JP6692484B1 - How to install an offshore wind turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for installing an offshore wind turbine that does not use an SEP ship. SOLUTION: A caisson, which is the basis of an offshore wind turbine, is installed at the installation position of the offshore wind turbine, and at this caisson, a plurality of tower members are assembled and blades are attached to the nacelle attached to the uppermost tower member. To do. [Selection diagram] Figure 1

Description

  The present invention relates to an offshore wind turbine installation method.

  Conventionally, a crane construction method using a SEP (Self-Elevating Platform) ship has been widely adopted for the construction of an offshore wind turbine used for offshore wind power generation. For example, in Patent Document 1, a tower in which all or some of electric components are attached to a tower on land, the tower on which the electric components are attached is loaded on an SEP ship, and the electric components are attached on the sea using a crane of the SEP ship is disclosed. The method of installation on the foundation is disclosed.

JP, 2017-89447, A

  However, the construction method using the SEP ship has a problem that the cost of the SEP ship is high. Specifically, work on the sea is easily affected by strong winds and high waves, and the work may be delayed depending on weather conditions. When renting an SEP ship, a delay in the process leads to an increase in cost. In addition, the size of wind turbines is increasing, and the number of SEP ships that can be used to construct such large wind turbines is scarce, leading to increased costs.

  In view of such circumstances, an object of the present invention is to provide an installation method for an offshore wind turbine that does not use an SEP ship.

  The present invention has been made to achieve the above object, and is characterized by the following.

The invention according to claim 1 is a method for installing an offshore wind turbine, in which a plurality of tower members made by dividing a tower of the offshore wind turbine in a height direction are assembled on the sea and installed, wherein the caisson is the basis of the offshore wind turbine. A caisson installation step of installing at the installation position of the offshore wind turbine, an assembly step of assembling the plurality of tower members at the caisson, a nacelle attached to the tower member at the uppermost stage , a blade outside the caisson. A blade attaching step for attaching

  The invention according to claim 2 is the method for installing an offshore wind turbine according to claim 1, wherein in the assembling step, a second stage from the top is provided below the uppermost tower member to which the nacelle is attached. It is characterized in that the following tower members are successively added and assembled.

  The invention according to claim 3 is the method for installing an offshore wind turbine according to claim 2, wherein in the assembling step, when the tower member is replenished from below, the assembled tower member is assembled by then. Lifting step, a placement step of placing a replenishing tower member under the assembled tower member lifted in the lifting step, and a lifting step in the lifting step on the tower member placed in the positioning step. A mounting step of mounting the assembled assembled tower member, the tower member arranged in the disposing step, and a joining step of joining the assembled tower member mounted in the mounting step. It is characterized by including.

The invention according to claim 4 is the method for installing the offshore wind turbine according to any one of claims 1 to 3, wherein the nacelle is attached to the uppermost tower member outside the caisson. It is characterized by including a process.

  The invention according to claim 5 is the method for installing the offshore wind turbine according to any one of claims 1 to 4, wherein the carrying-in step of carrying the tower member into the caisson from a carrier ship carrying the tower member. It is characterized by including.

  The invention according to claim 6 is the method for installing an offshore wind turbine according to claim 5, wherein the caisson is provided inside the caisson from a wall portion of the caisson to a position at which the replenishing tower member is arranged. A guide is formed to move the tower member carried into the container in a standing posture, and in the disposing step, the replenishing tower member is arranged using the guide.

  The invention according to claim 7 is the method for installing an offshore wind turbine according to claim 5 or 6, wherein the bottom of the carrier is seated outside the caisson when the carrier is docked. Is formed, and the carrying-in step is performed in a state where the bottom of the carrier is seated on the seating portion.

  The invention according to claim 8 is the method for installing an offshore wind turbine according to claim 7, wherein the carrier ship is formed with a guide rail for guiding the tower member to the caisson with which the carrier ship is docked. In the carrying-in step, the tower member is carried in using the guide rail.

