Multifunctional tension leg deepwater wind power platform

Abstract

The invention discloses a multifunctional tension leg deepwater wind power platform, and relates to the technical field of floating offshore wind power generation platforms. The system comprises a multifunctional caisson fixing foundation, a multifunctional elastic mooring tension leg and a multifunctional floating foundation. The multifunctional elastic mooring tension leg comprises a multifunctional elastic mooring support, a tension leg middle connector, a self-floating mooring steel pipe and a tension leg fixing connector. The multifunctional caisson fixing foundation comprises three ballast tanks and tension leg fixing joint supporting beams. The multifunctional floating foundation comprises three floating boxes, two ballast tanks, a truss tower, a lifting type stand column, a lifting type wind driven generator tower column and a multifunctional elastic mooring support supporting beam. Various prefabricated parts can be divided into two groups to be assembled in the same dry dock and then are towed to the sea in a self-floating mode, only three tugs, an air lift mud suction tool, an air compressor, a high-pressure water pump and other common construction equipment need to be used in the offshore installation period, and therefore the engineering investment can be greatly reduced while the safety and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of floating offshore wind power generation platforms, and in particular to a multifunctional tension-leg deepwater wind power generation platform. Background Art

[0002] After research and summary, the inventors found that the main problems with existing tension platform design and construction engineering technologies at home and abroad are as follows:

[0003] (1) In the prior art, each TLP is equipped with only 6 to 16 tendons, each with a diameter of 0.3 to 0.6 meters. This design has a low pre-tension force, resulting in a large swing amplitude of the floating structure.

[0004] (2) Existing technologies typically use dispersed anchor piles, which require extremely high installation and positioning accuracy, are extremely difficult, and require high installation investment. If the anchor pile installation position error is too large, the actual tension of the hamstring tendon may deviate significantly from the designed tension, potentially leading to a safety hazard of platform collapse.

[0005] (3) In the prior art, the connection between the tendon and the floating structure must be locked simultaneously with the floating structure positioned at the center of the designed platform. Afterwards, the length and pre-tension cannot be adjusted. This can lead to a significant deviation between the actual working tension of the tendon and the calculated design tension.

[0006] (4) In the prior art, the upper end support of the tension leg is located at the lower end of the floating structure. The distance between the combined force of wind, wave and current loads acting on the wind turbine and the floating structure and the center of swing of the floating structure is particularly large, which will generate a huge overturning moment.

[0007] (5) In the prior art, the upper end of the column-type pontoon that provides pre-tension in the floating structure is located more than 20 meters above the sea level. Under the designed extreme sea conditions, when such a column is located at the highest wave crest, the actual working tension of the tension hamstring tendons near it will increase significantly; when the column is located at the lowest wave trough, the actual working tension of the tension hamstring tendons near it will decrease significantly, and even an extremely dangerous situation where the tension is less than zero may occur.

[0008] (6) In the prior art, the lower end of the tension leg tendon is connected by a quick-insertion ball joint. When the minimum tension is less than zero, the tension leg tendon may automatically unlock and detach from the support, causing a major accident in which the entire tension leg platform collapses into the water.

[0009] (7) In addition to the above-mentioned problems, another particularly important problem with the existing tension leg wind turbine platform is that the tower supporting the wind turbine is welded and fixed to the floating structure. When the generator and its impeller need to be overhauled or replaced, it can only be completed by renting a wind turbine installation engineering vessel with a daily rate of more than one million yuan. When the water depth of the wind farm exceeds 120 meters, it may be necessary to release the wind turbine and its floating foundation structure as a whole, tow it to the anchorage, and then complete it by a wind turbine installation engineering vessel with a lifting height of more than 200 meters. This type of maintenance plan has a long downtime and high project investment. Summary of the Invention

[0010] The main purpose of the present invention is to provide a multifunctional tension-leg deepwater wind power platform to overcome the problems existing in the prior art, reduce the technical risks of the tension-leg deepwater wind power platform as much as possible, and improve safety, reliability and economic benefits.

[0011] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0012] A multifunctional tension-leg deepwater wind power platform, comprising a multifunctional caisson fixed foundation, a multifunctional elastic mooring tension leg, and a multifunctional floating foundation. The multifunctional elastic mooring tension leg is connected between the multifunctional caisson fixed foundation and the multifunctional floating foundation, with its lower end connected to the multifunctional caisson fixed foundation and its upper end connected to the multifunctional floating foundation.

