Demolition methods for construction structures

Abstract

This method for dismantling a construction structure that has a columnar support object extending from a reference surface and has an upper structure provided to an upper part of the columnar support object comprises: a step for laying a cable between the upper structure and the reference surface; a step for lowering a component generated by dismantling the upper structure along the cable to the reference surface; and a step for collapsing the columnar support object from the end on the reference surface side. In the step for lowering the component to the reference surface, the lowering speed is controlled by a braking mechanism.

Description

Technical Field

[0001] The present disclosure relates to a method for demolishing a construction structure.

Background Art

[0002] For example, as a technique for demolishing a construction structure such as a chimney, the one described in Patent Document 1 below is known. In the technique according to Patent Document 1 below, it is said that the chimney can be collapsed while burdening the load of the chimney by the arm by unwinding a wire while arranging a pair of long arms along the side of the chimney.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above technique, since it is necessary to additionally provide a long arm, an increase in the cost of demolition work and a lengthening of the construction period become problems. Furthermore, since the collapse speed when collapsing a construction structure is controlled only by unwinding a wire, there is also a problem that the collapse speed becomes excessive.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a method for demolishing a construction structure that can proceed with demolition work more cheaply and easily.

Means for Solving the Problems

[0006] To solve the above problems, the method for dismantling a construction structure according to the present disclosure is a method for dismantling a construction structure having a columnar support column extending from a reference plane and a superstructure provided on the upper part of the support column, comprising the steps of: stretching a cable between the superstructure and the reference plane; lowering the parts generated by dismantling the superstructure to the reference plane while suspended from the cable; and collapsing the support column from the end on the reference plane side, wherein the descent speed is controlled by a braking mechanism in the step of lowering the parts to the reference plane.

[0007] The method for demolishing a construction structure according to this disclosure is a method for demolishing a construction structure having columnar support columns extending from a reference plane and a superstructure provided on the upper part of the support columns, comprising the steps of: attaching a thrust device to the construction structure that generates thrust toward the reference plane side; and causing the construction structure to collapse from the end toward the reference plane side while controlling the collapse speed with the thrust from the thrust device.

[0008] The method for demolishing a construction structure relating to this disclosure is a method for demolishing a construction structure having columnar support columns extending from a reference plane and a superstructure provided on top of the support columns, wherein the reference plane is the seabed, lakebed, or riverbed, and includes the steps of preventing the dispersal of sludge by generating a water flow around the support columns in the water, and collapsing the construction structure while the water flow is being generated. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a method for demolishing construction structures that allows for more inexpensive and easier demolition work. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing an example of a construction structure according to the first embodiment of this disclosure. [Figure 2] This is a flowchart showing the steps of the demolition method for a construction structure according to the first embodiment of this disclosure. [Figure 3] This is an explanatory diagram showing the state during demolition in the method for demolition of a construction structure according to the first embodiment of this disclosure. [Figure 4] This is an explanatory diagram showing the step of collapsing a support column in a method for dismantling a construction structure according to the first embodiment of this disclosure. [Figure 5] This figure shows a modified example of a cable used in a method for dismantling a construction structure according to the first embodiment of this disclosure. [Figure 6] This flowchart shows the steps of the demolition method for a construction structure according to the second embodiment of this disclosure. [Figure 7] This is an explanatory diagram showing the state during demolition in a method for demolition of a construction structure according to the second embodiment of this disclosure. [Figure 8] This figure shows the application of the construction structure demolition method according to the second embodiment of this disclosure to a wind turbine, and is a diagram showing the step of demolishing the superstructure. [Figure 9] This flowchart shows the steps of the demolition method for a construction structure according to the third embodiment of this disclosure. [Figure 10] This is an explanatory diagram showing the state during demolition in a method for demolition of a construction structure according to the third embodiment of this disclosure. [Modes for carrying out the invention]

[0011] <First Embodiment> The method for dismantling the construction structure 1 according to the first embodiment of this disclosure will be described below with reference to Figures 1 to 4.

