Multifunctional tension leg deepwater wind power platform

Abstract

The utility model discloses a multifunctional tension leg deepwater wind power platform, and relates to the technical field of floating type offshore wind power generation platforms. Comprising a multifunctional caisson fixing foundation, multifunctional elastic mooring tension legs 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 out of the sea in a self-floating mode, only three tugs, an air lift mud suction tool, an air compressor and common construction equipment of a high-pressure water pump are needed in the offshore installation period, and therefore engineering investment can be greatly reduced while safety and reliability are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of floating offshore wind power generation platforms, specifically to a multi-functional tension leg deep-water wind power platform. Background Technology

[0002] Prior to 2011, more than twenty tension leg platforms had been built globally. Several of these tension leg wellhead platforms in the Gulf of Mexico collapsed during the same storm. Since 2011, many "marine engineering experts and scholars" both domestically and internationally have believed that the technology of tension leg platforms is too risky and have stopped participating in the design and research of large tension leg platforms. However, these previous researchers may not have known the root causes of the risks in the existing tension leg platform design and construction engineering technology, nor how to solve the existing problems.

[0003] After research and summarization, the inventor of this utility model has identified the following main problems with existing tension platform design and construction engineering technologies both domestically and internationally:

[0004] (1) In the prior art, each tension leg platform is equipped with only 6 to 16 tension tendons, and the diameter of each tension tendon is 0.3 meters to 0.6 meters. This design has a small pretension, which results in a large swing amplitude of its floating structure.

[0005] (2) In the existing technology, distributed anchor piles are usually used, which require particularly high installation and positioning accuracy, are particularly difficult, and have a high investment in installation projects. If the installation position error of the anchor piles is too large, there may be a problem that the actual tension of the tension leg tendon deviates too much from the design tension, which may lead to the safety hazard of platform collapse.

[0006] (3) In the existing technology, the connection between the tension tendon and the floating structure must be locked simultaneously with the floating structure located at the center of the designed platform. After that, the length and pretension cannot be adjusted. Therefore, it may also lead to the problem that the actual working tension of the tension tendon deviates too much from the design calculation tension.

[0007] (4) In the prior art, the upper support of the tension leg is located at the lower end of the floating structure. The distance between the point of action of the resultant force of the wind, wave and ocean current loads acting on the wind engine and the floating structure and the swing center of the floating structure is particularly large, which will generate a huge overturning moment.

[0008] (5) In the prior art, the upper end of the pre-tensioned column-type pontoon in the floating structure is located more than 20 meters above the sea level. Under extreme sea conditions, when such a column is located at the highest wave crest, the actual working tension of the tension leg tendon near it will increase significantly; when the column is located at the lowest wave trough, the actual working tension of the tension leg tendon near it will decrease significantly, and there may even be an extreme dangerous situation where the tension is less than zero.

[0009] (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, leading to a major accident in which the entire tension leg platform collapses and falls into the water.

[0010] (7) In addition to the problems mentioned above, another particularly important issue with existing tension leg wind turbine platforms is that the towers supporting the wind turbines are welded and fixed to the floating structure. When major overhauls and replacements of the generators and their rotors are required, only wind turbine installation vessels and cranes with daily rates exceeding one million yuan can be rented. When the water depth at the wind farm exceeds 120 meters, it may be necessary to detach the wind turbines and their floating foundations as a whole, tow them to an anchorage, and then have them installed by a wind turbine installation vessel with a lifting height of over 200 meters. This type of maintenance plan involves long downtime and high project investment. Utility Model Content

[0011] The main purpose of this utility model is to provide a multifunctional tension leg deep-water wind power platform to overcome the problems existing in the prior art, minimize the technical risks of the tension leg deep-water wind power platform, and improve safety, reliability and economic benefits.

[0012] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0013] A multi-functional tension leg deep-water wind power platform includes a multi-functional caisson fixed foundation, a multi-functional elastic mooring tension leg, and a multi-functional floating foundation. The multi-functional elastic mooring tension leg is connected between the multi-functional caisson fixed foundation and the multi-functional floating foundation, with its lower end connected to the multi-functional caisson fixed foundation and its upper end connected to the multi-functional floating foundation.

