Cantilever bucket structure offshore wind power single pile foundation and method using mortise and tenon joints

Abstract

A cantilevered bucket structure offshore wind power single pile foundation and method using mortise and tenon connection nodes, comprising a pile body, a tenon, a mortise groove, a cantilever plate, and a barrel body; the mortise groove is connected to the pile body, with multiple mortise grooves symmetrically arranged along the outer wall of the pile body, the mortise groove is parallel to the axis of the pile body, the tenon and the mortise groove cooperate, the cantilever plate is connected to the tenon, and the barrel body is connected to the cantilever plate; the axial direction of the barrel body is consistent with the axial direction of the pile body, and the barrel body surrounds the lower part of the mud surface around the foundation. A cantilevered bucket structure offshore wind power single pile foundation using mortise and tenon connection nodes overcomes the problems of the original large-diameter pile body's performance degradation when bearing horizontal and axial loads, and poor stability when subjected to impact; it improves the pile body's bearing capacity and stability, avoids horizontal tilting of the pile body, and has the characteristics of components suitable for modular production, convenient and quick structural installation, high strength, good tensile and pullout resistance, and simple and convenient operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power, and relates to a cantilever bucket structure offshore wind power single pile foundation using mortise and tenon connection nodes and a method thereof. Background Art

[0002] At present, domestic offshore wind power infrastructure structures are mainly composed of single pile foundations, jacket foundations, high pile cap foundations, and barrel foundations. Single pile foundations are large-diameter steel pipe piles. They have the advantages of clear structural stress, simple manufacturing and construction processes, and a short construction period. They are the most commonly used foundation type for offshore wind farms with water depths below 30m, accounting for more than 60% of the foundation types of offshore wind farms built worldwide. With the further development of offshore wind power, the water depth of offshore wind farms will increase from 30m to 60m. At the same time, in order to meet the support structure bearing capacity requirements of large-capacity units, single pile foundations with larger pile diameters and longer pile lengths will be required. During the operation of offshore wind turbines, single pile foundations need to withstand the loads generated by the coupling of generators, wind, waves, ocean currents, and sea ice. Domestic and international research indicates that as large-diameter steel pipe piles increase in diameter and length, as well as unit capacity, they must withstand greater horizontal and axial loads. These forces make ultra-large diameter, thin-walled steel pipe piles susceptible to bending and buckling failure. These ultra-large diameter piles also present new challenges to existing offshore installation equipment and construction techniques. During the transportation, installation, and operation of single-layer, thin-walled monopile structures, unavoidable random loads often occur. These include cross-sectional elliptical deformation caused by the weight of the large-diameter pile during transportation, damage to the pile from seabed debris during driving, and defects caused by the impact and compression of floating ice during operation, all of which reduce the pile's bearing capacity and bending resistance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a cantilever bucket structure offshore wind power single pile foundation using mortise and tenon connection nodes. The structure is simple, and multiple mortise and tenons are symmetrically distributed outside the pile body. The tenon is connected to the cantilever plate, and the barrel body is connected to the cantilever plate. The mortise and tenon are connected by tenon matching, and the tenon and the barrel body are connected to the cantilever plate by fasteners. The barrel body surrounds the lower part of the mud surface around the foundation, thereby improving the bearing capacity and stability of the pile body and avoiding horizontal tilting of the pile body. The installation is convenient and quick, the strength is high, the tensile and pull-out resistance is good, and the operation is simple and convenient.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a cantilever bucket structure offshore wind power single pile foundation using mortise and tenon connection nodes, which includes a pile body, a mortise and tenon, a tenon, a cantilever plate and a barrel body; the mortise and tenon are connected to the pile body, and multiple mortise and tenon grooves are symmetrically arranged along the outer wall of the pile body, the mortise and tenon grooves are parallel to the axis of the pile body, the tenon and the tenon groove cooperate, the cantilever plate and the tenon are connected, and the barrel body and the cantilever plate are connected; the axial direction of the barrel body is consistent with the axial direction of the pile body.

[0005] The mortise and tenon grooves are wedge-shaped structures that are wide at the top and narrow at the bottom.

[0006] The tail of the tenon is a U-shaped groove structure, and one end that cooperates with the mortise and tenon groove is consistent with it.

[0007] The cantilever plate is a right-angled trapezoidal structure, and the end portion is a wedge-shaped structure that is wide at the top and narrow at the bottom.

[0008] The barrel body is a hollow cylindrical structure with openings at both ends, and the clamping plates arranged on the outer wall are connected to the cantilever plates.

