CN219220634U - Marine floating type fan foundation - Google Patents
Marine floating type fan foundation Download PDFInfo
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- CN219220634U CN219220634U CN202320331677.8U CN202320331677U CN219220634U CN 219220634 U CN219220634 U CN 219220634U CN 202320331677 U CN202320331677 U CN 202320331677U CN 219220634 U CN219220634 U CN 219220634U
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Abstract
The utility model discloses an offshore floating type fan foundation, which comprises a plurality of peripheral upright posts (2), a central upright post (3), a supporting member (5) and a mooring chain (6), wherein the peripheral upright posts are arranged on the periphery of the central upright post through the supporting member and are arranged in an outward inclined manner, the peripheral upright posts are divided into an upper section, a middle section and a lower section, the cross section area of the middle section is larger than that of the lower section, the upper section is higher than the water plane, the middle section is arranged in the water plane, and the lower section is lower than the water plane; the bottom of each peripheral upright post is connected with a floating body (4) with a ballast tank inside, the floating body is horizontally arranged, and the center of the floating body is vertically and cross-connected with the central upright post. The utility model is suitable for deep open sea areas with the average water depth of 100 meters and more, can be used for carrying high-capacity fans with the water depth of 16MW and more, can effectively reduce the steel consumption, and has simple construction and low cost.
Description
Technical Field
The utility model relates to an offshore wind power technology, in particular to an offshore floating type fan foundation.
Background
With the gradual development of global offshore resources and the higher demand of offshore industries in offshore areas, the overall development potential of offshore wind power is limited, the offshore wind power project gradually develops to deep sea, and the offshore wind turbine foundation structure also gradually evolves from a fixed support structure to a floating support structure along with the change of water depth.
The floating offshore wind turbine foundation structure is a structure for supporting a wind turbine generator on the sea surface. The traditional floating type wind turbine foundation structure in China is only suitable for being installed within 100 meters of water depth, the power of a carrying fan is not more than 10MW, for example, a three gorges leading-in number floating type offshore wind power platform structure in Guangdong Yangjiang sea area adopts a three-upright semi-submersible type floating foundation, a bottom triangle and a top Y-shaped combined structure, the fan is positioned on one upright post, the whole system is leveled by ballasting, and the carrying fan with the power of 5.5MW is carried, is 28 kilometers offshore and is installed at the position with the water depth of 30 meters; the floating type offshore wind power platform structure with the 'hand shaking number' in Zhanjiang sea area adopts a three-upright semi-submersible type floating foundation, the top and the bottom are both triangular combined structures, a fan is positioned on one upright, the whole system is leveled by ballasting, and a 6.2MW fan is carried and installed at the position of about 65 meters of offshore average water depth.
The design difficulty of the deep-sea floating fan platform in the deep-sea area with the average water depth of more than 100 meters is more difficult: on one hand, the main scale design of the floating type fan foundation directly determines the steel consumption of the floating body, is a main factor influencing the economy of the whole fan project, and also directly causes that the response analysis of the floating body under the combined actions of deep sea wave flow, fan load, mooring force and the like is more difficult, and the analysis difficulty of the structural strength is improved; the other aspect is to the unique technical requirement of floating fan, and high-grade typhoon resistance requirement, carry on 16MW and above large capacity fan and lead to fan load to be bigger and bigger, and the work technical requirement is higher and higher, and the requirements such as anti-capsizing ability, location mooring ability, stability to the body are higher. It is therefore highly desirable to design a floating wind turbine foundation that is suitable for use in deep open sea areas having an average water depth of 100 meters and above.
