Positioning anti-scour device for inclined pile group foundation of ocean wind turbine and construction method

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and specifically provides a positioning and anti-scouring device and construction method for the inclined group pile foundation of an offshore wind turbine. Background Art

[0002] With the development of offshore wind power towards the deep sea and large capacity, the requirements for the performance of group pile foundations are getting higher and higher. Due to its excellent horizontal load resistance ability and economic advantages, the inclined group pile foundation is gradually becoming an important form of offshore wind turbine foundation. At present, the inclined group pile foundation has been widely used in offshore wind power projects in areas such as Pingtan Sea Area and Ba Ria - Vung Tau in Thailand.

[0003] However, in a complex marine dynamic environment, the construction and operation and maintenance of this type of foundation face severe challenges, which are mainly manifested in the following aspects: 1. It is difficult to control the spatial positioning accuracy of inclined group piles, and the existing vertical pile positioning technology cannot meet its positioning requirements, which will seriously affect the cooperative stress performance of the group piles; 2. The inclined layout changes the interaction mechanism of pile - soil - water dynamics, and a unique "three-dimensional horseshoe vortex system" will be formed under the coupled action of waves and currents. Field monitoring shows that the maximum scour depth around the inclined group pile foundation is 60 - 80% higher than that of vertical piles; 3. Conventional scour protection measures are prone to slip failure on the surface of inclined piles, and the annual maintenance cost is relatively high.

[0004] When the existing technologies deal with the above problems, there are the following three major bottlenecks: 1. The existing positioning system lacks the ability to adjust the spatial configuration of the inclined group piles, making it difficult to accurately position and install the group piles; 2. The existing protection structure cannot effectively cope with the complex three-dimensional flow around the inclined group piles, and the protection efficiency is insufficient; 3. In the existing methods, the construction and protection systems are separated, resulting in a significant increase in project costs; especially in extreme working conditions such as typhoons, the above problems are more prominent.

[0005] In summary, in order to solve the above problems, a positioning and installation, anti-scouring integrated device for the inclined group pile foundation of an offshore wind turbine and its construction method are proposed to achieve centimeter-level positioning of the installation construction of the inclined group pile foundation and synchronize construction and protection, which is an urgent problem to be solved at present. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a positioning and anti-scouring device and construction method for the inclined group pile foundation of an offshore wind turbine, which is used for the positioning and installation of inclined group piles and the foundation anti-scouring device during the operation of the wind turbine, can effectively solve the engineering problems of the inclined group pile foundation in the deep sea environment, and provides key technical support for the safe and efficient construction of the next generation of large-capacity offshore wind turbines.

[0007] The present invention provides a positioning and anti-scouring device for an inclined pile group foundation of an offshore wind turbine, comprising a device body and an auxiliary mounting body, wherein a detachable cover of the auxiliary mounting body is arranged on the circumferential outer side of the device body; the device body comprises an upper support plate, a lower support plate and a side connecting plate connected between the upper support plate and the lower support plate, wherein the upper support plate and the lower support plate are flat plate structures, and the side connecting plate is a curved plate structure, and the outer diameter of the side connecting plate gradually increases from the upper support plate to the lower support plate; the middle parts of the upper support plate and the lower support plate are respectively provided with An upper through hole and a lower through hole are connected by a supporting wall, and the supporting wall is a conical wall structure with an inner diameter gradually increasing from top to bottom; a plurality of positioning holes are opened on the supporting wall toward a side away from the central axis with the central axis of the device body as a reference, and the plurality of positioning holes are opened along the circumference of the supporting wall and extend into the upper supporting plate and the lower supporting plate, and the positioning holes are inclined holes inclined from top to bottom toward a side away from the central axis; a vent hole is opened on the upper supporting plate, and the vent hole and the positioning hole are staggered, and a water injection hole is opened on the lower supporting plate.

[0008] Furthermore, an upper reinforcement ring is provided at the connection between the upper support plate and the side connecting plate, a lower reinforcement ring is provided at the connection between the lower support plate and the side connecting plate, and a middle reinforcement ring located on the side connecting plate is provided between the upper reinforcement ring and the lower reinforcement ring; that is, the upper reinforcement ring is located at the top end of the side connecting plate, the lower reinforcement ring is located at the bottom end of the side connecting plate, and the middle reinforcement 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 the positioning holes are staggered, and the water injection holes include multiple groups of water injection holes arranged along the circumferential direction; 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, a hollow structure is formed between the upper support plate, the lower support plate, the side connecting plate and the support wall.

