CN114855865A - Tensioning type fan foundation anchored on rock-based seabed and arrangement method - Google Patents
Tensioning type fan foundation anchored on rock-based seabed and arrangement method Download PDFInfo
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- CN114855865A CN114855865A CN202210556599.1A CN202210556599A CN114855865A CN 114855865 A CN114855865 A CN 114855865A CN 202210556599 A CN202210556599 A CN 202210556599A CN 114855865 A CN114855865 A CN 114855865A
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- 239000011435 rock Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004873 anchoring Methods 0.000 claims abstract description 77
- 238000005553 drilling Methods 0.000 claims description 25
- 238000010276 construction Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000007596 consolidation process Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000011900 installation process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 6
- 238000005096 rolling process Methods 0.000 abstract description 2
- 238000007667 floating Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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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
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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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 provides a tension type fan foundation anchored on a rock foundation seabed and an arrangement method, wherein the tension type fan foundation comprises an anchoring system, an anchoring cable, a semi-submersible type module, a fan tower and a wind turbine generator; the upper end of the anchoring system is connected with an anchoring cable, and the lower end of the anchoring system is anchored on the seabed; the upper end of the mooring cable is connected with a semi-submersible module; the semi-submersible module is used for adjusting the buoyancy of the semi-submersible module to pre-tension the mooring cable; and the top of the semi-submersible module is sequentially provided with a fan tower cylinder and a wind turbine generator arranged at the top of the fan tower cylinder. The tension type fan foundation structure anchored on the foundation seabed is semi-compliant and semi-rigid, buoyancy, dead weight and anchor chain pretension are balanced, the larger pretension enables the foundation structure to have smaller rolling, pitching and heaving motion amplitudes, the fan tower drum is almost kept in a vertical state under normal working conditions, the power generation efficiency is improved, the length of a dynamic cable is reduced, and a wind turbine generator with larger power can be configured on the basis.
Description
Technical Field
The invention belongs to the technical field of offshore wind power generation, and particularly relates to a tension type fan foundation anchored on a rock foundation seabed and an arrangement method.
Background
Wind power generation is the fastest-developing green energy technology in the world, and due to abundant wind energy resources on the sea and the feasibility of the current technology, the sea becomes a rapidly-developing wind power market. The development and utilization of offshore wind power draw great attention worldwide, and great progress is made in development technology.
With the planning and development of offshore wind power in China, pile foundations are generally adopted as supporting structures in offshore sea areas, and the deep sea areas lack economic foundation forms. At present, aiming at a rock-based seabed, an offshore wind power structure mainly adopts a gravity type foundation and a fixed socketed pile foundation. The gravity type foundation is large in size and weight, needs a large crane, has high requirements for the flatness of the seabed surface of a rock foundation, often needs to be leveled and preprocessed before the gravity type foundation is installed, is complex in construction process, low in efficiency and incapable of being applied to a deepwater environment. The fixed rock-socketed pile foundation is constructed by using mechanical equipment such as a large crane ship, a drilling machine and a piling machine, a construction process of 'driving-drilling-driving' is often adopted for multiple times, the perpendicularity and the bearing capacity of a pile body are repeatedly measured in the pile sinking process, grouting reinforcement is carried out on the pile side, the construction process is various, the difficulty is high, the offshore construction time consumption is long, the cost is high, the deep and offshore environment conditions are severe, the applicability of the fixed rock-socketed pile foundation is poor, and the construction and construction cost is greatly increased.
Disclosure of Invention
The first purpose of the present invention is to provide a tension type wind turbine foundation anchored on the rock foundation seabed, which overcomes the disadvantages of the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
the utility model provides a tensioning formula fan basis of anchoring in rock-based seabed which characterized in that: the tension type fan foundation anchored on the rock-based seabed comprises a rock-based anchoring system, an anchoring cable, a semi-submersible module, a fan tower and a wind turbine;
the upper end of the rock foundation anchoring system is connected with an anchoring cable, and the lower end of the anchoring system is anchored on a rock foundation seabed;
the mooring cable is of a tensioning structure, and the upper end of the mooring cable is connected with the semi-submersible module;
the semi-submersible module is used for adjusting the buoyancy of the semi-submersible module to pre-tension the mooring cable in the installation process;
the top of the semi-submersible module is sequentially provided with a fan tower cylinder and a wind turbine generator arranged at the top of the fan tower cylinder;
the anchoring system comprises an anchoring panel and a plurality of anchor rods, the plurality of anchor rods form a micro pile array, the anchoring panel is fixed to the top of the micro pile array formed by the plurality of anchor rods, and the lower ends of the anchor rods are inserted into seabed rock bodies and connected in a grouting mode.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: and the lower end of the anchor rod and the seabed rock mass are anchored through grouting.
