CN116181583A - Stand floating type offshore wind power generation system and construction method thereof - Google Patents

Abstract

The invention discloses a column floating type offshore wind power generation system and a construction method thereof, wherein a column type tower barrel and a column type fan foundation are integrally designed to form an integral steel ladle concrete cylinder structure or a double-layer steel ladle concrete cylinder structure with a built-in cavity, so that the gravity center of the integral structure can be downwards moved, the defects of overlong and too deep draft of the traditional column type foundation are avoided, meanwhile, the bending strength of the fan tower barrel is improved, and the problem of insufficient anti-capsizing capability is avoided. Meanwhile, the buoyancy cabin is designed and arranged in a petal mode, and on the premise of keeping stability of a fan foundation, the buoyancy cabin is also beneficial to later installation and construction and reduces steel consumption of the whole structure. Thus, the defects of the traditional column type structure are overcome, and the difficulty that the deepwater wharf is required for transportation and installation is overcome; and simultaneously, the application range of the column structure is also improved.

Description

Stand floating type offshore wind power generation system and construction method thereof

Technical Field

The invention relates to the technical field of offshore wind power generation, in particular to a stand column floating type offshore wind power generation system and a construction method thereof.

Background

The floating type offshore wind power is connected with the seabed through the mooring system, is little influenced by the water depth, gets rid of the constraint of the topography and geological conditions of the complex seabed, has wide application range, and can obtain more wind energy resources. As one of the main forms of future deep sea wind energy development, floating offshore wind power has great development potential. The international floating offshore wind power foundation mainly comprises main foundation types such as upright Spar, semi-submersible type tension leg type TLP and the like; the neutral column Spar has unconditional stability, excellent movement performance, simple manufacturing process and low operation risk, but the traditional column Spar has large movement response in the heave direction, and has long and heavy structure, deeper draft, generally more than 80m, limited port access and difficult popularization and application in China. Meanwhile, in order to meet the policy requirement of offshore wind power competitive price surfing, the application of the large fan is a necessary choice besides going to deep sea. The application of the deep-open sea large fan not only has strict requirements on a fan foundation, but also has great challenges on the bending rigidity of a fan tower.

Chinese patent publication No. CN106759454B discloses a full-submersible separation type fan foundation, which can be fixed under water by a tension line and a catenary, and compared with a half-submersible floating type fan foundation, the full-submersible separation type fan foundation completely avoids the influence of wave load on the foundation, greatly reduces the dynamic response of the structure, greatly reduces the motion amplitude of the floating type fan, can ensure the stability in the vertical and horizontal directions, and provides a stable foundation form for a fan system. However, the patent only plays a role in providing buoyancy by adding a lower pontoon structure on a semi-submersible basis; for the fan foundation of the deep-open sea big fan, the structure is long and heavy, the bending strength of the tower barrel of the fan is weak, and overturning is easy to occur; in addition, the offshore wind turbine is moist at the bottom of the tower barrel due to the problems of tidal range, spray splashing and the like, and a platform with a certain height is required to be additionally arranged for storing the electrical device, so that inconvenience and cost are caused.

The floating type offshore wind power development in China is still in the demonstration stage of a prototype, and the demonstration prototype has the characteristics of shallower installation water depth, single type (semi-submersible type), and the like, so that in order to develop rich deep sea wind power resources in China, a novel floating type offshore wind power generation system which is suitable for China sea areas, high in economical efficiency and excellent in comprehensive performance is required to be designed.

Disclosure of Invention

The invention discloses a column floating type offshore wind power generation system and a construction method thereof, which not only solve the problems that the traditional column floating type foundation has smaller water plane, larger pitching and rolling values, influence the power generation benefit and have the limitations of construction and installation, but also solve the problems of insufficient bending rigidity and insufficient anti-capsizing capability of a deep-open sea big fan tower.

On the one hand, the upright post floating type offshore wind power generation system comprises a wind power generator 1, an upper tower barrel 2, a buoyancy cabin 3, a mooring system, a bottom tower barrel 51 and an upright post type fan foundation 52, wherein the bottom tower barrel 51 and the upright post type fan foundation 52 are designed into an integrated structure, the integrated structure is a cylindrical structure 5 of steel ladle concrete, the wind power generator 1 is arranged at the top of the upper tower barrel 2, the upper tower barrel 2 is connected with the bottom tower barrel 51 through a first connecting structure, and the buoyancy cabin 3 is connected with the cylindrical structure 5 through a second connecting structure.

