Offshore wind power high-pile high-bearing-platform foundation suitable for sea areas with strong stormy waves

Abstract

The utility model discloses an offshore wind power high pile and high bearing platform foundation suitable for a sea area with strong stormy waves, and relates to the technical field of offshore wind power foundations, the offshore wind power high pile and high bearing platform foundation comprises a concrete bearing platform and a fan tower, the fan tower is fixedly arranged on the concrete bearing platform, and a plurality of reinforced steel pipe piles are arranged on the bottom surface of the concrete bearing platform. A prestressed bolt group is arranged on the concrete bearing platform, the upper end of the prestressed bolt group extends out of the concrete bearing platform and is connected with the fan tower drum, and the lower end of the prestressed bolt group penetrates through the concrete bearing platform and is connected with the top end of the reinforced steel pipe pile. The reinforced concrete is additionally arranged in the reinforced steel pipe pile on the lower portion of the concrete bearing platform foundation, compared with a traditional bearing platform foundation, the rigidity and strength of the lower portion of the foundation are enhanced, more small-diameter steel pipe piles can be adopted under the same condition, and meanwhile the problem that large-diameter single pile construction is limited by large expensive imported piling equipment is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power foundations, in particular to an offshore wind power high-pile high-cap foundation suitable for sea areas with strong winds and waves. Background Art

[0002] At present, my country is in a period of rapid development of offshore wind power. Concrete pedestal pile foundation is a mature and reliable foundation form. This foundation type has been used in many sea areas in China, including the East China Sea Bridge Demonstration Wind Farm, Jiangsu Xiangshui Offshore Wind Farm, Guodian Putuo, Cangnan No. 4, etc. The traditional concrete pedestal pile foundation consists of driven steel pipe piles and cast-in-place reinforced concrete structure. The upper pedestal structure is supported by multiple small-diameter inclined steel pipes, which has good horizontal bearing capacity.

[0003] Traditional medium and low pier foundations generally refer to transplanting the onshore foundation type to the sea, setting up cofferdams for water protection, and adopting traditional onshore construction methods. This foundation construction technology is mature but is only applicable to intertidal areas with shallow water depths and close to the shore; for offshore wind power projects in areas with strong winds and waves, the medium and low piers will be subject to the huge buoyancy and impact force of the waves, which greatly increases the "burden" of the pull-out force on the steel pipe piles and endangers the stability of the upper wind turbines.

[0004] The existing high-pile foundation has a free length of the pedestal and the pile exposed above the ground without soil around it to jointly bear the horizontal external force. The stress condition of the pile is relatively unfavorable, and the internal force and displacement are greater than those of the medium and low pile pedestal under the same horizontal external force. Its stability is also worse than that of the medium and low pile pedestal, and the construction of large-diameter single piles is restricted by large and expensive imported piling equipment. Utility Model Content

[0005] In order to improve the above-mentioned existing high-cap foundation, due to the free length of the cap and the foundation pile exposed to the ground without soil around to jointly bear the horizontal external force, the stress condition of the foundation pile is relatively unfavorable, the internal force and displacement are greater than those of the medium and low pile cap under the same horizontal external force, its stability is also worse than that of the medium and low pile cap, and the construction of large-diameter single piles is restricted by large and expensive imported piling equipment, the utility model provides an offshore wind power high-pile high-cap foundation suitable for strong wind and wave sea areas.

[0006] The utility model discloses an offshore wind power high-pile high-capping platform foundation suitable for sea areas with strong winds and waves, comprising a concrete capping platform and a wind turbine tower, wherein the wind turbine tower is fixedly arranged on the concrete capping platform, a plurality of reinforced steel pipe piles are arranged on the bottom surface of the concrete capping platform, a prestressed bolt group is arranged on the concrete capping platform, the upper end of the prestressed bolt group extends out of the concrete capping platform and is connected to the wind turbine tower, and the lower end of the prestressed bolt group passes through the concrete capping platform and is connected to the top of the reinforced steel pipe pile.

