Assembly apparatus and assembly method for floating offshore wind power generation equipment

Abstract

To provide an assembly device and an assembly method of a floating type ocean wind power generator which enable stable assembly of the floating type ocean wind power generator without using a large sized crane ship.SOLUTION: An assembly device of a floating type ocean wind power generator includes: a member lift frame 10 supported in a liftable manner by a lifting body part 3 or an existing tower part 4; and lifting means which moves up or down the member lift frame 10. The member lift frame 10 includes: a member placement part 22 on which tower members 4a to 4c are placed; a slide support part 23 which slidably supports lower surfaces of the tower members 4a to 4c placed on the member placement part 22; and sliding means which enables the tower members 4a to 4c to slide to a tower part insertion hole.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an assembling device and an assembling method for assembling a floating offshore wind power generation device.

Background Art

[0002] In recent years, renewable energy has attracted attention as part of energy policies, and wind power generation is positioned as an important means of ensuring power supply.

[0003] In particular, the introduction of offshore wind power generation is being promoted because the wind conditions are better than on land and there is less environmental burden such as noise because it is far from residential areas.

[0004] In offshore wind power generation facilities, generally, when the installation water area is deeper than 60 m such as the open sea, a floating type including a floating body that can be floated in water, a tower part connected to the upper end of the floating body, and a wind turbine facility (nacelle·rotor) supported by the upper end part of the tower part is used (hereinafter referred to as a floating offshore wind power generation device).

[0005] The installation of this floating offshore wind power generation device is to temporarily assemble the floating body, a plurality of tower members constituting the tower part, and the wind turbine facility on the sea in a calm state once, and then transport them to the installation water area by a mother ship or the like in a separated state and assemble them on the water surface of the installation water area.

[0006]

[0007] Furthermore, as a method for installing wind turbine equipment without using large crane ships, a floating tower-type crane has been developed in which a crane is attached to the upper end of a floating structure in which a tower section is joined to a floating body section, and the wind turbine equipment lifted using the floating tower-type crane is attached to the upper end of a tower section attached to another floating body section (see, for example, Patent Document 2). [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2014-227966 [Patent Document 2] Japanese Patent Publication No. 2022-055468 [Overview of the project] [Problems that the invention aims to solve]

[0009] However, with the conventional technology described above, there is a problem in that the floating section may sway due to waves, etc., so the work of sequentially joining the tower components that make up the tower section onto the floating section using a crane ship, and the work of attaching the wind turbine equipment to the upper end of the tower section, can only be carried out on days with calm sea and weather conditions where the relative amount of swaying between the crane ship and the floating section is small.

[0010] Furthermore, in recent years, there has been a significant increase in the size of wind turbines, with standards shifting towards 15 or 20 MW class turbines. This has led to a problem where existing large crane vessels lack sufficient boom length, making it increasingly difficult to accommodate these 15 or 20 MW class offshore wind power generation facilities.

[0011] Furthermore, as offshore wind power generation equipment has become larger, the draft of the floating structure has increased accordingly. This is expected to make it difficult to install wind turbines in calm harbors, not only for spar-type turbines but also for semi-submersible turbines. In the future, this will necessitate operations outside of harbors, where the influence of sea and weather conditions is greater and ultra-large semi-submersible crane vessels are required. This will result in a significant reduction in the number of days on which operations are possible, which are limited to days with calm sea and weather conditions.

[0012] On the other hand, the conventional technology described in Patent Document 2 has the problem that when lifting wind turbine equipment using a floating tower crane, the wind turbine equipment is suspended outside the floating part of the floating tower crane, which tends to make it unstable.

[0013] Furthermore, when installing wind turbine equipment, it is necessary to bring the floating section of the floating tower crane and the floating section supporting the tower on which the wind turbine equipment is installed into close proximity. Moreover, because the center of gravity of the floating tower crane and the floating structure to which the wind turbine equipment is attached are different, their oscillation characteristics differ, resulting in large relative oscillations between the floating structures, which is expected to make the work difficult.

[0014] Therefore, in view of these conventional problems, the present invention aims to provide an assembly apparatus and assembly method for a floating offshore wind power generation system that can stably assemble the floating offshore wind power generation system without using a large crane ship. [Means for solving the problem]

[0015] The invention described in claim 1, which solves the conventional problems described above, is an assembly device for a floating offshore wind power generation device in which a tower section is assembled by sequentially adding tower members to a floating section that stands upright and floats with its upper part protruding above the water, and a wind turbine is attached to the upper end of the tower section, wherein the device has a tower section insertion hole in the center through which an existing tower section, which is assembled by sequentially adding the tower members to the floating section, can be inserted into the floating section or the existing tower section along The system comprises a frame for a member lift that is supported to be able to be raised and lowered, and a means for raising and lowering the frame for the member lift along the existing tower section, wherein the frame for the member lift is arranged around the tower section insertion hole and includes a member mounting section on which the tower member or the wind turbine equipment is placed, a slide support section that slidably supports the lower surface of the tower member placed on the member mounting section, and a slide means for sliding the tower member along the slide support section to the tower section insertion hole.

[0016] The feature of the invention described in claim 2 is that, in addition to the configuration of claim 1, the frame for the member lift is equipped with a crane.

[0017] The features of the invention described in claim 3 are, in addition to the configuration of claim 1, that the lifting means comprises a track laid upward on the outer circumferential surface of the existing tower section and a rotating body rotatably supported on the member lift frame via a support member, wherein the member lift frame is raised and lowered by rotating the rotating body along the track.

[0018] The features of the invention described in claim 4 are that, in addition to the configuration of claim 3, the rotating body is composed of a pinion gear that engages with a rack gear that constitutes the track, and the lifting means is composed of a rack and pinion mechanism.

[0019] The feature of the invention described in claim 5 is that, in addition to the configuration of claim 3 or 4, the support member comprises a movable arm that supports the rotating body, a support member base fixed to the member lift frame and supporting the movable arm in an extendable and retractable manner, and an extendable and retractable means that extends and retracts the movable arm in conjunction with the raising and lowering operation of the member lift frame.

[0020] The feature of the invention described in claim 6 is that, in addition to the configuration of claim 1 or 2, the member lift frame is provided with a holding means that holds the outer circumferential surface of the floating body portion or the existing tower portion and supports the member lift frame on the floating body portion or the existing tower portion.

[0021] The features of the invention described in claim 7 are, in addition to the configuration of claim 6, that the lifting means comprises a lift holding means arranged at a vertical distance from the holding means and holding the outer surface of the floating body or the existing tower, and a lift unit that extends and retracts in the vertical direction, with one end fixed to the lift holding means and the other end fixed to the member lifting frame, and the member lifting frame is raised and lowered by extending and retracting the lift unit while the floating body or the existing tower is held by the lift holding means.

[0022] The feature of the invention according to claim 8 is that, in addition to the configuration of claim 1, the gantry for member lifting includes a slide closing member that closes the gap between the inner peripheral surface of the tower insertion hole and the outer peripheral surface of the existing tower portion, and an additional slide support portion that is disposed on the slide closing member and is connected to the slide support portion.