Preferably, the cylindrical structure 5 of the ladle concrete is a solid single-layer ladle concrete cylindrical structure or a double-layer ladle concrete cylindrical structure with a built-in cavity, the solid single-layer ladle concrete cylindrical structure is provided with an outer steel layer 511 and a first concrete layer 512 poured into the outer steel layer 511, and the double-layer ladle concrete cylindrical structure with the built-in cavity is sequentially provided with the first steel layer 521, a second concrete layer 522, a second steel layer 523 and a cavity 524 from outside to inside.

Preferably, the second connection structure is a first flange 6, the buoyancy cabin 3 is composed of three or more variable cross-section rhombic structures, the buoyancy cabin 3 is uniformly distributed around the upper portion of the column type fan foundation 52 through the first flange 6 in a petal type, and the buoyancy cabin 3 is detachably connected with the column type fan foundation 52.

Preferably, the buoyancy cabin 3 is divided into a plurality of water-volume-adjustable water-separating cabins 31, each water-separating cabin 31 can be filled with buoyancy water independently, and the upper surfaces of the left side and the right side of the buoyancy cabin 3 are respectively and movably connected with heave plates 7.

Preferably, the mooring system consists of a first mooring structure 41 at the bottom of the column fan foundation 52 and a second mooring structure provided on the buoyancy module 3.

Preferably, the first mooring structure 41 is a tensioning mooring structure, the tensioning mooring structure comprises a tensioning anchor chain 411 and a fixed anchor 412, one end of the tensioning anchor chain 411 is connected to the bottommost center position of the column type fan foundation 52, and the other end of the tensioning anchor chain is connected to the fixed anchor 412; the second mooring structure is composed of three or more groups of elastic ropes 421 arranged on the buoyancy tanks 3 and anchor chains 422 fixed on the elastic ropes 421, one elastic rope 421 is connected between two adjacent buoyancy tanks 3, the elastic ropes 421 are connected to the positions, from the bottom of the buoyancy tanks 3 to the outer side, of the two adjacent buoyancy tanks 3, and the anchor chains 422 fixed on the seabed are connected to the middle position of each elastic rope 421.

Preferably, the cylindrical structure 5 of the ladle concrete is a variable-section cylindrical structure, the section of the bottom tower drum 51 of the cylindrical structure is smaller than that of the column type fan foundation 52, and the bottom tower drum 51 is provided with a grouting opening.

Preferably, the first connection structure is a second flange 8, the lower port of the upper tower 2 and the upper port of the bottom tower 51 are detachably connected through the second flange 8, and the upright fan foundation 52 is a structure with a large lower part and a small upper part.

On the other hand, the construction method of the upright post floating type offshore wind power generation system comprises the following steps:

s1, finishing machining and manufacturing of the upright type fan foundation 52, the bottom tower barrel 51, the buoyancy cabin 3, the upper tower barrel 2, the wind driven generator 1 and other parts in a workshop;

s2, transferring the column type fan foundation 52, the bottom tower drum 51 and the buoyancy cabin 3 into a dry dock, and completing preliminary assembly of the column type fan foundation 52, the bottom tower drum 51 and the buoyancy cabin 3;

s3, grouting in the column type fan foundation (52) and the column type bottom column type tower (51) is completed; the grouting is required to be continuously grouted in place at one time so as to form a solid ladle concrete cylinder structure with integrated design or a double-layer ladle concrete cylinder structure with integrated design and built-in cavity;

s4, after the grouting material reaches the design strength, opening a dock gate, putting a certain amount of seawater into the dock gate, and adjusting the buoyancy cabin 3 to enable the whole structure to be in a suspension state;

s5, towing the whole structure to a harbor, a wharf and the like by using a tugboat, and installing an upper tower 2 and a wind driven generator 1;

s6, after the wind driven generator 1 is hoisted, the buoyancy cabin 3 is adjusted to enable the whole fan structure to achieve design draft, the whole floating fan structure is towed to a design machine position, and mooring installation is completed.

