JP6790217B1 - Tower assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tower assembling method capable of assembling a plurality of tower members formed by dividing a tower of an offshore windmill in the height direction in land such as a port where ground improvement work and foundation pile driving cannot be performed. SOLUTION: A plurality of tower members formed by dividing a tower of an offshore wind turbine in the height direction are assembled by a pedestal with a jack constructed on the pedestal based on a pedestal installed on the ground. [Selection diagram] Fig. 3

Description

The present invention relates to a method for assembling a tower of an offshore wind turbine.

Conventionally, offshore wind turbines used for offshore wind power generation are assembled at the port as much as possible and then transported to the installation site by a carrier in order to reduce the assembly work at sea. In particular, by assembling the tower portion of the wind turbine, which is tall and heavy, at the port, the work at sea can be omitted and the installation cost can be suppressed.

On the other hand, since the tower and the gantry and crane (lifting machine) used for assembling the tower are large in size and heavy, it is required to assemble the tower using them on solid ground.

However, ports are often constructed in landfills and have problems such as weak ground and low bearing capacity. Therefore, if it is a crane used for assembling a tower, ground improvement work is required, and if it is a pedestal used for assembling a tower, it is necessary to build a solid foundation. Under such circumstances, Patent Document 1 discloses a technique relating to foundation piles.

JP-A-2019-183510

However, the port is generally managed by the national government and local governments, and it is desirable that there is no ground improvement work or foundation pile driving.

In view of these circumstances, the present invention is capable of assembling a plurality of tower members formed by dividing an offshore wind turbine tower in the height direction on land such as a port where ground improvement work or foundation pile driving is not possible. The challenge is to provide a method.

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 tower assembling method for assembling a plurality of tower members formed by dividing a tower of an offshore windmill in the height direction on land, based on a pedestal installed on the ground. Including the assembly process of assembling the plurality of tower members with the pedestal with jacks constructed in the above, the pedestal has a plan view grid shape, and a mat type air jack is installed in each gap of the grid. It is a feature.

The invention according to claim 2 is the tower assembly method according to claim 1, wherein the pressure of each of the mat-type air jacks is monitored, and the pressure of the mat-type air jack whose pressure has decreased is controlled to be increased. It is characterized by including a process .

The invention according to claim 3 is the tower assembly method according to claim 1 or 2, wherein the pedestal and a part of the jacked pedestal are constructed so as to project from the land side to the sea side. It is a feature.

The invention according to claim 4 is the tower assembly method according to claim 3, wherein a portion of the pedestal and the jacked pedestal that protrudes from the land side to the sea side has a bottom missing. The floating structure that is the basis of the floating body of the offshore wind turbine is characterized in that it can enter the portion from the sea side .

The invention according to claim 5 is the tower assembly method according to any one of claims 1 to 4, wherein the tower member or the tower is supported by a support means, and the support means is the tower. It is characterized in that it moves horizontally while supporting the tower member or the tower as the member or the tower moves .

The invention according to claim 6 is a rack-equipped frame used in a tower assembly method for assembling a plurality of tower members formed by dividing a tower of an offshore windmill in the height direction on land, and the tower member at the uppermost stage. A pedestal installed on the ground having an assembly area for assembling the tower by sequentially adding the tower members in the second and subsequent stages from the top, and a jack for lifting the tower members in the assembly area. The pedestal is constructed on the pedestal based on the above, the jack is provided at a position lower than the height of the tower, the pedestal has a plan view grid shape, and a mat type air jack is installed in each gap of the grid. It is characterized by being done.

According to the present invention, since a plurality of tower members are assembled on a pedestal with a jack built on the pedestal based on the pedestal installed on the ground, ground improvement work and foundation piles cannot be driven into a port or the like. You can assemble an offshore windmill tower on land.