[0023] The feature of the invention according to claim 9 is that, in addition to the configuration of claim 1, the gantry for member lifting is composed of a plurality of gantry members that are divided into at least two or more parts.

[0024] In the method for assembling a floating offshore wind power generation device, in which a tower portion is assembled while sequentially adding tower members on a floating body portion that stands upright and floats with its upper part protruding above water, and a wind power generation facility is attached to the upper end portion of the tower portion, a member loading operation is performed in which a member placement portion, which is disposed around a tower insertion hole that is open at the center and on which the tower member is placed, a slide support portion that slidably supports the lower surface of the tower member placed on the member placement portion, and slide means for slidingly moving the tower member on the slide support portion to the tower insertion hole are provided on the upper part of the floating body portion at a loading work position. After installing the gantry for member lifting, the tower member pre-placed on the member placement portion is slidably moved on the slide support portion to the tower insertion hole, and after joining the tower member to the upper end of the floating body portion, a member loading operation is performed in which the next tower member is loaded onto the member placement portion at the loading work position, a gantry lifting operation is performed in which the gantry for member lifting on which the tower member is placed is lifted along the floating body portion or the existing tower portion to the upper end portion of the existing tower portion, a member joining operation is performed in which the tower member is slidably moved on the slide support portion to the tower insertion hole at the upper end portion of the existing tower portion and the tower member is joined to the upper end of the existing tower portion, and after joining the tower member, a gantry lowering operation is performed in which the gantry for member lifting is lowered to the loading work position. These operations are sequentially repeated to assemble the tower portion while sequentially adding the tower members on the floating body portion.

[0025] The feature of the invention according to claim 11 is that, in addition to the configuration of claim 10, a track member is pre-laid on the outer peripheral surface of the tower member, and the track member is added as the tower members are connected to form a track, and the member lift gantry is moved up and down along the track.

[0026] The feature of the invention according to claim 12 is that, in addition to the configuration of claim 10, in the member joining operation, the gap generated between the inner peripheral surface of the tower portion insertion hole and the outer peripheral surface of the existing tower portion is closed with a slide closing member, and the additional slide support portion arranged on the slide closing member is connected to the slide support portion.

[0027] The feature of the invention according to claim 13 is that, in addition to the configuration of claim 10, the tower member is lifted by a crane mounted on the member lift gantry, and in this state, the tower member is slid along the slide support portion to the tower portion insertion hole.

[0028] The feature of the invention according to claim 14 is that, in addition to the configuration of claim 10, the member lift gantry is divided into a plurality of gantry members, and after transporting the plurality of gantry members to the installation water area, they are assembled, and after the assembly of the floating offshore wind power generation device is completed, they are disassembled and removed from the plurality of gantry members.

Advantages of the Invention

[0029] The assembly device for a floating offshore wind power generation device according to the present invention has the configuration according to claim 1, so that the influence of the sea and weather conditions at the work site is small, and the assembly work of the floating offshore wind power generation device can be carried out regardless of the specifications of the wind turbine.

[0030] Also, in the present invention, by having the configuration according to claim 2, the assembly of the floating offshore wind power generation device can be carried out without using a crane ship.

[0031] Also, in the present invention, by having the configuration according to claim 3, the member lift gantry can be stably moved up and down along the track.

[0032] Furthermore, in the present invention, by having the configuration described in claim 4, the member lift frame can be suitably raised and lowered along the track, and the member lift frame can be stably supported on the existing tower section.

[0033] Furthermore, by incorporating the configuration described in claim 5, the present invention can also be adapted to tapered cylindrical tower sections.

[0034] Furthermore, in the present invention, by having the configuration described in claim 6, the member lift frame can be stably fixed to the existing tower section when stopped.

[0035] Furthermore, in the present invention, by providing the configuration described in claim 7, the frame for the member lift can be raised and lowered stably.

[0036] Furthermore, in the present invention, by having the configuration described in claim 8, the gap that occurs between the member lifting frame and the existing tower section due to the difference between the inner diameter of the tower section insertion hole and the outer diameter of the existing tower section is sealed, and the tower member to be newly installed at the upper end of the existing tower section can be moved stably.

[0037] Furthermore, by providing the configuration described in claim 9 of the present invention, the frame for the member lift can be easily transported, and the frame for the member lift supported on the tower can be easily disassembled and removed.

[0038] Furthermore, the assembly method for a floating offshore wind power generation device according to the present invention, by having the configuration described in claim 10, is less affected by weather and sea conditions at the work site, and allows assembly work for a floating offshore wind power generation device to be carried out regardless of the specifications of the wind turbine.

[0039] Furthermore, by incorporating the configuration described in claim 11, the present invention simplifies work at the work site, efficiently lays tracks, and allows the frame for the member lift to be smoothly raised and lowered along the tracks.

[0040] Furthermore, in the present invention, by having the configuration described in claim 12, the gap that occurs between the member lifting frame and the existing tower section due to the difference between the inner diameter of the tower section insertion hole and the outer diameter of the existing tower section is sealed, and the tower member to be newly installed at the upper end of the existing tower section can be moved stably.

[0041] Furthermore, in the present invention, by having the configuration described in claim 13, the tower member can be stably moved to the upper end of the existing tower section.

[0042] Furthermore, by providing the configuration described in claim 14, the member lift frame can be easily transported, and the member lift frame supported on the tower can be easily disassembled and removed. [Brief explanation of the drawing]

[0043] [Figure 1] This is a front view showing an example of how the assembly device for a floating offshore wind power generation system according to the present invention is used. [Figure 2] This is an enlarged front view of the main part showing the frame for the component lift shown above. [Figure 3] This is a plan view of the same as above. [Figure 4] This is a cross-sectional view taken along line AA, as shown above. [Figure 5] This is a plan view showing the state with the sliding closing member attached. [Figure 6] This is a plan view showing the frame body as described above in a divided state. [Figure 7] This is a partially enlarged front view showing the engagement portion between the member lift frame and the existing tower section, where (a) is the state at the loading work position, (b) is the state when the tower section has been raised to the middle, and (c) is the state when it has been raised to the top. [Figure 8] This is an enlarged front view showing another embodiment of the assembly apparatus for a floating offshore wind power generation device according to the present invention. [Figure 9] (a) to (c) are partially enlarged front views showing the lifting and lowering procedure of the embodiment shown in Figure 8. [Figure 10] Figures (a) to (c) are front views showing the procedure for assembling a floating offshore wind power generation device according to the present invention, where (a) shows the floating section in place, (b) shows the frame for the component lift in place, and (c) shows the loading of the lowest tower component. [Figure 11] (d) is a diagram showing the state of the member joining work for the lowest tower member, (e) is a diagram showing the state of the loading work for the second tower member, and (f) is a diagram showing the state in which the member lift platform has been raised to the installation height of the second tower member. [Figure 12] (g) is a diagram showing the state of the member joining work for the second stage of the tower, (h) is a diagram showing the state of the loading work for the third stage of the tower, and (i) is a diagram showing the state of the member joining work for the third stage of the tower. [Figure 13] This is a plan view showing the state of the tower component transfer operation in Figure 12(h). [Figure 14] (j) is a diagram showing the loading of the wind turbine equipment, (k) is a diagram showing the wind turbine equipment raised to the installation height, and (l) is a diagram showing the installation of the wind turbine equipment. [Figure 15] (m) is a diagram showing the state of the removal work of the track components, and (n) is a diagram showing the state after the assembly of the floating offshore wind power generation device has been completed. [Modes for carrying out the invention]

[0044] Next, an embodiment of the assembly device for a floating offshore wind power generation system according to the present invention will be described based on the example shown in Figures 1 to 7. In the figures, reference numeral 1 denotes the water surface, and reference numeral 2 denotes the floating offshore wind power generation system.