Preferably, the step S5 includes:

towing the integral structure to a harbor, a wharf and the like by using a tugboat, and enabling the integral structure to sit on the seabed by adjusting the buoyancy cabin 3 to form a stable state of the seat bottom so as to install the upper tower 2 and the wind driven generator 1; depending on the chosen environment, the jack-up platform vessel or quay crane is chosen to complete the installation of the upper tower 2 and wind turbine 1.

Compared with the prior art, the invention has the beneficial effects that:

1. the bottom tower drum 51 and the upright type fan foundation 52 of the first embodiment adopt an integrated design to form an integral steel ladle concrete cylinder structure 5, so that the gravity center of the integral structure can be moved downwards, the overlength of a pile body can be avoided, the larger stability height is obtained, the bending strength of the fan tower drum is improved, and the problem of insufficient anti-overturning capability is avoided. Moreover, through the arrangement of the cylindrical structure 5 of the ladle concrete, the electric device can be directly arranged at the upper end of the bottom tower drum 51, so that the problem that an inner platform with a certain height is required to be arranged for storing the electric device due to the fact that the bottom of the traditional tower drum is wet due to factors such as tidal range, spray splashing and the like is avoided, the height of the tower drum can be reduced to a certain extent, and the economical efficiency is improved. Meanwhile, the cylindrical structure of the solid single-layer ladle concrete can also reduce the steel consumption.

2. The second connection structure is the setting of flange, and the independent buoyancy cabin of three or more of being convenient for is connected with column fan foundation through the flange, helps building the installation and in order to dismantle the maintenance after the trouble of arbitrary buoyancy cabin in later stage, avoids traditional floating structure to need whole floating to the shortcoming of pier maintenance, has saved the maintenance cost greatly. The buoyancy cabin is of a unique petal type design so that the steel consumption of the whole structure can be reduced on the premise of keeping the stability of a fan foundation and further in post-installation construction.

3. The arrangement of the plurality of water-tight cabins is convenient for each water-tight cabin to be filled with buoyancy water independently, so that the draft of the structure can be controlled effectively and flexibly; the buoyancy cabin both sides upper surface swing joint has the setting of heave plate, can effectively reduce the motion response on the structure heave direction, and has great water plane, has solved the problem that traditional column fan foundation water plane is little, motion response is big etc. exists, has satisfied the operation demand of the high-power fan in deep open sea.

4. The anchor chain of the second mooring structure is connected to the middle position of the elastic rope, so that the position of a mooring point can be effectively reduced, a larger mooring recovery moment arm is obtained, and a larger wave load at the water plane is avoided. Meanwhile, the mooring system formed by the flexibility of the elastic ropes connected in pairs and the rigidity of the anchor chain has better tensile resistance, and the safety of the mooring system is ensured.

5. The first connection structure is the setting of second flange to the installation, dismantlement and the maintenance of upper portion tower section of thick bamboo and bottom tower section of thick bamboo of being convenient for. The upright post type fan foundation is arranged in a structure with a large lower part and a small upper part so as to obtain a large stability height, and the structure is ensured to have remarkable hydrodynamic performance and wind wave resistance. Due to the structural characteristics of 'big-down', the weight of the pile foundation is increased through the application of the ladle concrete, the structural gravity center is reduced, the defects of overlong and too deep draft of the traditional column foundation can be avoided on the premise of ensuring the structural stability and safety, and the difficulty of transporting and installing a deepwater wharf is overcome; and simultaneously, the application range of the column structure is also improved.

6. The second embodiment of the present disclosure provides a cylindrical structure 5 of ladle concrete, which is a cylindrical structure of double-layer ladle concrete with a built-in cavity, and can realize downward movement of the center of gravity of the overall structure, and avoid overlength of the pile body, thereby obtaining a larger stability height, and improving the bending strength of the tower barrel of the fan, and avoiding the problem of insufficient anti-overturning capability. And through the setting of filling concrete between double-deck steel for electric installation can direct mount in the upper end of bottom tower section of thick bamboo 51, avoided because of considering the wet interior platform that needs to set up the certain height in order to deposit electric installation of traditional tower section of thick bamboo bottom that factors such as tidal range, spray splash caused, and can reduce tower section of thick bamboo height to a certain extent, improved economic nature. And through the arrangement of the cavity 524, submarine cables and personnel channels can be reserved, so that the submarine cables can be conveniently installed and personnel can pass through.

