CN114892703A - Double-cone grid plate type offshore wind power floating foundation structure - Google Patents

Abstract

The invention discloses a double-cone grid plate type offshore wind power floating basic structure, comprising a connecting seat and a double-cone-grid plate-type column, the double-cone-grid plate-type column is fixedly connected with the connecting seat, and the double-cone-grid plate-type column includes a column cylinder part and a cone frustum. The truncated cone part is sleeved on both ends of the cylindrical part. It can increase the water plane under wind and wave conditions, provide a sufficiently large restoring moment for the system, and effectively improve the motion stability of the floating structure in the harsh environment of deep sea.

Description

A double-cone grid plate floating foundation structure for offshore wind power

technical field

The invention belongs to the technical field of offshore wind power development equipment, and in particular relates to a double cone grid plate type offshore wind power floating basic structure.

Background technique

my country is at a critical stage of energy transformation. As a renewable and clean energy, wind energy plays a pivotal role in the development of new energy in my country, with increasingly mature technologies and declining costs. Compared with onshore wind power, offshore wind power has unique advantages. Offshore wind resources are abundant and wind speed and direction are stable; offshore wind farms do not occupy land resources; single-machine capacity is large and suitable for large-scale development. At present, the development of offshore stationary wind power has basically achieved industrialization, and some early-established offshore wind farms are entering the middle and later stages of development. However, for the development of floating wind power with a water depth of more than 50 meters, both domestic and international are still in the experimental research stage. In the long run, as the development of wind power resources in the intertidal zone and offshore areas becomes increasingly saturated, the development of offshore wind power from the offshore to the deep sea is an inevitable trend, and it is imperative to develop and design the structure of floating offshore wind turbines.

The floating offshore wind turbine structure is a complex engineering equipment with multi-system combination, which is composed of multiple subsystems, mainly including the upper fan, the middle tower, the lower floating foundation and the mooring system. The offshore wind turbine system is a high-rise structure, and the horizontal load and vertical load are of the same order of magnitude. The horizontal overturning moment may cause the floating foundation to sway greatly, or even overturn.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a double-cone grid plate type offshore wind power floating foundation structure, which can increase the water plane under wind and wave conditions, and provide a sufficiently large restoring moment for the system. It can effectively improve the motion stability of the floating structure in the harsh environment of deep sea.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A double-cone grid plate type offshore wind power floating foundation structure, which is characterized in that it comprises a connecting seat and a double-cone-grid plate-type column, the double-cone-grid plate-type column is fixedly connected with the connecting seat, and the double-cone-grid plate-type column includes a column cylinder part and a cone frustum. The truncated cone part is sleeved on both ends of the cylindrical part. The double-cone grid plate column can increase the water plane under wind and wave conditions, provide a sufficiently large restoring moment for the system, and effectively improve the motion stability of the floating structure in the harsh environment of deep sea.

Further, the two truncated cone portions are disposed opposite to each other. The top surfaces of the truncated cones are set opposite to each other, so that the lower truncated cones are set in the forward direction, and the upper truncated cones are set in the reverse direction as inverted cones. In the middle position, in particular, the length of the middle cylindrical section is shorter. The design waterline of the operating condition is set in the middle section, which will have a smaller waterplane surface than the lower and upper sections of the outward expansion, thereby ensuring that the structure is subject to less wave and flow force under normal working conditions. At the same time, the frustum of the upper inverted cone can effectively prevent waves from climbing, ensuring that the flared design will not have additional risks of rising waves and slamming.

Further, the side wall of the frustum portion is provided with grid holes, and the aperture of the grid holes gradually increases from the inside to the outside. The truncated cone is provided with grid holes that shrink in one direction, so that the water flow is easy to enter and difficult to exit, disturbing the flow field to achieve the purpose of energy dissipation, and can also smooth the wave pulsation and attack force and reduce the vibration of the floating body structure.