[0012] (Structure of the building) As shown in Figure 1, the construction structure 1 according to this embodiment is, for example, a tower-like structure extending from the seabed (reference plane 2) to the surface of a river, lake, or marsh. More specifically, examples include offshore lighthouses and oil drilling rigs. In the following description, the construction structure 1 will be schematically described as comprising a support column 11 and a superstructure 12. The support column 11 is fixed to the seabed and has a columnar shape that extends vertically from the seabed to the surface. The superstructure 12 is provided at the upper end of the support column 11. In other words, the support column 11 is provided to support the weight of the superstructure 12.

[0013] (Method for demolishing construction structure 1) Next, with reference to Figures 2 to 4, a method for dismantling the construction structure 1 will be described. As shown in Figure 2, this dismantling method includes the steps of: generating a water flow F in step S1; laying a cable 3 in step S2; dismantling the superstructure 12 in step S3; attaching the aircraft 51 to the parts 13 generated by the dismantling in step S4; lowering the parts 13 along the cable 3 in step S5; collapsing the support column 11 in step S6; and stopping the water flow F in step S7.

[0014] As shown in Figure 3, in step S1, a water flow F is generated around the support column 11 by a water flow generator 4 installed in the water. This is to prevent sludge from the bottom of the water from being scattered or metal shavings from being scattered when the support column 11 is collapsed or when it is cut or machined in the subsequent step S6. Specifically, the water flow generator 4 could be a large pump or a water flow F fan. Other possibilities include a device that generates water flow by promoting localized convection with a heater, or a device that generates water flow with magnetic force. In addition, it is possible to install, for example, a plate-shaped member on either side of the support column 11 to restrict the direction of the water flow F. It is also possible to omit step S1 and instead lay a dustproof net or the like on the bottom of the water to prevent sludge from being scattered.

[0015] In step S2, a cable body 3 is stretched between the upper structure 12 and the ground or a workboat. As the cable body 3, a metal wire is preferable. The cable body 3 is stretched obliquely with respect to the horizontal direction so that its height gradually decreases from the upper structure 12 toward the ground or the workboat. As long as environmental conditions permit, the gentler the inclination angle of the cable body 3, the more preferable it is.

[0016] Next, in step S3, the upper structure 12 is disassembled together with the components 13. Then, in step S4, a flying object 51 as a braking mechanism 5 is attached to the component 13. The flying object 51 is a drone or a multicopter capable of flying autonomously, and can hover and move in the air with the component 13 suspended from the fuselage. In this state, the component 13 is placed on the cable body 3. That is, the weight of the component 13 is borne by the support from below by the cable body 3 and the support from above by the flying object 51. Note that it is not always necessary to attach the flying object 51 to the component 13; it may also rely on its own weight. In this case, an example of controlling the falling speed of the component 13 by controlling the inclination of the cable body 3 can be considered.

[0017] After that, in step S5, while moving the flying object 51 along the cable body 3, the component 13 is slid on the cable body 3 and lowered toward the ground or a workboat. At this time, the moving speed of the flying object 51 is controlled so that the effective speed becomes constant or is below a predetermined reference speed. That is, the flying object 51 serves as a brake when the component 13 is lowered. Steps S3 to S5 are sequentially repeated for all the components 13 constituting the upper structure 12. As a result, the upper structure 12 is disassembled, and only the support column 11 remains.

[0018] Subsequently, in step S6, as shown in Figure 4, the support column 11 is cut near the end on the seabed side and collapsed due to its own weight. Alternatively, in addition to the weight of the support column 11, it is also possible to control the collapse speed using a flying object 51 such as a drone or a hydraulic thrust device. At this time, the water flow F generated in step S1 suppresses the dispersal of sludge and dust from the seabed. Step S1 can also be performed immediately before step S6. Finally, in step S7, the water flow generator 4 is stopped to stop the water flow F. With this, all steps of the method for dismantling the construction structure 1 are completed.

