Steel-concrete combined offshore floating platform with Y-shaped four-stand-column structure

Abstract

The invention relates to a steel-concrete combined Y-shaped four-stand-column structure offshore floating platform, and relates to the field of offshore wind turbine generators, the steel-concrete combined Y-shaped four-stand-column structure offshore floating platform comprises a center connection lower floating body, a plurality of floating body sections and a plurality of side connection floating bodies, one end of each floating body section is connected with the same center connection lower floating body, and the other end of each floating body section is connected with one side connection floating body; cavities are formed in the middles of the center connection lower floating body, the floating body sections and the edge connection floating bodies, the cavities are used for storing seawater, each edge connection floating body is provided with a side floating barrel, the center connection lower floating body is provided with a center stand column, and the floating body sections are arranged at equal intervals in the circumferential direction of the center stand column. Each side buoy is mounted on one side connecting floating body, the side buoys and the central stand column are arranged on the same side, and the central connecting lower floating body, the floating body sections, the side connecting floating bodies, the side buoys and a middle cavity of the central stand column are communicated with one another. The center stand column has the effect of improving the structural strength of the center stand column.

Description

Technical Field

[0001] This application relates to the field of offshore wind turbines, and in particular to a steel-concrete composite Y-shaped four-column structure offshore floating platform. Background Technology

[0002] At sea, as the distance from the shore increases, the water depth also gradually increases. When the water depth exceeds 50-60 meters, the cost and construction difficulty of fixed wind turbine foundations, which are currently widely used in nearshore wind farms and are anchored to the seabed, increase significantly, rendering them no longer advantageous. Therefore, floating wind turbine foundation platforms are bound to become an important research direction for future offshore wind power development.

[0003] Currently, there are various forms of offshore floating wind turbine foundations, many of which adopt semi-submersible floating structures. These typically have a bottom structure, a top structure, and several intermediate connecting structures. The design of such structures needs to be determined based on factors such as environmental conditions, the size and type of the wind turbine, manufacturing and installation, and economic efficiency.

[0004] The aforementioned technical solutions have the following drawbacks: the wind turbine is installed on the offshore floating platform through the central column, which bears a large stress and is prone to damage, which in turn leads to the overall instability and overturning of the platform. Summary of the Invention

[0005] To enhance the structural strength of the central column, this application provides a steel-concrete composite Y-shaped four-column structure offshore floating platform.

[0006] This application provides a steel-concrete composite Y-shaped four-column structure offshore floating platform with the following technical solution: A steel-concrete composite Y-shaped four-column offshore floating platform includes a central connecting lower float, multiple float segments, and multiple side connecting floats. Each float segment is connected at one end to the same central connecting lower float and at the other end to a side connecting float. The central connecting lower float, float segments, and side connecting floats all have cavities in the middle for storing seawater. Each side connecting float is equipped with a side buoy, and the central connecting lower float is equipped with a central column. The multiple float segments are arranged at equal intervals along the circumference of the central column. Each side buoy is installed on a side connecting float and is located on the same side as the central column. The cavities in the middle of the central connecting lower float, float segments, side connecting floats, side buoys, and central column are interconnected.

[0007] By adopting the above technical solution, a central column is set on the lower floating body of the central connection, and side buoys are set on the side floating bodies. The side buoys and the central column are connected by the floating body segments. When the floating platform contains seawater, the seawater flows within the floating platform. When there are waves on the sea surface where the floating platform is located, the seawater within the floating platform can flow when the floating platform sways. The seawater within the floating platform provides viscous damping, thereby reducing the swaying amplitude of the floating platform.

[0008] Optionally, an upper connecting rod is provided on the side buoy, with one end of the upper connecting rod connected to the side buoy and the other end connected to the central column.

[0009] By adopting the above technical solution, and by setting an upper connecting rod between the side buoys and the central column, the upper connecting rod supports the central column and the side buoys, thereby improving the structural strength of the central column.

[0010] Optionally, the upper connecting rod is configured as a hollow box structure.

[0011] By adopting the above technical solution, and by setting the upper connecting rod as a box structure, the weight of the upper connecting rod is reduced, thereby reducing the overall weight and steel consumption of the offshore floating platform.

