Dismantling method

Abstract

To provide a holding device and a disassembling method capable of cutting off an aquatic structure from a water bottom and disassembling it without damaging the surroundings and without scattering or spilling a contaminant stuck to or included in the aquatic structure into water.SOLUTION: This holding device for holding an aquatic structure 200 of a fixed-bottom type extending from a water bottom toward on-water comprises: a floating body structure 110 floating on water; a holding mechanism 120 for holding the aquatic structure 200; and a support mechanism 130 installed on the floating body structure 110 to support the holding mechanism 120 rotatably about an axis X. The holding mechanism 120 rotates so as to tilt the aquatic structure 200.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a retaining device and a dismantling method for a floating structure. [Background technology]

[0002] For example, when demolishing a land-based structure that extends vertically, such as a tower-type structure, a low-cost demolition method that avoids working at height as much as possible is to cut the base of the structure, topple it, and then demolish it (see, for example, Patent Document 1). The structure is cut using, for example, blasting or other mechanical cutting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4828314 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if this type of demolition method is applied to a bottom-mounted floating structure, (1) when the structure collapses, waves may be created on the water surface, posing a danger to nearby ships and other vessels, (2) when and after the structure collapses, contaminants attached to the structure (debris, dust, oil, etc.) or contained in the structure may be scattered or washed out into the water, causing pollution, and (3) there is a possibility that the collapsed structure will sink into the water and become impossible to recover.

[0005] The present disclosure has been made in consideration of these circumstances, and aims to provide a holding device and a dismantling method that can detach an underwater structure from the bottom of the water and then dismantle it without causing harm to the surrounding area and without scattering or discharging pollutants attached to or contained in the underwater structure into the water. [Means for solving the problem]

[0006] In order to solve the above problems, the holding device and disassembly method of the present disclosure employ the following measures. In other words, a holding device according to one aspect of the present disclosure is a holding device for holding a bottom-mounted floating structure extending from the bottom of the water toward the surface of the water, and comprises a floating body portion that floats on the water, a holding portion that holds the floating structure, and a support portion that is installed on the floating body portion and supports the holding portion so that it can rotate freely around an axis, and the holding portion rotates so that the floating structure tilts.

[0007] In addition, a dismantling method according to one aspect of the present disclosure is a method for dismantling a bottom-mounted floating structure using a holding device comprising a floating body portion that floats on the water, a holding portion that holds the floating structure, and a support portion that is installed on the floating body portion and supports the holding portion so that it can rotate freely around an axis, and includes a holding step of holding the floating structure with the holding portion, a cutting step of detaching the floating structure held by the holding portion from the bottom of the water, and a tilting step of rotating the holding portion, which holds the floating structure detached from the bottom of the water, around the axis on the floating body portion, to tilt the floating structure. [Effects of the Invention]

[0008] According to the present disclosure, an underwater structure can be detached from the bottom of the water and then dismantled without causing harm to the surrounding area and without causing pollutants attached to or contained in the underwater structure to scatter or flow into the water. [Brief explanation of the drawings]

[0009] [Figure 1] This is a diagram showing the floating structure before and after removal. [Figure 2] 1 is a side view showing a state before a tilting step in a holding device according to a first embodiment of the present invention. [Figure 3] 1 is a plan view showing a state before a tilting step in a holding device according to a first embodiment of the present invention. FIG. [Figure 4] 1 is a side view showing a state during a tilting process of the holding device according to the first embodiment of the present invention. FIG. [Figure 5] FIG. 3 is a side view showing the holding device according to the first embodiment of the present invention in a state after a tilting step. [Figure 6] FIG. 10 is a side view showing a state during a holding process in a holding device according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a plan view showing a state during a holding process in a holding device according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a side view showing a state during a cutting operation in a holding device according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a plan view showing a state during a cutting operation in a holding device according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a side view showing a state before a tilting step in a holding device according to a third embodiment of the present invention. [Figure 11] FIG. 10 is a plan view showing a state before a tilting step in a holding device according to a third embodiment of the present invention. [Figure 12] FIG. 10 is a side view showing a state during a tilting process in a holding device according to a fourth embodiment of the present invention. [Figure 13] FIG. 10 is a partially enlarged view of the vicinity of a weight in a holding device according to a fourth embodiment of the present invention. [Figure 14] FIG. 11 is a side view showing a state during a tilting process in a holding device according to a fifth embodiment of the present invention. [Figure 15] FIG. 11 is a side view showing a state after a tilting step in a holding device according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] As shown in FIG. 1, the holding device and dismantling method according to each embodiment of the present disclosure are devices and methods used when dismantling an offshore structure 200. Note that "dismantling" here does not mean the work of dismantling the floating structure 200 itself, but rather the work of detaching the floating structure 200 from the bottom 303 and bringing it to a state where it can be moved from its installed location.

