Fan combined structure and method of gravity type foundation and steel pipe pile

Abstract

The invention discloses a gravity type foundation and steel pipe pile fan combination structure and method, and belongs to the technical field of offshore wind power engineering.The combination structure comprises a circular ring and cone assembly, the circular ring and cone assembly is provided with an insertion hole, the circular ring and cone assembly allows a steel pipe pile to penetrate through the insertion hole for pile sinking, and the circular ring and cone assembly is provided with a guide assembly; the gravity type foundation is used for guiding the steel pipe pile to penetrate through the circular ring and cone assembly, and after the steel pipe pile enters a surface soil body by a certain depth through the self weight, the steel pipe pile is assisted to stand, and the invention further discloses a fan combination method of the gravity type foundation and the steel pipe pile. According to the combined fan foundation with the single steel pipe pile and the gravity type foundation, counter force is not provided only by soil around the steel pipe pile, but the steel pipe pile and the circular ring and cone assembly form a whole in a concrete pouring mode, the environment force is jointly resisted, the whole upper structure is supported, and the length of the steel pipe pile can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power engineering, and in particular relates to a wind turbine combination structure of a gravity foundation and steel pipe piles and a method. Background Art

[0002] In recent years, as the country continues to strengthen its support for new energy and the concept of green development has become more in-depth, offshore wind energy resources have received increasing attention. Compared with traditional energy, wind energy is a clean renewable energy source with no environmental costs such as carbon emissions and no fuel risks. With the development of society, wind power has gradually become an important part of the sustainable development strategy of many countries. my country's offshore wind energy resources are very rich. Vigorously developing offshore wind energy is of great strategic significance for improving my country's energy structure, saving land, and achieving sustainable economic and social development.

[0003] As wind turbine foundations are deployed further out to sea, the distance from shore and the water depth also increase. The load and bending moment borne by offshore wind turbine foundations increase significantly, especially for high-power wind turbine equipment. Conventional wind turbine foundations find it difficult to withstand such huge loads. Traditional offshore wind turbine single pile foundations usually need to increase the pile diameter and pile length to meet design requirements. When considering scouring conditions, the penetration depth of the single pile foundation will increase to offset the adverse effects of scouring. Although increasing the diameter, length and wall thickness of the single pile foundation can significantly improve the bearing capacity and stiffness of the foundation, it will significantly increase the use of steel, resulting in further increases in production costs, transportation costs and installation costs.

[0004] In most coastal waters of my country, the physical and mechanical indicators of the shallow seabed soil layer are poor and often cannot directly meet the design requirements. Moreover, with the increase of offshore distance and water depth, the marine engineering environment becomes more severe, and the requirements for various aspects of wind turbine foundations are further increased.

[0005] Therefore, it is urgent to design a wind turbine combination structure and method of a gravity foundation and steel pipe piles to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a wind turbine combination structure and method of a gravity foundation and steel pipe piles, which has the advantages of being able to meet the design requirements of offshore wind power foundations, facilitating the construction of offshore wind power foundations, and solving the problems mentioned in the background technology.

[0007] To achieve the above purpose, the specific technical scheme of the wind turbine combination structure and method of the gravity foundation and steel pipe pile of the present invention is as follows: A wind turbine combination structure of a gravity foundation and steel pipe piles comprises a ring cone assembly, the ring cone assembly is provided with an insertion hole, the ring cone assembly allows the steel pipe piles to pass through the insertion hole for sinking, and the ring cone assembly is provided with a guide assembly to guide the steel pipe piles to pass through the ring cone assembly, and assist the steel pipe piles to stand after the steel pipe piles enter the surface soil to a certain depth under their own weight.

[0008] Furthermore, the annular cone assembly comprises a first annular cone, a second annular cone and a third annular cone, the first annular cone, the second annular cone and the third annular cone are sequentially sleeved from outside to inside, and the insertion hole is arranged on the third annular cone.

[0009] Furthermore, the bottom ends of the first annular cone, the second annular cone and the third annular cone are all connected with a serrated ring plate.