[0019] (Effects and Benefits) In conventional demolition methods, it was common to demolish the construction structure 1 using lifting equipment such as cranes. This resulted in increased labor costs and prolonged construction periods. Furthermore, when collapsing the support column 11, it was common to proceed with the work while pulling the support column 11 with numerous wires. This made it difficult to control the collapse speed, hindering the efficiency and safety of the work. In addition, when collapsing the support column 11 underwater, sludge and other materials from the seabed were stirred up, causing environmental damage, which was another issue. Therefore, in this embodiment, the above-mentioned methods are employed.

[0020] According to the above method, demolition work can be carried out using only the rope 3 and braking mechanism 5, without the need for expensive lifting equipment such as cranes. This reduces the cost and time required to transport lifting equipment to the work site, as well as the personnel costs of operators. Therefore, it is possible to reduce work costs and shorten the construction period. Furthermore, since the braking mechanism 5 controls the descent speed while lowering the parts 13, the descent speed can be adjusted arbitrarily. For example, when lowering large and heavy parts 13, it is possible to lower them at a slower speed to ensure safety. Conversely, when lowering small and lightweight parts 13, it is possible to lower them at a faster speed to prioritize work efficiency. In this way, the above method can significantly improve work efficiency.

[0021] Furthermore, according to the above method, since a flying body 51 that can move freely in the air is used as the braking mechanism 5, the descent speed of the part 13 can be controlled more precisely and freely. In addition, since the flying body 51 is also capable of hovering in the air, the descent of the part 13 can be stopped and restarted at will. This makes it possible to ensure safety during the descent operation. In addition, it is also possible to transport the part 13 from the ground to the air.

[0022] Furthermore, according to the above method, when the support column 11 is collapsed underwater, a water flow F is generated in advance, which prevents sludge and other debris from being stirred up from the bottom of the water. In addition, the debris generated as a result of the collapse can be collected in a desired location by the water flow F. This limits the work area when collecting the debris later, thus achieving both improved work efficiency and cost reduction. In this way, the above method makes it possible to carry out demolition work smoothly while minimizing the environmental impact.

[0023] The first embodiment of this disclosure has been described above. Various modifications and improvements can be made to the above method without departing from the gist of this disclosure. For example, the first embodiment described an example in which a component 13 is lowered along a single cable 3. However, as a modified example, as shown in Figure 5, it is also possible to use a double cable 3. This allows the weight of the component 13 to be more stably supported by the cable 3, further improving the efficiency and safety of the work. Furthermore, it is possible to use a triple cable 3, provided that cost and other conditions permit. Moreover, it is possible to install multiple cables 3 in multiple directions from the superstructure 12. This allows the dismantling work to proceed even more efficiently. In addition, instead of the flying body 51 as the braking mechanism 5, a thrust device that generates thrust toward the reference plane 2 can be used. The thrust device here could be, for example, a device that pumps water from underwater and sprays it toward the reference plane 2. By using this thrust to support the component 13 from below while lowering it, the descent speed can be freely controlled. Furthermore, since water from the surrounding work area is used as the spraying medium, cost reductions and environmental impact reductions can be achieved. In addition, a movable pulley can also be used as the braking mechanism 5.

[0024] <Second Embodiment> Next, a second embodiment of this disclosure will be described with reference to Figures 6 to 8. Components similar to those in the first embodiment will be denoted by the same reference numerals, and detailed descriptions will be omitted. Furthermore, unlike the first embodiment, this embodiment will be described using a ground-based construction structure 1 as an example. Specific examples of ground-based construction structures 1 include buildings, tower-like structures, chimneys, and steel towers. In any case, the construction structure 1 is schematically composed of a superstructure 12 and supporting columnar structures 11.

