Single pile foundation supporting device

Abstract

The utility model belongs to the technical field of offshore wind power single pile foundation construction, and discloses a single pile foundation supporting device which comprises a sleeve, multiple inclined struts, pile shoes and a pile, the sleeve is arranged on the outer wall of the single pile in a sleeved mode, one ends of the multiple inclined struts are evenly connected to the outer wall of the sleeve in the circumferential direction of the sleeve, and the inclined struts correspond to the pile shoes one to one. The other ends of the inclined struts are connected to the corresponding pile shoes to provide supporting force for the sleeve, the piles correspond to the pile shoes one to one, the multiple piles are inserted into the multiple pile shoes one to one and extend into the seabed, then the sleeve is stably supported on the seabed, the rigidity of the single-pile foundation is improved, the overall frequency of the single-pile foundation is increased, the rotation excitation frequency of a wind wheel is avoided, and the service life of the single-pile foundation is prolonged. And the application water depth range of the single pile foundation is expanded, so that the single pile foundation can be applied to a large-megawatt wind turbine generator.

Description

Technical Field

[0001] This utility model relates to the field of offshore wind power monopile foundation construction technology, and in particular to a monopile foundation support device. Background Technology

[0002] With the increasing size of wind turbines and the use of ultra-long flexible blades, the excitation frequency of wind turbine rotation is continuously decreasing. However, the diameter and wall thickness of monopile foundations are limited by manufacturing, transportation, and construction capabilities. In addition, the pile length increases in deep-sea areas, resulting in the overall stiffness of slender monopile foundations being lower than that of multi-pile foundations such as jacket foundations, multi-legged foundations, and high-pile cap foundations. This makes it difficult for the overall turbine frequency to avoid the excitation frequency of wind turbine rotation, leading to resonance. Therefore, under the current situation where large-megawatt wind turbines are the mainstream, the application of monopile foundations in water depths of more than 40 meters has significant limitations. To meet the frequency requirements of large wind turbines, jacket foundations are often used in water depths of more than 40 meters. However, jacket foundations require a large amount of steel, have high manufacturing costs, and the cost increases with water depth. Furthermore, they have many joints and significant fatigue effects.

[0003] In summary, there is an urgent need to improve the stiffness of monopile foundations in order to expand the range of water depths in which monopile foundations can be applied. Utility Model Content

[0004] The purpose of this utility model is to provide a monopile foundation support device to improve the rigidity of the monopile foundation and increase the overall operating frequency of the monopile foundation.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A monopile foundation support device includes a sleeve, diagonal braces, pile shoes, and piles. The sleeve is fitted onto the outer wall of the monopile. Multiple diagonal braces are provided, with one end of each diagonal brace uniformly connected to the outer wall of the sleeve along the circumference of the sleeve. Each diagonal brace corresponds to a pile shoe and a pile. The other end of each diagonal brace is connected to a corresponding pile shoe. Multiple piles are inserted into multiple pile shoes and extend into the seabed.

[0007] Preferably, the sleeve and the plurality of pile shoes are all vertically arranged, the plurality of diagonal braces are arranged at the same height, and the diagonal braces and the sleeve cooperate to form an inclination angle α, wherein α is 30-45°.

[0008] Preferably, one end of the diagonal brace is welded to the outer wall of the sleeve, and the other end of the diagonal brace is welded to the outer wall of the corresponding pile shoe.

[0009] Preferably, the inner wall of the sleeve and the outer wall of the monopile have a first circumferential joint, which is filled with grout to connect the sleeve and the monopile.

[0010] Preferably, the first circumferential gap is 700-800 mm.

[0011] Preferably, the inner wall of the pile shoe and the outer wall of the pile have a second circumferential joint, which is filled with grout to connect the pile shoe and the pile.

[0012] Preferably, the monopile foundation support device further includes an annular sealing plate that covers the top of the first annular joint, with the inner circumferential side of the sealing plate connected to the inner wall of the monopile and the outer circumferential side of the sealing plate connected to the inner wall of the sleeve.

[0013] Preferably, the sleeve, the diagonal brace, the pile shoe, and the pile are all made of steel.

[0014] Preferably, the compressive strength of the grout is not less than 120 MPa.