[0013] Eighteen to thirty-six multifunctional elastic mooring tension legs are installed on each platform. Each of the multifunctional elastic mooring tension legs includes a multifunctional elastic mooring support, four to five tension leg intermediate joints, three to four sections of self-floating mooring steel pipes and a tension leg fixed joint. The multifunctional elastic mooring support is located at the upper end of the multifunctional elastic mooring tension leg and is placed in the guide hole of the multifunctional elastic mooring support support beam of the multifunctional floating foundation during the prefabrication stage; the tension leg intermediate joint is used to connect the various components of each multifunctional elastic mooring tension leg in series into one; the self-floating mooring steel pipe is connected to its adjacent upper and lower end components through the tension leg intermediate joint; the tension leg fixed joint is located at the bottom end of the multifunctional elastic mooring tension leg and can be connected to the tension leg fixed joint support beam of the multifunctional caisson fixed foundation through a pin.

[0014] Furthermore, the multifunctional caisson fixed foundation includes a first ballast tank, a cofferdam-type ballast tank, a second ballast tank and a tension leg fixed joint support beam. The first ballast tank is used to store iron ore, the cofferdam-type ballast tank is used to store mud and sand discharged from under the foundation, the second ballast tank is used to connect the first ballast tank and the cofferdam-type ballast tank into an integral structure, and the tension leg fixed joint support beam is installed on the first ballast tank.

[0015] Furthermore, the outer contour of the multifunctional caisson fixed foundation forms an equilateral triangle with a side length of 92 meters to 115 meters. The number of the first ballast tanks and the second ballast tanks are three, and the three first ballast tanks are respectively located at the three vertices of the equilateral triangle, and the cofferdam-type ballast tank is located at the center of the equilateral triangle.

[0016] Furthermore, each platform is provided with six sections of the tension leg fixed joint support beams, and every two sections of the tension leg fixed joint support beams are respectively arranged on both sides of the first ballast tank, and each section of the tension leg fixed joint support beam is provided with four to six fixed hinge supports, which are connected to the tension leg fixed joint to provide precise positioning of the tension tendon.

[0017] Furthermore, an air lift mud suction tool guide hole and eight high-pressure water jet tool guide holes are provided between the top plate and the bottom plate of each first ballast tank, nine anti-slip pile guides and eighteen high-pressure water jet tool guide holes are provided between the top plate and the bottom plate of the cofferdam-type ballast tank, and three air lift mud suction tool guide holes and eight high-pressure water jet tool guide holes are provided between the top plate and the bottom plate of each second ballast tank.

[0018] Furthermore, the multifunctional floating foundation includes a first pontoon, a second pontoon, a third ballast tank, a third pontoon, a truss tower, a liftable ballast tank, a liftable column, a liftable wind turbine tower and a multifunctional elastic mooring support beam. The second pontoon is located at the center of an equilateral triangle formed by the three first pontoons. The third pontoon is used to connect the first pontoon and the second pontoon into an integral structure. The third ballast tank is connected between the first pontoon and the second pontoon. The upper end of the liftable column is connected to the liftable wind turbine tower, and the lower end passes through the truss tower and the second pontoon in sequence and is connected to the liftable ballast tank.

[0019] Furthermore, a guide ring is provided on the upper and lower ends of the inner plate of the second pontoon, and eight groups of pins are provided on the upper guide ring for locking the elevation of the lifting column, and eight lateral supports are provided on the lower guide ring for adjusting the center position of the lifting column.

[0020] Furthermore, the truss tower is mounted on the outside of the lifting column, the bottom end of the truss tower is connected to the top surface of the third pontoon, and the top surface of the truss tower is provided with sixteen horizontal limit supports and eight vertical limit pins for locking the lifting column.

[0021] Furthermore, the height of the lifting column is consistent with that of the lifting wind turbine tower, and a buoy is provided at the inner bottom end of the lifting column for lifting the lifting wind turbine tower and the generator set installed thereon.

[0022] Furthermore, the number of the multifunctional elastic mooring support beams is six, and every two of the multifunctional elastic mooring support beams are respectively arranged on both sides of the first pontoon. Each of the multifunctional elastic mooring support beams is provided with four to six guide holes, and the guide holes are connected to the multifunctional elastic mooring support for supporting the multifunctional elastic mooring support.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The multifunctional caisson fixed foundation adopted by the present invention can provide a precisely positioned fixed hinge support for the tension tendons, can realize self-floating towing, can be sunk and installed by the exhaust and water injection method, can be floated and displaced by the air injection and drainage method, and can be controlled by the air lift mud suction method to control the depth of the foundation structure buried in the seabed, so it can adapt to various seabed engineering geological conditions; it can withstand once-in-a-century wave and current loads under the combined action of the foundation structure's own weight, iron ore ballast and ballast water, so it can be installed at sea during the typhoon season; the foundation structure installation can also be completed by a construction fleet mainly composed of ordinary tugboats and barges, so the investment in the installation project can be greatly reduced.