[0011] The floating structure 200 is a bottom-mounted structure that extends from the bottom 303 toward the water surface when installed on the bottom 303 of the water. Specifically, the floating structure 200 is a bottom-mounted structure that extends vertically (i.e., has its longitudinal direction in the vertical direction) when installed on the water bottom 303. Examples of the floating structure 200 include a meteorological observation tower, a leg structure of an offshore facility, a lighthouse, a power transmission tower, and a wind turbine for generating electricity.

[0012] The floating structure 200 has a foundation 210 and a structure body 220 .

[0013] The foundation 210 extends vertically, with its lower portion driven into the water bottom 303. In addition to the illustrated monopile type, the foundation 210 may be of a jacket type, tripod type, tripile type, or the like, and the specific form of the structure is not limited as long as it is a bottom-mounted type.

[0014] The structure main body 220 is provided on top of the foundation 210 in the vertical direction, and a portion including the upper end thereof appears above the water surface 301 . The structure main body 220 is the part that performs the substantial functions of the floating structure 200. Since the structure main body 220 includes the equipment necessary to perform its functions, the weight of the structure main body 220 is often heavier than the weight of the foundation 210.

[0015] In the floating structure 200, the boundary between the foundation 210 and the structure main body 220 does not need to be clearly defined.

[0016] The holding device and the disassembly method will be specifically described below using several embodiments as examples.

[0017] [First embodiment] A holding device and a disassembly method according to a first embodiment of the present disclosure will be described with reference to FIGS. 2 to 5. FIG.

[0018] <Holding device> As shown in FIGS. 2 and 3, the holding device 101 includes a floating structure (floating body portion) 110, a holding mechanism (holding portion) 120, and a support mechanism (supporting portion) .

[0019] The floating structure 110 is a part that floats on the water (on the water) due to buoyancy. The floating structure 110 is designed to generate buoyancy that will not sink even when the entire weight of the dismantled floating structure 200 is added to it.

[0020] 3, the floating structure 110 has a recess 111 extending in a predetermined direction. In plan view, the floating structure 110 has a U-shape due to the recess 111. As shown in FIGS. 2 and 3, the recess 111 is a space or gap into which the floating structure 200 and the holding mechanism 120 fit when the floating structure 200 is dismantled. The floating structure 110 is not limited to the above-mentioned shape (U-shape). For example, the floating structure 110 may be provided with a mechanism capable of opening and closing the opening of the recess 111, and the shape may be changed in such a way that the opening of the recess 111 is closed while the floating structure 110 is moving and the opening is opened when the floating structure 200 is tilted.

[0021] Two support mechanisms 130 are installed on the upper surface of the floating structure 110. The two support mechanisms 130 are installed so as to face each other with the recess 111 in between. The support mechanism 130 is a part that rotatably supports the support shaft 121a of the holding mechanism 120.

[0022] The holding mechanism 120 is a part that holds and grips the floating structure 200. As shown in FIG. 3, the holding mechanism 120 is disposed between opposing support mechanisms 130 . As shown in FIGS. 2 and 3, the holding mechanism 120 includes a rotating part 121 and a holding arm 122.

[0023] The rotating part 121 is an elongated structure extending in a predetermined direction. The rotating part 121 has a support shaft 121a having a rotation axis (axis) X along the horizontal direction. The support shaft 121a protrudes from both sides of the rotating part 121. A support shaft 121a of the rotating part 121 is supported by the support mechanism 130. As a result, the rotating part 121, and in turn the holding mechanism 120, is supported by the support mechanism 130 so as to be rotatable.

[0024] The holding arm 122 is a mechanism for holding and gripping the floating structure 200 . The holding arms 122 are provided at multiple locations along the extension direction of the rotating part 121. This allows the long floating structure 200 to be stably held at multiple locations. In the case of Figure 2, a total of three holding arms 122 are provided, two of which hold the structure main body 220 and one of which holds the foundation 210. The holding arm 122 and the rotating part 121 may be configured so that the holding arm 122 moves in the extending direction of the rotating part 121 according to the dimensions (height) of the floating structure 200.

