Offshore wind turbine pile group structure suitable for complex geology and installation method of offshore wind turbine pile group structure

Abstract

The invention relates to the technical field of offshore wind power foundation engineering, in particular to an offshore wind turbine pile group structure suitable for complex geology and a mounting method of the offshore wind turbine pile group structure. The offshore wind turbine pile group structure suitable for the complex geology comprises guide assemblies and a pile group system frame, wherein each guide assembly is composed of a steel pipe pile guide sleeve, a jacket guide sleeve and a connecting ring plate, and the pile group system frame integrates the multiple guide assemblies through a connecting frame. The modular overall pile group structure design is achieved through the pile group system frame integrating the multiple guide assemblies and the connecting frame, the fan load is dispersed to the multiple pile foundations through the pile group synergistic effect, and therefore the bearing capacity of the whole foundation is improved, the foundation can adapt to different seabed geological conditions, and the construction efficiency is improved. The development requirement of offshore wind power in a complex environment is met, efficient installation, high bearing capacity and geological adaptability optimization of the offshore wind turbine foundation are achieved, stable support is provided for an offshore wind turbine generator, the construction cost is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of offshore wind power foundation engineering technology, and in particular to an offshore wind turbine pile structure suitable for complex geological conditions and its installation method. Background Technology

[0002] In recent years, in order to address global warming and achieve sustainable energy development, the world has vigorously developed new clean energy sources. Wind power, as the most technologically mature, scalable, and commercially viable power generation method in the new energy field, has experienced rapid growth. With wind turbines extending from onshore to offshore, offshore wind power is becoming a key focus of new energy development.

[0003] Currently, the main technologies used for offshore wind turbine foundations are as follows:

[0004] 1. Monopile foundation: Suitable for shallow geological conditions. It addresses deep soft soil or bedrock conditions by increasing the pile diameter or the depth of penetration into the mud to meet the wind turbine fixing requirements. However, when encountering thicker soft soil layers or bedrock, this method can lead to excessively large pile diameters and excessively deep penetration into the mud, which significantly increases construction costs and correspondingly increases construction difficulty.

[0005] 2. Three-pile / four-pile jacket foundation: The jacket foundation distributes the wind turbine load to multiple piles. Its disadvantage is that the number of piles is the same as the number of jacket legs, requiring larger pile diameters and deeper penetration depths when the wind turbine reaction force and marine environmental loads are significant.

[0006] 3. Gravity foundation: Relying on its own weight to maintain stability, it requires a high degree of seabed flatness and is generally suitable for areas with relatively flat seabeds and no thick soft soil layer. In soft soil environments, its settlement is difficult to control, and its stability is insufficient, limiting its application range.

[0007] Therefore, the basic technologies currently used in offshore wind turbines often have the following major shortcomings:

[0008] Insufficient bearing capacity: Single pile foundations are prone to settlement problems in complex geological conditions; although three-pile / four-pile jacket foundations can distribute the load, they are directly inserted into steel piles on the same site, and the number of piles is limited, which makes it difficult to meet the bearing capacity requirements of foundations in deep-water development and complex geological conditions.

[0009] Poor adaptability: Traditional offshore wind turbine foundation structures require the driving of a corresponding number of piles according to the jacket legs, making it difficult to dynamically adjust the pile spacing or number of pile groups according to different seabed geological conditions (such as soft soil, sand layers, bedrock, etc.). This makes it difficult to flexibly match the ever-changing and complex geological conditions. In special geological environments, large-scale geological improvement or special pile foundation forms are often required, which increases construction costs and difficulties.

[0010] Low construction efficiency: The multi-step installation process relies on an additional positioning system. To ensure installation accuracy, repeated positioning is required. Offshore operations are greatly affected by environmental factors, resulting in high risks. Construction progress is difficult to control and is prone to delays due to adverse sea conditions, extending the construction period and increasing construction costs. Summary of the Invention

[0011] This application provides a pile group structure for offshore wind turbines suitable for complex geological conditions and its installation method, in order to solve the problems of insufficient bearing capacity, poor adaptability and low construction efficiency of traditional foundation technologies in the prior art.

