CN113846665B - Combined type offshore wind turbine foundation suitable for deepwater conditions and installation method thereof - Google Patents
Combined type offshore wind turbine foundation suitable for deepwater conditions and installation method thereof Download PDFInfo
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- CN113846665B CN113846665B CN202111205748.1A CN202111205748A CN113846665B CN 113846665 B CN113846665 B CN 113846665B CN 202111205748 A CN202111205748 A CN 202111205748A CN 113846665 B CN113846665 B CN 113846665B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
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Abstract
The invention discloses a combined offshore wind turbine foundation suitable for deep water conditions and an installation method thereof. The combined offshore wind turbine foundation suitable for the deep water condition comprises a grouped pile foundation structure, an anti-sinking plate, a truss structure, an overhaul and maintenance platform and a floating cylinder, anchor chains and an anchoring foundation structure, wherein the grouped pile foundation structure comprises a plurality of deep piles, each deep pile is embedded and fixed in a seabed, the anti-sinking plate is connected with the grouped pile foundation structure, the bottom of the truss structure is connected with the anti-sinking plate, the overhaul and maintenance platform is connected with the top of the truss structure, the floating cylinder is sleeved on the periphery of the truss structure, and the floating cylinder is circumferentially and uniformly connected with the anchor chains, and the other end of each anchor chain is fixed on the seabed through the anchoring foundation structure. The wind turbine foundation structure supports the wind turbine structure through the grouped pile foundation structure and the truss structure, and the mooring system consisting of the buoy, the anchor chain and the anchoring foundation structure can further restrain the displacement of the wind turbine structure, so that the bearing capacity of the offshore wind turbine foundation is increased, and the safety of the wind turbine structure is guaranteed.
Description
Technical Field
The invention relates to the technical field of offshore wind turbine foundations, in particular to a combined type offshore wind turbine foundation suitable for deep water conditions and an installation method thereof.
Background
In recent years, new clean energy has been vigorously developed internationally to achieve sustainable development of energy use in response to global warming. Wind power generation is rapidly developed as the most mature and scaled power generation mode with a spring unwinding part and a commercial development prospect in the field of new energy. As wind turbines extend from land to the sea, offshore wind power is becoming the focus of new energy field development.
At present, the type of fan foundation for offshore shallow water conditions is widely applied to fixed foundations. The pile foundation is penetrated into a seabed soil layer through dynamic or static pressure pile sinking, the upper load is balanced through large size and long burial depth, and compared with other fixed foundations of offshore wind turbines, the pile foundation has the advantages of simple structure, clear load transmission mode, convenience for industrial production and the like. However, as offshore wind power further enters a deep water environment, a large corner is likely to appear on a traditional fixed foundation under the loads of a wind turbine and the environment, and the requirement for severe displacement of the offshore wind turbine during operation is difficult to meet. In addition, although the construction cost of the floating foundation has certain advantages in the deep water environment, the floating foundation still has larger drift and inclination in the marine environment, which affects the normal operation of the wind turbine generator and results in lower power generation efficiency. Therefore, a novel wind turbine foundation with high bearing rigidity, convenience in construction and low cost is urgently needed in offshore wind power development under deep water conditions in the future.
Disclosure of Invention
The invention aims to provide a combined offshore wind turbine foundation suitable for deep water conditions and an installation method thereof aiming at the existing technical current situation, a wind turbine structure is supported by a pile group foundation structure and a truss structure together aiming at deep water severe marine environment, and when the wind turbine structure is subjected to large environmental load, a mooring system consisting of a buoy, an anchor chain and an anchoring foundation structure can further restrict the displacement of the wind turbine structure, so that the bearing capacity of the offshore wind turbine foundation is increased, and the safety of the wind turbine structure is ensured.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combined offshore wind turbine foundation suitable for deepwater conditions and an installation method thereof.
Wherein, be applicable to marine fan foundation of combination formula of deep water condition, including grouser foundation structure, prevent sinking board, truss structure, maintenance platform and flotation pontoon, anchor chain and anchor foundation structure, grouser foundation structure includes that a plurality of deep piles and each deep pile all imbeds and fix in the seabed, prevent sinking the board and be connected with grouser foundation structure, truss structure bottom is connected with preventing sinking the board, it is connected with truss structure top to overhaul maintenance platform, the flotation pontoon cover is established in truss structure's periphery, and the other end that the flotation pontoon upwards evenly connected was equipped with a plurality of anchor chains and each anchor chain all fixes on the seabed through anchor foundation structure.