Disclosure of Invention
The utility model aims at solving the technical problems that an economic semi-submersible type offshore floating fan foundation is developed for deep sea areas with the average water depth of 100 meters and more, and the economic semi-submersible type offshore floating fan foundation has the advantages of good hydrodynamic performance, high typhoon-resistant grade, high capacity of carrying a 16MW or more fan, strong anti-capsizing capability, good stability, structural strength meeting the requirements of integrated design of pneumatic-hydrodynamic-mooring and the like of the fan, low weight of a unit megawatt steel structure, high power generation efficiency, good economical efficiency and the like.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides an offshore floating fan foundation, includes many peripheral stands, a center stand, support member and mooring chain, the periphery of center stand is through support member installs the peripheral stand, wherein:
the peripheral upright posts are arranged in an outward inclined mode, the peripheral upright posts are divided into an upper section, a middle section and a lower section along the height direction of the peripheral upright posts, the cross section area of the middle section is larger than that of the lower section, the upper section is higher than the water plane, the middle section is arranged in the water plane, and the lower section is lower than the water plane;
the bottom of each peripheral upright post is connected with a floating body with a ballast tank inside, the floating bodies are horizontally arranged, and the centers of the floating bodies are vertically and cross-connected with the central upright post.
Preferably, the inclination angle of the peripheral upright post is 15-30 degrees.
Preferably, the number of the peripheral upright posts is three, the floating body is of a Y-shaped structure with three branches, the structural forms of the branches are the same, the included angles of the adjacent branches are 120 degrees, and the tail ends of the branches are respectively provided with one peripheral upright post.
Preferably, the branches comprise straight section pontoons and cylindrical section pontoons, the peripheral columns being mounted on the cylindrical section pontoons.
Preferably, the support member comprises an upper support member and a lower diagonal support member.
Preferably, the middle section is connected with the upper section or the lower section through a transition section, and the cross section area of the transition section is of a gradual change structure.
Preferably, the mooring chain is hung below the water plane of the middle section of the peripheral upright post.
Preferably, the lower part of the middle section is in the range of 3-5 meters below the water plane, and the upper part of the middle section is positioned in the range of 3 meters above the water plane.
Preferably, the diameter of the middle section is 1.2-1.8 times the diameter of the upper section or the diameter of the lower section.
Preferably, the center column comprises a first section, a second section, a third section and a fourth section which are sequentially arranged from top to bottom, the first section is of a double-shell structure comprising an outer shell and an inner shell, the outer shell is connected with the supporting member, the upper end of the inner shell is connected with a fan tower barrel, the lower end of the inner shell is connected with the upper end of the second section, the lower end of the second section is connected with the upper end of the third section in a telescopic manner, the lower end of the third section is connected with the fourth section, and the overall dimension of the fourth section is increased to form a pontoon.
The utility model mainly comprises a plurality of peripheral upright posts, a central upright post, a supporting member for connecting the peripheral upright posts and the central upright post and a bottom floating body, wherein the peripheral upright posts are obliquely and outwards arranged on the bottom floating body and are divided into an upper section, a middle section and a lower section along the height direction; the central upright post is vertically upwards installed, the top of the central upright post is designed into a double-shell structure, a high-capacity megawatt floating fan (16 MW and above) is installed at the top of the central upright post, a third section of the lower part of the central upright post is provided with a telescopic structure, and the cross section area of a fourth section of the central upright post is increased to be provided with a main ballast tank; the bottom floating body is connected with the central upright post by adopting a Y-shaped foundation base with three branches, the included angle of each branch is 120 degrees, 3 toe ends of the floating body are designed into round pontoons which are used as heave cabins, and inclined struts are adopted between peripheral upright posts above the base and the central upright post for connecting and supporting so as to keep the stability and the structural strength of the whole structure of the floating body.