[0012] This application provides a pile structure for offshore wind turbines suitable for complex geological conditions, including:

[0013] A guiding assembly consisting of a steel pipe pile guide sleeve, a guide sleeve for the guide frame, and a connecting ring plate, and a pile group system frame integrating multiple guiding assemblies through a connecting frame, wherein:

[0014] Both the guide sleeve for the steel pipe pile and the guide sleeve for the guide frame are equipped with guide sections, shear keys, and reserved grouting system components.

[0015] The connecting ring plate is disposed around the periphery of the guide sleeve of the steel pipe pile and the guide sleeve of the guide frame;

[0016] The connecting frame connects multiple guide sleeves of the guide frame by multiple frame chords.

[0017] Preferably, multiple steel pipe pile guide sleeves can be provided in the guide assembly, with at least two;

[0018] Multiple steel pipe pile guide sleeves are arranged around the periphery of the guide sleeve of the guide frame.

[0019] Preferably, the shear key includes a horizontal shear key and a vertical shear key.

[0020] Preferably, the horizontal shear keys are arranged in an axial array along the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame;

[0021] The vertical shear keys are arranged in a circumferential array along the guide sleeve of the steel pipe pile or the guide sleeve of the jacket.

[0022] Preferably, the vertical shear key includes at least an upper shear segment and a lower shear segment, and the horizontal shear keys are linearly arrayed on the inner wall of the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame.

[0023] Preferably, the grouting system components include a waterproof diaphragm and a grouting packer;

[0024] The waterproof diaphragm includes a first waterproof diaphragm disposed at the guide section of the guide sleeve of the steel pipe pile or the guide section of the guide sleeve of the guide frame and a second waterproof diaphragm disposed at the bottom of the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame.

[0025] The bottom end of the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame is also provided with the grouting sealer.

[0026] Preferably, the connecting ring plate includes at least an upper yoke plate and a lower yoke plate, which are symmetrically arranged on the outer surfaces of the steel pipe pile guide sleeve and the guide sleeve of the guide frame.

[0027] Preferably, the frame chord includes an upper frame chord and a lower frame chord, and a frame A-frame brace is also provided between the upper frame chord and the lower frame chord.

[0028] Preferably, the pile group structure further includes an anti-sinking plate and a connecting plate, wherein the anti-sinking plate is disposed below the lower chord of the frame;

[0029] The connecting plate is provided between any of the steel pipe pile guide sleeves and the guide sleeve of the guide frame.

[0030] This application also provides an installation method for offshore wind turbine pile groups suitable for complex geological conditions based on any of the above, including:

[0031] Step S1: Transport the pile group system frame to the site and hoist it to the seabed positioning point using the installation lifting points;

[0032] Step S2: Drive the corresponding steel pipe pile into the guide sleeve of the steel pipe pile to the predetermined depth;

[0033] Step S3: Grouting and curing are performed on the gap between the steel pipe pile and the guide sleeve of the steel pipe pile;

[0034] Step S4: Insert the wind turbine jacket into the pile group system frame along the guide section of the jacket guide sleeve;

[0035] Step S5: Grouting and curing are performed on the gap between the guide frame and the guide sleeve of the guide frame.

[0036] The beneficial effects of this application are as follows:

[0037] This application presents a pile group structure for offshore wind turbines suitable for complex geological conditions. It achieves a modular overall pile group structure design by integrating multiple guiding components and connecting frames into a pile group system framework. This allows for the simultaneous positioning of all pile foundations without additional repetitive positioning steps. Simultaneously, through the synergistic effect of the pile group, the wind turbine load is distributed across multiple pile foundations, effectively reducing the load borne by a single pile and thus improving the overall bearing capacity of the foundation. This enables the foundation to adapt to different seabed geological conditions, meeting the development needs of offshore wind power in complex environments. It achieves efficient installation, high bearing capacity, and optimized geological adaptability of offshore wind turbine foundations, providing stable support for offshore wind turbine units, reducing construction costs, and improving construction efficiency.