[0014] Each platform is equipped with eighteen to thirty-six multi-functional elastic mooring tension legs. Each multi-functional elastic mooring tension leg includes a multi-functional elastic mooring support, four to five tension leg intermediate joints, three to four sections of self-floating mooring steel pipe, and a tension leg fixing joint. The multi-functional elastic mooring support is located at the upper end of the multi-functional elastic mooring tension leg and is placed in the guide hole of the multi-functional elastic mooring support support beam of the multi-functional floating foundation during the prefabrication stage. The tension leg intermediate joint is used to connect the various components of each multi-functional elastic mooring tension leg into a whole. 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 fixing joint is located at the bottom end of the multi-functional elastic mooring tension leg and can be connected to the tension leg fixing joint support beam of the multi-functional caisson fixing foundation through a pin.

[0015] Furthermore, the multi-functional caisson fixing foundation includes a first ballast tank, a cofferdam-type ballast tank, a second ballast tank, and a tension leg fixing joint support beam. The first ballast tank is used to store iron ore, the cofferdam-type ballast tank is used to store silt discharged from 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 fixing joint support beam is installed on the first ballast tank.

[0016] Furthermore, the outer contour of the multi-functional caisson fixing foundation forms an equilateral triangle with a side length of 92 meters to 115 meters. There are three first ballast tanks and three second ballast tanks. The three first ballast tanks are located at the three vertices of the equilateral triangle, and the cofferdam-type ballast tank is located at the center of the equilateral triangle.

[0017] Furthermore, each platform is equipped with six sections of the tension leg fixed joint support beam. Every two sections of the tension leg fixed joint support beam are respectively located on both sides of the first ballast tank. Each section of the tension leg fixed joint support beam is equipped with four to six fixed hinge supports. The fixed hinge supports are connected to the tension leg fixed joint to provide precise positioning for the tension tendon.

[0018] Furthermore, each of the first ballast tanks has one air-lift mud suction tool guide hole and eight high-pressure water jet tool guide holes between its top and bottom plates. The cofferdam-type ballast tank has nine anti-sliding pile guide pipes and eighteen high-pressure water jet tool guide holes between its top and bottom plates. Each of the second ballast tanks has three air-lift mud suction tool guide holes and eight high-pressure water jet tool guide holes between its top and bottom plates.

[0019] Furthermore, the multifunctional floating foundation includes a first buoy, a second buoy, a third ballast tank, a truss tower, a liftable ballast tank, a liftable column, a liftable wind turbine tower column, and a multifunctional flexible mooring support beam. The second buoy is located at the center of an equilateral triangle formed by the three first buoys. The third buoy is used to connect the first buoy and the second buoy into an integral structure. The third ballast tank is connected between the first buoy and the second buoy. The upper end of the liftable column is connected to the liftable wind turbine tower column, and the lower end passes through the truss tower and the second buoy in sequence and is connected to the liftable ballast tank.

[0020] Furthermore, a guide ring is provided at the upper and lower ends of the inner side plate of the second pontoon. The upper guide ring is provided with eight sets of pins for locking the elevation of the lifting column, and the lower guide ring is provided with eight lateral supports for adjusting the center position of the lifting column.

[0021] Furthermore, the truss tower is sleeved 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 limiting supports and eight vertical limiting pins for locking the lifting column.

[0022] Furthermore, the height of the lifting column and the lifting wind turbine tower are the same, and the bottom of the lifting column is provided with a float for lifting the lifting wind turbine tower and the generator set installed on it.

