CN215323199U - An offshore floating wind power base platform - Google Patents
An offshore floating wind power base platform Download PDFInfo
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- CN215323199U CN215323199U CN202121182331.3U CN202121182331U CN215323199U CN 215323199 U CN215323199 U CN 215323199U CN 202121182331 U CN202121182331 U CN 202121182331U CN 215323199 U CN215323199 U CN 215323199U
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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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
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- 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
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- 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
本实用新型公开了一种海上浮式风电基础平台，涉及船舶及海洋工程技术领域，包括中央网箱模块，所述中央网箱模块用于放置风电设备，所述中央网箱模块的外侧围绕有至少一层附连网箱模块，所述附连网箱模块包括若干附连网箱结构，各所述附连网箱结构均与所述中央网箱模块通过铰接结构铰接，相邻的所述附连网箱结构之间均通过所述铰接结构铰接。本实用新型的海上浮式风电基础平台以中央网箱模块为中心、周围连接附连网箱模块群的整体不仅是一个完整的海上浮式风电基础平台，同时也是“海上牧场”的养殖基地。
The utility model discloses an offshore floating wind power basic platform, which relates to the technical field of ships and marine engineering. The utility model comprises a central cage module, which is used for placing wind power equipment. At least one layer of attached cage modules, the attached cage module includes several attached cage structures, each of the attached cage structures is hinged with the central cage module through a hinge structure, and the adjacent cage structures are hinged. The attached cage structures are all hinged by the hinge structure. The offshore floating wind power basic platform of the utility model is not only a complete offshore floating wind power basic platform, but also a breeding base for "sea pastures", with the central cage module as the center and the surrounding connected cage modules.
Description
Technical Field
The utility model relates to the technical field of ships and ocean engineering, in particular to an offshore floating type wind power foundation platform.
Background
The vigorous development of offshore wind power is a trend of current wind power development. The wind power generation completely utilizes the energy of the nature, has no pollutant discharge and lower operation cost, and is the ideal energy at present. Particularly, the wind power station is built at sea, and has the characteristics of abundant wind power resources and high utilization rate.
At present, the offshore wind power development technology has a big bottleneck problem. The space close to the sea surface is influenced by 'rough elements' such as surface waves or sea surface waves, the wind speed is small, the wind speed is large at high altitude, and the wind power and the height from the ground generally change in a logarithmic or exponential rate; in addition, under a certain wind speed, the power of wind power generation is approximately in direct proportion to the square of the diameter of a wind wheel, so the diameter of the wind wheel is increased as much as possible, for a horizontal axis fan, the wind wheel needs to be placed very high, and the height of a tower is increased, on one hand, the bending moment of the fan on the ground is very large (for example, an 8MW wind motor, the height of the tower is up to 163m, and at the limit wind speed, the limit bending moment on the ground is up to 2.08 ten thousand tons of meters); on the other hand, the underwater part of the foundation is subjected to the impact of sea waves, the structure of the wind power platform is required to be strong, the tower is fixed on the sea, and a firm offshore pile foundation is also required to be built. According to the current state of the art, offshore wind power plants are mainly located in offshore continental stands and intertidal zones. This project is difficult to construct in shallow sea and intertidal zones near the seaside. Large cranes and crane ships are difficult to get close to under low tide and have high use cost, small construction equipment needs to excavate cofferdams, and the efficiency is too low. And offshore construction has very high safety requirements on life and equipment, so that the cost of the offshore wind power foundation device is high and is greatly higher than that of a land wind turbine.
The deep open sea is obviously the most abundant area of wind resources. Due to the difficulties with the conventional offshore (piled) wind foundations today, it is natural to think of developing floating wind foundation systems. Nowadays, technicians in ocean engineering generally think that the device is suitable for water depth sea areas with the depth of more than 40m and can avoid difficult areas for coastal beach construction. The main application forms at present are single pile type, semi-submersible type, tension leg Type (TLP), barge type, catamaran type and the like, wherein the semi-submersible type is most widely applied. The equipment capable of carrying wind power equipment is commonly called as a floating tool. The existing various floating tools have a common characteristic that one floating tool is used for simultaneously solving the problems of buoyancy and stability of large-scale wind power equipment. Because the gravity center of the offshore wind power equipment is very high, the development of offshore floating wind power also increases a technical bottleneck, namely the stability problem of the floating tool. This makes the cost prohibitive for the floating offshore infrastructure even more problematic.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an offshore floating type wind power foundation platform, which is used for solving the problems in the prior art, providing a stable foundation for wind power equipment and reducing the cost.
