Offshore wind power high-pile high-bearing platform foundation suitable for sea areas with strong stormy waves and construction method of offshore wind power high-pile high-bearing platform foundation

Abstract

The invention discloses an offshore wind power high pile and high bearing platform foundation suitable for strong storm sea areas and a construction method thereof, 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 piles 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, meanwhile, the problem that large-diameter single-pile construction is limited by large expensive imported piling equipment is effectively solved, and the construction efficiency is improved. Therefore, the device is higher in reliability during construction.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power foundations, and in particular to an offshore wind power high-pile high-cap foundation suitable for strong wind and wave sea areas and a construction method thereof. Background Art

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

[0003] The traditional low and medium pier foundation generally refers to transplanting the foundation type on land to the sea, setting up cofferdams for water protection, and adopting traditional land 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 low and medium piers will be subject to the huge buoyancy and impact force of the waves, which greatly increases the "burden" of the steel pipe piles under pull-out force and endangers the stability of the upper wind turbines.

[0004] The existing high cap foundation has a free length of cap and pile exposed above the ground without soil around 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 cap under the same horizontal external force. Its stability is also worse than that of the medium and low pile cap. In addition, the construction of large-diameter single piles is restricted by large and expensive imported piling equipment, so it is difficult to carry out construction. Summary of the invention

[0005] In order to improve the above-mentioned existing high-cap foundation, due to the free length of the cap and the pile exposed above the ground without soil around to jointly bear the horizontal external force, the stress condition of the 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, and 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, so it is difficult to carry out construction. The present invention provides an offshore wind power high-pile high-cap foundation suitable for strong wind and wave areas and a construction method thereof.

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

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

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

[0009] Optionally, in the above-mentioned offshore wind power high pile high bearing platform foundation suitable for strong wind and wave sea areas, the reinforced steel pipe pile is provided with an inner-pile steel cage, 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 an inner pile corbel ring plate and a sealing plate, and the sealing plate is arranged at the bottom of the inner pile corbel ring plate.

[0011] 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, 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 plurality of high-strength prestressed bolts, and the number of the high-strength prestressed bolts corresponds to the number of reinforced steel pipe piles.

[0013] The present invention also discloses a construction method for an offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas, comprising the following steps:

[0014] S101: First, the reinforced steel pipe pile is manufactured on land, the inner corbel ring plate and the sealing plate are fixedly installed at the bottom of the reinforced steel pipe pile, and the inner steel cage is arranged in the reinforced steel pipe pile, and then it is transported to the construction site by ship;

[0015] S102: After the reinforced steel pipe piles are transported to the wind turbine location, the pile sinking construction of the reinforced steel pipe piles begins, and the pile sinking construction method of the whole long pipe piles is adopted for the construction;

[0016] S103: Then hoist the steel casing onto the reinforced steel pipe piles, install the bottom steel plate, pour the first-phase concrete and perform curing, and pour the reinforced concrete in the reinforced steel pipe piles and perform curing;

[0017] S104: Subsequently, the prestressed bolt group of the wind turbine tower and its auxiliary facilities are installed, and then the second phase of concrete pouring construction and maintenance are carried out;

[0018] S105: After the concrete foundation is cured to the expected level, the steel casing is removed and the wind turbine tower is installed.

[0019] In summary, the present invention includes at least one of the following beneficial effects:

[0020] 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 construction of large-diameter single piles is effectively solved by the constraints of large and expensive imported piling equipment. Therefore, the device is more reliable during construction.

[0021] 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

[0022] Figure 1 is a front view of the present invention;

[0023] Figure 2 It is a partial structural schematic diagram of the reinforced steel pipe pile of the present invention.

[0024] In the figure: 1. Concrete foundation; 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

[0025] The following is combined with Figure 1-2 The present invention is described in further detail.

[0026] Please refer to the attached figure in the instruction manual Figure 1-2 The present invention provides an embodiment: an offshore wind power high-pile high-capping platform foundation suitable for strong wind and wave sea areas, including a concrete cap 1 and a wind turbine tower 2. A connecting ring is arranged in the concrete cap 1. The wind turbine tower 2 is connected to the concrete cap 1 by connecting bolts and the connecting ring. The bottom flange of the wind turbine tower 2 is convenient for fixing the wind turbine tower 2 on the concrete cap 1 by connecting the connecting ring and the connecting bolts.