Furthermore, sleeves matched with the number and the size of deep piles in the grouped pile foundation structure are arranged on the bottom surface of the anti-sinking plate, and when the anti-sinking plate is connected with the grouped pile foundation structure, each deep pile in the grouped pile foundation structure is correspondingly inserted into each sleeve on the anti-sinking plate and is connected with the sleeve.
Furthermore, the truss structure comprises a plurality of main pipes and a plurality of support structures welded among the main pipes.
Further, the supporting structure comprises an X-shaped diameter-variable supporting rod and a horizontal supporting rod.
Further, the anchoring foundation structure is a deep pile, and a fixed hinged support is arranged at the top of the anchoring foundation structure.
Further, the anchoring base structure is a gripping anchor or a suction anchor.
The installation method of the combined offshore wind turbine foundation suitable for the deepwater condition comprises the following steps:
after the pile foundation is positioned, deep piles of the pile group foundation structure and the anchoring foundation structure are driven into the seabed one by one and embedded into the deep bearing layer, and then grouting materials are injected to fill gaps;
assembling a truss structure and connecting the truss structure with the anti-sinking plate, then hoisting the truss structure to a preset position, enabling sleeves arranged on the anti-sinking plate to correspondingly sink into each deep pile of the pile group foundation structure one by one, and grouting and connecting the sleeves and the deep piles by bolts after the anti-sinking plate is leveled;
sleeving the floating barrels on the truss structure, and connecting anchor chains on the floating barrels with fixed hinge supports arranged at the tops of deep-layer piles in the anchoring foundation structure in a one-to-one correspondence manner, wherein the floating barrels are lower than the sea level;
and installing the maintenance platform to the top of the truss structure, and enabling the maintenance platform to be higher than the sea level.
The installation method of the combined offshore wind turbine foundation suitable for the deepwater condition comprises the following steps:
after the pile foundation is positioned, deep piles of the pile group foundation structure are driven into the seabed one by one and embedded into the deep bearing layer, and then grouting materials are injected to fill gaps;
assembling a truss structure and connecting the truss structure with the anti-sinking plate, then hoisting the truss structure to a preset position, enabling sleeves arranged on the anti-sinking plate to correspondingly sink into each deep pile one by one, leveling the anti-sinking plate, and then grouting and connecting the sleeves with the deep piles and connecting the sleeves with bolts;
sleeving a buoy on a truss structure, and then fixing an anchor chain on the buoy on the seabed through a grabbing anchor or a suction anchor, wherein the buoy is lower than the sea level;
and installing the maintenance platform to the top of the truss structure, and enabling the maintenance platform to be higher than the sea level. The invention has the beneficial effects that:
1. the combined offshore wind turbine foundation suitable for the deep water condition is researched, aiming at the sea condition that bedrock is buried deeply, the truss structure can reduce the load effect of waves and water flow, is high in strength, light in weight and large in bearing capacity, can effectively solve the problem of underwater connection, and meanwhile, the main guide pipe has high structural rigidity, can improve the integral first-order frequency and is suitable for the offshore wind turbine foundation under the deep water condition.
2. The buoy is arranged on the periphery of the truss structure and is lower than the sea level, sufficient buoyancy is provided by the buoy when the water level changes, an anchor chain on the buoy is always kept in a tensioning state, and the truss structure cannot deviate too much even under the deep water condition, so that the load transmitted by the fan structure and the load of the marine environment are balanced, and the overall stability is enhanced.
3. Compared with the prior art, the invention has a deeper application range, the applicable water depth can reach hundreds of meters, and compared with the traditional floating type deep water wind power foundation, the invention greatly saves the construction cost, has faster installation speed and easily ensures the quality.
Drawings
Fig. 1 is a schematic structural view of a combined offshore wind turbine foundation in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a combined offshore wind turbine foundation in embodiment 2 of the present invention.
