CN111794915A

CN111794915A - Floating type foundation and offshore wind power generation equipment

Info

Publication number: CN111794915A
Application number: CN202010688108.XA
Authority: CN
Inventors: 张黎; 张友林; 白奇炜; 李华祥; 马文勇
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2020-10-20

Abstract

The invention discloses a floating foundation and offshore wind power generation equipment, wherein the floating foundation comprises a tower cylinder, a tower cylinder fixing frame and a first floating body, the tower cylinder is arranged on the tower cylinder fixing frame, the tower cylinder fixing frame is fixedly arranged above the first floating body, the floating foundation also comprises a second floating body, the second floating body is arranged along the circumferential direction of the tower cylinder fixing frame, and the outer periphery of the tower cylinder fixing frame is connected with the second floating body; the floating foundation further comprises a plurality of damping supporting pieces, the plurality of damping supporting pieces are arranged along the circumferential direction of the tower barrel, one end of each damping supporting piece is connected to the tower barrel, and one end of each damping supporting piece is connected to the second floating body. This float formula basis provides buoyancy through first body and second body for the tower section of thick bamboo and supports, and the effort that produces when the tower section of thick bamboo takes place to heave or roll can transmit for the second body through damping support piece, and the damping effect through damping support piece can slow down the vibration range of a tower section of thick bamboo to reduce the tower section of thick bamboo and take place the phenomenon of heaving or rolling by a wide margin.

Description

Floating type foundation and offshore wind power generation equipment

Technical Field

The invention relates to the field of offshore wind power generation, in particular to a floating foundation and offshore wind power generation equipment.

Background

With the increasing importance of environmental protection and renewable resource development and utilization all over the world, wind energy has been slowly developed from land to sea as a clean and renewable source, and particularly has great development potential in wide deep sea. Deep and open sea floating wind power is the trend and direction of large-scale development of offshore wind power, is also the hotspot of development and construction of offshore wind power plants in the world at present, and the floating foundation is considered to be a sharp instrument for the offshore wind power to move to deep sea in the world.

Because the floating foundation is floated in seawater, large heave is easy to occur under the action of wind and waves. In order to reduce the heave amplitude of the floating foundation, a heave plate is arranged below the floating foundation in the prior art, so that the heave of the floating foundation can be reduced to a certain extent. However, the tower has a high height, so that the tower will not only aggravate the heaving of the floating foundation but also generate the rolling phenomenon of the tower under the condition of large wind waves. Therefore, the stability of the floating foundation in water can be influenced, the normal operation of the fan at the top of the tower can be influenced, the fan is damaged, and the service life of the fan is shortened.

Disclosure of Invention

The invention provides a floating foundation and offshore wind power generation equipment to solve the defects in the prior art.

The invention solves the technical problems through the following technical scheme:

a floating foundation comprises a tower, a tower fixing frame and a first floating body, wherein the tower is mounted on the tower fixing frame, the tower fixing frame is fixedly arranged above the first floating body, the floating foundation further comprises a second floating body, the second floating body is arranged along the circumferential direction of the tower fixing frame, and the outer periphery of the tower fixing frame is connected with the second floating body;

the floating foundation further comprises a plurality of damping supporting pieces, the damping supporting pieces are arranged along the circumferential direction of the tower barrel, one end of each damping supporting piece is connected to the tower barrel, and one end of each damping supporting piece is connected to the second floating body.

In this scheme, adopt above-mentioned structural style, provide buoyancy through first body and second body for a tower section of thick bamboo and support, the effort that produces when a tower section of thick bamboo takes place to heave or roll can transmit for the second body through damping support piece, and the vibration range of a tower section of thick bamboo can be slowed down to damping effect through damping support piece to reduce a tower section of thick bamboo and take place by a wide margin to heave or roll the phenomenon.

Preferably, the damping support is telescopic in the length direction, and the damping mechanism of the damping support provides damping when the damping support is telescopic.

In this scheme, adopt above-mentioned structural style for a tower section of thick bamboo is tensile or compression damping support piece when taking place to heave or roll, and then makes the second body maintain the relatively fixed position in aqueous all the time when the effort that receives a tower section of thick bamboo, reduces the fluctuation of second body, thereby can greatly reduced because of the second body fluctuates the condition emergence of the heaving of aggravating a tower section of thick bamboo.