The mooring system adopts a mooring cable arrangement scheme, a top mooring chain is installed and connected on three peripheral upright posts which incline outwards gradually and is below a water plane, a bottom mooring chain is connected to a submarine anchor pile by adopting a shared anchor scheme, a floating fan foundation group can be provided with corresponding anchor piles according to arrangement, and adjacent floating bodies can share anchor pile foundations.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The floating fan foundation provided by the utility model has the advantages of high overall comprehensive performance, simple and compact structural layout, higher structural utilization rate, simple construction, low manufacturing cost and good economy, and can effectively reduce the steel consumption of the floating fan foundation per megawatt;
(2) The support structure between the peripheral upright post and the central upright post and the Y-shaped structure matched with the base floating body can ensure that the total strength of the floating body structure meets the standard requirement, and the whole floating body foundation can resist the highest-grade typhoon and wave loads of 100 meters and more, mooring and other integrated load requirements;
(3) According to the large-diameter double-shell structure at the upper part of the central upright post, the outer shell is convenient for the connection and welding construction of the supporting structure between the peripheral upright post and the central upright post, the inner shell of the central upright post is in continuous butt joint with the base of the fan tower barrel, and the structural strength of the base of the fan tower barrel is convenient to ensure;
(4) The peripheral upright post is gradually inclined, so that the area moment of the water plane is increased along with the increase of the draft, the restoring moment is larger relative to the restoring moment of the vertical peripheral upright post when the floating foundation has a certain inclination angle, the defect of the drainage volume after the certain inclination angle can be compensated, the stability performance of the floating body is improved, and the draft can be conveniently adjusted according to the operation requirement during design;
(5) The local diameter of the upper and lower areas of the peripheral upright post draft water surface is increased, so that the volume of the water discharge can be gradually increased, the buoyancy is increased, the normal operation of a fan is ensured, and the extra buoyancy can be supplemented after a certain dip angle is formed on a floating foundation, so that the stability of inclined power generation is ensured, and the power generation efficiency is improved;
(6) The fan is arranged on the central upright post, and the ballast tank structure at the bottom of the central upright post can greatly reduce the gravity center of the floating body, so that the stability of the whole floating fan foundation is greatly improved;
(7) According to the utility model, a mooring cable arrangement scheme is adopted, 3x1,3x2,3x3 and other mooring schemes can be arranged according to actual needs, the mooring chains are installed and connected on three peripheral upright posts which incline outwards gradually, the connection points are below the water plane, corrosion of the mooring chains in long-term exposure air can be reduced, collision with a bottom structure is avoided, the ship is convenient to install and berth, and the fan power generation efficiency and the economy of a platform are improved by combining a shared anchor scheme;
(8) The central upright post structure below the floating body is inserted into the central upright post above the floating body, so that the floating fan foundation is convenient to dry-drag and install in batches.
(9) The floating type wind turbine foundation can be widely applied to deep sea areas such as south China sea, east China sea and the like, promotes the development of the floating type offshore wind power technology level in China, promotes the design innovation of the floating type offshore wind power, and particularly plays a positive pushing role in the design of the floating type offshore wind turbine foundation and the research and development of high-capacity offshore wind turbines.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic system diagram of an offshore floating wind turbine foundation of the present utility model.
Figure 2 is a side view of the offshore floating wind turbine foundation of the present utility model.
Fig. 3 is an isometric view of the offshore floating fan foundation of the present utility model.
FIG. 4 is a schematic view of the offshore floating fan foundation of the present utility model after construction is completed and before launch.
FIG. 5 is a schematic illustration of a batch dry hauler of an offshore floating fan foundation of the present utility model.
In the figure:
1- -a tower;
2-peripheral upright posts, 2-1-upper section, 2-4-lower section, 2-2-transition section and 2-3-middle section;
3-center column, 3-1-first section, 3-2-second section, 3-3-third section, 3-4-fourth section;
4-pontoon, 4-1-straight pontoon, 4-2-cylindrical pontoon;
5-support member, 5-1-upper support member, 5-2-lower diagonal bracing member;
6- -mooring chain;
7- -semi-submersible transport vessel.
Detailed Description
The utility model is further described below in connection with specific preferred embodiments, but it is not intended to limit the scope of the utility model.
For convenience of description, the relative positional relationship of the components, such as: the descriptions of the upper, lower, left, right, etc. are described according to the layout directions of the drawings in the specification, and do not limit the structure of the present patent.