In order to achieve the purpose, the utility model provides the following scheme:
the utility model provides an offshore floating type wind power foundation platform which comprises a central net cage module, wherein the central net cage module is used for placing wind power equipment, at least one layer of attached net cage module surrounds the outer side of the central net cage module, the attached net cage module comprises a plurality of attached net cage structures, each attached net cage structure is hinged with the central net cage module through a hinge structure, and adjacent attached net cage structures are hinged through the hinge structures.
Preferably, the central net cage module comprises a central net cage platform, a first net cage structure is arranged around the outer side of the central net cage platform, the central net cage platform is connected with the first net cage structure through a plurality of first connecting net cages, and each first connecting net cage is hinged with the central net cage platform and the first net cage structure through a hinge structure; a first breeding area is formed among the first connecting net cage, the first net cage structure and the central net cage platform.
Preferably, the first net cage structure comprises a plurality of first standard net cages which are sequentially hinged through the hinge structures, and an anti-collision structure is arranged between every two adjacent first standard net cages.
Preferably, the central net cage platform is used for placing wind power equipment, an upper building is arranged between the central net cage platform and the wind power equipment, the upper building comprises a plurality of floors, a tower seat is arranged at the top of the upper building, and the tower seat is used for placing the wind power equipment.
Preferably, the central net cage platform comprises an inner net cage structure and an outer net cage structure, the outer net cage structure is arranged outside the inner net cage structure, a plurality of second connecting net cages are arranged between the inner net cage structure and the outer net cage structure, the plurality of second connecting net cages are hinged with the inner net cage structure and the outer net cage structure through the hinge structures, and anti-collision structures are arranged between the plurality of second connecting net cages and the inner net cage structure and the outer net cage structure; a second breeding area is formed among the inner net cage structure, the outer net cage structure and the second connecting net cage.
Preferably, the attached net cage structure comprises a plurality of second standard net cages, adjacent second standard net cages are hinged through the hinge structures, and anti-collision structures are arranged between the adjacent second standard net cages.
Preferably, a plurality of the second standard net cages of each of the attached net cage structures form a grid-shaped structure, a plurality of the second standard net cages in the middle are in a cross-shaped structure, and each of the attached net cage structures is divided into a plurality of third culture areas by the plurality of the second standard net cages in the middle.
Preferably, said attached cage modules comprise at least two layers, and said attached cage structures of adjacent layers are hinged by said hinge structures.
Preferably, the hinge structure comprises two bollards, a cable is wound between the two bollards, and the cable is fixed through a locker.
Preferably, the offshore floating wind power foundation platform further comprises an anchoring module, and the anchoring module is arranged below the attached net cage module.
