Method for dismantling structure

Abstract

Provided is a method for dismantling a structure including a resin portion in at least part thereof, said method comprising a step for heating at least one part of the resin portion to soften said one part, and a step for separating one side of the structure from the other side, the softened one part being therebetween.

Description

How to demolish a structure

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

[0002] Patent Document 1 discloses a demolition method for dismantling an existing steel tower. This demolition method includes a step of cutting the upper tower body at a cutting position to separate a unit tower body from the lower part of the upper tower body, and a step of transporting the unit tower body to the outside and removing it.

[0003] JP 2010-1649 A

[0004] However, in the demolition method for dismantling an existing steel tower disclosed in Patent Document 1, there is a risk that dust such as chips and debris will fly when the upper tower body is cut.

[0005] In view of the above circumstances, at least one embodiment of the present invention aims to provide a structure demolition method that can suppress the scattering of dust when a structure is demolished.

[0006] A method for dismantling a structure according to at least one embodiment of the present invention is a method for dismantling a structure that includes at least a resin portion, and includes the steps of: softening at least a portion of the resin portion by heating the portion; and separating one side of the structure from the other side by sandwiching the softened portion.

[0007] According to at least one embodiment of the present invention, scattering of dust can be suppressed when a structure is demolished.

[0008] 1 is a diagram schematically showing a structure according to embodiment 1. FIG. 1 is a diagram schematically showing a method for dismantling the structure shown in FIG. 1. FIG. 2 is a diagram schematically showing a structure according to embodiment 2. FIG. 3 is a diagram schematically showing a method for dismantling the structure shown in FIG. 4. FIG. 5 is a diagram schematically showing a step of heating a resin portion in which a fastener is embedded. FIG. 6 is a diagram schematically showing a step of lowering a first member by gravity. FIG. 7 is a diagram schematically showing a step of passing an electric current through a heating wire wound around at least a portion of a resin portion. FIG. 8 is a diagram schematically showing a step of exposing a portion of the fastener from the resin portion and a step of passing an electric current through a portion of the fastener. FIG. 9 is a diagram schematically showing a step of placing a coil close to the fastener and a step of passing a high-frequency current through the coil. FIG. 11 is a diagram schematically showing a state in which coils are placed on one side and the other side of the extension direction of the fastener. FIG. 12 is a diagram schematically showing a meteorological observation tower. FIG. 13 is a diagram schematically showing a method for dismantling the meteorological observation tower shown in FIG. 11. FIG. 14 is a diagram showing a wind turbine. FIG. 15 is a diagram schematically showing a method for dismantling the wind turbine shown in FIG. 5.

[0009] Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of components described in the embodiments or shown in the drawings are merely illustrative and are not intended to limit the scope of the present invention. For example, expressions expressing relative or absolute arrangements, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," not only strictly express such arrangements, but also express relative displacements with tolerances or angles or distances to the extent that the same function is achieved. Furthermore, expressions expressing shapes such as a rectangular or cylindrical shape not only express shapes such as a rectangular or cylindrical shape in the strict geometric sense, but also express shapes including concave and convex portions, chamfered portions, etc., to the extent that the same effect is achieved. On the other hand, expressions such as "comprise," "comprise," "include," "include," or "have" of one component are not exclusive expressions that exclude the presence of other components.

[0010] [Structure Dismantling Method According to Embodiment 1] FIG. 1 is a diagram schematically illustrating a structure 10 according to Embodiment 1. FIG. 2 is a diagram schematically illustrating a method for dismantling the structure shown in FIG. 1. The structure 10 to which the structure dismantling method according to Embodiment 1 is applicable is a structure that includes at least a resin portion 12 in at least two or more boundary portions separating the structure. The material of the remaining portion, as well as the shape and structure, are not limited as long as the boundary portions are made of a resin material. Furthermore, although resin is a non-conductor, the resin portion may contain a conductor, such as carbon fiber reinforced plastic (CFRP). The structure dismantling method according to Embodiment 1 can be applied to structures such as weather observation towers, wind turbines, aircraft, ships, tanks, and automobiles. Here, a method for dismantling a hollow structure 10 extending in the direction of gravity and having at least two or more boundary portions separating the structure from the hollow portion 12 made of a resin material is described as an example, but is not limited thereto. The resin material that constitutes the boundary portion that separates at least two or more parts is, for example, epoxy resin, phenolic resin, polyester resin, etc., and is made of fiber-reinforced plastic (FRP) such as glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic, Kevlar fiber reinforced plastic (KFRP), etc.