As shown in fig. 1 to 3, an embodiment of the offshore floating fan foundation of the present utility model comprises three peripheral columns 2, a central column 3, floating bodies 4 serving as bases of the peripheral columns 2, supporting members 5 and mooring chains 6, wherein the three peripheral columns 2 are uniformly arranged on the periphery of the central column 3 through the supporting members 5, the upper ends of the central columns 3 are connected with a tower 1 with a large-capacity fan, each peripheral column 2 is connected with the mooring chain 6, and ballast tanks are respectively arranged on the peripheral columns 2, the central columns 3 and the floating bodies 4, thus forming an offshore floating fan installation platform.
The peripheral columns 2 in this embodiment are inclined outwards at an angle of 15-30 °, and the peripheral columns 2 are divided into an upper section 2-1, a middle section 2-3 and a lower section 2-4 along the height direction thereof, the diameters of the upper section 2-1 and the lower section 2-4 are the same, and the diameter of the middle section 2-3 is larger than the diameter of the upper section 2-1 or the lower section 2-4. Preferably, the diameter of the middle section 2-3 is 1.2-1.8 times of the diameters of the upper section 2-1 and the lower section 2-4, and the middle section 2-3 is respectively connected with the upper section 2-1 and the lower section 2-4 through a transition section 2-2 with gradually changed diameters. When the floating type draught fan is used, the upper section 2-1 of the peripheral upright post 2 is arranged higher than the water plane, the lower end of the middle section 2-3 is positioned in the range of 3-5 meters below the water plane, the upper end of the middle section 2-3 is positioned in the range of 3 meters above the water plane, and the lower section 2-4 is arranged lower than the water plane, so that the volume of water discharged after rising through the draught of the floating type draught fan is increased when the floating type draught fan foundation is inclined, and the stability and the power generation efficiency of the floating type draught fan are improved. In addition, the mooring chain 6 is hung on the part of the middle section 2-3 of the peripheral upright post 2, which is positioned below the water plane, so that the structure of the hanging part of the mooring chain is convenient to strengthen.
The central upright 3 of the present embodiment includes a first section 3-1, a second section 3-2, a third section 3-3 and a fourth section 3-4 which are connected in order from top to bottom. The first section 3-1 and the second section 3-2 are positioned above the floating body 4, and the third section 3-3 and the fourth section 3-4 are positioned below the floating body 4. The first section 3-1 is a double-shell structure comprising an outer shell and an inner shell, wherein the outer shell is connected with the supporting member 5, and the upper end of the inner shell is connected with the fan tower 1. The diameter of the outer shell is more than 3 meters greater than the diameter of the inner shell, i.e. there is at least a 1.5 meter wide space between the inner and outer shells, in order to facilitate the welding of the support members 5 between the outer shells of the peripheral uprights 2 and the central uprights 3. In order to facilitate the welding of the inner shell and the fan tower 1, the diameter of the inner shell is the same as that of the fan tower 1. The central upright post 3 adopts a double-shell structure to realize the installation of the supporting member 5 and the fan tower 1, can provide sufficient structural reinforcement and ensures the structural strength of the fan tower base. Also for simplicity of connection, in this embodiment, the inner shell is integrally formed with the second section 3-2, and the diameter of the inner shell is the same as that of the second section 3-2. In order to facilitate the towing transportation of the floating fan foundation, the lower end of the second section 3-2 is connected with the upper end of the third section 3-3 in a telescopic manner. In this embodiment, the diameter of the third section 3-3 is smaller than that of the second section 3-2, so that the upper end of the third section 3-3 can be pre-inserted into the lower end of the second section 3-2 by adopting a mechanical connection structure during towing transportation, and the third section 3-3 can be gradually slid down to a corresponding position by the mechanical connection structure after being transported to a working place. The ballast tank is arranged in the third section 3-3, the diameter of the fourth section 3-4 is increased to form a large-diameter pontoon, and the ballast contents and the ballast volume of the ballast tank and the pontoon can be adjusted according to the working water depth requirement so as to control the weight center of gravity of the whole pontoon, thereby greatly reducing the center of gravity of the pontoon, being beneficial to the stability of the whole floating fan foundation and reducing the motion response of the pontoon.