[0023] Furthermore, the number of the multifunctional elastic mooring support beams is six, with each pair of multifunctional elastic mooring support beams respectively disposed on both sides of the first buoy. Each multifunctional elastic mooring support beam is provided with four to six guide holes, which are connected to the multifunctional elastic mooring support for supporting the multifunctional elastic mooring support.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The multifunctional caisson fixing foundation adopted in this utility model can provide a fixed hinge support for precise positioning of the tension tendon, enabling self-floating towing. It can be installed by venting and water injection, floated and moved by air injection and drainage, and the burial depth of the foundation structure into the seabed can be controlled by air lift and mud suction. Therefore, it can adapt to various seabed engineering geological conditions. Under the combined action of the foundation structure's own weight, iron ore ballast, and ballast water, it can withstand once-in-a-century waves and ocean current loads, so it can be installed at sea during typhoon season. Moreover, the foundation structure can be installed using a construction fleet mainly composed of ordinary tugboats and barges, thus significantly reducing the investment in installation projects.

[0026] The multi-functional elastic mooring tension leg adopted in this utility model can complete the assembly of tension tendons in a dry dock or anchorage and fix all tension leg fixing joints to the multi-functional caisson fixing foundation. All tension tendons can be readjusted for pretension after the installation of the multi-functional floating foundation structure is completed. Tension leg components can be removed or replaced during normal generator operation. The design, construction, installation, inspection and maintenance engineering investment of this type of tension leg is very low. Therefore, each tension leg platform can use more tension tendons, providing the multi-functional floating foundation structure with excellent technical performance such as good anti-collision performance, large pretension, small swing amplitude, and overall stability close to that of a deep-water jacket platform.

[0027] The multifunctional floating foundation adopted in this utility model consists of various deep-sea submersible buoys, ballast tanks, and lifting columns and lifting ballast tanks. The characteristics of this type of floating structure are: buoyancy is not affected by changes in wave crests and troughs; wave and current loads acting on the floating structure can generate sufficiently large anti-tipping and stability moments; the resultant force of wind, wave, and current loads can be controlled near the swing center of the floating foundation structure; the total center of gravity of the wind turbine and its supporting structure can be lowered 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.

[0028] This utility model adopts a combined design of lifting wind turbine tower and lifting column, which can lower the center of the wind turbine and its rotor to 40 to 50 meters above the sea level. Therefore, only large tugboats and crawler cranes are needed to complete the installation of the wind turbine and its rotor at sea, which can significantly reduce the investment in the maintenance of offshore wind turbines and their rotors. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0030] Figure 2 This is a schematic diagram of the multifunctional caisson fixing foundation structure of this utility model.

[0031] Figure 3 This is an exploded structural diagram of the multifunctional elastic mooring tension leg of this utility model.

[0032] Figure 4 This is a schematic diagram of the multifunctional floating foundation structure of this utility model.

[0033] Explanation of reference numerals in the attached drawings: 101. First ballast tank; 102. Cofferdam-type ballast tank; 103. Second ballast tank; 104. Tension leg fixed joint support beam; 105. Anti-sliding pile guide pipe; 106. High-pressure water jet tool guide hole; 107. Air lift mud suction tool guide hole;

[0034] 201. Multifunctional elastic mooring support; 202. Tension leg intermediate joint; 203. Self-floating mooring steel pipe; 204. Tension leg fixed joint;

[0035] 301. First pontoon; 302. Second pontoon; 303. Third ballast tank; 304. Third pontoon; 305. Truss tower; 306. Lifting ballast tank; 307. Lifting column; 308. Lifting wind turbine tower column; 309. Multifunctional flexible mooring support beam. Detailed Implementation

[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0037] Combination Figures 1 to 4 This utility model provides a multi-functional tension leg deep-water wind power platform, including a multi-functional caisson fixed foundation, a multi-functional elastic mooring tension leg, and a multi-functional floating foundation. The multi-functional elastic mooring tension leg is connected between the multi-functional caisson fixed foundation and the multi-functional floating foundation, with its lower end connected to the multi-functional caisson fixed foundation and its upper end connected to the multi-functional floating foundation.