[0012] Furthermore, the side connecting plate is concave toward the central axis as a whole.

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

[0014] Furthermore, the auxiliary installation body is made of stainless steel; the width of the installation 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 made in a reserved manner.

[0016] A construction method of a positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine, which uses the above-mentioned positioning and anti-scouring device for construction, includes the following steps:

[0017] S1: According to the selected location of the offshore wind turbine, use a lifting device to arrange the auxiliary installation body, so that the bottom end 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 ventilation hole, so that seawater can enter the inside of the device body from the water injection hole. As the seawater inside the device body gradually fills, the device body gradually sinks under its own weight until the lower support plate at the bottom of the device body is completely in contact with the seabed;

[0019] S3: Install the inclined foundation piles of the offshore wind turbine in the positioning holes, so that the inclined foundation piles pass through the positioning holes for positioning installation;

[0020] S4: After all the inclined foundation piles are installed, inject concrete mortar from the ventilation hole through the grouting equipment; during the grouting process, the seawater inside the device body is gradually discharged, and as the concrete mortar is grouted and filled, the positioning holes and the inclined foundation piles are closely fitted;

[0021] S5: After the inclined foundation piles are installed, remove the auxiliary installation body through the lifting device;

[0022] S6: Build a wind turbine platform and a 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 group piles, meet its positioning requirements, and ensure the cooperative stress performance of the inclined group piles;

[0025] 2. The positioning and anti-scouring device in this solution can improve the anti-scouring ability, avoid the phenomenon of slip failure of the inclined group piles, and greatly reduce the maintenance cost.

[0026] 3. The positioning and anti-scouring device in this solution can separate the construction and protection systems, reduce the project cost, and can cope with various extreme working conditions such as typhoons. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the overall structure of the positioning and anti-scouring device provided by the embodiment of the present invention (the state where the inclined foundation piles, the wind turbine platform, and the wind turbine tower are installed);

[0028] Figure 2It is a schematic structural view of the device body in the positioning and anti-erosion device provided by an embodiment of the present invention Figure 1 (State where the inclined pile, the wind turbine platform, and the wind turbine tower have been installed);

[0029] Figure 3 is Figure 2 a sectional view;

[0030] Figure 4 It is a schematic structural view of the device body in the positioning and anti-erosion device provided by an embodiment of the present invention (state where the inclined pile has been installed);

[0031] Figure 5 It is a schematic structural view of the device body in the positioning and anti-erosion device provided by an embodiment of the present invention;

[0032] Figure 6 It is a schematic structural view of the device body in the positioning and anti-erosion device provided by an embodiment of the present invention.

[0033] The reference numerals therein include: device body 1, auxiliary installation body 2, upper support plate 3, lower support plate 4, side connection plate 5, support wall 6, positioning hole 7, ventilation hole 8, upper reinforcement ring 9, middle reinforcement ring 10, lower reinforcement ring 11, installation frame 12, installation base 13, inclined pile 14, wind turbine platform 15, wind turbine tower 16, water injection hole 17. Specific embodiments

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the following combines the attached Figures 1-6 drawings and specific embodiments to further elaborate on the present invention in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation to the present invention.

[0035] A positioning and anti-erosion device for the inclined group pile foundation of an offshore wind turbine includes a device body 1 and an auxiliary installation body 2. The auxiliary installation body 2 is detachably covered on the circumferential outer side of the device body 1. The auxiliary installation body 2 includes an installation frame 12 and an installation base 13 extending outward from the bottom end of the installation frame 12; the inner diameter of the installation frame 12 is larger than the outer diameter of the bottom end of the lower support plate 4, and the height of the installation frame 12 is higher than the water depth, which can ensure that the top surface of the installation frame 12 is slightly higher than the sea level when the installation base 13 is in close contact with the seabed. The auxiliary installation body 2 is made of stainless steel material and has an anti-corrosion coating on the outer surface to avoid corrosion by seawater. The width of the installation base 13 is 0.4 m - 0.6 m. In this embodiment, the width of the installation base 13 is 0.5 m, which is used to prevent the auxiliary installation body 2 from being inserted into the seabed when it is placed on the seabed.