Preferably, the ends of the damping support are hinged to the tower and/or the second buoyant body.

In this scheme, adopt above-mentioned structural style for when a tower section of thick bamboo passes through damping support piece and transmits the effort for the second body, there is certain rotation allowance between damping support piece and a tower section of thick bamboo and second body, reduces the stress damage of damping support piece's tip and a tower section of thick bamboo and second body junction.

Preferably, the floating foundation further comprises a sleeve, the sleeve is sleeved on the tower barrel, and a plurality of connecting parts used for connecting the damping supporting pieces are arranged on the circumference of the sleeve.

In this scheme, adopt above-mentioned structural style, the sleeve can be independent of a tower section of thick bamboo installation, avoids welded connection damping support piece's connecting portion on a tower section of thick bamboo, is convenient for connect installation damping support piece simultaneously.

Preferably, the second floating body is a flat structure.

In this scheme, adopt above-mentioned structural style, set the second body to flat structure for floating formula basis has the waterline face of great area, strengthens floating formula basis's antidumping stability.

Preferably, the body of the second floating body is made of an aluminum alloy or a non-metallic material.

In this scheme, adopt above-mentioned structural style, the main part of second body is by the light-duty material that the density is less relatively such as aluminum alloy or non-metallic material, not only can further increase the waterline face of floating formula basis, still makes the second body keep lighter weight to do not have too big influence to the low center of gravity position of floating formula basis, strengthened the anti-overturning stability nature of floating formula basis greatly.

Preferably, the floating foundation further comprises a ballast tank connected with the tower mount or the first buoyant body by a rigid member.

In this scheme, adopt above-mentioned structural style, the ballast tank is except providing buoyancy for floating formula basis, under the limited prerequisite of floating formula basis draft, can also the biggest reduction float the focus on formula basis, strengthens floating formula basis's restoring force stationarity.

Preferably, the ballast tank is a flat structure, and a plurality of chambers for loading the filler are arranged in the ballast tank.

In this scheme, adopt above-mentioned structural style, make the ballast tank flat structure, can make the ballast tank act as and hang down the board, reduce the floating formula basis and hang down and swing in the stormy waves, strengthen its stability.

Preferably, the second floating body is formed by assembling and fixing a plurality of floating pieces.

In this scheme, adopt above-mentioned structural style, be convenient for make and transport, reduce cost.

Preferably, the floating piece comprises a first floating block and a second floating block, the side length of the first floating block is larger than that of the second floating block, and the first floating block is connected through the second floating block.

In this scheme, adopt above-mentioned structural style, when connecting first floating block and second floating block, only need through the second floating block of shorter length of side connect can, reduce the work load of connecting the installation.

Preferably, every two adjacent floating pieces are connected and fixed through a plurality of connecting assemblies.

In this scheme, adopt above-mentioned structural style, it is fixed that showy piece passes through a plurality of coupling assembling, and reinforcing joint strength avoids disintegrating under big stormy waves.

Preferably, the connecting assembly comprises a first connecting piece and a second connecting piece which are respectively and fixedly arranged on the two floating pieces, and the first connecting piece and the second connecting piece are connected through a third connecting piece.

Preferably, the floating foundation further comprises a mooring cable, one end of the mooring cable is fixed on the sea bottom, and the other end of the mooring cable is connected to the tower fixing frame or the first floating body.

In the scheme, the floating foundation is fixed in a specific area by adopting the structure form.

Preferably, the tower drum fixing frame comprises a first supporting beam, a second supporting beam and a connecting beam, the first supporting beam and the second supporting beam are fixed in a cross structure, and the end part of the first supporting beam and the end part of the second supporting beam are fixedly connected end to end through the connecting beam.

In this scheme, adopt above-mentioned structural style, reduce the steel quantity, reduce the whole weight and the cost of floating formula basis.

Preferably, the tower fixing frame further comprises a plurality of reinforcing members, the plurality of reinforcing members are distributed along the circumferential direction of the tower, one side of each reinforcing member is fixed to the first support beam or the second support beam, and the other side of each reinforcing member is fixed to the outer side wall of the tower.