[0010] Furthermore, the first ring cone, the second ring cone and the third ring cone are located at the same center of a circle, a first filling gap is provided between the first ring cone and the second ring cone, a second filling gap is provided between the second ring cone and the third ring cone, and after the steel pipe pile passes through the insertion hole, a third filling gap is provided between the third ring cone and the steel pipe pile, and the first filling gap, the second filling gap and the third filling gap are provided for pouring concrete for fixing.

[0011] Furthermore, the first ring cone, the second ring cone and the third ring cone are all provided with lifting ears, which can be hooked with the lifting hook of the lifting device through the lifting ears.

[0012] Furthermore, the guide assembly includes a first guide ring and a second guide ring, the first guide ring and the second guide ring are respectively located at two ends of the annular cone assembly, and the first guide ring and the second guide ring coincide with the insertion hole.

[0013] Furthermore, the first guide ring and the second guide ring are connected to the ring-cone assembly through a guide bracket.

[0014] Furthermore, the guiding assembly also includes a guiding bell mouth, which is located at the top of the annular cone and is connected to the annular cone assembly.

[0015] Furthermore, the guide bell mouth is connected to the ring cone assembly through a bell mouth bracket.

[0016] A method for combining a gravity foundation and a wind turbine with steel pipe piles, combining the above-mentioned gravity foundation and wind turbine combination structure with steel pipe piles, comprising the following steps: S1. Place the third ring cone on the seabed at a designated location by means of a lifting device; S2, using a sling to put the second ring cone on the outside of the third ring cone, leaving a second filling gap; S3, using a sling to put the first circular cone on the outside of the second circular cone, leaving a first filling gap; S4. Lift the steel pipe pile by a lifting device and slowly place it vertically into the water. The steel pipe pile first passes through the guide bell mouth, then passes through the first guide ring and the second guide ring, and enters the soil to a certain depth by its own weight, leaving a third filling gap. S5. Use the piling equipment to drive the steel pipe piles into the soil to the required depth; S6. After the pile driving construction is completed, pour concrete in all the gaps from the inside to the outside to form a whole.

[0017] The present invention has the following advantages: the present invention uses a combined wind turbine foundation of a single steel pipe pile and a gravity foundation, and no longer relies solely on the soil around the steel pipe pile to provide reaction force, but instead forms the steel pipe pile and the annular cone assembly into a whole by pouring concrete, which jointly resist environmental forces and support the entire upper structure, thereby effectively reducing the length of the steel pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the composite structure of the present invention after pouring concrete; Figure 2 This is a schematic diagram of the structure of the combined structure of the present invention before the steel pipe piles are inserted; Figure 3 It is a schematic structural diagram of the third ring cone of the present invention; Figure 4 It is a schematic structural diagram of the second annular cone of the present invention; Figure 5 It is a schematic structural diagram of the first ring cone of the present invention; Explanation of the markings in the figure: 1. Ring cone assembly; 11. First ring cone; 12. Second ring cone; 13. Third ring cone; 14. First filling gap; 15. Second filling gap; 16. Third filling gap; 2. Steel pipe pile; 3. Lifting ear; 4. Guide assembly; 41. First guide ring; 42. Second guide ring; 43. Guide bracket; 44. Guide bell; 45. Bell bracket; 5. Serrated ring plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0021] Please refer to the attached Figure 1 To Attachment Figure 5 The invention describes a wind turbine assembly structure of a gravity foundation and steel pipe piles and a method thereof.

[0022] At present, as wind power foundations are deployed deep into the sea, the offshore distance and water depth also increase. The load and bending moment borne by the offshore wind power foundation increase significantly, especially for high-power wind turbine equipment. Conventional wind turbine foundations are difficult to withstand such huge loads. Traditional offshore wind power single pile foundations usually need to increase the pile diameter and pile length to meet design requirements. When considering scouring conditions, the penetration depth of the single pile foundation will increase to offset the adverse effects of scouring. Although increasing the diameter, length and wall thickness of the single pile foundation can significantly improve the bearing capacity and stiffness of the foundation, it will significantly increase the use of steel, resulting in further increases in production costs, transportation costs and installation costs.