[0015] Preferably, the inner wall of the sleeve has a first annular joint between it and the outer wall of the single pile, and the inner wall of the pile shoe has a second annular joint between it and the outer wall of the pile. Sealers are installed at the bottom of both the first and second annular joints to seal the bottom of the first and second annular joints.

[0016] The beneficial effects of this utility model are:

[0017] This utility model provides a monopile foundation support device, including a sleeve, diagonal braces, pile shoes, and piles. The sleeve is fitted onto the outer wall of the monopile. Multiple diagonal braces are provided, with one end of each brace evenly connected to the outer wall of the sleeve along the circumference. Each diagonal brace corresponds to a pile shoe, and the other end of each brace is connected to the corresponding pile shoe to provide support for the sleeve. Each pile corresponds to a pile shoe, and multiple piles are inserted into multiple pile shoes and extend into the seabed, thereby stably supporting the sleeve on the seabed, improving the rigidity of the monopile foundation, increasing the overall frequency of the monopile foundation, thus avoiding the excitation frequency of the wind turbine rotation, expanding the application depth range of the monopile foundation, and enabling its application in large-megawatt wind turbine units. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the monopile foundation support device provided in this embodiment of the utility model;

[0019] Figure 2 This is a top view of the monopile foundation support device provided in this embodiment of the utility model.

[0020] In the picture:

[0021] 10. Monopile; 20. Seabed;

[0022] 1. Sleeve; 2. Diagonal brace; 3. Pile shoe; 4. Pile; 5. Sealing plate. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] This embodiment provides a monopile foundation support device that improves the rigidity of the monopile foundation, increases the overall frequency of the monopile foundation, thereby avoiding the excitation frequency of the wind turbine rotation, expanding the application depth range of the monopile foundation, enabling its application in large-megawatt wind turbine units, and significantly saving steel, improving construction efficiency, and greatly shortening the construction period, thus achieving the goal of cost reduction.

[0028] Please see Figure 1 and Figure 2A monopile foundation support device includes a sleeve 1, a diagonal brace 2, a pile shoe 3, and a pile 4. The sleeve 1 is fitted onto the outer wall of the monopile 10 and forms a connection with the monopile 10. The diagonal brace 2 is used to connect the sleeve 1 and the pile shoe 3 and to provide support for the sleeve 1. The pile 4 is inserted into the pile shoe 3 and extends into the seabed 20, thereby stably supporting the sleeve 1 on the seabed 20, improving the rigidity of the monopile 10 foundation, and increasing the overall machine frequency of the monopile 10 foundation.

[0029] In this embodiment, the sleeve 1, diagonal brace 2, pile shoe 3, and pile 4 are all made of steel. Specifically, structural steel for shipbuilding and marine engineering or low-alloy high-strength structural steel, such as DH36 and Q355C, are used. The reinforced parts of the nodes should be made of steel with resistance to lamellar tearing, such as Z35.

[0030] Specifically, a single pile 10 is inserted into a sleeve 1, which is vertically positioned, and the single pile 10 and the sleeve 1 are connected by grouting. Specifically, the inner diameter of the sleeve 1 is larger than the outer diameter of the single pile 10, so that a first circumferential joint is formed between the inner wall of the sleeve 1 and the outer wall of the single pile 10. Grouting material is filled into the first circumferential joint, thereby connecting the sleeve 1 and the single pile 10 after the grouting material solidifies. Preferably, the first circumferential joint is 700-800 mm, and the compressive strength of the grouting material is not less than 120 MPa.

[0031] Furthermore, the monopile foundation support device also includes a packer and a sealing plate 5, wherein the packer is used to seal the bottom of the first circumferential joint, and the sealing plate 5 is used to seal the top of the first circumferential joint. By setting the packer and the sealing plate 5, the grouting connection between the monopile 10 and the sleeve 1 is achieved. Preferably, the sealing plate 5 is annular, with its inner circumferential side connected to the inner wall of the monopile 10, and its outer circumferential side connected to the inner wall of the sleeve 1.

[0032] Before grouting the connection between the monopile 10 and the sleeve 1, the monopile 10 needs to be driven into the ground 4. The monopile foundation support device provided in this embodiment is lifted by a floating crane vessel, the sleeve 1 is put into the monopile 10, and slowly lowered to the surface of the seabed 20. During this process, the sleeve 1 should be avoided from colliding with the monopile 10 to prevent damage to the anti-corrosion coating on the outer wall of the monopile 10.