[0045] The floating offshore wind power generation device 2 comprises a floating section 3 that stands upright and floats above the water with its upper part protruding, and a tower section 4 supported by the floating section 3. The tower section 4 is assembled by sequentially adding tower components 4a, 4b, and 4c on the floating section 3, and finally the wind turbine equipment 5 (nacelle and rotor) is attached to the upper end of the tower section 4.

[0046] The floating section 3 is formed in a vertically elongated cylindrical shape with a hollow section inside, and has a tapered cylindrical connecting section 3a at its upper end, the diameter of which decreases as it moves upward, and the lowest tower member 4a that constitutes the tower section 4 is joined to the connecting section 3a.

[0047] This floating section 3 allows for buoyancy adjustment and center of gravity shifting by filling and draining ballast water into the cavity, and it can stand stably upright in water by filling the inner bottom of the cavity with ballast material such as gravel, iron ore, slag, or concrete.

[0048] Furthermore, although not specifically shown in the diagram, this floating body 3 is moored by a mooring rope connected to an anchor installed on the seabed at its lower end.

[0049] The tower section 4 is formed in a frustoconical shape, with its diameter decreasing towards the upper end. It is assembled by sequentially joining tower members 4a, 4b, and 4c, which are divided into multiple sections in the height direction, starting from the lowest section 4a which is joined to the upper end of the floating section 3.

[0050] The number of divisions for each tower component 4a, 4b, and 4c that make up the tower section 4 is determined so that they can be stably raised and lowered when mounted on the component lift frame 10, which will be described later.

[0051] The assembly device used for this floating offshore wind power generation device 2 (hereinafter referred to as the assembly device) comprises a member lift frame 10 supported so as to be able to move up and down on the floating section 3 or the existing tower section 4, and a lifting means for raising and lowering the member lift frame 10 along the floating section 3 and the existing tower section 4. The device is designed so that tower members 4a, 4b, and 4c are sequentially loaded onto the member lift frame 10 at a loading work position set on the upper part of the floating section 3, and the member lift frame 10 is raised along the existing tower section 4 by the lifting means, allowing the tower member 4b or 4c to be moved to the installation height.

[0052] Furthermore, the existing tower section 4 refers to the tower section 4 formed by the tower members 4a, 4b, and 4c that have already been assembled on the floating section 3, out of the multiple tower members 4a, 4b, and 4c that constitute the tower section 4.

[0053] As shown in Figures 2 to 4, the member lifting frame 10 comprises a frame body 11 that is supported so as to be able to move up and down on the outer surface of the floating section 3 or the existing tower section 4 via a lifting mechanism, and a tower-type crane 12 installed on the upper surface of the frame body 11. The crane 12 can be raised and lowered together with the member lifting frame 10 by the lifting mechanism. The frame body 11 can also be used as a work platform when assembling the floating offshore wind power generation device 2, and reference numeral 13 in the figures indicates a safety fence installed around the upper surface of the frame body 11.

[0054] The crane 12 comprises a slewing section 15 rotatably supported on the tower section 14, and a jib 16 that can rotate vertically on the slewing section 15, with a suspension wire 17 extending from the tip of the jib 16. The specifications of the crane 12 are set taking into account the weight of the tower components 4a, 4b, 4c and the wind turbine equipment 5.

[0055] The frame body 11 is formed in the shape of a rectangular platform with a flat top surface and a tower insertion hole 18 opening in the center. Multiple beam members 20, 20... made of I-beams or the like are arranged radially within a rectangular outer frame 19, centered around the tower insertion hole 18, and a flat top plate member 21 is supported on the upper surface of the frame consisting of the outer frame 19 and the beam members 20, 20....

[0056] On the upper surface of the frame body 11, a member mounting section 22 is arranged around the tower insertion hole 18, and the tower members 4a, 4b, 4c or the wind turbine equipment 5 can be placed on this member mounting section 22.

[0057] The component mounting section 22 is wide enough to accommodate the tower components 4a, 4b, and 4c in an upright position on the upper surface of the frame body 11, opposite the crane 12.

[0058] The tower section insertion hole 18 is formed with an outer diameter slightly larger than the outer diameter of the upper end of the floating body section 3, so that the inner surface of the tower section insertion hole 18 does not interfere with the outer surfaces of the floating body section 3 and the tower section 4.

[0059] Furthermore, the frame body 11 is equipped with a sliding support section 23 that slidably supports the lower surfaces of the tower members 4a, 4b, and 4c placed on the member mounting section 22, and a sliding means that slides the tower members 4a, 4b, and 4c along the sliding support section 23 to the tower section insertion hole 18, so that the tower members 4a, 4b, and 4c can be joined to the upper end of the existing tower section 4 on the frame body 11.

[0060] Furthermore, if the tower section 4 is a frustoconical cylinder whose diameter decreases towards the upper end, when the member lift frame 10 is raised along the existing tower section 4 and the tower members 4b and 4c are moved to the installation height, a gap is created between the inner surface of the tower section insertion hole 18 and the outer surface of the existing tower section 4.

[0061] Therefore, as shown in Figure 5, the member lift frame 10 is equipped with sliding closing members 24, 24 that close the gap between the inner surface of the tower insertion hole 18 and the outer surface of the existing tower section 4, and an extension sliding support section 25 that is placed on the sliding closing members 24 and connected to the sliding support section 23. After the member lift frame 10 moves to the installation height, the sliding closing members 24, 24 close the gap, allowing the tower members 4b, 4c to slide from the member mounting section 22 to the upper end of the existing tower section 4.

[0062] Furthermore, the sliding closing members 24, 24 are provided in multiple types, depending on the number of divisions of the tower members 4a, 4b, 4c, and based on the size of the gap between the inner surface of the tower insertion hole 18 and the outer surface of the existing tower section 4 at the installation height of each tower member 4a, 4b, 4c.

[0063] Furthermore, as shown in Figure 6, the main support structure 11 is composed of multiple support members 11A, 11B (divided into two in this embodiment) that are divided into at least two or more sections around the tower section insertion hole 18, and each support member 11A, 11B can be assembled and disassembled around the tower section insertion hole 18.