  The invention according to claim 9 is the method for installing the offshore wind turbine according to any one of claims 1 to 8, wherein after the assembly of all the tower members is completed, It is characterized by including a fixing step of fixing to the caisson.

  The invention according to claim 10 is the method for installing the offshore wind turbine according to any one of claims 1 to 9, wherein at least one of the nacelle and the tower member is placed inside the caisson. And towing the caisson to the installation position of the offshore wind turbine.

  According to this invention, the caisson, which is the basis of the offshore wind turbine, is installed at the installation position of the offshore wind turbine, and at the caisson, the assembly of a plurality of tower members and the blade to the nacelle attached to the uppermost tower member are performed. Since the installation is performed, the offshore wind turbine can be installed without using the SEP ship.

It is a side view of an offshore wind turbine according to the present embodiment. (A) is a plan view of the caisson according to the present embodiment, and (B) is a side view of the caisson according to the present embodiment. It is a figure which shows a mode that the caisson concerning this embodiment is towed. (A) is a side view showing the caisson being installed, (B) is a plan view showing the caisson being installed, and (C) is a rear view showing the caisson being installed (nacelle). And excluding tower members). (A) is a plan view showing a carrier ship docked at a caisson, and (B) is a side view showing a carrier ship docked at a caisson. (A) is a plan view showing the appearance of the berth on the caisson, and (B) is a side view showing the appearance of the berth on the caisson. (A) is a plan view showing the appearance of the berth on the caisson, and (B) is a side view showing the appearance of the berth on the caisson. FIG. 9A is a plan view showing how the tower member is carried in from the carrier to the caisson, and FIG. 9B is a side view showing how the tower member is carried in from the carrier to the caisson. FIG. 6 is a side view showing how the tower member is carried into the caisson from the carrier. (A) is a plan view showing how the blade is attached to the nacelle, and (B) is a side view showing how the blade is attached to the nacelle. It is a side view which shows a mode that the lowermost tower member is arranged in an assembly position. It is a side view which shows a mode that the tower of the offshore windmill is fixed to the caisson.

  Embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, an installation method of the offshore wind turbine 100 shown in FIG. 1 will be described. The offshore wind turbine 100 includes a tower 110, a nacelle 120, blades 130, and a base caisson 200.

  The tower 110 is composed of six tower members 111A, 111B, 111C, 111D, 111E, and 111F divided in the height direction (hereinafter, the six tower members may be collectively referred to as a tower member 111). The tower member 111A is the uppermost tower member, the tower member 111B is the second tower member from the top, the tower member 111C is the third tower member from the top, and the tower member 111D is the top member. The tower member is the fourth-stage tower member, the tower member 111E is the fifth-stage tower member from the top, and the tower member 111F is the sixth-stage (lowermost) tower member from the top.

  The nacelle 120 stores a bearing, a power generator, and the like. The power generator includes a speed increaser that increases the rotational speed of the blade, a generator (induction generator, synchronous generator, etc.), and a monitoring device that monitors the operating status of the offshore wind turbine 100. The nacelle 120 is attached to the upper part of the uppermost tower member 111A. A plurality of blades 130 are attached to the nacelle 120.

  The caisson 200 will be described with reference to FIGS. The caisson 200 has a rectangular parallelepiped shape with an open top surface, and a bottom surface 201 and side walls 202 are formed of concrete. An assembly space 210 is formed in the center of the caisson 200 by the two partition walls 203A and 203B. The space other than the assembly space 210 inside the caisson 200 is an empty space 211.

  In the assembly space 210, the tower member 111 is assembled. Further, after the assembly is completed, the lowermost tower member 111F is fixed by being embedded in the assembly space 210, and the caisson 200 functions as a foundation of the offshore wind turbine 100. In this embodiment, concrete 207 is laid on the bottom surface 201 inside the caisson 200.

  A seating portion 204 is formed outside the caisson 200 so that the bottom of the carrier 300 can be seated when the carrier 300 described later is docked on the caisson 200.

  Hereinafter, each step of the installation method of the offshore wind turbine 100 will be described with reference to the drawings.

