Positioning anti-scouring device for offshore wind turbine inclined pile group foundation and construction method

Abstract

The application relates to the technical field of ocean wind power, and particularly discloses a positioning and anti-scouring device for an inclined group-pile foundation of an ocean wind turbine and a construction method, wherein the positioning and anti-scouring device comprises a device body and an auxiliary mounting body; the device body comprises an upper supporting plate, a lower supporting plate and a side connecting plate; the middle parts of the upper supporting plate and the lower supporting plate are connected by a supporting wall; a plurality of positioning holes are arranged on the supporting wall and extend into the upper supporting plate and the lower supporting plate in the circumferential direction of the supporting wall; a ventilation hole is arranged on the upper supporting plate; a water injection hole is arranged on the lower supporting plate; the auxiliary mounting body comprises a mounting frame and a mounting base; and the height of the mounting frame is higher than the depth of water. The scheme can realize accurate positioning of the installation and construction of the inclined group-pile foundation, and through the integrated design of the modularization and the scouring protection, synchronous construction and protection are realized, and the scheme has remarkable economic and social benefits.

Description

Technical Field

[0001] This invention relates to the field of marine wind power technology, specifically providing a positioning and anti-scour device and construction method for inclined pile foundations of marine wind turbines. Background Technology

[0002] As offshore wind power develops towards deeper and larger capacities, the requirements for pile foundation performance are becoming increasingly stringent. Inclined pile foundations are gradually becoming an important form of offshore wind turbine foundation due to their excellent resistance to horizontal loads and economic advantages.

[0003] However, in complex marine dynamic environments, the construction and operation of such foundations face severe challenges, mainly in the following aspects: 1. The spatial positioning accuracy of inclined pile groups is difficult to control, and existing vertical pile positioning technology cannot meet its positioning requirements, which will seriously affect the collaborative force-bearing performance of the pile groups; 2. The inclined arrangement changes the interaction mechanism of pile-soil-water dynamics, and a unique "three-dimensional horseshoe vortex system" will be formed under the coupling effect of waves and currents. On-site monitoring shows that the maximum scour depth around the inclined pile group foundation is 60-80% higher than that of vertical piles; 3. Conventional scour protection measures are prone to slippage failure on the surface of the inclined piles, resulting in high annual maintenance costs.

[0004] Existing technologies face three major bottlenecks in addressing the aforementioned issues: 1. Existing positioning systems lack the ability to control the spatial configuration of inclined pile groups, making precise positioning and installation of the pile groups difficult; 2. Existing protective structures cannot effectively cope with the complex three-dimensional flow around the inclined pile groups, resulting in insufficient protection efficiency; 3. In existing methods, the construction and protection systems are separated, leading to a significant increase in engineering costs; these problems are particularly prominent under extreme conditions such as typhoons.

[0005] In summary, to address the aforementioned issues, this paper proposes an integrated positioning, installation, and scour prevention device and its construction method for inclined pile foundations of offshore wind turbines. This device enables centimeter-level positioning during the installation of inclined pile foundations, allowing construction and protection to proceed simultaneously. This is a problem that urgently needs to be solved. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a positioning and scour prevention device and construction method for inclined pile foundations of offshore wind turbines. This device is used for the positioning and installation of inclined piles and for preventing scour during wind turbine operation. It can effectively solve the engineering challenges of inclined pile foundations in deep-sea environments and provide key technical support for the safe and efficient construction of next-generation large-capacity offshore wind turbines.

