Offshore wind turbine generator installation platform

Abstract

According to the offshore wind turbine generator installation platform, the structure of the offshore wind turbine generator installation platform is improved, the stability of a self-elevating installation platform is improved, and the supporting requirement of the self-elevating installation platform for deepwater operation is met. The offshore wind turbine generator installation platform comprises a platform body, a transverse supporting rod and a plurality of vertically-extending pile legs, the platform body is provided with a plurality of first channels, the first channels vertically penetrate through the platform body, the pile legs are arranged in the first channels, and the pile legs can vertically move up and down; each pile leg is provided with a first pile section and a second pile section which are vertically distributed, the first pile sections are located on the upper side of the platform body, the second pile sections are located on the lower side of the platform body and used for directly or indirectly abutting against the seabed, the transverse supporting rods extend in the horizontal direction, and the two ends of each transverse supporting rod are movably connected to the second pile sections of the pile legs on the corresponding sides respectively. And the second pile section can move up and down relative to the second pile section.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind turbine installation, and in particular to an offshore wind turbine installation platform. Background Art

[0002] As the global demand for renewable energy continues to grow, offshore wind power, as a clean and efficient form of energy, has developed rapidly in recent years. The construction of offshore wind farms not only helps to reduce greenhouse gas emissions, but also can alleviate dependence on traditional fossil energy to a certain extent. At present, the construction of offshore wind farms in my country is mainly concentrated in diving waters. The wind power installation technology within this water depth range is relatively mature, and the existing wind power installation ships on the market can effectively complete the piling of wind turbine foundations, the hoisting of wind turbine components, and subsequent commissioning. However, with the continuous advancement of offshore wind power technology and the increasing tension of exploitable marine resources, expansion into deeper waters has become an inevitable trend in the development of offshore wind power.

[0003] The self-elevating installation platform is responsible for the installation of offshore wind turbines, but the existing self-elevating wind turbine installation platform has poor adaptability to deep water, especially 100-meter deep water. This is because as the operating water depth increases, in order to meet the stability and support requirements of the platform, the overhang of the pile legs also needs to be increased accordingly. If the overhang height of the pile legs of the self-elevating installation platform is too high, it will cause the pile legs to be easily buckled and unstable in deep water environments. Summary of the invention

[0004] The purpose of the present invention is to provide an offshore wind turbine installation platform. By improving the structure of the offshore wind turbine installation platform, the adaptability of the self-elevating wind turbine installation platform to deep-water operations of 100 meters is improved, the anti-buckling capacity of large-height pile legs is improved, the stability of the self-elevating installation platform is improved, and the support requirements of the self-elevating installation platform in deep-water operations are met.

[0005] To achieve the above-mentioned purpose, the present invention provides an offshore wind turbine installation platform, including a platform body, a cross brace and a plurality of vertically extending pile legs, the platform body is provided with a plurality of first channels, each of the first channels vertically penetrates the platform body, and each of the first channels is provided with a pile leg, and the pile leg can move vertically upward and downward; each of the pile legs has a vertically distributed first pile segment and a second pile segment, the first pile segment is located on the upper side of the platform body, and the second pile segment is located on the lower side of the platform body, and is used to directly or indirectly abut against the seabed, the cross brace extends in the horizontal direction, and the two ends of the cross brace are respectively movably connected to the second pile segment of the pile leg on the corresponding side; and can move up and down relative to the second pile segment.

[0006] In the technical solution of the present application, by arranging a horizontally extending cross brace in the second pile section, the bearing capacity of the pile legs for environmental loads such as wave loads in a deep-water environment is improved; the axial stress bearing capacity of the pile legs is improved, and the risk of buckling and instability of the pile legs in a deep-water environment is reduced, thereby improving the stability of the self-elevating installation platform and meeting the support requirements of the self-elevating installation platform in deep-water operations.

[0007] Optionally, a first lifting device is further included to drive the cross brace to move up and down along the extension direction of the pile legs; the first lifting device is fixedly connected to at least one end of the cross brace. By arranging the first lifting device to drive the cross brace to move up and down vertically, it can be adapted to different lengths of the second pile segment, so as to always be located at a position of the second pile segment that is prone to buckling.