[0007] Optionally, in the above-mentioned offshore wind power high pile high pedestal foundation suitable for sea areas with strong winds and waves, a connecting ring is provided in the concrete pedestal, and the wind turbine tower is connected to the concrete pedestal through connecting bolts and the connecting ring.

[0008] Optionally, in the above-mentioned high-pile high-cap foundation for offshore wind power plants suitable for use in sea areas with strong winds and waves, the concrete cap includes first-phase concrete and second-phase concrete.

[0009] Optionally, in the above-mentioned high-pile high-cap foundation for offshore wind power plants suitable for sea areas with strong winds and waves, an inner-pile reinforcement cage is provided in the reinforced steel pipe pile, and reinforced concrete is poured in the reinforced steel pipe pile.

[0010] Optionally, in the above-mentioned offshore wind power high pile high pedestal foundation suitable for sea areas with strong winds and waves, the inner bottom of the reinforced steel pipe pile is provided with a pile inner corbel ring plate and a sealing plate, and the sealing plate is provided at the bottom of the pile inner corbel ring plate.

[0011] Optionally, in the above-mentioned high-pile high-cap foundation for offshore wind power plants in sea areas with strong winds and waves, reinforcing ribs are provided in the corbel ring plate and the sealing plate inside the pile.

[0012] Optionally, in the above-mentioned offshore wind power high pile high pedestal foundation suitable for sea areas with strong winds and waves, the prestressed bolt group is composed of a number of high-strength prestressed bolts, and the number of the high-strength prestressed bolts corresponds to the number of reinforced steel pipe piles.

[0013] In summary, the present invention has at least one of the following beneficial effects:

[0014] Reinforced concrete is added to the reinforced steel pipe piles at the bottom of the concrete cap foundation. Compared with the traditional cap foundation, the rigidity and strength of the lower part of the foundation are enhanced. Under the same conditions, more small-diameter steel pipe piles can be used. At the same time, the problem of large-diameter single pile construction being restricted by large and expensive imported piling equipment is effectively solved.

[0015] By adding reinforced concrete to the steel pipe piles at the bottom of the pedestal foundation, the anti-collision performance of the foundation can be increased, the rigidity and strength of the lower part can be strengthened, and the center of gravity of the entire foundation can be lowered, thereby significantly improving the anti-collision performance of the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the utility model;

[0017] Figure 2 It is a partial structural diagram of the reinforced steel pipe pile of the utility model.

[0018] In the figure: 1. Concrete cap; 11. First-phase concrete; 12. Second-phase concrete; 2. Wind turbine tower; 3. Reinforced steel pipe pile; 4. Prestressed bolt group; 5. Steel cage in pile; 6. Reinforced concrete; 7. Corbel ring plate in pile; 8. Closing plate. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-2 The utility model is described in further detail.

[0020] Please refer to the attached figure in the instruction manual Figure 1-2 The utility model provides an embodiment: an offshore wind power high pile high pedestal foundation suitable for strong wind and wave sea areas, including a concrete pedestal 1 and a wind turbine tower 2. A connecting ring is provided in the concrete pedestal 1, and the wind turbine tower 2 is connected to the concrete pedestal 1 by connecting bolts and the connecting ring. The bottom flange of the wind turbine tower 2 is conveniently fixed to the concrete pedestal 1 by the connecting ring and the connecting bolts.

[0021] The wind turbine tower 2 is fixedly mounted on a concrete cap 1 , which includes a first-phase concrete 11 and a second-phase concrete 12 .

[0022] A number of reinforced steel pipe piles 3 are provided on the bottom surface of the concrete cap 1. A pile reinforcement cage 5 is provided inside the reinforced steel pipe piles 3, and reinforced concrete 6 is poured inside the reinforced steel pipe piles 3. By pouring a certain height of reinforced concrete 6 into the reinforced steel pipe piles 3, the anchoring effect is strengthened and the bending stiffness of the reinforced steel pipe piles 3 is improved.