[0012] Optionally, a cavity is provided in the middle of the float segment, and two baffles are provided in the cavity. The length direction of the baffles is parallel to the length direction of the float segment. The baffles divide the float segment into three cavities. A pipe section sealing plate is provided at the end face of the float segment to seal the end face of the float segment. A through hole is provided on the pipe section sealing plate located between the two baffles.

[0013] By adopting the above technical solution, by setting a baffle in the middle of the floating body segment, the two baffles divide the floating body segment into three cavities. The two cavities on both sides are used to allow seawater to circulate. When seawater flows through the floating body segment between the central column and the side buoys, the probability of disordered water flow and fluctuations in the floating body segment can be reduced, thereby reducing the probability of seawater vibration in the offshore floating platform being transmitted to the offshore floating platform.

[0014] Optionally, the floating body segment is provided with solid ballast material, which is disposed between two partitions.

[0015] By adopting the above technical solution, solid ballast is set in the middle of the floating body segment, thereby stabilizing the center of gravity of the floating body segment. The solid ballast can be cast integrally and fill the internal cavity of the floating body segment, thereby improving the structural strength of the floating body segment.

[0016] Optionally, the floating body segment is provided with multiple corrugated pipes, which are embedded in the floating body segment and form through holes on the end face of the floating body segment. The through holes are arranged at equal intervals along the outer extension of the floating body segment. Multiple through holes are opened on the side of the partition plate. Multiple steel strands are provided in the corrugated pipes, and the ends of the steel strands extend out of the floating body segment and are fixed by anchor plates.

[0017] By adopting the above technical solution, multiple corrugated pipes are installed within the floating body segment, and steel strands are installed inside the corrugated pipes. The ends of the steel strands are connected to anchor plates, which are clamped onto the end face of the floating body segment. The anchor plates ensure that the stress on the steel strands is evenly distributed on the end face of the floating body segment. The steel strands can bear the tensile stress on the concrete, thereby reducing the probability of cracking due to insufficient tensile strength of the concrete. Through holes are opened on the side wall of the partition and steel strands are inserted to further improve the connection firmness of the floating body segment.

[0018] Optionally, the side float has a frustum-shaped structure, and the end face of the side with the smaller area is connected to the side connecting float.

[0019] By adopting the above technical solution, and by setting the side float to a frustum shape, the upper cross-section of the side float is larger, while the lower side is connected to the side connecting float and has a smaller cross-section, thereby increasing the volume of the side float.

[0020] Optionally, the side buoys are inclined, and the axis of the side buoys is set at an angle to the length direction of the central column.

[0021] By adopting the above technical solution and tilting the side buoys outward, the waterline moment of inertia of the offshore floating platform is increased, thereby enhancing its ability to resist the capsizing moment of wind and waves. This reduces the pitch and roll amplitudes. The outward tilting structure causes a greater shift in the center of buoyancy when tilted, generating a stronger restoring moment and making the offshore floating platform more stable on the sea surface.

[0022] Optionally, a cavity one is formed in the lower central connecting body, and a cavity two is formed in the side connecting body. Cavities one and two are annular structures.

[0023] By adopting the above technical solution, and by setting the cavities inside the central connecting lower float and the side connecting float as annular chambers, when the offshore floating platform tilts, seawater flows inside the offshore floating platform. The impact force of the seawater flow on the inner walls of cavity one and cavity two is smaller, thus extending the service life of the central connecting lower float and the side connecting float.

[0024] In summary, the beneficial technical effects of this application are as follows: 1. By setting a central column on the lower floating body of the central connection and side buoys on the side connecting floating bodies, the flow between the side buoys and the central column is achieved through the floating body segments. When seawater is stored in the floating platform, the seawater flows within the floating platform. When there are waves on the sea surface where the floating platform is located, the seawater within the floating platform can flow when the floating platform sways. The seawater within the floating platform provides viscous damping, thereby reducing the swaying amplitude of the floating platform. 2. By setting a baffle in the middle of the floating body segment, the two baffles divide the floating body segment into three cavities. The two cavities on both sides are used to allow seawater to circulate. When seawater flows through the floating body segment between the central column and the side buoys, it can reduce the probability of disordered water flow and fluctuations in the floating body segment, thereby reducing the probability of seawater vibration in the offshore floating platform being transmitted to the offshore floating platform. 3. By setting the cavities inside the central connecting lower float and the side connecting float as annular chambers, when the offshore floating platform tilts, seawater flows inside the offshore floating platform. The impact force of the seawater flow on the inner walls of cavity one and cavity two is smaller, thus extending the service life of the central connecting lower float and the side connecting float. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0026] Figure 2 This is a schematic diagram of the structure of the floating body segment in Embodiment 1 of this application.

