Multi-tripod type concrete-filled steel tube mixing composite pile foundation for offshore wind power

Abstract

The utility model relates to the technical field of offshore wind power foundations, in particular to a multi-foot stool type concrete-filled steel tube mixing composite pile foundation for offshore wind power, which comprises a multi-foot stool and a plurality of concrete-filled steel tube mixing composite piles arranged at the bottom of the multi-foot stool, and offshore wind power equipment is connected and supported above the multi-foot stool; the multiple concrete-filled steel tube mixing composite piles are vertically arranged below the multi-foot frame, the bottoms of the concrete-filled steel tube mixing composite piles are inserted into a seabed soil layer, and the parts, inserted into the seabed soil layer, of the concrete-filled steel tube mixing composite piles comprise mixing piles and concrete-filled steel tube piles from outside to inside. The steel pipe concrete pile is composed of a steel pipe and concrete poured into the steel pipe. The utility model has the advantages that: 1) the structure stress is reasonable, the foundation cost and construction difficulty are reduced, 2) the corrosion resistance of the foundation is improved, 3) the anti-fatigue performance is good, 4) the service life of the foundation is prolonged, 5) the impact resistance of the structure is strong, 6) the structure rigidity is large, the stability is strong, and the applicable seawater depth is large.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power foundations, in particular to a multi-pod type steel tube concrete mixing composite pile foundation for offshore wind power. Background Art

[0002] Offshore wind power foundation has always been the focus and difficulty of offshore wind power projects. There are eight main types of offshore wind power foundation structures, namely single pile foundation, high pile foundation, conductor frame foundation, gravity foundation, tripod foundation, as well as bucket type, floating foundation and suction foundation. The most commonly used in China today are steel pipe pile single pile or high pile foundation.

[0003] Due to the large wind load at sea, these two types of foundation steel pipe piles are relatively large, that is, the diameter and pile length are large. The maximum diameter of the steel pipe pile can reach 10m, the pile length is tens of meters to nearly 100 meters, and the weight is more than 1,000 tons. In addition, the construction site is located at sea. The huge steel pipe piles have caused great difficulties in marine transportation, lifting, piling, and other construction processes, and the cost is high. In the marine environment, the corrosion protection of steel pipes is also a very difficult problem to deal with. Summary of the invention

[0004] The purpose of the utility model is to provide a multi-legged steel tube concrete mixing composite pile foundation for offshore wind power generation based on the above-mentioned deficiencies of the prior art. The composite pile provides friction for the internal steel tube concrete pile by the outer mixing cement soil pile in the seabed soil layer. Due to the restraining effect of the steel tube, the concrete in the steel tube is in a three-dimensional force state, and the bearing capacity of the pile body is greatly improved compared with that of general concrete or pure steel tube. At the same time, its overall rigidity, bending resistance and impact resistance are greatly improved, and the cross-sectional size of the steel tube can be greatly reduced, which brings great convenience to the transportation and hoisting of pile foundation materials, saves the process of piling, and can greatly reduce the material cost and construction cost of the pile foundation. At the same time, under the protection of the internal concrete and the external mixing pile cement soil, the corrosion resistance of the steel tube in the composite pile foundation is also greatly improved, and the cyclic load fatigue resistance of the steel tube concrete structure is significantly improved compared with the hollow steel tube structure, so that the design life of the pile foundation can be significantly increased; the steel tube concrete structure has large rigidity, so that its foundation can be suitable for deeper sea areas; compared with the traditional offshore wind power foundation, it has obvious technical and economic advantages.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A multi-pod steel tube concrete mixing composite pile foundation for offshore wind power, used for supporting offshore wind power equipment, wherein the offshore wind power equipment comprises a wind turbine set, a wind turbine blade and a tower, and is characterized in that: the foundation comprises a multi-pod and a plurality of steel tube concrete mixing composite piles arranged at the bottom thereof, wherein the upper portion of the multi-pod is connected to support the offshore wind power equipment; the plurality of steel tube concrete mixing composite piles are respectively arranged vertically below the multi-pod, wherein the bottom of the steel tube concrete mixing composite pile is inserted into the seabed soil layer, and the portion inserted into the seabed soil layer comprises, from the outside to the inside, a mixing pile and a steel tube concrete pile, wherein the steel tube concrete pile is composed of a steel pipe and concrete poured inside the steel tube concrete pile.