Description of the labeling: 1. the device comprises a fan tower cylinder, 2, diagonal braces, 3, a maintenance platform, 4, a sea level, 5, a buoy, 6, an anchor chain, 7, a fixed hinged support, 8, a deep pile, 9, a main guide pipe, 10, horizontal support rods, 11, X-shaped variable-diameter support rods, 12, an anti-sinking plate, 13, a seabed, 14, a sleeve, 15 and a grabbing anchor.
Detailed Description
The invention will be further explained with reference to the drawings.
First, the structure of the combined offshore wind turbine foundation will be described in detail.
Referring to fig. 1-2, a combined offshore wind turbine foundation suitable for deep water conditions includes a pile group foundation structure, an anti-sinking plate 12, a truss structure, a maintenance platform 3, a buoy 5, an anchor chain 6 and an anchoring foundation structure.
The grouped pile foundation structure comprises a plurality of deep piles 8, each deep pile 8 is embedded and fixed in a seabed 13, the anti-sinking plate 12 is connected with the grouped pile foundation structure, the bottom of the truss structure is connected with the anti-sinking plate 12, and the maintenance platform 3 is connected with the top of the truss structure.
The bottom surface of the anti-sinking plate 12 is provided with sleeves 14 matching with the number and size of the deep piles 8 in the pile group foundation structure, in the figure, the number of the deep piles 8 and the sleeves 14 is 4, and when the anti-sinking plate 12 is connected with the pile group foundation structure, each deep pile 8 in the pile group foundation structure is correspondingly inserted into and connected with each sleeve 14 on the anti-sinking plate 12.
The truss structure comprises a plurality of main pipes 9 and a plurality of support structures welded between the main pipes 9, wherein the number of the main pipes 9 is 4, that is, the truss structure is a truss type integral steel framework upright column structure, and further, the truss structure can be designed to be square. Specifically, the supporting structure comprises an X-shaped reducing supporting rod 11 and a horizontal supporting rod 10.
The 5 covers of flotation pontoon are established in truss structure's periphery, and 5 upwards evenly connected of flotation pontoon are equipped with a plurality of anchor chains 6 and the other end of each anchor chain 6 all fixes on seabed 13 through anchor foundation structure, and for improving the equilibrium, the quantity of anchor chain 6 is not less than 3. As one of the embodiments, the anchoring base structure is a deep pile 8 and is provided with a fixed hinge support 7 at the top. As another embodiment, the anchoring infrastructure is a holding anchor 15 or a suction anchor.
In the above technical scheme, the dead weight and the vertical load of the fan structure are mainly transmitted to the pile group foundation structure at the bottom of the truss structure through the truss structure, and further borne by the friction force of shallow soil and the bearing layer at the bottom of the pile, and under severe sea conditions (when wind waves are large), the huge horizontal load caused by the wind waves on the fan structure and the truss structure is mainly transmitted to the anchoring foundation by the anchor chain 6 on the buoy 5.
Next, a method for installing the combined offshore wind turbine foundation will be described in detail.
Example 1:
referring to fig. 1, an installation method of a combined offshore wind turbine foundation suitable for deep water conditions includes the following steps:
after the pile foundation is positioned, a pile driving boat or a floating crane device is adopted to match with a hydraulic hammer to carry out construction steps of pile lifting, pile erecting, pile inserting, pile hammering, pile sinking and the like, deep piles 8 of the grouped pile foundation structure and the anchoring foundation structure are driven into the seabed 13 one by one and embedded into the deep bearing layer, and then grouting materials are injected to fill gaps;
assembling a truss structure and connecting the truss structure with an anti-sinking plate 12, generally welding, then hoisting the truss structure to a preset position by using a crane ship, so that sleeves 14 arranged on the anti-sinking plate 12 are correspondingly sunk into each deep pile 8 of the pile group foundation structure one by one, and after leveling the anti-sinking plate 12, grouting and connecting the sleeves 14 with the deep piles 8 and connecting the sleeves with bolts;
sleeving the buoys 5 on a truss structure, and then connecting anchor chains 6 on the buoys 5 with fixed hinge supports 7 arranged at the tops of deep-layer piles 8 in an anchoring foundation structure in a one-to-one correspondence manner, wherein the buoys 5 are lower than the sea level 4;
the service maintenance platform 3 is mounted to the top of the truss structure with the service maintenance platform 3 above sea level 4. The joint of the truss structure and the maintenance platform 3 is reinforced.