[0008] In a specific embodiment, the first lifting device includes a driving part, a first fixing frame, and a first gear set rotatably connected to the first fixing frame, the first gear set is in driving connection with the driving part; the first fixing frame is sleeved on the outside of the corresponding second pile segment, the second pile segment is fixedly connected with a rack, the rack extends vertically, and the gear set is meshed with the rack. By adopting the method of gear and rack meshing to drive the cross brace to move relative to the second pile segment, the accuracy of the height adjustment of the cross brace is improved, and the connection strength between the cross brace and the pile leg is improved.

[0009] Optionally, the platform body is provided with a second lifting device, the second lifting device includes a driving motor, a second fixed frame, and a second gear set rotatably connected to the second fixed frame, the second gear set is drivingly connected to the driving motor; the second fixed frame is fixed to the platform body, part of the first pile segment is located in the second fixed frame, the rack extends to the first pile segment, and is adapted to the gear set provided on the second lifting device. In this way, the first lifting device and the second lifting device share the rack provided on the pile legs to drive the pile legs and the cross brace to move, thereby simplifying the structure of the pile legs.

[0010] Optionally, a support structure for supporting the crane assembly is further included, one end of which is fixedly connected to the platform body, and the other end of which extends upward to the upper part of the platform body; the support structure is enclosed by a second vertically extending channel, the second channel is connected to one of the first channels, and a portion of the first pile section is located in the second channel. By adopting this method, the crane assembly is decoupled from the pile legs and the platform body, and the lifting height capacity of the crane assembly is realized, which is more suitable for the lifting requirements of high-height wind turbines.

[0011] Optionally, the lower surface of the platform body is further provided with a plurality of storage channels for storing the transverse braces, the storage channels are vertically concave in the direction close to the upper surface of the platform body; each storage channel extends in the horizontal direction and is connected to the first channel on the corresponding side. By providing a storage platform to store the transverse braces, when the installation platform is in a sailing condition, the transverse braces are stored in the storage channels, thereby avoiding interference of the pile legs and the transverse braces with the sailing condition of the installation platform.

[0012] Optionally, the pile legs are triangular trusses, and the first fixing frame and the pile legs form a triangular structure. By using triangular trusses as pile legs, the anti-buckling capacity of the pile legs can be increased.

[0013] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0015] Figure 1 is a structural schematic diagram of an offshore wind turbine installation platform in a working condition according to an embodiment of the present invention;

[0016] Figure 2 is a structural schematic diagram of an offshore wind turbine installation platform in a sailing condition according to an embodiment of the present invention;

[0017] Figure 3 A top view of a partial structure of an offshore wind turbine installation platform according to an embodiment of the present invention;

[0018] Figure 4 It is a top view of a connection method of the cross brace;

[0019] Figure 5 This is a top view of another connection method of the cross brace.

[0020] Reference numerals:

[0021] 1- platform body; 11- first channel; 1a- upper surface; 1b- lower surface; 2- cross brace; 2a- short side cross brace; 2b- long side cross brace; 2c- connecting beam; 3- pile leg; 31- first pile section; 32- second pile section; 41- first lifting device; 411- first fixed frame; 42- second lifting device; 43- third lifting device; 5- supporting structure; 6- storage channel; 7- crane assembly; 71- boom; 72- base; 73- counterweight arm. DETAILED DESCRIPTION

[0022] Please refer to Figures 1 to 5 , Figure 1 is a structural schematic diagram of an offshore wind turbine installation platform in a working condition according to an embodiment of the present invention; Figure 2 is a structural schematic diagram of an offshore wind turbine installation platform in a sailing condition according to an embodiment of the present invention; Figure 3 A top view of a partial structure of an offshore wind turbine installation platform according to an embodiment of the present invention; Figure 4 is a top view of a connection mode of the cross brace 2; Figure 5 It is a top view of another connection mode of the cross brace 2.