It is a side view of the offshore wind turbine which concerns on this embodiment. It is a top view of the pedestal which concerns on this embodiment. It is a figure which shows the state at the time of assembling the tower in the pedestal with a jack which concerns on this embodiment. It is a figure which shows the state at the time of assembling the tower in the pedestal with a jack which concerns on this embodiment. It is a figure which shows the state at the time of assembling the tower in the pedestal with a jack which concerns on this embodiment. It is a figure which shows the state at the time of assembling the tower in the pedestal with a jack which concerns on this embodiment. (A) and (B) are plan views of a pedestal and a pedestal with a jack according to the present embodiment. (A) is a plan view of the guide slider according to the present embodiment, (B) is a partial side view of the guide slider according to the present embodiment, and (C) is an arrow A view of the guide slider according to the present embodiment. It is a figure. (A) is a plan view of the horizontal support device (closed state) according to the present embodiment, and (B) is a plan view of the horizontal support device (open state) according to the present embodiment. It is a figure which shows the state at the time of carrying out the tower which concerns on this embodiment to an SEP ship. It is a figure which shows the state at the time of attachment to the floating structure of the offshore wind turbine which concerns on this embodiment.

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

In this embodiment, a method of assembling the tower of the offshore wind turbine will be described. As shown in FIG. 1, the offshore wind turbine 100 includes a tower 110, a nacelle 120, and a blade 130. The tower 110 is, for example, a tall tower-like structure of about 100 m.

The tower 110 is composed of three tower members 111A, 111B, and 111C divided in the height direction (hereinafter, the three 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, and the tower member 111C is the third tower member (lowermost) 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 pedestal 10 will be described with reference to FIG. The pedestal 10 functions as a pedestal on which a heavy object such as a pedestal with a jack, a tower 110, or a crawler crane, which will be described later, is placed on a land with weak ground (a port in the present embodiment). The pedestal 10 is made of steel and is installed on the ground to widely disperse the load from the jacked pedestal or the crawler crane to the ground. Further, the pedestal 10 has a plan view grid shape, and a mat type air jack (not shown) is installed in each gap 11 of the grid, so that the load can be uniformly distributed over the entire inside of the gap 11. Further, the mat type air jack is connected to a monitoring monitor (not shown) for monitoring the air pressure and a control device (not shown) for controlling the air pressure (these are integrated devices). If the ground sinks and the air pressure drops, the sinking of the pedestal 10 can be suppressed by increasing the air pressure. The surface pressure may be increased by pouring sand or concrete into the gap 11. Further, the gap 11 for installing the mat type air jack and the gap 11 for pouring sand or concrete may be arranged so as to be evenly dispersed.

A pedestal 10, a crawler crane 20, and a jacked pedestal 30 used for assembling and storing the tower 110 will be described with reference to FIGS. 3-11. In addition, in FIG. 3-FIG. 6, FIG. 10, and FIG. 11, the left side of the paper surface corresponds to the sea side.

The crawler crane 20 is arranged on the pedestal 10.

The pedestal 30 with jacks is built on the pedestal 10 based on the pedestal 10. That is, the foundation of the pedestal 30 with jacks is not directly provided on the ground. The gantry 30 with a jack prevents the tower member 111 and the tower 110 from rolling or tipping over, the jack 31 that lifts the tower member 111 and the tower 110 by the strand 32, the trolley 33 that moves the tower member 111 and the tower 110, and the tower member 111 and the tower 110 being assembled. It has a support means (guide slider 34 and horizontal support device 60).

The pedestal 30 with jacks has three areas, a receiving area 41, an assembly area 42, and a storage area 43. The receiving area 41 is an area where the tower member 111 is carried in. The assembly area 42 is an area for assembling the tower 110 by sequentially adding the tower members 111B and 111C of the second and subsequent stages from the top under the tower member 111A of the uppermost stage. The storage area 43 is an area for storing the tower 110 when the assembly of the tower 110 is completed in the assembly area 42. In this way, the receiving area 41, the assembly area 42, and the storage area 43 are arranged in order from the land side to the sea side, and since the storage area 43 is arranged on the sea side, the ship from the storage area 43 to the sea. The work efficiency when loading the tower 110 on the above is high.