Compared with the prior art, the utility model has the following technical effects:
the offshore floating wind power foundation platform takes the central net cage module as the center, and the whole of the peripheral connecting and attaching net cage module group is not only a complete offshore floating wind power foundation platform, but also a culture base of an offshore pasture.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of an offshore floating wind power foundation platform of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of the offshore floating wind power foundation platform of the present invention (omitting the mooring module);
FIG. 4 is a schematic view of the superstructure and tower connection of the present invention;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a top view of the central cage module and the attached cage modules of the present invention;
FIG. 7 is a top plan view of the central cage module of the present invention;
FIG. 8 is a top view of the central cage platform of the present invention;
FIG. 9 is a top view of the attachment cage structure of the present invention;
fig. 10 is a schematic view of a first standard cage, a first connecting cage, a second standard cage or a second connecting cage of the present invention;
FIG. 11 is a schematic view of the connection of the central cage platform to the second connecting cage of the present invention;
fig. 12 is a side view (first orientation) of a first standard cage attachment of the present invention;
fig. 13 is a side view (second orientation) of a first standard cage attachment of the present invention;
FIG. 14 is a top view of a first standard cage connection of the present invention;
FIG. 15 is a top view of a first standard cage connection at a corner of the present invention;
FIG. 16 is a top view of the hinge structure connection of the present invention;
FIG. 17 is a front view of the hinge structure of the present invention;
FIG. 18 is a schematic view of the forces applied to the articulating modular netbox set of the utility model;
wherein: 100-offshore floating wind power foundation platform, 1-central net cage module, 2-wind power plant, 3-attached net cage module, 4-attached net cage structure, 5-hinged structure, 6-central net cage platform, 7-first net cage structure, 8-first connecting net cage, 9-first breeding area, 10-first standard net cage, 11-crashproof structure, 12-superstructure, 13-tower base, 14-inner net cage structure, 15-outer net cage structure, 16-second connecting net cage, 17-second breeding area, 18-second standard net cage, 19-third breeding area, 20-bollard, 21-cable, 22-lock, 23-tower, 24-net cage body, 25-floating box, 26-reinforced beam, 27-anchoring module, 28-netting body, 29-weight, 30-transition platform and 31-flange.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The utility model aims to provide an offshore floating type wind power foundation platform, which is used for solving the problems in the prior art, providing a stable foundation for wind power equipment and reducing the cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
As shown in fig. 1-18: the embodiment provides an offshore floating wind power foundation platform 100, which comprises a central net cage module 1, wherein the central net cage module 1 is used for placing wind power equipment 2, at least one layer of attached net cage modules 3 surrounds the outer side of the central net cage module 1, each attached net cage module 3 comprises a plurality of attached net cage structures 4, each attached net cage structure 4 is hinged with the central net cage module 1 through a hinge structure 5, and adjacent attached net cage structures 4 are hinged through the hinge structures 5.
Specifically, in this embodiment, the central net cage module 1 includes a central net cage platform 6, a first net cage structure 7 is wound around an outer side of the central net cage platform 6, an outer dimension of the first net cage structure 7 is 110m × 110m, the central net cage platform 6 is connected with the first net cage structure 7 through a plurality of first connection net cages 8, an excess platform 30 is arranged outside the central net cage platform 6, the excess platform 30 is hinged with the first connection net cages 8 through a hinge structure 5, the embodiment includes 4 groups of first connection net cages 8 which are uniformly distributed, each group includes 2 first connection net cages 8, and each first connection net cage 8 is hinged with the central net cage platform 6 and the first net cage structure 7 through the hinge structure 5; a first breeding area 9 is formed among the first connecting net cage 8, the first net cage structure 7 and the central net cage platform 6, specifically, a netting body 28 is arranged on the inner side of the first connecting net cage 8, one side of the first net cage structure 7 and the outer side of the central net cage platform 6, and a plurality of heavy hammers 29 are connected to the lower end of the netting body 28.
In this embodiment, the central cage platform 6 is made of steel (or concrete) material, and the central cage platform 6 mainly plays a role in bearing the weight of the wind power equipment 2 and accessories and bearing part of the stability function of the floating body. The first connecting net cage 8 and the first net cage structure 7 have the same structure, and the number of the first connecting net cage 8 and the first net cage structure 7 is 26, the number of the first connecting net cage 8 and the first net cage structure 7 is 12 in longitudinal (x direction) connection, and the number of the first connecting net cage 8 and the first net cage structure 7 is 14 in transverse (y direction) connection.
In this embodiment, the first net cage structure 7 includes a plurality of first standard net cages 10 sequentially hinged through the hinge structures 5, and an anti-collision structure 11 is disposed between adjacent first standard net cages 10.