[1. Towing process]
The towing process will be described with reference to FIG. The towing process is a process of towing the caisson 200 to the installation position of the offshore wind turbine 100 with the nacelle 120 placed inside the caisson 200. In the assembly space 210 of the caisson 200, the tower member 111A and the nacelle 120 are loaded. Further, in the present embodiment, a jack mount 220 described later is assembled in the empty spaces 211 on both sides of the assembly space 210 of the caisson 200. However, the jack base 220 may be assembled at the installation position of the offshore wind turbine 100.

  The towing vessel 400 tows the caisson 200 to the installation position of the offshore wind turbine 100 with the caisson 200 floating above the sea surface. The tower member 111A and the nacelle 120 may be separately loaded on the caisson 200. If the caisson 200 can be balanced during towing, the nacelle 120 may be mounted on the tower member 111A as in the present embodiment. You may tow with the attached. Further, if the stacking is possible, the tower members 111 other than the tower member 111A may be stacked. In this embodiment, the lowermost tower member 111F is loaded. When the tower member 111 is loaded on the caisson 200, it is preferable to load the tower member 111 in a standing (vertical) posture rather than in a recumbent (horizontal) posture. This is because it is possible to omit the work of raising the tower member 111 at the installation position of the offshore wind turbine 100. Therefore, the nacelle 120 attached to the tower member 111A is attached with the wire 223 of the below-described wind turbine assembly jack 221 provided on the jack stand 220, and the standing posture of the tower member 111A is maintained.

[2. Caisson installation process]
The caisson installation process will be described with reference to FIGS. The caisson installation step is a step of installing the caisson 200, which is the basis of the offshore wind turbine 100, at the installation position of the offshore wind turbine 100. When the caisson 200 is towed to the installation position of the offshore wind turbine 100, seawater, earth and sand, concrete or the like is poured into the empty space 211 of the caisson 200 to increase its own weight, and the caisson 200 is landed on the seabed. At this time, when seawater is poured into the empty space 211, the caisson 200 can be floated by draining the seawater, and the work for discarding / collecting the offshore wind turbine 100 can be simplified. The side wall 202 of the caisson 200 is designed to be at least higher than the sea level at the installation position of the offshore wind turbine 100.

  Further, a seating shelf 410 on which the bottom of the carrier 300 can be seated is installed at a position slightly away from the caisson 200. Instead of installing the seating rack 410, a ship having a spud can be used. Further, the carrier 300 may carry a plurality of ships instead of one, depending on the sizes of the tower member 111 and the blades 130. The space of the deck 301 can be secured by dividing the carrier ship 300 into a plurality of ships and joining them. Specifically, as shown in FIGS. 6 (A) and 6 (B), the carrier 300 is divided into a carrier 420, a crane-carried carrier 430, and a rail-carried carrier 440. At this time, the barge 420, the crane-carried barge 430, and the rail-carried barge 440 have spuds 421, 431, and 441, respectively. Then, each of the pontoons seats one end of the ship on the seating portion 204, and at the other end of the ship, supports or stabilizes the hull by landing or piercing the spuds 421, 431, 441 on the seabed. In this case, the seating shelves 410 are unnecessary for these ships. Further, as shown in FIGS. 7A and 7B, when the SEP ship 450 with a crane having the spuds 451 at one end and the other end of the ship is used, the SEP ship 450 includes the seat portion 204 and the seat shelf 410. There is no need to seat the bottom of the ship. In this case, the seat portion 204 and the seat shelf 410 are unnecessary.

  The jack stand 220 is a wind turbine assembly jack 221A, B, C, D for lifting the tower member 111, the nacelle 120, and the like when assembling the offshore wind turbine 100 (these may be collectively referred to as a wind turbine assembly jack 221). ) And a tower member carrying jack 222 222 A, 222 B for carrying in the tower member 111 carried by the carrier ship 300, which will be described later, from the carrier ship 300 to the assembly space 210 (these are collectively referred to as a tower member carrying jack 222. Have).