The storage area 43 will be described with reference to FIGS. 7A and 7B. The receiving area 41, the assembly area 42, and the storage area 43 are arranged in this order from right to left on the paper in FIG. 7. Further, the storage area 43 has a space for storing two towers 110 for five rows in the vertical direction of the paper surface of FIG. 7, and can store two × 5 rows = 10 towers 110. It is possible (see FIG. 7B).

Further, the jacked pedestal 30 corresponding to the load receiving area 41 and the assembly area 42 is not individually constructed over five rows, but one row is constructed on the assembly mobile pedestal 35. The assembly moving pedestal 35 moves on the moving rail 36 constructed at the bottom of the jacked pedestal 30 in the vertical direction of the paper surface of FIG. 7. That is, when the assembly of the two towers 110 is completed in the first row and they are moved to the storage area 43, the moving pedestal 35 for assembly moves to the second row (downward on the paper) and the tower 110. The process of assembling and moving to the storage area 43 is repeated to move to the fifth row.

The number of rows of the storage area 43 and the number of towers 110 stored in the storage space of each row may be increased or decreased depending on the environment or the like. Further, since the tower 110 stored in the storage area 43 is supported by the guide slider 34 described later and the horizontal support device 60 described later when stored, the tower 110 is prevented from tipping over.

By the way, since the installation work of the wind turbine 100 at sea is short compared to the assembly of the tower 110, it is very important to assemble and store many towers 110 in advance. According to the tower assembly method and the jacked pedestal 30 of the present embodiment, a plurality of towers 110 can be continuously assembled. In addition, by allowing the moving stand 35 for assembly to move on the rail 55 and increasing the number of rows of the storage area 43 and the towers 110 stored in the storage space of each row, many towers 110 assembled can be assembled. Can be stored.

Next, the guide slider 34 will be described with reference to FIGS. 8A, 8B, and 8C. The guide slider 34 includes a square frame 51 that surrounds the tower member 111 or the side surface of the tower 110, and four pressing devices 52 that are attached to the four sides of the frame 51, respectively. The four pressing devices 52 press and support the side surfaces of the tower member 111 or the tower 110 from four directions to prevent the tower member 111 or the tower 110 from rolling or tipping over. Further, the guide slider 34 moves horizontally on the middle beam 30A (see FIG. 3) of the gantry 30 with jacks in synchronization with the carriage 33. Specifically, a rail 55 is laid on the middle beam 30A of the pedestal 30 with a jack, and the guide slider 34 moves the rail 55. The guide slider 34 can move in the range from the receiving area 41 to the storage area 43.

The pressing device 52 has a support roller 52a and a cylinder 52b, and is attached to a frame 51 made of H-shaped steel. The support roller 52a presses the side surface of the tower member 111 or the tower 110 by the force of the cylinder 52b. The tower member 111 moves up and down, such as being lifted in a lifting process described later or being mounted on another tower member 111 in a mounting process described later. In either case, the support roller 52a is the height of the tower member 111. It rotates along the direction and supports the tower member 111. Further, at the lower part of the frame 51 corresponding to the two sides along the rail 55, a roller 54 for moving the guide slider 34 on the rail 55 and a horizontal force receiving roller 53 for receiving a horizontal force are provided. It is provided. The force in the traveling direction can be received and supported by the towing jack (not shown) of the guide slider 34 and the bogie 33.

A towing hook 57 and a towing tool 56 connected to a towing jack (not shown) via a strand 58 are attached to the four corners of the frame 51, respectively, and the guide slider 34 is a towing jack (not shown). ) Tow and move horizontally. At this time, the towing jacks that pull each of the guide slider 34 and the carriage 33 are electronically controlled to tow, so that the guide slider 34 and the carriage 33 move in synchronization. As a result, the tower member 111 or the tower 110 can be moved horizontally in an independent state.