[0023] Therefore, we need to solve: (1) The steel pipe piles penetrate deep and are heavy; (2) Offshore steel pipe pile construction relies on a pile stabilization platform; (3) It is not applicable to deep waters; (4) Scouring has a significant adverse effect on the foundation; (5) High reliance on large-scale machinery and tools; (6) The steel consumption is large and the costs are high.

[0024] Therefore, the wind turbine combination structure of the gravity foundation and steel pipe piles includes a ring cone component 1, which is provided with an insertion hole, and the ring cone component 1 allows the steel pipe pile 2 to pass through the insertion hole. A guide component 4 is provided on the ring cone component 1 to guide the steel pipe pile 2 to pass through the ring cone component 1, and after the steel pipe pile 2 enters a certain depth of the surface soil under its own weight, the steel pipe pile 2 is assisted to stand.

[0025] The wind turbine foundation of the present invention uses a combined wind turbine foundation of a single steel pipe pile 2 and a gravity foundation. Instead of relying solely on the soil around the steel pipe pile 2 to provide reaction force, the steel pipe pile 2 and all the circular cones are formed into a whole by pouring concrete to jointly resist environmental forces and support the entire upper structure, thereby effectively reducing the length of the steel pipe pile 2.

[0026] In addition, the present invention uses the steel pipe piles 2 to bear the vertical load and lateral bending moment of the upper wind turbine while also bearing the environmental load, and transfers all loads to the lower soil and the gravity foundation, which share the loads. The lower soil can resist the vertical load and a part of the lateral bending moment and the environmental load, and the remaining loads are borne by the gravity foundation. The gravity foundation can not only resist the environmental load it is subjected to, but also reasonably transfer the above loads to the foundation bearing layer, thereby providing effective lateral support for the entire structure.

[0027] And by setting up a guiding component 4 to guide the steel pipe pile 2 into the annular cone component 1, when the steel pipe pile 2 enters the surface soil to a certain depth by its own weight, the steel pipe pile 2 can be assisted to stand freely, and the verticality of the steel pipe pile 2 can be controlled to meet the pile sinking requirements, and the lateral support can be strengthened, which is equivalent to a pile stabilizing bracket. This not only omits the layout and folding of the pile stabilizing platform, but also greatly reduces the time of offshore pile sinking construction.

[0028] At the same time, since the pile length and other factors are reduced to varying degrees in the present invention, the consumption of steel can be effectively reduced, and its production cost, transportation cost, installation cost, etc. are also significantly reduced. The penetration depth of the steel pipe pile 2 is relatively small, and the provision of a guide ring and a guide bell mouth 44 can facilitate construction, which can greatly reduce the offshore operation time, thereby improving construction efficiency, reducing construction risks, and improving economy.

[0029] Furthermore, the ring cone assembly 1 includes a first ring cone 11, a second ring cone 12 and a third ring cone 13, and the first ring cone 11, the second ring cone 12 and the third ring cone 13 are sequentially connected from the outside to the inside, and the insertion hole is provided on the third ring cone 13; by providing the first ring cone 11, the second ring cone 12 and the third ring cone 13, the single body weight of each ring cone is not large, and the construction can be carried out after being lifted separately, which can reduce the rated usage of the floating crane and the specifications of related offshore construction equipment, and can achieve the purpose of reducing dependence on large-scale machinery and tools. At the same time, the steel pipe pile 2 is inserted into the innermost third ring cone 13, so that the steel pipe pile 2 is not affected by scouring, and the diameter of the first ring cone 11 located at the outermost layer is larger, which can effectively reduce the adverse effects of scouring on the overall structure. If the seawater flow rate is fast and the scouring is serious, it can also be considered to increase the penetration depth of the steel pipe pile 2 and increase the number of ring cones.

[0030] Preferably, when the steel pipe pile 2 is penetrated, the steel pipe pile 2 and the first annular cone 11 , the second annular cone 12 and the third annular cone 13 are located at the same axis.

[0031] Specifically, the bottom ends of the first ring cone 11, the second ring cone 12 and the third ring cone 13 are all connected with a serrated ring plate 5. By arranging the serrated ring plate 5 on each ring cone, when the ring cone is placed on the seabed at a specified position, the serrated ring plate 5 enters the surface soil at a certain depth, which can improve the anti-overturning and anti-slip stability, reduce the adverse effects of scouring, the steel pipe pile 2 has a less penetration depth, and the guide ring and the guide port are more convenient for construction, which can greatly reduce the offshore operation time.