[0007] This invention provides a positioning and scour prevention device for inclined pile foundations of offshore wind turbines, comprising a device body and an auxiliary mounting body, the auxiliary mounting body being detachably mounted on the circumferential outer side of the device body; the device body includes an upper support plate, a lower support plate, and a side connecting plate connecting the upper and lower support plates, the upper and lower support plates being planar plate structures, and the side connecting plate being a curved plate structure, the outer diameter of the side connecting plate gradually increasing from the upper support plate to the lower support plate; the upper and lower support plates are respectively provided with a central section. The device has an upper through hole and a lower through hole, which are connected by a support wall. The support wall is a conical wall structure with an inner diameter that gradually increases from top to bottom. Multiple positioning holes are provided on the support wall with the central axis of the device body as the reference and facing away from the central axis. The multiple positioning holes are provided along the circumference of the support wall and extend into the upper and lower support plates. The positioning holes are inclined holes that are inclined from top to bottom towards the side away from the central axis. A vent hole is provided on the upper support plate, which is staggered from the positioning holes. A water injection hole is provided on the lower support plate.

[0008] Furthermore, an upper reinforcing ring is provided at the connection between the upper support plate and the side connecting plate, and a lower reinforcing ring is provided at the connection between the lower support plate and the side connecting plate. A middle reinforcing ring is provided between the upper and lower reinforcing rings on the side connecting plate; that is, the upper reinforcing ring is located at the top of the side connecting plate, the lower reinforcing ring is located at the bottom of the side connecting plate, and the middle reinforcing ring is located in the middle of the side connecting plate.

[0009] Furthermore, the auxiliary mounting body includes a mounting frame and a mounting base extending outward from the bottom end of the mounting frame; the inner diameter of the mounting frame is larger than the outer diameter of the bottom end of the lower support plate, and the height of the mounting frame is higher than the depth of the water.

[0010] Furthermore, the water injection holes and positioning holes are staggered, and the water injection holes include multiple groups of water injection holes arranged circumferentially; each group of water injection holes includes at least two water injection holes of different sizes, and the water injection holes in each group of water injection holes are arranged on the same straight line.

[0011] Furthermore, the upper support plate, lower support plate, side connecting plate and support wall are hollow structures.

[0012] Furthermore, the side connecting plate is recessed inward toward the central axis.

[0013] Furthermore, the upper reinforcing ring, the middle reinforcing ring, and the lower reinforcing ring are formed by an inner core and an anti-corrosion coating covering the inner core.

[0014] Furthermore, the auxiliary mounting body is made of stainless steel; the width of the mounting base is 0.4m-0.6m.

[0015] Furthermore, the overall height of the device body is 1-3m; the ventilation holes and water injection holes are fabricated through pre-reserved methods.

[0016] A construction method for a positioning and scour prevention device for inclined pile foundations of offshore wind turbines, comprising the following steps:

[0017] S1: Based on the selected location of the offshore wind turbine, auxiliary installation bodies are arranged using lifting equipment to ensure that the bottom surface of the installation frame and the installation base are in close contact with the seabed, and the top surface of the installation frame is higher than the sea level.

[0018] S2: Place the device body into the auxiliary installation device, and form a ventilation structure inside the device body through the water injection hole and the air vent, so that seawater can enter the interior of the device body through the water injection hole. As the seawater inside the device body gradually fills in, the device body gradually sinks under its own weight until the bottom support plate of the device body is completely in contact with the seabed.

[0019] S3: Install the inclined piles of the marine wind turbine in the positioning hole so that the inclined piles pass through the positioning hole to achieve positioning and installation;

[0020] S4: After all the inclined piles are installed, concrete mortar is injected through the vent hole using the grouting equipment; during the grouting process, the seawater inside the device body is gradually discharged, and as the concrete mortar is injected and filled, the positioning hole and the inclined pile are tightly fitted together.

[0021] S5: After the inclined foundation piles are installed, the auxiliary installation body is removed using a lifting device;

[0022] S6: Construct a wind turbine platform and wind turbine tower on the top surface of the inclined foundation piles.

[0023] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0024] 1. The positioning and anti-scouring device in this solution can meet the spatial positioning accuracy control of the inclined pile group, meet its positioning requirements, and ensure the coordinated force-bearing performance of the inclined pile group.

