JP2021076043A - Method for installing offshore wind turbine - Google Patents

Abstract

To provide a method for installing an offshore wind turbine without using a SEP ship.SOLUTION: A method for installing an offshore wind turbine includes the steps of: installing a caisson serving as a foundation of a wind turbine in an installation location of the wind turbine; and using the caisson to assemble multiple tower members and fit a blade to a nacelle fitted to the uppermost stage tower member.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for installing an offshore wind turbine.

Conventionally, the crane method using a SEP (Self-Elevating Platform) ship has been widely adopted for the construction of offshore wind turbines used for offshore wind power generation. For example, Patent Document 1 describes a tower in which all or part of an electric component is attached to a tower on land, a tower with the electric component attached is loaded on a SEP ship, and an electric component is attached by using a crane of the SEP ship at sea. The construction method to be installed on the foundation is disclosed.

JP-A-2010-59692

However, the construction method using the SEP ship has a problem that the cost for the SEP ship is high. Specifically, work at sea is easily affected by strong winds and high waves, and work may be delayed due to weather conditions, and when renting an SEP ship, delays in the process lead to increased costs. In addition, the size of wind turbines is increasing, and the scarcity of SEP vessels that can be used to construct such large wind turbines leads to an increase in costs.

In view of these circumstances, an object of the present invention is to provide a method for installing 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 by assembling and installing a plurality of tower members formed by dividing the tower of the offshore wind turbine in the height direction at sea, and is a caisson which is a basis of the offshore wind turbine. The caisson installation step of installing the offshore wind turbine, the assembly step of assembling the plurality of tower members at the caisson, and the blades attached to the nacelle attached to the tower member at the uppermost stage by the caisson. It is characterized by including a blade mounting process.

The invention according to claim 2 is the method for installing an offshore wind turbine according to claim 1. In the assembly process, the second step from the top is under the uppermost tower member to which the nacelle is attached. It is characterized in that the following tower members are sequentially 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 assembly step, when the tower member is added from below, the assembled tower member has been assembled so far. A lifting step of lifting the tower member, an arrangement step of arranging a tower member to be added under the assembled tower member lifted in the lifting step, and a lifting step of the tower member arranged in the arrangement step in the lifting step. A mounting step of mounting the assembled tower member, and a joining step of joining the tower member placed in the placement step and the assembled tower member mounted in the previously described mounting step. It is characterized by including.

The invention according to claim 4 is the method for installing an offshore wind turbine according to any one of claims 1 to 3, wherein the nacelle attachment step of attaching the nacelle to the uppermost tower member by the caisson is performed. It is characterized by including.

The invention according to claim 5 is the method for installing an offshore wind turbine according to any one of claims 1 to 4, wherein the tower member is carried into the caisson from a carrier 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 inside the caisson from a wall portion of the caisson to a position where the tower member to be added is arranged. A guide is formed to move the tower member carried into the vehicle in a standing posture, and the arrangement step is characterized in that the tower member to be added is arranged by 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 can be seated outside the caisson when the carrier is berthed. Is formed, and the carry-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 is formed with a guide rail for guiding the tower member to the caisson where the carrier berths. The carry-in step is characterized in that the tower member is carried in using the guide rail.

The invention according to claim 9 is the method for installing an offshore wind turbine according to any one of claims 1 to 8, wherein after all the tower members have been assembled, the lowermost tower member is attached. It is characterized by including a fixing step of fixing to the caisson.

The invention according to claim 10 is the method for installing an 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. It is characterized by including a towing process of towing the caisson to the installation position of the offshore wind turbine.

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

It is a side view of the offshore wind turbine which concerns on this 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 the state that the caisson which concerns on this embodiment is towed. (A) is a side view showing a state in which a caisson is installed, (B) is a plan view showing a state in which a caisson is installed, and (C) is a rear view (nacelle) showing a state in which a caisson is installed. And tower members). (A) is a plan view showing a state in which the carrier berths at the caisson, and (B) is a side view showing a state in which the carrier berths at the caisson. (A) is a plan view showing how the pontoon berthed at the caisson, and (B) is a side view showing how the pontoon berthed at the caisson. (A) is a plan view showing how the pontoon berthed at the caisson, and (B) is a side view showing how the pontoon berthed at the caisson. (A) is a plan view showing how the tower member is carried from the carrier to the caisson, and (B) is a side view showing how the tower member is carried from the carrier to the caisson. Is a side view showing how the tower members are carried from the carrier to the caisson. (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 how the tower member of the lowermost stage is arranged at an assembly position. It is a side view which shows how the tower of an offshore wind turbine is fixed to a caisson.