[0011] As shown in Figure 2, the method of dismantling structure 10 includes a step (S1) of softening at least a portion 14 of resin portion 12 by heating said portion 14, and a step (S2) of separating a portion 16 on one side of structure 10 from a portion 18 on the other side by sandwiching said softened portion 14.

[0012] In step (S1) of softening at least a portion 14 of the resin portion 12 by heating the portion 14, the reason why at least a portion 14 of the resin portion 12 is heated is because it is not necessary to heat the entire resin portion 12. Heating of at least a portion 14 of the resin portion 12 is performed, for example, by passing an electric current through a heating wire 20 wrapped around the portion 14 (resin portion 12). If the resin portion 12 is a 180°C curing epoxy resin, it will soften at temperatures above 200°C and decompose at around 500°C.

[0013] In step (S2) of separating the portion 16 on one side of the structure 10 from the portion 18 on the other side thereof by sandwiching the softened portion 14, the portion 16 on one side of the structure is separated from the portion 18 on the other side thereof, with the softened portion 14 as the boundary. For example, if the structure 10 extends along the direction of gravity, the portion 16 on the lower side in the direction of gravity (one side) is separated from the portion 18 on the upper side in the direction of gravity (the other side) with the softened portion 14 as the boundary, or separation may be achieved by applying a load to the portion 16 on one side.

[0014] According to the method for dismantling a structure 10 of embodiment 1, at least a portion 14 of the resin portion 12 of the structure 10 is heated to soften the portion 14, and the softened portion 14 is sandwiched between a portion 16 on one side of the structure 10 and a portion 18 on the other side, thereby suppressing the scattering of dust when the structure 10 is dismantled.

[0015] [Structure Dismantling Method According to Embodiment 2] FIG. 3 is a diagram schematically illustrating a structure 30. FIG. 4 is a diagram schematically illustrating a method for dismantling the structure 30 shown in FIG. 3. The structure 30, to which the structure dismantling method according to Embodiment 2 is applied, is a structure including at least a portion of resinous parts 32, 34 and extending along the direction of gravity. The structure 30 includes a first member 40 provided on one side of a portion 36 (38) of the resinous parts 32, 34 to be softened, and a second member 42 provided on the other side and joined to the first member 40. The first member 40 and the second member 42 are fastened together by a metal fastener 44 embedded in the resinous part 32 (34) provided in at least one of the first member 40 and the second member 42. The metal fastener 44 may be, for example, a bolt and a nut, one of which is embedded in the first member 40 and the other of which is embedded in the second member 42.

[0016] 4, the method for dismantling the structure 30 includes a step (S11) of softening at least a portion 36 (38) of the resin portion 32, 34 by heating the portion 36 (38), and a step (S12) of separating a first member 40 provided on one side of the structure 30 from a second member 42 provided on the other side, with the softened portion 36 (38) sandwiched between them. The step (S11) of softening at least a portion 36 (38) of the resin portion 32, 34 by heating the portion 36 (38) includes a step (S13) of heating the resin portion 32 (34) in which the fastener 44 is embedded, as shown in FIG. The resin portion 32 (34) to be heated is a portion 36 (38) of the resin portion 32 (34) of either the first member 40 or the second member 42 in which the fastener 44 is embedded, and it is not necessary to heat both the first member 40 and the second member 42. In the example shown in Fig. 5, the second member 42 provided on the upper side in the direction of gravity is heated, but it is also possible to heat the first member 40 provided on the lower side.

[0017] In step (S12) of separating the first member 40 provided on one side of the structure 30 from the second member 42 provided on the other side by sandwiching the softened portion 36 (38), the fastener 44 comes out of the resin portion 32 (34) of either the first member 40 or the second member 42 in which the fastener 44 is embedded, and the other of the first member 40 or the second member 42 is separated.