As a preferred technical scheme of the invention: and an anchor eye is arranged in the center of the anchoring panel and is used for connecting an anchoring cable.
As a preferred technical scheme of the invention: the semi-submersible module sequentially comprises four ballast tanks, a middle vertical buoy, an upper transition section and a connecting flange from bottom to top;
the inner end of the ballast tank is connected to the bottom of the middle vertical buoy, the outer end of the ballast tank is provided with a cable guide hole for connecting an anchoring cable, and a ballast pump is arranged in the ballast tank and used for injecting water or draining water to adjust buoyancy;
a platform is arranged in the middle vertical pontoon to arrange related equipment of the wind turbine generator, and the upper end of the middle vertical pontoon is welded with the bottom of the upper transition section;
and the top of the upper transition section is provided with a connecting flange which is connected with a flange plate at the bottom of the fan tower cylinder.
As a preferred technical scheme of the invention: and berthing facilities are also arranged on the lateral sides of the semi-submersible modules.
As a preferred technical scheme of the invention: and a reinforcing plate and a ribbed plate are arranged in the middle vertical buoy.
As a preferred technical scheme of the invention: the upper transition section is a steel truss to reduce the steel consumption and the environmental load.
As a preferred technical scheme of the invention: the wind turbine tower cylinder is composed of a plurality of sections of tower cylinders, the upper tower cylinder and the lower tower cylinder are connected through flange plates, and the top end of the wind turbine tower cylinder is connected with the wind turbine generator through the flange plates.
As a preferred technical scheme of the invention: the wind turbine generator comprises a cabin, a hub and blades.
The invention also aims to provide a method for arranging the tension type fan foundation anchored on the rock foundation seabed, aiming at the defects in the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a method for arranging a tension type fan foundation anchored on a foundation seabed comprises the following steps:
the first step is as follows: drilling a small-diameter drill hole slightly larger than the size of the anchor rod on the rock-based seabed by using an underwater drilling machine or a traditional geological drilling machine at the position of the fan position, wherein the drill hole is deep to a bearing layer to meet the requirement of bearing capacity, and the arrangement positions of the drill holes correspond to the preset anchor bolt holes of the anchor panel one to one; if the height span of the bedrock at the anchoring system is large, the bedrock leveling operation can be performed before drilling or during grouting operation after drilling;
the second step is that: the drilling depth corresponds to the length of the anchor rod one by one, after the anchor rod is drilled to a specified depth, bedrock fragments and residues in the drilled hole are cleaned, the anchor rod is inserted into the drilled hole one by using an underwater robot to the bottom, the verticality of the anchor rod is adjusted, a grouting guide pipe is guided to be inserted into the bottom of the existing drilled hole by using the underwater robot, high-strength and high-density grouting material is injected, and the guide pipe is gradually lifted to the surface of the bedrock at the same time, so that compact and seamless grouting is ensured;
the third step: after grouting and consolidation, installing an anchoring panel by using an underwater robot; making the micro pile array formed by the anchor rods penetrate through the prefabricated anchor bolt holes on the surface of the anchoring panel and fixed by anchor bolt nuts; the step is completely operated on the surface of the underwater sea bed, is hardly influenced by environmental conditions such as wind, wave and flow, and has long available construction window period;
the fourth step: after the anchoring panel is installed, the lower end of the anchoring cable is pulled by an underwater robot and fixed at the position of an anchor eye of the anchoring panel, and the upper end of the pulled anchoring cable is connected with a buoy positioned on the sea surface; the buoy is a temporary facility and is used for towing the anchoring cable to the sea surface, so that the anchoring cable is protected from bottom-touching damage on one hand, and the anchoring cable is conveniently found and the upper end of the anchoring cable is conveniently fixed after the semi-submersible module is in place on the other hand;
the fifth step: high-density concrete is injected into the bottoms of four ballast tanks of the semi-submersible module to serve as fixed ballast so as to reduce the integral gravity center of the structure, increase the draft and improve the structural stability; integrally assembling and fitting-out a fan tower cylinder and a wind turbine generator set on a wharf or a dock and a semi-submersible module, injecting water into the wharf or the dock to enable a foundation structure to naturally float, and towing the foundation structure to a position of a construction fan position; large-scale crane ships and expensive transport ships are not required to be called, so that the engineering cost is saved;