[0025] The multifunctional elastic mooring tension legs used in the present invention can complete the assembly of tension tendons in a dry dock or anchorage and fix all tension leg fixed joints to the multifunctional caisson fixed foundation. After the multifunctional floating foundation structure is installed, the pre-tension of all tension tendons can be readjusted, and the tension leg components can be removed or replaced during the normal operation of the generator. The design, construction, installation, and overhaul and maintenance project investment of such tension legs is very low, so each tension leg platform can use more tension tendons, providing the multifunctional floating foundation structure with good anti-collision performance, large pre-tension, small swing amplitude, and overall stability close to the excellent technical performance of deep-water jacket platforms.

[0026] The multifunctional floating foundation adopted by the present invention is composed of a variety of deep-diving underwater buoyancy boxes, ballast tanks, lifting columns and lifting ballast tanks. The functional characteristics of this type of floating structure are: the buoyancy is not affected by the changes in wave crests and troughs, the wave and current loads acting on the floating structure can generate a sufficiently large anti-tilting stability moment, the resultant force point of the wind, wave and current loads can be controlled near the swing center of the floating foundation structure, the total center of gravity height of the wind turbine and its supporting structure can be lowered to below its swing center, the dynamic performance of the floating structure can be effectively improved, and the stress conditions of the tension tendons can be improved.

[0027] The present invention adopts a combined design of a liftable wind turbine tower and a liftable column, which can lower the center of the wind turbine generator set and its impeller to 40 to 50 meters from sea level. Therefore, the lifting task of replacing the wind turbine generator set and its impeller at sea can be completed using only a large tugboat and a crawler crane, which can significantly reduce the investment in the maintenance project of the offshore wind turbine generator set and its impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the fixed foundation structure of the multifunctional caisson of the present invention.

[0030] Figure 3 This is a schematic diagram of the exploded structure of the multifunctional elastic mooring tension leg of the present invention.

[0031] Figure 4 This is a schematic diagram of the multifunctional floating foundation structure of the present invention.

[0032] Explanation of Reference Numerals: 101. First ballast tank; 102. Cofferdam ballast tank; 103. Second ballast tank; 104. Tension leg fixed joint support beam; 105. Anti-slip pile guide tube; 106. High-pressure water jet tool guide hole; 107. Air lift mud suction tool guide hole;

[0033] 201. Multifunctional elastic mooring support; 202. Tension leg intermediate joint; 203. Self-floating mooring steel pipe; 204. Tension leg fixed joint;

[0034] 301. First pontoon; 302. Second pontoon; 303. Third ballast tank; 304. Third pontoon; 305. Truss tower; 306. Liftable ballast tank; 307. Liftable column; 308. Liftable wind turbine tower; 309. Multifunctional elastic mooring support beam. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0036] Combine Figures 1 to 4 The present invention provides a multifunctional tension-leg deepwater wind power platform, comprising a multifunctional caisson fixed foundation, a multifunctional elastic mooring tension leg and a multifunctional floating foundation. The multifunctional elastic mooring tension leg is connected between the multifunctional caisson fixed foundation and the multifunctional floating foundation, with its lower end connected to the multifunctional caisson fixed foundation and its upper end connected to the multifunctional floating foundation.

[0037] Eighteen to thirty-six multifunctional elastic mooring tension legs are installed on each platform. Each multifunctional elastic mooring tension leg includes a multifunctional elastic mooring support 201, four to five tension leg intermediate joints 202, three to four sections of self-floating mooring steel pipes 203 and a tension leg fixed joint 204. The multifunctional elastic mooring support 201 is located at the upper end of the multifunctional elastic mooring tension leg and is placed in the guide hole of the multifunctional elastic mooring support support beam 309 of the multifunctional floating foundation during the prefabrication stage; the tension leg intermediate joint 202 is used to connect the various components of each multifunctional elastic mooring tension leg into one; the self-floating mooring steel pipe 203 is connected to its adjacent upper and lower end components through the tension leg intermediate joint 202; the tension leg fixed joint 204 is located at the bottom end of the multifunctional elastic mooring tension leg and can be connected to the tension leg fixed joint support beam 104 of the multifunctional caisson fixed foundation through a pin.