[0064] Each of the support members 11A and 11B has a semicircular or arc-shaped notch formed at the end edge of the top plate member 21 where they are joined together. The support members 11A and 11B are joined together by welding, bolting, etc., so that a circular tower insertion hole 18 is formed in the center of the support body 11.

[0065] The form of the slide support section 23 and the extension slide support section 25 is not particularly limited, but for example, it may be formed by painting the area from the member mounting section 22 on the upper surface of the frame body 11 to the tower insertion hole 18 with a paint made of a low friction material, or it may be formed by laying stainless steel plates or rails, or the tower members 4a, 4b, and 4c may be supported by rollers or the like.

[0066] As shown in Figure 3, the sliding mechanism uses a winch 26 located on the upper surface of the frame body 11 opposite to the member mounting section 22. A wire 27 is unwound from the winch 26 and wrapped around the outer circumference of the tower members 4a, 4b, and 4c. The end of the wire is connected to an anchor member 28 installed on the opposite side of the tower section 4 from the winch 26. The winch 26 then winds up the wire 27, pulling the tower members 4a, 4b, and 4c towards the tower section insertion hole 18, thereby causing them to slide. It is desirable to install protective members between the outer circumference of the tower members 4a, 4b, and 4c and the wire 7 to prevent damage to the outer circumference of the tower members 4a, 4b, and 4c by the wire 7.

[0067] Furthermore, to prevent the tower members 4a, 4b, and 4c from tipping over, it is desirable to perform the sliding movement of the tower members 4a, 4b, and 4c while they are suspended by the crane 12.

[0068] The lifting mechanism comprises a plurality of tracks 30, 30... laid upward on the outer circumferential surface of the existing tower section 4 and spaced apart in the circumferential direction, and a rotating body 32 rotatably supported on the lower surface of the frame body 11 via support members 31, 31... in a position corresponding to each track 30, 30..., and the member lift frame 10 is raised and lowered by rotating the rotating body 32 along the tracks 30, 30....

[0069] Tracks 30, 30... should be installed at least three locations with spacing in the circumferential direction, and preferably at least four locations. The number of installation locations for track 30 should be determined considering the weight of the member lift frame 10 and each tower member 4a to 4c.

[0070] Furthermore, when installing the tracks 30, 30…, it is desirable to avoid locations where removal work by the crane 12 would be difficult, taking into consideration the removal of the tracks 30, 30….

[0071] The rotating body 32 is composed of a pinion gear that engages with a rack gear constituting the track 30, as shown in Figure 7, for example, and the member lifting frame 10 is raised and lowered by a rack and pinion mechanism which is a lifting means. Reference numeral 38 in the figure indicates a fall prevention member that prevents the rotating body 32 from falling off the track 30, similar to a wheel stop.

[0072] Furthermore, the rotating body 32, which is a pinion gear, rotates using power from a servo motor or the like (not shown), and its rotation and stopping are controlled. By rotating, the member lift frame 10 is raised and lowered, and by stopping, the member lift frame 10 can be maintained in a state where it is supported by the floating body 3 or the existing tower section 4 at a predetermined position (the installation height position of the tower members 4a, 4b, 4c).

[0073] The support members 31, 31... are fixed to the lower surface of the frame body 11 (beam member 20) with their tip ends, which support the rotating body 32, tilted at a predetermined angle diagonally downward toward the existing tower section 4, so as to be able to bear the load of the member lift frame 10 and the tower members 4a, 4b, 4c placed on the member lift frame 10.

[0074] Each of these support members 31, 31… comprises a movable arm 33 that rotatably supports the pinion gear, which is the rotating body 32; a support member base 34 fixed along the lower surface of the radially arranged beam members 20, 20… of the frame body 11 and extending and retractingly supporting the movable arm 33; and an extension / retraction mechanism that extends and retracts the movable arm 33 in conjunction with the raising and lowering movement of the member lift frame 10. The pinion gear, which is the rotating body 32, is always engaged with the rack gear, which is the track 30 laid on the truncated cone-shaped floating body 3 or the existing tower section 4, whose outer diameter fluctuates in the vertical direction.

[0075] The extension and retraction mechanism is not particularly limited, but it may be controlled in synchronization with the operation of the rack and pinion mechanism that constitutes the lifting and lowering mechanism, and the movable arm 33 may slide relative to the support member base 34 using a hydraulic cylinder, the rack and pinion mechanism, or a servo motor as power. Alternatively, a biasing mechanism may be used to constantly bias the pinion gear, which is the rotating body 32, toward the rack gear by an elastic body such as a spring or fluid pressure such as hydraulic or pneumatic pressure.

[0076] Furthermore, as shown in Figure 7, the support members 31, 31... may also be equipped with a movable suspension member 35 whose upper end is supported by the beam members 20, 20... and whose lower end is connected to the movable arm 33, so that the load acting on the extended movable arm 33 can be borne by the movable suspension member 35.

[0077] The movable suspension member 35 includes, for example, a trolley portion 36 that moves along the beam member 20, and an extendable support member 37 such as a hydraulic cylinder whose upper end is supported by the trolley portion 36, with the lower end of the extendable support member 37 fixed to the movable arm portion 33.

[0078] As shown in Figures 7(a) to 7(c), the movable suspension member 35 supports the movable arm 33 by having the trolley portion 36 move along the beam member 20 in conjunction with the extension and retraction of the movable arm portion 33, and by the extension and retraction of the retractable support member 37.

[0079] The configuration of the bogie section 36 is not particularly limited, but for example, a trolley type having wheels that slide on both flanges of the I-shaped steel constituting the beam member 20 may be used.

[0080] Although not specifically shown, the support member 31 may be supported at its base end on the lower surface of the frame body 11 in a manner that allows it to rotate vertically, and may also be equipped with a suspension link member having one end rotatably supported on the lower surface of the frame body 11 and the other end rotatably connected to the movable arm 33, and supported by a link mechanism consisting of the frame body 11, the support member 31, and the suspension link member. In this case, as the movable arm 33 extends and retracts, the suspension link member rotates and the support member 31 rotates, so that the pinion gear, which is the rotating body 32, can always be engaged with the rack gear, which is the track 30.

[0081] Furthermore, the member lift frame 10 may be provided not only with a lifting mechanism, but also with a holding mechanism 40 in addition to the lifting mechanism to hold the outer surface of the floating body 3 or the existing tower 4, as shown in Figure 8, so that the member lift frame 10 can be stably fixed to the floating body 3 or the existing tower 4 when stopped.

[0082] The holding means 40 can be, for example, a plurality of jacking devices 41, 41... that extend and retract radially from the existing tower section 4, which are arranged at circumferential intervals along the tower section insertion hole 18 on the lower surface of the member lift frame 10.