[0009] The connection between the two ends of the cantilever plate and the clamping plates and tenons of the barrel body is a fastener connection.

[0010] The height of the clamping plate is one quarter of the length of the cantilever plate arm.

[0011] The arm length of the cantilever plate is 0.5-0.8 times the diameter of the pile body; the length of the connection between the cantilever plate and the mortise and tenon is 0.6-1.0 times the diameter of the pile body; the length of the connection between the cantilever plate and the barrel body is 0.3-0.5 times the diameter of the pile body.

[0012] The diameter of the barrel body is 0.6 to 1.0 times the diameter of the pile body; the depth of the barrel body is 0.4 to 0.6 times the diameter of the pile body.

[0013] The installation method of the cantilever bucket structure offshore wind power monopile foundation using the mortise and tenon joints as described above comprises the following steps:

[0014] S1, welding the tenons: Fully weld multiple tenons to the pile body, with the larger notch of the tenon facing upward; the tenons are horizontally symmetrically distributed, with the curved side of the tenon in contact with the outer wall of the pile body; the tenons are angled at 60° or 90°; the height of the upper end of the tenon weld is greater than the height of the pile body inserted into the foundation mud surface, and the height of the lower end of the tenon weld is less than the height of the pile body inserted into the foundation mud surface;

[0015] S2, assemble the tenon and the cantilever plate, with the inclined side of the cantilever plate facing upward, and fasteners pass through both sides of the mortise and tenon groove and the mounting holes on the cantilever plate to connect and secure;

[0016] S3, assembling the cantilever plate and the barrel body, fitting the clamping plate on the barrel body with the other end of the cantilever plate, and fastening the clamping plate through the mounting holes on both sides of the clamping plate and the cantilever plate to secure the barrel body;

[0017] S4, piling: Use a pile driver to drive the pile into the seabed. Stop when the driving depth reaches the design requirement. At this point, the upper end of the mortise on the pile is visible on the foundation mud surface. Clean the mud surface around the mortise until the mortise is completely exposed.

[0018] S5. Assemble the cantilever barrel to the pile body, with the smaller end of the tenon facing downwards and the U-shaped groove at the tail facing outwards, insert it from the upper end of the mortise and tenon groove, and stop when the tenon and the mortise groove are completely aligned;

[0019] S6, backfilling, backfilling the mud and sand around the pile body, and burying the barrel, cantilever plate and mortise and tenon joints with mud and sand.

[0020] A cantilevered bucket structure offshore wind power single pile foundation using mortise and tenon connection nodes comprises a pile body, mortise and tenon joints, tenons, cantilever plates, and a barrel body. The mortise and tenon joints are connected to the pile body, with multiple mortise and tenon joints arranged radially along the outer wall of the pile body in a circular pattern. The mortise and tenon grooves are parallel to the axis of the pile body, the tenons cooperate with the mortise and tenon grooves, the cantilever plates are connected to the tenons, and the barrel body is connected to the cantilever plates. The axial direction of the barrel body is consistent with the axial direction of the pile body. The structure is simple, with multiple horizontally symmetrical mortise and tenon grooves arranged outside the pile body, the tenons connected to the cantilever plates, the barrel body connected to the cantilever plates, the mortise and tenon joints connected by the tenons, the tenons and the barrel body connected to the cantilever plates by fasteners, and the barrel body surrounding the lower part of the mud surface surrounding the foundation, thereby improving the bearing capacity and stability of the pile body and preventing the pile body from tilting horizontally. The foundation is easy and quick to install, has high strength, good tensile and pullout resistance, and is simple and convenient to operate.

[0021] In the preferred embodiment, the mortise and tenon groove is a wedge-shaped structure that is wide at the top and narrow at the bottom. This simple structure allows for easy installation by inserting the tenon into the groove from top to bottom. The tenon then slides down under its own weight until it fits perfectly into the groove. This allows for quick and easy installation, and eliminates the need for welding during underwater installation, making the process simple.

[0022] In the preferred embodiment, the tail of the tenon is a U-shaped groove structure, and the end that mates with the mortise and tenon groove is aligned with it. This structure is simple and, during manufacturing, multiple mounting holes of the same module are provided on both sides of the U-shaped groove and on the end that mates with the cantilever plate. During installation, the U-shaped groove at the tail of the tenon mates with one end of the cantilever plate, and fasteners pass through the U-shaped groove and the mounting holes in the cantilever plate to secure the connection. This connection is convenient and quick, and can be completed in the factory.