  In the assembly space 210, an assembly position is defined, which is a position on the plane where the wind turbine assembly jack 221 lifts the tower member 111, the nacelle 120, and the like. The wind turbine assembly jack 221 lifts the tower member 111, the nacelle 120, and the like at the assembly position, and the tower member loading jack 222 is located at the assembly position below the tower member 111.

  Therefore, a guide 212 for moving the tower member 111 in the standing posture when the tower member carrying jack 222 arranges the tower member 111 from the side wall 202 of the caisson 200 to the assembly position inside the assembly space 210. Form. Any guide can be adopted as the guide 212 as long as it has a function of moving the tower member 111 in a standing posture. For example, a slope formed of concrete or the like or a metal guide rail can be used. Good. It should be noted that the guide 212 may be formed before the towing, as long as it does not interfere with the towing of the caisson 200.

[3. Nacelle mounting process]
The nacelle attaching step is a step of attaching the nacelle 120 to the uppermost tower member 111A. The nacelle 120 may be attached at the port, or may be attached to the caisson 200 after being towed to the installation position of the offshore wind turbine 100. In the former case, the nacelle 120 is attached to the uppermost tower member 111A, and the nacelle 120 is loaded on the caisson 200. In the latter case, the uppermost tower member 111A and the nacelle 120 are loaded on the caisson 200 separately. Will be done. In the former case, the nacelle mounting process at the site can be omitted, and the working time can be shortened.

[4. Carry-in process]
The carrying-in step will be described with reference to FIGS. The carrying-in step is a step of carrying the tower member 111 into the caisson 200 from the carrier 300 carrying the tower member 111. The carrier 300 carries the blades 130 of the offshore wind turbine 100 and the tower member 111 that is not mounted on the caisson 200, and carries it to the installation position of the offshore wind turbine 100. When the carrier 300 has moved to the installation position of the offshore wind turbine 100, the amount of ballast water is adjusted so that the bottom of the carrier is seated on the seat portion 204 and the seat shelf 410. At this time, as shown in FIG. 5 (A), the heights of the seating portion 204 and the seating shelf 410 are designed so that the deck 301 of the carrier 300 and the side wall 202 of the caisson 200 match in height. ..

  As shown in FIG. 5B, the deck 301 of the carrier 300 is provided with a rail 302 that guides the tower member 111 toward the assembly space 210 of the caisson 200. It is preferable that the tower member 111 loaded on the carrier 300 is carried on the rail 302 or in the vicinity thereof in a standing posture. In addition, a crane 303 is loaded on the carrier 300, and while the tower member 111 accommodated in a suspension frame 304 that can slide on the rail 302 is being lifted, the rail 302 is slid to near the assembly space 210 of the caisson 200. To the caisson 200.

[5. Assembly process]
The assembly process will be described with reference to FIGS. 5A, 5B, 8A, and 8B. The assembly process is a process of assembling the plurality of tower members 111 with the caisson 200. In the assembly process, the tower members 111 are assembled by sequentially adding the second and subsequent tower members 111 from the top below the uppermost tower member 111A to which the nacelle 120 is attached. The assembling process includes a lifting process of lifting the assembled tower member 111 assembled up to that time when the tower member 111 is replenished from below, and a tower to be added below the assembled tower member 111 lifted in the lifting process. A placement step of placing the member 111, a placement step of placing the assembled tower member 111 lifted in the lifting step on the tower member 111 placed in the placement step, and a tower member 111 placed in the placement step. And a joining step of joining the assembled tower member 111 placed in the placing step. Then, the tower member 111 is assembled by repeating the lifting step, the placing step, the placing step, and the joining step.

[5.1. Lifting process]
First, as shown in FIG. 5B, the wind turbine assembly jack 221 lifts the tower member 111 (the tower member 111A in FIGS. 5A and 5B). At this time, the tower member 111, which is loaded from the carrier 300, is lifted below the lowermost end of the lifted tower member 111 to a height at which the tower member 111 can be arranged in a standing posture.

