CN211223767U

CN211223767U - Mooring system structure for floating foundation

Info

Publication number: CN211223767U
Application number: CN201921720090.6U
Authority: CN
Inventors: 白奇炜; 李华祥; 蒋勇
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-08-11
Anticipated expiration: 2029-10-11

Abstract

The utility model discloses a mooring system structure for floating foundation, this mooring system structure includes suction pile, first rotating part, second rotating part, third rotating part, the lower extreme of suction pile is used for fixing on the seabed, the first end of first rotating part articulates the upper end of suction pile, and first rotating part is freely rotatable around the axial of suction pile, the second end of first rotating part articulates with the first end of second rotating part along first articulated central line, the first end of third rotating part articulates with the second end of second rotating part along second articulated central line, the second end of third rotating part articulates in the bottom of floating foundation along third articulated central line; the first hinge central line, the second hinge central line and the third hinge central line are parallel to each other and are all perpendicular to the axis of the suction pile. The mooring system structure effectively solves the problems that the conventional steel anchor chain mooring system is difficult to moor and arrange in the sea area, high in construction cost and the like.

Description

Mooring system structure for floating foundation

Technical Field

The utility model relates to a mooring system structure for floating formula basis.

Background

In recent years, in the process of developing and utilizing wind energy in renewable energy sources by human beings, wind turbines are gradually shifted from onshore to offshore, and gradually go from offshore to deep open sea. In the process, various forms of offshore floating type fan foundations emerge, and among them, four types of floating type fan foundations, such as a single column type, a semi-submersible type, a tension leg type and a ship type, are most common.

At present, the research and development capability and investment of the floating type fan foundation in western countries, particularly European countries are far ahead of China. Among them, the most representative types of floating wind turbine foundations, for example, the Hywind (single column foundation) developed by norwegian national oil company (Statoil), are composed of a lower floating body with a diameter of 14.4m and a transition section with a diameter of 7.5m, the upper part of the transition section bears the tower and the wind turbine, the overall structure is simple, and the mooring system thereof adopts three half-tensioning multipoint distributed mooring systems provided by MacGregor company for positioning. WindFloat (semi-submersible foundation) developed by principlelepower in the united states, which is composed of three vertical columns with a diameter of about 10m, the vertical columns are connected and reinforced through cross braces and inclined braces, a hexagonal thin plate structure is arranged at the bottoms of the vertical columns to serve as a heave plate, a mooring system of the foundation adopts Gama98 mooring ropes of DM20 series of Dyneema company, the number of the mooring ropes is three, and the foundation is positioned by using a multipoint distributed mooring mode in the form of a catenary. The floating foundation (tension leg foundation) developed by SBM offset, of france for use in PGL Offshore wind farm projects is in the form of a truss, wherein the part for connecting the mooring system is three circular section columns, on which chain locking devices are mounted, and the floating foundation is mainly used for positioning the wind turbine foundation in a tensioned state by the mooring system through the chain tensioning device and the chain locking device (the gravity of the foundation is much less than the buoyancy). The floating type fan foundation is composed of a buoy shaped like a Chinese character 'hui', adopts a Damping Pool technology to realize a roll reduction function, and also adopts a traditional distributed multi-point mooring system for positioning.

In summary, for the current european offshore floating wind farm project, the conventional manner of matching the platform type variety used in the conventional marine oil and gas development with the conventional mooring system is used, and it should be said that the conventional manner is the mainstream manner of offshore floating wind power in the future development.

Compared with European countries, China is still in a lagging position temporarily in the development of offshore wind power plants, and the foundation form adopted by offshore wind power plants is mainly fixed foundations such as single piles, jackets, high pile bearing platforms and the like, and a floating foundation is not put into use temporarily. In addition, if related designs and technologies which are directly introduced into Europe on the basis of the floating fan are adopted, the cost is high, and for a transitional water depth (shallow water) area of the offshore area currently developed in China, if the conventional steel anchor chain is adopted to moor and arrange the basis of the floating fan, the mooring radius is very large (usually 8-10 times or more of the water depth), the overall development cost of the floating fan is greatly improved, and the arrangement of a large-scale mooring system is easy to interfere with the arrangement of submarine cables, so that the difficulty and the cost of the arrangement of the trend of the submarine cables are increased.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to arrange the defect that the degree of difficulty is big, with high costs in order to overcome among the prior art the basic mooring system of floating, provide a mooring system structure for floating formula basis.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

a mooring system structure for a floating foundation is characterized by comprising a suction pile, a first rotating part, a second rotating part and a third rotating part, wherein the lower end of the suction pile is used for being fixed on a seabed, the first end of the first rotating part is hinged to the upper end of the suction pile, the first rotating part can freely rotate around the axial direction of the suction pile, the second end of the first rotating part is hinged to the first end of the second rotating part along a first hinge center line, the first end of the third rotating part is hinged to the second end of the second rotating part along a second hinge center line, and the second end of the third rotating part is hinged to the bottom of the floating foundation along a third hinge center line;

the first hinge central line, the second hinge central line and the third hinge central line are parallel to each other and are all perpendicular to the axis of the suction pile.