7. The construction method comprises the steps of prefabricating a column type fan foundation, a bottom tower barrel and a buoyancy cabin in a factory, transferring the column type fan foundation, the bottom tower barrel and the buoyancy cabin into a dock, performing primary assembly and grouting, after grouting, floating the whole structure to a bay through adjusting the buoyancy cabin, finishing the installation of the upper tower barrel and the fan offshore, and towing the whole structure to a design machine position to finish mooring after debugging so as to manufacture the column type floating offshore wind power generation system applicable to deep sea.

Drawings

Fig. 1 is a schematic perspective view of a wind power generation system.

Fig. 2 is a schematic top view of the wind turbine and the upper tower hidden in this case.

Fig. 3 is a schematic view of the internal structure of the buoyancy chamber of the present case.

Fig. 4 is a schematic structural view of a cylindrical structure of solid single-layer ladle concrete according to the first embodiment of the present disclosure.

Fig. 5 is a schematic structural view of a cylindrical structure of a double-layer ladle concrete with a built-in cavity according to the second embodiment of the present disclosure.

Fig. 6 is a schematic flow chart of the construction method.

Detailed Description

The following examples are provided to illustrate the features of the present invention and other related features in further detail to facilitate understanding by those skilled in the art:

example 1

As shown in fig. 1 to 4, a column floating type offshore wind power generation system includes a wind power generator 1, an upper tower 2, a buoyancy tank 3, a mooring system, a bottom tower 51, and a column type wind turbine foundation 52. The design of bottom tower section of thick bamboo 51 and stand fan foundation 52 is integrated structure, integrated structure is ladle concrete's cylinder structure 5, aerogenerator 1 installs the top at upper portion tower section of thick bamboo 2, upper portion tower section of thick bamboo 2 is connected with bottom tower section of thick bamboo 51 through first connection structure, buoyancy cabin 3 through second connection structure with cylinder structure 5 is connected. The cylindrical structure 5 of the steel ladle concrete is a solid single-layer steel ladle concrete cylindrical structure, the solid single-layer steel ladle concrete cylindrical structure is provided with an outer steel layer 511 and a first concrete layer 512 poured into the outer steel layer 511, the solid single-layer steel ladle concrete cylindrical structure refers to a steel structure outside the cylindrical structure, and a concrete structure inside the cylindrical structure; in actual fabrication, the interior of the cylinder is filled with high density concrete through grout holes in the wall of the bottom tower 51 of the integrated structure to form the concrete structure/first concrete layer 512.

As described above, the bottom tower 51 and the upright fan foundation 52 of the first embodiment of the present disclosure are integrally designed to form a cylindrical structure 5 of integral steel ladle concrete, so as to realize downward movement of the center of gravity of the integral structure, and avoid overlong pile body, thereby obtaining a larger stability, improving the bending strength of the fan tower, and avoiding the problem of insufficient anti-overturning capability. Moreover, through the arrangement of the cylindrical structure 5 of the ladle concrete, the electric device can be directly arranged at the upper end of the bottom tower drum 51, so that the problem that an inner platform with a certain height is required to be arranged for storing the electric device due to the fact that the bottom of the traditional tower drum is wet due to factors such as tidal range, spray splashing and the like is avoided, the height of the tower drum can be reduced to a certain extent, and the economical efficiency is improved. Meanwhile, the cylindrical structure of the solid single-layer ladle concrete can also reduce the steel consumption.

As shown in fig. 1 and 2, the second connection structure is a first flange 6, the buoyancy chamber 3 is formed by three or more variable cross-section rhombic structures, the buoyancy chamber 3 is uniformly distributed around the upper part of the upright fan foundation 52 through the first flange 6 in a petal shape, and the buoyancy chamber 3 is detachably connected with the upright fan foundation 52. In specific implementation, the first flange 6 is fixedly installed at the boundary between the bottom tower 51 and the upright fan foundation 52, and the buoyancy tanks 3 are detachably connected to the first flange 6 through bolts respectively, so that the buoyancy tanks 3 encircle along the boundary and are uniformly distributed in petal shape. The number of the buoyancy tanks 3 can also be more than three, such as four, five, six and the like, and the buoyancy tanks 3 can be arranged according to a certain shape to provide stable buoyancy.