[0083] Each jack device 41, 41... has a cylinder portion 42 fixed to the lower surface of the beam member 20 of the frame body 11, and the tip of the rod portion 43 extending from the cylinder portion 42 contacts the outer surface of the floating portion 3 or the existing tower portion 4, thereby fixing the member lift frame 10 to the floating portion 3 or the existing tower portion 4. By retracting the rod portion 43, the tip of the rod portion 43 detaches from the outer surface of the floating portion 3 or the existing tower portion 4, and the member lift frame 10 is released from the floating portion 3 or the existing tower portion 4.

[0084] In the above embodiment, the case in which the lifting means is configured by a rack and pinion mechanism was described, but the configuration of the lifting means is not limited thereto. For example, a tire that rotates along the surface of the track 30 may be used as the rotating body 32, and the member lifting frame 10 may be supported on the floating body or existing tower section 4 by friction between the track 30, 30... and the tire, and the member lifting frame 10 may be raised and lowered by the rotation of the tire.

[0085] Furthermore, the lifting mechanism may also be a vertically sliding lifting mechanism, as shown in the embodiments of Figures 8 and 9, comprising a lift holding means 44 positioned at a vertical distance from the holding means 40 to hold the outer surface of the floating body 3 or the existing tower 4, and a vertically retractable lift unit, one end of which is fixed to the lift holding means 44 and the other end of which is fixed to the member lift frame 10, thereby raising and lowering the member lift frame 10 by the relative movement of the holding means 40 and the lift holding means 44. Note that components similar to those in the above embodiments are denoted by the same reference numerals and their descriptions are omitted.

[0086] The lift holding means 44, like the holding means 40, uses a plurality of jack devices 41, 41... etc. that extend and retract radially from the existing tower section 4, which is spaced apart in the circumferential direction, and each jack device 41, 41... is fixed to the lower end of each vertically moving jack 45 that constitutes the lift unit.

[0087] The vertically moving jacks 45 that make up the lift unit are made up of hydraulic, mechanical, or other types of jacking devices, and their upper ends are fixed to the lower surface of the member lifting frame 10.

[0088] The raising and lowering operation of the member lift frame 10 using this vertical sliding lifting mechanism is performed according to the procedure shown in Figure 9.

[0089] First, as shown in Figure 9(a), with the vertical jack 45 retracted, the jack devices 41, 41... constituting the lift holding means 44 are extended so that the tips of the rod portions 43 contact the outer circumference of the floating body portion 3 or the existing tower portion 4, thereby supporting the member lift frame 10 via the lift holding means 44. After that, each jack device 41, 41... of the holding means 40 is retracted to release the holding means 40 from the floating body portion 3 or the existing tower portion 4.

[0090] Next, as shown in Figure 9(b), the vertical jack 45 is extended, and the member lift frame 10 is raised along the existing tower section 4 while being supported by the floating section 3 or the existing tower section 4 via the lift holding means 44.

[0091] Next, in the raised position, as shown in Figure 9(c), each jack device 41, 41… constituting the holding means 40 is extended so that the tip of the rod portion 43 contacts the outer circumference of the floating body portion 3 or the existing tower portion 4, thereby supporting the member lift frame 10 on the existing tower portion 4 via the holding means 40.

[0092] After the member lift frame 10 is supported on the existing tower section 4 via the holding means 40, the jack devices 41, 41... of the lift holding means 44 are retracted to release the lift holding means 44 from the floating section 3 or the existing tower section 4, and in that state, the vertical jacks 45 are retracted to pull the lift holding means 44 upward.

[0093] Then, by repeating the operations shown in Figures 9(a) to (c), the member lift frame 10 rises along the existing tower section 4.

[0094] In this vertical sliding lifting mechanism, the member lifting frame 10 is supported on the existing tower section 4 by the holding means 40, the vertical jack 45 is extended, the floating section 3 or the existing tower section 4 is held by the lift holding means 44, the holding means 40 is then released from the existing tower section 4, and the vertical jack 45 is retracted in that state, causing the member lifting frame 10 to descend. The member lifting frame 10 is then supported on the existing tower section 4 again by the holding means 40, and this series of operations is repeated to lower the member lifting frame 10.

[0095] Next, the assembly method of a floating offshore wind power generation system using the assembly device described above will be explained based on the embodiment shown in Figures 10 to 15. Components similar to those in the above embodiment will be denoted by the same reference numerals.

[0096] Prior to construction, taking into account the specifications of the floating offshore wind power generation device 2 to be assembled, the number of tower components 4a, 4b, and 4c constituting the tower section 4 is determined so that the weight is within the range that the component lifting frame 10 can stably lift and lower. The size of the component lifting frame 10 and the specifications of the crane 12 are then determined based on the weight of the heaviest tower component 4a.

[0097] Furthermore, when determining the number of divisions for the tower members 4a, 4b, and 4c and the size of the member lift base 10, the stability of the floating section 3 when assembling the uppermost section of the tower 4 is considered, and the weight of each tower member 4a, 4b, and 4c and the size of the member lift base 10 are determined to ensure stability.

[0098] Next, once the specifications for each tower component 4a, 4b, 4c and the component lift support frame 10 are determined, the floating body 3, each tower component 4a, 4b, 4c, the wind turbine equipment 5, and the component lift support frame 10 are manufactured at a fabrication yard or similar location on land.

[0099] At that time, track members 30a to 30c, which constitute the rack gear and are tracks 30, 30…, are laid in predetermined positions on the upper part of the floating body 3 and on the outer circumferential surfaces of each tower member 4a, 4b, 4c. By aligning the positions of the track members 30a to 30c on each tower member 4a, 4b, 4c and joining the floating body 3 with the tower member 4a or the tower members 4a, 4b, 4c together, the track members 30a to 30c laid on the floating body 3 and each tower member 4a, 4b, 4c are joined together, so that a vertically continuous track 30, 30… is formed on the outer circumferential surface of the existing tower body 4.

[0100] Furthermore, the frame 10 for the member lift is manufactured by dividing the frame body 11 into multiple frame members 11A and 11B so that it can be assembled and disassembled around the tower insertion hole 18.

[0101] Furthermore, each of the mounting members 11A and 11B has a pinion gear, which is a rotating body 32, attached to it in a predetermined position via support members 31, 31...

[0102] Then, the manufactured floating body 3, the tower components 4a, 4b, 4c, the wind turbine equipment 5, the frame components 11A, 11B for the frame 10 for the component lift, the crane 12, and other equipment are loaded onto a barge 50 or SEP vessel, etc., and transported to the installation area of ​​the floating offshore wind power generation device 2.

[0103] The assembly of the floating offshore wind power generation device 2 in the installation area begins with filling the inner bottom of the hollow section of the floating body 3 with ballast water and ballast materials such as gravel, iron ore, slag, and concrete, as shown in Figure 10(a). The floating body 3 is then stably erected in the water, and its lower end is moored by a mooring rope connected to an anchor installed on the seabed.

[0104] The method for installing the floating body 3 is not particularly limited, but it can be installed by known methods.

[0105] Next, as shown in Figure 10(b), the member lift frame 10 is installed at the upper end of the floating section 3, and its position is set as the loading position.