Next, the horizontal support device 60 will be described with reference to FIGS. 9A and 9B. The horizontal support device 60 is provided on the upper beam 30B (see FIG. 3) of the jacked pedestal 30 in the assembly area 42 and the storage area 43, and supports the lifted tower member 111 and the side surface of the assembled tower 110. And prevent sideways and falls.

As shown in FIG. 9A, the horizontal support device 60 is composed of a square frame in a plan view, and four guide rollers 61 for supporting the side surface of the tower member 111 are attached to the inside of the frame. The tower member 111 is lifted in the lifting process described later, mounted on another tower member 111 in the mounting process described later, or moved up and down. In either case, the guide roller 61 is the height of the tower member 111. It rotates along the direction and supports the tower member 111. Further, the wall surface of the frame body located in the direction in which the tower 110 or the tower member 111 moves (the lateral direction of the paper surface in FIG. 9) is composed of the door members 63A and 63B, and when the tower 110 moves, The movement is not hindered by opening and closing (FIG. 9 (A) shows a closed state and FIG. 9 (B) shows an open state) like a double door. In addition, the same thing as the frame body of the horizontal support device 60 may be provided in the guide slider 34 to improve the fall prevention function.

As shown in FIG. 10, it is preferable to construct the pedestal 10 and a part of the jacked pedestal 30 so as to project (extend) from the land side to the sea side. At this time, the strength may be increased by providing the underwater support column 37 at the lower part of the portion protruding toward the sea side. As a result, the tower 110 stored in the storage area 43 can be easily carried out to the SEP ship 70. That is, by extending the pedestal 30 with jacks to the sea side, the working radius of the crane 71 of the SEP ship 70 can be reduced, and the crane 71 can be operated even by a small-scale crane. In particular, since the offshore wind turbine 100 is expected to increase in equipment weight as the power generation capacity increases, it is a great cost advantage that a small-scale crane can be used. Further, in the case of the SEP ship 70, since the hull is jacked up during the work by the crane 71, it is necessary to berth at a strong part of the seabed ground (that is, offshore), but a part of the pedestal 10 and the pedestal 30 with a jack. By projecting (extending) from the land side to the sea side, it is possible to load the tower 110 offshore and load it on a small SEP ship 70.

Further, in a port where an apron portion (not shown) is formed at the end on the land side, a load is applied to the apron portion by constructing a pedestal 30 with a jack so as not to contact the apron portion above the apron portion. The tower 110 can be loaded without hanging.

In FIG. 10, the tower 110 to which the nacelle 120 and the blade 130 are not attached is loaded on the SEP ship 70, but the tower 110 to which the nacelle 120 and the blade 130 are attached is loaded on the SEP ship 70, which will be described later. You may do it.

Further, as shown in FIG. 11, the offshore wind turbine 100 is formed by attaching the nacelle 120 and the blade 130 to the tower 110 on the pedestal 30 with a jack, and the offshore wind turbine 100 is installed on the floating structure 72 to form a floating offshore wind turbine. You may assemble 100. The floating structure 72 serves as a floating foundation for the floating offshore wind turbine 100.

Specifically, the wind turbine assembly area 44 is provided at the tip of the storage area 43, and the installation area 45 is provided at the tip of the wind turbine assembly area 44, which protrudes toward the sea. The bottom of the pedestal 10 and the jacked pedestal 30 corresponding to the installation area 45 is missing, so that the floating structure 72 can enter the installation area 45 from the sea side. Further, in this case, the carriage 33 and the guide slider 34 enable the movement from the load receiving area 41 to the installation area 45.