[0007] The portion of the steel tube concrete mixing composite pile located in the seawater between the sea surface and the seabed is a steel tube concrete pile.

[0008] The multi-legged stand has supporting legs corresponding to the number of the steel tube concrete mixing composite piles, and the steel tube concrete piles of each steel tube concrete mixing composite pile are connected to each supporting leg in a one-to-one correspondence.

[0009] The multi-legged stand is a tripod.

[0010] The advantages of the utility model are:

[0011] 1) Reasonable structural stress, reducing foundation cost and construction difficulty: Steel tube concrete mixing composite piles are provided with friction by external large-diameter mixing piles, and internal steel tube concrete piles provide pile body bearing capacity; Steel tube concrete piles, due to the restraining effect of the steel tube, make the concrete in the steel tube in a three-dimensional stress state, and its pile body bearing capacity is greatly improved compared with general concrete or pure steel tube piles. When bearing the same load, the diameter of the steel tube can be greatly reduced, reducing the material cost of the pile foundation; At the same time, it can also be constructed in sections, compared with the conventional large-diameter long steel tube piles of offshore wind power foundations, the cost of offshore transportation and hoisting is greatly reduced; At the same time, the pile foundation adopts the mixing and sinking process, and does not require offshore piling, which greatly reduces the difficulty and cost of pile sinking; This type of pile effectively reduces the cost in terms of materials, offshore transportation, hoisting, piling, etc., and the comprehensive cost has obvious advantages over conventional steel tube pile foundations.

[0012] 2) Improve the corrosion resistance of the foundation: Steel tube concrete mixing composite piles, with the steel tube wrapped in concrete inside the tube and cement soil outside the tube, greatly improve its corrosion resistance in the marine environment.

[0013] 3) Good fatigue resistance: Compared with pure steel pipe pile structure, steel tube concrete structure has obvious advantages in fatigue resistance under cyclic load, which can significantly improve the foundation's ability to resist structural fatigue.

[0014] 4) Improve the service life of the foundation: Corrosion resistance and structural fatigue resistance are key factors affecting the service life of offshore wind power foundations. Due to the high corrosiveness of seawater, the current hollow steel pipe piles are severely corroded. At the same time, the long-term vibration load, waves, sea ice, and sea wind during the operation of wind turbines cause the foundation to bear a large cyclic load. The current design life of offshore wind power foundations is generally 25-30 years. The steel tube concrete mixing composite pile structure has significantly enhanced corrosion resistance and structural fatigue resistance, which can effectively extend the service life of the offshore wind power foundation, increase its power generation during its service life, and thus reduce the comprehensive cost of offshore wind power per kilowatt-hour.

[0015] 5) Strong structural impact resistance: Compared with hollow steel tube structures, steel tube concrete structures have greatly improved impact resistance and bending resistance due to the presence of solid concrete inside. They can effectively resist the impact of harsh external conditions such as waves, tides, sea ice, and sea breezes.

[0016] 6) High structural rigidity, strong stability, and applicable to large seawater depth: The CFST column has high structural rigidity and is an integrated structure with the CFST mixed composite pile below the seabed. Its overall stability is significantly improved compared to the hollow steel tube high pile cap foundation. At the same time, since the CFST column has good circumferential compressive strength, it greatly increases the water depth of fixed foundations for offshore wind power, creating technical conditions for offshore wind power to move to the deep sea. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a detailed schematic diagram of the utility model;

[0019] Figure 3 It is a schematic diagram of the end portion of the utility model;

[0020] Figure 4 It is a cross-sectional schematic diagram of the composite pile in the utility model. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0022] like Figure 1-4 As shown, the marks 1-10 in the figure respectively represent: wind turbine set 1, wind turbine blade 2, tower 3, steel tripod 4, steel tube concrete pile 5, steel tube concrete mixing composite pile 6, concrete 7, steel tube 8, mixing pile cement soil 9, and mixing head 10.