[0018] The step (S12) of separating the first member 40 provided on one side of the structure 30 from the second member 42 provided on the other side by sandwiching the softened portion 36 (38) therebetween may include a step (S14) of lowering the first member 40 by gravity G, as shown in FIG. 6 . If the first member 40 falling due to gravity G is a problem, the first member 40 may be held in advance by a hook, wire, or the like, and then slowly lowered onto land or sea. Alternatively, the first member 40 may be slowly lowered onto land or sea using a wire, rope, or the like installed obliquely relative to the first member 40. In the example shown in FIG. 6 , heating the second member 42 provided on the upper side in the direction of gravity causes the fastener 44 to fall out of the second member 42 and remain in the first member 40 provided on the lower side. However, heating the first member 40 may also cause the fastener 44 to fall out of the first member 40 and remain in the second member 42.

[0019] The step (S11) of softening at least a portion 36 (38) of the resin portion 32 (34) by heating the portion 36 (38) may include a step (S15) of passing an electric current through a heating wire 46 wrapped around at least a portion 36 (38) of the resin portion 32, 34, as shown in FIG. 7.

[0020] The step (S11) of softening at least a portion 36 (38) of the resin portion 32 (34) by heating the portion 36 (38) may include a step (S16) of exposing a portion of the fastener 44 from the resin portions 32, 34, and a step (S17) of passing an electric current through the portion of the fastener 44, as shown in FIG. 8 .

[0021] The step (S11) of softening at least a portion 36 (38) of the resin portion 32 (34) by heating the portion 36 (38) may include a step (S18) of placing a coil 48 (50) close to the fastener 44, and a step (S19) of passing a high-frequency current through the coil 48 (50), as shown in FIG. 9 .

[0022] In step (S18) of placing the coil 48 (50) close to the fastener 44, the coil 48 (50) may be placed on either the inner periphery or the outer periphery of the fastener 44. Note that the coil 48 (50) may be placed on either the inner periphery or the outer periphery of the fastener 44, or may be placed on both the inner periphery and the outer periphery of the fastener 44, as long as the fastener 44 can be heated by electromagnetic induction of the coil 48 (50).

[0023] In the step (S18) of placing the coils 50, 52 close to the fastener 44, the coils 52, 54 may be placed on one side and the other side of the fastener 44 in the extending direction, as shown in FIG.

[0024] According to the method for dismantling a structure 30 according to the second embodiment, the portion 36 (38) of the resin portion 32 (34) in which the fastener 44 is embedded is heated to soften the portion 36 (38) of the resin portion 32 (34), thereby separating the first member 40 from the second member 42. This makes it possible to suppress scattering of dust when separating the first member 40 from the second member 42.

[0025] When the structure 30, which includes at least a resin portion 32 (34), is a structure that extends along the direction of gravity, and the step (S12) of separating one side of the structure 30 from the other side includes the step (S14) of lowering one side by gravity G, it is possible to separate one side from the other side without using heavy machinery, etc.

[0026] When the step (S11) of heating at least a portion 36 (38) of the resin portion 32 (34) to soften the portion 36 (38) includes the step (S15) of passing an electric current through a heating wire 46 wrapped around at least a portion 36 (38) of the resin portion 32, 34, the portion 36 (38) can be heated and softened.

[0027] When the step (S11) of softening at least a portion 36 (38) of the resin portion 32 (34) by heating the portion 36 (38) includes a step (S16) of exposing a portion of the fastener 44 from the portion 36, 38 of the resin portion 32, 34, and a step (S17) of passing an electric current through the portion of the fastener 44, the fastener 44 is heated, and the resin around the fastener 44 can be softened.

[0028] When the step (S11) of softening at least a portion 36 (38) of the resin portion 32 (34) by heating the portion 36 (38) includes the step (S18) of placing a coil 48 (50) close to the fastener 44 and the step (S19) of passing a high-frequency current through the coil 48 (50), the fastener 44 is heated by electromagnetic induction, and the resin around the fastener 44 can be softened.

[0029] When the coil 48 (50) is placed on either the inner or outer circumference of the fastener 44 in step (S18) of placing the coil 48 (50) close to the fastener 44, the fastener 44 is heated by electromagnetic induction, and the resin around the fastener 44 can be softened.