When attaching the nacelle 120 and the blade 130 on the pedestal 30 with jacks, the nacelle 120 is attached in the assembly area 42, and the blade 130 is attached in the wind turbine assembly area 44. Specifically, first, when the uppermost tower member 111 is arranged in the assembly area 42, the nacelle 120 is attached on the uppermost tower member 111 by using a jack 31. After that, the tower member 111 is assembled, and the tower 110 to which the nacelle 120 is attached is moved from the assembly area 42 to the storage area 43 together with the trolley 33 and the guide slider 34 for storage. Next, the tower 110 is moved from the storage area 43 to the wind turbine assembly area 44 together with the dolly 33 and the guide slider 34, and the blade 130 is attached to the nacelle 120 in the wind turbine assembly area 44. In this way, the offshore wind turbine 100 is assembled. Next, the floating structure 72 is moved to the sea corresponding to the installation area 45, and the offshore wind turbine 100 is equipped with a traveling jack 38 (for example, a traveling heavy object elevating device disclosed in Japanese Patent Application Laid-Open No. 2017-0008695). It can be moved from the storage area 43 to the installation area 45 while being lifted by. At this time, by moving the dolly 33 and the guide slider 34 together, it is possible to prevent the vehicle from tipping over during movement. After moving the offshore wind turbine 100 to the installation area 45, the traveling jack 38 lowers the lifted offshore wind turbine 100 downward and mounts it on the floating structure 72. As a result, the floating offshore wind turbine 100 can be assembled at the port without using a super-large crane vessel or a SEP vessel. The assembled offshore wind turbine 100 is towed to a predetermined position where it is installed and moored to complete the installation.

By the way, when the tower 110 or the offshore wind turbine 100 is about to tip over, a large tipping moment acts on the gantry 30 with jacks. Since the bottom of the pedestal 10 has a large load, the center of gravity of the jacked pedestal 30 can be lowered, but the load alone may not be sufficient to prevent the tower 110 or the offshore wind turbine 100 from tipping over. However, since the crawler crane 20 is arranged at the end of the pedestal 30 with jacks, it plays a sufficient role as a counterweight when the tower 110 or the offshore wind turbine 100 falls. For this reason, the pedestal 10 has a beam structure having sufficient strength against the overturning of the pedestal 30 with jacks.

Next, each step of the tower assembly method of the offshore wind turbine 100 will be described.

[1. Carry-in process]
First, the carry-in process will be described. The carry-in step is a step of carrying the tower member 111 transported by the transport vehicle into the trolley 33 arranged in the load receiving area 41 in the jacked gantry 30 by the crawler crane 20 arranged on the pedestal 10. The carriage 33 is towed by a strand connected to a jack (not shown) from the receiving area 41 to the storage area 43 (when assembling the floating offshore wind turbine 100, from the receiving area 41 to the installation area 45 (see FIG. 11)). You can move within the range of. Flange is formed on four sides of the upper surface of the trolley 33 to prevent the tower member 111 from tipping over.

When the tower member 111 is carried into the jacked mount 30, the carriage 33 and the guide slider 34 move synchronously, and the tower member 111 is moved to the assembly area 42. The movement of the tower member 111 from the load receiving area 41 to the assembly area 42 also serves as an arrangement process described later. When the tower member 111 is moved to the assembly area 42, another carriage 33 is arranged in the load receiving area 41, and the tower member 111 to be carried in next is received.

[2. Assembly process]
The assembly process will be described with reference to FIGS. 3 and 4. The assembling step is a step of assembling a plurality of tower members 111 in the assembling area 42. In the assembling process, the tower members 111 in the second and subsequent stages from the top are sequentially added under the tower member 111A in the uppermost stage to assemble the tower member 111. The assembly process includes a lifting process of 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.

[2.1. Lifting process]
The lifting step is a step of lifting the tower member 111 or the assembled tower member 111 in the assembly area 42. When the uppermost tower member 111A is moved to the assembly area 42, the tower member 111A (see FIG. 3) is lifted. At this time, the tower member 111B to be carried in next is lifted to a height that can be arranged in a standing posture under the lowermost end of the lifted tower member 111A. On the other hand, when the tower members 111 of the second and subsequent stages from the top are carried into the cargo receiving area 41, the assembled tower members 111 assembled up to that point (in the case of FIG. 4, the tower members 111A and the tower members 111B). To wait for the tower member 111 of the receiving area 41 to be placed in the assembly area 42. In the lifting process, the tower member 111 or the assembled tower member 111 is supported by the guide slider 34 and the horizontal support device 60 when it is lifted, so that lateral vibration and tipping do not occur. ..

