arranged horizontally around the outer wall of the outer cylinder 3. As shown in Figure 17(B), an assembled frame 60 (hereinafter, the assembled frame is indicated by the symbol "60" or a symbol with an alphabet attached to the symbol "60" (for example, "60A")) is installed on the brackets 52, which includes a lower frame 61 that rests on the brackets 52 and an upper frame 63 that is supported by a column 62 provided on the lower frame 61 and is installed above the lower frame 61. A jack 20 is attached to the upper frame 63. In the second dismantling method, these are used to dismantle the outer cylinder 3 by cutting the wall surface 3 from the top end in sections. The following explanation follows the flowchart in Figure 16.

[0064] [2.2.1. Bracket Installation Process (Step S71)] In this process, as shown in Figures 17(A)-(D), multiple brackets 52 (eight in Figure 17) are installed horizontally on the outer wall surface of the outer cylinder 3. It is preferable to install the brackets 52 at equal intervals. Each bracket 52 includes a horizontal section 52a and a support section 52b. The horizontal section 52a and the support section 52b are joined to upper and lower mounting brackets 51, which penetrate the wall surface 3 and are fixed to the wall surface, by bolts 53. In this way, the bracket 52 is attached to the wall surface 3.

[0065] [2.2.2. Assembly and installation process (Step S72)] In this process, the assembled frame 60 is installed so that the lower frame 61 is placed on top of the multiple brackets 52 installed in the bracket installation process (step S71). Jacks 20 are attached to the upper frame 63. In this embodiment, four jacks 20 are attached. As shown in Figures 17(B) and (C), the lower frame 61 is composed of multiple (eight in Figure 17) lower beams 61a placed on the brackets 52. Also, as shown in Figures 17(B) and (D), the upper frame 63 is composed of multiple (eight in Figure 17) upper beams 63a supported by columns 62.

[0066] [2.2.3. Locking process (Step S73)] In this process, first, a hole is drilled in the wall surface 3 at a position below the jack 20 attached to the upper frame 63, and a suspension piece is attached to this hole on the inside of the wall surface 3. The preferred attachment position of the suspension piece is in the center or above the cutting portion 3r (the mesh pattern portion in Figure 18) of the wall surface 3, which will be cut in the cutting process described later, as shown in Figure 18. The range of the cutting portion 3r extends downward from the upper end of the wall surface 3 and includes the attachment position of the suspension piece. The lower limit of the range of the cutting portion 3r is set so that the mass of the cutting portion 3r is approximately 70% of the rated load of the jack 20. In this embodiment, four suspension pieces are provided. The suspension pieces may be installed in the outer cylinder 3 before dismantling the outer cylinder 3, such as during the construction of the outer cylinder 3, to eliminate the need to attach the suspension pieces during dismantling. Furthermore, in the assembly frame installation process (step S72), the assembly frame 60 is installed so that the mounting position of the jack 20 is above the height of the suspension piece.

[0067] Next, the anchor 25 of the jack 20, which is attached to the upper frame 63, is secured to the suspension piece provided on the wall surface 3, which is positioned so that the anchor 25 can be locked to the suspension piece. As a result, when the cutting portion 3r is cut in the cutting process described later, the cutting portion 3r will not fall because it is connected to the jack 20.

[0068] [2.2.4. Cutting Process (Step S74)] In this process, the wall surface 3 is cut by a cutting machine at the upper end of the wall surface 3 and the cutting portion 3r which includes the suspension piece. In this embodiment, the wall surface 3r is cut in such a way that there are four cutting portions 3r.

[0069] [2.2.5. Lowering Process (Step S75)] In this process, the cut portion 3r, which was cut in the cutting process (step S74), is lowered by a jack 20 equipped with an anchor 25 that is locked to a suspension piece included in the cut portion 3r. In this embodiment, four cut portions 3r are lowered.