As described above, the second connection structure is a flange, so that three or more independent buoyancy tanks 3 can be conveniently connected with the upright fan foundation 52 through the flange, thereby facilitating the construction and installation and the disassembly and maintenance after any buoyancy tank 3 is in failure in the later stage, avoiding the defect that the traditional floating structure needs to be integrally floating to the wharf for maintenance, and greatly saving the maintenance cost. The buoyancy cabin 3 is of a unique petal type design so that the steel consumption of the whole structure can be reduced while the stability of a fan foundation is maintained.

As shown in fig. 2 and 3, the buoyancy chamber 3 is internally divided into a plurality of water-volume-adjustable water-separating chambers 31, and each water-separating chamber 31 can be filled with buoyancy water individually. The upper surfaces of the left side and the right side of the buoyancy cabin 3 are respectively and movably connected with a heave plate 7, and the movable connection mode can be hinge connection or pin shaft connection. In practice, the heave plate 7 is disposed along the outer edge of the buoyancy chamber 3 in the horizontal direction, and the heave plate 7 is a thin plate.

As described above, the arrangement of the plurality of water-tight cabins 31 facilitates that each water-tight cabin 31 can be filled with buoyancy water independently, and thus the structure draft can be controlled effectively and flexibly; the buoyancy cabin 3 both sides upper surface swing joint has the setting of heave plate 7, can effectively reduce the structural motion response on the heave direction, and has great water plane, has solved the problem that traditional column fan foundation water plane is little, motion response is big etc. exists, has satisfied the operation demand of the high-power fan in deep open sea.

As shown in fig. 1 and 2, in practice, the mooring system consists of a first mooring structure 41 at the bottom of a column fan foundation 52 and a second mooring structure provided on the buoyancy module 3. The first mooring structure 41 is a tensioning mooring structure, the tensioning mooring structure comprises a tensioning anchor chain 411 and a fixed anchor 412, one end of the tensioning anchor chain 411 is connected to the bottommost center position of the upright fan foundation 52, and the other end of the tensioning anchor chain is connected to the fixed anchor 412. In this way, the restoring force is provided by the elastic elongation of the taut mooring structure, and the anchor 412 is subjected to both horizontal and vertical forces, ensuring the stability of the wind power generation system.

As shown in fig. 1 and fig. 2, in the implementation, the second mooring structure is composed of a plurality of groups of elastic cables 421 arranged on the buoyancy tanks 3 and anchor chains 422 fixed on the elastic cables 421, one group of elastic cables 421 and one anchor chain 422 are formed, one elastic cable 421 is connected between two adjacent buoyancy tanks 3, three elastic cables 421 are provided in total, and an anchor chain 422 fixed on the seabed is connected to the middle position of each elastic cable 421. In specific implementation, one end of each elastic rope 421 is connected to the position of the bottom of the buoyancy chamber 3 facing to the outside through a cable guide hole 32 on the buoyancy chamber 3, and the other end is connected to the position of the bottom of the other buoyancy chamber 3 facing to the outside through a cable guide hole 32 on the other buoyancy chamber 3. In practical application, the elastic cables 421 can be correspondingly arranged according to the number of the buoyancy tanks 3, for example, four elastic cables 421 are required to be arranged for four buoyancy tanks 3, and four anchor chains 422 are correspondingly arranged.

As described above, by the arrangement that the anchor chain 422 of the second mooring structure is connected to the middle position of the elastic rope 421, the mooring point position can be effectively reduced, so as to obtain a larger mooring recovery moment arm, and avoid a larger wave load at the water plane. Meanwhile, the mooring system formed by the flexibility of the elastic ropes 421 connected in pairs and the rigidity of the anchor chains 422 has better tensile resistance, and the safety of the mooring system is ensured.

In the above embodiment, the cylindrical structure 5 of the ladle concrete is a variable-section cylindrical structure, the section of the bottom tower 51 of the cylindrical structure is smaller than the section of the column fan foundation 52, and the bottom tower 51 is provided with a grouting hole. In this way, it is convenient to pour concrete into the interior of the cylindrical structure.

As shown in fig. 1, the first connection structure is a second flange 8, the lower port of the upper tower 2 and the upper port of the bottom tower 51 are detachably connected through the second flange 8, and the upright fan foundation 52 is a structure with a large bottom and a small top. In a specific implementation, the detachable connection may be a bolt connection.