In the scheme, by adopting the structural form, the mooring system structure can position the semi-submersible floating foundation of the fan to realize the wind vane effect, so that the floating foundation platform has the capability of automatically adjusting the orientation, and can capture and utilize wind energy to the maximum extent by matching with a yaw system on the fan; simultaneously because the existence of wind vane effect, the environmental load that makes the floating formula basis receive through the automatic adjustment of azimuth can greatly reduced, and this lightweight design that will realize the floating formula basis. Meanwhile, the mooring system structure can effectively solve the problems of large mooring arrangement difficulty, high installation and construction cost and the like of the conventional steel anchor chain mooring system in the sea area with the transition water depth (shallow water), so that the possibility of using the floating type fan in batch in the sea area with the transition water depth (shallow water) along the shore in China is greatly increased.

Preferably, the second rotating portion includes a first hinge rod and a second hinge rod that are parallel to each other, the first hinge rod and the second hinge rod are connected by a connecting rod, the length of the first hinge rod is smaller than that of the second hinge rod, the first hinge rod is hinged to the second end of the first rotating portion, and the second hinge rod is hinged to the first end of the third rotating portion.

In this scheme, adopt above-mentioned structural style, the second rotating part adopts simple connecting rod to constitute, simple structure, low in manufacturing cost.

Preferably, the third rotating part includes two connecting rods with the same structure, two same ends of the connecting rods are respectively hinged to two ends of the second hinge rod, and the other ends of the two connecting rods are hinged to the bottom of the floating foundation.

Preferably, a counterweight block is arranged on the second hinge rod, and the counterweight block is of a cylindrical structure.

In this scheme, adopt above-mentioned structural style, the balancing weight can reduce the range that floats about the floating formula basis in aqueous, increases the stability of floating formula basis.

Preferably, a support column is installed at an upper end of the suction pile, and a first end of the first rotating part is hinged to the support column.

In this scheme, adopt above-mentioned structural style, simple structure is convenient for install first rotating part.

Preferably, the suction pile is arranged on the floating foundation and positioned on the windward side of the fan blade.

In this scheme, adopt above-mentioned structural style, conveniently according to the environmental load (wind, unrestrained, class etc.) that the floating foundation receives the wind vane effect of the azimuth of adjustment floating foundation, with the cooperation of conventional fan driftage system make the fan major structure on the floating foundation can catch the angle that wind energy efficiency is the highest.

Preferably, the floating foundation comprises a central upright column and at least three side upright columns arranged in the circumferential direction of the central upright column, two adjacent side upright columns are connected through a first connecting piece, and each side upright column is connected with the central upright column through a second connecting piece.

In this scheme, adopt above-mentioned structural style, the structure of floating formula basis is a class triangle-shaped structure on the whole, and the central stand that is located central point puts mainly plays the effect of bearing fan and pylon, and the side stand mainly increases the holistic weight that bears of floating formula basis, can keep the equilibrium of floating formula basis in aqueous simultaneously.

Preferably, a floating cylinder is arranged between the lower end of the central upright column and the lower end of each side upright column, and two ends of the floating cylinder are respectively connected to the central upright column and the side upright columns.

In this scheme, adopt above-mentioned structural style, the flotation pontoon is in order to increase the holistic weight that bears of floating formula basis.

Preferably, the bottom of each of the central columns and the side columns is provided with a heave plate, and the periphery of the heave plate extends out of the side wall of the central column or the side column along the radial direction.

In the scheme, the heaving plate is arranged for increasing the damping of the floating foundation in the heaving direction so as to reduce the movement of the floating foundation in the heaving direction.