[0038] Furthermore, by setting multiple steel pipe pile guide sleeves around the jacket guide sleeve according to different installation requirements, a corresponding number of piles are driven in to achieve the synergistic effect of the pile group, distributing the wind turbine load to multiple piles, effectively reducing the load borne by a single pile, thereby improving the bearing capacity of the entire foundation, enabling it to adapt to complex and varied seabed geological conditions, such as different combinations of strata such as soft soil, sand, and bedrock, and ensuring the stability of the wind turbine during operation;

[0039] In particular, the application of directional design in the integrated structural design and directional components eliminates the need for additional repetitive positioning steps during the installation of pile foundations and jackets. The overall positioning of the pile group can be achieved with a single positioning. At the same time, the presence of directional components provides guidance for the pile group system framework itself, assisting in the precise positioning and installation of subsequent construction. This reduces the investment in construction equipment, lowers construction complexity, shortens the installation period, improves construction efficiency, reduces offshore operation time, and reduces construction risks. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 An overall top view of an offshore wind turbine pile group structure suitable for complex geological conditions, provided in an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of the overall structure of the pile group structure provided in the embodiments of this application;

[0043] Figure 3 This is a top view of the overall structure of another embodiment of the pile group structure provided in this application.

[0044] Figure 4 This is an overall structural cross-sectional view of the pile group structure provided in the embodiments of this application;

[0045] Figure 5 A cross-sectional schematic diagram of the steel pipe pile guide sleeve provided in the embodiments of this application;

[0046] Figure 6 This is a schematic diagram of the structure of the vertical shear key provided in the embodiments of this application;

[0047] Figure 7 This is a schematic diagram of the installation position of the mounting point provided in the embodiments of this application;

[0048] Figure 8 A flowchart illustrating an installation method for an offshore wind turbine pile group structure suitable for complex geological conditions, provided in this application embodiment.

[0049] Figure label:

[0050] 1. Steel pipe pile guide sleeve; 2. Guide sleeve for guide frame; 3. Connecting ring plate; 31. Upper yoke plate; 32. Lower yoke plate; 4. Connecting frame; 41. Upper chord of frame; 42. Lower chord of frame; 43. A-frame brace of frame; 5. Guide section; 6. Horizontal shear key; 7. Vertical shear key; 8. Waterproof diaphragm; 9. Grouting packer; 10. Connecting plate; 11. Installation lifting point. Detailed Implementation

[0051] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] The following is combined Figures 1-7 This application describes the offshore wind turbine pile structure and its installation method suitable for complex geological conditions provided in the embodiments of this application.

[0053] Reference Figure 1 and Figure 7 As shown in the embodiment of this application, the offshore wind turbine pile group structure suitable for complex geological conditions includes a guide assembly composed of a steel pipe pile guide sleeve 1, a jacket guide sleeve 2, and a connecting ring plate 3, and a pile group system frame integrating multiple guide assemblies through a connecting frame 4, wherein:

[0054] Both the steel pipe pile guide sleeve 1 and the guide sleeve 2 of the guide frame are equipped with guide section 5, shear key and reserved grouting system components. The guide section 5 is a funnel-shaped structure set at the top of the steel pipe pile guide sleeve 1 or the guide sleeve 2 of the guide frame, to assist the staff in positioning and guiding the initial insertion of the corresponding pile foundation or guide frame.

[0055] The connecting ring plate 3 surrounds the steel pipe pile guide sleeve 1 and the guide sleeve 2 of the guide frame, and is used to connect the steel pipe pile guide sleeve 1 and the guide sleeve 2 of the guide frame to form a guide assembly.