In this embodiment, the central cage platform 6 is used for placing the wind power equipment 2, the superstructure 12 is arranged between the central cage platform 6 and the wind power equipment 2, the superstructure 12 comprises a plurality of floors, a tower base 13 is arranged at the top of the superstructure 12, and the tower base 13 is used for placing the wind power equipment 2. A deck is arranged on the central net cage platform 6, the superstructure 12 comprises a plurality of rooms, and personnel cabins, control rooms, duty rooms, offices, meeting rooms, research rooms, storage cabins, signal equipment and the like can be arranged in the superstructure 12 according to requirements. The space below the deck may be used to provide ballast tanks, and if desired, also tanks. The equipment in the engine room comprises a generator set, a bilge pump, a general distribution board, a control room, a fuel oil cabin, a whole ship piping system, various auxiliary equipment related to ships and wind power and the like.
The central net cage platform 6 is integrally rectangular, square, boat-shaped or other shapes, if the central net cage platform 6 is boat-shaped, the central net cage platform is convenient to be dragged and moved on the water surface, the bow of the boat is generally opposite to the incoming wind direction with the largest wind force or the largest probability, the central net cage platform 6 of the embodiment is circular, the central net cage platform 6 comprises an inner net cage structure 14 and an outer net cage structure 15, the outer net cage structure 15 is arranged on the outer side of the inner net cage structure 14, a plurality of second connecting net cages 16 are arranged between the inner net cage structure 14 and the outer net cage structure 15, the plurality of second connecting net cages 16 are hinged with the inner net cage structure 14 and the outer net cage structure 15 through hinge structures 5, and anti-collision structures 11 are arranged between the plurality of second connecting net cages 16 and the inner net cage structure 14 and the outer net cage structure 15; a second breeding area 17 is formed among the inner net cage structure 14, the outer net cage structure 15 and the second connecting net cage 16, specifically, a netting body 28 is arranged on the outer side of the inner net cage structure 14, the inner side of the outer net cage structure 15 and one side of the second connecting net cage 16, and the lower end of the netting body 28 is connected with a plurality of heavy hammers 29.
In this embodiment, the number of the attached net cage structures 4 is 8, each of the attached net cage structures 4 includes a plurality of second standard net cages 18, adjacent second standard net cages 18 are hinged through a hinge structure 5, and an anti-collision structure 11 is arranged between adjacent second standard net cages 18. In this embodiment, there are 30 second standard cages 18 in each attachment cage structure 4, 14 longitudinally (y-direction) connected and 16 transversely (x-direction) connected. The outer dimensions of the attached net cage structure 4 are 110m by 110 m. The function of the attached net cage module 3 is to ensure the stability performance of the whole offshore floating wind power foundation platform 100.
In this embodiment, the total number of the first standard net cages 10, the first connecting net cages 8, and the second standard net cages 18 of the offshore floating wind power foundation platform 100 is 26+30 × 8 — 266, and the external size of the offshore floating wind power foundation platform 100 is 330m × 330 m.
In this embodiment, the second standard net cages 18 form a grid-shaped structure, the middle second standard net cages 18 are in a cross-shaped structure, the attachment net cage structure 4 is divided into a plurality of third culture areas 19 by the middle second standard net cages 18, one side of each second standard net cage 18 corresponding to each third culture area 19 is provided with a netting body 28, and the lower ends of the netting bodies 28 are connected with a plurality of weights 29.
In this embodiment, the hinge structure 5 includes two bollards 20, the two bollards 20 are respectively fixed on the adjacent net cages, a cable 21 is wound between the two bollards 20, and the cable 21 is fixed by a locking device 22. The mooring ropes 21 comprise two groups, and the upper part is a common mooring rope with the diameter of 40mm, and the upper part is an emergency mooring rope with the diameter of 60 mm.
In this embodiment, the offshore floating wind power foundation platform 100 further includes an anchoring module 27, and the anchoring module 27 is disposed below the attached net cage module 3. Specifically, the structure of the anchoring module 27 should be selected according to the position of the sea area where the offshore floating wind power foundation platform 100 of the present embodiment is located and the characteristics of the soil texture of the sea bottom. The anchor module 27 can be designed according to a conventional method of ship outfitting design specifications, namely, the outfitting number is calculated according to the displacement and the wind area of each module system, the weight of an anchor and the size and diameter of an anchor chain are determined, and a catenary theory is adopted for verification. In the embodiment, the artificial fishing reef is arranged on the seabed for anchoring so as to ensure the stability of the offshore floating wind power foundation platform 100.