[0023] The present invention provides an offshore wind turbine installation platform. By improving the structure of the offshore wind turbine installation platform, the adaptability of the self-elevating wind turbine installation platform to 100-meter deep-water operations is improved, the anti-buckling capacity of the large-height pile legs 3 is improved, the stability of the self-elevating installation platform is improved, and the support requirements of the self-elevating installation platform in deep-water operations are met.

[0024] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0026] As shown in the figure, the present invention provides an offshore wind turbine installation platform, including a platform body 1, a cross brace 2 and a plurality of vertically extending pile legs 3. The platform body 1 has an upper surface 1a and a lower surface 1b arranged opposite to each other in the vertical direction, wherein "up" refers to the direction away from the seabed and toward the water surface, and "down" refers to the direction pointing to the seabed. The platform body 1 is provided with a plurality of first channels 11, each of which vertically penetrates the platform body 1, and each of which is provided with a pile leg 3, and the pile leg 3 can move vertically upward and downward. Each pile leg 3 has a first pile segment 31 and a second pile segment 32 distributed vertically. With reference to the upper surface 1a of the platform body 1, the first pile segment 31 is located on the upper side of the upper surface 1a, that is, the first pile segment 31 is located on the upper side of the platform body 1, and the second pile segment 32 is located on the lower side of the upper surface 1a, that is, the second pile segment 32 is located on the lower side of the platform body 1, and is used to directly or indirectly abut against the seabed.

[0027] The offshore wind turbine installation platform has a navigation condition and a working condition. In the navigation condition, most or all of the pile legs 3 are located on the upper side of the platform body 1, and the platform body 1 floats to the sea surface; in the working condition, the pile legs 3 extend downward from the platform body 1 until they directly or indirectly contact the seabed to lift the platform body 1 upward to a position away from the sea surface. At this time, the pile legs 3 play a supporting role for the platform body 1.

[0028] In this embodiment, the offshore wind turbine installation platform is further provided with a cross brace 2, which can be a square steel, a round steel or a truss structure, and the extension direction of the support rod is perpendicular to the extension direction of the pile leg 3, that is, it extends in the horizontal direction, and the two ends of the cross brace 2 are respectively movably connected to the second pile segment 32 of the pile leg 3 on the corresponding side, and can move up and down relative to the second pile segment 32. In this embodiment, the cross brace 2 is located on the lower side of the upper surface 1a of the platform body 1, that is, whether in the navigation condition or the working condition, the cross brace 2 will not pass through the upper surface 1a of the platform body 1.

[0029] In the technical solution of the present application, by providing a horizontally extending cross brace 2 in the second pile section 32, the bearing capacity of the pile legs 3 for environmental loads such as wave loads in a deep water environment is improved; the axial stress bearing capacity of the pile legs 3 is improved, and the risk of buckling and instability of the pile legs 3 in a deep water environment is reduced, thereby improving the stability of the self-elevating installation platform and meeting the support requirements of the self-elevating installation platform in deep water operations.

[0030] The manner in which the cross brace rod 2 moves up and down relative to the second pile segment 32 is described in detail below.

[0031] In a specific embodiment, the offshore wind turbine installation platform further includes a first lifting device 41, which is used to drive the cross brace 2 to move up and down along the extension direction of the pile legs 3; each first lifting device 41 is fixedly connected to at least one end of a cross brace 2. The height of the cross brace 2 is adjusted by the first lifting device 41, and the cross brace 2 can also be locked at a set height by the first lifting device 41.

[0032] The first lifting device 41 is provided to drive the cross brace 2 to move vertically up and down, so as to adapt to different lengths of the second pile segment 32, so as to always be located at the position where the second pile segment 32 is prone to buckling. Specifically, these methods can be used to determine the position where the pile leg 3 is prone to buckling. It is necessary to use numerical methods such as finite element analysis (FEA) to perform buckling analysis on the pile leg 3 according to the specific water depth and wave conditions, seabed support environment (soil adjustment, installation platform support conditions, such as soil or support platform stiffness, bearing capacity, friction coefficient and other parameters). By simulating the stress state of the pile leg 3 under different water depths, wave loads and soil conditions, the position where the pile leg 3 is prone to buckling can be predicted.