[0070] [2.2.6. Determination Process (Step S76)] In this step, a determination is made as to whether the outer cylinder 3 can be dismantled by the heavy machinery J on the ground. That is, it is determined whether the height of the outer cylinder 3 at that time is a height that can be dismantled by the heavy machinery J on the ground (for example, about 20m). If it can be dismantled by the heavy machinery J on the ground (step S76: YES), the process proceeds to step S77. On the other hand, if it cannot be dismantled by the heavy machinery J on the ground (step S76: NO), the process proceeds to step S71. In other words, steps S71 to S75 are repeated until the outer cylinder 3 reaches a height that can be dismantled by the heavy machinery J on the ground, and the outer cylinder 3 is cut from the top end.

[0071] [2.2.7. Repeated Process]

[0072] When steps S71 to S75 are repeated multiple times, in the second and subsequent bracket installation steps (step S71), multiple new brackets 52 are installed horizontally at a lower position than the brackets 52 installed in the previous bracket installation step, and the assembly frame installation step (step S72) is performed using these newly installed brackets 52. In other words, the new assembly frame 60 is installed so that the lower frame 61 of the new assembly frame 60 is placed on the newly installed brackets 52.

[0073] [2.2.8. Residual Disposal Process (Step S77)] In this step, the remaining portion of the outer cylinder 3 is dismantled by heavy machinery J on the ground (see Figure 13). Once this step is complete, the outer cylinder 3 is dismantled (see Figure 14), and the dismantling method for the outer cylinder 3 is finished.

[0074] As described above, the second dismantling method of the outer cylinder 3 in this embodiment is a method for dismantling the outer cylinder 3 (an example of an "erected hollow columnar structure") by cutting the wall surface of the outer cylinder 3 from the top end using an assembled frame 60 which includes a lower frame 61 which is placed on brackets 52 provided on the outer wall surface of the outer cylinder 3, and an upper frame 63 which is supported by columns 62 provided on the lower frame 61 and is provided above the lower frame 61, and a jack 20 (an example of a "lifting machine") which is attached to the upper frame 63 and includes wires W and anchors 25 (an example of a "lifting part") provided on the wires W, and the wall surface of the outer cylinder 3 is cut from the top end in sections, and the method is a bracket installation step in which a plurality of brackets 52 are installed horizontally on the outer wall surface of the outer cylinder 3, and the lower frame 61 is placed on the plurality of brackets 52 installed in the bracket installation step The assembly frame installation process involves setting up the assembly frame 60, locking the anchor 25 of the jack 20 attached to the upper frame 63 to a suspension piece (an example of a "suspended part") provided on the wall, cutting the cut portion 3r (an example of a "part of the wall") so as to include the upper end of the wall and the suspension piece, and lowering the cut portion 3r cut in the cutting process using the jack 20 equipped with the anchor 25 locked to the suspension piece included in the cut portion 3r. These steps are repeated multiple times in sequence, and when repeated multiple times, in the second and subsequent bracket installation processes, multiple brackets 52 are newly installed horizontally at a lower position than the brackets 52 installed in the previous bracket installation process, and the assembly frame installation process is performed using these newly installed brackets 52.

[0075] Therefore, according to the second dismantling method of the outer cylinder 3 of this embodiment, when dismantling the outer cylinder 3 by cutting off sections from the upper end of its wall surface, a bracket 52 is provided on the outer wall surface of the outer cylinder 3, an assembly frame 60 with a jack 20 attached is placed on the bracket 52, and the cutting section 3r at the upper end of the wall surface is supported by the jack 20, and the cutting section 3r is repeatedly cut and lowered, thereby eliminating the need to set up heavy machinery at high places or to use tall heavy machinery that can reach high places.

[0076] [2.3. Specific Examples of the Second Disassembly Method for the Outer Cylinder 3] As described above, in the second dismantling method, the assembly frame 60 is placed on the bracket 52, and the cutting portion 3r is locked in place by a jack 20 attached to the upper frame 63, and the cutting is performed while the cutting portion 3r is lowered. This process is repeated, and at this time, the bracket 52 and the assembly frame 60 are lowered in position as the upper end of the outer cylinder 3 is repeatedly cut and the height of the outer cylinder 3 decreases. Below, specific examples of the process of lowering the position of the bracket 52 and the assembly frame 60 will be explained as Specific Example 1 and Specific Example 2.