and a sixth step: realizing one-step installation of the foundation structure; after the foundation structure is transported to a construction site, a ballast pump positioned in a ballast tank is opened to suck ballast water, and the foundation draft is increased; under the deep draft state of foundation, select the low tide level period in the construction window period, carry out the marine one-step installation of foundation: an underwater robot is used for enabling the mooring cable on the buoy to penetrate through a position of a mooring cable hole at the end part of the ballast tank and further to be drawn to the upper part of the semi-submersible module for connection, after all the mooring cables are connected, the mooring cable naturally rises along with the water level, and a ballast pump arranged in the semi-submersible module is adjusted to discharge ballast water to reduce the base draught depth, so that the natural tensioning of the mooring cable is realized, and the buoyancy, the base gravity and the mooring tension are in a balanced state; the whole process has simple and convenient installation steps, and does not need to call a large hoisting vessel and an anchor machine to winch and pull to apply pretension.
The invention provides a tension type fan foundation anchored on a foundation seabed and an arrangement method, which are suitable for offshore wind power development under the geological conditions of the foundation seabed and the seabed with shallow bedrock burial depth, and compared with the prior art, the tension type fan foundation has the following beneficial effects:
1) the method breaks through the limitation that the traditional fan foundation cannot be applied to the rock foundation seabed, and is suitable for different marine environments, geological conditions and large-scale wind turbine generators.
2) The anchoring system provided by the invention has a simple structure, only needs to use the traditional geological exploration drilling machine to drill holes with small diameters on the rock foundation seabed, and carries the guide pipe to carry out grouting connection by the underwater robot, so that the construction process is simple and convenient, and the risk and the cost of the installation of the anchoring system are greatly reduced.
3) The mooring cable can be vertically pre-tensioned through the semi-submersible module in a working state, has strong displacement limiting capacity on a floating foundation, is short in length and small in occupied sea area, and has good economy.
4) The foundation structure is semi-compliant and semi-rigid, the buoyancy, the dead weight and the anchor chain pretension are balanced, the larger pretension enables the rolling, pitching and heaving motion amplitude of the foundation structure to be smaller, the wind turbine tower drum is almost kept in a vertical state under normal working conditions, the power generation efficiency is improved, the length of a dynamic cable is reduced, a wind turbine with larger power can be configured on the basis, and the economy is superior to that of a common floating wind turbine foundation.
5) The semi-submersible module is simple in structure and easy to build, can be prefabricated and assembled on land, is integrally assembled with the mooring cable, the fan tower drum and the fan unit on land and then is towed and transported, and a large crane ship and an expensive transport ship do not need to be called.
6) The invention can realize one-step installation and pre-tensioning of the anchoring cable by adjusting the ballast water by using the underwater robot and the semi-submersible module without dispatching ship hoisting equipment, thereby reducing offshore installation procedures, reducing offshore construction risks, shortening offshore construction time and saving engineering cost.
7) The floating foundation disclosed by the invention has the advantages that the available construction window period is long, the floating foundation can be used for a rock foundation seabed and other types of seabed, meanwhile, the hydrodynamic performance is better, the applicable water depth range is wide, the motion stability can be ensured under different wind directions and wave directions, the power generation efficiency is improved, the economic benefit is good, and the floating foundation is particularly suitable for deep and distant sea wind power generation farms.
Drawings
Fig. 1 is a perspective view of a tension type wind turbine foundation anchored to a foundation seabed according to the present invention.
Fig. 2 is a bolt installation illustration.
Fig. 3 is a perspective view of a semi-submersible module.
Fig. 4 is a vertical cross-sectional view of the semi-submersible module.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
As shown in fig. 1, the tension type wind turbine foundation anchored on the foundation seabed comprises an anchoring system 1, an anchoring cable 2, a semi-submersible module 3, a wind turbine tower 4 and a wind turbine generator 5.