[0033] In the actual operation process, under working conditions, the pile legs 3 are first lowered to support the platform body 1, and then the cross brace 2 is controlled to move down to the set position. Of course, after the pile legs 3 are lowered to a certain height, the first layer of cross brace 2 is moved down to ensure the anti-buckling ability of the second pile segment 32 within the height range; then the pile legs 3 are further lowered to a certain height, and then the second layer of cross brace 2 is lowered to the corresponding position; it is also possible that the cross brace 2 and the pile legs 3 are lowered at the same time, and the ratio of the lowering speeds of the cross brace 2 and the pile legs 3 is controlled to control the distance ratio of the lowering distances of the cross brace 2 and the pile legs 3.

[0034] As an implementable method of the first lifting device 41, the first lifting device 41 includes a driving unit, a first fixed frame 411, and a first gear set rotatably connected to the first fixed frame 411, and the first gear set is connected to the driving unit in a transmission manner; the first fixed frame 411 is sleeved on the outside of the corresponding second pile segment 32, and the second pile segment 32 is fixedly connected with a rack, the rack extends vertically, and the gear set is meshed with the rack. The driving unit can receive external instructions to drive the first gear set to output positive torque or negative torque outward, and the first gear set is meshed with the rack so that the first gear set drives the cross brace 2 to move up and down along the second pile segment 32. The driving unit stops working when receiving external instructions, and the first gear set cannot rotate, thereby locking the first fixed frame 411 to a set height.

[0035] As another possible implementation of the first lifting device 41, the first driving device can be a motor. Of course, the first driving device can also be a hoisting mechanism. The hoisting mechanism has a fixed end and a telescopic end. The fixed end is connected to the platform body 1, and the telescopic end is connected to the first fixed frame 411. The first fixed frame 411 and the second pile section 32 are meshed in a gear rack. In this embodiment, the first gear set can accept external instructions to switch between the unlocked position and the locked position. In the unlocked position, the first gear set can rotate freely. Driven by the hoisting mechanism, the first fixed frame 411 can move to the set position. After reaching the set position, the first gear set switches to the locked position. In the locked position, the first gear set cannot rotate, so as to cooperate with the rack to lock the first fixed frame 411 at the set height. Those skilled in the art can also choose other structures of the first lifting device 41 to achieve the height position of the control cross brace 2.

[0036] By adopting the gear rack meshing mode to drive the cross brace 2 to move relative to the second pile section 32, the accuracy of height adjustment of the cross brace 2 is improved, and the connection strength between the cross brace 2 and the pile leg 3 is improved.

[0037] Optionally, the lower surface 1b of the platform body 1 is further provided with a plurality of receiving channels 6 for receiving the cross braces 2, and the receiving channels 6 are vertically concave toward the upper surface 1a of the platform body 1; each receiving channel 6 extends in the horizontal direction and is connected to the first channel on the corresponding side. When each cross brace is projected from bottom to top in the height direction, the projection range formed on the lower surface 1b of the platform body 1 coincides with the receiving channel 6.

[0038] By providing a storage platform to store the cross brace 2, when the installation platform is in a sailing condition, the cross brace 2 is stored in the storage channel 6, thereby avoiding interference of the pile legs 3 and the cross brace 2 with the sailing condition of the installation platform.

[0039] In addition, by fixing the end of the cross brace 2 to the protruding end of the first fixing frame 411 , the supporting strength of the first fixing frame 411 on the cross brace 2 is increased.

[0040] The connection method between the pile legs 3 and the cross braces in the present application is illustrated below with multiple different implementations. In the following implementations, the pile legs 3 are triangular truss structures. By using triangular trusses as the pile legs 3, the anti-buckling capacity of the pile legs 3 can be increased.

[0041] In an achievable manner, in the embodiment shown in the figure, the platform body 1 is approximately a rectangular structure, and is provided with four first channels 11, which are correspondingly located at the four corners of the rectangular structure to form a stable support for the platform body 1. A pile leg 3 is inserted in each first channel 11.