In this embodiment, the first standard net cage 10, the first connecting net cage 8, the second standard net cage 18 and the second connecting net cage 16 have the same structure, and each of the first standard net cage, the second standard net cage and the second connecting net cage 16 includes a net cage body 24, a buoyancy tank 25 is disposed in the net cage body 24, and a reinforcing beam 26 is disposed on the buoyancy tank 25.
The offshore floating wind power foundation platform 100 of the embodiment takes the central net cage module 1 as the center, and the whole of the peripheral connected net cage module 3 group is not only a complete offshore floating wind power foundation platform 100, but also a culture base of a marine ranch.
The basic principle of the embodiment is as follows:
the essence of the embodiment is a "group" offshore floating wind power vessel. In the embodiment, the weight of the wind power equipment 2 is borne by the central net cage module 1, and the problem that the stability requirement of the wind power equipment 2 with a particularly high gravity center height is particularly high is solved by the central net cage module 1 and the attached net cage module 3. The central net cage module 1 and the attached net cage module 3 are combined, so that the safety and the low cost of the wind power equipment 2 can be ensured. The dual-purpose wind power generation device has the advantages that the dual-purpose wind power generation device can stably bear the wind power generation device 2, the cultivation of a marine ranch can be carried out, and the investment is not needed to be carried out by spending too much cost.
In addition, in order to solve the construction problem of the wind motor on the sea, the wind power equipment 2 and the central net cage module 1 can be regarded as a whole, 2 barges are pre-bound on two sides of the central net cage module 1 as a floating tool after being manufactured in a shipbuilding factory (special extra-large installation ship is not needed), and the floating tool can be pulled to a preset place for positioning by using a towing wheel during tide rising and then connected with the pre-combined attached net cage module 3 to complete the whole site positioning. Therefore, the construction and installation cost can be greatly saved, and the safety risk of offshore construction operation can be reduced.
Theoretical basis of the hinged net cage group:
the central cage module 1 and the attachment cage modules 3 form an articulated cage group, and an "articulation theory" is derived according to the general knowledge of the ship principle. Properly combining the hinged net cages to form a group, and bearing a transverse tilting moment M by one of the net cagesfWhen in use, the transmission function of the hinged chain can ensure that the connected net cages generate the restoring moment M which can balance the heeling momentq. The following formula can be obtained according to the initial stability theory of the ship principle:
in the formula:
Δi-displacement of the ith vessel in t;
GMithe initial stability of the ith ship is high in m;
θi-inclination of the i-th vessel in degrees.
By the above formula, if a group of net cages (n) are hinged to each other in a certain way, and some net cages (m) bear external disturbance torque in the same direction under the condition of small inclination angle, the gunwale will generate the same vertical displacement for the group of net cages, and the sum of the disturbance torque is assumed to be sigmam jMfjThis value will equal the sum sigma of the restoring moments generated by the group of net cagesn iMqi. Alternatively, if there are a group of hinged cages, of which 1 (which may be called "central cage") is subjected to a disturbing moment (for example, the installation of the wind power installation 2), causing the central cage to tilt, all the hinged cages (group) will tilt, generating a restoring moment, in addition to the restoring moment generated by the central cage. This phenomenon may also be considered as "torque transfer", or "torque transfer". As if one person in a "group" were stressed, all people were under common stress.
The initial stability of the 3 box-in-box set of boxes with hinged net cages as shown in fig. 18 will now be studied. The 3 net cages are respectively numbered as the first and the second. Assume that the 3 net cages are rigidly hinged at A, B two points. The concept of rigid articulation is: the two objects to be hinged are only allowed to rotate around the hinge point, but not to separate, and there is the same vertical displacement up and down of the adjacent 2 cages at the hinge point.