[0032] Specifically, the first ring cone 11, the second ring cone 12 and the third ring cone 13 are located at the same center of a circle, a first filling gap 14 is provided between the first ring cone 11 and the second ring cone 12, a second filling gap 15 is provided between the second ring cone 12 and the third ring cone 13, and after the steel pipe pile 2 passes through the insertion hole, a third filling gap 16 is provided between the third ring cone 13 and the steel pipe pile 2, and the first filling gap 14, the second filling gap 15 and the third filling gap 16 are used for pouring concrete for fixing; after the pile driving construction is completed, all the gaps are poured with concrete in order from the inside to the outside, that is, the third filling gap 16, the second filling gap 15, and the first filling gap 14 are poured in sequence to form a whole.

[0033] Furthermore, the first ring cone 11, the second ring cone 12 and the third ring cone 13 are all provided with lifting ears 3, which can be hooked with the hook of the lifting device. By providing the lifting ears 3 on each ring cone, it is convenient for the lifting device to lift each ring cone.

[0034] Furthermore, the guide assembly 4 includes a first guide ring 41 and a second guide ring 42, and the first guide ring 41 and the second guide ring 42 are respectively located at the two ends of the ring cone assembly 1, and the first guide ring 41 and the second guide ring 42 coincide with the insertion hole. Through the first guide ring 41 and the second guide ring 42, when the steel pipe pile 2 enters the surface soil to a certain depth by its own weight, the steel pipe pile 2 can be assisted to stand freely, and the verticality of the steel pipe pile 2 can be controlled to meet the pile driving requirements, and the lateral support can be strengthened, which is equivalent to a pile stabilizing bracket. This not only omits the layout and folding of the pile stabilizing platform, but also greatly reduces the time of offshore pile driving construction.

[0035] Preferably, the first guide ring 41 and the second guide ring 42 are connected to the ring-cone assembly 1 via a guide bracket 43. The guide bracket 43 is provided to support the first guide ring 41 and the second guide ring 42. In other embodiments of the present invention, the guide rings may also be connected via other components as long as the guide rings can be fixed.

[0036] Furthermore, the guide component 4 also includes a guide bell mouth 44, which is located at the top of the annular cone and is connected to the annular cone component 1. By setting the guide bell mouth 44, the steel pipe pile 2 can be guided into the insertion hole of the third annular cone 13. When the steel pipe pile 2 enters the surface soil to a certain depth by its own weight, the steel pipe pile 2 can be assisted to stand freely, and the verticality of the steel pipe pile 2 can be controlled to meet the pile sinking requirements, and the lateral support can be strengthened, which is equivalent to a pile stabilizing bracket. This not only omits the layout and folding of the pile stabilizing platform, but also greatly reduces the time of offshore pile sinking construction.

[0037] Preferably, the guide bell mouth 44 is connected to the annular cone assembly 1 through a bell mouth bracket 45. The bell mouth bracket 45 is provided to support the guide bell mouth 44. In other embodiments of the present invention, the guide bell mouth 44 can also be connected through other components as long as the guide bell mouth 44 can be fixed.

[0038] A method for combining a gravity foundation and a wind turbine with a steel pipe pile 2, combining the above-mentioned gravity foundation and a wind turbine combination structure with a steel pipe pile 2, comprising the following steps: S1, placing the third ring cone 13 on the seabed at a designated position by means of a lifting device; S2, using a sling to put the second ring cone 12 on the outside of the third ring cone 13, leaving a second filling gap 15; S3, using a sling to put the first ring cone 11 on the outside of the second ring cone 12, leaving a first filling gap 14; S4, lift the steel pipe pile 2 by the lifting device, and slowly put it vertically into the water, the steel pipe pile 2 first passes through the guide bell mouth 44, then passes through the first guide ring 41 and the second guide ring 42, and enters the soil to a certain depth by relying on the deadweight of the steel pipe pile 2, and leaves a third filling gap 16; S5, using the piling equipment to penetrate the steel pipe pile 2 into the soil to the required design depth; S6. After the pile driving construction is completed, pour concrete in all the gaps from the inside to the outside to form a whole.

