KR102361209B1 - Offshore wind power generator having segmented structure, apparatus having the same, and Method for installing the generator - Google Patents

Abstract

An offshore wind generator having a split structure that can be installed in excess of the allowable height of the center of gravity of the MMB (Multi-purpose Mobile Base) is disclosed. The offshore wind generator may include an upper structure and a lower structure connected to the upper structure in a divided structure and supporting the upper structure. The center of gravity can be lowered when transporting offshore wind power generators using MMB (Multi-purpose Mobile Base).

Description

An offshore wind power generator having a segmented structure, an offshore wind power generator including the same, and an installation method thereof

The present invention relates to an offshore wind power generator, and more particularly, to an offshore wind generator having a split structure capable of simultaneous transport and installation using a batch transport installation vessel, and an offshore wind power generator including the same.

A horizontal axis offshore wind generator (hereinafter, referred to as an offshore wind generator) is formed of an upper turbine structure and a lower structure. In general, the upper turbine structure consists of a rotor-blade, a nacelle, and a tubular tower, and the lower structure consists of a support structure and a foundation.

This offshore wind power generator installation method has applied a method of sequentially assembling each component constituting the upper turbine structure and the lower structure by individually transporting them, and then sequentially assembling them using offshore heavy equipment such as jack-up pants or offshore cranes. However, this installation method has disadvantages in that sea work time is long and high cost is invested in using heavy equipment. In particular, there is a problem that there is a high probability that the operation is delayed depending on the marine environment, so that the risk of operation risk and/or additional cost is included.

In order to overcome this, a ship for bulk transport and installation of offshore wind power generators has been proposed. For this, Korea Patent No. 10-2092198 (registration date: March 17, 2020) can be mentioned. In this case, the upper turbine structure and the lower structure are integrally assembled at the port prior to shipping by sea. In addition, for a ship for batch transport and installation (hereinafter referred to as MMB, Multi-purpose Mobile Base), sea transport and offshore installation are simultaneously performed for an integrated offshore wind power generator.

When performing offshore installation work using these MMBs, only the construction method that enables rapid installation of the substructure can be applied. The post-piling method, which is the most commonly used in Korea, takes more than one month to complete installation, so it is not suitable for MMB application.

In particular, in the case of this technology, the offshore wind power generator is transported in an upright state. At this time, the offshore wind generator is bound to the support frame of the MMB through a clamp and a wire. The upright transport method has the advantage of being able to reduce the MMB deck area compared to when the offshore wind generator is transported in a horizontal state, and to minimize the additional work of erecting the offshore wind generator.

However, since the offshore wind power generator is elongated and has a high center of gravity, it is necessary to closely examine the stability when transporting upright. In addition, the offshore wind generator has a height of more than 100 m (from the lower part of the substructure to the center of the nacelle), and in particular, the upper turbine structure has a characteristic that most of the weight is concentrated at the height of the nacelle.

More specifically, the MMB has a limit on the size (or capacity) of the generator that can be mounted due to the height limit of the height of the center of gravity of the offshore wind generator and the support frame. At this time, there is inevitably a limit to the height that can be arranged in the support frame in order to secure the stability of the MMB (restorability, structural strength, etc.).

On the other hand, since the offshore wind generator cannot make a point binding to the support frame at a point exceeding the top of the support frame, the center of gravity must be lower than the top of the support frame to ensure work stability. However, the generator has a high center of gravity, and it is easy to exceed the height of the support frame above a certain capacity, so special attention is required.

That is, when the offshore wind power generator is enlarged and the center of gravity rises, the work range of the MMB is exceeded, and a problem arises that it cannot be mounted. So far, only 3MW class offshore wind power generators have been installed in Korea. However, the development of medium-to-large generators of 5 to 6 MW has been completed, and the installation of offshore wind farms is in progress. Therefore, in order to continuously utilize the MMB in the future, it is necessary to secure a method to stably mount a mid- to large-sized offshore wind power generator.

1. Korea Patent No. 10-2092198 (Registration Date: March 17, 2020)

The present invention has been proposed to solve the problems according to the above background art, and an offshore wind power generator having a split structure that can be installed in excess of the allowable height of the center of gravity of a multi-purpose mobile base (MMB) and offshore wind power including the same An object of the present invention is to provide a power generation device.