[0023] Example: Figures 1 to 4As shown, in this embodiment, the multi-pod steel tube concrete mixing composite pile foundation for offshore wind power is used to support offshore wind power equipment, and the offshore wind power equipment includes a wind turbine group 1, a wind turbine blade 2 and a tower 3, wherein the wind turbine blade 2 is installed on the wind turbine group 1 to collect wind energy, and the wind turbine group 1 is used to convert wind energy into electrical energy, and the tower 3 is arranged below the wind turbine group 1.

[0024] Specifically, combined Figures 1 to 4 As shown, the main body of the multi-pod steel tube concrete mixing composite pile foundation for offshore wind power in this embodiment includes a steel tripod 4 and a plurality of steel tube concrete mixing composite piles 6, wherein the plurality of steel tube concrete mixing composite piles 6 are arranged at the lower part of the steel tripod 4 and each steel tube concrete mixing composite pile 6 is arranged vertically to effectively support the steel tripod 4, and the tower 3 is supported above the steel tripod 4. In this embodiment, the steel tripod 4 has three symmetrically arranged legs, and each leg is connected to a corresponding steel tube concrete pile 5 of the steel tube concrete mixing composite pile 6.

[0025] In this embodiment, the pile foundation located at the bottom of the steel tripod 4 includes a steel tube concrete pile 5 and a steel tube concrete mixing composite pile 6, wherein the steel tube concrete pile 5 is located in the sea water between the sea surface and the seabed, and it serves as the core pile part of the steel tube concrete mixing composite pile 6, and the steel tube concrete mixing composite pile 6 is inserted into the seabed soil layer, which includes the steel tube concrete pile 5 and the mixing pile cement soil 9 (mixing pile) composite pile.

[0026] Specifically, the steel tube concrete pile 5 includes a steel tube 8 and concrete 7 poured inside it. Due to the restraining effect of the steel tube 8, the concrete 7 is in a three-dimensional stress state; the steel tube concrete mixing composite pile 6 is provided with friction force by the outer mixing pile cement soil 9 for the inner steel tube concrete pile 5 in the seabed soil layer, and its pile body bearing capacity is greatly improved, and its overall rigidity, bending resistance, and impact resistance are greatly improved, which can greatly reduce the cross-sectional size of the steel tube, bring great convenience to the transportation and hoisting of the pile foundation materials, and save the process of piling, which can greatly reduce the material cost and construction cost of the pile foundation. At the same time, the steel tube 8 of the steel tube concrete mixing composite pile 6 located in the seabed soil layer is protected by the internal concrete 7 and the external mixing pile cement soil 9, and the anti-corrosion ability is also greatly improved, and the fatigue resistance of the steel tube concrete structure is also significantly improved compared with the pure steel structure, which can effectively improve the service life of the offshore wind power foundation.

[0027] like Figure 3 As shown, in this embodiment, during the construction of the cement-soil mixing pile 9, the cement slurry is fully mixed with the soil of the seabed soil layer through the mixing head 10 to form cement-soil.

[0028] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A multi-legged steel tube concrete mixing composite pile foundation for offshore wind power, used to support offshore wind power equipment, the offshore wind power equipment includes a wind turbine set, wind turbine blades and a tower, characterized in that: The foundation includes a multi-pod and a plurality of steel tube concrete mixing composite piles arranged at the bottom thereof, wherein the upper portion of the multi-pod is connected to support the offshore wind power equipment; the plurality of steel tube concrete mixing composite piles are vertically arranged below the multi-pod, wherein the bottom of the steel tube concrete mixing composite pile is inserted into the seabed soil layer, and the portion inserted into the seabed soil layer includes mixing piles and steel tube concrete piles from the outside to the inside, wherein the steel tube concrete piles are composed of steel pipes and concrete poured inside.

2. A multi-pod steel tube concrete mixing composite pile foundation for offshore wind power according to claim 1, characterized in that: The portion of the steel tube concrete mixing composite pile located in the seawater between the sea surface and the seabed is a steel tube concrete pile.

3. The multi-pod steel tube concrete mixing composite pile foundation for offshore wind power according to claim 1, characterized in that: The multi-legged stand has supporting legs corresponding to the number of the steel tube concrete mixing composite piles, and the steel tube concrete piles of each steel tube concrete mixing composite pile are connected to each supporting leg in a one-to-one correspondence.

4. The multi-pod steel tube concrete mixing composite pile foundation for offshore wind power according to claim 1, characterized in that: The multi-legged stand is a tripod.

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