[2.2. Placement process]
When the tower member 111 or the assembled tower member 111 is lifted by the jack 31, the carriage 33 and the guide slider 34 move in synchronization with each other, and the tower member 111 carried into the cargo receiving area 41 moves under the lifted tower member 111. Is placed in.

[2.3. Placement process]
Next, the jack 31 places the tower member 111 lifted in the lifting step on the tower member 111 arranged in the assembly area 42.

[2.4. Joining process]
Next, the tower members 111 are joined to each other by joining the flange joints (not shown) formed in each of the tower member 111 arranged in the assembly area 42 and the tower member 111 mounted in the mounting process. ..

The tower 110 is completed by repeating the lifting process, the arranging process, the mounting process, and the joining process to join the tower member 111A, the tower member 111B, and the tower member 111C (see FIG. 5).

[3. Moving process]
The moving step is a step of moving the tower 110 together with the trolley 33 from the assembly area 42 to the storage area 43 when the assembly of the tower 110 is completed in the assembly area 42. Specifically, the trolley 33 and the guide slider 34 move synchronously to move the tower 110 on the trolley 33 from the assembly area 42 to the storage area 43 (see FIG. 6).

[4. Loading process]
The loading process is a process of loading the completed tower 110 from the storage area 43 onto an SEP ship (an example of a “transport ship”) (see FIG. 10).

[5. Installation process]
In the mounting process, when assembling the floating offshore wind turbine 100 described above, the nacelle 120 is attached to the uppermost tower member 111A in the assembly area 42, and further, the blade 130 is attached to the nacelle 120 in the wind turbine assembly area 44. It is a step of attaching (see FIG. 11).

[6. Installation process]
The installation process is a process of moving the tower 110 to which the nacelle 120 and the blade 130 are attached from the storage area 43 to the installation area 45 in the installation process, and installing the completed tower 110 on the floating structure 72 (see FIG. 11). ..

As described above, the tower assembly method of the offshore wind turbine 100 of the present embodiment is a tower assembly method of assembling a plurality of tower members 111 formed by dividing the tower of the offshore wind turbine 100 in the height direction on land. This includes an assembly step of assembling a plurality of tower members 111 on a jacked pedestal 30 constructed on the pedestal 10 based on the pedestal 10 installed on the ground.

Therefore, according to the tower assembly method of the offshore wind turbine 100 of the present embodiment, a plurality of tower members 111 are assembled on a jacked pedestal 30 constructed on the pedestal 10 based on the pedestal 10 installed on the ground. Therefore, the tower 110 of the offshore wind turbine 100 can be assembled on land where the ground is soft, such as a port where ground improvement work and foundation piles cannot be driven. Further, after the assembly of all the towers is completed, the current state can be easily restored by removing the pedestal 30 with jacks and the pedestal 10.

Further, in the assembly process, in the assembly area 42 in the pedestal 30 with jacks, the tower members 111 of the second and subsequent stages from the top are sequentially added and assembled under the tower member 111A of the uppermost stage. Specifically, the assembly process includes a lifting process of 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 tower assembly method of the offshore wind turbine 100 of the present embodiment of the present embodiment, the tower members 111 can be sequentially added from the bottom by the jack 31 that lifts the tower members 111 assembled up to that point. On the other hand, when the tower members 111A and 111B of the second and subsequent stages from the bottom are sequentially stacked on the lowermost tower member 111C as in the conventional case, a large arm having an arm extending to the uppermost part of the tower 110 is provided. Requires a scale crane. 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.