[0025] As shown in Figure 2, when the holding mechanism 120 holds / is holding the floating structure 200, the extension direction of the holding mechanism 120 (i.e., the extension direction of the rotating part 121) coincides with the extension direction of the floating structure 200.

[0026] For example, when the holding mechanism 120 holds / is holding an offshore structure 200 that is driven into the bottom 303 and extends vertically, the extension direction of the holding mechanism 120 coincides with the vertical direction, just like the offshore structure 200. At this time, the holding mechanism 120 is disposed between the support mechanisms 130 and the lower portion thereof is inserted into the recess 111 .

[0027] On the other hand, when the holding mechanism 120 does not hold the floating structure 200, the extension direction of the holding mechanism 120 does not have to coincide with the extension direction of the floating structure 200, and for example, the holding mechanism 120 may be positioned so that the extension direction coincides with the horizontal direction. The holding mechanism 120 does not hold the floating structure 200 when, for example, the holding device 101 is moved to the vicinity of the floating structure 200 before the start of dismantling work.

[0028] In the holding device 101 configured as above, the holding mechanism 120 supported by the support mechanism 130 is rotated around the rotation axis X of the support shaft 121a by a drive unit (not shown). The drive unit is composed of, for example, an electric motor and a reducer including a plurality of gears.

[0029] <Disassembly method> First, as shown in FIGS. 2 and 3, the holding device 101 is moved so that the floating structure 200 enters the recess 111 of the floating structure 110. The holding device 101 can be moved, for example, by being towed by a ship. Alternatively, the holding device 101 itself can be provided with power to make it self-propelled.

[0030] Next, the angle of the holding mechanism 120 is adjusted so that the extension direction of the holding mechanism 120 coincides with the extension direction of the floating structure 200. The angle is adjusted, for example, by using the drive unit described above.

[0031] Next, the floating structure 200 is held by the holding arms 122 of the holding mechanism 120 (holding step).

[0032] Next, as shown in FIG. 2, cutting work of the foundation 210 of the floating structure 200 begins. When cutting, measures to prevent contamination may be taken, such as covering the portion of the base 210 including the cut surface 211 with a cover.

[0033] It is desirable that the position of the cutting surface 211 be as close to the bottom 303 of the water as possible. The reason for this is as follows: Usually, the weight of the structure main body 220 is often heavier than the weight of the foundation 210, and the position of the center of gravity G of the floating structure 200 tends to be located above the rotation axis X in the vertical direction. For this reason, in order to bring the position of the center of gravity G of the floating structure 200 after it has been separated from the water bottom 303 as close as possible to the rotation axis X, thereby reducing the torque required to rotate the holding mechanism 120, the position of the cutting surface 211 has been devised.

[0034] It is also possible to start cutting the foundation 210 before the holding step, and hold the floating structure 200 with the holding mechanism 120 during the cutting work. In short, it is sufficient to hold the floating structure 200 with the holding mechanism 120 before the floating structure 200 is completely separated from the water bottom 303.

[0035] Next, the cutting operation of the underwater structure 200 is completed, and the underwater structure 200 held by the holding mechanism 120 is completely separated from the water bottom 303 (cutting process). As a result, the system of the holding device 101 holding the underwater structure 200 becomes completely independent from the water bottom 303.

[0036] Next, as shown in Figure 4, the holding mechanism 120 is rotated using a drive unit (not shown) to tilt the floating structure 200 in a direction such that the cut end of the floating structure 200 passes through the recess 111 (in the direction in which the cut end bounces up) (tilting process). At this time, in order to tilt the floating structure 200 safely, it is preferable to rotate the holding mechanism 120 at a low speed by the drive unit.

[0037] Finally, as shown in FIG. 5, the floating structure 200 is tilted until it is placed on the floating structure 110 with its extension direction aligned with the horizontal direction.

[0038] When the floating structure 200 is in a state of being laid on its side, the system of the support device 101 including the floating structure 200 is completely independent from the bottom 303, so that the floating structure 200 can be moved together with the support device 101 to the vicinity of land. Then, the floating structure 200 placed on the holding device 101 can be pulled onto land by, for example, a crane installed on land, thereby allowing the floating structure 200 to be safely disassembled on land.