Preferably, a plurality of sub-chambers are arranged inside the central upright post and each side upright post, and the sub-chambers are used for placing ballast to adjust the bearing weight of the floating foundation.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in: the mooring system structure of the utility model can position the semi-submerged floating foundation of the fan, realize the wind vane effect, make the floating foundation platform have the ability of automatically adjusting the orientation, cooperate with the yawing system on the fan, can catch and utilize the wind energy to the greatest extent; simultaneously because the existence of wind vane effect, the environmental load that makes the floating formula basis receive through the automatic adjustment of azimuth can greatly reduced, and this lightweight design that will realize the floating formula basis. The mooring system structure can effectively solve the problems of large difficulty in mooring arrangement, high installation and construction cost and the like of a conventional steel anchor chain mooring system in a transition water depth (shallow water) sea area, and greatly increases the possibility of using the floating type fan in batch in the coastal transition water depth (shallow water) sea area in China.

Drawings

Fig. 1 is a schematic structural diagram of a mooring system according to a preferred embodiment of the present invention.

Fig. 2 is a schematic structural view of the floating foundation according to the preferred embodiment of the present invention.

Fig. 3 is a schematic view of the mooring system structure according to the preferred embodiment of the present invention in use.

Description of reference numerals:

fan tower 100

Floating foundation 200

Mooring system arrangement 300

Sea level 400

Sea bed 500

Suction pile 1

Support column 101

First rotary part 2

Second rotating part 3

First hinge lever 301

Second hinge lever 302

Connecting rod 303

Third rotary part 4

Connecting rod 401

Counterweight 5

Center column 6

Side column 7

First connecting member 8

Second connecting piece 9

Buoy 10

Heave plate 11

Detailed Description

The present invention is further illustrated by the following examples, but is not intended to be limited thereby within the scope of the following examples.

As shown in fig. 1, the utility model discloses a mooring system structure for floating foundation, this mooring system structure 300 includes suction pile 1, first rotating part 2, second rotating part 3, third rotating part 4, the lower extreme of suction pile 1 is used for fixing on seabed 500, the first end of first rotating part 2 articulates in the upper end of suction pile 1, and first rotating part 2 is freely rotatable around the axial of suction pile 1, the second end of first rotating part 2 is articulated with the first end of second rotating part 3 along first articulated central line, the first end of third rotating part 4 is articulated with the second end of second rotating part 3 along second articulated central line, the second end of third rotating part 4 is articulated in the bottom of floating foundation 200 along third articulated central line; the first hinge central line, the second hinge central line and the third hinge central line are parallel to each other and are all perpendicular to the axis of the suction pile 1.

The mooring system structure 300 can position the semi-submersible floating foundation 200 of the fan to realize a wind vane effect, so that the floating foundation 200 platform has the capability of automatically adjusting the orientation, and can capture and utilize wind energy to the maximum extent by matching with a yaw system on the fan; meanwhile, due to the existence of the wind vane effect, the environmental load on the floating foundation 200 can be greatly reduced through the automatic adjustment of the azimuth angle, and the lightweight design of the floating foundation 200 can be realized. Meanwhile, the mooring system structure 300 can effectively solve the problems of large mooring arrangement difficulty, high installation and construction cost and the like of the conventional steel anchor chain mooring system in the sea area with the transition water depth (shallow water), and the possibility of using the floating type fan in batch in the sea area with the transition water depth (shallow water) along the shore in China can be greatly increased.

In this embodiment, the supporting column 101 is installed at the upper end of the suction pile 1, the first rotating part 2 is made of a steel rod, hinged rotating joints are respectively arranged at two ends of the steel rod, the hinged rotating joint at one end of the steel rod is hinged to the supporting column 101, the second rotating part 3 comprises a first hinged rod 301 and a second hinged rod 302 which are parallel to each other, the first hinged rod 301 and the second hinged rod 302 are connected through a connecting rod 303, the length of the first hinged rod 301 is smaller than that of the second hinged rod 302, the first hinged rod 301 is hinged to the hinged rotating joint at the other end of the steel rod of the first rotating part 2, and the second hinged rod 302 is hinged to the first end of the third rotating part 4. The third rotating portion 4 includes two connecting rods 401 having the same structure, the same ends of the two connecting rods 401 are respectively hinged to both ends of the second hinge rod 302, and the other ends of the two connecting rods 401 are hinged to the bottom of the floating base 200. The mooring system structure 300 is formed by hinging simple steel frame structures, and has simple structure and convenient manufacture.

In order to reduce the amplitude of the floating foundation 200 floating up and down in the water and increase the stability of the floating foundation 200, a cylindrical structural weight 5 is provided on the second hinge rod 302.

When the mooring system structure 300 is used in cooperation with the floating foundation 200, the suction pile 1 is disposed on the floating foundation 200 on the windward side of the fan blade. Therefore, the wind vane effect of the azimuth angle of the floating foundation 200 can be conveniently adjusted according to the environmental load (wind, wave, current and the like) borne by the floating foundation 200, and the wind vane effect is matched with a conventional wind turbine yaw system to enable the wind turbine main body structure on the floating foundation 200 to capture the angle with the highest wind energy efficiency.