Another object of the present invention is to provide an offshore wind power generator having a split structure capable of stably mounting a medium or large offshore wind generator in order to continuously utilize the MMB in the future, and an offshore wind power generator including the same.

The present invention provides an offshore wind power generator having a divided structure that can be installed in excess of the allowable height of the center of gravity of the MMB (Multi-purpose Mobile Base) in order to achieve the object presented above.

The offshore wind power generator,

superstructure; and

It may be connected to the upper structure in a divided structure, and a lower structure supporting the upper structure after completion of offshore installation; characterized in that it includes.

At this time, the upper structure, the rotor-blade; a nacelle connected to the rotor-blade and generating electricity according to rotation; and a tower having an upper end connected to the nacelle, and a lower end coupled to the lower structure.

In this case, the lower structure may include a support structure connected to the upper structure to support the upper structure; and a base part supporting the support structure part.

In addition, the support structure may include: a connecting element portion in which a hollow is formed into which the tower is inserted; a deck platform integrally formed on an outer circumferential surface of the connecting element portion; a plinth formed integrally with the end of the deck platform, and supporting the deck platform; and a base part connected to the hem of the plinth.

In addition, the lower structure, the inclined member for strengthening the strength of the plinth; characterized in that it further comprises.

In addition, it is characterized in that the binding portion is installed in the same pair on the upper surface of the deck platform and the outer peripheral surface of the lower end of the tower.

In addition, the binding portion is characterized in that any one of a pad eye (Pad-eye), a jig (jig), and a winch (Winch).

In addition, the lower structure is characterized in that it secures additional weight through the ballast.

On the other hand, another embodiment of the present invention, the above-described offshore wind power generator; and a transport vessel on which the offshore wind power generator is mounted; including, a hull; a sliding deck supporting the end of the offshore wind generator and sliding the surface of the hull in a horizontal direction; and a support frame mounted on the surface of the hull and supporting the offshore wind power generator.

In addition, the support frame, a plurality of wires for the lowering (lowering) or lifting (lifting) of the offshore wind power generator; characterized in that it comprises a.

In addition, it is characterized in that the wire stoppers for binding or fixing the plurality of wires installed on the opposite surface of the upper surface of the support frame are respectively installed.

(여기서, H_sub : 하부 구조물의 높이(= d + H_f + H_offset), d : 설치지점 수심, H_f : 기초부의 높이, H_offset : 연결 요소부의 상단 혹은 데크 플랫폼의 해수면 이격거리, Hsd : 선체의 만재흘수선 기준 슬라이딩 데크 상단의 높이이다)으로 정의되는 것을 특징으로 한다.In addition, the height (H) from the top of the sliding deck to the bottom of the tower is

(here, H _sub : height of the lower structure (= d + H _f + H _offset ), d: water depth at the installation point, H _f : height of the foundation, H _offset : separation distance from sea level of the upper end of the connecting element or deck platform, Hsd : It is characterized by being defined as the height of the top of the sliding deck based on the load line of the hull).

In addition, it is characterized in that the mounting structure is disposed on the surface of the sliding deck for the purpose of securing the vertical position of the upper structure.

On the other hand, another embodiment of the present invention is, (a) using a land crane on a transport vessel moored to the quay of a port to sequentially assemble and mount an offshore wind power generator, which is a split structure, of an upper structure and a lower structure. step; (b) a wire binding step of fastening both ends of the wire to a binding part positioned in pairs on the upper structure and the lower structure; (c) an offshore transport step in which the offshore wind power generator is mounted on the transport vessel and transported by sea; (d) unloading the lower structure using the wire at the installation point of the offshore wind power generator, and the upper structure is lifted; (e) a coupling step of coupling the upper structure and the lower structure after the base of the lower structure is mounted on the top of the seabed; and (f) when the base part penetrates the seabed ground, the completion step of disconnecting the wire from the offshore wind power generator; provides an offshore wind generator installation method comprising a.

In addition, the coupling of the upper structure and the lower structure is characterized in that made using a flange coupling method or a grout injection method.

In addition, the offshore wind generator installation method includes a wire stopper binding step of binding or fixing the wire using a wire stopper so that the wire does not lose its balance even in an external disturbance between steps (b) and (f). It is characterized in that it contains;

According to the present invention, it is possible to lower the center of gravity when transporting offshore wind power generators using MMB (Multi-purpose Mobile Base).