[0027] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0028] Figure 4 This is a schematic diagram of the structure of the central connecting lower float in Embodiment 1 of this application.

[0029] Figure 5 This is a cross-sectional view of the structure of the central connecting lower floating body in Embodiment 1 of this application.

[0030] Figure 6 This is a schematic diagram of the structure of the side-connected float in Embodiment 1 of this application.

[0031] Figure 7 This is a structural cross-sectional view of the side-connected floating body in Embodiment 1 of this application.

[0032] Figure 8 This is a schematic diagram of the inclined arrangement of the side buoy in Embodiment 1 of this application.

[0033] Figure 9 This is a schematic diagram of the overall structure of Embodiment 2 of this application. Figure 1 .

[0034] Figure 10 This is a schematic diagram of the overall structure of Embodiment 2 of this application. Figure 2 .

[0035] Reference numerals in the attached drawings: 1. Lower float connecting the center; 11. Cavity 1; 2. Float segment; 21. Baffle; 22. Corrugated pipe; 23. Steel strand; 3. Side float connecting the side; 31. Cavity 2; 4. Side float; 5. Center column; 6. Upper connecting rod; 7. Horizontal support rod; 8. Inclined support rod; 9. Reinforcing member. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the accompanying drawings.

[0037] Example 1 This application discloses a steel-concrete composite Y-shaped four-column structure offshore floating platform, referring to... Figure 1 It includes a central connecting lower float 1, multiple float segments 2, multiple side connecting floats 3, multiple side floats 4, and a central column 5. The central column 5 is installed on the central connecting lower float 1. There are three float segments 2, and all three float segments 2 are connected to the central connecting lower float 1. The length direction of the float segments 2 points to the center of the central column 5. The end of the float segment 2 away from the central connecting lower float 1 is connected to the side connecting float 3. Each side connecting float 3 is equipped with a side float 4. The central connecting lower float 1, multiple float segments 2, multiple side connecting floats 3, multiple side buoys 4, and a central column 5 are all hollow box-type structures. The floating platform is equipped with inlet and outlet pumps. The inlet pumps draw seawater into the platform, allowing it to flow freely within these components, ensuring the water level is flush with the surrounding water, thus enabling the platform to float. While floating, the inlet and outlet pumps control the amount of seawater within the platform, thereby controlling its submersion depth.

[0038] Reference Figure 1 The central connecting lower floating body 1 and the side connecting floating bodies 3 are steel components or reinforced concrete structures, the central column 5 is a steel component, the floating body segment 2 is a precast UHPPC component, and the side buoys 4 are all concrete structures or reinforced concrete structures. Ballast tanks are provided in the central connecting lower floating body 1, multiple floating body segments 2, multiple side connecting floating bodies 3, and a central column 5. These ballast tanks are either ballast water tanks or solid ballast tanks. Solid ballast tanks contain solid ballast material, which can be concrete. Ballast water tanks are used to store seawater to balance the tilting attitude of the offshore floating platform.

[0039] Reference Figure 1 The floating body segment 2 is prefabricated in sections, and multiple prefabricated structural components are spliced ​​together to form the floating body segment 2. The side pontoons 4 are prefabricated in sections, and the prefabricated structural components are circular ring structures. Multiple circular ring structural components are stacked and connected to form the side pontoons 4.

[0040] Reference Figure 2 and Figure 3 The floating section 2 has two parallel baffles 21 inside, integrally formed and fixed within it. The baffles 21 enhance the overall structural strength of the floating section 2, dividing its internal cavity into three chambers. The central chamber can be used to house solid ballast, while the two side chambers serve as seawater flow channels. The baffles 21 are positioned identically within the floating section 2; when multiple floating sections 2 are connected, the three chambers correspond in position and are interconnected. In other embodiments, a pipe section sealing plate is provided at the end face of the floating section 2, sealing the end face. A through hole is formed on the pipe section sealing plate located between the two baffles 21. The central chamber between the two baffles 21 allows seawater flow, while the two side chambers are sealed chambers where solid ballast can be placed, reducing the likelihood of deterioration or corrosion under seawater immersion.