[0033] Specifically, the grouting connection between the single pile 10 and the sleeve 1 includes the following steps:

[0034] A packer is installed at the bottom of the first circumferential joint between sleeve 1 and single pile 10, and bottom grouting is performed. After 24 hours of bottom grouting, the grouting pipeline is connected, with the grouting port of the pipeline located above the packer. Preferably, the packer is a commercially available, technologically mature packer, and its structure will not be described in detail here.

[0035] Prepare and lubricate the pipe, pour the mixed grout into the grouting port of the grouting pipeline, and pump it from bottom to top to replace the seawater in the first ring joint. During the grouting process, use an underwater camera in conjunction with divers to observe whether there are any leaks in the grouting pipeline.

[0036] After the first ring joint is filled with grout and grout overflows from the top of the first ring joint, pressure grouting is applied.

[0037] Finally, the diver went underwater to install the sealing plate 5 at the top of the first circumferential joint.

[0038] In order to ensure that the grouting quality is effectively controlled, in addition to witnessing the sampling and testing of the grouting material upon arrival at the site, on-site testing is also required during the grouting process. At the same time, test blocks are made and sent for third-party testing. On-site testing items usually include grouting material temperature, fluidity, apparent density and other items.

[0039] Specifically, multiple diagonal braces 2 are provided, and these multiple diagonal braces 2 are evenly arranged around the sleeve 1 in a circumferential direction. Furthermore, the multiple diagonal braces 2 are arranged at the same height to ensure that the sleeve 1 is subjected to uniform force and to prevent it from tilting. It can be understood that the more diagonal braces 2 there are, the greater the supporting force provided to the sleeve 1. Therefore, the number of diagonal braces 2 is determined according to the collection frequency requirements of the single pile 10 foundation, and no specific limit is made here.

[0040] Preferably, one end of the diagonal brace 2 is connected to the outer wall of the sleeve 1. In this embodiment, one end of the diagonal brace 2 is welded to the sleeve 1, resulting in a strong connection.

[0041] More preferably, the inclined brace 2 and the sleeve 1 are fitted together to form an inclination angle α, where α is 30-45°. The inclination angle α is determined according to the overall frequency of the single pile 10 foundation. It should be noted that the larger α is, the greater the lateral stiffness provided by the inclined brace 2.

[0042] Accordingly, the pile shoes 3 and the diagonal braces 2 are arranged in a one-to-one correspondence, that is, the number of pile shoes 3 is equal to the number of diagonal braces 2, and the multiple pile shoes 3 are evenly arranged circumferentially around the outer periphery of the sleeve 1. Furthermore, the other ends of the multiple diagonal braces 2 are connected to the outer wall of the pile shoes 3 in a one-to-one correspondence.

[0043] In this embodiment, the other ends of the multiple diagonal braces 2 are welded to the multiple pile shoes 3 one by one, resulting in a high connection strength.

[0044] Furthermore, piles 4 and pile shoes 3 are set in a one-to-one correspondence, that is, the number of piles 4 is equal to the number of pile shoes 3, and multiple piles 4 are inserted into multiple pile shoes 3 and extend into the seabed 20. It should be noted that the penetration depth of piles 4 is determined by calculation using the finite element software SACS. Specifically, the calculation includes strength and deformation verification of the single pile foundation support device, foundation bearing capacity verification of piles 4, fatigue verification of the single pile foundation support device, and overall machine frequency verification.

[0045] In this embodiment, multiple pile shoes 3 are all vertically arranged, and the sleeve 1 is higher than the pile shoes 3.

[0046] Similarly, pile 4 and pile shoe 3 are connected by grouting. Specifically, the inner diameter of pile shoe 3 is larger than the outer diameter of pile 4, so that a second circumferential joint is formed between the inner wall of pile shoe 3 and the outer wall of pile 4. The grouting material is filled into the second circumferential joint, thereby connecting pile shoe 3 and pile 4 after the grouting material solidifies.

[0047] Furthermore, another packer is installed at the bottom of the second annular joint to seal the bottom of the second annular joint. Another sealing plate 5 is installed at the bottom of the second annular joint to seal the top of the second annular joint. By setting the packer and the sealing plate 5, the grouting connection between the pile shoe 3 and the pile 4 is realized. The sealing plate 5 is annular in shape. The inner circumferential side of the sealing plate 5 is connected to the inner wall of the pile 4, and the outer circumferential side of the sealing plate 5 is connected to the inner wall of the pile shoe 3.