[0039] According to this embodiment, the following effects are achieved. That is, the holding device 101 comprises a floating structure 110 that floats on the water, a holding mechanism 120 that holds the floating structure 200, and a support mechanism 130 that is installed on the floating structure 110 and supports the holding mechanism 120 so that it can rotate freely around an axis, and the holding mechanism 120 rotates so that the floating structure 200 tilts, so that, for example, the floating structure 200 extending vertically can be detached from the water bottom 303 while held by the holding mechanism 120 and laid sideways on the floating structure 110. Therefore, the underwater structure 200 can be detached from the water bottom 303 in a stable state, and the detached underwater structure 200 can be safely tilted and laid on its side on the floating structure 110. Also, for example, by placing the underwater structure 200 on the floating structure 110 in an laid-down state, the underwater structure 200 can be moved to land in a stable state and then disassembled on land. This allows the floating structure 200 to be detached from the bottom 303 and then disassembled without causing harm to surrounding ships or other vessels, and without causing pollutants attached to or contained in the floating structure 200 to scatter or flow into the water.

[0040] Furthermore, if the holding device 101 is equipped with a drive unit that rotates the holding mechanism 120 that is axially supported on the support mechanism 130, the holding mechanism 120 that holds the above-water structure 200 that has been detached from the waterbed 303 can be freely rotated around an axis.

[0041] [Second embodiment] Next, a holding device and a disassembly method according to a second embodiment of the present disclosure will be described with reference to FIGS. The holding device and dismantling method according to this embodiment are different from those of the first embodiment in the structure of the floating structure 110 and the structure of the support mechanism 130, but are otherwise the same. Therefore, the same components are denoted by the same reference numerals and their description will be omitted. Moreover, the holding device designated by reference numeral 101 in the first embodiment is designated by reference numeral 102 in this embodiment.

[0042] <Holding device> As shown in FIGS. 6 to 9, in the holding device 102, the support mechanism 130 is configured to be able to temporarily release the support of the support shaft 121a. The configuration will be described in detail below.

[0043] 6 and 7, wheels 132 are provided on the lower part of the support mechanism 130. Furthermore, two rails 112 are laid on the floating structure 110 in parallel. The support mechanism 130 is mounted on the floating structure 110 so as to be movable along the rails 112 via wheels 132 .

[0044] The support mechanism 130 has a support notch 131 formed therein. The support notch 131 is a U-shaped notch extending horizontally, and the semicircular arc-shaped end portion corresponds to the shape of the support shaft 121a.

[0045] When the support shaft 121a is held by the support notch 131, the support mechanism 130 supports the support shaft 121a.

[0046] As shown in FIGS. 8 and 9, when the support mechanism 130 is moved along the rail 112, the support notch 131 moves and the support shaft 121a comes out of the support notch 131. As a result, the support mechanism 130 releases the support of the support shaft 121a, that is, the support mechanism 130 and the holding mechanism 120 are mechanically separated from each other.

[0047] When the support mechanism 130 and the holding mechanism 120 are mechanically separated, the system of the holding mechanism 120 that holds the floating structure 200 becomes independent from the system of the floating structure 110 including the support mechanism 130. This makes it possible to prevent the rocking of the floating structure 110 from being transmitted to the holding mechanism 120 and prevent the vibration of the holding mechanism 120 from being transmitted to the floating structure 110.

[0048] It should be noted that a buffer member 113 protruding toward the holding mechanism 120 (rotating portion 121) may be provided on each of the inner circumferential surfaces (three surfaces) of the recess 111. Examples of materials for the buffer member 113 include rubber materials such as chloroprene, and commercially available materials for fenders can be used. Mechanical shock absorbing means such as hydraulic dampers and metal springs can also be used, or can be used in combination with the buffer member 113.

[0049] The buffer member 113 is provided with a small gap between it and the rotating part 121 or is provided so as to be in light contact with the rotating part 121 . As a result, even after the support mechanism 130 releases the support shaft 121a, the system of the holding mechanism 120 is softly moored to the system of the floating structure 110. Therefore, it is possible to prevent the system of the holding mechanism 120 and the system of the floating structure 110 from easily separating and drifting apart due to the influence of wind or waves, for example. Furthermore, vibrations between the systems are reduced by the buffer member 113.

[0050] <Disassembly method> 6 and 7, the steps up to the holding step are the same as those in the first embodiment. As a result, the floating structure 200 is fixed to the holding mechanism 120.