Further, the cylindrical portion is provided with multi-layered wing plates, the wing plates are arranged in the frustum portion, and each layer of the wing plates is arranged at intervals. The spaced-around column wings will generate additional flow resistance due to the inflow of water, thereby providing additional damping for restraining the large-scale movement of the structure, which can effectively improve the stability of the floating body structure.

Further, the width of the wing plate gradually increases from the center to both ends of the cylindrical portion. The general width gradually increases, so that the wing plate can fit the inner wall of the frustum body, and further improve the stability of the floating body structure.

Further, the number of double-cone grid plate-type uprights is at least three and evenly distributed on the outer side of the connection seat. The evenly arranged double-cone grid plate-type columns can effectively improve the overall stability and avoid the overturning of the floating body structure.

Further, the cylindrical portion is provided with an accommodating cavity. Through the arrangement of the accommodating cavity, ballast materials, such as seawater, high-density ore, concrete, etc., can be filled in the cylindrical portion, which facilitates adjustment of the draft state and underwater posture of the floating body structure. The size adjustment and detailed internal compartment division can be carried out according to the actual design requirements.

Further, the double-cone grid plate-type column is provided with a mooring mechanism, the mooring mechanism includes a windlass and a mooring line, the windlass is connected with the mooring line, and the windlass is arranged in the column barrel. Through the windlass and mooring lines, the floating body structure can be moored to improve the overall stability of the floating body structure and avoid being blown away by the wind.

Further, the truncated cone portion at the upper end is provided with a cable. The cable is used to connect the fan tower set on the connection base, effectively disperse the horizontal load conducted by the fan tower, greatly reduce the stress condition of the bottom node, and simplify the structure size of the interface between the fan tower and the floating structure. By adjusting the position of the cable point, the natural vibration frequency of the overall structure can be adjusted to prevent resonance damage.

The present invention has the following beneficial effects due to the adoption of the above-mentioned technical solutions:

1) The double cone grid plate column design of the present invention increases the water plane of the floating body structure under wind and wave conditions when heave, roll and pitch occur, and can provide a greater restoring moment for the system during movement, which can effectively To improve the movement stability of the floating structure in the harsh environment of deep sea;

2) The truncated cone of the present invention is provided with one-way shrinking grid holes, so that the water flow is easy to enter and difficult to exit, disturbing the flow field, achieving the purpose of energy dissipation, and also smoothing the wave pulsation and attacking force and reducing the vibration of the floating body structure.

3) The column-winding wing plate provided on the inner side of the truncated cone of the present invention will cause additional flow resistance to the inflow of water, thereby providing additional damping for restraining the large-scale movement of the structure, which can effectively improve the stability of the foundation.

4) The truncated cones set opposite to each other can effectively prevent waves from climbing, and ensure that the outward expansion design will not have additional risks of rising waves and slamming.

5) The fan tower is connected to the center of the connecting seat and is located in the center of the structure, and the tower does not need to be additionally provided with a transition section and a column buoy.

6) The present invention connects the fan tower with the double-cone grid plate column through the cable, which can effectively disperse and transmit the horizontal load conducted by the upper tower, greatly reduce the stress condition of the bottom connecting node, and simplify the interface between the fan tower and the foundation. the structure size. By adjusting the position of the cable point, the natural vibration frequency of the overall structure can be adjusted to prevent resonance damage.

7) The basic structure of the present invention is a semi-submersible type, which has a wide range of water depth applications and can be applied to both shallow water and deep water seas.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings:

Fig. 1 is the structural representation of a kind of double cone grid plate type offshore wind power floating foundation structure of the present invention;

Fig. 2 is the structural representation of the double-cone grid plate type column in the present invention;

Fig. 3 is the structural representation of the cylindrical portion in the present invention;

FIG. 4 is a schematic structural diagram of the frustum portion in the present invention.

In the figure, 1-connecting seat; 2-double-cone grid plate column; 3-column cylinder; 4-truncated cone; 5-grid hole; 6-wing plate; 7-sealing plate; 8-windlass; 9 - mooring line; 11 - stay cable; 12 - wind turbine tower.