[0025] 2. The positioning anti-scour device in this solution can improve the anti-scour capability, avoid the slippage failure of the tilted pile group, and greatly reduce maintenance costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the positioning and anti-scour device provided in an embodiment of the present invention (in the state where the inclined foundation pile, wind turbine platform, and wind turbine tower have been installed).

[0027] Figure 2 This is a schematic diagram of the structure of the device body in the positioning and anti-erosion device provided according to an embodiment of the present invention. Figure 1 (The inclined foundation piles, wind turbine platform, and wind turbine tower are already installed).

[0028] Figure 3 yes Figure 2 A sectional view;

[0029] Figure 4 This is a schematic diagram of the structure of the device body in the positioning and anti-scour device provided according to an embodiment of the present invention (in the state where the inclined foundation pile has been installed).

[0030] Figure 5 This is a schematic diagram of the structure of the device body in the positioning and anti-erosion device provided according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the device body in the positioning and anti-erosion device provided according to an embodiment of the present invention.

[0032] The reference numerals in the attached drawings include: device body 1, auxiliary mounting body 2, upper support plate 3, lower support plate 4, side connecting plate 5, support wall 6, positioning hole 7, ventilation hole 8, upper reinforcing ring 9, middle reinforcing ring 10, lower reinforcing ring 11, mounting frame 12, mounting base 13, inclined foundation pile 14, wind turbine platform 15, wind turbine tower 16, water injection hole 17. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with the appendix. Figure 1-6 The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and do not constitute a limitation thereof.

[0034] A positioning and scour prevention device for inclined pile foundations of offshore wind turbines includes a device body 1 and an auxiliary mounting body 2. The auxiliary mounting body 2 is detachably covered on the circumferential outer side of the device body 1. The auxiliary mounting body 2 includes a mounting frame 12 and a mounting base 13 extending outward from the bottom end of the mounting frame 12. The inner diameter of the mounting frame 12 is larger than the outer diameter of the bottom end of the lower support plate 4. The height of the mounting frame 12 is higher than the water depth, ensuring that the top surface of the mounting frame 12 is slightly higher than the sea level when the mounting base 13 is tightly attached to the seabed. The auxiliary mounting body 2 is made of stainless steel with an anti-corrosion coating on the outer surface to prevent corrosion by seawater. The width of the mounting base 13 is 0.4m-0.6m. In this embodiment, the width of the mounting base 13 is 0.5m, which is used to prevent the auxiliary mounting body 2 from inserting into the seabed when it is placed on the seabed.

[0035] The device body 1 includes an upper support plate 3, a lower support plate 4, and a side connecting plate 5 connecting the upper support plate 3 and the lower support plate 4. The upper support plate 3 and the lower support plate 4 are flat plate structures, and the side connecting plate 5 is a curved plate structure. The side connecting plate 5 is recessed inward toward the central axis L of the device body 1. The upper support plate 3, the lower support plate 4, the side connecting plate 5 and the support wall 6 are hollow structures. The device body 1 as a whole is a flexible structure.

[0036] The upper support plate 3 and the lower support plate 4 are respectively provided with an upper through hole and a lower through hole in the middle part. The upper through hole and the lower through hole are connected by a support wall 6. The support wall 6 is a conical wall structure with an inner diameter that gradually increases from top to bottom. Multiple positioning holes 7 are provided on the support wall 6 with the central axis L of the device body 1 as the reference and facing away from the central axis L. The multiple positioning holes 7 are opened along the circumference of the support wall 6 and extend into the upper support plate 3 and the lower support plate 4. The positioning holes 7 are inclined holes that are inclined from top to bottom and facing away from the central axis. The upper support plate 3 is provided with a vent hole 8. The vent hole 8 is staggered from the positioning holes 7. In this embodiment, a total of six positioning holes 7 are evenly arranged. The six positioning holes 7 are arranged in a plum blossom pattern. The inner diameter of the positioning holes 7 is slightly larger than the outer diameter of the inclined pile 14.