By the way, although Europe has a track record of offshore wind power generation, the weather conditions are different, so it is necessary to consider the effects of typhoons and strong winds when assembling the tower according to the climate of Japan. In the jack construction method in which the tower member 111 is lifted by the jack 31 as in the present embodiment, unlike the crane construction method in which the tower member 111 is stacked by a crane, the tower member 111 can be lifted at multiple points, so that the behavior of the tower member 111 when lifted is different. Very stable and less susceptible to wind. In addition, Japan has a higher risk of earthquakes than Europe, but since the tower member 111 is suspended at the time of an earthquake, it is less susceptible to seismic waves and the risk of falling is low.

Further, in the tower assembly method of the offshore wind turbine 100 of the present embodiment, the tower member 111 is arranged in the load receiving area 41 in the jacked pedestal 30 by the crawler crane 20 (an example of “crane”) arranged on the pedestal 10. It includes a carry-in process of carrying into the trolley 33. That is, the crawler crane 20 can carry the tower member 111 transported to the port into the jacked pedestal 30, and can play a sufficient role as a counterweight when the tower 110 or the offshore wind turbine 100 falls.

Further, in the tower assembly method of the offshore wind turbine 100 of the present embodiment, when the assembly of the tower 110 is completed in the assembly area 42, the tower member together with the carriage 33 is transferred from the assembly area 42 to the storage area 43 in the jacked mount 30. Includes a moving step to move the. That is, as a series of steps, the tower member 111 can be carried in, assembled, and the assembled tower 110 can be stored.

Furthermore, the tower assembly method of the offshore wind turbine 100 of the present embodiment includes an attachment step of attaching the nacelle 120 and the blade 130 to the uppermost tower member 111A. As a result, the offshore wind turbine 100 can be assembled on land.

Furthermore, the tower assembly method of the offshore wind turbine 100 of the present embodiment includes a loading step of loading the tower 110 from the storage area 43 onto the SEP ship 70 (an example of a “transport ship”). As a result, the tower 110 assembled on land can be transported to the installation position of the offshore wind turbine 100.

Furthermore, the tower assembly method of the offshore wind turbine 100 of the present embodiment includes an installation step of installing the tower 110 from the storage area 43 on the floating structure 72 which is the floating body base of the offshore wind turbine 100. As a result, the offshore wind turbine 100 having a floating structure can be assembled along the coast such as a port.

Furthermore, the carriage 33 used in the tower assembly method of the offshore wind turbine 100 of the present embodiment is formed with a flange for supporting the tower member 111 or the tower 110. As a result, it is possible to prevent the tower member 111 or the tower 110 on the carriage 33 from tipping over.

Furthermore, the tower member 111 or tower 110 on the carriage 33 in the tower assembly method of the offshore wind turbine 100 of the present embodiment is a guide slider 34 (an example of "support means") and a horizontal support device 60 (an example of "support means"). ). Therefore, the lateral vibration of the tower member 111 can be suppressed when the tower member 111 is lifted, and the tower 110 can be prevented from tipping over when stored. The tower member 111 or the tower 110 may be supported by either the guide slider 34 or the horizontal support device 60.

Furthermore, the guide slider 34 in the tower assembly method of the offshore wind turbine 100 of the present embodiment moves horizontally while supporting the tower member 111 or the tower 110 as the tower member 111 or the tower 110 moves. As a result, it is possible to prevent lateral vibration and overturning when the tower member 111 or the tower 110 is moved.

Furthermore, the pedestal 10 used in the tower assembly method of the offshore wind turbine 100 of the present embodiment has a plan view grid shape, and mat-type air jacks are installed in each gap 11 of the grid. As a result, the load can be uniformly distributed over the entire inside of the gap 11 of the lattice.

Furthermore, the tower assembly method of the offshore wind turbine 100 of the present embodiment includes a control step of monitoring the pressure of each mat type air jack and controlling the pressure of the mat type air jack whose pressure has decreased to be increased. As a result, even when the ground subsides, the subsidence of the pedestal 10 can be suppressed.