[0025] As shown in Figure 6, the method for dismantling the construction structure 1 according to this embodiment includes the steps of: attaching a thrust device 52 to the upper end of a support column 11 in step S21; stretching a cable 3 between the superstructure 12 and the ground, etc. in step S22; dismantling the superstructure 12 into parts 13 in step S23; attaching an aircraft 51 to the parts 13 in step S24; lowering the parts 13 in step S25; driving the thrust device 52 in step S26; and collapsing the support column 11 in step S27.

[0026] In step S21, as shown in Figure 7, a thrust device 52 is attached to the upper end or side of the support column 11. The thrust device 52 could be, for example, a device that pumps up water and sprays it toward the reference surface 2, or a small jet engine. Furthermore, it is desirable that the thrust device 52 has a nozzle that can freely change the thrust direction within a 360° range. Note that this step S21 may be performed immediately before step S26, which will be described later.

[0027] In step S22, a cable 3 is stretched between the superstructure 12 and the ground, similar to the method described in the first embodiment. A metal wire is preferred as the cable 3. The cable 3 is stretched diagonally to the horizontal direction so that its height gradually decreases from the superstructure 12 towards the ground. Furthermore, as far as environmental conditions allow, the gentler the angle of inclination of the cable 3, the preferable it is.

[0028] Next, in step S23, the superstructure 12 is disassembled into individual parts 13. Then, in step S24, the aircraft 51, which serves as the braking mechanism 5, is attached to each part 13. The aircraft 51 is an unmanned drone or multicopter capable of hovering and moving in the air with the parts 13 suspended from its body. In this state, the parts 13 are placed on the cable 3. In other words, the weight of the parts 13 is supported from below by the cable 3 and from above by the aircraft 51.

[0029] Subsequently, in step S25, the flying body 51 is moved along the cable 3, causing the component 13 to slide along the cable 3 and descend toward the ground. At this time, the speed of the flying body 51 is controlled so that the effective speed is constant or below a predetermined reference speed. In other words, the flying body 51 acts as a brake during the descent of the component 13. Steps S23 to S25 are repeated sequentially for each component 13 that makes up the superstructure 12. As a result, the superstructure 12 is dismantled, leaving only the support column 11.

[0030] Subsequently, in step S26, the thrust device 52 described above is driven to generate thrust toward the reference plane 2. In the following step S27, as shown in Figure 7, the support column 11 is cut near the end on the seabed side and collapses due to its own weight. At this time, the weight of the support column 11 is supported from below by the thrust generated by the thrust device 52.

[0031] (Effects and Benefits) According to the above method, when collapsing the support column 11, the thrust generated by the thrust device 52 allows the support column 11 to collapse while bearing its weight on the reference plane 2 side. This makes it possible to precisely control the collapse speed and direction of the support column 11. Conversely, it is also possible to direct the thrust of the thrust device 52 toward the rear of the collapse direction. In this case, the collapse speed can be further increased, allowing the work to be completed more quickly. Furthermore, it is also possible to cut the support column 11, move the worker away from it, and then initiate the collapse using the thrust from the thrust device 52. This further ensures the safety of the worker.

[0032] Furthermore, according to the above method, demolition work can be carried out using only the rope 3 and braking mechanism 5, without the need for expensive lifting equipment such as cranes. This reduces the cost and time required to transport lifting equipment to the work site, as well as the personnel costs of operators. Therefore, it is possible to reduce work costs and shorten the construction period. In addition, since the braking mechanism 5 controls the descent speed while lowering the parts 13, the descent speed can be adjusted arbitrarily. For example, when lowering large and heavy parts 13, it is possible to lower them at a slower speed to ensure safety. Conversely, when lowering small and lightweight parts 13, it is possible to lower them at a faster speed to prioritize work efficiency. In this way, the above method can significantly improve work efficiency.

[0033] Furthermore, according to the above method, since a flying body 51 that can move freely in the air is used as the braking mechanism 5, the descent speed of the part 13 can be controlled more precisely and freely. In addition, since the flying body 51 is also capable of hovering in the air, the descent of the part 13 can be stopped and restarted at will. This makes it possible to ensure safety during the descent operation more reliably.