[0038] Each platform is equipped with eighteen to thirty-six multi-functional elastic mooring tension legs. Each multi-functional elastic mooring tension leg includes a multi-functional elastic mooring support 201, four to five tension leg intermediate joints 202, three to four sections of self-floating mooring steel pipe 203, and a tension leg fixing joint 204. The multi-functional elastic mooring support 201 is located at the upper end of the multi-functional elastic mooring tension leg and is placed in the guide hole of the multi-functional elastic mooring support support beam 309 of the multi-functional floating foundation during the prefabrication stage. The tension leg intermediate joints 202 are used to connect the various components of each multi-functional elastic mooring tension leg into a whole. The self-floating mooring steel pipe 203 is connected to its adjacent upper and lower end components through the tension leg intermediate joints 202. The tension leg fixing joint 204 is located at the bottom end of the multi-functional elastic mooring tension leg and can be connected to the tension leg fixing joint support beam 104 of the multi-functional caisson fixing foundation through a pin.

[0039] In order to solve the problems of positioning error and high installation investment in existing tension leg platforms using distributed anchor piles, this utility model adopts the following... Figure 2 The multifunctional caisson fixing foundation design scheme is shown.

[0040] The multi-functional caisson fixing foundation includes a first ballast tank 101, a cofferdam-type ballast tank 102, a second ballast tank 103, and a tension leg fixing joint support beam 104. The first ballast tank 101 is used to store iron ore, the cofferdam-type ballast tank 102 is used to store the 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-type ballast tank 102 into an integral structure, and the tension leg fixing joint support beam 104 is installed on the first ballast tank 101.

[0041] Specifically, the first ballast tank 101 is a square ballast tank, the cofferdam-type ballast tank 102 is a hexagonal cofferdam-type ballast tank, and the second ballast tank 103 is a rectangular ballast tank. Each first ballast tank 101 has one air-lift mud suction tool guide hole 107 and eight high-pressure water jet tool guide holes 106 between its top and bottom plates. The cofferdam-type ballast tank 102 has nine anti-sliding pile guide pipes 105 and eighteen high-pressure water jet tool guide holes 106 between its top and bottom plates. Each second ballast tank 103 has three air-lift mud suction tool guide holes 107 and eight high-pressure water jet tool guide holes 106 between its top and bottom plates.

[0042] Preferably, the outer contour of the multi-functional caisson fixing 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 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.

[0043] Each multi-functional tension leg deep-water wind power platform is equipped with six tension leg fixed joint support beams 104. Every two tension leg fixed joint support beams 104 are respectively set on both sides of the first ballast tank 101. Each tension leg fixed joint support beam 104 is equipped with four to six fixed hinge supports, which are connected to the tension leg fixed joint 204 to provide precise positioning for the tension tendons.

[0044] The components of the aforementioned multifunctional caisson fixing foundation structure can be prefabricated in the factory and then assembled in a dry dock. It can precisely position the lower end fixing joint of the tension leg tendon within the dry dock, achieve self-floating towing, utilize venting and water injection methods for sinking and installation, combine air injection and drainage methods with air lift and mud suction to complete the foundation structure leveling work, control the depth of the foundation structure buried in the seabed using a combination of high-pressure water jetting and air lift and mud suction, adapt to various complex seabed engineering geological conditions, and rapidly complete offshore installation projects using equipment primarily composed of tugboats and crawler cranes.

[0045] To address several issues with existing tension leg platforms, including the limited number of available tension leg tendons, high installation technical difficulty, high installation investment, uneven pretension of tension tendons, and the inability to replace tension leg components after offshore installation, this utility model adopts the following approach... Figure 3 The multifunctional elastic mooring tension leg design scheme is shown.

[0046] The multi-functional elastic mooring tension leg includes eighteen to thirty-six tension tendons. Each tension tendon includes a multi-functional elastic mooring support 201, a tension leg intermediate joint 202, a multi-segment self-floating mooring steel pipe 203, and a tension leg fixing joint 204. The top end of the multi-functional elastic mooring support 201 is connected to the multi-functional elastic mooring support support beam 309 of the multi-functional 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 fixing joint 204 is connected to the tension leg fixing joint support beam 104 of the multi-functional caisson fixing foundation, and the top end is connected to the self-floating mooring steel pipe 203 located below through the tension leg intermediate joint 202.