[0056] The connecting frame 4 is used to fix and connect multiple guide sleeves 2 of the guide frame through multiple frame chords.

[0057] The pile group structure also includes installation lifting points 11, distributed on the pile group system frame for hoisting and transporting it.

[0058] The modular overall pile structure design is achieved by integrating multiple guiding components and connecting frames 4 into a pile system framework. This allows for the simultaneous positioning of all pile foundations without the need for additional repetitive positioning steps. Simultaneously, through the synergistic effect of the piles, the wind turbine load is distributed across multiple pile foundations, effectively reducing the load borne by a single pile and thus improving the overall bearing capacity of the foundation. This enables the foundation to adapt to different seabed geological conditions, meeting the development needs of offshore wind power in complex environments. It achieves efficient installation, high bearing capacity, and optimized geological adaptability of offshore wind turbine foundations, providing stable support for offshore wind turbine units, reducing construction costs, and improving construction efficiency.

[0059] By setting multiple steel pipe pile guide sleeves 1 around the guide sleeve 2 of the jacket frame according to different installation requirements, a corresponding number of piles are driven in to achieve the synergistic effect of the pile group, and the wind turbine load is distributed to multiple piles, which effectively reduces the load borne by a single pile, thereby improving the bearing capacity of the entire foundation and enabling it to adapt to complex and varied seabed geological conditions, such as different combinations of strata such as soft soil, sand layer, and bedrock, and ensuring the stability of the wind turbine during operation.

[0060] By employing an integrated structural design and guiding design within the guiding components, the installation of the pile foundation and jacket structure eliminates the need for additional repetitive positioning steps. A single positioning operation can achieve the overall positioning of the pile group. Simultaneously, the guiding components provide guidance for the pile group system framework itself, assisting in precise positioning and installation during subsequent construction. This reduces the investment in construction equipment, lowers construction complexity, shortens the installation period, improves construction efficiency, reduces offshore operation time, and lowers construction risks.

[0061] Please continue reading. Figure 2 and Figure 3 ,like Figure 2 and Figure 3As shown, where, Figure 2 This is a schematic diagram of the overall structure of the pile group structure provided in the embodiments of this application. Figure 3 This is a top view of the overall structure of another embodiment of the pile group structure provided in this application.

[0062] In some specific embodiments, multiple steel pipe pile guide sleeves 1 in the guide assembly may be provided, with at least two;

[0063] Multiple steel pipe pile guide sleeves 1 are arranged around the outer perimeter of the guide sleeve 2 of the guide frame.

[0064] For example Figure 1 and Figure 3 The diagrams shown illustrate the positional distribution of various structures within the guiding assembly when there are two and three steel pipe pile guide sleeves, respectively. The actual number of steel pipe pile guide sleeves 1 can be selected based on the actual geological conditions of the seabed at the installation site and the installation requirements. The presence of multiple steel pipe pile guide sleeves 1 surrounding the jacket guide sleeve 2 allows the pile group structure to drive multiple steel pipe piles as the foundation for subsequent wind turbine installation, according to actual installation needs and seabed geological conditions. Through the synergistic effect of the pile group, the wind turbine load is distributed across multiple pile foundations, effectively reducing the load borne by a single pile, thereby improving the overall bearing capacity and stability of the foundation. This provides stable support and higher bearing capacity for the offshore wind turbine, ensuring its stable operation and enabling it to adapt to complex and varied seabed geological conditions, such as soft soil, sand layers, bedrock, and other geological combinations, thus guaranteeing the stability of the wind turbine during operation. Please continue reading... Figures 4 to 6 In some specific embodiments, the shear key includes a horizontal shear key 6 and a vertical shear key 7.