[0027] The wind turbine tower 2 is fixedly disposed on a concrete cap 1 , and the concrete cap 1 includes a first-phase concrete 11 and a second-phase concrete 12 .

[0028] A plurality of reinforced steel pipe piles 3 are arranged on the bottom surface of the concrete cap 1. A pile reinforcement cage 5 is arranged inside the reinforced steel pipe pile 3, and reinforced concrete 6 is poured inside the reinforced steel pipe pile 3. By pouring a certain height of reinforced concrete 6 into the reinforced steel pipe pile 3, the anchoring effect is strengthened and the bending stiffness of the reinforced steel pipe pile 3 is improved.

[0029] 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, so that the reinforced concrete 6 can solidify in the reinforced steel pipe pile 3.

[0030] 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.

[0031] 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 plurality of high-strength prestressed bolts. The number of the high-strength prestressed bolts corresponds to the number of the 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.

[0032] 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 steel cage 5 is arranged in the reinforced steel pipe pile 3, and 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 steel plate is installed, and 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.

[0033] In order to better demonstrate an offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas, this embodiment proposes a construction method of an offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas, including the following steps:

[0034] Step 1: 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 steel cage 5 is arranged in the reinforced steel pipe pile 3, and then transported to the construction site by ship;

[0035] Step 2: After the reinforced steel pipe pile 3 is transported to the wind turbine position, the pile sinking construction of the reinforced steel pipe pile 3 is started, and the pile sinking construction method of the whole long pipe pile is adopted for the construction;

[0036] Step 3: Then hoist the steel casing onto the reinforced steel pipe pile 3, then install the bottom steel plate, then pour the first-phase concrete 11 and perform curing, and at the same time pour the reinforced concrete 6 in the reinforced steel pipe pile 3 and perform curing;

[0037] Step 4: subsequently installing the prestressed bolt group 4 of the wind turbine tower 2 and its auxiliary facilities, and then pouring the second phase concrete 12 and performing maintenance;

[0038] Step 5: After the concrete cap 1 is cured to the expected level, remove the steel casing and then install the wind turbine tower 2.

[0039] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope 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 protection scope 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 cap (1), a plurality of reinforced steel pipe piles (3) are arranged on the bottom surface of the concrete cap (1), a prestressed bolt group (4) is arranged on the concrete cap (1), the upper end of the prestressed bolt group (4) protrudes out of the concrete cap (1) and is connected to the wind turbine tower (2), and 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).

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 inside the concrete cap (1), and the wind turbine tower (2) is connected to the concrete cap (1) by means of connecting bolts in cooperation with 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: The reinforced steel pipe pile (3) is provided with an inner reinforcement cage (5), and reinforced concrete (6) is poured inside the reinforced steel pipe pile (3).

5. The offshore wind power high pile high bearing platform 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 arranged 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: The inner corbel ring plate (7) and the sealing plate (8) of the pile are both provided with reinforcing ribs.

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).

8. A construction method for an offshore wind power high pile high cap foundation suitable for strong wind and wave sea areas as claimed in any one of claims 1 to 7, comprising the following steps: S101: First, a reinforced steel pipe pile (3) is manufactured on land, a pile inner corbel ring plate (7) and a sealing plate (8) are fixedly installed at the bottom of the reinforced steel pipe pile (3), and a pile inner steel reinforcement cage (5) is arranged in the reinforced steel pipe pile (3), and then the reinforced steel pipe pile (3) is transported to the construction site by ship and machinery; S102: After the reinforced steel pipe pile (3) is transported to the wind turbine location, the pile sinking construction of the reinforced steel pipe pile (3) is started, and the pile sinking construction method of the whole long pipe pile is adopted; S103: Then, the steel casing is hoisted onto the reinforced steel pipe pile (3), and then the bottom steel plate is installed. Then, the first-stage concrete (11) is poured and maintained, and at the same time, the reinforced concrete (6) in the reinforced steel pipe pile (3) is poured and maintained; S104: Subsequently, the prestressed bolt group (4) of the wind turbine tower (2) and its auxiliary facilities are installed, and then the second phase concrete (12) is poured and maintained; S105: After the concrete cap (1) is cured to the desired condition, the steel casing is removed, and then the wind turbine tower (2) is installed.

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