After the installation of offshore wind turbine foundation is completed, the wind turbine is installed to the maintenance platform 3 through the wind turbine tower barrel 1, and a plurality of inclined support rods 2 connected with the maintenance platform 3 are circumferentially arranged on the wind turbine tower barrel 1. The size of the anti-sinking plate 12 is larger than that of the maintenance platform 3, and in actual working conditions, the number of the inclined support rods 2 and the size of the anti-sinking plate 12 can be adjusted according to the conditions of ocean currents and wind power so as to ensure that the structure of the fan is stable enough.
Example 2:
referring to fig. 2, an installation method of a combined offshore wind turbine foundation suitable for deep water conditions includes the following steps:
after the pile foundation is positioned, pile driving ships or floating crane equipment are adopted to match with hydraulic hammers to carry out construction steps of pile lifting, pile erecting, pile inserting, pile hammering, pile sinking and the like, deep piles 8 of the pile group foundation structure are driven into the seabed 13 one by one and embedded into the deep bearing layer, and then grouting materials are injected to fill gaps;
assembling a truss structure and connecting the truss structure with the anti-sinking plate 12, generally welding, then hoisting the truss structure to a preset position by using a crane ship, so that the sleeves 14 arranged on the anti-sinking plate 12 are correspondingly sunk into each deep pile 8 one by one, and after leveling the anti-sinking plate 12, grouting and connecting the sleeves 14 with the deep piles 8 and connecting the sleeves with bolts;
sleeving a buoy 5 on a truss structure, and then fixing an anchor chain 6 on the buoy 5 on a seabed 13 through a grabbing anchor 15 or a suction anchor, and enabling the buoy 5 to be lower than the sea level 4;
the service maintenance platform 3 is mounted to the top of the truss structure with the service maintenance platform 3 above sea level 4. The joint of the truss structure and the maintenance platform 3 is reinforced.
After the installation of offshore wind turbine foundation is completed, the wind turbine is installed to the maintenance platform 3 through the wind turbine tower barrel 1, and a plurality of inclined support rods 2 connected with the maintenance platform 3 are circumferentially arranged on the wind turbine tower barrel 1. The size of the anti-sinking plate 12 is larger than that of the maintenance platform 3, and in actual working conditions, the number of the inclined support rods 2 and the size of the anti-sinking plate 12 can be adjusted according to the conditions of ocean currents and wind power so as to ensure that the structure of the fan is stable enough.
In both embodiments, the buoys 5 are disposed at the periphery of the truss structure and below the sea level 4, and even if the truss structure is displaced, the buoy 5 and the anchor chain 6 are restrained. The buoy 5 ensures that the anchor chain 6 is always in tension as the water level changes.
Overall, the advantages of the invention are as follows:
1. aiming at the sea condition that the bedrock is buried deeply, the truss structure can reduce the load action of waves and water flow, has high strength, light weight and large bearing capacity, can effectively solve the problem of underwater connection, and meanwhile, the main duct 9 has high structural rigidity, can improve the integral first-order frequency and is suitable for the offshore wind turbine foundation under the deep water condition;
2. the buoy 5 is arranged on the periphery of the truss structure and is lower than the sea level 4, when the water level changes, the buoy 5 provides enough buoyancy, so that the anchor chain 6 on the buoy 5 is always kept in a tensioning state, and even under a deep water condition, the truss structure cannot deviate too much, so that the load transmitted by the fan structure and the load of the marine environment are balanced, and the overall stability is enhanced;
3. compared with the prior art, the invention has a deeper application range, the applicable water depth can reach hundreds of meters, and compared with the traditional floating type deep water wind power foundation, the invention greatly saves the construction cost, has faster installation speed and easily ensures the quality.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, therefore, all equivalent changes in the principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a combination formula offshore wind turbine basis suitable for deep water condition which characterized in that: the foundation structure comprises a pile group foundation structure, an anti-sinking plate, a truss structure, an overhaul and maintenance platform, a buoy, anchor chains and an anchoring foundation structure, wherein the pile group foundation structure comprises a plurality of deep piles, each deep pile is embedded and fixed in a seabed, the anti-sinking plate is connected with the pile group foundation structure, the bottom of the truss structure is connected with the anti-sinking plate, the overhaul and maintenance platform is connected with the top of the truss structure, the buoy is sleeved on the periphery of the truss structure and is lower than the sea level, the buoy provides enough buoyancy when the water level changes, the anchor chains on the buoy are always kept in a tensioning state, the buoy is uniformly connected and provided with the anchor chains in the circumferential direction, the other end of each anchor chain is fixed on the seabed through the anchoring foundation structure, sleeves matched with the number and the size of the deep piles in the pile group foundation structure are arranged on the bottom surface of the anti-sinking plate, and when the anti-sinking plate is connected with the pile group foundation structure, each deep pile in the pile group foundation structure is inserted into and connected with each sleeve on the anti-sinking plate correspondingly.