[5.2. Placement process]
Next, as shown in FIGS. 8A and 8B, the tower member loading jack 222 includes the tower member 111 (the tower member 111B in FIGS. 8A and 8B) carried in from the carrier 300. It is lifted and lowered from the hanging frame 304, and placed at the assembly position 205. At this time, by arranging the tower member 111 using the guide 212, the tower member 111 can be moved in the standing posture and can be arranged at the assembly position 205. Although it is desirable to carry the tower member 111 in a standing posture, it is also possible to carry the tower member 111 in a lying state. Specifically, as shown in FIG. 9, while the tower member is being lifted by the tower member carry-in jack 222, the tower member is raised, and the tower member is hung again from the standing posture and placed at the assembly position 205. can do.

[5.3. Placement process]
Next, the wind turbine assembly jack 221 places the tower member 111A lifted in the lifting process on the tower member 111 (the tower member 111B in FIGS. 8A and 8B) arranged at the assembly position 205. To do.

[5.4. Joining process]
Next, the tower members 111A and 111B are joined by joining flange joints (not shown) formed on the tower members 111A and 111B, respectively.

[6. Blade installation process]
The blade mounting step will be described with reference to FIGS. 10 (A) and 10 (B). The blade attaching step is a step of attaching the blade 130 with the caisson 200 to the nacelle 120 attached to the uppermost tower member 111A. In the blade mounting step, when the tower member 111 is added and the nacelle 120 reaches the upper part of the jack rack 220, the blade 130 is mounted on the nacelle 120. That is, the blade 130 is attached at a stage before assembling all the tower members 111 (in FIG. 10, a stage at which the tower members 111A to 111C are assembled). This allows the blades 130 to be mounted at a lower position than when all the tower members 111 are assembled, so that a large-scale crane having an arm that reaches the top of the tower 110 is unnecessary, and a small-scale crane can be used. It's enough.

  When the height of the tower member 111 to be lifted in the lifting process is increased by sequentially adding the tower members 111, the tower member 111 is likely to shake sideways at the time of lifting. Therefore, an upper swing (not shown) is provided on the beam to which the wind turbine assembly jack 221 and the tower member carrying jack 222 of the jack base 220 are attached, and a lower swing 224 is provided below the pillar of the jack base 220. It is provided. The upper swing stop and the lower swing stop 224 suppress the lateral shake of the tower member 111 by holding the tower member 111.

[7. Fixed process]
The fixing step will be described with reference to FIGS. 11 and 12. The fixing step is a step of fixing the lowermost tower member 111F to the caisson 200 after all the tower members 111 have been assembled. When the tower member 111D and the tower member 111E are joined and the tower member 111A is lifted from the tower member 111A by the wind turbine assembly jack 221, the tower member 111F loaded on the caisson 200 is slid and placed at the assembly position 205. Next, the tower members 111A to 111E are placed on the tower member 111F, and the tower members 111E and 111F are joined to complete the assembly of all the tower members 111.

  As shown in FIG. 12, when the assembly of all the tower members 111 is completed and the tower 110 is formed, the lower portion of the tower 110 (the tower member 111F in the example of FIG. 12) is fixed to the caisson 200. Various fixing methods can be adopted. For example, the tower member 111F may be fixed to the concrete 207 on the bottom surface 201 of the caisson 200, and the concrete may be poured into the assembly space 210.

  With the above, the installation of the offshore wind turbine 100 is completed.

[8. Removal process]
After the installation of the offshore wind turbine 100 is completed, the jack platform 220 is disassembled by the crane 303 and loaded on the carrier 300, and the carrier 300 is separated from the caisson 200.

  As described above, the installation method of the offshore wind turbine 100 according to the present embodiment includes a caisson installation step of installing the caisson 200, which is the basis of the offshore wind turbine 100, at the installation position of the offshore wind turbine 100, and a plurality of tower members in the caisson 200. The process includes an assembling process of assembling 111, and a blade attaching process of attaching the blade 130 to the nacelle 120 attached to the uppermost tower member 111A with the caisson 200.