[0023] In a preferred embodiment, the cantilever plate has a right-angled trapezoidal structure, with its ends forming a wedge-shaped structure that is wider at the top and narrower at the bottom. This structure is simple, and during fabrication, the thickness of one side of the right-angled trapezoidal cantilever plate's oblique edge is thicker than the corresponding side. During installation, the cantilever plate's oblique edge faces upward, providing better load bearing. The upper side of the barrel connected to the cantilever plate is lower than the cantilever plate's oblique edge. After being buried in the mud, the barrel is buried deeper than the cantilever plate, which helps prevent the pile from tilting horizontally.

[0024] In the preferred embodiment, the barrel body is a hollow cylindrical structure with two open ends, and a clamping plate provided on the outer wall is connected to the cantilever plate. The structure is simple, and during manufacture, the number of clamping plates is two. After welding, the clamping groove formed between the two clamping plates mates with one end of the cantilever plate.

[0025] In a preferred embodiment, the connection between the clamping plates and the tenons at both ends of the cantilever plate and the barrel body is a fastener connection. This has a simple structure. When in use, the barrel body and the tenon at both ends of the cantilever plate are connected by fasteners without welding. The installation is convenient and fast, which is conducive to modular processing and saves costs.

[0026] In the preferred solution, the height of the clamping plate is one-fourth of the length of the cantilever plate arm. The structure is simple, and when in use, when the height of the clamping plate is one-fourth of the length of the cantilever plate arm, the force is balanced and the anti-twisting effect is good.

[0027] In a preferred embodiment, the cantilever plate's arm length is 0.5 to 0.8 times the pile diameter; the length of the cantilever plate's mortise and tenon joint is 0.6 to 1.0 times the pile diameter; and the length of the cantilever plate's connection with the barrel is 0.3 to 0.5 times the pile diameter. This structure is simple, and when in use, the pile body experiences optimal bearing capacity and good stability when the cantilever plate's arm length is 0.5 to 0.8 times the pile diameter, the length of the cantilever plate's mortise and tenon joint is 0.6 to 1.0 times the pile diameter, and the length of the cantilever plate's connection with the barrel is 0.3 to 0.5 times the pile diameter.

[0028] In the preferred embodiment, the barrel diameter is 0.6 to 1.0 times the pile diameter; the barrel depth is 0.4 to 0.6 times the pile diameter. This structure is simple, and when used, when the barrel diameter is 0.6 to 1.0 times the pile diameter and the barrel depth is 0.4 to 0.6 times the pile diameter, the shock absorption and energy dissipation effect is optimal when the pile is impacted.

[0029] In a preferred solution, the installation method of the cantilever bucket structure offshore wind power monopile foundation using the mortise and tenon joints as described above comprises the following steps:

[0030] S1, welding the tenons: Fully weld multiple tenons to the pile body, with the larger notch of the tenon facing upward; the tenons are horizontally symmetrically distributed, with the curved side of the tenon in contact with the outer wall of the pile body; the tenons are angled at 60° or 90°; the height of the upper end of the tenon weld is greater than the height of the pile body inserted into the foundation mud surface, and the height of the lower end of the tenon weld is less than the height of the pile body inserted into the foundation mud surface;

[0031] S2, assemble the tenon and the cantilever plate, with the inclined side of the cantilever plate facing upward, and fasteners pass through both sides of the mortise and tenon groove and the mounting holes on the cantilever plate to connect and secure;

[0032] S3, assembling the cantilever plate and the barrel body, fitting the clamping plate on the barrel body with the other end of the cantilever plate, and fastening the clamping plate through the mounting holes on both sides of the clamping plate and the cantilever plate to secure the barrel body;

[0033] S4, piling: Use a pile driver to drive the pile into the seabed. Stop when the driving depth reaches the design requirement. At this point, the upper end of the mortise on the pile is visible on the foundation mud surface. Clean the mud surface around the mortise until the mortise is completely exposed.

[0034] S5. Assemble the cantilever barrel to the pile body, with the smaller end of the tenon facing downwards and the U-shaped groove at the tail facing outwards, insert it from the upper end of the mortise and tenon groove, and stop when the tenon and the mortise groove are completely aligned;

[0035] S6, backfilling, backfilling the mud and sand around the pile body, and burying the barrel, cantilever plate and mortise and tenon joints with mud and sand.