The floating body 4 of this embodiment is horizontally installed at the bottom of the second section 3-2 of the central upright 3, and the middle part of the floating body 4 is connected with the central upright 3, and the periphery of the floating body 4 extends to the bottom of the peripheral upright 2. The floating body 4 is of a Y-shaped structure with three branches, the structural forms of the branches are the same, and the included angle between the adjacent branches is 120 degrees. The branches comprise straight section pontoons 4-1 and cylindrical section pontoons 4-2, and the bottoms of the three peripheral upright posts 2 are respectively connected with one cylindrical section pontoon 4-2. In this way, the peripheral upright posts 2 and the central upright post 3 are connected into a whole through the floating body 4 and the supporting member 5, meanwhile, the peripheral upright posts 2 are connected to the deck of the floating body 4 and extend into the floating body 4 to be connected with the bottom plate of the floating body 4, so that the overall structural strength is improved, and a large-capacity fan with the size of 16MW or more can be carried. The permanent ballast tanks are designed in the floating body 4 and are matched with the ballast tanks arranged in the third section 3-3 and the fourth section 3-4 of the central upright post 3 to serve as main sources for controlling the stability of the floating body. The peripheral upright posts 2 are also internally provided with ballast tanks for assisting in adjusting ballast.
The support member 5 of this embodiment is composed of an upper support member 5-1 and a lower diagonal bracing member 5-2, the upper support member 5-1 is horizontally disposed between the upper section 2-1 of the peripheral upright 2 and the outer shell of the first section 3-1 of the center upright 3, the lower diagonal bracing member 5-2 is obliquely disposed between the lower section 2-4 of the peripheral upright 2 and the outer shell of the first section 3-1 of the center upright 3, wherein the number of the upper support member 5-1 and the lower diagonal bracing member 5-2 is increased according to the requirement of the overall strength of the structure, and the support form is also changed accordingly. So, be connected center stand 3 with support member 5 for peripheral stand 2, can improve the stability of the last fan tower section of thick bamboo base of center stand 3, reduce the response of fan vibration to the body structure, fully guarantee the intensity requirement of whole body structure.
According to the offshore floating type fan foundation floating body, a 3x2 (or 3x1,3x3 and the like) mooring arrangement scheme is adopted, the mooring chain 6 is hung at the position below the water plane of the middle section 2-3 of the peripheral upright post 2, corrosion of the mooring chain due to long-term exposure of air can be reduced, collision contact between the mooring chain 6 and the floating body 4 can be avoided by the inclined peripheral upright post 2, and berthing installation at an installation position is guaranteed. In addition, the middle section 2-3 of the peripheral upright post 2 can have sufficient structural reinforcement space below the water plane, so that the local strength requirement of the mooring chain 6 on the structure is met.
In the aspect of the construction and transportation and installation of the offshore floating fan foundation of the embodiment, the peripheral upright posts 2, the central upright posts 3, the pontoons 4 and the supporting members 5 can be constructed in a segmented manner, after the third section 3-3 and the fourth section 3-4 of the central upright posts 3 are constructed in a segmented manner, the peripheral upright posts 2, the first section 3-1, the second section 3-2 and the supporting members 5 are gradually folded by inserting the peripheral upright posts 2, the first section 3-4 and the supporting members 4 into the pontoons 4 through the mechanical connecting device, as shown in fig. 4, and taking the bottom pontoons 4 as the reference. After the whole body is launched, the third section 3-3 and the fourth section 3-4 of the central upright post 3 are matched with ballast to slide downwards through a mechanical device, and a whole ship inclination test is carried out. And finally, transporting the assembled whole floating body to a mounting terminal for complete machine mounting of the wind turbine tower 1, dry towing the floating body in batches by using a semi-submersible transport ship 7 as shown in fig. 5, or wet towing the floating body to the mounting terminal for mounting of the wind turbine tower 1 as shown in fig. 4, then, towing the whole floating wind turbine platform system to a working sea area by adopting the bottom floating body 4 matched with the lower half sections 3-3 and 3-4 of the upright posts 3 as main ballasts and the inside of the peripheral upright posts 2 as auxiliary ballasts to the towing draft of the whole floating wind turbine platform system, and lowering the third section 3-3 and the fourth section 3-4 of the central upright post 3 to corresponding positions according to the draft condition of the working sea area, and configuring the ballastdraft according to the stability calculation requirement, and carrying out mooring positioning mounting with the shared anchor system which is mounted in advance, thereby completing the in-place mounting of the whole floating wind turbine system.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model shall fall within the scope of the technical solution of the present utility model.