As shown in fig. 1 and 2, the foundation includes four sets of anchoring systems 1, each anchoring system 1 includes anchor rods 11 and anchoring panels 12, the anchor rods 11 are inserted into the seabed for drilling and then grouted, the anchor rods 11 form a micro pile array, anchor bolt holes are preset through two sides of the anchoring panels 12, and the anchoring panels 12 are sleeved on the anchor rods 11 to form the micro pile array and fixed by anchor bolt nuts. The center of the anchoring panel 12 is provided with an anchor eye for connecting the anchoring line 2. The axial directions of two adjacent sets of anchoring systems are mutually vertical.
As shown in fig. 1, mooring lines 2 are connected at their lower ends to the mooring eye of the mooring system and at their upper ends to the fairlead of the semi-submersible module 3. After the foundation is assembled and in a static state, the anchoring cable is in a vertical state, and the buoyancy of the foundation, the gravity of the foundation and the pretension of the anchoring cable are in a balanced state.
As shown in fig. 1, 3 and 4, the semi-submersible module 3 comprises four lower ballast tanks 31, a middle vertical pontoon 32, an upper transition section 33, a connecting flange 34, a mooring facility 35. Two adjacent ballast tanks 31 are identical in size and perpendicular to each other, a fairlead 36 is arranged at the end of each ballast tank 31 and used for connecting the upper end of the mooring cable 2, and a ballast pump 37 is arranged inside each ballast tank 31 and used for water injection and drainage. The four ballast tanks 31 are connected with the vertical buoys 32 in a welding mode, the vertical buoys 32 are equal-diameter cylinders, inner platforms are arranged inside the vertical buoys, and related equipment of the wind turbine generator is arranged. The vertical pontoons 32 are welded at their upper ends to the transition sections 33 and are internally provided with reinforcing plates 38 and ribs 39 to provide sufficient structural strength. The transition section 33 is of a truss structure so as to reduce the steel amount for the structure, and a seal plate and a connecting flange 34 are welded at the upper end of the transition section 33 and connected with a flange plate at the bottom of the fan tower 4.
The fan tower cylinder 4 is composed of a plurality of tower cylinders, adjacent tower sections are connected through a flange plate, and the top end of the fan tower cylinder 4 is connected with the wind turbine generator 5 through the flange plate. The wind turbine 5 includes a nacelle 51, a hub 52, and blades 53.
The tension type fan foundation anchored on the rock-based seabed is realized by the following arrangement method:
the first step is as follows: and drilling a small-diameter drill hole slightly larger than the size of the anchor rod 11 on the rock-based seabed by using an underwater drilling machine or a traditional geological drilling machine at the position of the fan position, wherein the drill hole is deep to a bearing layer to meet the bearing capacity requirement, and the arrangement positions of the drill holes correspond to the anchor bolt holes preset in the anchor panel 12 one by one. If the height span of the bedrock at the anchoring system is large, the bedrock leveling operation can be performed before drilling or during grouting after drilling.
The second step is that: drilling depth and 11 length one-to-one of stock, after drilling to appointed degree of depth, with the basement rock piece in the drilling and residue clean up, reuse underwater robot with the stock 11 insert drilling to the bottom one by one, adjust the stock straightness that hangs down to utilize underwater robot guide grout pipe to insert has the drilling bottom, inject into high-strength high-density grout and promote the pipe gradually simultaneously and until the basement rock surface, guarantee the closely knit seamless of grout.
The third step: after grouting consolidation, the anchor panel 12 is installed using an underwater robot. The micropile array of anchor rods 11 is passed through the preformed anchor bolt holes in the surface of the anchor panel 12 and secured with anchor bolt nuts. The step is completely operated on the surface of the underwater sea bed, is hardly influenced by environmental conditions such as wind, wave and flow, and has long available construction window period.
The fourth step: after the anchoring panel 12 is installed, the underwater robot is used for towing the lower end of the anchoring cable and fixing the lower end of the anchoring cable at the position of an anchor eye of the anchoring panel, and the upper end of the towed anchoring cable is connected with a buoy located on the sea surface. The buoy is a temporary facility and is used for towing the mooring cable to the sea surface, on one hand, the mooring cable 2 is protected from being damaged by touching the bottom, and on the other hand, after the semi-submersible module 3 is in place, the mooring cable is conveniently found and the fixing work of the upper end of the mooring cable 2 is conveniently carried out.