[0051] Next, as shown in FIGS. 8 and 9, the support mechanism 130 is moved along the rail 112 to release the pivotal support of the holding mechanism 120.

[0052] Next, cutting work of the foundation 210 of the floating structure 200 begins. At this time, the system of the holding mechanism 120 that holds the floating structure 200 and the system of the floating structure 110 including the support mechanism 130 are independent, so the rocking of the floating structure 110 is not transmitted to the holding mechanism 120, and the vibration of the holding mechanism 120 is not transmitted to the floating structure 110. This allows the cutting work of the foundation 210 to be carried out safely.

[0053] As the cutting operation progresses and the floating structure 200 is about to be completely separated from the seabed 303, confirm that the rocking of the floating structure 110 is small enough not to affect the cutting operation, and then move the support mechanism 130 along the rail 112 to pivotally support the holding mechanism 120, as shown in Figures 6 and 7.

[0054] Next, the cutting operation of the underwater structure 200 is completed, and the underwater structure 200 held by the holding mechanism 120 is completely separated from the water bottom 303 (cutting process). As a result, the system of the holding device 101 holding the underwater structure 200 becomes completely independent from the water bottom 303.

[0055] The steps after the cutting step are the same as those in the first embodiment, and therefore the description thereof will be omitted.

[0056] According to this embodiment, the following effects are achieved. That is, the support mechanism 130 can release the pivotal support of the holding mechanism 120 to separate the holding mechanism 120, thereby temporarily releasing the mechanical connection between the floating structure 110 and the holding mechanism 120. This makes it possible to prevent the swinging of the floating structure 110 from being transmitted to the holding mechanism 120. Therefore, the floating structure 200 can be safely separated from the water bottom.

[0057] [Third embodiment] Next, a holding device and a disassembly method according to a third embodiment of the present disclosure will be described with reference to FIGS. The holding device and dismantling method according to this embodiment are the same as those of the first and second embodiments except for the inclusion of a winch (pulling means) 140. Therefore, the same components are denoted by the same reference numerals and their description will be omitted. Moreover, the holding device designated by reference numeral 101 in the first embodiment is designated by reference numeral 103 in this embodiment.

[0058] As shown in FIGS. 10 and 11, the holding device 103 includes a winch 140 having a winch body 141 and a wire 142 .

[0059] The winch body 141 is a part that pulls out / winds the wire 142. The winch body 141 is installed on the upper surface of the floating structure 110. The two winch bodies 141 are installed on the tip side of the floating structure 110 so as to face each other with the recess 111 in between.

[0060] One end of the wire 142 is connected to the winch body 141 . The other end of the wire 142 is connected to a connection point 121b of the rotating part 121. When the holding mechanism 120 extends in the vertical direction, the connection point 121b is located vertically above the support shaft 121a.

[0061] A pulley 143 whose position is fixed relative to the floating structure 110 is installed between the winch body 141 and the connection point 121b and above the connection point 121b in the vertical direction. A wire 142 is hung on the pulley 143. That is, the wire 142 exerts tension between the winch body 141 and the rotating part 121 with the pulley 143 at its top.

[0062] According to this embodiment, the following effects are achieved. That is, since the holding device 103 is equipped with a winch 140, it is possible to slow down the rotation speed of the holding mechanism 120 and reduce the output of the drive unit (not shown) required to rotate the holding mechanism 120.

[0063] It is also possible to omit the drive unit and change the attitude of the holding mechanism 120 using only the winch 140.

[0064] [Fourth embodiment] Next, a holding device and a disassembling method according to a fourth embodiment of the present disclosure will be described with reference to FIGS. The holding device and disassembly method according to this embodiment are the same as those of the first to third embodiments except for the inclusion of a weight 150. Therefore, the same components are denoted by the same reference numerals and their description will be omitted. Moreover, the holding device designated by reference numeral 101 in the first embodiment is designated by reference numeral 104 in this embodiment.

[0065] As shown in FIGS. 12 and 13, the retention device 104 includes a weight 150 having a ballast tank portion 151 .

[0066] The weight 150 is installed at the end of the rotating part 121 located on the foundation 210 side of the floating structure 200.

[0067] As shown in FIG. 13, the ballast tank section 151 has a space formed therein, and is configured so that water can be poured into and discharged from the space. The water is poured into and drained from the sinker 150 by a pump (not shown), for example, which allows the weight of the sinker 150 to be changed.

[0068] The portion of the weight 150 other than the ballast tank portion 151 may be a simple mass (for example, a lump of concrete or metal).