[0106] The frame 10 for the component lift is assembled by joining the frame members 11A and 11B together by welding or bolting them together in a relatively stable location such as on the deck of a barge 50 or SEP ship, aligning the positions of the notches that make up the tower section insertion holes 18, and then installing the safety fence 13.

[0107] Then, the assembled material lift frame 10 is lifted by a crane (not shown) such as a crane ship or SEP ship and moved to the upper part of the floating body 3. The positions of the pinion gears, which are the rotating bodies 32, are aligned with the track 30 laid on the floating body 3, and in that state, the material lift frame 10 is lowered to the position that will be the loading work position.

[0108] Furthermore, the loading position shall be such that the upper end surface of the floating section 3 and the upper surface of the frame body 11 are on approximately the same plane.

[0109] Then, at the loading position, the movable arm 33 is extended and the rotating body 32, which is a pinion gear, is engaged with the track 30, which is a rack gear, thereby supporting the member lift frame 10 on top of the floating body 3.

[0110] Finally, the crane 12 is positioned at a predetermined location on the upper surface of the frame body 11, completing the installation work of the frame 10 for the material lift.

[0111] Next, as shown in Figure 10(c), the barge 50 loaded with tower members 4a, 4b, and 4c is moved closer to the floating section 3. At that position, the tower member 4a, which constitutes the lowest part of the tower section 4 and is placed on the barge 50, is lifted by the crane 12 and moved to the member placement section 22 of the member lift frame 10, and then lowered onto the member placement section 22 (member loading operation).

[0112] In this process, the member lift platform 10 is installed at a stable loading position close to the water surface of the floating body 3, and the tower members 4a are transferred using the crane 12 installed on the member lift platform 10. Therefore, the operation is less affected by sea and weather conditions and can be carried out stably without being affected by differences in relative oscillation characteristics between the floating body 3 and the barge 50.

[0113] Then, the wire 27 unwound from the winch 26 is wrapped around the outer circumference of the tower member 4a, and its end is connected to an anchor 28 installed on the opposite side of the winch 26, forming a sliding mechanism.

[0114] Next, as shown in Figures 11(d) and 5, the winch 26 winds up the wire 27, pulling the tower member 4a towards the tower insertion hole 18. The tower member 4a, which is placed on the member mounting section 22, is slid along the slide support section 23 to the tower insertion hole 18, and the lower end surface of the tower member 4a is placed on the upper end surface of the floating section 3 inserted into the tower insertion hole 18 (member joining operation).

[0115] During sliding movement, the tower member 4a is suspended by the crane 12, and in that state, the tower member 4a is slid along the slide support 23 to the tower insertion hole 18, thereby preventing the tower member 4a from tipping over.

[0116] Then, the positions are finely adjusted so that the position of the track 30 laid on the floating body 3 matches the position of the track member 30a that has been laid in advance on the outer surface of the tower member 4a, and then the floating body 3 and the lowest tower member 4a are joined together.

[0117] Furthermore, the means of joining the floating body 3 to the tower members 4a or to the tower members 4a, 4b, and 4c is not particularly limited, but flanges may be provided on the outer or inner circumference of the ends of the floating body 3 and the tower members 4a, 4b, and 4c, and the flanges may be fastened together by bolts, or they may be joined by welding.

[0118] Once the connection between the lowest tower member 4a and the floating body 3 is complete, the next tower member 4b, which is placed on the barge 50, is lifted by the crane 12 as shown in Figure 11(e), moved to the member loading section 22 of the member lift frame 10, and lowered onto the member loading section 22 (member loading operation).

[0119] At that time, the next tower component 4b is transferred to the component lift platform 10 at a stable loading position close to the water surface of the floating body 3, so that it is less affected by weather and sea conditions and the work can be carried out stably without being affected by the difference in relative oscillation characteristics between the floating body 3 and the barge 50.

[0120] Furthermore, it is desirable to secure the following tower component 4b to the component lift base 10 with wires or the like to prevent it from tipping over when the component lift base 10 rises.

[0121] Once the loading of the next tower member 4b onto the member lift frame 10 is complete, as shown in Figure 11(f), the lifting mechanism raises the member lift frame 10 along the floating section 3 and the existing tower section 4, and the next tower member 4b and crane 12 placed on the member placement section 22 of the member lift frame 10 are raised together with the member lift frame 10 (frame raising operation).

[0122] The platform raising operation involves rotating a pinion gear, which is a rotating body 32, engaged with a rack gear, which is a track 30, 30..., thereby raising the platform 10 for lifting the member by a rack and pinion mechanism.

[0123] In this case, since the upper end of the floating section 3 and the existing tower section 4 are formed in a frustoconical shape with a diameter that decreases as they move towards the upper end, the relative position between the rotating body 32, which is the pinion gear, and the track 30, which is the rack gear, changes as the member lift frame 10 rises. Therefore, the movable arm 33 is extended in conjunction with the rising movement to maintain a state in which the pinion gear is always engaged with the rack gear.

[0124] Furthermore, as the movable arm 33 extends, the trolley portion 36 of the movable suspension member 35 moves along the beam member 20 towards the tower insertion hole 18, and the telescopic support member 37 extends to support the movable arm 33.

[0125] In this way, by raising the member lift frame 10 on which the next tower member 4b and crane 12 are mounted along the existing tower section 4, the member lift frame 10 can be raised under the same oscillation characteristics as the existing tower section 4 supported by the floating section 3, thereby suppressing the effects of relative oscillation and allowing the tower member 4b to be safely moved to the installation position.

[0126] Then, as shown in Figure 12(g), when the member lifting frame 10 reaches the installation position for the next tower member 4b, that is, when the upper end surface of the existing tower section 4 and the upper surface of the frame body 11 are at approximately the same height, the sliding closing members 24, 24 are fitted between the outer circumference of the existing tower section 4 and the inner circumference of the tower section insertion hole 18, so that the tower member 4b can slide from the member mounting section 22 to the upper end surface of the existing tower section 4.

[0127] Subsequently, the winch 26 is used to wind up the wire 27, pulling the tower member 4b towards the tower insertion hole 18. The next tower member 4b, which has been placed on the member mounting section 22, is then slid along the slide support section 23 and the extension slide support section 31 to the tower insertion hole 18, and the lower end surface of the next tower member 4b is placed on the upper end surface of the existing tower section 4 inserted into the tower insertion hole 18 (member joining operation).

[0128] Furthermore, during sliding movement, the tower member 4b is suspended by the crane 12, and in that state, the tower member 4b is slid along the sliding support part 23 to the tower insertion hole 18, thereby preventing the tower member 4b from tipping over.

[0129] In this process, the center of gravity of the entire floating structure, including the member lift frame 10, changes as the tower member 4b moves. However, by sliding the tower member 4b on the member lift frame 10, sudden changes in the center of gravity are suppressed, allowing the joining work of the tower member 4b to be performed while minimizing the oscillation of the floating structure.