As described above, the first connection structure is provided with the second flange 8, so as to facilitate the installation, the disassembly and the maintenance of the upper tower 2 and the bottom tower 51. The upright fan foundation 52 is provided with a structure with a large lower part and a small upper part so as to obtain a large stability height, and ensure that the structure has remarkable hydrodynamic performance and wind wave resistance. Due to the structural characteristics of 'big-down', the weight of the pile foundation is increased through the application of the ladle concrete, the structural gravity center is reduced, the defects of overlong and too deep draft of the traditional column foundation can be avoided on the premise of ensuring the structural stability and safety, and the difficulty of transporting and installing a deepwater wharf is overcome; meanwhile, the application range of the column type structure is also improved; and simultaneously, the application range of the column structure is also improved. The stability height refers to that the ship is inclined from the initial balance position under the action of external moment, and the ship has the capability of resisting external force and recovering the original balance state after the external moment is eliminated.

Example two

As shown in fig. 5, the second embodiment is different from the first embodiment in that: the cylindrical structure of the ladle concrete in the second embodiment is a double-layer ladle concrete cylindrical structure with a built-in cavity, the double-layer ladle concrete cylindrical structure with a built-in cavity is sequentially provided with a first steel layer 521, a second concrete layer 522, a second steel layer 523 and a cavity 524 from outside to inside, the first steel layer 521 is an outer wall of the cylindrical structure 5, the second steel layer 523 is a cavity wall, and the second concrete layer 522 is poured between the two steel layers. In the concrete implementation, the cylindrical structure of the double-layer ladle concrete with the built-in cavity is a cylindrical structure 5 of the double-layer steel wall and the hollow ladle concrete in the interior, and a concrete structure is arranged between the cylindrical double-layer steel walls; in actual manufacturing, the concrete structure/second concrete layer 522 is formed by filling high-density concrete between the cylindrical double-layer steel walls through the grouting openings on the wall of the tower drum 51 at the bottom of the integrated structure.

As described above, in the second embodiment, the cylindrical structure 5 of the ladle concrete is a double-layer ladle concrete cylindrical structure with a built-in cavity, so that the center of gravity of the whole structure can be moved downwards, and the pile body can be prevented from being too long, so that a larger stability height can be obtained, and meanwhile, the bending strength of the tower barrel of the fan can be improved, and the problem of insufficient anti-overturning capability can be avoided. And through the setting of filling concrete between double-deck steel for electric installation can direct mount in the upper end of bottom tower section of thick bamboo 51, avoided because of considering the wet interior platform that needs to set up the certain height in order to deposit electric installation of traditional tower section of thick bamboo bottom that factors such as tidal range, spray splash caused, and can reduce tower section of thick bamboo height to a certain extent, improved economic nature. And through the arrangement of the cavity 524, submarine cables and personnel channels can be reserved, so that the submarine cables can be conveniently installed and personnel can pass through.

Example III

As shown in fig. 6, the third embodiment is a construction method of a post-floating offshore wind power generation system, comprising the steps of:

s1, finishing machining and manufacturing of the upright type fan foundation 52, the bottom tower barrel 51, the buoyancy cabin 3, the upper tower barrel 2, the wind driven generator 1 and other parts in a workshop;

s2, transferring the column type fan foundation 52, the bottom tower drum 51 and the buoyancy cabin 3 into a dry dock, and completing preliminary assembly of the column type fan foundation 52, the bottom tower drum 51 and the buoyancy cabin 3; wherein the column fan foundation 52 is in a standing type. In actual assembly, the characteristic of large bottom of the column type foundation can be utilized, and the column type fan foundation 52 can be directly stood on the ground; the special jig fixture is used for completing the installation of the buoyancy cabin 3, so that the balance stress of each bolt of the buoyancy cabin 3 is ensured; finally, the installation of the bottom tower 51 is completed;