[0041] When the floating platform contains seawater and is swaying on the sea surface, the chambers on both sides of the floating body segment 2 for seawater flow are connected to the side connecting floating body 3 and the central connecting lower floating body 1. Therefore, the seawater in the chambers of the floating body segment 2 flows to the central connecting lower floating body 1 or the side connecting floating body 3, and then flows to other positions of the floating platform.

[0042] Reference Figure 4 and Figure 5 The central connecting lower float 1 is a circular plate structure with an annular cavity 11 inside. Multiple float segments 2 are equidistantly spaced along the circumference of the central connecting lower float 1, and the internal channels of the float segments 2 communicate with the cavity 11. In this embodiment, there are 3 float segments 2, and adjacent float segments 2 form a 120° angle.

[0043] Reference Figure 3Multiple corrugated pipes 22 are embedded in the floating section 2, with their length parallel to that of the floating section 2. The corrugated pipes 22 are pre-embedded in the concrete of the floating section 2, forming channels within them. The corrugated pipes 22 are embedded in the floating section 2, creating through holes on its end face. Multiple through holes are formed on the end face of the floating section 2, spaced equidistantly along its outer edge. Multiple through holes are also formed on the end face of the partition plate 21. Each through hole on the end face of the floating section 2 contains a corrugated pipe 22, and each corrugated pipe 22 contains multiple steel strands 23. The ends of the steel strands 23 extend outside the floating section 2 and are connected to anchor plates. The anchor plates convert the concentrated stress generated during the tensioning of the steel strands into a uniformly distributed load, preventing the concrete from crushing or cracking due to excessive local compressive stress.

[0044] Reference Figure 6 and Figure 7 The side-connecting float 3 has a cavity 31, which is an annular channel. The two openings of the annular channel connect to two seawater channels within the float segment 2. The chamber within the side float 4 communicates with cavity 31. The side float 4 has a frustum-shaped structure, with the side with the smaller cross-sectional area connected to the side-connecting float 3. When the floating platform is submerged, the side float 4 stands upright and is positioned above the side-connecting float 3. By designing the side float 4 as a frustum-shaped structure, its volume is increased, allowing it to store more seawater.

[0045] Reference Figure 1 The central column 5 is a hollow tubular structure, perpendicular to the centrally connected lower floating body 1, and the internal cavity of the central column 5 is connected to cavity 11. The interior of the central column 5 can store seawater, further lowering the center of gravity of the offshore floating platform and reducing its sway when floating on a windy and wavery sea surface.

[0046] Reference Figure 1 An upper connecting rod 6 is installed between the central column 5 and the side buoys 4. The upper connecting rod 6 has a box-shaped structure, thereby reducing the weight of the offshore floating platform. One end of the upper connecting rod 6 is fixed to the central column 5, and the other end is fixed to the side buoy 4. The upper connecting rod 6 provides support to the upper side of the side buoy 4, which can improve the structural strength of the side buoy 4.

[0047] Reference Figure 8 In other embodiments, the side buoys 4 are inclined. The axis of the side buoys 4 is inclined relative to the central column 5. Multiple side buoys 4 form the same angle with the central column 5. The side buoys 4 can be configured in an outward inclined state, thereby increasing the waterline moment of inertia of the offshore floating platform, improving its ability to resist capsizing moments from wind and waves, reducing pitch and roll amplitudes, and the outward inclined structure causes a greater shift in the center of buoyancy when tilted, generating a stronger restoring moment.

[0048] The implementation principle of this application embodiment is as follows: by connecting three floating body segments 2 to the outside of the central connecting lower floating body 1, connecting a side connecting floating body 3 to the end of each floating body segment 2, and setting a side buoy 4 on the side connecting floating body 3, the offshore floating platform can store seawater. By pumping seawater into the offshore floating platform or discharging seawater, the floating height of the offshore floating platform on the sea surface can be controlled.