[0042] At least one cross brace 2 is connected between two adjacent pile legs 3. Four cross braces 2 are arranged at the same horizontal height. The four cross braces 2 are connected end to end in sequence to form a closed rectangular structure.

[0043] Optionally, two of the four cross braces 2 are defined as the long sides of the rectangular structure as long side cross braces 2b, and the other two are defined as the short sides of the rectangular structure as short side cross braces 2a. A connecting beam 2c is also included, one end of the connecting beam 2c is fixedly connected to the midpoint of a long side cross brace 2b, and the other end is fixedly connected to the midpoint of another long side cross brace 2b. The connecting beam 2c is parallel to the short side cross brace 2a, thereby further increasing the anti-buckling capacity of the pile leg 3.

[0044] In another achievable manner, the platform body 1 is provided with at least three first channels 11, and the three first channels 11 constitute the three vertices of a triangle. At least one cross brace 2 is connected between two adjacent pile legs 3, and three cross braces 2 are provided at the same horizontal height, and the three cross braces 2 are connected end to end in sequence to form a closed triangle structure.

[0045] In each of the above-mentioned embodiments, as another optional manner, an adapter frame is also connected to the outer side of the first fixing frame 411, and the end of the cross brace 2 is fixed to the first fixing frame 411 through the adapter frame. The first fixing frame 411 is located inside the adapter frame, and the top and bottom ends of the first fixing frame 411 are welded and fixed to the adapter frame. The side walls are spaced or abutted against the inside of the adapter frame to form a direct or indirect fixed connection; the cross-section of the adapter frame in the horizontal direction is rectangular or triangular.

[0046] As another embodiment, the cross braces 2 connected to the same two second pile sections 32 are vertically distributed in sequence. As shown in the example in the figure, two cross braces 2 are arranged in the height direction, and the two cross braces 2 are arranged at intervals in the height direction.

[0047] In the above-mentioned embodiment, the offshore wind turbine installation platform also includes a second lifting device 42. The structure of the second lifting device 42 is similar to that of the first lifting device 41. The second lifting device 42 includes a driving motor, a second fixed frame, and a second gear set rotatably connected to the second fixed frame. The second fixed frame is fixed to the platform body 1, and part of the first pile segment 31 is located in the second fixed frame; the second gear set is connected to the driving motor in a transmission manner, and the second fixed frame encloses a vertically extending area, part of the first pile segment 31 is located in the area, and the second gear set is also located in the area and meshes with the rack. In this embodiment, the rack set on the second pile segment 32 extends to the first pile segment 31 and is adapted to the gear set set on the second lifting device 42. In this way, the first lifting device 41 and the second lifting device 42 share the rack set on the pile leg 3 to drive the pile leg 3 and the cross brace 2 to move, thereby simplifying the structure of the pile leg 3.

[0048] With the transformation of the global energy structure and the rapid development of offshore wind power technology, the increase in the capacity of offshore wind power units has become an obvious trend, aiming to improve power generation efficiency and reduce the cost per kilowatt-hour. However, in order to meet the demand for larger unit capacity, the length of wind turbine blades must be increased accordingly to capture more wind energy. At the same time, in order to optimize the wind capture efficiency of the wind turbine, the wind capture area of ​​the blades also needs to be expanded accordingly. In addition, in order to further improve the power generation efficiency and stability of the wind turbine, the center height of the wind turbine hub is also constantly increasing, resulting in a significant increase in the height of the entire wind turbine. The traditional self-elevating installation platform has limited lifting capacity and can no longer meet the installation needs of taller wind turbines in the future.