[0038] Among them, in order to solve the problem of positioning error and large installation investment of the existing tension leg platform using dispersed anchor piles, the present invention adopts the following method: Figure 2 The multifunctional caisson fixed foundation design scheme shown.

[0039] The multifunctional caisson fixed foundation includes a first ballast tank 101, a cofferdam ballast tank 102, a second ballast tank 103 and a tension leg fixed joint support beam 104. The first ballast tank 101 is used to store iron ore, the cofferdam ballast tank 102 is used to store mud and sand discharged from under the foundation, the second ballast tank 103 is used to connect the first ballast tank 101 and the cofferdam ballast tank 102 into an integral structure, and the tension leg fixed joint support beam 104 is installed on the first ballast tank 101.

[0040] Specifically, the first ballast tank 101 is a square ballast tank, the cofferdam ballast tank 102 is a hexagonal cofferdam ballast tank, and the second ballast tank 103 is a rectangular ballast tank. One air lift mud suction tool guide hole 107 and eight high-pressure water jet tool guide holes 106 are provided between the top and bottom plates of each first ballast tank 101. Nine anti-slip pile guides 105 and eighteen high-pressure water jet tool guide holes 106 are provided between the top and bottom plates of the cofferdam ballast tank 102. Three air lift mud suction tool guide holes 107 and eight high-pressure water jet tool guide holes 106 are provided between the top and bottom plates of each second ballast tank 103.

[0041] Preferably, the outer contour of the multifunctional caisson fixed foundation forms an equilateral triangle with a side length of 92 meters to 115 meters. There are three first ballast tanks 101 and three second ballast tanks 103. The three first ballast tanks 101 are respectively located at the three vertices of the equilateral triangle, and the cofferdam-type ballast tank 102 is located at the center of the equilateral triangle.

[0042] Each multifunctional tension-leg deepwater wind power platform is provided with six sections of tension-leg fixed joint support beams 104, and each two sections of tension-leg fixed joint support beams 104 are respectively provided on both sides of the first ballast tank 101. Each section of tension-leg fixed joint support beam 104 is provided with four to six fixed hinge supports, which are connected to the tension-leg fixed joint 204 to provide precise positioning of the tension tendons.

[0043] The components of the multifunctional caisson fixed foundation structure can be prefabricated in a factory and then assembled in a dry dock. Precise positioning of the lower end fixing joint of the tension hamstring can be accomplished in the dry dock. The structure is capable of self-floating towing, can be sunk and installed using an exhaust and water injection method, can be leveled using a combination of air injection and drainage with air lift, and can be buried to a depth controlled using a combination of high-pressure water jetting and air lift. The structure can adapt to various complex submarine engineering geological conditions and design requirements, and can be rapidly installed offshore using primarily tugboats and crawler cranes.

[0044] Among them, in order to solve the problems of the existing tension leg platform, such as the small number of tension leg tendons available, the difficulty of installation technology, the high investment of installation project, the uneven pre-tension of the tension tendons, and the inability to replace the tension leg components after the offshore installation is completed. Figure 3 The multifunctional elastic mooring tension leg design is shown.

[0045] The multifunctional elastic mooring tension leg includes eighteen to thirty-six tension tendons, each of which includes a multifunctional elastic mooring support 201, a tension leg intermediate joint 202, multiple sections of self-floating mooring steel pipes 203 and a tension leg fixed joint 204. The top of the multifunctional elastic mooring support 201 is connected to the multifunctional elastic mooring support support beam 309 of the multifunctional floating foundation, and the bottom end is connected to the self-floating mooring steel pipe 203 located above through the tension leg intermediate joint 202. Adjacent self-floating mooring steel pipes 203 are connected through the tension leg intermediate joint 202. The bottom end of the tension leg fixed joint 204 is connected to the tension leg fixed joint support beam 104 of the multifunctional caisson fixed foundation, and the top end is connected to the self-floating mooring steel pipe 203 located below through the tension leg intermediate joint 202.

[0046] Specifically, each tension tendon consists of a multifunctional elastic mooring support 201, three to four sections of self-floating mooring steel pipes 203 (which can also be replaced by one section of self-floating mooring steel pipe and one section of mooring cable), four to five tension leg intermediate joints 202 and one tension leg fixed joint 204.