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

In this embodiment, the 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, a blade 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 tower member 111D from the top. 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 (bottom-stage) tower member from the top.

The nacelle 120 stores bearings, power generation devices, and the like. The power generation device includes a speed increaser that raises the rotation 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. Further, a plurality of blades 130 are attached to the nacelle 120.

The caisson 200 will be described with reference to FIGS. 2 (A) and 2 (B). The caisson 200 has a rectangular parallelepiped shape with an open upper surface, and the bottom surface 201 and the side wall 202 are formed of concrete. Further, in the center of the inside of the caisson 200, an assembly space 210 is formed by 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 buried in the assembly space 210, and the caisson 200 functions as the basis 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, which will be described later, berths at 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. The tower member 111A and the nacelle 120 are loaded in the assembly space 210 of the caisson 200. Further, in the present embodiment, the jack mount 220, which will be described later, is assembled in the empty spaces 211 on both sides of the assembly space 210 of the caisson 200. However, the jack stand 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 on the sea surface. The tower member 111A and the nacelle 120 may be loaded separately on the caisson 200, or if the caisson 200 can be balanced at the time of towing, the nacelle 120 may be loaded on the tower member 111A as in the present embodiment. You may tow with the attached. Further, if it is possible to load the tower member 111 other than the tower member 111A, the tower member 111 may be loaded. In the present embodiment, the lowermost tower member 111F is loaded. When loading the tower member 111 on the caisson 200, it is preferable to load the tower member 111 in a standing (vertical) posture rather than in a lying (horizontal) posture. This is because the work of erecting the tower member 111 can be omitted at the installation position of the offshore wind turbine 100. Therefore, the wire 223 of the wind turbine assembly jack 221 described later provided on the jack stand 220 is attached to the nacelle 120 attached to the tower member 111A, 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. 4 (A) to 4 (C). The caisson installation process is a process 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. After the caisson 200 is towed to the installation position of the offshore wind turbine 100, the caisson 200 is landed on the seabed by pouring seawater, earth and sand, concrete, or the like into the empty space 211 of the caisson 200 to increase its own weight. At this time, when seawater is filled in the empty space 211, the caisson 200 can be levitated by draining the seawater, and the work for disposing and 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.

In addition, 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 also be used. Further, the carrier 300 may be transported by a plurality of ships instead of one depending on the size of the tower member 111 and the blade 130. The space of the deck 301 can be secured by dividing the carrier 300 into a plurality of ships and joining them. Specifically, as shown in FIGS. 6A and 6B, the carrier 300 is divided into a carrier 420, a crane-equipped carrier 430, and a rail-equipped carrier 440. At this time, the pontoon 420, the pontoon 430 with a crane, and the pontoon 440 with rails shall have spuds 421, 431, and 441, respectively. Then, each pontoon supports and stabilizes the hull by seating one end of the ship on the seating portion 204 and landing or piercing the spuds 421, 431, and 441 on the seabed for the other end of the ship. In this case, the seating rack 410 is not required for these ships. Further, as shown in FIGS. 7A and 7B, when the SEP ship 450 with a crane having spuds 451 at one end and the other end of the ship is used, the SEP ship 450 has a seating portion 204 and a seating shelf 410. There is no need to sit on the bottom of the ship. In this case, the seating portion 204 and the seating shelf 410 become unnecessary.

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

The assembly space 210 is defined as an assembly position where the windmill assembly jack 221 is located on a plane for lifting the tower member 111, the nacelle 120, and the like. The wind turbine assembly jack 221 lifts the tower member 111, the nacelle 120, etc. at the assembly position, and the carried-in tower member 111 is arranged at the assembly position below the tower member carry-in jack 222.