[0036] A cantilever bucket structure offshore wind turbine single pile foundation and method utilizing mortise and tenon joints comprises a pile body, a mortise and tenon groove, a tenon, a cantilever plate, and a barrel body. The mortise and tenon groove connect the pile body, with multiple mortise and tenon joints arranged horizontally symmetrically along the outer wall of the pile body. The mortise and tenon grooves are parallel to the axis of the pile body, the tenons and tenon grooves mate, the cantilever plate and the barrel body connect to the cantilever plate, and the barrel body connects to the cantilever plate. The barrel body aligns with the axis of the pile body. The structure is simple, with multiple horizontally symmetrical mortise and tenon joints arranged outside the pile body. The tenons and tenon joints connect the cantilever plate, the barrel body connects to the cantilever plate, the tenon and tenon joints mate, and the barrel body and the cantilever plate are fastened together. The barrel body surrounds the foundation below the mud surface. This overcomes the problems of conventional large-diameter pile bodies, which suffer from reduced performance when bearing horizontal and axial loads and poor stability under impact. The structure is simple, improves the pile body's bearing capacity and stability, prevents horizontal tilt, and offers convenient and quick installation, high strength, excellent tensile and pullout resistance, and easy and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and examples:

[0038] Figure 1 It is a structural schematic diagram of the present invention.

[0039] Figure 2 It is a structural diagram of the connection between the various components of the present invention.

[0040] Figure 3 It is a structural schematic diagram of the mortise and tenon joint of the present invention.

[0041] Figure 4 It is a structural schematic diagram of the tenon of the present invention.

[0042] Figure 5 for Figure 4 Schematic top view of .

[0043] Figure 6 It is a structural schematic diagram of the cantilever plate of the present invention.

[0044] Figure 7 It is a structural schematic diagram of the barrel body of the present invention.

[0045] Figure 8 It is a structural schematic diagram of the connection between the barrel body and the cantilever plate of the present invention.

[0046] In the figure: pile body 1, tenon 2, tenon end 21, tenon 3, cantilever plate 4, barrel body 5, splint 51. DETAILED DESCRIPTION

[0047] like Figures 1 to 8 A cantilever bucket structure offshore wind power monopile foundation using a mortise and tenon connection node is disclosed. The foundation comprises a pile body 1, a mortise and tenon groove 2, a tenon 3, a cantilever plate 4, and a barrel body 5. The mortise and tenon 2 is connected to the pile body 1, with multiple mortise and tenon grooves 2 arranged horizontally and symmetrically along the outer wall of the pile body 1. The mortise and tenon grooves 21 are parallel to the axis of the pile body 1, the tenon 3 cooperates with the tenon groove end 21, the cantilever plate 4 is connected to the tenon 3, and the barrel body 5 is connected to the cantilever plate 4. The axial direction of the barrel body 5 is consistent with the axial direction of the pile body 1. The foundation has a simple structure. Multiple mortise and tenon grooves 2 are arranged in a circular radial pattern on the outside of the pile body 1, the tenon 3 is connected to the cantilever plate 4, and the barrel body 5 is connected to the cantilever plate 4. The mortise and tenon grooves 2 are connected by the tenon 3, and the tenon 3 and the barrel body 5 are connected to the cantilever plate 4 by fasteners. The barrel body 5 surrounds the lower part of the mud surface around the foundation, thereby improving the bearing capacity and stability of the pile body 1 and preventing the pile body 1 from tilting horizontally. The foundation is convenient and quick to install, has high strength, good tensile and pullout resistance, and is simple and convenient to operate.

[0048] In a preferred embodiment, the mortise and tenon groove 2 and the mortise and tenon end 21 are wedge-shaped structures that are wide at the top and narrow at the bottom. This simple structure and the wedge-shaped structure of the mortise and tenon end 21 allow for easy installation by inserting the tenon 3 from top to bottom into the mortise and tenon groove 21. The tenon 3 then slides down under its own weight until it fits perfectly into the mortise and tenon groove 21. This allows for quick and easy installation, and eliminates the need for welding during underwater installation, simplifying the process.

[0049] In a preferred embodiment, the tail of the tenon 3 is a U-shaped groove structure, and the end that mates with the mortise and tenon groove 21 is aligned therewith. The structure is simple. During manufacturing, multiple mounting holes of the same module are provided on both sides of the U-shaped groove and on the end that mates with the cantilever plate 4. During installation, the U-shaped groove at the tail of the tenon 3 mates with one end of the cantilever plate 4, and fasteners are inserted through the U-shaped groove and the mounting holes on the cantilever plate 4 to secure the connection. This makes the connection quick and convenient, and can be installed in the factory.