The fifth step: high-density concrete is injected into the bottoms of the four ballast tanks 31 of the semi-submersible module 3 to serve as fixed ballast so as to reduce the integral gravity center of the structure, increase the draft and improve the structural stability. And integrally assembling and outfitting the fan tower cylinder 4 and the wind generating set 5 with the semi-submersible module 3 at a wharf or a dock, injecting water into the wharf or the dock to enable the foundation structure to naturally float, and towing the foundation structure to a position of a construction fan position. Large-scale crane ships and expensive transport ships are not required to be called, and engineering cost is saved.
And a sixth step: one-step installation of the infrastructure is achieved. After the foundation structure is transported to the construction site, ballast pumps located inside the ballast tanks 31 are opened to suck ballast water, and the foundation draft is increased. Under the deep draft state of foundation, select the low tide level period in the construction window period, carry out the marine one-step installation of foundation: and (3) the underwater robot is used for penetrating the mooring cable 2 on the buoy through a guide cable hole at the end part of the ballast tank 31 and further dragging the mooring cable to the upper part of the semi-submersible module for connection, after all the mooring cables are connected, the mooring cable naturally rises along with the water level, and ballast water is discharged by adjusting a ballast pump arranged in the semi-submersible module 3 to reduce the base draught, so that the natural tensioning of the mooring cable is realized, and the buoyancy, the base gravity and the mooring tension are in a balanced state. The whole process has simple and convenient installation steps, and does not need to call a large hoisting vessel and an anchor machine to winch and pull to apply pretension.
The above embodiment is merely a preferred embodiment of the present invention, and those skilled in the art will understand that modifications or substitutions of technical solutions or parameters in the embodiment can be made without departing from the principle and essence of the present invention, and all of them shall be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides a tensioning formula fan basis of anchoring in rock-based seabed which characterized in that: the tension type fan foundation anchored on the rock-based seabed comprises a rock-based anchoring system, an anchoring cable, a semi-submersible module, a fan tower and a wind turbine;
the upper end of the foundation anchoring system is connected with an anchoring cable, and the lower end of the anchoring system is anchored on the foundation seabed;
the mooring cable is of a tensioning structure, and the upper end of the mooring cable is connected with the semi-submersible module;
the semi-submersible module is used for adjusting the buoyancy of the semi-submersible module to pre-tension the mooring cable in the installation process;
the top of the semi-submersible module is sequentially provided with a fan tower and a wind turbine generator arranged at the top of the fan tower;
the anchoring system comprises an anchoring panel and a plurality of anchor rods, the plurality of anchor rods form a micro pile array, the anchoring panel is fixed to the top of the micro pile array formed by the plurality of anchor rods, and the lower ends of the anchor rods are inserted into seabed rock bodies and connected in a grouting mode.
2. The tension type wind turbine foundation anchored to a foundation seabed as claimed in claim 1, wherein: and the lower end of the anchor rod and the seabed rock mass are anchored through grouting.
3. The tension type wind turbine foundation anchored to a foundation seabed as claimed in claim 1, wherein: and an anchor eye is arranged in the center of the anchoring panel and is used for connecting an anchoring cable.
4. The tension type wind turbine foundation anchored to a foundation seabed as claimed in claim 1, wherein: the semi-submersible module sequentially comprises four ballast tanks, a middle vertical buoy, an upper transition section and a connecting flange from bottom to top;
the inner end of the ballast tank is connected to the bottom of the middle vertical buoy, the outer end of the ballast tank is provided with a cable guide hole for connecting an anchoring cable, and a ballast pump is arranged in the ballast tank and used for water injection or drainage;
a platform is arranged in the middle vertical pontoon to arrange related equipment of the wind turbine generator, and the upper end of the middle vertical pontoon is welded with the bottom of the upper transition section;
and the top of the upper transition section is provided with a connecting flange which is connected with a flange plate at the bottom of the fan tower cylinder.
5. The tension type wind turbine foundation anchored to the foundation seabed as recited in claim 4, wherein: and berthing facilities are also arranged on the lateral sides of the semi-submersible modules.
6. The tension type wind turbine foundation anchored to the foundation seabed as recited in claim 4, wherein: and a reinforcing plate and a ribbed plate are arranged in the middle vertical buoy.