[0036] The device body 1 includes an upper support plate 3, a lower support plate 4 and a side connecting plate 5 connected between 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, the side connecting plate 5 is a curved plate structure, and the side connecting plate 5 is concave toward the central axis L of the device body 1 as a whole. There is a hollow structure between the upper support plate 3, the lower support plate 4, the side connecting plate 5 and the support wall 6, and the device body 1 as a whole is a flexible structure.

[0037] An upper through hole and a lower through hole are respectively provided in the middle of the upper support plate 3 and the lower support plate 4, and 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 gradually increasing from top to bottom. A plurality of positioning holes 7 are provided on the support wall 6 toward the side away from the central axis L with the central axis L of the device body 1 as a reference. The plurality of positioning holes 7 are provided 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 inclined from top to bottom toward the side away from the central axis. A ventilation hole 8 is provided on the upper support plate 3, and the ventilation hole 8 is staggered with the positioning hole 7. In the present embodiment, a total of six uniformly arranged positioning holes 7 are included, and the six positioning holes 7 are arranged in a plum blossom shape. The inner diameter of the positioning hole 7 is slightly larger than the outer diameter of the inclined foundation pile 14.

[0038] 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 reinforcement ring 9 is provided at the connection between the upper support plate 3 and the side connecting plate 5, a lower reinforcement ring 11 is provided at the connection between the lower support plate 4 and the side connecting plate 5, and a middle reinforcement ring 10 located on the side connecting plate 5 is provided between the upper reinforcement ring 9 and the lower reinforcement ring 11.

[0039] The upper reinforcement ring 9, the middle reinforcement ring 10 and the lower reinforcement ring 11 have a certain thickness, and are formed by a high-strength inner core and a corrosion-resistant coating covering the high-strength inner core. The upper reinforcement ring 9 is located at the top end of the side connecting plate 5, the lower reinforcement ring 11 is located at the bottom end of the side connecting plate 5, and the middle reinforcement ring 10 is located in the middle of the side connecting plate 5. The upper reinforcement ring 9, the middle reinforcement ring 10 and the lower reinforcement ring 11 are tightly fixed to the side connecting plate 5.

[0040] The lower support plate 4 is provided with water injection holes 17, which are staggered with the positioning holes 7. The water injection holes 17 include a plurality of water injection hole groups arranged along the circumferential direction, each water injection hole group includes at least two water injection holes 17 of different sizes, and the water injection holes 17 in each water injection hole group are arranged on the same straight line. In this embodiment, each water injection hole group 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 specifically according to the actual working conditions. The vent holes 8 and the water injection holes 17 are made in a reserved manner.

[0041] A construction method for a positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine, using the above positioning and anti-scouring device for construction, includes the following steps:

[0042] S1: According to the selected location of the offshore wind turbine, use a lifting device to arrange the auxiliary installation body 2 so that the bottom end surface of the installation frame 12 and the installation base 13 are in close contact with the seabed, and the top surface of the installation frame 12 is slightly higher than the sea level.

[0043] S2: Place the device body 1 into the auxiliary installation device, and form a ventilation structure inside the device body 1 through the water injection hole 17 and the ventilation hole 8, so that seawater can enter the inside of the device body 1 from 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 at the bottom of the device body 1 is completely in contact with the seabed.

[0044] S3: Install the inclined foundation pile 14 of the offshore wind turbine in the positioning hole 7 so that the inclined foundation pile 14 passes through the positioning hole 7 for positioning and installation.

[0045] S4: After all the inclined foundation piles 14 are installed, inject concrete mortar from the ventilation hole 8 through a grouting device; during the grouting process, the seawater inside the device body 1 is gradually discharged. As the concrete mortar is grouted and filled, the positioning hole 7 and the inclined foundation pile 14 are in close contact, making full use of the flexible characteristics of the device body 1. And due to the arrangement of the upper reinforcement ring 9, the middle reinforcement ring 10 and the lower reinforcement ring 11 on the outer surface of the device body 1, the deformation of the outer surface is prevented.

[0046] S5: After the inclined foundation piles 14 are installed, remove the auxiliary installation body 2 through a lifting device, and this process can realize the repeated cyclic use of the auxiliary installation body 2.