In this scheme, adopt above-mentioned structural style, use the reinforcement can stabilize a tower section of thick bamboo, the rigidity and the joint strength of reinforcing a tower section of thick bamboo and tower section of thick bamboo mount junction.

An offshore wind power plant comprising a wind turbine and a floating foundation as described above, the wind turbine being mounted on the tower.

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

The positive progress effects of the invention are as follows: the floating foundation provides buoyancy support for the tower drum through the first floating body and the second floating body, acting force generated when the tower drum is in heave or roll is transmitted to the second floating body through the damping support piece, and the vibration amplitude of the tower drum is reduced through the damping effect of the damping support piece, so that the phenomenon that the tower drum is in heave or roll to a large extent is reduced.

Drawings

Fig. 1 is a schematic structural view of a floating foundation according to a preferred embodiment of the present invention.

Fig. 2 is a front view of the floating foundation in the preferred embodiment of the present invention.

FIG. 3 is a top view of the floating foundation in the preferred embodiment of the present invention.

Fig. 4 is a schematic structural view of a second floating body according to a preferred embodiment of the present invention.

Fig. 5 is a schematic view of a connection structure of the second floating body in the preferred embodiment of the present invention.

Description of reference numerals:

tower drum 1

Tower drum fixing frame 2

Rigid member 3

Ballast tank 4

Second float 5

First floating block 51

Second floating block 52

Damping support rod 6

Sleeve 7

Reinforcing element 8

Mooring line 9

Connecting assembly 10

Fixing plate 101

Connecting plate 102

Connecting bolt 103

Fixing bolt 104

Sea surface A

Tower drum fixing frame mounting area B

Detailed Description

The present invention is further illustrated by the following specific examples, but is not limited thereby in the scope of the following examples.

As shown in fig. 1-3, the floating foundation according to the embodiment of the present invention includes a tower tube 1, a tower tube fixing frame 2, and a first floating body, wherein the tower tube 1 is mounted on the tower tube fixing frame 2, the tower tube fixing frame 2 is fixedly disposed above the first floating body, the floating foundation further includes a second floating body 5, the second floating body 5 is disposed along the circumferential direction of the tower tube fixing frame 2, and the outer periphery of the tower tube fixing frame 2 is connected to the second floating body 5; the floating foundation further comprises a plurality of damping support rods 6, the plurality of damping support rods 6 are arranged along the circumferential direction of the tower barrel 1, one ends of the damping support rods 6 are connected to the tower barrel 1, and one ends of the damping support rods 6 are connected to the second floating body 5.

This float formula basis provides buoyancy through first body and second body 5 for tower section of thick bamboo 1 and supports, and the effort that produces when tower section of thick bamboo 1 takes place to heave or roll can pass through damping bracing piece 6 and transmit for second body 5, and the damping effect through damping bracing piece 6 can slow down the vibration range of tower section of thick bamboo 1 to reduce tower section of thick bamboo 1 and take place heave or roll phenomenon by a wide margin.

In the present embodiment, the damping support rod 6 is retractable in the length direction, and the damping mechanism of the damping support rod 6 provides damping when the damping support rod 6 is retracted. Can make tower section of thick bamboo 1 tensile or compression damping bracing piece 6 when taking place to heave or roll like this, and then make second body 5 maintain the relative fixed position in the aquatic all the time when receiving the effort of tower section of thick bamboo 1, reduce the fluctuation of second body 5 to can the greatly reduced aggravate the situation emergence of the heave of tower section of thick bamboo 1 because of second body 5 fluctuates.

The ends of the two ends of the damping support rod 6 are respectively hinged with the tower 1 and the second floating body 5. When the hinged connection enables the tower barrel 1 to transmit acting force to the second floating body 5 through the damping support rod 6, a certain rotation allowance is reserved between the damping support rod 6 and the tower barrel 1 and the second floating body 5, and stress damage of the connection position of the end part of the damping support rod 6 and the tower barrel 1 and the second floating body 5 is reduced.

Of course, in other embodiments, one end of the damping support rod 6 may be hinged to the tower 1 or the second floating body 5, and the other end is fixedly connected; or the ends of the two ends of the damping support rod 6 are fixedly connected, and the rigidity of the joint is required to be increased.