[0030] In step (S18) of placing coils 50, 52 close to fastener 44, if coils 52, 54 are placed on one side and the other side of the extension direction of fastener 44, respectively, fastener 44 is heated by electromagnetic induction, and the resin around fastener 44 can be softened.

[0031] [Method of Dismantling a Meteorological Observation Tower] Fig. 11 is a diagram that schematically shows a meteorological observation tower 60. Fig. 12 is a diagram that schematically shows a method of dismantling the meteorological observation tower 60 shown in Fig. 11. As shown in Fig. 10, the meteorological observation tower 60 includes a foundation 62 and a tower 64 constructed on the foundation 62. The tower 64 is a structure that includes at least a resin portion, and measuring instruments 70, 72 for measuring meteorological parameters (for example, wind direction, wind speed, temperature, air pressure, precipitation, etc.) are installed on each of branch-like protrusions 68 that extend from a tower main body 66.

[0032] 12 , the tower main body 66 includes a first member 82 provided on the sky side with portions 78, 80 of the resin portions 74, 76 sandwiched therebetween, and a second member 84 provided on the ground side and joined to the first member 82. The first member 82 and the second member 84 are fastened together by a metal fastener 86 embedded in the resin portion 78 (80) provided in at least one of the first member 82 and the second member 84. The metal fastener 86 is, for example, a bolt and a nut, and one of them is embedded in the first member 82 and the other is embedded in the second member 84.

[0033] The method for dismantling a meteorological observation tower 60 shown in Figure 12 is a method for dismantling a tower main body 66, in which the measuring instruments 70, 72 installed on each of the branch-like protrusions 68 and the branch-like protrusions 68 are removed before dismantling the tower main body 66. The method for dismantling a meteorological observation tower 60 includes a step (S31) of softening at least a portion 78 (80) of a resin portion 74 (76) of the tower main body 66 by heating the portion 78 (80), and a step (S32) of separating a first member 82 on one side of the tower main body 66 from a second member 84 on the other side, sandwiching the softened portion 78 (80). The step (S31) of softening at least a portion 78 (80) of the resin portion 74 (76) by heating the portion 78 (80) includes a step (S33) of heating the resin portion 78 (80) in which a fastener 86 is embedded. The resin portion 78 (80) to be heated is a portion of the resin portion 78 (80) of either the first member 82 or the second member 84 in which the fastener 86 is embedded, and it is not necessary to heat both the first member 82 and the second member 84. In the example shown in Fig. 12, the first member 82 provided on the upper side in the direction of gravity is heated, but it is also possible to heat the second member 84 provided on the lower side.

[0034] In a step (S32) of separating the first member 82 provided on one side of the tower main body 66 from the second member 84 provided on the other side with the softened portion 78 (80) sandwiched therebetween, for example, but not limited to, lifting the first member 82 from the second member 84 by a crane. In the step (S32) of separating the first member 82 from the second member 84, the fastener 86 comes out of the resin portion 78 (80) of either the first member 82 or the second member 84 in which the fastener 86 is embedded, and the other of the first member 82 or the second member 84 is separated. In the example shown in Figure 12, by heating the first member 82 located on the upper side in the direction of gravity, the fastener 86 comes out of the first member 82 and remains on the second member 84 located on the lower side, but it is also possible to heat the second member 84 and cause the fastener 86 to come out of the second member 84 and remain on the first member 82.

[0035] The step (S31) of softening at least a portion 78 (80) of the resin portion 74 (76) by heating the portion 78 (80) may include a step of passing an electric current through a heating wire wrapped around at least a portion 78 (80) of the resin portion 74 (76), similar to the method of dismantling the structure 30 according to the second embodiment described above.

[0036] The step (S31) of softening at least a portion 78 (80) of the resin portion 74 (76) by heating the portion 78 (80) may include the steps of exposing a portion of the fastener 86 from the resin portions 78, 80 and passing an electric current through a portion of the fastener 86, similar to the method of dismantling the structure 30 according to the second embodiment described above.

[0037] The step (S31) of softening at least a portion 78 (80) of the resin portion 74 (76) by heating the portion 78 (80) may include the steps of placing a coil close to the fastener 86 and passing a high-frequency current through the coil, similar to the method of dismantling the structure 30 according to the second embodiment described above.