Therefore, inside the assembly space 210, when the tower member carry-in jack 222 arranges the tower member 111 at the assembly position from the side wall 202 of the caisson 200, the guide 212 for moving the tower member 111 in a standing posture is provided. Form. As the guide 212, any one can be adopted 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. May be good. The guide 212 may be formed before the towing of the caisson 200 as long as it does not interfere with the towing of the caisson 200.

[3. Nacelle mounting process]
The nacelle mounting step is a step of mounting the nacelle 120 on the uppermost tower member 111A. The nacelle 120 may be installed at the port, or may be installed at the caisson 200 after being towed to the installation position of the offshore wind turbine 100. In the former case, the nacelle 120 is mounted on the caisson 200 with the uppermost tower member 111A attached, and in the latter case, the uppermost tower member 111A and the nacelle 120 are loaded separately on the caisson 200. 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 carry-in process will be described with reference to FIGS. 5 (A) and 5 (B). The carry-in process is a step of carrying the tower member 111 into the caisson 200 from the carrier 300 that carries the tower member 111. The carrier 300 loads the blade 130 of the offshore wind turbine 100 and the tower member 111 that is not loaded on the caisson 200, and transports the tower member 111 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 bottom of the carrier is set to be seated on the seating portion 204 and the seating shelf 410 by adjusting the amount of ballast water. At this time, as shown in FIG. 5A, the heights of the seating portion 204 and the seating shelf 410 are designed so that the heights of the deck 301 of the carrier 300 and the side wall 202 of the caisson 200 match. ..

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. The tower member 111 loaded on the carrier 300 is preferably transported in a standing posture on or near the rail 302. Further, a crane 303 is loaded on the carrier 300, and while lifting the tower member 111 housed in the suspension frame 304 that can slide on the rail 302, the rail 302 is slid and the vicinity of the assembly space 210 of the caisson 200. And carry it into the caisson 200.

[5. Assembly process]
The assembly process will be described with reference to FIGS. 5 (A) and 5 (B) and FIGS. 8 (A) and 8 (B). The assembly process is a process of assembling a plurality of tower members 111 at the caisson 200. In the assembling step, the tower member 111 of the second and subsequent stages from the top is sequentially added under the tower member 111A of the uppermost stage to which the nacelle 120 is attached to assemble the tower member 111. The assembly process includes a lifting process for lifting the assembled tower member 111 assembled so far when the tower member 111 is added from below, and a tower to be added under the assembled tower member 111 lifted in the lifting process. The placement step of arranging the member 111, the placement step of placing the assembled tower member 111 lifted in the lifting process on the tower member 111 arranged in the placement process, and the tower member 111 arranged in the placement process. , A joining step of joining the assembled tower member 111 mounted in the mounting step. Then, the tower member 111 is assembled by repeating the lifting process, the arranging process, the mounting process, and the joining process.

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

[5.2. Placement process]
Next, as shown in FIGS. 8A and 8B, the tower member carry-in jack 222 is a tower member 111 carried in from the carrier 300 (tower member 111B in FIGS. 8A and 8B). While lifting it, it is lowered from the suspension 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 a standing posture and arranged at the assembly position 205. It is desirable that the tower member 111 is carried in a standing posture, but it is also possible to carry in the tower member 111 in a laid state. Specifically, as shown in FIG. 9, while hoisting the tower member with the tower member carry-in jack 222, while raising the tower member, the tower member is hung again from the standing posture and placed at the assembly position 205. can do.

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

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

[6. Blade mounting process]
The blade mounting process will be described with reference to FIGS. 10A and 10B. The blade attaching step is a step of attaching the blade 130 to the nacelle 120 attached to the uppermost tower member 111A by the caisson 200. In the blade attaching step, the tower member 111 is added, and when the nacelle 120 reaches the upper part of the jack stand 220, the blade 130 is attached to the nacelle 120. That is, the blade 130 is attached at the stage before assembling all the tower members 111 (in FIG. 10, the stage where the tower members 111C are assembled from the tower members 111A). This allows the blade 130 to be mounted at a lower position than when all tower members 111 have been assembled, eliminating the need for a large crane with an arm that reaches the top of the tower 110, with a small crane. That's enough.