[0069] In addition, it is preferable that the ballast tank section 151 is installed so that it faces vertically upward as the floating structure 200 tilts.

[0070] Furthermore, instead of using a pump (not shown), water may be naturally discharged from the ballast tank section 151. Specifically, a drain outlet may be provided in the ballast tank section 151, and water may flow out of the drain outlet naturally as the floating structure 200 tilts.

[0071] According to this embodiment, the following effects are achieved. That is, the holding device 104 is provided with a weight 150 attached to the holding mechanism 120, and therefore it is possible to adjust the position of the combined center of gravity of the floating structure 200 and the holding mechanism 120. This allows the floating structure 200 to be tilted stably.

[0072] Furthermore, since the weight of the sinker 150 can be changed by injecting and discharging water, the position of the composite center of gravity can be instantly adjusted when tilting the floating structure 200. This allows the floating structure 200 to be tilted stably.

[0073] Furthermore, the rotation speed of the holding mechanism 120 can be slowed down, and the output of a drive unit (not shown) required to rotate the holding mechanism 120 can be reduced.

[0074] The weight 150 may be attached to the floating structure 200 (for example, the end of the foundation 210) instead of the rotating part 121, or may be attached to both.

[0075] [Fifth embodiment] Next, a holding device and a disassembling method according to a fifth embodiment of the present disclosure will be described with reference to FIGS. The holding device and disassembly method according to this embodiment are the same as those of the first to fourth embodiments except for the configuration of the holding mechanism 120. Therefore, the same components are denoted by the same reference numerals and their description will be omitted. Moreover, the holding device designated by reference numeral 101 in the first embodiment is designated by reference numeral 105 in this embodiment.

[0076] <Holding device> As shown in FIG. 14, the holding mechanism 120 of the holding device 105 has a sliding part 123 in addition to a rotating part 121 and a holding arm 122 .

[0077] As in the first to fourth embodiments, the rotating part 121 is an elongated structure extending in a predetermined direction. However, unlike the first to fourth embodiments, the holding arm 122 is not directly installed on the rotating part 121.

[0078] The sliding portion 123 is an elongated structure that extends in the same direction as the rotating portion 121 . The sliding portion 123 is supported by the rotating portion 121 so as to be slidable along the extending direction of the rotating portion 121 .

[0079] The holding arms 122 are provided at multiple locations along the extension direction of the sliding portion 123. This allows the long floating structure 200 to be stably held at multiple locations. In the case of Figure 14, a total of three holding arms 122 are provided, two of which hold the structure main body 220 and one of which holds the foundation 210.

[0080] <Disassembly method> The steps up to the cutting step are the same as those in the first embodiment, and therefore the description thereof will be omitted.

[0081] 14 and 15, in the tilting process, the sliding part 123 is slid relative to the rotating part 121 so that the center of gravity G of the floating structure 200 separated from the water bottom is positioned directly above the support shaft 121a. In the case of the figures, in the holding mechanism 120 during tilting, the sliding part 123 is slid toward the water bottom 303.

[0082] According to this embodiment, the following effects are achieved. That is, the holding mechanism 120 of the holding device 105 has the sliding part 123 in addition to the rotating part 121 and the holding arm 122, so that the center of gravity G of the floating structure 200 can be positioned directly above the support shaft 121a when tilting the floating structure 200. This allows the floating structure 200 to be tilted stably.

[0083] Furthermore, the rotation speed of the holding mechanism 120 can be slowed down, and the output of a drive unit (not shown) required to rotate the holding mechanism 120 can be reduced.

[0084] Furthermore, by configuring the slide portion 123 so that the slide portion 123 itself can be extended in the extension direction, it can also be used to dismantle large-sized floating structures 200.

[0085] The above-described embodiments can be combined as appropriate. For example, the support mechanism 130 according to the second embodiment may be applied to the holding devices 103, 104, and 105, and the winch 140 according to the third embodiment may be applied to the holding devices 102, 104, and 105. Furthermore, the weight 150 according to the fourth embodiment may be applied to the holding devices 102, 103, and 105, and the holding mechanism 120 according to the fifth embodiment may be applied to the holding devices 102, 103, and 104.