[0047] Specifically, each tension tendon consists of a multi-functional elastic mooring support 201, three to four sections of self-floating mooring steel pipe 203 (or 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.

[0048] Using this method, all tension leg components can be assembled in a dry dock or at anchorage, and each tension leg fixing joint 204 can be secured to the multi-functional caisson foundation structure. During the water injection and sinking installation of the multi-functional caisson foundation structure, each tension rib can automatically float to an upright position. Therefore, it can reduce the amount of offshore installation work and save on installation investment. In addition, the pretension of the tension legs can be readjusted after the tension leg platform is installed, and the tension ribs can be replaced without affecting normal production.

[0049] To address the problems of existing tension unwinding platforms, such as high center of gravity of the floating structure, large overturning moment, and maximum working tension of the tension leg tendons potentially exceeding twice the average pretension while the minimum working tension may be less than zero, this utility model adopts... Figure 4 The multifunctional floating foundation design scheme is shown.

[0050] The multi-functional 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 column 308, and a multi-functional flexible mooring support beam 309. The second pontoon 302 is located at the center of the equilateral triangle formed by the three first pontoons 301. The third pontoon 304 is used to connect the first pontoons 301 and the second pontoons 302 into an integral structure. The third ballast tank 303 is connected between the first pontoons 301 and the second pontoons 302. The upper end of the liftable column 307 is connected to the liftable wind turbine tower column 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.

[0051] Specifically, the first pontoon 301 is a square pontoon, the second pontoon 302 is a hexagonal pontoon, the third ballast tank 303 is a rectangular ballast tank, the third pontoon 304 is a rectangular pontoon, the truss tower 305 is a hexagonal truss tower, and the lifting column 307 is a lifting pen-shaped column.

[0052] There are six multifunctional elastic mooring support beams 309. Every two multifunctional elastic mooring support beams 309 are respectively set on both sides of the first buoy 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 and are used to support the multifunctional elastic mooring support 201.

[0053] Preferably, the inner side plate of the second pontoon 302 is provided with a guide ring at the upper and lower ends. The upper guide ring is provided with eight sets of pins for locking the elevation of the lifting column 307, and the lower guide ring is provided with eight lateral supports for adjusting the center position of the lifting column 307.

[0054] Preferably, the truss tower 305 is fitted onto 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 limiting supports and eight vertical limiting pins for locking the lifting column 307.

[0055] Preferably, the height of the lifting column 307 and the lifting wind turbine tower 308 are the same. The bottom of the lifting column 307 is equipped with a float for lifting the lifting wind turbine tower 308 and the generator set installed on it.

[0056] Multiple pontoons and ballast tanks with top plates exceeding 15 meters in water depth are employed to avoid the impact of wave crests and troughs on the tension leg tendons. A combination of liftable column 307 and liftable ballast tanks is used to regulate the buoyancy center of gravity and gravity center of gravity of the floating foundation structure. The liftable ballast tanks have a diameter of 30 to 50 meters and a height of 8 to 12 meters. During the towing phase in port, these ballast tanks can provide 5,000 to 10,000 tons of net buoyancy to support the floating foundation structure and its wind turbine equipment. 5,000 to 10,000 tons of iron ore can be loaded into the ballast tanks before towing at sea. During the towing and installation phases at sea, venting and water injection methods can be used to lower the center of gravity of the floating structure and improve its floating stability.

[0057] During normal production operations, the aforementioned measures can be used to control the point of application of the resultant force of wind, wave, and current loads acting on the floating foundation structure to be near its oscillation center. This significantly reduces the overturning moment, effectively improves the motion performance of the floating foundation structure, and improves the stress conditions of the tension leg tendons.