[0034] The second embodiment of the present disclosure has been described above. It is possible to make various changes and modifications to the above method without departing from the gist of the present disclosure. For example, as shown in Figure 8, the above dismantling method can also be applied to a wind turbine 60. As an example, the wind turbine 60 comprises a support column 11, a nacelle 61, and a propeller 62. The nacelle 61 and propeller 62 constitute the superstructure 12. By sequentially dismantling the nacelle 61 and propeller 62, and finally collapsing the support column 11, the same effects as described above can be obtained.

[0035] <Third Embodiment> Next, a third embodiment of this disclosure will be described with reference to Figures 9 and 10. Components similar to those in the embodiments described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0036] In this embodiment, as shown in Figure 10, the target of the dismantling work is a wind turbine 60 installed on the water (an offshore wind turbine as an example). The wind turbine 60 comprises a support column 11, a nacelle 61, and a propeller 62. The nacelle 61 and propeller 62 constitute the superstructure 12. Inside the nacelle 61 are built-in devices such as a generator and lubrication system connected to the shaft of the propeller 62. The lower end of the support column 11 is fixed to the seabed.

[0037] As shown in Figure 9, the demolition method according to this embodiment includes the steps of: generating a water flow F in water (S31); attaching a thrust device 52 to the superstructure 12 (S32); driving the thrust device 52 (S33); cutting the support column 11 (S34); and collapsing the support column 11 (S35).

[0038] In step S31, a water flow F is generated by a water flow generator 4 installed in the water, which flows around the support column 11. This is to prevent sludge and other debris from being scattered when the support column 11 is collapsed in the subsequent step S35. Specifically, the water flow generator 4 could be a large pump or a water flow F fan. In addition, it is possible to install plate-shaped members on either side of the support column 11 to restrict the direction of the water flow F.

[0039] In step S32, as an example, a thrust device 52 is attached to the rear side of the nacelle 61 (i.e., the side opposite the propeller 62). Possible thrust devices 52 include, for example, a device that pumps up water and sprays it toward the reference plane 2, or a small jet engine. Furthermore, it is desirable that the thrust device 52 has a nozzle that can freely change the thrust direction within a 360° range.

[0040] In step S33, the thrust device 52 is driven to generate thrust toward the reference plane 2 (seabed). In the following step S34, the support column 11 is cut near the end on the seabed side, causing the entire wind turbine 60 (construction structure 1) to collapse under its own weight (step S35). At this time, the weight of the construction structure 1 is supported from below by the thrust generated by the thrust device 52. In other words, the collapse speed is controlled by the magnitude of the thrust. Finally, in step S36, the water flow F is stopped. With this, the dismantling of the construction structure 1 is completed.

[0041] (Effects and Benefits) In conventional demolition methods, it was common to use lifting equipment such as cranes to dismantle the construction structure 1. This resulted in increased labor costs and prolonged construction periods. Furthermore, when collapsing the support column 11, it was common to proceed with the work while pulling the support column 11 with numerous wires. This made it difficult to control the collapse speed, hindering the efficiency and safety of the work. In addition, when collapsing the support column 11 underwater, sludge and other materials from the seabed were stirred up, causing environmental damage, which was another issue. In particular, since a large amount of lubricating oil flows inside the nacelle 61 of the wind turbine 60, there was concern that the lubricating oil would leak into the water when the nacelle 61 was submerged. Although lubricating oil is removed before work, there was concern that a certain amount of oil and grease could not be completely removed. Therefore, in this embodiment, the above-mentioned methods are adopted.

[0042] According to the above method, when collapsing the construction structure 1, the thrust generated by the thrust device 52 can cause the construction structure 1 to collapse while bearing its weight on the reference plane 2 side. This makes it possible to precisely control the collapse speed of the construction structure 1. Conversely, it is also possible to direct the thrust direction of the thrust device 52 toward the rear in the direction of collapse. In this case, the collapse speed can be further increased, making it possible to complete the work more quickly.