[0065] Shear keys are protruding structures installed on the inner wall of the guide sleeve to enhance the shear resistance of the sleeve and the pile / column frame. The horizontal shear key 6 is an annular protrusion tightly attached to the inner wall of the guide sleeve, and the vertical shear key 7 is a strip-shaped protrusion tightly attached to the inner wall of the guide sleeve and parallel to the axis of the corresponding guide sleeve.

[0066] In some specific embodiments, the horizontal shear keys 6 are arranged in an axial array along the guide sleeve 1 of the steel pipe pile or the guide sleeve 2 of the guide frame;

[0067] Vertical shear keys 7 are arranged in a circumferential array along the guide sleeve 1 of the steel pipe pile or the guide sleeve 2 of the guide frame.

[0068] Multiple horizontal shear keys 6 and multiple vertical shear keys 7 are provided. Multiple horizontal shear keys 6 are arranged in an axial array along the corresponding guide sleeve at the corresponding guide sleeve inner wall position. Multiple vertical shear keys 7 are arranged in a circumferential array around the corresponding guide sleeve at the corresponding guide sleeve inner wall position.

[0069] In some specific embodiments, the vertical shear key 7 includes at least an upper shear segment and a lower shear segment, and the horizontal shear keys are linearly arrayed on the inner wall of the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame.

[0070] By using two sets of vertical shear keys 7 arranged vertically and horizontal shear keys 6 evenly distributed on the inner wall of the corresponding guide sleeve, the shear resistance between the steel pipe pile guide sleeve 1 and the pile foundation to be driven later is further enhanced, ensuring a reliable connection between the two. At the same time, by using at least two sets of vertical shear keys 7 arranged vertically, the force transmission between the guide sleeve and the pile or guide leg inside is assisted, preventing stress concentration.

[0071] In some specific embodiments, the grouting system components include a waterproof diaphragm 8 and a grouting packer 9;

[0072] The waterproof diaphragm 8 includes a first waterproof diaphragm 8 disposed at the guide section 5 of the guide sleeve 1 of the steel pipe pile or the guide sleeve 2 of the guide frame and a second waterproof diaphragm 8 disposed at the bottom of the guide sleeve 1 of the steel pipe pile or the guide sleeve 2 of the guide frame.

[0073] The bottom end of the guide sleeve 1 for steel pipe piles or the guide sleeve 2 for guide pipe frame is also equipped with a grouting sealer 9.

[0074] The grouting pressure is maintained by the waterproof diaphragm 8 at the top, and leakage is prevented by the packer at the bottom, forming a closed system to ensure uniform distribution of the grout.

[0075] The waterproof diaphragm 8 and the grouting packer 9 work together to provide a physical sealing and pressure maintenance mechanism for the grouting process. The former provides top sealing and the latter achieves bottom sealing, forming a multi-level protection system to ensure the sealing and strength of the structure and adapt to the complex deep-sea environment.

[0076] In some specific embodiments, the connecting ring plate 3 includes at least an upper yoke plate 31 and a lower yoke plate 32, which are symmetrically arranged on the outer surfaces of the steel pipe pile guide sleeve 1 and the guide sleeve 2 of the guide frame.

[0077] In some specific embodiments, the frame chords include an upper frame chord 41 and a lower frame chord 42, and a frame herringbone brace 43 is also provided between the upper frame chord 41 and the lower frame chord 42. The upper yoke plate 31 and the lower yoke plate 32 are provided between the upper frame chord 41 and the lower frame chord 42.

[0078] The connecting ring plate 3 serves as a key connecting component, used to connect the steel pipe pile guide sleeve 1 and the jacket guide sleeve 2, tightly linking them to form an integrated guiding assembly. Multiple frame chords positioned between the jacket guide sleeves 2 connect these guiding assemblies to form an integrated pile group structure. This creates a unified pile group frame system, enhancing the overall rigidity and stability of the system, preventing deformation or displacement during installation and use. It provides a stable support platform for subsequent wind turbine installation, ensuring the entire pile group system works collaboratively under load to share various wind turbine loads, improving system stability and load-bearing capacity. This allows the system to adapt to a wider range of seabed geological conditions, meeting the installation requirements of wind turbines in complex geological environments.