[0086] The holding device and disassembly method according to each embodiment described above can be understood, for example, as follows. That is, the holding device (101, 102, 103, 104, 105) according to one embodiment of the present disclosure is a holding device for dismantling a bottom-mounted floating structure (200) extending from the bottom (303) toward the water, and comprises a floating body portion (110) that floats on the water, a holding portion (120) that holds the floating structure, and a support portion (130) that is installed on the floating body portion and supports the holding portion so that it can rotate freely around an axis (121a), and the holding portion rotates so that the floating structure tilts.

[0087] The holding device according to this aspect includes a floating body section that floats on the water, a holding section that holds the floating structure, and a support section that is attached to the floating body section and pivots to support the holding section so that it can rotate freely around an axis. The holding section rotates so that the floating structure tilts. For example, a vertically extending floating structure can be detached from the water bottom while held by the holding section and then laid on its side on the floating body section. This allows the floating structure to be detached from the water bottom in a stable state, and the detached floating structure can be safely tilted and laid on its side on the floating body section. Furthermore, for example, by placing a vertically extending floating structure on the floating body section in an laid-down state, the floating structure can be moved to land in a stable state and then disassembled on land. This allows the floating structure to be detached from the bottom of the water and then dismantled without causing harm to nearby ships or other vessels, and without causing pollutants attached to or contained in the floating structure to scatter or flow into the water. Examples of floating structures include meteorological observation towers, marine facility leg structures, lighthouses, power transmission towers, wind turbines, etc. Examples of pollutants include debris from floating structures, dust, oil, etc.

[0088] Moreover, the holding device according to one aspect of the present disclosure includes a drive unit that rotates the holding unit that is pivotally supported by the support unit.

[0089] According to the holding device of this aspect, a drive unit is provided for rotating the holding unit axially supported on the support unit, so that the holding unit holding the above-water structure detached from the bottom of the water can be freely rotated around an axis. The drive unit is composed of, for example, an electric motor and a reducer including a plurality of gears.

[0090] In addition, in the holding device (102) according to one aspect of the present disclosure, the support portion can release the pivotal support of the holding portion to separate the holding portion.

[0091] According to the holding device of this aspect, the support part can release the axial support of the holding part to separate the holding part, so that the mechanical connection between the floating body part and the holding part can be temporarily released. This prevents the rocking of the floating body from being transmitted to the holding part. Therefore, even if the floating body is rocking, the floating structure held by the holding part can be safely separated from the bottom of the water. Conversely, even if the holding part vibrates, the floating body can be prevented from rocking due to the vibration.

[0092] The holding device (103) according to one aspect of the present disclosure also includes a traction means (140) having a wire (142) connected to the holding portion.

[0093] According to the holding device of this aspect, since it is equipped with a traction means having a wire connected to the holding part, it is possible to slow down the rotation speed of the holding part and reduce the output of the drive part (motor, etc.) required to rotate the holding part.

[0094] The holding device (104) according to one aspect of the present disclosure also includes a weight (150) installed in the holding portion.

[0095] According to the holding device of this aspect, since it is equipped with a weight installed in the holding part, it is possible to adjust the position of the combined center of gravity of the floating structure and the holding part. This allows the floating structure to be tilted stably. It also makes it possible to slow down the rotation speed of the holding part and reduce the output of the drive part (motor, etc.) required to rotate the holding part.

[0096] In addition, in the holding device according to one aspect of the present disclosure, the weight of the weight can be changed by pouring water in and out.

[0097] According to the holding device of this embodiment, the weight of the weight can be changed by injecting and draining water, so that the position of the center of gravity can be instantly adjusted when tilting the floating structure. This allows the floating structure to be tilted stably. It also makes it possible to slow down the rotation speed of the holding part and reduce the output of the drive part (motor, etc.) required to rotate the holding part.

[0098] In addition, in a holding device (105) according to one embodiment of the present disclosure, the holding portion has a rotating portion (121) pivotally supported on the support portion, and a sliding portion (123) that is slidably supported relative to the rotating portion and holds the floating structure.

[0099] According to the holding device of this embodiment, the holding part has a rotating part pivotally supported on the support part, and a sliding part that is slidably supported on the rotating part and holds the floating structure, so that the center of gravity of the floating structure can be positioned directly above the axis when the floating structure is tilted. This allows the floating structure to be tilted stably. It also makes it possible to slow down the rotation speed of the holding part and reduce the output of the drive part (motor, etc.) required to rotate the holding part.