[0047] S6: Build the fan platform 15 and the fan tower barrel 16 on the top surface of the inclined foundation pile 14, and gradually complete the construction work of the offshore wind turbine.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill 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 anti-scouring device for the inclined group pile foundation of an offshore wind turbine, characterized in that, The utility model comprises a device body and an auxiliary mounting body, and a detachable cover of the auxiliary mounting body is arranged on the circumferential outer side of the device body; the device body comprises an upper support plate, a lower support plate and a side connecting plate connected between the upper support plate and the lower support plate, the upper support plate and the lower support plate are flat plate structures, and the side connecting plate is a curved plate structure, and the outer diameter of the side connecting plate gradually increases from the upper support plate to the lower support plate; an upper through hole and a lower through hole are respectively opened in the middle of the upper support plate and the lower support plate, and the upper through hole and the lower through hole are connected by a supporting wall, and the supporting wall is a conical wall structure with an inner diameter gradually increasing from top to bottom; a plurality of positioning holes are opened on the supporting wall toward a side away from the central axis with the central axis of the device body as a reference, and the plurality of positioning holes are opened along the circumference of the supporting wall and extend into the upper support plate and the lower support plate, and the positioning holes are inclined holes inclined from top to bottom toward a side away from the central axis; a vent hole is opened on the upper support plate, and the vent hole and the positioning hole are staggered, and a water injection hole is opened on the lower support plate.

2. The positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine according to claim 1, characterized in that, An upper reinforcement ring is provided at the connection between the upper support plate and the side connecting plate, a lower reinforcement ring is provided at the connection between the lower support plate and the side connecting plate, and a middle reinforcement ring located on the side connecting plate is provided between the upper reinforcement ring and the lower reinforcement ring; that is, the upper reinforcement ring is located at the top end of the side connecting plate, the lower reinforcement ring is located at the bottom end of the side connecting plate, and the middle reinforcement ring is located in the middle of the side connecting plate.

3. The positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine according to claim 2, characterized in that, The auxiliary mounting body comprises 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 water.

4. The positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine according to claim 3, characterized in that, The water injection holes are staggered with the positioning holes, and the water injection holes include multiple groups of water injection holes arranged along the circumferential direction; 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 anti-erosion device for the inclined group pile foundation of an offshore wind turbine according to claim 4, characterized in that, A hollow structure is formed between the upper support plate, the lower support plate, the side connecting plate and the support wall.

6. The positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine according to claim 5, characterized in that, The side connecting plate is concave toward the central axis as a whole.

7. The positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine according to claim 6, characterized in that, The upper reinforcement ring, the middle reinforcement ring and the lower reinforcement ring are formed by an inner core and an anti-corrosion coating covering the inner core.

8. The positioning and anti-scouring device for the inclined group pile foundation of an offshore wind turbine according to claim 7, characterized in that, The auxiliary installation body is made of stainless steel; the width of the installation base is 0.4m-0.6m.

9. The positioning and scour prevention device for the inclined group pile foundation of an offshore wind turbine 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 made in a reserved manner.

10. A construction method of a positioning and anti-scouring device for an inclined group pile foundation of an offshore wind turbine, which uses the positioning and anti-scouring device in claim 5 for construction, and is characterized in that, The steps include: S1: According to the site selection of the offshore wind turbine, the auxiliary installation body is arranged by lifting equipment so that the bottom end surface of the installation frame and the installation base are closely attached to the seabed, and the top surface of the installation frame is higher than the sea level; S2: placing the device body into the auxiliary installation device, forming a ventilation structure inside the device body through the water injection hole and the vent hole, so that seawater can enter the inside of the device body from the water injection hole. As the seawater inside the device body is gradually filled, the device body gradually sinks under the action of its own weight until the lower support plate on the bottom surface of the device body is completely in contact with the seabed; S3: Install the offshore wind turbine inclined foundation pile in the positioning hole so that the inclined foundation pile passes through the positioning hole to achieve positioning installation; S4: After all the inclined foundation piles are installed, inject the concrete mortar through the grouting equipment from the ventilation hole; during the grouting process, the seawater inside the device body is gradually discharged, and as the concrete mortar is grouted and filled, the positioning hole is closely attached to the inclined foundation pile; S5: After the inclined foundation piles are installed, remove the auxiliary installation body through the lifting device; S6: Build a wind turbine platform and a wind turbine tower on the top surface of the inclined foundation pile.

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