  Therefore, according to the method for installing the offshore wind turbine 100 of the present embodiment, the caisson 200 that is the basis of the offshore wind turbine 100 is installed at the installation position of the offshore wind turbine 100, and the caisson 200 assembles the plurality of tower members 111, Since the blade 130 is attached to the nacelle 120 attached to the uppermost tower member 111A, the offshore wind turbine 100 can be installed without using the SEP ship.

  Further, in the assembly process of the present embodiment, the tower members 111B-111F of the second and subsequent stages from the top are sequentially added and assembled below the uppermost tower member 111A to which the nacelle 120 is attached. Specifically, the assembly process includes a lifting process of lifting the assembled tower member 111 assembled up to that time when the tower member 111 is replenished from below, and a lower process of the assembled tower member 111 lifted in the lifting process. , A placement step of placing the additional tower member 111, a placement step of placing the assembled tower member 111 lifted in the lifting step on the tower member 111 placed in the placement step, and a placement step of the placement step. And the joining step of joining the assembled tower member 111 placed in the placing step.

  According to the installation method of the offshore wind turbine 100 of the present embodiment, the tower members can be replenished sequentially from the bottom by the wind turbine assembly jack 221 that lifts the tower member 111 assembled up to that point. Thus, when stacking the tower members 111A-111E in the second and subsequent stages from the bottom on the bottommost tower member 111F in the conventional manner, a large-scale crane having an arm extending to the top of the tower 110 is used. I need. That is, according to this embodiment, the tower member 111 can be assembled by a small-scale crane without the need for a large-scale crane.

Further, inside the caisson 200 of the present embodiment, from the side wall 202 of the caisson 200 (an example of “a wall portion”) to the assembly position 205 (an example of “a position where a tower member to be added is disposed”), the caisson 200 is loaded. A guide 212 for moving the tower member 111 to be moved in a standing posture is formed. In the arranging step, the tower member 111 to be added is arranged at the assembly position 205 using the guide 212.

  Therefore, according to the method of installing the offshore wind turbine 100 of the present embodiment, the tower member 111 carried in the caisson 200 can be arranged in the assembly position 205 while standing, so that the tower carried in a recumbent posture, for example. Since the work of setting the member 111 in the standing posture is unnecessary and the placement process can be immediately followed by the placement process, the work time can be shortened.

  Furthermore, a seating portion 204 on which the bottom of the carrier 300 can be seated when the carrier 300 is docked on the caisson 200 is formed outside the caisson 200 of the present embodiment, and at a position slightly away from the caisson 200. The seating shelf 410 on which the bottom of the carrier 300 can be seated is installed, and the carrying-in step is performed with the bottom of the carrier 300 seated on the seating portion 204 and the seating rack 410.

  Therefore, according to the method for installing the offshore wind turbine 100 of the present embodiment, when the material such as the tower member 111 is carried into the caisson 200 from the carrier 300, the carrier 300 is less likely to sway, so that the carrying-in work can be performed efficiently. it can. In the present embodiment, the carrying-in step is performed while the bottom of the carrier 300 is seated on both the seating portion 204 and the seating shelf 410, but only one of the seating portion 204 and the seating shelf 410 is used. The loading process may be performed with the bottom of the ship 300 seated.

  Furthermore, the carrier 300 of the present embodiment is formed with a rail 302 (an example of “guide rail”) that guides the tower member 111 to the caisson 200 on which the carrier 300 is docked, and the rail 302 is used in the carrying-in step. Then, the tower member 111 is carried in.

  Therefore, according to the method for installing the offshore wind turbine 100 of this embodiment, the tower member 111 can be smoothly carried in from the carrier 300 to the caisson 200.

  Furthermore, the method for installing the offshore wind turbine 100 of the present embodiment includes a fixing step of fixing the lowermost tower member 111F to the caisson 200 after all the tower members 111 have been assembled.

  Therefore, according to the installation method of the offshore wind turbine 100 of the present embodiment, the caisson 200 can be used as the basis of the offshore wind turbine 100.

  Furthermore, the installation method of the offshore wind turbine 100 of the present embodiment includes a towing step of towing the caisson 200 to the installation position of the offshore wind turbine with at least one of the nacelle 120 and the tower member 111 placed inside the caisson 200. ..