s3, grouting in the column type fan foundation 52 and the bottom tower drum 51 is completed; the grouting is required to be continuously grouted in place at one time so as to form a solid single-layer ladle concrete cylinder structure with integrated design or form a double-layer ladle concrete cylinder structure with an integrated design and a built-in cavity; when the cylindrical structure 5 is solid, grouting is directly performed on the inside of the cylinder. When the cylindrical structure 5 is provided with the cavity 524 inside, the grouting is needed to be performed on the space between the double-layer cylinder walls (double-layer steel layers) to form the cylindrical structure of the double-layer steel ladle concrete with the built-in cavity. Thus, the problem that the deep water wharf is required due to the fact that the traditional column type fan foundation 52 is too long in structure is solved, and the problem that the deep-sea large fan tower is insufficient in bending rigidity and insufficient in anti-overturning capacity is solved by filling concrete in the bottom tower 51; meanwhile, the cavity 524 is arranged inside, so that submarine cables and personnel channels can be reserved, and installation of the submarine cables and passing of personnel are facilitated. The method comprises the steps of carrying out a first treatment on the surface of the

S4, after the grouting material reaches the design strength, opening a dock gate, putting a certain amount of seawater into the dock gate, and adjusting the buoyancy cabin 3 to enable the whole structure to be in a suspension state;

s5, towing the integral structure to a harbor, a wharf and the like by using a tugboat, stabilizing the base of the integral structure by adjusting a buoyancy cabin 3, and installing an upper tower 2 and a wind driven generator 1 by using hoisting equipment such as a self-elevating platform ship or a wharf crane; the hoisting equipment can adopt the current common fan hoisting equipment, solves the problem of shortage of a ship machine for hoisting operation of a special fan in a deep sea area, and improves the hoisting efficiency;

s6, after the wind driven generator 1 is hoisted, the buoyancy cabin 3 is adjusted to enable the whole fan structure to achieve design draft, the whole floating fan structure is towed to a design machine position, and mooring installation is completed. The design draft refers to the draft achieved by the offshore wind power generation system. And the draft is the depth of the offshore wind power generation system in the water. The depth varies according to the design of the offshore wind power generation system.

As described above, the construction method of the present case comprises prefabricating the column type fan foundation 52, the bottom tower drum 51 and the buoyancy chamber 3 in a factory, transferring the prefabricated column type fan foundation into a dock, performing initial assembly and grouting, after grouting, floating the whole structure to the bay by adjusting the buoyancy chamber 3, finishing the installation of the upper tower drum 2 and the fan offshore, and after debugging, towing the prefabricated column type fan foundation to a design machine position to finish mooring, so as to manufacture the column type floating offshore wind power generation system suitable for deep sea.

From the above, the step S5 includes: towing the integral structure to a harbor, a wharf and the like by using a tugboat, and enabling the integral structure to sit on the seabed by adjusting the buoyancy cabin 3 to form a stable state of the seat bottom so as to install the upper tower 2 and the wind driven generator 1; depending on the chosen environment, the jack-up platform vessel or quay crane is chosen to complete the installation of the upper tower 2 and wind turbine 1. Therefore, dock resources and fan hoisting cost are greatly saved, and meanwhile, the process for hoisting the base of the fan hoisting device avoids the problem that the traditional upright post type floating fan foundation needs a deepwater wharf.

As described above, the scheme protects a column floating type offshore wind power generation system and a construction method thereof, and all technical schemes which are the same as or similar to the scheme are shown to fall into the protection scope of the scheme.

Claims (10)

1. The utility model provides a stand floats offshore wind power generation system, includes aerogenerator (1), upper portion tower section of thick bamboo (2), buoyancy cabin (3), mooring system, bottom tower section of thick bamboo (51) and stand fan foundation (52), its characterized in that bottom tower section of thick bamboo (51) and the design of stand fan foundation (52) are integrated structure, integrated structure is ladle concrete's cylinder structure (5), the top at upper portion tower section of thick bamboo (2) is installed in aerogenerator (1), upper portion tower section of thick bamboo (2) are connected with bottom tower section of thick bamboo (51) through first connection structure, buoyancy cabin (3) through second connection structure with cylinder structure (5) are connected.

2. The column floating offshore wind power generation system according to claim 1, characterized in that the cylindrical structure (5) of the ladle concrete is a solid single-layer ladle concrete cylindrical structure or a double-layer ladle concrete cylindrical structure with a built-in cavity, the solid single-layer ladle concrete cylindrical structure is provided with an outer steel layer (511) and a first concrete layer (512) poured into the outer steel layer (511), and the double-layer ladle concrete cylindrical structure with the built-in cavity is sequentially provided with a first steel layer (521), a second concrete layer (522), a second steel layer (523) and a cavity (524) from outside to inside.