[0038] In the step of placing the coil close to the fastener 86, the coil may be placed on either the inner periphery or the outer periphery of the fastener 86, as in the method of dismantling the structure 30 according to the second embodiment described above. Note that as long as the fastener 86 can be heated by electromagnetic induction of the coil, the coil may be placed on either the inner periphery or the outer periphery of the fastener 86, or may be placed on both the inner periphery and the outer periphery of the fastener 86.

[0039] In the step of placing the coil close to the fastener 86, the coils may be placed on one side and the other side of the extension direction of the fastener 86, as in the method of dismantling the structure 30 according to the second embodiment described above.

[0040] 11, the portion 78 (80) of the resin portion 74 (76) in which the fastener 86 is embedded is heated to soften the portion 78 (80) of the resin portion 74 (76), thereby separating the first member 82 from the second member 84. This makes it possible to suppress scattering of dust when separating the first member 82 from the second member 84.

[0041] When the step (S31) of softening at least a portion 78 (80) of the resin portion 74 (76) by heating the portion 78 (80) includes a step of passing an electric current through a heating wire wrapped around at least a portion 78 (80) of the resin portion 74 (76), the resin portion 78 (80) can be heated and softened.

[0042] When the step (S31) of softening at least a portion 78 (80) of the resin portion 74 (76) by heating the portion 78 (80) includes the steps of exposing a portion of the fastener 86 from a portion of the resin portions 74, 76 and passing an electric current through a portion of the fastener 86, the fastener 86 is heated, and the resin portions 78, 80 around the fastener 86 can be softened.

[0043] When the step (S31) of softening at least a portion 78 (80) of the resin portion 74 (76) by heating the portion 78 (80) includes the steps of placing a coil close to the fastener 86 and passing a high-frequency current through the coil, the fastener 86 is heated by electromagnetic induction, and the resin portions 74, 76 around the fastener 86 can be softened.

[0044] If the coil is placed on either the inner or outer circumference of the fastener 86 in the step of placing the coil close to the fastener 86, the fastener 86 is heated by electromagnetic induction, and the resin portions 74, 76 around the fastener 86 can be softened.

[0045] If coils are placed on one side and the other side of the extension direction of fastener 86 in the step of placing coils close to fastener 86, fastener 86 can be heated by electromagnetic induction, softening the resin around fastener 86.

[0046] [Method of Dismantling Wind Turbine] Fig. 13 is a diagram that shows a schematic representation of a wind turbine 100. Fig. 14 is a diagram that shows a schematic representation of a method of dismantling the wind turbine 100 shown in Fig. 13. As shown in Fig. 13, the wind turbine 100 comprises a support and structural section 102, a generator section 104, and a rotor section 106. The support and structural section 102 is made up of a foundation 108, a tower 110, a yaw control section (not shown), etc. The generator section 104 is made up of a drive shaft 112, a gearbox 114, a generator 116, control equipment (not shown), etc., and is housed in a housing 118 called a nacelle. The rotor section 106 is made up of wind turbine blades 120, a rotor head 122, etc.

[0047] 13 , the wind turbine blade 120 includes a first member 132 provided on the tip side with portions 128, 130 of the resin portions 124, 126 sandwiched therebetween, and a second member 134 provided on the rotor head 122 side and joined to the first member 132. The first member 132 and the second member 134 are fastened together by a metal fastener 136 embedded in the resin portions 128, 130 provided on at least one of the first member 132 and the second member 134. The metal fastener 136 is, for example, a bolt and a nut, and one of them is embedded in the first member 132 and the other is embedded in the second member 134.

[0048] The method for dismantling the wind turbine 100 shown in Fig. 14 is a method for dismantling the wind turbine blades 120, and the yaw control device and the control device are removed before dismantling the wind turbine blades 120. As shown in Fig. 14, the method for dismantling the wind turbine 100 involves sequentially dismantling multiple (three) wind turbine blades 120, and the wind turbine blades 120 to be dismantled are fixed by rotating them so that they are aligned with the direction of gravity.