Supposing that a wind pressure tilting moment M acts on No. two net cagesfThen 3 net cages are in the moment M of heelingfUnder the action of the (1), the net cage is inclined clockwise, and the inclination angle is theta1The net cage is inclined counterclockwise due to the downward acting force around the hinge point, and the inclination angle is theta2In the same way, the No. net cage is inclined clockwise with an inclination angle theta3. The gunwale moves up and down, the port side moves upwards, the starboard side moves downwards, and the moving amount is f; assume tilt angle theta1、θ2、θ3Are all very small, i.e. have a width of B1For the same reason, the width of the second and third lines is B2、B3Thus, there are:
Sinθ1＝f/(B1/2)≈tanθ1≈θ1
Sinθ2＝f/(B2/2)≈tanθ2≈θ2
Sinθ3＝f/(B3/2)≈tanθ3≈θ3
or: f ═ B1/2)×Sinθ1＝(B2/2)×Sinθ2＝(B3/2)×Sinθ3
Note that at the overturning moment Mf1Under the action, 3 net cages are all inclined, so that a restoring moment M is generatedq1、Mq2、Mq3. From the initial stability formula:
Mq1＝△1×h1×sinθ1
in the formula: delta1、h1The net cages with the numbers of (i) are high in water discharge and initial stability.
The same principle is as follows:
Mq2＝△2×h2×sinθ2
Mq3＝△3×h3×sinθ3
because 2 box with a net are connected to the pin joint, make it produce same displacement f, consequently have:
Mf1＝△1×h1×sinθ1+△2×h2×sinθ2+△3×h3×sinθ3
or if there are n hingedly connected net cages, it can also be written:
substituting: sin thetai＝f/(Bi/2)＝2f/Bi
Or
After f is found, the respective inclination angles can be found:
the static inclination angle of the ith net cage in the net cage group is as follows: thetai＝arcsin(2×f/Bi)
Similarly, it can be proved that if n net cages are hinged to bear m wind pressure tilting moments, the gunwale displacement f generated by the net cages can be written as the following formula:
if each net cage is subjected to wind pressure tilting moment MfjThe total (maximum) wind pressure tilting moment can be borneCan be written as:
∑Mfj＝2×f×∑(Δi×hi/Bi)
or written in the general form:
∑Mfj＝2×∑(Δi×hi×f/Bi)
here, it is necessary to describe this formula in a bit:
this formula illustrates that if a group of net cages are hinged to each other in a certain way, some net cages will be subjected to external disturbing moments in the same direction, and the gunwale will have the same vertical displacement for the group of net cages under the condition of small inclination angle, and the sum sigma M of the disturbing momentsfjWill equal the sum of the restoring moments generated by the group of cages. In other words, if only 1 net cage of a group of hinged net cages is subjected to an interference torque (for example, wind power equipment is installed), the net cage is inclined, a restoring torque is generated, and as a result, all the hinged net cages (a net cage group) are inclined, and the restoring torque is generated. This phenomenon can also be considered as "transfer of torque", or "transmission of torque".
From this, the following calculation can also be derived:
for the net cages bearing the wind pressure tilting moment, also called central net cages, the inclination angle is usually not allowed to be too large, and in order to ensure safety, the inclination angle in the hinged net cages is not allowed to make the deck enter water, and the deck water entry angle theta is0iIt can be written that:
θ0i＝ARCTAN(Fi/(Bi/2))
in the formula: fi-freeboard of a certain cage; b isiWidth of a ship
If the deck immersion angle of getting central box with a net as the biggest inclination angle that this box with a net combination body allowed, then the whole biggest wind pressure heeling moment that can allow of this box with a net is:
here, the average initial stability height GM of the ship combination is proposedjDefining:
flexibility coefficient of hinged net cage assembly
If the hinge structure of the adjacent net cages is made of flexible bodies, such as steel ropes, nylon cables, springs, rubber and other materials which are allowed to have certain deformation, when the central net cage tilts under the action of wind pressure tilting moment, the displacements of the side edges of the two adjacent net cages are unequal, and the hinge form is not rigid connection any longer and can be called flexible hinge. For example, when the central net cage is under the action of wind pressure tilting moment, the displacement of the gunwale is f1And the displacement of the adjacent net cages linked by the acting force of the central net cage is f2The ratio of the two, namely: f. of2And f1The ratio of the two is called the hinge flexibility factor, namely:
ε＝f2/f1
when f is2＝f1When epsilon is 1, i.e. rigid hinge, and if f2If 0, then e is 0, then the connection is called fully flexible, and in practice it can be considered that 2 cages have been separated. The displacement of the central net cage has no influence on the adjacent net cages; in practice, rigid hinging conditions are rare.