As shown in fig. 1 and 2, the floating foundation of the present embodiment further includes a sleeve 7, the sleeve 7 is sleeved on the tower tube 1, and a plurality of connecting portions for connecting the damping support rods 6 are disposed on the sleeve 7 in the circumferential direction. The sleeve 7 can be installed independently of the tower barrel 1, the connecting part of the damping supporting rod 6 is prevented from being welded on the tower barrel 1, and meanwhile the damping supporting rod 6 is convenient to connect and install. When the device is installed, the sleeve 7 is fixed on the tower barrel 1, then the damping support rod 6 is connected, and then the damping support rod 6 is connected with the second floating body 5.

Of course, in other embodiments, the sleeve 7 may not be provided, and the connecting member may be welded directly to the outer surface of the tower 1 and connected to the damping support rod 6 through the connecting member. Or, the upper end of the damping support rod 6 is directly welded to the tower 1.

In this embodiment, the second floating body 5 is set to be a flat structure, so that the floating foundation has a larger area of a water plane, and the overturning resistance stability of the floating foundation is enhanced.

The body of the second floating body 5 is made of an aluminum alloy or a non-metallic material.

In this embodiment, the non-metallic material that the main part of second body 5 adopted can be the light-duty material that density is less relatively such as foam, rubber, not only has corrosion-resistant, and the steel volume is economized, and material cost low grade advantage can further increase the waterline face on floating formula basis for second body 5 keeps lighter weight, thereby does not have too big influence to the low gravity center position on floating formula basis, has strengthened the stability of overturning resistance on floating formula basis greatly.

The second floating body 5 can be integrally manufactured or formed by assembling and fixing a plurality of floating pieces. In order to facilitate manufacturing and transportation and reduce cost, the second floating body 5 of the present embodiment is assembled and fixed by a plurality of floating members. Specifically, referring to fig. 4, the floating member constituting the second floating body 5 includes a first floating block 51 and a second floating block 52, wherein the side length of the first floating block 51 is greater than that of the second floating block 52, that is, the first floating block 51 is a large floating block, and the second floating block 52 is a small floating block. The large floating blocks are connected through the small floating blocks. As shown in the figure, the first floating block 51 and the second floating block 52 are arranged in a square structure with a larger side and a smaller side, and when the first floating block 51 and the second floating block 52 are connected, the second floating block 52 with a shorter side is only needed to be connected, so that the workload of connection and installation is reduced.

The large floating block and the small floating block are fixedly connected through a plurality of connecting assemblies 10. As shown in fig. 5, the connecting assembly 10 includes a first connecting member fixed on the first floating block 51 and a second connecting member fixed on the second floating block 52, the first connecting member and the second connecting member each include a fixing plate 101 and a connecting plate 102, the fixing plate 101 and the connecting plate 102 are vertically disposed, the fixing plates 101 of the first connecting member and the second connecting member are fixed on the first floating block 51 and the second floating block 52 through fixing bolts 104, and the connecting plates 102 of the first connecting member and the second connecting member are disposed in parallel and fixedly connected through connecting bolts 103.

In order to reinforce the large floating block and the small floating block, the side face of the small floating block is set to be a semi-cylindrical protrusion, the side face of the large floating block is a semi-cylindrical groove which is correspondingly matched with the side face of the small floating block, the semi-cylindrical protrusion of the small floating block can be fixedly clamped and inserted into the semi-cylindrical groove of the large floating block, and a gap formed by connecting the side faces of the large floating block and the small floating block is filled with adhesive for reinforcement. Through the combination of the connecting assembly 10 and the clamping fixation, the multiple floating pieces of the second floating block 52 can be effectively prevented from being disintegrated under the condition of high wind and waves.

Of course, in other embodiments, the structure and size of the floats may be the same.

As shown in fig. 1 and 2, the floating foundation further includes a ballast tank 4, and the ballast tank 4 is connected to the tower mount 2 or the first buoyant body through a rigid member 3. The ballast tank 4 can not only provide buoyancy for the floating foundation, but also reduce the gravity center of the floating foundation to the maximum extent and enhance the restoring force stability of the floating foundation on the premise that the floating foundation is limited in draught.