Furthermore, the crawler crane 20 is arranged on the pedestal 10 used in the tower assembly method of the offshore wind turbine 100 of the present embodiment. As a result, the pedestal 10 is pressed against the ground by the weight of the heavy crawler crane 20, the stability of the jacked pedestal 30 on the pedestal 10 is improved, and the tower 110 supported by the jacked pedestal 30 is prevented from tipping over. be able to.

Furthermore, the tower member 111 is carried into the jacked pedestal 30 used in the tower assembly method of assembling a plurality of tower members 111 formed by dividing the tower 110 of the offshore wind turbine 100 of the present embodiment in the height direction on land. Assembling the tower 110 in the assembly area 42 and the assembly area 42 in which the tower members 111B and 111C in the second and subsequent stages from the top are sequentially added under the load receiving area 41 and the tower member 111A in the uppermost stage to assemble the tower 110. When the above is completed, it has a storage area 43 for storing the tower 110, and is constructed on the pedestal 10 based on the pedestal 10 installed on the ground.

Therefore, according to the jacked mount 30 of the present embodiment, the tower 110 of the offshore wind turbine 100 can be assembled and stored on land where the ground is soft, such as a port where ground improvement work and foundation piles cannot be driven. Further, after the assembly of all the towers is completed, the current state can be easily restored by removing the jack pedestal 30 and the pedestal 10.

10 Pedestal 11 Gap 20 Crawler crane 30 Jacked pedestal 30A Middle beam 30B Upper beam 31 Jack 32 Strand 33 Trolley 34 Guide slider 35 Assembling mobile pedestal 36 Moving rail 37 Underwater prop 38 Jack 41 Loading area 42 Tower assembly area 43 Storage Area 44 Crane assembly area 45 Installation area 51 Frame 52 Pressing device 52a Support roller 52b Cylinder 53 Horizontal force receiving roller 54 Roller 55 Rail 56 Crane 57 Tow hook 58 Strand 60 Horizontal support device 61 Guide roller 62 Support material 63A, 63B Door member 70 SEP ship 71 Crane 72 Floating structure 100 Offshore windmill 110 Tower 111 Tower member 120 Nacelle 130 Blade

Claims (6)

It is a tower assembly method that assembles multiple tower members made by dividing the tower of an offshore wind turbine in the height direction on land.
An assembly process of assembling the plurality of tower members on a pedestal with jacks built on the pedestal based on a pedestal installed on the ground.
Including
A tower assembly method characterized in that the pedestal has a plan-view grid shape and mat-type air jacks are installed in each gap of the grid . The tower assembly method according to claim 1.
A tower assembly method comprising a control step of monitoring the pressure of each of the mat-type air jacks and controlling the pressure of the mat-type air jacks whose pressure has decreased to increase the pressure . The tower assembly method according to claim 1 or 2.
A tower assembly method, wherein a part of the pedestal and the jacked pedestal is constructed so as to project from the land side to the sea side . The tower assembly method according to claim 3.
The bottom of the pedestal and the jacked pedestal protruding from the land side to the sea side is missing, and the floating structure that forms the floating body base of the offshore wind turbine can enter the part from the sea side. A tower assembly method characterized by being The tower assembly method according to any one of claims 1 to 4.
The tower member or the tower is supported by supporting means and
A tower assembling method , wherein the support means moves horizontally while supporting the tower member or the tower as the tower member or the tower moves . It is a pedestal with a jack used in the tower assembly method of assembling multiple tower members formed by dividing the tower of an offshore wind turbine in the height direction on land.
An assembly area for assembling the tower by sequentially adding the tower members in the second and subsequent stages from the top under the tower member in the uppermost stage.
A jack that lifts the tower member in the assembly area,
Have,
Built on the pedestal based on the pedestal installed on the ground,
The jack is provided at a position lower than the height of the tower.
The pedestal has a plan-view grid shape, and a pedestal with a jack is characterized in that a mat-type air jack is installed in each gap of the grid.

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