[0058] In order to solve the engineering and technical challenges of replacing wind turbine generators and their rotors at sea, this utility model adopts... Figure 3 The conceptual design scheme and operation method of the lifting wind turbine tower 308 and lifting column 307 in the multi-functional floating foundation structure are shown. It is assumed that the height of the lifting wind turbine tower 308 is 120 to 140 meters, and the height of the lifting column 307 is also 120 to 140 meters, with a 30-meter-long pontoon placed inside the lifting column 307. During the replacement of the wind turbine generator and its rotor at sea, the upper part of the lifting wind turbine tower 308 can be lowered to 30 to 40 meters above sea level. Therefore, the task of replacing the wind turbine generator and its rotor can be completed at sea using large tugboats and crawler cranes.

[0059] Example 1

[0060] Examples of the conceptual design schemes for the multifunctional tension leg deep-water wind power platform disclosed in this utility model include: 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 column—six types of prefabricated structures.

[0061] The prefabricated components of the above six structures can be manufactured separately in different factories. They are then assembled in two groups within a dry dock exceeding 300 meters in length and 100 meters in width. The group closest to the dry dock entrance is the one used in this invention. Figure 2 and Figure 3 The multifunctional caisson fixing foundation structure and multifunctional elastic mooring tension legs shown are illustrated; another set is an appendix to this utility model. 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 assembled simultaneously in the rear of the dry dock.

[0062] The quantity, features, and main specifications of the various components are described below with reference to the accompanying drawings of this embodiment:

[0063] like Figure 2 As shown, the multi-functional caisson foundation structure has a total length of 80 to 100 meters and a total width of 100 to 125 meters. The quantity, dimensions, and main functions of its main prefabricated components are described below:

[0064] Three square ballast tanks, each with sides ranging from 16 to 20 meters and a height ranging from 18 to 26 meters. In this example, the three ballast tanks are empty during the towing process within the port. Once towed to the anchorage, they are filled with solid ballast material according to design requirements. After installation at sea, they are then filled with ballast water.

[0065] One equilateral hexagonal cofferdam-type ballast tank is constructed, with an inner side length of 8 to 12 meters, an outer side length of 16 to 20 meters, and a height of 8 to 12 meters. The inner side of this ballast tank serves as a sedimentation basin to collect sediment discharged from the foundation structure during installation. This example assumes favorable seabed geological conditions in the northern South China Sea at a depth of 120 to 200 meters; therefore, an equilateral hexagonal cofferdam structure is used. In actual engineering design, if the geological conditions are poor, an irregular hexagonal cofferdam structure can be used to obtain a larger sedimentation basin, providing greater anti-sliding capacity to the foundation structure.

[0066] There are three rectangular ballast water tanks, each ranging from 30 to 39 meters in length, 16 to 20 meters in width, and 8 to 12 meters in height. The bottom plate of the rectangular ballast water tanks is flush with the bottom plate of the hexagonal pontoon of component 302.

[0067] The tension leg fixed joint support beam consists of 6 pieces, each with a length of 6 to 8 meters and a width of 20 to 24 meters.

[0068] Nine anti-slide pile guide pipes. Diameter 3 to 4 meters, length 10 to 14 meters.

[0069] There are 66 prefabricated components for the high-pressure water jet tool guide holes, divided into two types. One type consists of 42 prefabricated components with a diameter of 2 meters and a length of 8 to 12 meters, which are located between the top and bottom plates of one cofferdam-type ballast tank and three rectangular ballast sections. The other type consists of 24 prefabricated components with a diameter of 2 meters and a length of 18 to 26 meters, which are divided into three groups and located between the top and bottom plates of three square ballast tanks.

[0070] There are 12 air-lift sludge suction tool guide holes, divided into two categories. The first category consists of 9 air-lift sludge suction tool guide holes with a diameter of 3 to 4 meters and a height of 10 to 12 meters, located between the top and bottom plates of the three rectangular ballast tanks. The second category consists of 3 air-lift sludge suction tool guide holes with a diameter of 3 to 4 meters and a height of 18 to 26 meters, located between the top and bottom plates of the three square ballast tanks.

[0071] like Figure 3 As shown, the main components and quantities of the multi-functional elastic mooring tension leg are as follows:

[0072] The system consists of 6 sets of multi-functional flexible mooring bearings, with 4 to 6 bearings per set. Each flexible bearing has an outer diameter of 2 to 3 meters and a design ultimate load capacity of 2,000 to 3,000 tons.