[0079] In some specific embodiments, the pile group structure also includes an anti-sinking plate and a connecting plate 10, with the anti-sinking plate disposed below the lower chord 42 of the frame;

[0080] A connecting plate 10 is provided between the guide sleeve 1 of any steel pipe pile and the guide sleeve 2 of the guide frame.

[0081] By setting an anti-sinking plate below the lower chord 42 of the frame, the self-settlement of the pile group system frame is limited when it is lowered to the seabed. This is to prevent the device itself from sinking excessively on the seabed and to avoid excessive self-penetration sinking of the integrated pile group system frame in the early stage of installation. At the same time, the load borne by the pile group system frame in the later stage can also be transferred to the seabed more evenly through the anti-sinking plate in contact with the seabed surface, thus limiting its overall sinking range and providing protection for its installation in seabed geology such as soft soil and sand.

[0082] The connecting plate 10 is located between the upper yoke plate 31 and the lower yoke plate 32. The upper and lower sides of the connecting plate 10 are respectively connected to the upper yoke plate 31 or the lower yoke plate 32 at the corresponding positions. The left and right sides of the connecting plate 10 are respectively fixedly connected to the outer surfaces of the corresponding two steel pipe pile guide sleeves 1 and guide sleeves 2 of the guide frame.

[0083] Please continue to refer to this. Figure 8 ,like Figure 8 The diagram shown is a flowchart of an installation method for offshore wind turbine pile structures suitable for complex geological conditions, provided in an embodiment of this application.

[0084] Specifically, this application also provides an installation method for an offshore wind turbine pile group structure suitable for complex geological conditions based on any of the above, including: step S1, transporting the pile group system frame to the site and hoisting it to the seabed positioning point through the installation lifting point 11;

[0085] Step S2: Drive the corresponding steel pipe pile into the steel pipe pile guide sleeve 1 to the predetermined depth;

[0086] Step S3: Grouting and curing are performed into the gap between the steel pipe pile and the steel pipe pile guide sleeve 1;

[0087] Step S4: Insert the wind turbine jacket into the pile group system frame along the guide section 5 of the jacket guide sleeve 2;

[0088] Step S5: Grouting and curing are performed into the gap between the guide frame and the guide sleeve 2.

[0089] The specific installation steps are as follows:

[0090] In step S1: The pile group system frame is hoisted to the designated seabed location using specialized equipment such as a crane vessel, and precisely positioned to ensure that the planar position and elevation of the frame meet the design requirements.

[0091] In step S2: The piling vessel performs piling operations in the steel pipe pile guide sleeve 1 of the pile group system frame. According to the geological conditions and design requirements, a suitable pile hammer and piling technology are selected to drive the steel pipe piles into the seabed until the predetermined mud penetration depth and bearing requirements are reached to form the corresponding fixed pile foundation. During the piling process, the guiding effect of the guide sleeve is used to ensure the verticality and positional accuracy of the steel pipe piles and reduce the construction error of the pile foundation.

[0092] In step S3: After pile driving is completed, the gap between the steel pipe pile and the guide sleeve 1 is grouted for fixation. The grouting material used should have good fluidity, strength, and durability, capable of filling the gap between the pile foundation and the guide sleeve, forming a solidified body, tightly connecting the two together, and enhancing the integrity and load-bearing capacity of the structure. The grouting operation should be carried out strictly in accordance with the process requirements to ensure that the grouting is dense and free of voids.

[0093] In step S4: The prefabricated fan duct frame is slowly and accurately inserted into the guide sleeve 2 of the duct frame along the guide plate. During the insertion process, the verticality and center position of the duct frame must be ensured, and damage to the guide sleeve and other components caused by collisions should be avoided as much as possible. At the same time, the guiding effect of the guide section 5 is used to ensure that the duct frame can be smoothly positioned, thereby improving installation efficiency and accuracy.