[0047] With this solution, all tension leg components can be assembled in a dry dock or at anchor, and each tension leg fixing joint 204 can be secured to the multifunctional caisson fixed foundation structure. During the water-filled, sunk, and installed multifunctional caisson fixed foundation structure, each tendon automatically rises to an upright position. This reduces the amount of offshore installation work and saves installation investment. Furthermore, the tension leg pre-tension can be readjusted after the tension leg platform is installed, allowing for replacement of tendons without disrupting normal production.

[0048] Among them, in order to solve the problems of the existing tension withdrawal platform with a high center of gravity of the floating structure, a large overturning moment, the maximum working tension of the tension hamstring tendon may exceed twice the average pre-tension, and the minimum working tension may be less than zero, the present invention adopts Figure 4 The multifunctional floating foundation design scheme is shown.

[0049] The multifunctional floating foundation includes a first pontoon 301, a second pontoon 302, a third ballast tank 303, a third pontoon 304, a truss tower 305, a liftable ballast tank 306, a liftable column 307, a liftable wind turbine tower 308 and a multifunctional elastic mooring support beam 309. The second pontoon 302 is located at the center of an equilateral triangle formed by the three first pontoons 301. The third pontoon 304 is used to connect the first pontoon 301 and the second pontoon 302 into an integral structure. The third ballast tank 303 is connected between the first pontoon 301 and the second pontoon 302. The upper end of the liftable column 307 is connected to the liftable wind turbine tower 308, and the lower end passes through the truss tower 305 and the second pontoon 302 in sequence and is connected to the liftable ballast tank 306.

[0050] Specifically, the first pontoon 301 adopts a square pontoon, the second pontoon 302 adopts a hexagonal pontoon, the third ballast tank 303 adopts a rectangular ballast tank, the third pontoon 304 adopts a rectangular pontoon, the truss tower 305 adopts a hexagonal truss tower, and the lifting column 307 adopts a lifting pen-shaped column.

[0051] There are six multifunctional elastic mooring support beams 309, and every two multifunctional elastic mooring support beams 309 are respectively arranged on both sides of the first pontoon 301. Each multifunctional elastic mooring support beam 309 is provided with four to six guide holes, which are connected to the multifunctional elastic mooring support 201 for supporting the multifunctional elastic mooring support 201.

[0052] Preferably, a guide ring is provided at the upper and lower ends of the inner plate of the second pontoon 302, and eight groups of pins are provided on the upper guide ring for locking the elevation of the lifting column 307, and eight lateral supports are provided on the lower guide ring for adjusting the center position of the lifting column 307.

[0053] Preferably, the truss tower 305 is mounted on the outside of the lifting column 307, and the bottom end of the truss tower 305 is connected to the top surface of the third pontoon 304. The top surface of the truss tower 305 is provided with sixteen horizontal limit supports and eight vertical limit pins for locking the lifting column 307.

[0054] Preferably, the heights of the lifting column 307 and the lifting wind turbine tower 308 are consistent, and a buoy is provided at the inner bottom of the lifting column 307 for lifting the lifting wind turbine tower 308 and the generator set installed thereon.

[0055] Various pontoons and ballast tanks with top decks submerged at depths exceeding 15 meters are used to minimize the effects of wave crests and troughs on the working tension of the hamstrings. A combination of elevating columns 307 and elevating ballast tanks is employed to regulate the floating substructure's center of buoyancy and center of gravity. The elevating ballast tanks range in diameter from 30 to 50 meters and in height from 8 to 12 meters. During in-harbor towing, these ballast tanks provide 5,000 to 10,000 tons of net buoyancy to support the floating substructure and its wind turbine equipment. During offshore towing, 5,000 to 10,000 tons of iron ore can be loaded into the ballast tanks. During offshore towing and installation, exhaust and water injection can be used to lower the floating structure's center of gravity, improving its floating stability.

[0056] During normal production operations, the aforementioned measures can be used to control the point of action of the combined wind, wave, and current loads on the floating foundation structure near its center of oscillation. This can significantly reduce the overturning moment, effectively improving the floating foundation's kinematic performance and the stress conditions on the tension hamstrings.

[0057] In order to solve the engineering and technical problems of replacing wind turbines and their impellers at sea, the present invention adopts Figure 3 The conceptual design and operational method for the liftable wind turbine tower 308 and liftable columns 307 within the multifunctional floating foundation structure are shown. Assuming the liftable wind turbine tower 308 is 120 to 140 meters tall, and the liftable columns 307 are also 120 to 140 meters tall, a 30-meter-long buoy is placed within the liftable columns 307. During offshore wind turbine and impeller replacement, the upper end of the liftable wind turbine tower 308 can be lowered to 30 to 40 meters above sea level. This allows the replacement of the wind turbine and its impeller to be accomplished offshore using a large tugboat and crawler crane.