[0073] Tension leg intermediate joints, each tension leg uses 4 to 5 intermediate joints.

[0074] For self-floating mooring pipes designed for water depths of 120 to 300 meters, they can consist of three or four sections of self-floating mooring pipes. If the designed water depth exceeds 300 meters, each tension leg can consist of two to three sections of self-floating mooring pipes and one section of mooring cable or mooring rope.

[0075] Tension leg fixing joint, one fixing joint per leg.

[0076] like Figure 4 As shown, the names, quantities, and specifications of the prefabricated components for the multifunctional floating foundation structure are as follows:

[0077] Three square buoyancy tanks, each 20 meters on each side and 24 to 32 meters in height, will be determined based on iterative calculations of mooring forces. Each square buoyancy tank will have a 2-meter diameter watertight cover, a 3- to 5-meter diameter movable riser, and a temporary fixed flange on its top plate, providing a dry passage for annual inspections or maintenance. The distance from the center of each square buoy to the center of the floating foundation structure will be 50 to 60 meters.

[0078] The equilateral hexagonal floating box has an outer plate side length of 12 meters, an inner annular plate with an inner diameter of 12.1 meters to 14.1 meters, and a height of 20 meters. A guide ring is installed at both the top and bottom of the inner plate to define the position of the lower section of the lifting tower column. Eight sets of 0.2-meter diameter pins are installed on the upper guide ring of the inner plate to lock the elevation of the lower section of the tower column. Eight lateral supports are installed on the lower guide ring of the inner annular plate to adjust the center position of the lower section of the lifting tower column. The guide ring has an inner diameter of 12.1 meters to 14.1 meters, an outer diameter of 14 meters to 16 meters, and a height of 1 meter.

[0079] Three rectangular ballast water tanks, ranging from 30 to 39 meters in length, 16 to 20 meters in width, and 4 meters in height.

[0080] The rectangular floating box is 30 to 39 meters long, 16 to 20 meters wide, and 4 meters high.

[0081] One equilateral hexagonal truss tower, with sides ranging from 8 to 12 meters and a height of 24 meters. The upper plane of the hexagonal truss tower is equipped with 16 horizontal limiting supports and 8 vertical limiting pins for locking the lower section of component 307 lifting tower column.

[0082] One liftable ballast tank, with an outer plate diameter of 30 to 60 meters, an inner plate diameter of 12 to 14 meters, and a height of 10 meters. The inner plate needs to be welded and fixed to the lower section of component 307, the liftable tower column, in a dry dock to form a whole.

[0083] 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. Inside the lifting column, an olive-shaped pontoon with an outer diameter of 7.9 to 9.9 meters and a net buoyancy of 2,000 to 3,000 tons is installed for lifting and lowering the 308 lifting wind turbine tower and its turbine unit.

[0084] The tower of a retractable 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 rotor, is 2,000 to 3,000 tons.

[0085] The multi-functional flexible mooring bearing support beam consists of six sections, which are cantilever beams. Each section is 6 to 8 meters long, 20 to 24 meters wide, and 4 to 6 meters high. Each support beam section has 4 to 6 guide holes with a diameter of 3.01 meters to support 4 to 6 multi-functional flexible mooring bearings.

[0086] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A multifunctional tension leg deep-water wind power platform, characterized in that, It includes a multi-functional caisson fixing foundation, a multi-functional elastic mooring tension leg, and a multi-functional floating foundation. The multi-functional elastic mooring tension leg is connected between the multi-functional caisson fixing foundation and the multi-functional floating foundation, with its lower end connected to the multi-functional caisson fixing foundation and its upper end connected to the multi-functional floating foundation. Each platform is equipped with eighteen to thirty-six multi-functional elastic mooring tension legs. Each multi-functional elastic mooring tension leg includes a multi-functional elastic mooring support (201), four to five tension leg intermediate joints (202), three to four sections of self-floating mooring steel pipe (203), and a tension leg fixing joint (204). The multi-functional elastic mooring support (201) is located at the upper end of the multi-functional elastic mooring tension leg and is placed in the guide hole of the multi-functional elastic mooring support support beam (309) of the multi-functional floating foundation during the prefabrication stage. The tension leg intermediate joint (202) is used to connect the various components of each multi-functional elastic mooring tension leg into a whole. 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 fixing joint (204) is located at the bottom end of the multi-functional elastic mooring tension leg and can be connected to the tension leg fixing joint support beam (104) of the multi-functional caisson fixing foundation through a pin.