[0077] [2.3.1.Specific Example 1] In the second and subsequent assembly frame installation process (step S72) performed when repeating steps S71 to S75, as shown in Figure 19, the lower frame 61A of the assembly frame 60A installed in the previous assembly frame installation process becomes the upper frame 63B of the new assembly frame 60B (constructed below the assembly frame 60A), the lower frame 61B of the new assembly frame 60B is newly installed on the multiple brackets 52B newly installed in the bracket installation process (step S71) (see Figure 19(B)), the support column 62B of the new assembly frame 60B is provided on the lower frame 61B of the new assembly frame 60B, and the upper frame 63B of the new assembly frame 60B is supported by the support column 62B of the new assembly frame 60B. Furthermore, in order to compensate for any errors in the mounting position of the newly installed bracket 52B, the length of the support column 62B is set so that there is a gap between the upper end of the support column 62B and the upper frame 63B. A manual hydraulic jack 69 is placed in this gap, and the load of the upper frame 63B is supported by the lower frame 61B via the hydraulic jack 69.

[0078] Then, the jack 20 attached to the upper frame 63A of the assembly frame 60A, which was installed in the previous assembly frame installation process, is transferred to the upper frame 63B of the new assembly frame 60B using manual labor or a hoist installed on the scaffolding 11, and the upper frame 63A and support column 62A of the assembly frame 60A, which were installed in the previous assembly frame installation process, are removed.

[0079] In this specific example 1, a new bracket 52B is installed at a lower position than the previous bracket 52A, and the lower frame 61A of the previous assembly frame 60A is replaced by the upper frame 63B of the new assembly frame 60B. By repeating this process, the installation positions of the bracket 52 and the assembly frame 60 are lowered.

[0080] As explained above, in specific example 1 of the second dismantling method of the outer cylinder 3 of this embodiment, in the second and subsequent assembly frame installation steps performed when steps S71 to S75 are repeated multiple times, the lower frame 61A installed in the previous assembly frame installation step becomes the upper frame 63B of the new assembly frame 60B, and the lower frame 61B of the new assembly frame 60B is newly installed on the multiple brackets 52B newly installed in the bracket installation step, and the new assembly A support column 62B of the new assembly frame 60B is installed on the lower frame 61B of frame 60B, the support column 62B of the new assembly frame 60B supports the upper frame 63B of the new assembly frame 60B, the jack 20 attached to the upper frame 63A of the assembly frame 60A installed in the previous assembly frame installation process is moved to the upper frame 63B of the new assembly frame 60B, and the upper frame 63A and support column 62A of the assembly frame 60A installed in the previous assembly frame installation process are removed.

[0081] Therefore, according to specific example 1 of the second dismantling method for the outer cylinder 3 of this embodiment, as the upper end of the outer cylinder 3 is repeatedly cut and the height of the outer cylinder 3 decreases, the bracket 52 is attached to a progressively lower position, and when the assembly frame 60 is reinstalled to a progressively lower position, the previous lower frame 61A is reused as the new upper frame 61B, thereby shortening the time required to install the new assembly frame 60B.

[0082] [2.3.2.Specific Example 2] In specific example 2, as shown in Figure 20, a telescopic support column 72 is used instead of the support column 62. For example, a telescopic support column 72 with a maximum total length of 4.8m, a minimum total length of 4.8m, a stroke of 3m, and a load capacity of 600kg / column can be used. First, as shown in Figure 20(A), multiple brackets 52P are arranged horizontally, then multiple brackets 52Q are arranged horizontally below them, and then multiple brackets 52R are arranged horizontally below them. The height positions of brackets 52P, 52Q, and 52R are set according to the height of the cut section 3s. For example, bracket 52P is installed below the cut section 3s, which includes the upper end of the wall surface 3.