[0043] Furthermore, according to the above method, when the construction structure 1 is to collapse underwater, a water flow F is generated in advance, which prevents sludge and other debris from being stirred up from the bottom of the water. In addition, the debris and grease generated as a result of the collapse can be collected in a desired location by the water flow F. This limits the work area when collecting the dust later, thus achieving both improved work efficiency and cost reduction. In this way, the above method makes it possible to carry out demolition work smoothly while minimizing the environmental impact.

[0044] The third embodiment of this disclosure has been described above. It is possible to make various changes and modifications to the above method without departing from the gist of this disclosure.

[0045] <Note> The method for dismantling the construction structure 1 described in each embodiment can be understood, for example, as follows.

[0046] (1) A method for dismantling a construction structure 1 according to the first embodiment is a method for dismantling a construction structure 1 having a columnar support column 11 extending from a reference plane 2 and a superstructure 12 provided on the upper part of the support column 11, the method comprising the steps of: stretching a cable 3 between the superstructure 12 and the reference plane 2; lowering parts 13 generated by dismantling the superstructure 12 to the reference plane 2 while suspended from the cable 3; and causing the support column 11 to collapse from the end on the reference plane 2 side, wherein in the step of lowering the parts 13 to the reference plane 2, the descent speed is controlled by a braking mechanism 5.

[0047] According to the method described above, demolition work can be carried out using only the rope 3 and braking mechanism 5, without the use of lifting equipment such as cranes. This makes it possible to reduce work costs and shorten the construction period. Furthermore, since the braking mechanism 5 controls the descent speed while lowering the parts 13, the descent speed can be adjusted arbitrarily. This makes it possible to further improve the efficiency of the work.

[0048] (2) The method for dismantling the construction structure 1 according to the second embodiment is the method for dismantling the construction structure 1 according to (1), wherein the braking mechanism 5 is an aircraft 51 capable of lifting the parts 13.

[0049] According to the above method, since a flying body 51 that can move freely in the air is used as the braking mechanism 5, the descent speed of the component 13 can be controlled more precisely and freely.

[0050] (3) The method for dismantling the construction structure 1 according to the third embodiment is the method for dismantling the construction structure 1 according to (1), wherein the braking mechanism 5 is a thrust device 52 provided on the part 13 that generates thrust toward the reference plane 2.

[0051] According to the above method, by generating thrust on the reference plane 2 side using the thrust device 52, the component 13 can be supported with a relatively large force. This makes it possible to further stabilize the descent speed of the component 13.

[0052] (4) A method for dismantling a construction structure 1 according to the fourth embodiment is a method for dismantling a construction structure 1 according to any one embodiment of (1) to (3), wherein in the step of collapsing the support column 11, the collapse speed is controlled by using a thrust device 52 provided on the support column 11 and which generates thrust toward the reference plane 2.

[0053] According to the above method, when the support column 11 is toppled, the thrust generated by the thrust device 52 can cause the support column 11 to collapse while bearing its weight on the reference surface 2 side. This makes it possible to precisely control the collapse speed of the support column 11.

[0054] (5) The method for demolishing the construction structure 1 according to the fifth embodiment is the method for demolishing the construction structure 1 according to any one embodiment of (1) to (4), wherein the reference plane 2 is the seabed, lakebed, or riverbed, and in the step of collapsing the support columnar object 11, a water flow F is generated in the water that flows around the support columnar object 11 from before to after the collapse of the support columnar object 11 to prevent the dispersal of sludge.

[0055] According to the method described above, when the support column 11 is toppled underwater, a water flow F is generated in advance, which prevents sludge and other debris from being stirred up from the bottom of the water. In addition, the debris generated as a result of the collapse can be collected in a desired location by the water flow F. This makes it possible to proceed with the demolition work smoothly while minimizing the environmental impact.