2. The multifunctional tension leg deep-water wind power platform as described in claim 1, characterized in that, The multi-functional caisson fixing foundation includes a first ballast tank (101), a cofferdam-type ballast tank (102), a second ballast tank (103), and a tension leg fixing joint support beam (104). The first ballast tank (101) is used to store iron ore, the cofferdam-type ballast tank (102) is used to store silt discharged from the foundation, the second ballast tank (103) is used to connect the first ballast tank (101) and the cofferdam-type ballast tank (102) into an integral structure, and the tension leg fixing joint support beam (104) is installed on the first ballast tank (101).

3. The multifunctional tension leg deep-water wind power platform as described in claim 2, characterized in that, The outer contour of the multi-functional caisson fixing 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 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. A multi-functional tension leg deep-water wind power platform as described in claim 2, characterized in that, Each platform is provided with six sections of tension leg fixed joint support beams (104). Every two sections of tension leg fixed joint support beams (104) are respectively located on both sides of the first ballast tank (101). Each section of tension leg fixed joint support beams (104) is provided with four to six fixed hinge supports. The fixed hinge supports are connected to the tension leg fixed joints (204) to provide precise positioning for the tension tendons.

5. A multi-functional tension leg deep-water wind power platform as described in claim 2, characterized in that, Each of the first ballast tanks (101) has one air-lift mud suction tool guide hole (107) and eight high-pressure water jet tool guide holes (106) between its top plate and bottom plate. The cofferdam-type ballast tank (102) has nine anti-sliding pile guide pipes (105) and eighteen high-pressure water jet tool guide holes (106) between its top plate and bottom plate. Each of the second ballast tanks (103) has three air-lift mud suction tool guide holes (107) and eight high-pressure water jet tool guide holes (106) between its top plate and bottom plate.

6. A multi-functional tension leg deep-water wind power platform as described in claim 1, characterized in that, 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 column (308), and a multifunctional flexible mooring support beam (309). The second pontoon (302) is located at the center of the equilateral triangle formed by the three first pontoons (301). The third pontoon (304) is used to connect the first pontoons (301) and the second pontoons (302) into an integral structure. The third ballast tank (303) is connected between the first pontoons (301) and the second pontoons (302). The upper end of the liftable column (307) is connected to the liftable wind turbine tower column (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. A multifunctional tension leg deep-water wind power platform as described in claim 6, characterized in that, The inner side plate of the second float box (302) is provided with a guide ring at the upper and lower ends. The upper guide ring is provided with eight sets of pins for locking the elevation of the lifting column (307), and the lower guide ring is provided with eight lateral supports for adjusting the center position of the lifting column (307).

8. A multi-functional tension leg deep-water wind power platform as described in 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). The top surface of the truss tower (305) is provided with sixteen horizontal limiting supports and eight vertical limiting pins for locking the lifting column (307).

9. A multifunctional tension leg deep-water wind power platform as described in claim 6, characterized in that, The height of the lifting column (307) and the lifting wind turbine tower (308) are the same. The bottom of the lifting column (307) is provided with a float for lifting the lifting wind turbine tower (308) and the generator set installed on it.

10. A multifunctional tension leg deep-water wind power platform as described in claim 6, characterized in that, The number of the multifunctional elastic mooring support beams (309) is six. Each pair of multifunctional elastic mooring support beams (309) is respectively arranged on both sides of the first buoy (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) and are used to support the multifunctional elastic mooring support (201).

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