[0049] Example 2 This application discloses a steel-concrete composite Y-shaped four-column structure offshore floating platform, referring to... Figure 9 and Figure 10 The difference from Embodiment 1 is that a horizontal support rod 7 is provided between two adjacent upper connecting rods 6, and the three horizontal support rods 7 are arranged to form an equilateral triangle structure. The horizontal support rod 7 supports the two adjacent upper connecting rods 6, thereby strengthening the structural strength of the upper connecting rods 6.

[0050] Reference Figure 9 Each side buoy 4 is equipped with an inclined support rod 8. One end of the inclined support rod 8 is fixed to the bottom of the side buoy 4, and the other end is fixed to the upper end of the central column 5. The inclined support rod 8 is inclined and supports the central column 5, which can improve the structural strength of the central column 5 and enhance the load-bearing capacity of the central column 5.

[0051] Reference Figure 9 Each horizontal support rod 7 is equipped with a reinforcing member 9, which is a plate structure. The length direction of the reinforcing member 9 is parallel to that of the horizontal support rod 6. One end of the reinforcing member 9 is fixed to the middle of the horizontal support rod 7, and the other end is fixed to the central column 5. The reinforcing member 9 is used to support between the central column 5 and the horizontal support rod 7, thereby improving the structural strength of the horizontal support rod 7.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A steel-concrete composite Y-shaped four-column offshore floating platform, characterized in that: It includes a central connecting lower float (1), multiple float segments (2) and multiple side connecting floats (3). One end of each float segment (2) is connected to the same central connecting lower float (1), and the other end is connected to a side connecting float (3). The central connecting lower float (1), float segments (2) and side connecting floats (3) are all provided with cavities in the middle, which are used to store seawater. Each side connecting float (3) is provided with a side float (4). The central connecting lower float (1) is provided with a central column (5). Multiple float segments (2) are arranged at equal intervals along the circumference of the central column (5). The side floats (4) are provided on the same side as the central column (5). The cavities in the middle of the central connecting lower float (1) and the central column (5) are connected. The cavities in the middle of the side connecting floats (3) and the side floats (4) are connected to each other.

2. The steel-concrete composite Y-shaped four-column offshore floating platform according to claim 1, characterized in that: The side buoy (4) is provided with an upper connecting rod (6), one end of which is connected to the side buoy (4) and the other end is connected to the central column (5).

3. The steel-concrete composite Y-shaped four-column structure offshore floating platform according to claim 2, characterized in that: The upper connecting rod (6) is configured as a hollow box structure.

4. The steel-concrete composite Y-shaped four-column offshore floating platform according to claim 1, characterized in that: The floating body segment (2) has a cavity in the middle, and two partitions (21) are provided in the cavity. The length direction of the partitions (21) is parallel to the length direction of the floating body segment (2). The partitions (21) divide the floating body segment (2) into three cavities. A pipe section sealing plate is provided at the end face of the floating body segment (2). The pipe section sealing plate seals the end face of the floating body segment (2). A through hole is provided on the pipe section sealing plate located between the two partitions (21).

5. A steel-concrete composite Y-shaped four-column offshore floating platform according to claim 4, characterized in that: Solid ballast is provided inside the floating section (2), and the solid ballast is located between two partitions (21).

6. A steel-concrete composite Y-shaped four-column offshore floating platform according to claim 5, characterized in that: Multiple corrugated pipes (22) are installed inside the floating body section (2). The corrugated pipes (22) are embedded in the floating body section (2) and form through holes on the end face of the floating body section (2). The through holes are arranged at equal intervals along the outer extension of the floating body section (2). Multiple through holes are opened on the side of the partition plate (21). Multiple steel strands (23) are installed inside the corrugated pipes (22). The ends of the steel strands (23) extend out of the floating body section (2) and are fixed by the anchor plate.

7. The steel-concrete composite Y-shaped four-column structure offshore floating platform according to claim 1, characterized in that: The side float (4) has a frustum-shaped structure, and the end face of the side with the smaller area is connected to the side connecting float (3).

8. A steel-concrete composite Y-shaped four-column offshore floating platform according to claim 7, characterized in that: The side buoy (4) is set at an angle, and the axis of the side buoy (4) is set at an angle to the length direction of the central column.

9. A steel-concrete composite Y-shaped four-column offshore floating platform according to claim 1, characterized in that: The central connecting lower float (1) has a cavity one (11) and the side connecting float (3) has a cavity two (31). Cavity one (11) and cavity two (31) are annular structures.

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