  Therefore, according to the method for installing the offshore wind turbine 100 of the present embodiment, the caisson 200 can be used for carrying the nacelle 120 and the tower member 111.

100 Offshore wind turbine 110 Tower 111 Tower member 120 Nacelle 130 Blade 200 Caisson 201 Bottom 202 Side wall 203 Partition wall 204 Seating portion 205 Assembly position 206 Temporary stand 207 Concrete 210 Assembly space 211 Empty space 212 Guide 220 Jack stand 221 Wind turbine assembly jack 222 Tower Jacks for carrying in parts 223 Wires 224 Lower swing 300 Carriers 301 Deck 302 Rails 303 Cranes 304 Lifting frames 400 Towing vessels 410 Seating shelves 420 Carriers 421 Spuds 430 Cranes ponders 431 Spuds 440 Rails ponders 441 Spuds 442 Rails 450 SEP ship with crane 451 spud

Claims (10)

A method for installing an offshore wind turbine, which comprises assembling a plurality of tower members made by dividing a tower of an offshore wind turbine in a height direction on the sea and installing the assembly,
A caisson installation step of installing a caisson, which is the basis of the offshore wind turbine, at the installation position of the offshore wind turbine;
An assembly process of assembling the plurality of tower members with the caisson,
A nacelle mounted on the tower member top, and the blade mounting step of mounting a blade in the upper outside of the caisson,
A method for installing an offshore wind turbine, comprising: The method for installing an offshore wind turbine according to claim 1, wherein
In the assembling step, a method for installing an offshore wind turbine is characterized in that the tower members at the second and subsequent stages from the top are sequentially added below the uppermost tower member to which the nacelle is attached to assemble. The method for installing the offshore wind turbine according to claim 2,
The assembly process is
When adding the tower member from below, a lifting step of lifting the assembled tower member assembled up to that point,
An arrangement step of arranging a tower member to be added under the assembled tower member lifted in the lifting step,
A mounting step of mounting the assembled tower member lifted in the lifting step on the tower member arranged in the arrangement step,
The tower member arranged in the arrangement step, a joining step of joining the assembled tower member placed in the placing step,
A method for installing an offshore wind turbine, comprising: An offshore wind turbine installation method according to any one of claims 1 to 3,
A method for installing an offshore wind turbine, comprising a nacelle mounting step of mounting the nacelle on the uppermost tower member outside the caisson. A method for installing an offshore wind turbine according to any one of claims 1 to 4,
A method of installing an offshore wind turbine, comprising a carrying-in step of carrying in the tower member from a carrier ship carrying the tower member to the caisson. The method for installing an offshore wind turbine according to claim 5, wherein
Inside the caisson, a guide for moving the tower member carried in the caisson in a standing posture is formed from the wall portion of the caisson to a position where the tower member to be added is arranged.
In the arranging step, an offshore wind turbine installation method is characterized in that the replenishing tower member is arranged using the guide. A method for installing an offshore wind turbine according to claim 5 or 6,
Outside the caisson, a seating portion is formed on which the bottom of the carrier can sit when the carrier is docked,
The method of installing an offshore wind turbine, wherein the carrying-in step is performed in a state where a bottom of the carrier is seated on the seat portion. The method for installing an offshore wind turbine according to claim 7,
The carrier is formed with a guide rail for guiding the tower member to the caisson where the carrier is docked,
In the carrying-in step, the tower member is carried in by using the guide rail, and the offshore wind turbine installation method. A method for installing the offshore wind turbine according to any one of claims 1 to 8,
A method for installing an offshore wind turbine, comprising a fixing step of fixing the lowermost tower member to the caisson after assembly of all the tower members is completed. A method for installing an offshore wind turbine according to any one of claims 1 to 9,
A method of installing an offshore wind turbine, comprising a towing step of towing the caisson to a position where the offshore wind turbine is installed, with at least one of the nacelle and the tower member placed inside the caisson.

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