As shown in fig. 2, in the present embodiment, the floating foundation 200 includes a central upright 6 and three side uprights 7 disposed in the circumferential direction of the central upright 6, two adjacent side uprights 7 are connected by a first connecting member 8, and each side upright 7 is connected with the central upright 6 by a second connecting member 9. A buoy 10 is arranged between the lower end of the central upright post 6 and the lower end of each side upright post 7, and two ends of the buoy 10 are respectively connected to the central upright post 6 and the side upright posts 7. The central upright post 6 is connected with the side upright posts 7 through a buoy 10 with a larger diameter and a cross brace (a second connecting piece 9) which is positioned above the buoy and also has a smaller diameter and a circular cross section, and the three side upright posts 7 are connected with each other through an upper row and a lower row of smaller cross braces (a first connecting piece 8) with circular cross sections.

The floating foundation 200 is a triangular structure as a whole, the cross section of the central upright 6 at the central position is circular, the central upright 6 mainly plays a role of bearing a fan and a tower, a certain number of sub-cabins are arranged in the central upright 6, the other three side uprights 7 are circular cross-section uprights, and the three side uprights 7 are connected with the central upright 6 through a buoy 10 at the lower part and a cross brace (a second connecting piece 9) at the upper part. The floating foundation comprises a buoy 10 and side columns 7, a certain number of sub-cabins are arranged in the side columns 7, the side columns 7 mainly increase the overall bearing weight of the floating foundation 200, and meanwhile the balance of the floating foundation 200 in water can be kept. Buoy 10 is intended to increase the overall bearing weight of floating foundation 200. The inner compartments of the three side columns 7, the central column 6 and the three pontoons 10 all serve to store ballast (ballast water or other liquid, solid ballast) and the ballast is adjusted so that the entire floating foundation 200 structure can bear the weight of the fan and tower to be carried. In other embodiments, the number of the side columns 7 may be four, five, etc., and the structure of the central column 6, the side columns 7 and the buoy 10 may be other structures besides cylindrical structures, such as cylindrical structures with hexagonal cross sections, etc., as required.

The bottom of the central upright post 6 and the bottom of each side upright post 7 are respectively provided with a heave plate 11, and the periphery of the heave plate 11 extends out of the side wall of the central upright post 6 or the side upright post 7 along the radial direction. The heave plate 11 is provided to increase damping of the floating foundation 200 in the heave direction to reduce movement of the floating foundation 200 in the heave direction. The heave plate 11 may be a thin plate of circular cross-section, an annular outer ring extension plate or the like that surrounds the bottom of the center post 6 and each side post 7.

The second rotating part 3 and the third rotating part 4 plane contained angle that links to each other with shoals (first connecting piece 8) of floating basis 200 are 90 degrees, because whole effect that receives external load, after adjusting the azimuth through the rotary joint of this mooring system structure 300, because fan power generation in-process, the wind wheel receives the drift that wind load effect produced the downwind direction, relative rotation will take place between the plane of second rotating part 3 and third rotating part 4, whole process will be at the 90 degrees contained angles from initial condition to the reciprocal change between the 180 degrees contained angles of final condition.

Fig. 3 is a schematic view of the mooring system structure according to the preferred embodiment of the present invention in use. The mooring system structure 300 is generally used for the fan floating foundation with the transition water depth (30-50m) in China. This floating foundation 200 will be based on using suction pile 1 as the anchor point on the whole, adopts steelframe hinge structure, connects between floating foundation 200 and suction pile 1 to reach the effect of conventional "anchor chain", and enable the whole rotation of surrounding suction pile 1 of floating fan. Compared with the existing floating fan foundation in the conventional form and the conventional steel mooring system, the mooring system structure 300 is mainly characterized in that:

1. the floating foundation 200 can freely rotate around the suction pile 1 at the bottom under the combined action of external environmental loads such as wind, wave, current and the like, so that the overall direction of the floating fan can be automatically adjusted, and the overall wind vane effect of the floating fan is realized;

2. the wind vane effect and the conventional fan yaw system enable the main structure of the fan to always capture the angle with highest wind energy efficiency;

3. the thin plate type heave plates 11 are arranged at the bottoms of the four upright posts of the floating foundation 200, so that the damping of the whole floating foundation 200 in the heave direction is increased, and the movement and the acceleration in the heave direction can be correspondingly reduced;