[0039] This combination method can be applied to waters with relatively deep waters, and can significantly reduce the penetration depth of the steel pipe piles 2 into the soil. The center of gravity of the entire structure is lowered, and the bottom serrated ring plate 5 enters the surface soil at a certain depth, which can improve the anti-overturning and anti-slip stability and reduce the adverse effects of scouring. The penetration depth of the steel pipe piles 2 is relatively small, and the guide rings and guide ports are more convenient for construction, which can greatly reduce the offshore operation time.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A wind turbine combination structure of a gravity foundation and steel pipe piles, characterized in that: It includes a ring cone component, which is provided with an insertion hole, through which a steel pipe pile is passed through the ring cone component for sinking. A guide component is provided on the ring cone component to guide the steel pipe pile to pass through the ring cone component, and after the steel pipe pile enters a certain depth of the surface soil under its own weight, the steel pipe pile is assisted to stand.

2. The wind turbine combination structure of gravity foundation and steel pipe pile according to claim 1 is characterized in that: The annular cone assembly comprises a first annular cone, a second annular cone and a third annular cone. The first annular cone, the second annular cone and the third annular cone are sleeved in sequence from outside to inside, and the insertion hole is arranged on the third annular cone.

3. The wind turbine combination structure of gravity foundation and steel pipe pile according to claim 2 is characterized in that: The bottom ends of the first annular cone, the second annular cone and the third annular cone are all connected with a serrated ring plate.

4. The wind turbine combination structure of gravity foundation and steel pipe pile according to claim 2, characterized in that: The first ring cone, the second ring cone and the third ring cone are located at the same center of a circle, a first filling gap is provided between the first ring cone and the second ring cone, a second filling gap is provided between the second ring cone and the third ring cone, and after the steel pipe pile passes through the insertion hole, a third filling gap is provided between the third ring cone and the steel pipe pile, and the first filling gap, the second filling gap and the third filling gap are provided for pouring concrete for fixing.

5. The wind turbine combination structure of gravity foundation and steel pipe pile according to claim 2, characterized in that: The first ring cone, the second ring cone and the third ring cone are all provided with lifting ears, which can be hooked with the lifting hook of the lifting device through the lifting ears.

6. The wind turbine combination structure of gravity foundation and steel pipe pile according to claim 1, characterized in that: The guide assembly comprises a first guide ring and a second guide ring, the first guide ring and the second guide ring are respectively located at two ends of the annular cone assembly, and the first guide ring and the second guide ring coincide with the insertion hole.

7. The wind turbine assembly structure of the gravity foundation and steel pipe piles according to claim 6, characterized in that: The first guide ring and the second guide ring are connected to the ring-cone assembly through a guide bracket.

8. The wind turbine assembly structure of a gravity foundation and steel pipe piles according to claim 6, characterized in that: The guiding component also includes a guiding bell mouth, which is located at the top of the annular cone and is connected to the annular cone component.

9. The wind turbine combination structure of gravity foundation and steel pipe piles according to claim 8, characterized in that: The guide bell mouth is connected with the ring cone component through a bell mouth bracket.

10. A method for combining a gravity foundation and a steel pipe pile with a wind turbine, characterized in that: A wind turbine assembly structure combining a gravity foundation and steel pipe piles as described in any one of claims 1 to 9 comprises the following steps: S1. Place the third ring cone on the seabed at a designated location by means of a lifting device; S2, using a sling to put the second ring cone on the outside of the third ring cone, leaving a second filling gap; S3, using a sling to put the first circular cone on the outside of the second circular cone, leaving a first filling gap; S4. Lift the steel pipe pile by a lifting device and slowly place it vertically into the water. The steel pipe pile first passes through the guide bell mouth, then passes through the first guide ring and the second guide ring, and enters the soil to a certain depth by its own weight, leaving a third filling gap. S5. Use the piling equipment to drive the steel pipe piles into the soil to the required depth; S6. After the pile driving construction is completed, pour concrete in all the gaps from the inside to the outside to form a whole.

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