[0058] Example 1

[0059] The examples of the conceptual design scheme of the multifunctional tension-leg deepwater wind power platform disclosed in the present invention include six prefabricated structures: a multifunctional caisson fixed foundation structure, a multifunctional elastic mooring tension leg, a multifunctional floating foundation structure, a liftable ballast tank with adjustable water depth and center of gravity height, a liftable column and a liftable wind turbine tower.

[0060] The prefabricated components of the above six structures can be manufactured separately in different factories. Then they are assembled in two groups in a dry dock with a length of more than 300 meters and a door width of more than 100 meters. The group near the dry dock door is the one of the present invention. Figure 2 and Figure 3 The multifunctional caisson fixed foundation structure and multifunctional elastic mooring tension leg shown; the other group is the attached Figure 4 The multifunctional floating foundation structure shown includes various underwater pontoons, underwater ballast tanks, lifting columns and lifting wind turbine towers, which can be simultaneously assembled in the rear of the dry dock.

[0061] The number, features and main specifications and dimensions of various components are described as follows in conjunction with the drawings of this embodiment:

[0062] like Figure 2 As shown, the multifunctional caisson fixed foundation structure has a total length of 80 to 100 meters and a total width of 100 to 125 meters. The number, specifications, dimensions and main functions of its main prefabricated components are described as follows:

[0063] Three square ballast tanks are required, each measuring 16 to 20 meters on a side and 18 to 26 meters high. All three ballast tanks described in this example are empty during the harbor towage process. While awaiting towage to the anchorage, they are then filled with solid ballast according to design requirements. After installation at sea, they are then filled with ballast water.

[0064] One equilateral hexagonal cofferdam ballast tank, with inner sides measuring 8 to 12 meters, outer sides measuring 16 to 20 meters, and a height of 8 to 12 meters. The inner side of this ballast tank's cofferdam serves as a grit chamber to collect sediment discharged from the foundation structure during installation. This example assumes favorable seabed engineering geology in the northern South China Sea at depths of 120 to 200 meters, therefore employing an equilateral hexagonal cofferdam. If the engineering geology is less favorable during the actual engineering design phase, an unequal hexagonal cofferdam may be employed to create a larger grit chamber, providing greater anti-slip resistance for the foundation structure.

[0065] Three rectangular ballast water tanks, each 30 to 39 meters long, 16 to 20 meters wide, and 8 to 12 meters high. The bottom plates of the rectangular ballast water tanks are flush with the bottom plates of the hexagonal pontoons in component 302.

[0066] The tension leg fixed joint supports 6 beams, each 6 to 8 meters long and 20 to 24 meters wide.

[0067] 9 pieces of anti-slip pile guide tubes, with diameters ranging from 3m to 4m and lengths ranging from 10m to 14m.

[0068] There are 66 prefabricated components for high-pressure water jetting tool guide holes, divided into two types. Forty-two components of one type, with a diameter of 2 meters and lengths of 8 to 12 meters, are installed between the top and bottom plates of a cofferdam-type ballast tank and three rectangular ballast sections. Twenty-four components of the other type, with a diameter of 2 meters and lengths of 18 to 26 meters, are installed in three groups between the top and bottom plates of the three square ballast tanks.

[0069] There are 12 guide holes for airlift dredgers, divided into two categories. The first category consists of nine holes with diameters of 3 to 4 meters and heights of 10 to 12 meters, located between the top and bottom plates of three rectangular ballast tanks. The second category consists of three holes with diameters of 3 to 4 meters and heights of 18 to 26 meters, located between the top and bottom plates of three square ballast tanks.

[0070] like Figure 3 As shown in the figure, the main components and quantities of the multifunctional elastic mooring tension leg are as follows:

[0071] There are 6 groups of multifunctional elastic mooring supports, each group consists of 4 to 6 supports. The outer diameter of each elastic mooring support is 2 to 3 meters, and the design ultimate load capacity of each support is 2,000 to 3,000 tons.

[0072] Tension leg intermediate joints, each tension leg uses 4 to 5 intermediate joints.

[0073] For design water depths between 120m and 300m, the self-floating mooring pipe can be composed of three or four sections. If the design water depth exceeds 300m, each tension leg can be composed of two to three sections of self-floating mooring pipe and one section of mooring cable or mooring rope.