In this case, when two adjacent net cages are connected by a steel cable, if the steel cable is too long and exceeds the displacement of the water entry angle of the deck of the central net cage, the condition can be considered as the condition that epsilon is 0.
The flexibility factor of two adjacent net cages can also be expressed as follows:
ε＝ε0*ε1
in the formula: epsilon0-the flexibility factor of the cage design or new cage state measured by the tilt test;
ε1and modifying the coefficient by changing the flexibility coefficient caused by the net cage in the using process.
In actual net cage products, a flexible connection is formed by a steel cable (or a nylon cable, which is collectively called a rope) and an elastic collision pad (such as rubber, a used tire or an inflatable berth-alongside ball), the flexibility coefficient of the flexible connection is usually measured by an inclination test method after the net cage is launched into water, and the flexibility coefficient is usually selected to be more proper within the range of epsilon 0.25-0.75.
In practical use, the flexibility coefficient can be changed by properly adjusting the specification and the size of the connecting cable and the elastic coefficient of the inflatable berthing ball (or the old tire) until the application requirement is met.
The offshore floating wind power foundation platform 100 of the embodiment has strong wind and wave resistance, and is suitable for shallow sea areas of coastal continental shelves or intertidal zones in China with the water depth of 20-100 m under the condition that a breakwater is not used, and is particularly suitable for fjord straits in Fujian province and sea areas rich in wind resources in south China sea.
One of the characteristics of coastal waters is that extreme disastrous weather such as typhoon occurs frequently. The "safety design wind level" of the offshore floating wind power foundation platform 100 of this embodiment is determined to be 47.8m/s (class 15) for 50 years and 66.9m/s (class 18.5) for 50 years. Under the huge wind level, the offshore floating wind power foundation platform 100 of the embodiment can ensure that the wind power equipment 2 can keep stable position and is not overturned.
In order to fully utilize abundant fishery and wind power resources in far and deep sea, the establishment of a marine ranch mainly comprising breeding industry in a proper sea area is considered, and the arrangement of a large-scale floating offshore wind power station in far and deep sea can be realized by redesigning and effectively combining an articulated net cage module carrying wind power equipment, a tower 23 and accessory equipment.
The offshore floating wind power foundation platform 100 of the embodiment is applied to the wind power equipment 2 with the capacity of 8MW (8000kW), specifically as follows:
TABLE 1 basic data of a wind power plant 2
TABLE 2 wind power plant 2 operating characteristic parameter platform and sea area wind speed used
The wind power equipment 2 is suitable for vast sea areas of Taiwan strait Fujian quan, which is the open sea, the position of the Taiwan strait Fujian quan is about 118-120 degrees of east diameter, and 22-26.5 degrees of north latitude (the calculation example is 25 degrees N, and the coefficient of the global autorotation Coriolis force is f is 0.22). The sea area is a multi-typhoon water area of Taiwan strait.
Calculating water depth in sea area: the method is suitable for the sea area of the China coastal continental shelf (including intertidal zone); the average water depth in the vast sea area in the middle of the Taiwan strait was calculated and designed to be 50 m.
TABLE 3 ultimate boundary load of foundation provided by manufacturer of wind power plant 2
Attached table 4 offshore floating wind power base platform 100 computing
The central net cage module 1 is formed by net cage units with the size of 19m × 9m, and a square net cage module with the size of 110m × 110m is formed, as shown in fig. 10, the horizontal direction is the length direction of the net cage, the length of the net cage body 24 is 19m, the vertical direction is the width direction of the net cage, the length of the net cage body 24 is 9m, the length of the anti-collision structure 11 is 1.5m, the width of the anti-collision structure 11 is 0.5m, that is, the size of the first standard net cage 10, the size of the first connecting net cage 8 and the size of the second connecting net cage 16 are 19m × 9m, and the overall size of the overall structure in fig. 10 is 20m × 10 m.