[0130] Then, once the joining of tower members 4a and 4b is complete, the sliding closing members 24, 24 are removed, and the pinion gear, which is the rotating body 32 engaged with the rack gear, which is the track 30, 30..., is rotated in the opposite direction to when it was raised, and the member lift platform 10 is lowered to the loading work position by the rack and pinion mechanism (platform lowering operation).

[0131] In this case, since the existing tower section 4 is formed in a frustoconical shape with a larger diameter as it extends downwards, the relative position between the pinion gear and the rack gear changes as the member lift frame 10 descends. Therefore, the movable arm section 33 is retracted by the extension / retraction mechanism in conjunction with the descending movement, maintaining a state in which the pinion gear is always engaged with the rack gear.

[0132] Furthermore, as the movable arm 33 contracts, the trolley portion 36 of the movable suspension member 35 moves along the beam members 20, 20... to the side opposite the tower insertion hole 18, and the expandable support member 37 contracts to support the movable arm 33.

[0133] Once the member lift platform 10 has been lowered to the loading position, the next tower member 4c, which is placed on the barge 50, is loaded onto the member loading section 22, as shown in Figure 12(h) (member loading operation).

[0134] In this case, if the existing tower section 4 has reached a certain height, the existing tower section 4 and the jib 16 of the crane 12 may interfere with each other, making it impossible for the crane 12 to directly move the member to the member mounting section 22 from the barge 50.

[0135] In that case, as shown in Figure 13, the tower member 4c lifted from the barge 50 by the crane 12 is moved to a position where the jib 16 of the crane 12 and the existing tower section 4 do not interfere with each other, and is temporarily placed on the upper surface of the frame body 11 at that position, and then slid from that position to the member placement section 22 on the upper surface of the frame body 11.

[0136] Furthermore, if the tower member 4c is stable when placed at the temporary placement location, the temporary placement location may be designated as a new member placement section 22, and the slide support section 23 and the extension slide support section 25 may be installed from the new member placement section 22 toward the tower insertion hole 18.

[0137] In this component loading operation, even if the existing tower section 4 rises, the next tower component 4c is transferred to the component lift platform 10 at a stable loading position close to the water surface of the floating section 3. Therefore, it is less affected by weather and sea conditions, and the operation can be carried out stably without being affected by the difference in relative oscillation characteristics between the floating section 3 and the barge 50.

[0138] Furthermore, it is desirable to secure the following tower member 4c to the member lift base 10 with wires or the like to prevent it from tipping over when the member lift base 10 rises.

[0139] Once the loading of the next tower member 4c onto the member lift frame 10 is complete, as shown in Figure 12(i), the member lift frame 10 is raised along the floating section 3 and the existing tower section 4 using the lifting means, similar to the frame raising operation described above, and the next tower member 4c and the crane 12 placed on the member placement section 22 of the member lift frame 10 are raised together with the member lift frame 10 (frame raising operation).

[0140] Then, when the member lifting frame 10 reaches the installation position for the next tower member 4c, that is, the position where the upper end surface of the existing tower section 4 and the upper surface of the frame body 11 are at approximately the same height, the sliding closing members 24, 24 corresponding to the tower member 4c are fitted between the outer circumference of the existing tower section 4 and the inner circumference of the tower section insertion hole 18, so that the tower member 4c can slide from the member mounting section 22 to the upper end surface of the existing tower section 4.

[0141] Subsequently, in the same manner as the member joining operation described above, the wire 27 is wound up with the winch 26, the tower member 4c is pulled towards the tower section insertion hole 18, the next tower member 4c placed on the member placement section 22 is slid along the slide support section 23 and the extension slide support section 25 to the tower section insertion hole 18, and the lower end surface of the next tower member 4c is placed on the upper end surface of the existing tower section 4 inserted into the tower section insertion hole 18 (member joining operation).

[0142] Once the joining of tower members 4b and 4c is complete, the sliding closing members 24, 24 are removed, similar to the frame lowering operation described above. The pinion gears engaged with the rack gears, which are tracks 30, 30..., are rotated in the opposite direction to when they were raised, and the frame 10 for the member lift is lowered to the loading work position by the rack and pinion mechanism (frame lowering operation).

[0143] Then, according to the number of divisions of the tower members 4a, 4b, and 4c, the above-described member loading work, frame raising work, member joining work, and frame lowering work are repeated to complete the assembly of the tower section 4.

[0144] Next, as shown in Figure 14(j), the member lift platform 10 is lowered to the loading work position, and at the loading work position, the wind turbine equipment 5 is loaded onto the member lift platform 10 from the barge 50 using the crane 12.

[0145] In this case, since it is not possible to place the material lift frame 10 with all the blades attached, some of the blades are left detached.

[0146] Then, as shown in Figure 14(k), the frame 10 for the member lift, on which the wind turbine equipment 5 is loaded, is raised along the tower section 4 to a predetermined position, and while the wind turbine equipment 5 is held in place by the crane 12, it is moved to the upper end of the tower section 4 using jacks and winches 26 and joined to the upper end.

[0147] Subsequently, as shown in Figure 14(l), the removed blades are lifted from the barge 50 using the crane 12 and attached, completing the assembly of the floating offshore wind power generation device.

[0148] Once the assembly of the floating offshore wind power generation device is complete, as shown in Figure 15(m), the frame 10 for the component lift is lowered to a predetermined position, and at each step, the track components 30a to 30c are removed while the frame is lowered to the loading position.

[0149] Furthermore, the track members 30a to 30c may be left attached to the tower section 4 without being removed, anticipating the use of the member lift platform 10 or other lifting scaffolding during future maintenance or parts replacement. If the track members 30a to 30c are left in place, the oscillation characteristics of the floating offshore wind power generation device 2 will be affected by the air resistance experienced by the remaining track members 30a to 30c. Therefore, it is necessary to design the floating offshore wind power generation device 2 in advance, taking into account the effect of air resistance experienced by the track members 30a to 30c.

[0150] Finally, as shown in Figure 15(n), the member lift frame 10 is separated into the crane 12 and the frame members 11A and 11B at the loading work position and removed, and the track members 30a to 30c of the floating section 3 are removed to complete the work.

[0151] In the assembly apparatus and assembly method for a floating offshore wind power generation device according to the present invention, configured in this manner, the tower members 4a, 4b, and 4c are transported along the existing tower section 4 to the installation height by the member lift frame 10. Unlike when using a crane ship or the like, collisions between the tower members 4a, 4b, and 4c, which are suspended by a crane ship or SEP ship, and the existing tower section 4 caused by swaying due to differences in oscillation characteristics can be suitably avoided. This reduces the influence of weather and sea conditions at the work site, and allows assembly work for the floating offshore wind power generation device 2 to be carried out regardless of the specifications of the wind turbine.

[0152] Furthermore, in this invention, the tower members 4a, 4b, and 4c are slid along the support frame and joined to the upper end of the existing tower section 4, thereby suppressing swaying due to sudden changes in the center of gravity and enabling safe work.