Detailed ways

As shown in FIGS. 1 to 4 , it is a double-cone grid plate type offshore wind power floating foundation structure of the present invention, comprising a connecting seat 1 and a double-cone grid plate-type column 2, and the double-cone grid plate column 2 is fixedly connected with the connecting seat 1, The double-cone grid plate type column 2 includes a cylindrical portion 3 and a frustum portion 4 , and the frustum portion 4 is sleeved on both ends of the cylindrical portion 3 . The double-cone grid plate column 2 can increase the water plane under wind and wave conditions, provide a sufficiently large restoring moment for the system, and effectively improve the motion stability of the floating structure in the harsh environment of deep sea.

The two frustum portions 4 are arranged opposite to each other. The top surfaces of the truncated cones 4 are set opposite to each other, so that the lower truncated cones are set in the forward direction, and the upper truncated cones are set in the reverse direction as inverted cones. Through the design of this structure, the operating condition design waterline is located in the middle section of the hourglass-shaped column. In the middle position, in particular, the length of the middle cylindrical section is shorter. The design waterline in the operating condition is set in the middle section, which will have a smaller waterplane surface than the lower and upper sections of the outward expansion, thereby ensuring that the structure is subject to less wave and flow force under normal working conditions. At the same time, the frustum of the upper inverted cone can effectively prevent waves from climbing, ensuring that the flared design will not have additional risks of rising waves and slamming. The bottom surface of the truncated cone portion 4 has a closed structure, and can function as a heave plate without providing through holes or the like.

The side walls of the frustum portion 4 are provided with grid holes 5 , and the apertures of the grid holes 5 gradually increase from the inside to the outside. The frustum portion 4 is provided with grid holes 5 that contract in one direction, so that the water flow is easy to enter and difficult to exit, disturbing the flow field, achieving the purpose of energy dissipation, and also smoothing the wave pulsation and attacking force, reducing the vibration of the floating body structure.

The cylindrical portion 3 is provided with a multi-layered wing plate 6, the wing plate 6 is arranged in the frustum portion 4, and each layer of the wing plate 6 is arranged at intervals. The spaced around-column wings 6 will generate additional flow resistance due to the inflow of water, thereby providing additional damping for restraining the large-scale movement of the structure, which can effectively improve the structural stability of the floating body.

The width of the wing plate 6 gradually increases from the center of the cylindrical portion 3 to both ends. The general width gradually increases, so that the wing plate 6 can fit the inner wall of the frustum body, and further improve the stability of the floating body structure.

The number of double-cone grid plate-type uprights 2 is at least three and evenly distributed on the outside of the connection base 1 . Through the evenly arranged double-cone grid plate-type columns 2, the overall stability can be effectively improved, and the overturning of the floating body structure can be avoided.

The cylindrical portion 3 is provided with an accommodating cavity. Through the arrangement of the accommodating cavity, ballast material, such as seawater, high-density ore, concrete, etc., can be filled in the cylindrical portion 3, which facilitates adjustment of the draft state and underwater posture of the floating body structure. The size adjustment and detailed internal compartment division can be carried out according to the actual design requirements. The upper and lower ends of the accommodating cavity are provided with sealing plates 7 to seal

The double-cone grid plate type column 2 is provided with a mooring mechanism. The mooring mechanism includes a windlass 8 and a mooring line 9 . The windlass 8 and the mooring lines 9 are connected. The windlass 8 is arranged in the column barrel 3 . Through the windlass 8 and the mooring lines 9, the floating body structure can be moored to improve the overall stability of the floating body structure and avoid being blown away by the wind.

The frustum portion 4 at the upper end is provided with a cable 11 . The cable 11 is used to connect the fan tower 12 arranged on the connection base 1, effectively disperse the horizontal load conducted by the fan tower 12, greatly reduce the stress condition of the bottom node, and simplify the interface between the fan tower 12 and the floating body structure the structure size. By adjusting the position of the 11 points of the cable, the natural vibration frequency of the whole structure can be adjusted to prevent resonance damage.