[0074] Tension leg fixed joint, one fixed joint for each leg.

[0075] like Figure 4 As shown, the names, quantities and specifications of the prefabricated components of the multifunctional floating foundation structure are as follows:

[0076] Three square buoyancy tanks, each 20 meters long and 24 to 32 meters high, will be constructed based on iterative mooring tension calculations. Each square buoyancy tank will feature a 2-meter-diameter watertight hatch cover, a 3- to 5-meter-diameter movable riser, and a temporary mounting flange to provide dry access for annual inspections and maintenance. The center of each square buoyancy tank will be 50 to 60 meters from the center of the floating substructure.

[0077] The equilateral hexagonal pontoon has an outer plate with a side length of 12 meters, an inner annular plate with an inner diameter of 12.1 to 14.1 meters, and a height of 20 meters. A guide ring is provided at the upper and lower ends of the inner plate to define the position of the lower section of the lifting tower. Eight sets of pins with a diameter of 0.2 meters are provided on the guide ring at the upper end of the inner plate to lock the elevation of the lower section of the tower. Eight lateral supports are provided on the guide ring at the lower end of the inner annular plate to adjust the center position of the lower section of the lifting tower. The guide ring has an inner diameter of 12.1 to 14.1 meters, an outer diameter of 14 to 16 meters, and a height of 1 meter.

[0078] There are three rectangular ballast water tanks with a length of 30 meters to 39 meters, a width of 16 meters to 20 meters, and a height of 4 meters.

[0079] Rectangular pontoon, length 30m to 39m, width 16m to 20m, height 4m.

[0080] One equilateral hexagonal truss tower, with sides ranging from 8 to 12 meters and a height of 24 meters. The upper level of the hexagonal truss tower is equipped with 16 horizontal limit bearings and 8 vertical limit pins to lock the lower section of the lifting tower column component 307.

[0081] One lifting ballast tank, with an outer plate diameter of 30 to 60 meters, an inner diameter of 12 to 14 meters, and a height of 10 meters. The inner plate must be welded and fixed to the lower section of the lifting tower column of component 307 in the dry dock to form a single unit.

[0082] The lifting column has an outer diameter of 12 to 14 meters, an inner diameter of 8.1 to 10.1 meters, and a height of 100 to 120 meters. An olive-shaped buoy with an outer diameter of 7.9 to 9.9 meters and a net buoyancy of 2,000 to 3,000 tons is required inside the lifting column to carry out the lifting and lowering operations of the Component 308 lifting wind turbine tower and its unit.

[0083] The tower of a liftable wind turbine has an outer diameter of 8 to 10 meters and a height of 120 to 140 meters. The total weight, including the generator and impeller, is 2,000 to 3,000 tons.

[0084] The multifunctional elastic mooring support beam consists of six sections, each a cantilever beam. Each section is 6 to 8 meters long, 20 to 24 meters wide, and 4 to 6 meters high. Each section features four to six guide holes with a diameter of 3.01 meters, supporting four to six multifunctional elastic mooring supports.

[0085] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A multifunctional tension leg deepwater wind power platform, characterized in that: It includes a multifunctional caisson fixed foundation, a multifunctional elastic mooring tension leg and a multifunctional floating foundation. The multifunctional elastic mooring tension leg is connected between the multifunctional caisson fixed foundation and the multifunctional floating foundation, with its lower end connected to the multifunctional caisson fixed foundation and its upper end connected to the multifunctional floating foundation; Eighteen to thirty-six multifunctional elastic mooring tension legs are installed on each platform. Each multifunctional elastic mooring tension leg comprises a multifunctional elastic mooring support (201), four to five tension leg intermediate joints (202), three to four sections of self-floating mooring steel pipes (203) and a tension leg fixed joint (204). The multifunctional elastic mooring support (201) is located at the upper end of the multifunctional elastic mooring tension leg and is placed in the guide hole of the multifunctional elastic mooring support support beam (309) of the multifunctional floating foundation during the prefabrication stage. The tension leg intermediate joint (202) is used to connect the various components of each multifunctional elastic mooring tension leg in series. The self-floating mooring steel pipe (203) is connected to its adjacent upper and lower end components through the tension leg intermediate joint (202). The tension leg fixed joint (204) is located at the bottom end of the multifunctional elastic mooring tension leg and can be connected to the tension leg fixed joint support beam (104) of the multifunctional caisson fixed foundation through a pin.