[0049] The method for dismantling the wind turbine 100 includes a step (S51) of softening at least a portion 130 (128) of a resin portion 126 (124) of a wind turbine blade 120 by heating the portion 130 (128), and a step (S52) of separating a first member 132 provided on the tip side of the wind turbine blade 120 with the softened portion 130 (128) sandwiched between them, from a second member 134 provided on the rotor head 122 side. The step (S51) of softening at least a portion 130 (128) of the resin portion 126 (124) by heating the portion 130 (128) includes a step (S53) of heating the resin portion 130 (128) in which a fastener 136 is embedded. It should be noted that the resin portion 130 (128) to be heated is a portion 130 (128) of the resin portion 126 (124) of either the first member 132 or the second member 134 in which the fastener 136 is embedded, and it is not necessary to heat both the first member 132 and the second member 134. In the example shown in Fig. 14, the portion 130 of the resin portion 126 of the second member 134 provided on the upper side in the direction of gravity is heated, but it is also possible to heat the portion 128 of the resin portion 124 of the first member 132 provided on the lower side.

[0050] In step (S52) of separating the first member 132 provided on the tip side of the wind turbine blade 120 from the second member 134 provided on the rotor head 122 side by sandwiching the softened portion 130 (128), the fastener 136 comes out of the resin portion 130 (128) of either the first member 132 or the second member 134 in which the fastener 136 is embedded, and the other of the first member 132 or the second member 134 is separated.

[0051] The step (S52) of separating the first member 132 provided on the tip side of the wind turbine blade 120 from the second member 134 provided on the rotor head 122 side by sandwiching the softened portion 130 (128) therebetween may include a step of lowering the first member 132 by gravity G, as in the dismantling method of the structure 30 according to the second embodiment described above. If the first member 132 falling due to gravity G is a problem, the first member 132 may be held in advance by a hook, a wire, or the like, and then slowly lowered onto the ground or the sea. Alternatively, the first member 132 may be slowly lowered onto the ground or the sea by a wire, rope, or the like installed obliquely relative to the first member 132. In the example shown in Figure 14, by heating a portion 130 of the resin portion 126 of the second member 134 located on the upper side in the direction of gravity, the fastener 136 falls out of the second member 134 and remains in the first member 132 located on the lower side; however, by heating a portion 128 of the resin portion 124 of the first member 132, the fastener 136 may fall out of the first member 132 and remain in the second member 134.

[0052] The step (S52) of softening at least a portion 130 (128) of the resin portion 126 (124) by heating the portion 130 (128) may include a step of passing an electric current through a heating wire wrapped around at least a portion 130 (128) of the resin portion 126 (124), similar to the method of dismantling the structure 30 according to the second embodiment described above.

[0053] The step (S52) of softening at least a portion 130 (128) of the resin portion 126 (124) by heating the portion 130 (128) may include the steps of exposing a portion of the fastener 136 from the resin portions 128, 130 and passing an electric current through the portion of the fastener 136.

[0054] The step (S52) of softening at least a portion 130 (128) of the resin portion 126 (124) by heating the portion 130 (128) may include the steps of placing a coil close to the fastener 136 and passing a high-frequency current through the coil, similar to the method of dismantling the structure 30 according to the second embodiment described above.

[0055] In the step of placing the coil close to the fastener 136, for example, the coil may be placed on either the inner periphery or the outer periphery of the fastener 136. Note that as long as the fastener 136 can be heated by electromagnetic induction of the coil, the coil may be placed on either the inner periphery or the outer periphery of the fastener 136, or may be placed on both the inner periphery and the outer periphery of the fastener 136.

[0056] In the step of placing the coil close to the fastener 136, the coils may be placed on both sides of the fastener 136 in the extension direction.

[0057] 13 , by heating the portions 130 (128) of the resin portions 124, 126 in which the fasteners 136 are embedded, the portions 130 (128) of the resin portions 124, 126 are softened, and the first member 132 is separated from the second member 134. This makes it possible to suppress scattering of dust when the first member 132 is separated from the second member 134.

[0058] When the wind turbine blade 120, which includes at least a portion of resin parts 124, 126, is a wind turbine blade that extends along the direction of gravity, and the step (S52) of separating the first member 132 provided on the tip side of the wind turbine blade 120 from the second member 134 provided on the rotor head 122 side includes a step of lowering the first member 132 by gravity G, the first member 132 can be separated from the second member 134 without using heavy machinery or the like.