7. The tension type wind turbine foundation anchored to the foundation seabed as recited in claim 4, wherein: the upper transition section is a steel truss to reduce the steel consumption and the environmental load.
8. The tension type wind turbine foundation anchored to a foundation seabed as claimed in claim 1, wherein: the wind turbine tower cylinder is composed of a plurality of sections of tower cylinders, the upper tower cylinder and the lower tower cylinder are connected through flange plates, and the top end of the wind turbine tower cylinder is connected with the wind turbine generator through the flange plates.
9. The tension type wind turbine foundation anchored to a foundation seabed as claimed in claim 1, wherein: the wind turbine generator comprises a cabin, a hub and blades.
10. The method of arranging a tension fan foundation anchored to a foundation seabed as recited in claim 1, wherein: the arranging method comprises the following steps:
the first step is as follows: drilling a small-diameter drill hole slightly larger than the size of the anchor rod on the rock-based seabed by using an underwater drilling machine or a traditional geological drilling machine at the position of the fan position sea area, wherein the drill hole is deep to a bearing layer to meet the bearing capacity requirement, and the arrangement positions of the drill holes correspond to the preset anchor bolt holes of the anchor panel one by one; if the height span of the bedrock at the anchoring system is large, the bedrock leveling operation can be performed before drilling or during grouting operation after drilling;
the second step is that: the drilling depth corresponds to the length of the anchor rod one by one, after the anchor rod is drilled to a specified depth, bedrock fragments and residues in the drilled hole are cleaned, the anchor rod is inserted into the drilled hole one by using an underwater robot to the bottom, the verticality of the anchor rod is adjusted, a grouting guide pipe is guided to be inserted into the bottom of the existing drilled hole by using the underwater robot, high-strength and high-density grouting material is injected, and the guide pipe is gradually lifted to the surface of the bedrock at the same time, so that compact and seamless grouting is ensured;
the third step: after grouting and consolidation, installing an anchoring panel by using an underwater robot; making the micro pile array formed by the anchor rods penetrate through the prefabricated anchor bolt holes on the surface of the anchoring panel and fixed by anchor bolt nuts; the step is completely operated on the surface of the underwater sea bed, is hardly influenced by environmental conditions such as wind, wave and flow, and has long available construction window period;
the fourth step: after the anchoring panel is installed, the lower end of the anchoring cable is pulled by an underwater robot and fixed at the position of an anchor eye of the anchoring panel, and the upper end of the pulled anchoring cable is connected with a buoy positioned on the sea surface; the buoy is a temporary facility and is used for towing the anchoring cable to the sea surface, so that the anchoring cable is protected from bottom-touching damage on one hand, and the anchoring cable is conveniently found and the upper end of the anchoring cable is conveniently fixed after the semi-submersible module is in place on the other hand;
the fifth step: high-density concrete is injected into the bottoms of four ballast tanks of the semi-submersible module to serve as fixed ballast so as to reduce the integral gravity center of the structure, increase the draft and improve the structural stability; integrally assembling and fitting-out a fan tower cylinder and a wind turbine generator set on a wharf or a dock and a semi-submersible module, injecting water into the wharf or the dock to enable a foundation structure to naturally float, and towing the foundation structure to a position of a construction fan position; large-scale crane ships and expensive transport ships are not required to be called, so that the engineering cost is saved;
and a sixth step: realizing one-step installation of the foundation structure; after the foundation structure is transported to a construction site, a ballast pump positioned in a ballast tank is opened to suck ballast water, and the foundation draft is increased; under the deep draft state of foundation, select the low tide level period in the construction window period, carry out the marine one-step installation of foundation: an underwater robot is used for enabling the anchoring cable on the buoy to penetrate through a guide cable hole at the end part of the ballast tank and further to be pulled to the upper part of the semi-submersible module to be connected, after all the anchoring cables are connected, the anchoring cable naturally rises along with the water level, and ballast pumps arranged in the semi-submersible module are adjusted to discharge ballast water to reduce the base draught, so that the natural tensioning of the anchoring cable is realized, and the buoyancy, the base gravity and the anchoring tension are in a balanced state; the whole process has simple and convenient installation steps, and does not need to call a large hoisting vessel and an anchor machine to winch and pull to apply pretension.
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