In addition, as another effect of the present invention, it is possible to improve floating stability during sea transport and minimize the risk of overturning of the MMB. That is, when reviewed based on the weight and substructure specifications of the offshore wind generator to be described later, the center of gravity of the offshore wind generator can be lowered to about 20m.

In addition, as another effect of the present invention, the workability is excellent, the split structure bundling operation is relatively simple, and the height of the offshore wind generator is lowered compared to the conventional one during port assembly and/or sea transport operation, thereby reducing work at high altitude. points can be taken. In other words, since the split structure binding operation basically uses the balanced/unbalanced state of the wire, additional power and additional work can be minimized.

In addition, as another effect of the present invention, it is possible to apply the previously manufactured MMB to a large offshore wind power generator to be introduced in the future, and it is possible to reduce the facility investment cost according to the new MMB production.

In addition, as another effect of the present invention, it is possible to improve the usability by presenting the MMB work plan for various offshore wind power generator specifications, and to secure a basis for continuously using the MMB in the future.

1 is a conceptual diagram illustrating the transfer of an offshore wind power generator having a divided structure according to an embodiment of the present invention.
2 is a conceptual diagram at the time of on-site installation of an offshore wind power generator having a divided structure according to an embodiment of the present invention.
3 is a block diagram of the offshore wind power generator shown in FIGS. 1 to 2 .
4 is a configuration diagram of the transport vessel shown in FIGS. 1 to 2 .
5 is a conceptual diagram illustrating a process of assembling the offshore wind power generator shown in FIGS. 3 to 4 on the quay wall of a port.
6 is a conceptual diagram illustrating a process of assembling the offshore wind power generator shown in FIGS. 3 to 4 on a quay wall of a port.
7 is a conceptual diagram illustrating a process of binding the split structure of the offshore wind power generator and the transport vessel shown in FIGS. 3 to 4 with a wire.
8 is a conceptual diagram illustrating a process of removing the wire stopper binding and mounting structure after the wire binding shown in FIG. 7 .
9 is a view showing a process of transferring the offshore wind power generator shown in FIG. 8 to the field.
10 is a view showing a process of moving the sliding deck in the offshore wind power generator shown in FIG.
FIG. 11 is a view showing a concept of combining a divided structure in the offshore wind power generator shown in FIG. 8 .
FIG. 12 is a view showing the process of foundation penetration, wire binding release, and installation completion in the offshore wind power generator shown in FIG. 8 .

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each figure, like reference numerals are used for like elements. Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. shouldn't

Hereinafter, an offshore wind power generator having a divided structure and an offshore wind power generator including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of an offshore wind power generator 100 having a divided structure during transport according to an embodiment of the present invention. Referring to FIG. 1 , the offshore wind power generator 100 may include an offshore wind generator 110 and a transport vessel 120 on which the offshore wind generator 110 is mounted. The offshore wind power generator 110 has a divided structure.

The offshore wind generator 110 is assembled on the upper end of the transport vessel 120 , and is transported through the transport vessel 120 . Of course, after transport, the transport vessel 120 is anchored in the seabed ground 10 of the underwater 20 .

2 is a conceptual diagram at the time of on-site installation of the offshore wind power generator 100 having a divided structure according to an embodiment of the present invention. Referring to FIG. 2 , after being transported to the installation site through the transport vessel 120 , the transport vessel 120 is fixed to the seabed ground 10 of the underwater 20 .

3 is a block diagram of the offshore wind power generator 110 shown in FIGS. 1 to 2 . Referring to FIG. 3 , the offshore wind power generator 110 has a divided structure, and the divided structure includes an upper structure 310 and a lower structure 320 .

The upper structure 310 may include a rotor-blade 311 , a nacelle 312 , a tower 313 , and the like. The rotor-blade 311 is connected to the nacelle 312 and rotates by receiving aerodynamic power from the wind. The nacelle 312 is located at the upper end of the tower 313a, and is a housing provided with a generator, a drive train, and the like.

The tower 313 is a multi-stage structure connecting the lower structure 320 and the nacelle 312 . To this end, the tower 313 is composed of a tower upper end 313a, a tower lower end 313b, a binding portion 321-1, and the like. The tower 313 is a cylindrical tower (tubular tower), but is not limited thereto, and a cross-section or truss structure such as a square, hexagon, or octagon is also possible.