4. after the mooring system structure 300 achieves the weathervane effect, the mooring system structure has the advantages that the environmental load on the floating foundation 200 can be reduced to a great extent, which has a positive effect on the overall structural strength of the floating foundation 200;

5. because the floating foundation 200 is used in the sea area with the transitional depth (shallow water), the shallow water effect is very obvious, and compared with the floating foundation 200 with the same structural form in the sea areas with the middle and deep water, the motion response is more severe. In order to effectively control the overall motion response, if a conventional steel anchor chain is adopted, the arrangement radius of a mooring system can reach 8-10 times of the water depth, even higher, and the development cost is greatly increased; in addition, the arrangement of the mooring system in a large range interferes with the direction and arrangement of the submarine cables, increases the design and construction difficulty, and also increases the cost. If with the utility model provides a mooring system replaces conventional steel anchor chain mooring system, then can effectively solve above problem.

Use the utility model discloses a during mooring system structure 300, when the design floats formula basis 200, the suggestion of whole draft of floating formula basis 200 is no longer than 8m, and the whole displacement is no longer than 2500 t. The fan tower is arranged at the top of the central upright post 6, the overall height of the central upright post 6 is 12-14m, and the diameter of the central upright post 6 is about 8-10 m. The cross section of the three side columns 7 is circular, the height of the three side columns is the same as that of the central column 6, the diameter of the three side columns 7 is about 6-8m, the center distance between the three side columns 7 and the central column 6 is about 18-20m, and the three side columns 7 and the central column are connected through a lower buoy structure and an upper cross-brace structure which are circular in cross section. The three side upright posts 7 are connected with each other by upper and lower rows of cross sections of circular cross sections, the diameters of the cross sections of all the cross section structures do not exceed 1m, and the diameter of the buoy does not exceed 4 m. Thin plate type heave plates 11 with circular cross sections are arranged below base lines (keels) of the three side upright posts 7 and the central upright post 6, and a certain number of beams and ribs are arranged on the thin plate type heave plates to improve the structural strength of the thin plate type heave plates.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. A mooring system structure for a floating foundation is characterized by comprising a suction pile, a first rotating part, a second rotating part and a third rotating part, wherein the lower end of the suction pile is used for being fixed on a seabed, the first end of the first rotating part is hinged to the upper end of the suction pile, the first rotating part can freely rotate around the axial direction of the suction pile, the second end of the first rotating part is hinged to the first end of the second rotating part along a first hinge center line, the first end of the third rotating part is hinged to the second end of the second rotating part along a second hinge center line, and the second end of the third rotating part is hinged to the bottom of the floating foundation along a third hinge center line;

2. Mooring system structure for a floating foundation according to claim 1, wherein the second rotating part comprises a first and a second hinge rod parallel to each other, the first and the second hinge rod being connected by a connecting rod, the first hinge rod having a smaller length than the second hinge rod, the first hinge rod being hinged to the second end of the first rotating part, the second hinge rod being hinged to the first end of the third rotating part.

3. Mooring system structure for a floating foundation according to claim 2, wherein the third swivel part comprises two structurally identical connecting rods, the same ends of which are hinged to the two ends of the second hinge rod, respectively, and the other ends of which are hinged to the bottom of the floating foundation.

4. A mooring system structure for a floating foundation as claimed in claim 2 wherein the second hinged rod is provided with a clump weight, the clump weight being of cylindrical configuration.

5. A mooring system structure for a floating foundation as claimed in claim 1, wherein the suction pile has a support upright mounted at an upper end thereof, and the first rotating part has a first end hinged to the support upright.

6. Mooring system arrangement according to any of claims 1-5, wherein the suction pile is arranged on the floating foundation on the side of the fan blade facing the wind.

7. The mooring system structure of claim 1, wherein the floating foundation comprises a central column and at least three side columns arranged at the periphery of the central column, adjacent two of the side columns are connected by a first connecting member, and each of the side columns is connected with the central column by a second connecting member.

8. A mooring system structure for a floating foundation as claimed in claim 7 wherein a pontoon is disposed between the lower end of the center column and the lower end of each of the side columns, the pontoons being connected at each end to the center column and the side columns.

9. The mooring system structure for a floating foundation according to claim 7, wherein the center post and each of the side posts are provided at the bottom thereof with heave plates, the circumference of which extend in the radial direction beyond the side walls of the center post or the side posts.

10. A mooring system structure for a floating foundation as claimed in any one of claims 7-9 wherein the center column and each of the side columns are provided with a plurality of compartments within the interior thereof for receiving ballast to adjust the weight of the floating foundation.