[0049] In some other embodiments of the present application, the offshore wind turbine installation platform also includes a support structure 5 for supporting a crane assembly 7, one end of the support structure 5 is fixedly connected to the platform body 1, and the other end extends upward to the upper part of the platform body 1; the support structure 5 is a triangular truss structure, and a second vertically extending channel is enclosed and defined in the support structure 5, and the second channel is vertically opposite to and connected to at least one of the first channels 11, and the vertical projection range of the second channel coincides with or covers the first channel 11, so that the first pile segment 31 can be inserted into the second channel after passing through the first channel 11, so that at least part of the first pile segment 31 is located in the second channel, and the support structure 5 is sleeved to the outside of the first pile segment 31, and when the pile leg 3 moves up and down, the first pile segment 31 moves relative to the support structure 5 in the support structure 5; the crane assembly 7 is sleeved on the outside of the support structure 5, and can move up and down along the support structure 5 to lift and lock at a set height of the support structure 5.

[0050] By adopting this method, the crane assembly 7 is decoupled from the pile legs 3 and the platform body 1, thereby achieving the lifting height capability of the crane assembly 7, which is more suitable for the lifting requirements of high-height wind turbines.

[0051] In a specific example, the crane assembly 7 includes a boom 71 and a base 72. The base 72 is an annular structure with a cavity in the middle. The base 72 is sleeved on the outer side of the support structure 5, and its inner ring side can be spaced apart from the support structure 5 in the horizontal direction, or can form a direct or indirect sliding fit.

[0052] It also includes a third lifting device 43, which includes a third fixed frame, which is sleeved on the outside of the supporting structure 5. A third gear set is rotatably connected inside the third fixed frame, and the third gear set is transmission-connected to a driving motor. The third gear set is meshed with a rack fixed to the supporting structure 5, and the rack set on the supporting structure 5 also extends vertically.

[0053] The third lifting device 43 is fixedly connected to the base 72. As an optional method, the outer side of the third fixing frame can be fixedly connected to the inner circle side of the base 72. Here, "inside" refers to the side pointing to the center of the support device, and "outside" refers to the opposite direction. In this way, in the horizontal direction, the support device is located on the inner side of the third fixing frame, and the third fixing frame is located between the support device and the base 72.

[0054] As another optional method, the base 72 is fixedly connected to the top of the third fixing frame, and the inner ring side of the base 72 is guided and matched with the part of the support structure 5 located outside the third fixing frame. In this way, the inner ring side of the base 72 is slidably matched with the support structure 5, and the support structure 5 plays a guiding role on the base 72. The guiding matching method can be a gear rack meshing method, a rolling matching method, or a sliding matching method, which can be selected by those skilled in the art.

[0055] The outer ring of the base 72 can rotate in the horizontal plane relative to the inner ring, thereby driving the arm 71 to rotate in the horizontal plane, thereby forming a pile-circling crane. At the same time, the arm 71 can rotate in the vertical plane relative to the base 72 to perform a lifting operation.

[0056] Furthermore, the crane assembly 7 also includes a counterweight arm 73 connected to the base 72, and the counterweight arm 73 is arranged relative to the crane arm 71 on a horizontal plane. By setting the counterweight arm 73, the support structure 5 can be minimized from being subjected to excessive bending moment during the empty hook and the hoisting process of the crane. Among them, one counterweight arm 73 can be set, and more counterweight arms 73 can also be set.

[0057] As a feasible counterweight method, the crane assembly 7 is provided with two counterweight arms 73, the two counterweight arms 73 have different positions of the farthest ends extending outward in the horizontal direction, and the two counterweight arms 73 have different vertical heights to improve the adaptability with the boom 71.

[0058] The counterweight arm 73 includes a first arm section having one end rotatably connected to the base 72, the other end of the first arm section being hinged to one end of the second arm section, and the other end of the second arm section being used to lift the counterweight; the offshore wind turbine installation equipment also includes a driving hydraulic component, one of the cylinder and the piston of the driving hydraulic component is connected to the base 72, and the other is connected to the second arm section to push the second arm section outward or pull it back.

[0059] By adopting the counterweight arm 73 structure in this embodiment, the first arm section, the second arm section and the driving hydraulic parts form a triangular structure, and the distance between the counterweight and the center of the crane is changed by the extension and retraction of the hydraulic push rod. The counterweight is a structure of stacked weights, composed of multiple super-lifting counterweight blocks, thereby balancing the center of gravity of the crane.