In this embodiment the rigid members 3 are truss structures, hollow inside, and may provide some buoyancy, which together with the ballast tanks 4 and other separate floating structures constitute the first buoyant body.

Of course, in other embodiments, the first floating body may also be acted upon by the ballast tank 4 alone, or by another separate floating structure without the ballast tank 4.

Preferably, the ballast tank 4 is of a flat construction, and several compartments for loading with filling material are provided in the ballast tank 4.

In this scheme, adopt above-mentioned structural style, make ballast tank 4 flat structure, can make ballast tank 4 act as and hang down the board, reduce the floating formula basis and hang down and swing in the stormy waves, strengthen its stability. The cabin for loading the filler is arranged in the ballast tank 4, the overall gravity center height of the floating foundation can be adjusted by increasing or decreasing the weight of the filler, and the floating foundation is guaranteed to have good stability.

As shown in fig. 1 and 2, the floating foundation further includes mooring lines 9, one end of each mooring line 9 is fixed to the sea floor, and the other end is connected to the tower fixing frame 2 or the first floating body. The floating foundation is secured to a specific area by mooring lines 9.

The tower tube fixing frame 2 in the embodiment comprises a first supporting beam, a second supporting beam and a connecting beam, wherein the first supporting beam and the second supporting beam are fixed in a cross structure, and the end part of the first supporting beam and the end part of the second supporting beam are fixedly connected end to end through the connecting beam. By adopting the structure, the whole structure of the tower tube fixing frame 2 is simple, the steel consumption is reduced, and the whole weight and the cost of the floating foundation are reduced.

Of course, in other embodiments, the tower holder 2 may also be a plate structure, or the first floating body may be provided with a mounting portion, so as to directly fix the tower 1 to the mounting portion of the first floating body.

In this embodiment, the second floating body 5 is arranged along the circumferential direction of the tower holder 2, and the outer periphery of the tower holder 2 is connected with the second floating body 5, so that a hollow region is formed in the middle of the second floating body 5 when the large floating block and the small floating block are connected, the length of the connecting beam of the tower holder 2 corresponds to the side length of the hollow region, and the connecting beam is connected with the inner sides of the large floating block and the small floating block through a hinge or a buckle.

As shown in FIGS. 1 and 2, the tower mount 2 further includes a plurality of reinforcing members 8, the plurality of reinforcing members 8 are distributed along the circumference of the tower 1, one side of the plurality of reinforcing members 8 is fixed to the first support beam or the second support beam, and the other side of the plurality of reinforcing members 8 is fixed to the outer side wall of the tower 1. The reinforcing part 8 can be used for stabilizing the tower drum 1 and enhancing the rigidity and the connection strength of the connection part of the tower drum 1 and the tower drum fixing frame 2.

Specifically, in the present embodiment, the first support beam and the second support beam of the tower holder 2 are about 20m long, the side length of the ballast tank 4 is about 14.2m and 14.2m, and the height is about 5-10 m, and the height of the truss structure between the ballast tank 4 and the tower holder 2 may be about 5 m-20 m depending on the water depth. The side length of the large floating block can be 30-80 m, and the side length of the small floating block can be 5-8 m. The floating foundation is provided with 4 root mooring ropes. The integral draught of the floating foundation is about 10 m-30 m, and the integral steel consumption is about 1000 t-2000 t.

The floating foundation has low gravity center, large water line surface and reliable anti-overturning stability. The damping support rod 6 between the large floating block and the tower barrel 1 can adjust the damping intensity according to the specific sea condition environment condition, and the heave plate type action of the ballast tank 4 is added, so that the floating foundation has good heave stability.

The second body 5 of this embodiment main combination formula floating block, the damping bracing piece 6 that has the flexible function of damping and the ballast tank 4 of the board-like of dangling make this showy formula basis have the dual antidumping nature advantage of low focus and big waterline face simultaneously on the stationarity of floating state. The heaving plate type ballast tank 4 and the second floating body 5 combined with the damping support rod 6 can also improve the heaving of the floating foundation under the condition of strong wind and waves, so that the floating foundation has good stability and hydrodynamic performance.