As the tower members 111 are sequentially added and the height of the tower members 111 to be lifted in the lifting process increases, the tower members 111 tend to swing laterally during lifting. Therefore, an upper anti-vibration (not shown) is provided on the beam to which the wind turbine assembly jack 221 and the tower member carry-in jack 222 of the jack mount 220 are attached, and the lower anti-vibration 224 is provided below the pillar of the jack mount 220. It is provided. The upper anti-vibration and the lower anti-vibration 224 suppress the lateral vibration of the tower member 111 by holding the tower member 111.

[7. Fixing process]
The fixing process 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. After joining the tower member 111D and the tower member 111E and lifting the tower member 111E from the tower member 111A by the wind turbine assembly jack 221, the tower member 111F loaded on the caisson 200 is slid and arranged at the assembly position 205. Next, the tower members 111E to the tower members 111A are placed on the tower members 111F, and the tower members 111E and the tower members 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 (tower member 111F in the example of FIG. 12) is fixed to the caisson 200. Various methods can be adopted as the fixing method. 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]
When the installation of the offshore wind turbine 100 is completed, the jack mount 220 is disassembled by the crane 303, 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 of 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 assembly step of assembling the 111 and the blade mounting step of mounting the blade 130 with the caisson 200 to the nacelle 120 mounted on the uppermost tower member 111A are included.

Therefore, according to the installation method of the offshore wind turbine 100 of the present embodiment, the caisson 200, which 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 is used to assemble a 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 a SEP ship.

Further, in the assembly process of the present embodiment, the tower members 111B-111F in the second and subsequent stages from the top are sequentially added and assembled under the tower member 111A in the uppermost stage to which the nacelle 120 is attached. Specifically, the assembly process includes a lifting process for lifting the assembled tower member 111 assembled so far when the tower member 111 is added from below, and a lowering of the assembled tower member 111 lifted in the lifting process. The tower member 111 to be added is placed in the arrangement step, the assembled tower member 111 lifted in the lifting step is placed on the tower member 111 arranged in the placement step, and the assembled tower member 111 is placed in the placement step. It includes a joining step of joining the tower member 111 and the assembled tower member 111 mounted in the mounting step.

According to the installation method of the offshore wind turbine 100 of the present embodiment, the tower members can be sequentially added from the bottom by the wind turbine assembly jack 221 that lifts the tower members 111 assembled up to that point. When the tower members 111A-111E of the second and subsequent stages from the bottom are sequentially stacked on the lowermost tower member 111F as in the conventional case, a large-scale crane having an arm extending to the uppermost part of the tower 110 is used. I need. That is, according to the present 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, the caisson 200 is carried from the side wall 202 of the caisson 200 (an example of the "wall portion") to the assembly position 205 (an example of the position where the tower member to be added is arranged). A guide 212 for moving the tower member 111 to be moved in a standing posture is formed, and in the arrangement process, the tower member 111 to be added is arranged at the assembly position 205 by using the guide 212.

Therefore, according to the installation method of the offshore wind turbine 100 of the present embodiment, the tower member 111 carried into the caisson 200 can be arranged at the assembly position 205 in the standing posture. Therefore, for example, the tower carried in the caisson 200 in the lying posture. Since the work of putting the member 111 in the standing posture is not required and the mounting step can be immediately performed after the placement step, the working time can be shortened.

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

Therefore, according to the installation method of the offshore wind turbine 100 of the present embodiment, the carrier 300 is less likely to shake when the materials such as the tower member 111 are brought into the caisson 200 from the carrier 300, so that the carry-in work and the like can be efficiently performed. it can. In the present embodiment, the carrying-in process is performed with the bottom of the carrier 300 seated on both the seating portion 204 and the seating shelf 410, but the carrier vessel is placed on only one of the seating portion 204 and the seating shelf 410. The loading process may be performed with the bottom of 300 ships seated.

Furthermore, the carrier 300 of the present embodiment is formed with a rail 302 (an example of a "guide rail") that guides the tower member 111 to the caisson 200 where the carrier 300 berths, and the rail 302 is used in the carry-in process. Then, the tower member 111 is carried in.

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

Furthermore, the installation method of 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 mounted inside the caisson 200. ..