[0023] The inner bottom of the reinforced steel pipe pile 3 is provided with an inner corbel ring plate 7 and a sealing plate 8. The sealing plate 8 is arranged at the bottom of the inner corbel ring plate 7. The cooperation between the corbel ring plate 7 and the sealing plate 8 facilitates the sealing of the bottom of the reinforced steel pipe pile 3, thereby allowing the reinforced concrete 6 to solidify in the reinforced steel pipe pile 3.

[0024] Reinforcement ribs are provided inside the corbel ring plate 7 and the sealing plate 8 in the pile, so as to increase the strength of the corbel ring plate 7 and the sealing plate 8 in the pile.

[0025] A prestressed bolt group 4 is provided on the concrete cap 1. The upper end of the prestressed bolt group 4 extends out of the concrete cap 1 and is connected to the wind turbine tower 2. The lower end of the prestressed bolt group 4 passes through the concrete cap 1 and is connected to the top of the reinforced steel pipe pile 3. The prestressed bolt group 4 is composed of a number of high-strength prestressed bolts. The number of high-strength prestressed bolts corresponds to the number of reinforced steel pipe piles 3. The prestressed bolt group 4 is used to facilitate the fixed installation of the wind turbine tower 2 on the concrete cap 1, and at the same time, the reinforced steel pipe piles 3 are fixed in the concrete cap 1.

[0026] In summary: first, the reinforced steel pipe pile 3 is manufactured on land, the inner corbel ring plate 7 and the sealing plate 8 are fixedly installed at the bottom of the reinforced steel pipe pile 3, and the inner reinforcement cage 5 is arranged in the reinforced steel pipe pile 3. Then, the reinforced steel pipe pile 3 is sunk, and then the steel casing is hoisted on the reinforced steel pipe pile 3, and then the bottom sealing steel plate is installed. Then, the first phase concrete 11 is poured, and at the same time, the reinforced concrete 6 in the reinforced steel pipe pile 3 is poured, and then the second phase concrete 12 is poured, and finally the wind turbine tower 2 is installed.

[0027] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas, comprising a concrete cap (1) and a wind turbine tower (2), characterized in that: The wind turbine tower (2) is fixedly mounted on a concrete pedestal (1); a plurality of reinforced steel pipe piles (3) are arranged on the bottom surface of the concrete pedestal (1); a prestressed bolt group (4) is arranged on the concrete pedestal (1); the upper end of the prestressed bolt group (4) extends out of the concrete pedestal (1) and is connected to the wind turbine tower (2); and the lower end of the prestressed bolt group (4) passes through the concrete pedestal (1) and is connected to the top end of the reinforced steel pipe pile (3).

2. The offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas according to claim 1 is characterized by: A connecting ring is provided in the concrete pedestal (1), and the wind turbine tower (2) is connected to the concrete pedestal (1) through the cooperation of connecting bolts and the connecting ring.

3. The offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas according to claim 1 is characterized by: The concrete foundation (1) comprises first-phase concrete (11) and second-phase concrete (12).

4. The offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas according to claim 1 is characterized by: An inner reinforcement cage (5) is provided in the reinforced steel pipe pile (3), and reinforced concrete (6) is poured in the reinforced steel pipe pile (3).

5. The offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas according to claim 1 is characterized by: The inner bottom of the reinforced steel pipe pile (3) is provided with a pile inner corbel ring plate (7) and a sealing plate (8), and the sealing plate (8) is provided at the bottom of the pile inner corbel ring plate (7).

6. The offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas according to claim 5 is characterized by: Reinforcement ribs are provided in the pile inner corbel ring plate (7) and the sealing plate (8).

7. The offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas according to claim 1 is characterized by: The prestressed bolt group (4) is composed of a plurality of high-strength prestressed bolts, and the number of the high-strength prestressed bolts corresponds to the number of the reinforced steel pipe piles (3).

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