Claims (10)
1. The utility model provides an offshore floating fan foundation, includes many peripheral stand (2), a center stand (3), support member (5) and mooring chain (6), the periphery of center stand is through support member installs peripheral stand, its characterized in that:
the peripheral upright posts are arranged in an outward inclined mode, the peripheral upright posts are divided into an upper section (2-1), a middle section (2-3) and a lower section (2-4) along the height direction of the peripheral upright posts, the cross sectional area of the middle section is larger than that of the lower section, the upper section is higher than the water plane, the middle section is arranged in the water plane, and the lower section is lower than the water plane;
the bottom of each peripheral upright post is connected with a floating body (4) with a ballast tank inside, the floating body is horizontally arranged, and the center of the floating body is vertically and cross-connected with the central upright post.
2. The offshore floating wind turbine foundation of claim 1, wherein the peripheral upright is inclined at an angle of 15-30 °.
3. The offshore floating type fan foundation according to claim 1, wherein the number of the peripheral upright posts is three, the floating body is of a Y-shaped structure with three branches, the structural forms of the branches are the same, the included angle between every two adjacent branches is 120 degrees, and the tail end of each branch is provided with one peripheral upright post.
4. An offshore floating wind turbine foundation according to claim 3, wherein the branches comprise straight pontoons (4-1) and cylindrical pontoons (4-2), the peripheral columns being mounted on the cylindrical pontoons.
5. Offshore floating wind turbine foundation according to claim 1, wherein the support members comprise an upper support member (5-1) and a lower diagonal support member (5-2).
6. The offshore floating wind turbine foundation of claim 1, wherein the middle section is connected with the upper section or the lower section through a transition section, and the cross-sectional area of the transition section is in a gradual change structure.
7. The offshore floating wind turbine foundation of claim 1, wherein the mooring chain is suspended below the water plane of the midsection of the peripheral column.
8. The offshore floating wind turbine foundation of claim 1, wherein the lower portion of the middle section is located within 3-5 meters below the water plane and the upper portion of the middle section is located within 3 meters above the water plane.
9. The offshore floating wind turbine foundation of claim 1, wherein the diameter of the middle section is 1.2-1.8 times the diameter of the upper section or the diameter of the lower section.
10. The offshore floating type fan foundation of claim 1, wherein the central upright post comprises a first section, a second section, a third section and a fourth section which are sequentially arranged from top to bottom, the first section is of a double-shell structure comprising an outer shell and an inner shell, the outer shell is connected with the supporting member, the upper end of the inner shell is connected with a fan tower drum, the lower end of the inner shell is connected with the upper end of the second section, the lower end of the second section is connected with the upper end of the third section in a telescopic manner, the lower end of the third section is connected with the fourth section, and the overall dimension of the fourth section is increased to form a pontoon.
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| CN202320331677.8U CN219220634U (en) | 2023-02-28 | 2023-02-28 | Marine floating type fan foundation |
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| CN202320331677.8U CN219220634U (en) | 2023-02-28 | 2023-02-28 | Marine floating type fan foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117128142A (en) * | 2023-10-09 | 2023-11-28 | 中国电力工程顾问集团有限公司 | Method and device for transporting mud floating type offshore wind turbine system |
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2023
- 2023-02-28 CN CN202320331677.8U patent/CN219220634U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117128142A (en) * | 2023-10-09 | 2023-11-28 | 中国电力工程顾问集团有限公司 | Method and device for transporting mud floating type offshore wind turbine system |
| CN117128142B (en) * | 2023-10-09 | 2024-02-13 | 中国电力工程顾问集团有限公司 | Method and device for transporting mud floating type offshore wind turbine system |
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