[0059] When the step (S51) of softening at least a portion 130 (128) of the resin portion 124, 126 by heating the portion 130 (128) includes a step of passing an electric current through a heating wire wrapped around at least a portion 130 (128) of the resin portion 124, 126, the resin portion 130 (128) can be heated and softened.

[0060] When the step (S51) of softening at least a portion 130 (128) of the resin portion 124, 126 by heating the portion 130 (128) includes the steps of exposing a portion of the fastener 136 from the portion 128, 130 of the resin portion 124, 126 and passing an electric current through the portion of the fastener 136, the fastener 136 is heated, and the resin portion 128, 130 around the fastener 136 can be softened.

[0061] When the step (S51) of softening at least a portion 130 (128) of the resin portion 124, 126 by heating the portion 130 (128) includes the steps of placing a coil close to the fastener 136 and passing a high-frequency current through the coil, the fastener 136 is heated by electromagnetic induction, and the resin portion 130 (128) around the fastener 136 can be softened.

[0062] If the coil is placed on either the inner or outer circumference of the fastener 136 in the step of placing the coil close to the fastener 136, the fastener 136 is heated by electromagnetic induction, and the resin portion 130 (128) around the fastener 136 can be softened.

[0063] If coils are placed on one side and the other side of the extension direction of fastener 136 in the step of placing the coil close to fastener 136, fastener 136 is heated by electromagnetic induction, and the resin portion 130 (128) around fastener 136 can be softened.

[0064] The contents described in the above embodiment can be understood, for example, as follows.

[0065] [1] A method for dismantling a structure according to one embodiment is a method for dismantling a structure (10) including at least a resin portion (12), and includes a step (S1) of softening at least a portion (14) of the resin portion (12) by heating the portion (14), and a step (S2) of separating a portion (16) on one side of the structure (10) from a portion (18) on the other side by sandwiching the softened portion (14).

[0066] According to the method for dismantling a structure (10) disclosed herein, at least a portion (14) of a resin portion (12) of the structure (10) is heated to soften the portion (14), and the portion (16) on one side of the structure (10) is separated from the portion (18) on the other side by sandwiching the softened portion (14), thereby making it possible to suppress the scattering of dust when the structure (10) is dismantled.

[0067] [2] Another aspect of the method for dismantling a structure is the method of [1] above, wherein the structure (30) at least partially including a resin portion (32 (34)) includes a first member (40) provided on the one side and a second member (42) provided on the other side and joined to the first member (40), the first member (40) and the second member (42) are fastened together by a metal fastener (44) embedded in the resin portion (36 (38)) provided on at least one of the first member (40) and the second member (42), and the step (S11) of softening the portion includes a step (S13) of heating the resin portion (36 (38)) in which the fastener (44) is embedded.

[0068] According to this method, the resin portion (36 (38)) in which the fastener (44) is embedded is heated to soften the resin portion (36 (38)), and the first member (40) is separated from the second member (42). This makes it possible to suppress scattering of dust when separating the first portion (40) from the second member (42).

[0069] [3] In yet another aspect of the method for dismantling a structure, in the method [1] or [2] above, the structure (30) at least partially including a resin portion (32 (34)) is a structure extending along the direction of gravity, and the step (S12) of separating one side of the structure (30) from the other side includes a step (S14) of lowering the one side by gravity (G).

[0070] According to this method, one side is lowered by gravity (G), so that one side can be separated from the other side without using heavy machinery or the like.

[0071] [4] In yet another aspect of the method for dismantling a structure, in any one of the methods [1] to [3] above, the step (S11) of softening the portion (36 (38)) includes a step (S15) of passing an electric current through an electric heating wire (46) wrapped around the resin portion (36 (38)).

[0072] According to this method, by passing an electric current through the heating wire (46) wrapped around the resin portion (36 (38)), the resin portion (36 (38)) can be heated and softened.

[0073] [5] In yet another aspect of the method for dismantling a structure, in the method [2] above, the step (S11) of heating the resin portions (36, 38) includes a step (S17) of exposing a portion of the fastener (44) from the resin portions (36, 38) and a step (S17) of passing an electric current through the portion of the fastener (44).