[0056] (6) A method for demolishing a construction structure 1 according to the sixth embodiment is a method for demolishing a construction structure 1 having a columnar support column 11 extending from a reference plane 2 and a superstructure 12 provided on the upper part of the support column 11, comprising the steps of: attaching a thrust device 52 to the construction structure 1 that generates thrust toward the reference plane 2 side; and causing the construction structure 1 to collapse from the end on the reference plane 2 side while controlling the collapse speed with the thrust from the thrust device 52.

[0057] According to the above method, when collapsing the construction structure 1, the thrust generated by the thrust device 52 can cause the construction structure 1 to collapse while bearing its weight on the reference plane 2 side. This makes it possible to precisely control the collapse speed of the construction structure 1.

[0058] (7) A method for demolishing a construction structure 1 according to the seventh embodiment is a method for demolishing a construction structure 1 having a columnar support columnar object 11 extending from a reference plane 2 and a superstructure 12 provided on the upper part of the support columnar object 11, wherein the reference plane 2 is the seabed, lakebed, or riverbed, and includes the steps of preventing the dispersal of sludge by generating a water flow F flowing around the support columnar object 11 in the water, and collapsing the construction structure 1 while the water flow F is being generated.

[0059] According to the method described above, when the construction structure 1 is to collapse underwater, a water flow F is generated in advance, which prevents sludge and other debris from being stirred up from the bottom of the water. In addition, the debris generated as a result of the collapse can be collected in a desired location by the water flow F. This makes it possible to proceed with the demolition work smoothly while minimizing the environmental impact. [Industrial applicability]

[0060] According to the above method for demolishing construction structures, demolition work can be carried out more cheaply and easily. [Explanation of symbols]

[0061] 1…Construction structure 2...Reference plane 3...chord body 4…Water flow generator 5...Brake mechanism 11...Support columnar object 12...Superstructure 13...parts 51... Flying object 52...Thrust device 60...Windmill 61… Nasser 62... Propeller F…Water flow

Claims

1. A method for demolishing a construction structure having columnar support columns extending from a reference plane, and a superstructure provided on top of the support columns, The steps include stretching a cable between the superstructure and the reference plane, The steps include lowering the parts generated by dismantling the superstructure to the reference plane while suspended from the rope, The steps include: collapsing the support columnar object from the end on the reference surface side, Includes, In the step of lowering the aforementioned part to the reference surface, the descent speed is controlled by a braking mechanism. The braking mechanism is an aircraft capable of lifting the component. Methods for demolishing construction structures.

2. The method for dismantling a construction structure according to claim 1, wherein the braking mechanism is a thrust device provided on the component that generates thrust toward the reference surface.

3. The method for demolishing a construction structure according to claim 1 or 2, wherein in the step of causing the support column to collapse, the collapse speed is controlled using a thrust device provided on the support column that generates thrust toward the reference plane.

4. A method for demolishing a construction structure having a columnar support column extending from a reference plane, and a superstructure provided on the upper part of the support column, The steps include stretching a cable between the superstructure and the reference plane, The steps include lowering the parts generated by dismantling the superstructure to the reference plane while suspended from the rope, The steps include: collapsing the support columnar object from the end on the reference surface side, Includes, In the step of lowering the aforementioned part to the reference surface, the descent speed is controlled by a braking mechanism. The aforementioned reference plane is the seabed, lakebed, or riverbed. A method for demolishing a construction structure, wherein in the step of collapsing the support column, a water flow is generated in the water around the support column from before to after the collapse of the support column to prevent the dispersion of sludge.

5. A method for demolishing a construction structure having columnar support columns extending from a reference plane, and a superstructure provided on top of the support columns, The aforementioned reference surface is the seabed, lakebed, or riverbed, and the step of preventing the dispersal of sludge is to generate a water flow around the supporting columnar object in the water, The steps include: collapsing the construction structure while the aforementioned water flow is occurring; A method for demolishing a construction structure that includes [specific components / materials].

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