The present invention has the following beneficial effects due to the adoption of the above-mentioned technical solutions:

1) The design of the double-cone grid plate column 2 of the present invention increases the waterplane surface of the floating body structure under wind and wave conditions when heave, roll and pitch occur, and can provide a greater restoring moment for the system during motion, which can be Effectively improve the motion stability of the floating structure in the harsh environment of deep sea;

2) The truncated cone portion 4 of the present invention is provided with one-way shrinking grid holes 5, so that the water flow is easy to enter and difficult to exit, disturb the flow field, achieve the purpose of energy dissipation, and also smooth the wave pulsation and attack force and reduce the vibration of the floating body structure.

3) The column-winding wing plate 6 arranged inside the truncated cone portion 4 of the present invention will cause additional flow resistance to the inflow of water, thereby providing additional damping for restraining the large-scale movement of the structure, which can effectively improve the stability of the foundation.

4) The truncated cones 4 arranged opposite to each other can effectively prevent waves from climbing, and ensure that the outward expansion design will not have additional risks of rising waves and slamming.

5) The fan tower 13 is connected to the center of the connection base 1 and is located in the center of the structure, and the tower does not need to be additionally provided with a transition section and a column buoy.

6) The present invention connects the fan tower 13 and the double-cone grid plate type column 2 through the cable 11, which can effectively disperse and conduct the horizontal load conducted by the upper tower, greatly reduce the stress condition of the bottom connecting node, and simplify the fan tower 13 Structural dimensions at the interface with the foundation. By adjusting the position of the 11 points of the cable, the natural vibration frequency of the whole structure can be adjusted to prevent resonance damage.

7) The basic structure of the present invention is a semi-submersible type, which has a wide range of water depth applications and can be applied to both shallow water and deep water seas.

The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention in order to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a floating foundation structure of bipyramid grid tray formula offshore wind power which characterized in that: the connecting device comprises a connecting seat and a double-cone grid plate type stand column, wherein the double-cone grid plate type stand column is fixedly connected with the connecting seat, the double-cone grid plate type stand column comprises a column tube part and a frustum part, and the frustum part is sleeved at two ends of the column tube part.

2. The double-cone grid plate type offshore wind power floating foundation structure of claim 1, wherein: the two cone portions are arranged opposite to each other.

3. The double-cone grid plate type offshore wind power floating foundation structure of claim 1, wherein: the side wall of the frustum part is provided with a grating hole, and the aperture of the grating hole is gradually increased from inside to outside.

4. The double-cone grid plate type offshore wind power floating foundation structure of claim 1, wherein: the column barrel part is provided with a plurality of layers of wing plates, the wing plates are arranged in the frustum part, and each layer of wing plates are arranged at intervals.

5. The double-cone grid plate type offshore wind power floating foundation structure of claim 4, wherein: the width of the wing plates of different layers is gradually increased from the center of the cylindrical part to two ends.

6. The double-cone grid plate type offshore wind power floating foundation structure of claim 1, wherein: the number of the double-cone grid plate type upright posts is at least three, and the double-cone grid plate type upright posts are uniformly distributed on the outer side of the connecting seat.

7. The double-cone grid plate type offshore wind power floating foundation structure of claim 1, wherein: the column barrel part is provided with an accommodating cavity.

8. The double-cone grid plate type offshore wind power floating foundation structure of claim 1, wherein: the double-cone grid plate type stand column is provided with a mooring mechanism, the mooring mechanism comprises an anchor machine and a mooring cable, the anchor machine is connected with the mooring cable, and the anchor machine is arranged on the column barrel portion.

9. The double-cone grid plate type offshore wind power floating foundation structure of claim 1, wherein: the upper end of the frustum part is provided with a guy cable.

Images