[0060] As another way to achieve counterweight, the base 72 is provided with a counterweight push rod, one end of which is located in the base 72 and connected to a driving member arranged in the base 72, and the other end of the push rod is provided with a counterweight. The counterweight and the push rod are arranged opposite to the boom 71 in the horizontal direction, and the push rod can be pushed outward from the base 72 a set distance to adapt to the boom 71.

[0061] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An offshore wind turbine installation platform, characterized in that: The invention comprises a platform body (1), a cross brace (2) and a plurality of vertically extending pile legs (3), wherein the platform body (1) is provided with a plurality of first channels (11), each of the first channels (11) vertically penetrating the platform body (1), each of the first channels (11) being provided with a pile leg (3), and the pile leg (3) being able to move vertically upward and downward; each of the pile legs (3) has a first pile segment (31) and a second pile segment (32) distributed vertically, wherein the first pile segment (31) is located on the upper side of the platform body (1), and the second pile segment (32) is located on the lower side of the platform body (1), and is used for directly or indirectly pressing against the seabed; The cross brace (2) extends in a horizontal direction, and both ends of the cross brace (2) are respectively connected to the second pile section (32) of the pile leg (3) on the corresponding side, and can move up and down relative to the second pile section (32).

2. The offshore wind turbine installation platform according to claim 1, characterized in that: Two adjacent pile legs (3) are connected to the cross bracing rod (2), and the cross bracing rods (2) located in the same plane form a closed structure.

3. The offshore wind turbine installation platform according to claim 1, characterized in that: The transverse braces (2) connected to the same two second pile sections (32) are spaced apart in sequence along the vertical direction.

4. The offshore wind turbine installation platform according to any one of claims 1 to 3, characterized in that: It also comprises a first lifting device (41) for driving the cross brace (2) to move up and down along the extension direction of the pile leg (3), and each of the first lifting devices (41) is fixedly connected to at least one end of the cross brace (2).

5. The offshore wind turbine installation platform according to claim 4, characterized in that: The first lifting device (41) comprises a driving part, a first fixing frame (411), and a first gear set connected to the first fixing frame (411), the first gear set being in transmission connection with the driving part; The first fixing frame (411) is sleeved on the outside of the second pile segment (32), the second pile segment (32) is fixedly connected with a rack, the rack extends vertically, and the first gear set is meshed with the rack.

6. The offshore wind turbine installation platform according to claim 5, characterized in that: The platform body (1) is provided with a second lifting device (42), the second lifting device (42) comprising a driving motor, a second fixing frame and a second gear set connected to the second fixing frame, the second gear set being drivingly connected to the driving motor; The second fixing frame is fixed to the platform body (1), a portion of the first pile segment (31) is located in the second fixing frame, and the rack extends to the first pile segment (31) and meshes with the second gear set.

7. The offshore wind turbine installation platform according to claim 4, characterized in that: It also includes a support structure (5) for supporting a crane assembly (7), one end of the support structure (5) being fixedly connected to the platform body (1), and the other end of the support structure (5) extending upward to the upper part of the platform body (1), and the crane assembly (7) being sleeved on the outer side of the support structure (5) and being able to move up and down along the support structure (5); The support structure (5) is enclosed within a second channel extending vertically, the second channel being connected to one of the first channels (11), and part or all of the first pile segment (31) is located within the second channel.

8. The offshore wind turbine installation platform according to claim 4, characterized in that: The lower surface of the platform body (1) is also provided with a plurality of storage channels (6) for storing the cross bracing rods (2), wherein the storage channels (6) are recessed in a vertical direction toward the upper surface of the platform body (1); each storage channel (6) extends in a horizontal direction and is connected to the first channel (11) on the corresponding side.

9. The offshore wind turbine installation platform according to claim 5, characterized in that: The pile leg (3) is a triangular truss, and the first fixing frame (411) and the pile leg (3) form a triangular structure.

10. The offshore wind turbine installation platform according to claim 5, characterized in that: It also comprises an adapter frame, through which the end of the cross brace (2) is fixed to the first fixing frame (411), and the first fixing frame (411) is fixedly connected to the inner side of the adapter frame.

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