3. The upright post floating type offshore wind power generation system according to claim 1, wherein the second connecting structure is a first flange (6), the buoyancy cabin (3) is composed of three or more variable cross-section rhombus structures, the buoyancy cabin (3) is uniformly distributed and arranged around the upper part of the upright post type fan foundation (52) in a petal shape through the first flange (6), and the buoyancy cabin (3) is detachably connected with the upright post type fan foundation (52).

4. A column floating offshore wind power generation system according to claim 3, characterized in that the inside of the buoyancy chamber (3) is divided into a plurality of independent water-volume-adjustable watertight chambers (31), each watertight chamber (31) can be filled with buoyancy water independently, and the upper surfaces of the left side and the right side of the buoyancy chamber (3) are respectively and movably connected with heave plates (7).

5. A column floating offshore wind power system according to claim 1, characterized in that the mooring system consists of a first mooring structure (41) at the bottom of the column fan foundation (52) and a second mooring structure arranged on the buoyancy tank (3).

6. A column floating offshore wind power generation system according to claim 5, characterized in that the first mooring structure (41) is a tension mooring structure comprising a tension anchor chain (411) and a fixed anchor (412), wherein one end of the tension anchor chain (411) is connected to the bottommost central position of the column fan foundation (52), and the other end is connected to the fixed anchor (412); the second mooring structure consists of three or more groups of elastic ropes (421) arranged on the buoyancy tanks (3) and anchor chains (422) fixed on the elastic ropes (421), one elastic rope (421) is connected between two adjacent buoyancy tanks (3), the elastic ropes (421) are connected to the positions, from the bottoms of the buoyancy tanks (3) to the outer sides, of the two adjacent buoyancy tanks, and the anchor chains (422) fixed on the seabed are connected to the middle positions of each elastic rope (421).

7. A post-floating offshore wind power generation system according to claim 1 or 2, characterized in that the cylindrical structure (5) of ladle concrete is a variable cross-section cylindrical structure, the cross-section of the bottom tower (51) of the cylindrical structure is smaller than the cross-section of the post-fan foundation (52), and the bottom tower (51) is provided with a grouting opening.

8. The column floating offshore wind power generation system according to claim 1, wherein the first connecting structure is a second flange (8), the lower port of the upper tower (2) is detachably connected with the upper port of the bottom tower (51) through the second flange (8), and the column fan foundation (52) is of a structure with a large lower part and a small upper part.

9. The construction method of the upright post floating type offshore wind power generation system is characterized by comprising the following steps of:

s1, finishing processing and manufacturing of parts such as a column type fan foundation (52), a bottom tower (51), a buoyancy cabin (3), an upper tower (2), a wind driven generator (1) and the like in a workshop;

s2, transferring the upright type fan foundation (52), the bottom tower barrel (51) and the buoyancy cabin (3) into a dry dock, and completing preliminary assembly of the upright type fan foundation (52), the bottom tower barrel (51) and the buoyancy cabin (3);

s3, grouting in the column type fan foundation (52) and the column type bottom column type tower (51) is completed; the grouting is required to be continuously grouted in place at one time so as to form a solid ladle concrete cylinder structure with integrated design or a double-layer ladle concrete cylinder structure with integrated design and built-in cavity;

s4, after the grouting material reaches the design strength, opening a dock gate, putting a certain amount of seawater into the dock gate, and adjusting the buoyancy cabin (3) to enable the whole structure to be in a suspension state;

s5, towing the integral structure to a harbor, a wharf and the like by using a tugboat, and installing an upper tower (2) and a wind driven generator (1);

s6, after the wind driven generator (1) is hoisted, the buoyancy cabin (3) is adjusted to enable the whole fan structure to achieve design draft, the whole floating fan structure is towed to a design machine position, and mooring installation is completed.

10. The method for constructing a post-floating offshore wind power generation system according to claim 9, wherein the step S5 comprises:

towing the integral structure to a harbor, a wharf and the like by using a tugboat, and enabling the integral structure to sit on the seabed by adjusting a buoyancy cabin (3) to form a stable state of the seat bottom so as to install an upper tower (2) and a wind driven generator (1); according to the selected environment, the jack-up platform ship or the wharf crane is selected to complete the installation of the upper tower (2) and the wind power generator (1).

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