2. The multifunctional tension leg deepwater wind power platform according to claim 1, characterized in that: The multifunctional caisson fixed foundation comprises a first ballast tank (101), a cofferdam ballast tank (102), a second ballast tank (103) and a tension leg fixed joint support beam (104); the first ballast tank (101) is used to store iron ore; the cofferdam ballast tank (102) is used to store mud and sand discharged from under the foundation; the second ballast tank (103) is used to connect the first ballast tank (101) and the cofferdam ballast tank (102) into an integral structure; and the tension leg fixed joint support beam (104) is installed on the first ballast tank (101).

3. The multifunctional tension leg deepwater wind power platform according to claim 2, characterized in that: The outer contour of the multifunctional caisson fixed foundation forms an equilateral triangle with a side length of 92 meters to 115 meters. The number of the first ballast tanks (101) and the second ballast tanks (103) are both three. The three first ballast tanks (101) are respectively located at the three vertices of the equilateral triangle, and the cofferdam-type ballast tank (102) is located at the center of the equilateral triangle.

4. The multifunctional tension leg deepwater wind power platform according to claim 2, characterized in that: Each platform is provided with six sections of the tension leg fixed joint support beams (104), and every two sections of the tension leg fixed joint support beams (104) are respectively provided on both sides of the first ballast tank (101), and each section of the tension leg fixed joint support beam (104) is provided with four to six fixed hinge supports, and the fixed hinge supports are connected to the tension leg fixed joint (204) to provide precise positioning for the tension tendon.

5. The multifunctional tension-leg deepwater wind power platform according to claim 2, characterized in that: An air lift mud suction tool guide hole (107) and eight high-pressure water jet tool guide holes (106) are provided between the top plate and the bottom plate of each first ballast tank (101), nine anti-slip pile guide tubes (105) and eighteen high-pressure water jet tool guide holes (106) are provided between the top plate and the bottom plate of the cofferdam-type ballast tank (102), and three air lift mud suction tool guide holes (107) and eight high-pressure water jet tool guide holes (106) are provided between the top plate and the bottom plate of each second ballast tank (103).

6. The multifunctional tension-leg deepwater wind power platform according to claim 1, characterized in that: The multifunctional floating foundation comprises a first pontoon (301), a second pontoon (302), a third ballast tank (303), a third pontoon (304), a truss tower (305), a liftable ballast tank (306), a liftable column (307), a liftable wind turbine tower (308) and a multifunctional elastic mooring support beam (309), wherein the second pontoon (302) is located at the center of an equilateral triangle formed by the three first pontoons (301), the third pontoon (304) is used to connect the first pontoon (301) and the second pontoon (302) into an integral structure, the third ballast tank (303) is connected between the first pontoon (301) and the second pontoon (302), the upper end of the liftable column (307) is connected to the liftable wind turbine tower (308), and the lower end passes through the truss tower (305) and the second pontoon (302) in sequence and is connected to the liftable ballast tank (306).

7. The multifunctional tension-leg deepwater wind power platform according to claim 6, characterized in that: A guide ring is provided at the upper and lower ends of the inner plate of the second buoyancy box (302), and eight groups of latches are provided on the upper guide ring for locking the elevation of the lifting column (307). Eight lateral supports are provided on the lower guide ring for adjusting the center position of the lifting column (307).

8. The multifunctional tension-leg deepwater wind power platform according to claim 6, characterized in that: The truss tower (305) is sleeved on the outside of the lifting column (307), the bottom end of the truss tower (305) is connected to the top surface of the third pontoon (304), and the top surface of the truss tower (305) is provided with sixteen horizontal limit supports and eight vertical limit pins for locking the lifting column (307).

9. The multifunctional tension-leg deepwater wind power platform according to claim 6, characterized in that: The heights of the lifting column (307) and the lifting wind turbine tower (308) are consistent, and a buoy is provided at the inner bottom end of the lifting column (307) for lifting and lowering the lifting wind turbine tower (308) and the generator set installed thereon.

10. The multifunctional tension-leg deepwater wind power platform according to claim 6, characterized in that: The number of the multifunctional elastic mooring support beams (309) is six, and each two multifunctional elastic mooring support beams (309) are respectively arranged on both sides of the first buoyancy box (301). Each multifunctional elastic mooring support beam (309) is provided with four to six guide holes, and the guide holes are connected to the multifunctional elastic mooring support (201) for supporting the multifunctional elastic mooring support (201).

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