[0074] According to this method, a portion of the fastener (44) is exposed from the resin portions (36, 38) and an electric current is passed through the portion of the fastener (44), thereby heating the fastener (44) and softening the resin around the fastener (44).

[0075] [6] In yet another aspect of the method for dismantling a structure, in the method [2] above, the step (S11) of heating the resin portion (36 (38)) includes a step (S18) of placing a coil (48 (50)) close to the fastener (44), and a step (S19) of passing a high-frequency current through the coil (48 (50)).

[0076] According to this method, a coil (48 (50)) is placed close to the fastener (44) and a high-frequency current is passed through the coil (48 (50)), so that the fastener (44) is heated by electromagnetic induction and the resin around the fastener (44) can be softened.

[0077] [7] In yet another aspect of the method for dismantling a structure, in the method [6] above, in the step (S18) of placing the coil (48 (50)) close to the fastener (44), the coil (48 (50)) is placed on the inner or outer circumference of the fastener (44).

[0078] According to this method, a coil (48 (50)) is placed on the outer or inner periphery of the fastener (44), so that the fastener (44) is heated by electromagnetic induction, and the resin around the fastener (44) can be softened.

[0079] [8] In yet another aspect of the method for dismantling a structure, in the method [6] above, in the step (S18) of placing the coils (50 (52)) close to each other, the coils (50 (52)) are placed on one side and the other side of the extension direction of the fastener (44).

[0080] According to this method, coils (50 (52)) are installed on one side and the other side of the extension direction of the fastener (44), so that the fastener (44) is heated by electromagnetic induction and the resin around the fastener (44) can be softened.

[0081] REFERENCE SIGNS LIST 10 Structure 12 Resin part 14 Portion of resin part 16 Portion that will become one side of the structure 18 Portion that will become the other side of the structure 20 Heating wire 30 Structure 32, 34 Resin part 36, 38 Portion of resin part 40 First member 42 Second member 44 Fastener 46 Heating wire 48, 50 Coil 52, 54 Coil 60 Meteorological observation tower 62 Foundation 64 Tower 66 Tower body 68 Protrusion 70, 72 Measuring instrument 74, 76 Resin part 78, 80 Portion of resin part 82 First member 84 Second member 86 Fastener 100 Wind turbine 102 Support / structural part 104 Generator part 106 Rotor part 108 Foundation 110 Tower 112 Drive shaft 114 Reducer 116: Generator 118: Housing 120: Wind turbine blade 122: Rotor head 124, 126: Resin part 128, 130: Part of the resin part 132: First member 134: Second member 136: Fastener

Claims

1. A method for disassembling a structure including a resin part at least in part, comprising: The structure including a resin part at least in part includes a first member provided on one side of the structure sandwiching at least a part of the resin part, and a second member provided on the other side of the structure and joined to the first member. The first member and the second member are fastened by a metal fastener embedded in the resin part provided on at least one of the first member and the second member. Softening at least a part of the resin part by heating at least a part of the resin part. Separating a part on one side of the structure from a part on the other side with the softened part sandwiched therebetween. And having The step of softening at least a part includes the step of heating the resin part in which the fastener is embedded. A method for disassembling a structure.

2. The structure including a resin part at least in part is a structure extending along the gravitational direction, The method for disassembling a structure according to claim 1, wherein the step of separating one side of the structure from the other side includes the step of lowering one side by gravity.

3. The method for disassembling a structure according to claim 1 or 2, wherein the step of softening at least a part includes the step of passing an electric current through a heating wire wound around the resin part.

4. The step of heating the resin part includes Exposing a part of the fastener from the resin part. Passing an electric current from a part of the fastener. And the method for disassembling a structure according to claim 1 or 2.

5. The step of heating the resin part includes Placing a coil close to the fastener. Passing a high-frequency electric current through the coil. And the method for disassembling a structure according to claim 1 or 2.

6. In the step of placing the coil close to the fastener, Placing the coil on the inner circumference or outer circumference of the fastener. The method for disassembling a structure according to claim 5.

7. In the step of placing the coil close to the fastener, Placing coils on one side and the other side in the extending direction of the fastener respectively. The method for disassembling a structure according to claim 5.