The floating type foundation has small draft, small steel consumption, excellent stability and obvious technical and economic advantages, and has a positive promoting effect on the wide floating type wind driven generator under the environmental condition of the transitional water depth sea area in China. In addition, the second floating body 5 is wide in material selection range, various novel composite materials can be used, seawater corrosion resistance of the second floating body is better than that of steel, and the advantages of the second floating body in manufacturing and installation are obvious due to the fact that standardized modular production is added.

The floating foundation scheme can be assembled and launched at a wharf, and then is wet-towed to a wind field by a towing wheel for anchoring and positioning, so that the construction and the installation are convenient. The large-area second floating body 5 provides anti-overturning capacity and stability for the floating foundation and facilitates routine maintenance of the fan. Mooring facilities such as mooring bollards and the like can be arranged on the edges of the second floating bodies 5, and operation and maintenance personnel can land on the second floating bodies 5 by using boats and then enter the tower barrel 1 along a walkway on the supporting beam of the cross structure below the tower.

Still can set up fishery aquaculture net case in the middle of the truss structure under tower section of thick bamboo mount 2, make full use of ocean resources has increased this showy basic function, has improved showy basic economic income, is favorable to the popularization of showy formula fan.

The embodiment also discloses offshore wind power generation equipment, which comprises a wind driven generator and the floating foundation, wherein the wind driven generator is arranged on the tower barrel 1.

While specific embodiments of the invention have been described above, it will be appreciated 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 scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. A floating foundation comprises a tower, a tower fixing frame and a first floating body, wherein the tower is arranged on the tower fixing frame, the tower fixing frame is fixedly arranged above the first floating body, the floating foundation is characterized by further comprising a second floating body, the second floating body is arranged along the circumferential direction of the tower fixing frame, and the outer periphery of the tower fixing frame is connected with the second floating body;

2. A floating foundation as claimed in claim 1 wherein said damping support is telescopic in length, said damping mechanism of said damping support providing damping as said damping support is telescopic.

3. A floating foundation as claimed in claim 1 wherein the ends of the damping support are hinged to the tower and/or the second buoyant body.

4. A floating foundation as claimed in claim 1 further including a sleeve received over said tower, said sleeve having a plurality of circumferentially extending attachment portions for attachment to a damping support.

5. A floating foundation as claimed in claim 1 wherein said second buoyant body is a flat structure.

6. A floating foundation as claimed in claim 5 wherein the body of the second float is made of an aluminium alloy or a non-metallic material.

7. A floating foundation as claimed in claim 1 further comprising a ballast tank connected to the tower mount or the first buoyant body by rigid members.

8. A floating foundation as claimed in claim 7 wherein said ballast tank is of a flat configuration and wherein a plurality of compartments are provided for holding filler.

9. A floating foundation according to claim 1 wherein said second buoyant body is assembled from a plurality of buoyant elements.

10. A floating foundation as claimed in claim 9 wherein said buoyant member includes a first buoyant block and a second buoyant block, said first buoyant block having a greater side length than said second buoyant block, said first buoyant block connected by said second buoyant block.

11. A floating foundation as claimed in claim 9 wherein each two adjacent said floating members are secured together by a plurality of connecting assemblies.

12. A floating foundation according to claim 11 wherein said connecting assembly includes first and second connectors fixedly secured to two floating members, respectively, said first and second connectors being connected by a third connector.

13. A floating foundation according to claim 1 further comprising mooring lines having one end secured to the sea floor and the other end attached to either the tower mount or the first buoy.

14. A floating foundation according to claim 1 wherein the tower mount comprises a first support beam, a second support beam and a connecting beam, the first support beam and the second support beam are fixed in a cross configuration, and the ends of the first support beam and the second support beam are fixedly connected end to end by the connecting beam.

15. A floating foundation as claimed in claim 14 wherein said tower mount further comprises a plurality of reinforcing members distributed circumferentially about said tower, one side of said plurality of reinforcing members being secured to said first or second support beam and the other side of said plurality of reinforcing members being secured to an outer side wall of said tower.

16. Offshore wind power plant, characterized in that it comprises a wind turbine and a floating foundation according to any of claims 1-15, the wind turbine being mounted on the tower.