As a material of the rotor-blade 311 , the nacelle 312 , and the tower 313 , stainless steel, steel, or the like may be used. Of course, the surface may be coated with a corrosion inhibitor to prevent corrosion by salt.

The lower structure 310 is connected to the upper structure 310 and serves to support the upper structure 310 . To this end, the lower structure 310 includes a supporting structure 321 and a base 322 supporting the supporting structure 321 . The support structure 321 is submerged in the water 20 and is a structure connecting the tower 313 at the top and the base 322 at the bottom.

The support structure 321 includes a hollow formed connection element (transition piece) portion (321-3), a deck platform (321-2) integrally formed on the outer circumferential surface of the connection element portion (321-3), the deck platform ( Formed integrally with the end of 321-2), the plinth 321-5 supporting the deck platform 321-2, the inclined member 321-4 for strengthening the strength of the plinth 321-5 , may be configured to include a base portion 322 connected to the hem of the plinth 321-5, and the like. In other words, the tower 313 is inserted into the hollow of the connecting element part. A binding portion 321-1 may be configured at the upper end of the deck platform 321-2.

The binding portion 321-1 is configured in the same pair on the upper surface of the deck platform 321-2 of the lower structure 320 and the outer peripheral surface of the tower lower end 313b, respectively, the upper support frame of the transport vessel 120 and It is the part where both ends of the connected wire are bound. The binding part 321-1 may be formed in one of the forms of a pad-eye, a jig, and a winch.

The deck platform 321-2 is formed in the form of a deck (deck) formed in the outer direction of the upper end of the connecting element part 321-3, and performs the binding operation of the tower lower end 313b and the connecting element part 321-3. It is a platform that In addition, it is formed at a height similar to the tower entrance door provided at the lower end of the tower 313b or is connected by stairs so that the working personnel can smoothly enter the tower 313 from the lower structure 310 .

The connection element part 321-3 is located at the upper end of the lower structure 310 and is directly connected to the lower end of the tower 313 . In particular, the tower lower end 313b is inserted into the hollow formed inside the connecting element portion 321-3. In one embodiment of the present invention, so that the lower end of the tower 313b can pass through, it is formed in a cylindrical structure having an inner diameter greater than the maximum outer diameter of the tower 313 (typically, the outer diameter of the lower end 313b of the tower) and an appropriate height of 1 m or more. do.

The inclined member 321-4 is a member for connecting different members with an inclination for the purpose of reinforcing the structure of the plinth 321-5. The inclined member 321-4 connects between the plinth members 321-5 or between the plinth members 321-5 and the connecting element part 321-3.

The plinth 321 - 5 is a leg-shaped member located outside the support structure 321 , and directly connects the base 322 and the connecting element portions 321-3 of the support structure.

The base 322 is connected to the distal end of the plinth 321 - 5 to support the plinth 321 - 5 , and is inserted into the seabed ground 10 to fix the offshore wind power generator 110 . To this end, the base 322 is connected to each end of each plinth 321 - 5 . In other words, the first base portion 322-1 is connected to the end of the first plinth, and the second base portion 322-2 is connected to the end of the second plinth. In addition, the base part 322 is a part that is fixed to the seabed ground 10 and supports the load generated from the upper part.

4 is a configuration diagram of the transport vessel 120 shown in FIGS. 1 to 2 . 4, the transport vessel 120, the hull 410, supporting the end of the offshore wind power generator 110, sliding deck 420 sliding the surface of the hull 410 in the horizontal direction, the hull ( It is mounted on the surface of the 410) and may be configured to include a support frame 430 for supporting the offshore wind power generator 110, and the like.

The hull 410 is a multi-purpose mobile base (MMB) for bulk transport and installation, and it is possible to simultaneously transport and install the offshore wind power generator 110 integrally at sea.

Since the sliding deck 420 is movable in the horizontal direction of the hull 410, it enables opening and closing of an opening (not shown) for lowering or lifting formed at the rear of the hull 410 . That is, the sliding deck 420 moves toward the stern when transporting the offshore wind generator 110 to close the opening (not shown) for unloading or lifting. In this case, the sliding deck 420 is positioned under the support frame 430 and serves to stably seat the offshore wind power generator 110 .