[0100] In addition, a dismantling method according to one aspect of the present disclosure is a method for dismantling a bottom-mounted floating structure using a holding device comprising a floating body portion that floats on the water, a holding portion that holds the floating structure, and a support portion that is installed on the floating body portion and supports the holding portion so that it can rotate freely around an axis, and includes a holding step of holding the floating structure with the holding portion, a cutting step of detaching the floating structure held by the holding portion from the bottom of the water, and a tilting step of rotating the holding portion, which holds the floating structure detached from the bottom of the water, around the axis on the floating body portion, to tilt the floating structure.

[0101] In addition, in a dismantling method according to one aspect of the present disclosure, after the holding step and before the cutting step, the support portion is released from the pivotal support of the holding portion, and the support portion supports the holding portion pivotally just before the floating structure is separated from the bottom of the water in the cutting step.

[0102] In addition, in the disassembly method according to one aspect of the present disclosure, the holding device includes a weight attached to the holding portion, and the weight of the weight is adjusted in the tilting process.

[0103] In addition, a dismantling method according to one aspect of the present disclosure includes installing a weight on the floating structure and adjusting the weight of the weight in the tilting process.

[0104] In addition, in a dismantling method according to one aspect of the present disclosure, the holding portion has a rotating portion pivotally supported on the support portion, and a sliding portion that is slidably supported relative to the rotating portion and holds the floating structure, and in the tilting process, the sliding portion is slid relative to the rotating portion so that the center of gravity of the floating structure is positioned directly above the axis.

[0105] In addition, in the dismantling method according to one aspect of the present disclosure, in the cutting step, the portion of the floating structure that is underwater is cut to separate the floating structure from the bottom of the water. [Explanation of symbols]

[0106] 101,102,103,104,105 Holding device 110 Floating Structure (Floating Body) 111 Recess 112 Rail 113 Cushioning material 120 Holding mechanism (holding part) 121 Rotating part 121a Support shaft 121b connection point 122 Holding Arm 123 Slide section 130 Support mechanism (support part) 131 Support cutout 132 Wheels 140 Winch (towing means) 141 Winch body 142 wires 143 Pulley 150 weight 151 Ballast Tank Section 200 Water structures 210 Basics 211 cut surface 220 Structure 301 Water Surface 303 Underwater

Claims

1. A floating body that floats on the water, a holding unit for holding the floating structure; a support portion that is installed on the floating body portion and supports the holding portion so as to be rotatable about an axis; A dismantling method for dismantling a bottom-mounted floating structure using a holding device comprising: a holding step of holding the floating structure with the holding part; a cutting step of separating the above-water structure held by the holding part from the bottom of the water; a tilting step of rotating the holding unit, which holds the floating structure separated from the water bottom, around the axis on the floating body unit to tilt the floating structure; Including, After the holding step and before the cutting step, the support of the holding part by the support part is released, The holding portion is pivotally supported by the support portion immediately before the floating structure is separated from the bottom of the water in the cutting step. Disassembly method.

2. the holding device includes a weight installed on the holding portion, The dismantling method according to claim 1 , wherein the weight of the weight is adjusted in the tilting step.

3. A weight is installed on the floating structure, The dismantling method according to claim 1 , wherein the weight of the weight is adjusted in the tilting step.

4. the holding portion has a rotating portion pivotally supported on the support portion, and a sliding portion slidably supported on the rotating portion and configured to hold the floating structure, 4. A dismantling method according to claim 1, wherein in the tilting step, the sliding part is slid relative to the rotating part so that the center of gravity of the floating structure is positioned directly above the axis.

5. A floating body portion that floats on the water; a holding unit for holding the floating structure; a support portion that is installed on the floating body portion and supports the holding portion so as to be rotatable about an axis; A dismantling method for dismantling a bottom-mounted floating structure using a holding device comprising: a holding step of holding the floating structure with the holding part; a cutting step of separating the above-water structure held by the holding part from the bottom of the water; a tilting step of rotating the holding unit, which holds the floating structure separated from the water bottom, around the axis on the floating body unit to tilt the floating structure; Including, the holding portion has a rotating portion pivotally supported on the support portion, and a sliding portion slidably supported on the rotating portion and configured to hold the floating structure, A dismantling method in which, in the tilting process, the sliding part is slid relative to the rotating part so that the center of gravity of the floating structure is positioned directly above the axis.

6. 6. The dismantling method according to claim 1, wherein the cutting step separates the floating structure from the bottom of the water by cutting the portion of the floating structure that is underwater.

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