[0037] The outer diameter of the side connecting plate 5 gradually increases from the upper support plate 3 to the lower support plate 4. An upper reinforcing ring 9 is provided at the connection between the upper support plate 3 and the side connecting plate 5, and a lower reinforcing ring 11 is provided at the connection between the lower support plate 4 and the side connecting plate 5. A middle reinforcing ring 10 is provided between the upper reinforcing ring 9 and the lower reinforcing ring 11 on the side connecting plate 5.

[0038] The upper reinforcing ring 9, the middle reinforcing ring 10, and the lower reinforcing ring 11 have a certain thickness. The upper reinforcing ring 9, the middle reinforcing ring 10, and the lower reinforcing ring 11 are formed by a high-strength inner core and an anti-corrosion coating covering the high-strength inner core. The upper reinforcing ring 9 is located at the top of the side connecting plate 5, the lower reinforcing ring 11 is located at the bottom of the side connecting plate 5, and the middle reinforcing ring 10 is located in the middle of the side connecting plate 5. The upper reinforcing ring 9, the middle reinforcing ring 10, and the lower reinforcing ring 11 are tightly fixed and attached to the side connecting plate 5.

[0039] A water injection hole 17 is provided on the lower support plate 4. The water injection hole 17 is staggered from the positioning hole 7. The water injection hole 17 includes multiple groups of water injection holes arranged circumferentially. Each group of water injection holes includes at least two water injection holes 17 of different sizes. The water injection holes 17 in each group of water injection holes are arranged on the same straight line. In this embodiment, each group of water injection holes includes two water injection holes 17 that gradually increase in size from the inside to the outside. The overall height of the device body 1 is 1-3m, which is set according to the actual working conditions. The vent hole 8 and the water injection hole 17 are made by pre-reservation.

[0040] A construction method for a positioning and scour prevention device for inclined pile foundations of offshore wind turbines, comprising the following steps:

[0041] S1: Based on the location of the offshore wind turbine, the auxiliary installation body 2 is arranged by lifting equipment so that the bottom surface of the installation frame 12 and the installation base 13 are closely attached to the seabed, and the top surface of the installation frame 12 is slightly higher than the sea level.

[0042] S2: Place the device body 1 into the auxiliary installation device. A ventilation structure is formed inside the device body 1 through the water injection hole 17 and the air vent 8, so that seawater can enter the interior of the device body 1 through the water injection hole 17. As the seawater inside the device body 1 gradually fills, the device body 1 gradually sinks under its own weight until the lower support plate 4 on the bottom surface of the device body 1 is in complete contact with the seabed.

[0043] S3: Install the inclined pile 14 of the marine wind turbine in the positioning hole 7, so that the inclined pile 14 passes through the positioning hole 7 to achieve positioning and installation.

[0044] S4: After all the inclined piles 14 are installed, concrete mortar is injected through the vent hole 8 using the grouting equipment. During the grouting process, the seawater inside the device body 1 is gradually discharged. As the concrete mortar is injected and filled, the positioning hole 7 fits tightly with the inclined pile 14, making full use of the flexible characteristics of the device body 1. The outer surface of the device body 1 is protected from deformation by the arrangement of the upper reinforcing ring 9, the middle reinforcing ring 10 and the lower reinforcing ring 11.

[0045] S5: After the inclined foundation pile 14 is installed, the auxiliary installation body 2 is removed by a lifting device. This process allows the auxiliary installation body 2 to be reused repeatedly.

[0046] S6: Construct a wind turbine platform 15 and a wind turbine tower 16 on the top surface of the inclined foundation pile 14 to gradually complete the construction of the offshore wind turbine.