On the other hand, when the hull 410 is stopped and the offshore wind generator 110 is installed, it moves horizontally to the rear of the support frame 430 to secure a space for lowering the offshore wind generator 110 . That is, the unloading opening is opened.

In order to move the sliding deck 420 in the horizontal direction, a wheel (not shown), a rail (not shown) on which the wheel moves, a driving motor (not shown) for rotating the wheel, etc. may be configured. .

The support frame 430 functions to support the offshore wind generator 110 to move it in a vertical direction. The support frame 430 is an A-shaped frame formed perpendicular to the upper surface of the hull 410 . In addition, one side of the support frame 430 has an open/closed structure, that is, one side of the slopes has a form that can be opened and closed. Therefore, it is possible to insert and seat the offshore wind power generator 110 through the open/closed surface.

In addition, the clamps 451 and 452 are installed on the upper surface of the support frame 430 and perform a clamping function. In particular, the clamps 451 and 452 are coupled orthogonally to each other to support the upper end of the center of gravity of the offshore wind power generator 110 . Of course, a through hole (not shown) is formed in the center of the upper surface of the support frame 430 so that the tower 313 passes therethrough. Clamps 451 and 452 are hydraulic clamps. It is not limited thereto, and a pneumatic clamp or the like is also possible.

Also, a wire 440 is configured. The wire 440 includes a first wire portion 441 connected to the binding portion (321-1 in FIG. 3) and a second wire portion 442 connected to the lower end of the tower 313b. The first wire part 441 and the second wire part 442 are denoted as two for understanding as one wire.

A wire stopper 443 is installed on the rear side of the upper surface of the support frame 430 . The wire stopper 443 is a mechanism for binding/fixing the wire. Accordingly, it is possible to prevent loss of wire balance due to external disturbance during lowering or lifting of the offshore wind power generator 110 .

The mounting structure 530 may be installed as needed. Mounting structure 530 is installed for the purpose of mounting the upper structure 310 on the top of the sliding deck 420 when the vertical position of the lower end of the upper structure 310 is higher than the lower end of the lower structure 320 during sea transport, and a jig Alternatively, it may be formed in one of the forms such as a hydraulic jack.

1 to 4, the overall operating principle of the offshore wind power generator 100 will be described.

The offshore wind generator 110 is a divided structure divided into two and is composed of an upper structure 310 and a lower structure 320 . The upper structure 310 and the lower structure 320 are mounted on the hull 420 . At this time, it should be bound and mounted so as to satisfy the following conditions.

go. weight

The split structure must have the same self-weight or the difference in self-weight must be within the allowable range according to the frictional force of the wire. As a specific embodiment, there is a method in which the lower structure 320 is manufactured with the same weight as the ready-made upper turbine structure, and then divided into two upper turbine structures and two lower structures and mounted. When applying the above embodiment, considering that the weight of the 6MW class upper turbine structure is about 750 tons, the lower structure 320 should be manufactured to be close to about 750 tons.

me. Combination

The division structure is bound to the hull 420 through a wire 440 in a state in which the tower 313 lower end and the connecting element portion 321-3 are concentrically formed. Both ends of each wire should be bound to a pair of binding portions 321-1 located in the upper structure 310 and the lower structure 320, which are divided structures, while maintaining sufficient tension.

All. Interference

In addition, when the upper structure 310 and the lower structure 320 are mounted on the transport vessel 120, spatial interference with parts of the transport vessel 120 such as the support frame 430 and clamps 451 and 452 should not occur. . At this time, the interference should be reviewed including the clearance considering the displacement and attitude change that may occur during sea transport and installation.

La. vertical position

The divided structure including the lower structure 320 is mounted to be seated on the top of the sliding deck 420 . When it is impossible to seat the sliding deck, the lower end of the base portion 322 included in the divided structure maintains the same vertical position as the upper surface of the sliding deck 420 and must be mounted on the hull 410 . On the other hand, the vertical height of the lower structure 320 including the tower 313 may be determined according to the following equation.

Here, H: the height from the top of the sliding deck 420 to the bottom of the tower 313

H _sub : the height of the lower structure 320 (= d + H _f + H _offset )

d : depth of installation point

H _f : the height of the base 322

H _offset : the upper end of the connecting element part (321-3) or the sea level separation distance of the deck platform (321-2)

Hsd: the height of the top of the sliding deck 420 based on the load waterline of the hull 410

For example, the installation point water depth d = 15m, the base height H _f = 15m, the upper sea level separation distance H _offset = 20m of the connection element part (321-3), the top of the sliding deck 420 based on the load line of the hull 410 If the height of H _sd = 4m, it is as follows.