[0094] In step S5: Grouting is performed on the connection between the jacket and the jacket guide sleeve 2. The grouting material and process are similar to those used for steel pipe pile grouting to ensure a firm connection between the jacket and the guide sleeve. This allows the wind turbine jacket and the pile group system frame to form a tight, integrated pile group structure, which together bears various loads during wind turbine operation and ensures the stable operation of the wind turbine.

[0095] Specifically, the offshore wind turbine pile structure suitable for complex geological conditions provided in this application embodiment can achieve the same technical effect by performing the above-described usage method, which will not be repeated here.

[0096] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0098] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0099] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0100] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A pile structure for offshore wind turbines suitable for complex geological conditions, characterized in that, The system includes a guide assembly consisting of a steel pipe pile guide sleeve, a guide sleeve for the guide frame, and a connecting ring plate, and a pile group system frame integrating multiple guide assemblies through a connecting frame, wherein: Both the guide sleeve for the steel pipe pile and the guide sleeve for the guide frame are equipped with guide sections, shear keys, and reserved grouting system components. The connecting ring plate is disposed around the periphery of the guide sleeve of the steel pipe pile and the guide sleeve of the guide frame; The connecting frame connects multiple guide sleeves of the guide frame by multiple frame chords.

2. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 1, characterized in that, Multiple guide sleeves for steel pipe piles can be provided in the guide assembly, but at least two are required; Multiple steel pipe pile guide sleeves are arranged around the periphery of the guide sleeve of the guide frame.

3. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 2, characterized in that, The shear keys include horizontal shear keys and vertical shear keys.

4. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 3, characterized in that, The horizontal shear keys are arranged in an axial array along the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame; The vertical shear keys are arranged in a circumferential array along the guide sleeve of the steel pipe pile or the guide sleeve of the jacket.

5. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 4, characterized in that, The vertical shear key includes at least an upper shear segment and a lower shear segment, and the horizontal shear key is linearly arrayed on the inner wall of the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame.

6. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 5, characterized in that, The grouting system components include a waterproof diaphragm and a grouting packer; The waterproof diaphragm includes a first waterproof diaphragm disposed at the guide section of the guide sleeve of the steel pipe pile or the guide section of the guide sleeve of the guide frame and a second waterproof diaphragm disposed at the bottom of the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame. The bottom end of the guide sleeve of the steel pipe pile or the guide sleeve of the guide frame is also provided with the grouting sealer.

7. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 6, characterized in that, The connecting ring plate includes at least an upper yoke plate and a lower yoke plate, which are symmetrically arranged on the outer surfaces of the steel pipe pile guide sleeve and the guide sleeve of the guide frame.

8. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 7, characterized in that, The frame chords include an upper frame chord and a lower frame chord, and a frame A-frame brace is also provided between the upper frame chord and the lower frame chord.

9. The offshore wind turbine pile structure suitable for complex geological conditions according to claim 8, characterized in that, The pile group structure also includes an anti-sinking plate and a connecting plate, wherein the anti-sinking plate is located below the lower chord of the frame; The connecting plate is provided between any of the steel pipe pile guide sleeves and the guide sleeve of the guide frame.

10. An installation method for offshore wind turbine pile structures suitable for complex geological conditions, based on any one of claims 1-9, characterized in that, include: Step S1: Transport the pile group system frame to the site and hoist it to the seabed positioning point using the installation lifting points; Step S2: Drive the corresponding steel pipe pile into the guide sleeve of the steel pipe pile to the predetermined depth; Step S3: Grouting and curing are performed on the gap between the steel pipe pile and the guide sleeve of the steel pipe pile; Step S4: Insert the wind turbine jacket into the pile group system frame along the guide section of the jacket guide sleeve; Step S5: Grouting and curing are performed on the gap between the guide frame and the guide sleeve of the guide frame.

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