Attached table 5 cage unit parameter calculation for central cage module 1
The overall size of the offshore floating wind power foundation platform 100 is 330 × 330m, and the attached net cage modules 3 are still formed by using 19m × 9m standard net cage units, that is, the size of the second standard net cage 18 is 19m × 9m, and the overall size of the overall structure in fig. 10 is 20m × 10 m. When calculating the longitudinal or transverse waterline area and the inertia moment of the net cage unit, the size of the net cage body 24 is used, namely, the calculation is carried out according to 19m by 9 m. For the square net cage modules of 110m by 110m, whether for the central net cage module 1 or for the attached net cage structure 4, the net cage units with the external shape length larger than 20m (but the external shape width is 10m) are arranged in the longitudinal direction or the transverse direction, and the calculation should be considered separately, but in the whole net cage, most of the net cage units with the net cage body 24 length of 19m are arranged, the longitudinal length is the minimum, and when the longitudinal inertia moment is calculated, the calculation is biased to safety by using smaller dimension substitution, so that the calculation can be uniformly carried out by using the length of 19m in the sense of approximate calculation.
Calculation of parameters of net cage units of attached net cage structure 4 with additional tables 6110 m x 110m
From the above brief calculations, the following conclusions can be drawn:
the total weight of the fan + tower 23+ ancillary equipment is not less than 1979.7 tons (nearly 2000 tons); the maximum design ship list moment reaches about 2.08 ten thousand tons of meters.
According to the design of the embodiment, when a marine ranch (for cultivation) of nearly 10 hectares (100000 square meters) is built, the floating offshore wind power station can be built without needing to increase the investment of about 800 ten thousand RMB, deep sea piling and renting an ultra-large offshore wind power installation vessel for construction, the cost of the wind power foundation building is reduced by about 80%, and the safety risk of offshore construction is reduced. This is the great economic value of this patent.
The offshore floating wind power foundation platform 100 of the embodiment is adopted to construct a 92.5m x 91.5m about 8500m2The platform carries out culture operation, 4 leisure platforms with 22m by 11m are arranged around the platform for tourists to travel at sea, and the platform is an innovative attempt for combining two industries of ocean culture and leisure travel and is used for further developing ocean accumulation experience in the future.
The offshore floating wind power foundation platform 100 is adopted under the ocean stormy waves condition, the characteristics that bending moment and torque which are born by buildings on the sea surface in stormy waves can be greatly reduced by mainly utilizing the hinged connection of ocean buildings, the strength and the fatigue resistance are relatively improved, meanwhile, the steel cable is used as a hinged element, the tilting moment of a ship (net cage) can be caused by 'transmission', the overturning moment of the ship (net cage) is dispersed in a plurality of ships (net cages) to bear, the wind wave resistance stability of the ship (net cage) is improved, and the safety of ocean culture and ocean engineering buildings is ensured.
The embodiment aims at the specific demonstration of the design of the meizhou island mariculture and leisure platform: the area of the net cage unit composed of 14 net cage units 22m by 11m is nearly 8500m2The annular culture leisure platform adopts the offshore floating type wind power basic platform 100 of the embodiment, and results of strict calculation show that in 14-level typhoon (the wind speed reaches 43.79m/S, and the wind pressure is 1174N/m2) Under sea conditions of, floating at seaThe safety of the wind power base platform 100 can be fully guaranteed.
Due to the special structure of the offshore floating wind power foundation platform 100, the offshore floating wind power foundation platform has the characteristics of wave resistance and earthquake resistance in offshore floating engineering, and is likely to be widely applied to the construction of large offshore floating buildings (such as large offshore wind power platforms, offshore floating airports and the like).
Example two
The difference between this embodiment and the first embodiment is: in this embodiment the attached cage modules 3 comprise at least two levels, with the attached cage structures 4 of adjacent levels being hinged by means of hinge structures 5.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
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