I) Substructure height Hsub = 15m + 15m + 20m = 50m

II) The height from the top of the sliding deck 420 to the bottom of the tower 313 is H = 15m + 20m - 15m - 2ㅧ4m = 12m

In practice, the height H is expected to form mostly at the level of 10 to 20 m. When the above formula is applied, the upper end of the connecting element part 321-3 and the tower in a state in which the lower structure 320 is lowered to the upper surface of the subsea ground 10 during on-site installation of the offshore wind power generator at the offshore point There is an advantage that the lower end of (313) can be located at the same height. This facilitates the bonding operation of the upper structure 310 and the lower structure 320 .

5 is a conceptual diagram illustrating a process of assembling the offshore wind power generator 100 shown in FIGS. 3 to 4 on the harbor quay wall 510 . Before explaining FIG. 5 , first, after assembling the lower structure 320 including the supporting structure 321 , the base 322 and the like on the transport vessel 120 , the harbor quay wall using the land crane 520 . It is transferred to (510). Thereafter, a mounting structure 530 such as a jig or a hydraulic jack is disposed at an appropriate position of the sliding deck 420 for the purpose of securing the vertical position of the upper structure 310 . Of course, the mounting structure 530 is dismantled and removed after the wire binding operation is completed.

5, after the transport vessel 120 is transferred to the harbor quay wall 510 through the land crane 520, the tower 313 is assembled.

6 is a conceptual diagram illustrating a process of assembling the offshore wind power generator 100 shown in FIGS. 3 to 4 on the harbor quay wall 510 . Referring to FIG. 6 , after the tower 313 is assembled, the nacelle 312 , the blade 311 , and the like are sequentially assembled.

7 is a conceptual diagram illustrating a process of binding the divided structure of the offshore wind power generator 110 and the transport vessel 120 shown in FIGS. 3 to 4 with a wire 440 . Referring to FIG. 7 , after fastening both ends of the wire 440 to the binding part 321-1 installed at the lower end of the tower 313b and the support structure 321 , tension is applied to the wire 440 to the lower structure Lifting (320).

8 is a conceptual diagram illustrating a process of removing the wire stopper binding and mounting structure 530 after the wire binding shown in FIG. 7 . Referring to FIG. 8 , the wire 440 is bound/fixed through the wire stopper 443 . This is for the purpose of preventing the loss of balance of the wire due to external disturbance when the transport vessel 120 is transported by sea. When the wire 440 is bound/fixed, the mounting structure 530 is removed.

9 is a view showing a process of transporting the offshore wind power generator 100 shown in FIG. 8 to the field. Referring to FIG. 9 , the offshore wind power generator 100 assembled by FIGS. 5 to 8 operates while maintaining a towing speed within an allowable wave height and is transferred to an installed offshore location.

10 is a view showing a process of moving the sliding deck 420 in the offshore wind power generator 100 shown in FIG. Referring to FIG. 10 , when the offshore wind power generator 100 arrives at an installed offshore location, the sliding deck 420 vertically moves the hull 410 so that the offshore wind generator 110 can be unloaded at the same location. ) is moved backwards.

During sea transport, the upper structure 310 and the lower structure 320, which are divided structures, have the same self weight (or the difference in weight within the allowable range of wire friction force) is bound to both ends of the wire, so that the balance can be maintained.

For offshore installation of the offshore wind power generator 110 , the unloading of the lower structure 320 and the lifting of the upper structure 310 are required. To this end, first, after disassembling the wire stopper ( 433 in FIG. 4 ), an additional weight, etc. is applied to the lower structure 320 from which the wire 440 is unloaded so that the balance may be lost.

Each of the upper and lower structures 310 and 320 is bound to a wire 440 having a constant length, so that the upper structure 310 is lifted by the height at which the lower structure 320 is unloaded. In particular, since the tower 313 and the supporting structure 321 are concentrically constrained in each divided structure, the lifting and discharging paths are limited in the vertical direction, and unnecessary movement is minimized.