[0048] Before grouting the connection between pile shoe 3 and pile 4, pile 4 is slowly lowered into the corresponding pile shoe 3 and inserted into the seabed 20 until the preset depth of pile 4 is reached.

[0049] Specifically, the grouting connection between pile shoe 3 and pile 4 includes the following steps:

[0050] Install a packer at the bottom of the second circumferential joint between pile shoe 3 and pile 4, and perform bottom sealing grouting. After 24 hours of bottom sealing grouting, connect the grouting pipeline, with the grouting port of the grouting pipeline located above the packer.

[0051] Prepare and lubricate the pipe, pour the mixed grout into the grouting port of the grouting pipeline, and pump it from bottom to top to replace the seawater in the second annular joint.

[0052] After the second ring joint is filled with grout and grout overflows from the top of the second ring joint, pressure grouting is applied.

[0053] Finally, the diver went underwater to install the sealing plate 5 at the top of the second ring seam.

[0054] The monopile foundation support device provided in this embodiment provides sufficient lateral support force for the monopile 10 foundation, thereby improving the rigidity of the monopile 10 foundation, increasing the overall frequency of the monopile 10 foundation, thus avoiding the excitation frequency of the wind turbine rotation, expanding the application depth range of the monopile 10 foundation, enabling it to be applied to large megawatt wind turbine units, and saving a lot of steel, improving construction efficiency, and greatly shortening the construction period, thus achieving the goal of cost reduction.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A monopile foundation support device, characterized in that, The system includes a sleeve (1), a brace (2), and a pile shoe (3). The sleeve (1) is fitted onto the outer wall of the single pile (10). There are multiple braces (2). One end of each brace (2) is uniformly connected to the outer wall of the sleeve (1) in a circumferential direction. Each brace (2) corresponds to a pile shoe (3) and a pile (4). The other end of each brace (2) is connected to the corresponding pile shoe (3). Multiple piles (4) are inserted into multiple pile shoes (3) and extend into the seabed (20).

2. The monopile foundation support device according to claim 1, characterized in that, The sleeve (1) and the multiple pile shoes (3) are all vertically arranged, and the multiple diagonal braces (2) are arranged at the same height. The diagonal braces (2) and the sleeve (1) cooperate to form an inclination angle α, where α is 30-45°.

3. The monopile foundation support device according to claim 1, characterized in that, One end of the diagonal brace (2) is welded to the outer wall of the sleeve (1), and the other end of the diagonal brace (2) is welded to the outer wall of the corresponding pile shoe (3).

4. A monopile foundation support device according to claim 1, characterized in that, There is a first annular joint between the inner wall of the sleeve (1) and the outer wall of the single pile (10), and the first annular joint is filled with grout to connect the sleeve (1) and the single pile (10).

5. A monopile foundation support device according to claim 4, characterized in that, The first circumferential seam is 700-800 mm.

6. A monopile foundation support device according to claim 1, characterized in that, There is a second annular joint between the inner wall of the pile shoe (3) and the outer wall of the pile (4), and the second annular joint is filled with grout to connect the pile shoe (3) and the pile (4).

7. A monopile foundation support device according to claim 4, characterized in that, The monopile foundation support device also includes a ring-shaped sealing plate (5), which covers the top of the first annular seam, and the inner circumferential side of the sealing plate (5) is connected to the inner wall of the monopile (10), and the outer circumferential side of the sealing plate (5) is connected to the inner wall of the sleeve (1).

8. A monopile foundation support device according to any one of claims 1-7, characterized in that, The sleeve (1), the diagonal brace (2), the pile shoe (3), and the pile (4) are all made of steel.

9. A monopile foundation support device according to claim 4 or 5, characterized in that, The compressive strength of the grouting material shall not be less than 120 MPa.

10. A monopile foundation support device according to any one of claims 1-7, characterized in that, The inner wall of the sleeve (1) and the outer wall of the single pile (10) have a first annular joint, and the inner wall of the pile shoe (3) and the outer wall of the pile (4) have a second annular joint. Sealers are installed at the bottom of the first annular joint and the bottom of the second annular joint to seal the bottom of the first annular joint and the bottom of the second annular joint.

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