2. The combined offshore wind turbine foundation applicable to deepwater conditions as recited in claim 1, wherein: the truss structure comprises a plurality of main pipes and a plurality of support structures welded among the main pipes.
3. The combined offshore wind turbine foundation applicable to deepwater conditions as recited in claim 2, wherein: the supporting structure comprises an X-shaped diameter-variable supporting rod and a horizontal supporting rod.
4. The combined offshore wind turbine foundation applicable to deepwater conditions as recited in claim 1, wherein: the anchoring foundation structure is a deep pile, and a fixed hinged support is arranged at the top of the anchoring foundation structure.
5. The combined offshore wind turbine foundation applicable to deepwater conditions as recited in claim 1, wherein: the anchoring base structure is a gripping anchor or a suction anchor.
6. An installation method of a combined offshore wind turbine foundation suitable for deep water conditions according to any one of claims 1 to 4, comprising: the method comprises the following steps:
after the pile foundation is positioned, deep piles of the pile group foundation structure and the anchoring foundation structure are driven into the seabed one by one and embedded into the deep bearing layer, and then grouting materials are injected to fill gaps;
assembling a truss structure and connecting the truss structure with the anti-sinking plate, then hoisting the truss structure to a preset position, enabling sleeves arranged on the anti-sinking plate to correspondingly sink into each deep pile of the pile group foundation structure one by one, and grouting and connecting the sleeves and the deep piles by bolts after the anti-sinking plate is leveled;
sleeving the floating barrels on the truss structure, and connecting anchor chains on the floating barrels with fixed hinge supports arranged at the tops of deep-layer piles in the anchoring foundation structure in a one-to-one correspondence manner, wherein the floating barrels are lower than the sea level;
and installing the maintenance platform to the top of the truss structure, and enabling the maintenance platform to be higher than the sea level.
7. The installation method of the combined offshore wind turbine foundation suitable for the deep water condition according to any one of claims 1 to 3 and 5, wherein the installation method comprises the following steps: the method comprises the following steps:
after the pile foundation is positioned, deep piles of the pile group foundation structure are driven into the seabed one by one and embedded into the deep bearing layer, and then grouting materials are injected to fill gaps;
assembling a truss structure and connecting the truss structure with the anti-sinking plate, then hoisting the truss structure to a preset position, enabling sleeves arranged on the anti-sinking plate to correspondingly sink into each deep pile one by one, leveling the anti-sinking plate, and then grouting and connecting the sleeves with the deep piles and connecting the sleeves with bolts;
sleeving a buoy on a truss structure, and then fixing an anchor chain on the buoy on the seabed through a grabbing anchor or a suction anchor, wherein the buoy is lower than the sea level;
and installing the maintenance platform to the top of the truss structure, and enabling the maintenance platform to be higher than the sea level.
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| CN114525820A (en) * | 2022-03-10 | 2022-05-24 | 中国长江三峡集团有限公司 | Offshore single-pile prestress adjusting device and control method thereof |
| CN116623709A (en) * | 2023-07-13 | 2023-08-22 | 中国电建集团重庆工程有限公司 | Deepwater pile-tube combined foundation for offshore wind power |
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