In addition, the additional weight of the lower structure 320 can be secured through the ballast. Seawater can be injected into the ballast by operating a separate pump (not shown) inside the plinth 321-5 and the inclined member 321-4 of the support structure 321 .

FIG. 11 is a view showing a concept of combining a divided structure in the offshore wind power generator 100 shown in FIG. 8 . Referring to FIG. 11 , the base 322 of the lower structure 320 is suspended at the top of the seabed ground 10 . After that, the upper end of the connecting element portion 321-3 and the lower end of the tower 313b are positioned at the same height, and then a combination operation is performed to form a single offshore wind power generator structure. That is, a flange coupling method, a grouting injection method at the coupling site, etc. may be made.

FIG. 12 is a view showing the process of penetrating the base 322, releasing the wire binding, and completing the installation in the offshore wind power generator 100 shown in FIG. 8 . Referring to FIG. 12 , after moving the end of the wire 440 coupled to the binding part 321-1 to the binding part of the lower structure and binding it, the penetration operation of the seabed ground 10 of the base part 322 is performed. After completing the ground penetration work of the foundation, the wire binding is released from the offshore wind power generator 110, and the transport vessel 120 withdraws and returns to the hinterland.

In another embodiment of the present invention, each divided structure may be formed to have the same level of self-weight. If there is a difference in the weight of the upper structure and the lower structure of the offshore wind power generator, a divided structure can be formed by combining a part of the heavier structure with the lighter structure to adjust the weight to a similar level. For example, when the upper structure is heavier than the lower structure, there is a method of relocating some devices such as a power converter and a transformer located inside the lower part of the tower included in the upper structure to the lower structure.

On the other hand, when the lower structure is heavier than the upper structure, there is a method of reducing the weight of the lower structure or lowering the height of the connecting element (separation distance from sea level). In the latter case, the tower height may be increased to maintain the same nacelle height.

Although the description is omitted in the configuration and/or operation principle of the present invention, a shock absorber may be provided between the lower end of the tower and the support structure in which the two divided structures are in contact in order to smoothly install the divided structure. In a specific embodiment, a pneumatically actuated circular rubber tube may be formed.

According to the above embodiment, during sea transport, the inside of the rubber tube is pneumatically filled to fill the space corresponding to the clearance between the bottom of the tower and the support structure. On the other hand, during the installation of the offshore wind power generator, the rubber tube must rotate in place so that each division structure can be lifted and unloaded smoothly.

100: offshore wind power generation device
110: offshore wind generator
120: transport vessel
310: superstructure 311: rotor-blade
312: nacelle 313: tower
320: lower structure
321: support structure 321-1: binding portion
321-2: deck platform 321-3: connecting element part
321-4: inclined member 321-5: plinth
322: base
410: hull
420: sliding deck
430: support frame
440: wire
441: first wire portion 442: second wire portion
443: wire stopper
451,452: clamp
510: harbor quay wall
520: land crane
530: mounting structure

Claims (17)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete (a) assembling the offshore wind power generator 110 sequentially by using the onshore crane 520 on the transport vessel 120 moored to the harbor quay wall 510 and the split structure of the upper structure 310 and the lower structure 320 and a mounting step of mounting;
(b) a wire binding step of fastening both ends of the wire 440 to the binding portions 321-1 positioned in pairs on the upper structure 310 and the lower structure 320;
(c) an offshore transport step in which the offshore wind power generator 110 is mounted on the transport vessel 120 and transported by sea;
(d) lowering the lower structure 320 using the wire 440 at the installation point of the offshore wind power generator 110, and lifting the upper structure 310 by lifting ;
(e) a coupling step of coupling the upper structure 310 and the lower structure 320 after the base 322 of the lower structure 320 is mounted on the top of the seabed ground 10; and
(f) when the base part 322 penetrates the seabed ground 10, the completion step of releasing the binding of the wire 440 from the offshore wind power generator 110;
Offshore wind generator installation method comprising a.
16. The method of claim 15,
An offshore wind generator installation method, characterized in that the coupling of the upper structure 310 and the lower structure 320 is performed using a flange coupling method or a grout injection method.
16. The method of claim 15,
A wire stopper binding step of binding or fixing the wire 440 using a wire stopper 443 so that the wire 440 does not lose its balance even in an external disturbance between steps (b) and (f); Offshore wind generator installation method comprising a.

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