[0153] In the above-described embodiment of the assembly method, the case in which a rack-and-pinion mechanism is used for the lifting mechanism was explained. However, even if other lifting mechanisms such as the vertical sliding lifting mechanism shown in the figure are used, the lifting operation will be performed using a similar procedure, although the operation will differ. Furthermore, the lifting mechanism may be a combination of a rack-and-pinion mechanism and other lifting mechanisms such as a vertical sliding lifting mechanism.

[0154] Furthermore, although the above embodiment described a case in which support members 31, 31... equipped with extendable movable arms 33 are used, the portion of the tracks 30, 30... that engages with the rotating body 32 may be extended vertically, and the rotating body 32 may be positioned in a fixed location. [Explanation of symbols]

[0155] 1 water surface 2. Floating offshore wind turbine 3. Floating section 4 Tower 5 Windmill equipment 10. Stand for component lift 11. Main frame 12 Cranes 13 Safety fence 14 Tower Section 15. Swivel section 16 Jib 17. Suspension wires 18 Through hole in tower section 19 Outer frame 20 Beam members 21 Top plate component 22 Member mounting section 23 Slide support section 24. Closing member for sliding 25 Extension slide support section 26 winches 27 wires 28 Anchor members 30. Track (rack gear) 31 Support member 32 Rotating Body (Pinion Gear) 33 Movable arm 34 Support member base 35 Movable suspension member 36 Bogie section 37. Expandable support member 38 Anti-detachment member 40 Retention means 41 Jacking device 42 Cylinder section 43 Rod section 44. Holding means for lift 45 Up / Down Jack 50 barges

Claims

1. In an assembly apparatus for a floating offshore wind power generation system, the tower section is assembled by sequentially adding tower components to a floating body that stands upright and floats with its upper part protruding above the water, and the wind turbine equipment is attached to the upper end of the tower section, A member lift frame has a central tower section insertion hole through which an existing tower section, which is assembled by sequentially adding the tower members onto the floating section, can be inserted, and is supported so as to be able to move up and down along the floating section or the existing tower section. The system includes a lifting mechanism for raising and lowering the frame for the member lift along the existing tower section, The assembly apparatus for a floating offshore wind power generation device is characterized in that the member lifting frame is arranged around the tower insertion hole and comprises a member mounting section on which the tower member or the wind turbine equipment is placed, a slide support section that slidably supports the lower surface of the tower member placed on the member mounting section, and a sliding means for sliding the tower member along the slide support section to the tower insertion hole.

2. The assembly apparatus for a floating offshore wind power generation device according to claim 1, wherein the frame for the member lift is equipped with a crane.

3. The assembly device for a floating offshore wind power generation device according to claim 1, wherein the lifting means comprises a track laid upward on the outer circumferential surface of the existing tower section and a rotating body rotatably supported on the member lifting frame via a support member, and the member lifting frame is raised and lowered by rotating the rotating body along the track.

4. The assembly apparatus for a floating offshore wind power generation device according to claim 3, wherein the rotating body is composed of a pinion gear that engages with a rack gear constituting the track, and the lifting means is composed of a rack and pinion mechanism.

5. The assembly apparatus for a floating offshore wind power generation device according to claim 3 or 4, wherein the support member comprises a movable arm portion that supports the rotating body, a support member base portion fixed to the member lift frame and extending and retractingly supporting the movable arm portion, and an extension and retraction means that extends and retracts the movable arm portion in conjunction with the raising and lowering movement of the member lift frame.

6. The assembly apparatus for a floating offshore wind power generation device according to claim 1 or 2, wherein the member lifting frame is provided with a holding means for holding the outer surface of the floating portion or the existing tower portion and for supporting the member lifting frame on the floating portion or the existing tower portion.

7. The assembly apparatus for a floating offshore wind power generation device according to claim 6, wherein the lifting means comprises a lift holding means arranged at a vertical distance from the holding means and holding the outer surface of the floating body or the existing tower, and a lift unit that extends and retracts in the vertical direction, with one end fixed to the lift holding means and the other end fixed to the member lifting frame, and the member lifting frame is raised and lowered by extending and retracting the lift unit while the floating body or the existing tower is held by the lift holding means.

8. The assembly apparatus for a floating offshore wind power generation device according to claim 1, wherein the frame for the member lift comprises a sliding closing member that closes the gap between the inner circumferential surface of the tower insertion hole and the outer circumferential surface of the existing tower, and an extension sliding support portion that is disposed on the sliding closing member and connected to the sliding support portion.

9. The assembly device for a floating offshore wind power generation system according to claim 1, wherein the frame for the member lift is composed of a plurality of frame members divided into at least two or more sections.

10. In a method for assembling a floating offshore wind power generation device, in which a tower section is assembled by sequentially adding tower components to a floating body that stands upright and floats with its upper part protruding above the water, and a wind turbine is attached to the upper end of the tower section, After installing a member lift frame, which is arranged around a centrally opening tower insertion hole and includes a member placement section on which the tower member is placed, a slide support section that slidably supports the lower surface of the tower member placed on the member placement section, and a sliding means for sliding the tower member along the slide support section to the tower insertion hole, at a loading position provided on the upper part of the floating body, The tower member, which has been previously placed on the member mounting section, is slid along the slide support section to the tower insertion hole, and the tower member is joined to the upper end of the floating section. The loading operation involves loading the next tower member onto the member placement section at the aforementioned loading work position, A frame raising operation is performed to raise the frame for the member lift, on which the tower members are placed along the floating section or the existing tower section, up to the upper end of the existing tower section. The member joining operation involves sliding the tower member along the slide support portion to the tower insertion hole at the upper end of the existing tower section, and joining the tower member to the upper end of the existing tower section. After joining the tower members, the platform lowering operation is performed to lower the platform for the member lift to the loading work position, A method for assembling a floating offshore wind power generation device, characterized by sequentially repeating the above process and assembling the tower section by sequentially adding the tower members onto the floating section.

11. A method for assembling a floating offshore wind power generation device according to claim 10, wherein track members are laid in advance on the outer surface of the tower members, the track members are extended to form a track as the tower members are connected, and the member lift frame is raised and lowered along the track.

12. The assembly method for a floating offshore wind power generation device according to claim 10, wherein in the member joining work, the gap created between the inner circumferential surface of the tower insertion hole and the outer circumferential surface of the existing tower is closed with a sliding closing member, and an extension sliding support portion placed on the sliding closing member is connected to the sliding support portion.

13. The assembly method for a floating offshore wind power generation device according to claim 10, wherein the tower member is suspended by a crane mounted on the member lift frame, and in that state, the tower member is slid along the slide support portion to the tower insertion hole.

14. The assembly method for a floating offshore wind power generation device according to claim 10, wherein the aforementioned frame for the member lift is divided into a plurality of frame members, the plurality of frame members are transported to the installation area and assembled, and after the assembly of the floating offshore wind power generation device is completed, the plurality of frame members are disassembled and removed.

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