[0083] The lower frame 61 of the assembly frame 60 is placed on multiple brackets 52Q. The telescopic support column 72 adjusts its extension and retraction so that the upper frame 63 is in a position (for example, higher than the upper end of the wall surface 3) where the cut section 3s can be lifted and supported by a jack 20 attached to the upper frame 63. The arrangement of the lower beam 61a of the lower frame 61 and the upper beam 63a of the upper frame 63 is as shown in Figures 20(B) and (C).

[0084] Then, as shown in Figure 21, the suspension piece and anchor 25 are locked together (step S73), and the wall surface 3 is cut by the cutting machine at the upper end of the wall surface 3 and the cutting portion 3s including the suspension piece (step S74), and the cutting portion 3s is lowered (step S75).

[0085] Next, as shown in Figure 22, the telescopic support column 72 is shortened (for example, to 3m), the upper frame 63 is placed on the bracket 52P, and the upper frame 63 supports the weight of the assembled frame 60.

[0086] Next, as shown in Figure 23, the bracket 52Q is removed, the telescopic support column 72 is extended (for example, to 3m), and the lower frame 61 is placed on the bracket 52R, with the lower frame 61 supporting the weight of the assembled frame 60.

[0087] Next, as shown in Figure 24, remove bracket 52P and attach it to the position where bracket 52Q was attached. This returns it to the state shown in Figure 20, and by repeating this process, the assembly frame 60 moves downwards along the wall surface 3 like an inchworm.

[0088] In other words, in specific example 2, during the second and subsequent assembly frame installation processes when steps S71 to S75 are repeated multiple times, the telescopic support column 72 is extended and retracted, and the brackets installed in multiple stages are used to alternately transfer the load between the upper frame 63 and the lower frame 61 while moving the assembly frame 60 downwards.

[0089] As described above, in specific example 2 of the second dismantling method of the outer cylinder 3 of this embodiment, the support column is a telescopic support column 72 (an example of a "telescopic support column"), and in the second and subsequent assembly frame installation steps performed when steps S71 to S75 are repeated multiple times, the telescopic support column 72 is extended to place the lower frame 61 on the multiple brackets 52R newly installed in the bracket installation step, and then the telescopic support column 72 is retracted to lower the upper frame 63.

[0090] Therefore, according to specific example 2 of the second dismantling method for the outer cylinder 3 of this embodiment, as the upper end of the outer cylinder 3 is repeatedly cut and the height of the outer cylinder 3 decreases, the brackets 52 are attached to progressively lower positions, and when the assembly frame 60 is reinstalled to a progressively lower position, the lower frame 61 and the upper frame 63 are sequentially lowered using the telescopic support column 72. This reduces the time required to lower the position of the assembly frame 60, and since there is no need to create another assembly frame, the number of beam materials used in the assembly frame 60 can be kept to the bare minimum.

[0091] [3. Configuration and Operation of Jack 20]

[0092] The configuration and operation of the jack 20 will be explained using Figure 25. The jack 20 has a first grip 22 and a second grip 23 that grip a wire W to which an anchor 25 is attached at its tip, and a hydraulic jack 21 that pushes the first grip 22 upward. The hydraulic jack 21 has a cylinder 21a and a piston 21b. The jack 20 is controlled by a control device (not shown).

[0093] The control device controls the gripping state of the first grip 22 and the second grip 23 of the wire W to either a gripping state (referred to as the "closed state") or a non-gripping state (referred to as the "open state").

[0094] Next, we will explain the procedure for the jack 20 to pull the wire W upward. First, as shown in Figure 25(A), in the initial state, the first grip 22 and the second grip 23 are controlled to be in the closed position. At this time, the load of the wire W is applied to the second grip 23.

[0095] Next, the control device opens the second grip 23, as shown in Figure 25(B). As a result, the load of the wire W is applied to the first grip 22.

[0096] Next, the control device jacks up the hydraulic jack 21 (extending the piston 21b from the cylinder 21a), as shown in Figure 25(C). As a result, the wire W is pulled upward by the amount that the piston 21b extends from the cylinder 21a.