[0047] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A positioning and scour prevention device for inclined pile foundations of offshore wind turbines, characterized in that, The device includes a main body and an auxiliary mounting body, which is detachably mounted on the outer periphery of the main body. The main body includes an upper support plate, a lower support plate, and a side connecting plate connecting the upper and lower support plates. The upper and lower support plates are flat plate structures, while the side connecting plate is a curved plate structure. The outer diameter of the side connecting plate gradually increases from the upper support plate to the lower support plate. The upper and lower support plates are respectively provided with an upper through hole and a lower through hole in their middle sections, which are connected by a support wall. The support wall is a conical wall structure with an inner diameter that gradually increases from top to bottom. Multiple positioning holes are provided on the support wall with the central axis of the main body as a reference, facing away from the central axis. The multiple positioning holes are provided along the circumference of the support wall and extend into the upper and lower support plates. The positioning holes are inclined holes that slope from top to bottom towards the side away from the central axis. A vent hole is provided on the upper support plate, which is staggered from the positioning holes. A water injection hole is provided on the lower support plate.

2. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 1, characterized in that, An upper reinforcing ring is provided at the connection between the upper support plate and the side connecting plate, and a lower reinforcing ring is provided at the connection between the lower support plate and the side connecting plate. A middle reinforcing ring is provided between the upper and lower reinforcing rings on the side connecting plate; that is, the upper reinforcing ring is located at the top of the side connecting plate, the lower reinforcing ring is located at the bottom of the side connecting plate, and the middle reinforcing ring is located in the middle of the side connecting plate.

3. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 2, characterized in that, The auxiliary mounting body includes a mounting frame and a mounting base extending outward from the bottom of the mounting frame; the inner diameter of the mounting frame is larger than the outer diameter of the bottom of the lower support plate, and the height of the mounting frame is higher than the depth of the water.

4. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 3, characterized in that, The water injection holes are staggered from the positioning holes. The water injection holes include multiple groups of water injection holes arranged circumferentially. Each group of water injection holes includes at least two water injection holes of different sizes, and the water injection holes in each group of water injection holes are arranged on the same straight line.

5. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 4, characterized in that, The upper support plate, lower support plate, side connecting plate and support wall are hollow structures.

6. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 5, characterized in that, The side connecting plate is recessed inward toward the central axis.

7. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 6, characterized in that, The upper reinforcing ring, middle reinforcing ring, and lower reinforcing ring are formed by an inner core and an anti-corrosion coating covering the inner core.

8. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 7, characterized in that, The auxiliary mounting body is made of stainless steel; the width of the mounting base is 0.4m-0.6m.

9. The positioning and scour prevention device for inclined pile foundations of offshore wind turbines according to claim 8, characterized in that, The overall height of the device body is 1-3m; the ventilation holes and water injection holes are fabricated by pre-reservation.

10. A construction method for a positioning and scour prevention device for inclined pile foundations of offshore wind turbines, comprising using the positioning and scour prevention device of claim 5, characterized in that... Includes the following steps: S1: Based on the selected location of the offshore wind turbine, auxiliary installation bodies are arranged using lifting equipment to ensure that the bottom surface of the installation frame and the installation base are in close contact with the seabed, and the top surface of the installation frame is higher than the sea level. S2: Place the device body into the auxiliary installation device, and form a ventilation structure inside the device body through the water injection hole and the air vent, so that seawater can enter the interior of the device body through the water injection hole. As the seawater inside the device body gradually fills in, the device body gradually sinks under its own weight until the bottom support plate of the device body is completely in contact with the seabed. S3: Install the inclined piles of the marine wind turbine in the positioning hole so that the inclined piles pass through the positioning hole to achieve positioning and installation; S4: After all the inclined piles are installed, concrete mortar is injected through the vent holes using grouting equipment; during the grouting process, the seawater inside the device is gradually discharged, and as the concrete mortar is injected and filled, the positioning hole and the inclined pile are tightly fitted together. S5: After the inclined foundation piles are installed, the auxiliary installation body is removed using a lifting device; S6: Construct a wind turbine platform and wind turbine tower on the top surface of the inclined foundation piles.

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