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

100 Offshore Wind Crane 110 Tower 111 Tower Member 120 Nasser 130 Blade 200 Caisson 201 Bottom Side 202 Side Sides 203 Partition Wall 204 Seating 205 Assembly Position 206 Temporary Stand 207 Concrete 210 Assembly Space 211 Empty Space 212 Guide 220 Jack Mount 221 Wind Crane Assembly Jack Jack for carrying parts 223 Wire 224 Lower vibration stop 300 Carrier 301 Deck 302 Rail 303 Crane 304 Suspension frame 400 Towing vessel 410 Seating shelf 420 Carrier 421 Spad 430 Crane-equipped vessel 431 Spad 440 Rail-equipped vessel 441 Spad 442 Rail 450 SEP ship with crane 451 spud

JP-A-2017-89447

The invention according to claim 1 is a method for installing an offshore wind turbine by assembling and installing a plurality of tower members formed by dividing the tower of the offshore wind turbine in the height direction at sea, and is a caisson which is a basis of the offshore wind turbine. The caisson installation step of installing the offshore wind turbine, the assembly step of assembling the plurality of tower members at the caisson, and the nacelle attached to the tower member at the uppermost stage, the blades above and outside the caisson. It is characterized by including a blade mounting process for mounting the.

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

Claims (10)

It is an installation method of an offshore wind turbine that assembles and installs a plurality of tower members formed by dividing the tower of an offshore wind turbine in the height direction at sea.
The caisson installation process of installing the caisson that is the basis of the offshore wind turbine at the installation position of the offshore wind turbine, and the caisson installation process.
Assembling process of assembling the plurality of tower members in the caisson and
The blade mounting process of mounting the blade with the caisson to the nacelle mounted on the tower member on the uppermost stage,
An offshore wind turbine installation method characterized by including. The method for installing an offshore wind turbine according to claim 1.
The assembly step is a method for installing an offshore wind turbine, which comprises sequentially adding and assembling the tower members of the second and subsequent stages from the top under the tower member of the uppermost stage to which the nacelle is attached. The method for installing an offshore wind turbine according to claim 2.
The assembly process is
When adding the tower member from below, the lifting process of lifting the assembled tower member assembled so far, and
An arrangement step of arranging the tower member to be added under the assembled tower member lifted in the lifting step, and
A mounting step of mounting the assembled tower member lifted in the lifting step on the tower member placed in the placement step, and a mounting step.
A joining step of joining the tower member placed in the placement step and the assembled tower member placed in the above-described placement step.
An offshore wind turbine installation method characterized by including. The method for installing an offshore wind turbine according to any one of claims 1 to 3.
A method for installing an offshore wind turbine, which comprises a nacelle mounting step of mounting the nacelle on the uppermost tower member at the caisson. The method for installing an offshore wind turbine according to any one of claims 1 to 4.
A method for installing an offshore wind turbine, which comprises a carry-in step of carrying the tower member into the caisson from a carrier carrying the tower member. The method for installing an offshore wind turbine according to claim 5.
Inside the caisson, a guide is formed to move the tower member carried into the caisson in a standing posture from the wall portion of the caisson to a position where the tower member to be added is arranged.
The method for installing an offshore wind turbine, which comprises arranging the tower member to be added by using the guide in the arranging step. The method for installing an offshore wind turbine according to claim 5 or 6.
A seating portion is formed on the outside of the caisson so that the bottom of the carrier can be seated when the carrier is berthed.
The loading step is a method for installing an offshore wind turbine, characterized in that the bottom of the carrier is seated on the seating portion. The method for installing an offshore wind turbine according to claim 7.
The carrier is formed with a guide rail that guides the tower member to the caisson where the carrier berths.
A method for installing an offshore wind turbine, characterized in that the tower member is carried in using the guide rail in the carry-in step. The method for installing an offshore wind turbine according to any one of claims 1 to 8.
A method for installing an offshore wind turbine, which comprises a fixing step of fixing the tower member at the bottom stage to the caisson after all the tower members have been assembled. The method for installing an offshore wind turbine according to any one of claims 1 to 9.
A method for installing an offshore wind turbine, which comprises a towing step of towing the caisson to an installation position of the offshore wind turbine with at least one of the nacelle and the tower member placed inside the caisson.

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