[0097] Next, in order to jack down the hydraulic jack 21, the control device closes the second grip 23 as shown in Figure 25(D), and then opens the first grip 22 as shown in Figure 25(E). This transitions the state from one where the load of the wire W is applied to the first grip 22 to one where the load of the wire W is applied to the second grip 23.

[0098] Next, the control device lowers the hydraulic jack 21, as shown in Figure 25(F).

[0099] Next, the control device closes the first grip 22, as shown in Figure 25(G). As a result, the jack 20 is in the same state as shown in Figure 25(A) (except that the positions in which the first grip 22 and the second grip 23 are gripping the wire W are different).

[0100] From this point onward, the wire W can be continuously pulled up by repeating the steps shown in Figures 25(A) to (G). [Explanation of Symbols]

[0101] 1: Chimney 2: Inner cylinder 2a: Discharge section 2b: Induction part 3: Outer cylinder (wall) 3a:Aperture 3n: Cutting part 3p: Cutting part 3q: Cutting part 3r: Cutting part 3s: Cutting part 4: Basics 10: Must 11: Scaffolding 17: Load-bearing beam 18: Jack fixing beam 20: Jack-type lifting machine (jack) 21: Hydraulic jack 21a: Cylinder 21b: Piston 22: First grip 23: Second grip 25: Anchor 31: Load-bearing beam 33: Fixed beam 51: Mounting hardware 52: Bracket 52A: Bracket 52B: Bracket 52C: Bracket 52P: Bracket 52Q: Bracket 52R: Bracket 52a:Horizontal part 52b: Support part 53: Bolt 60: Assembly stand 60A: Assembly stand 60B: Assembly stand 61: Stand 61A: Mounting frame 61B: Stand 61a: Lower beam 62: Strut 62A: Strut 62B: Post 63: Stand 63A: Mounting frame 63B: Stand 63a: Upper beam 69: Hydraulic jack 72: Telescoping support J: Heavy equipment W: wire

Claims

[Claim 1] The erected hollow columnar structure, An assembly frame comprising: a lower frame placed on a bracket provided on the outer wall surface of the columnar structure; and an upper frame supported by a column provided on the lower frame and provided above the lower frame; A lifting machine comprising a wire and a lifting section provided on the wire, which is attached to the upper frame, A method for dismantling a columnar structure, comprising using to cut off the wall surface of the columnar structure from the upper end in sections, A bracket installation step involves installing a plurality of the brackets horizontally in a row on the outer wall surface of the columnar structure, An assembly frame installation step involves installing the assembly frame so that the lower frame is placed on a plurality of brackets installed in the bracket installation step, A locking step of locking the lifting part of the lifting machine attached to the upper frame to the lifting part provided on the outer wall surface, A cutting step of cutting a part of the wall surface so as to include the upper end of the wall surface and the suspended portion, A lowering step is to lower a portion of the wall surface cut in the cutting step using a lifting machine equipped with a lifting portion that is engaged with the suspended portion included in the portion of the wall surface, Repeat this process multiple times in sequence. When repeating the process multiple times, in the second and subsequent bracket installation steps, multiple brackets are newly installed horizontally at a lower position than the brackets installed in the previous bracket installation step. In the second and subsequent assembly frame installation steps, which are performed when the process is repeated multiple times, The lower frame installed in the previous assembly frame installation process will be used as the upper frame of the new assembly frame. In the bracket installation process described above, a new lower frame of the new assembly frame is installed on the multiple brackets that were newly installed. The lower frame of the new assembly frame is provided with the support column of the new assembly frame, and the upper frame of the new assembly frame is supported by the support column of the new assembly frame. The lifting machine, which was attached to the upper frame of the assembly frame installed in the previous assembly frame installation process, is then moved to the upper frame of the new assembly frame. A method for dismantling a columnar structure, characterized by removing the upper frame and support columns of the assembly frame that were installed in the previous assembly frame installation process.

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