[0050] In a preferred embodiment, the cantilever plate 4 is a right-angled trapezoidal structure with a wedge-shaped end that is wider at the top and narrower at the bottom. This structure is simple. During manufacture, the thickness of one side of the right-angled trapezoidal cantilever plate 4's hypotenuse is thicker than the corresponding side. During installation, the hypotenuse of the cantilever plate 4 faces upward, providing better load bearing. The upper side of the barrel body 5 connected to the cantilever plate 4 is lower than the hypotenuse of the cantilever plate 4. After being buried in the mud, the barrel body 5 is buried deeper than the cantilever plate 4, which helps prevent the pile body 1 from tilting horizontally.

[0051] In the preferred embodiment, the barrel body 5 is a hollow cylindrical structure with two ends open, and a clamping plate 51 provided on the outer wall is connected to the cantilever plate 4. The structure is simple. During production, the number of clamping plates 51 is two. After welding, the clamping groove formed between the two clamping plates 51 cooperates with one end of the cantilever plate 4.

[0052] Preferably, the end of the splint 51 that contacts the barrel body 5 extends outward in an arc shape and contacts the outer wall of the barrel body 5, so that the welding is fully completed to improve the overall structural strength.

[0053] In a preferred embodiment, the connection between the two ends of the cantilever plate 4 and the clamping plate 51 of the barrel body 5 and the tenon 3 is a fastener connection. The structure is simple. When in use, the barrel body 5 and the tenon 3 at the two ends of the cantilever plate 4 are connected by fasteners, without welding. The installation is convenient and fast, which is conducive to modular processing and saves costs.

[0054] In the preferred embodiment, the height of the clamping plate 51 is one-fourth of the arm length of the cantilever plate 4. The structure is simple, and when in use, when the height of the clamping plate 51 is one-fourth of the arm length of the cantilever plate 4, the force is balanced and the anti-twisting effect is good.

[0055] In a preferred embodiment, the arm length of the cantilever plate 4 is 0.5 to 0.8 times the diameter of the pile shaft 1; the length of the connection between the cantilever plate 4 and the mortise and tenon 2 is 0.6 to 1.0 times the diameter of the pile shaft 1; and the length of the connection between the cantilever plate 4 and the barrel 5 is 0.3 to 0.5 times the diameter of the pile shaft 1. This structure is simple. During use, when the arm length of the cantilever plate 4 is 0.5 to 0.8 times the diameter of the pile shaft 1, the length of the connection between the cantilever plate 4 and the mortise and tenon 2 is 0.6 to 1.0 times the diameter of the pile shaft 1, and the length of the connection between the cantilever plate 4 and the barrel 5 is 0.3 to 0.5 times the diameter of the pile shaft 1, the pile shaft 1 is subjected to optimal bearing capacity and good stability.

[0056] In a preferred embodiment, the diameter of the barrel body 5 is 0.6 to 1.0 times the diameter of the pile body 1; the depth of the barrel body 5 is 0.4 to 0.6 times the diameter of the pile body 1. This structure is simple, and when in use, when the diameter of the barrel body 5 is 0.6 to 1.0 times the diameter of the pile body 1 and the depth of the barrel body 5 is 0.4 to 0.6 times the diameter of the pile body 1, the shock absorption and energy dissipation effect is optimal when the pile body 1 is impacted.

[0057] In a preferred solution, the installation method of the cantilever bucket structure offshore wind power monopile foundation using the mortise and tenon joints as described above comprises the following steps:

[0058] S1, welding the mortise and tenon joints, fully welding the plurality of mortise and tenon joints 2 to the pile body 1, with the larger cross-section of the mortise and tenon groove 21 facing upward; the plurality of mortise and tenon joints 2 are arranged in a circular radial pattern, with the curved side of the mortise and tenon joint 2 in contact with the outer wall of the pile body 1; the plurality of mortise and tenon joints 2 are at an angle of 60° or 90°; the height of the upper end of the mortise and tenon joint 2 being welded is greater than the height of the pile body 1 inserted into the foundation mud surface, and the height of the lower end of the mortise and tenon joint 2 being welded is less than the height of the pile body 1 inserted into the foundation mud surface;

[0059] S1, welding the tenons: Fully weld multiple tenons to the pile body, with the larger notch of the tenon facing upward; the tenons are horizontally symmetrically distributed, with the curved side of the tenon in contact with the outer wall of the pile body; the tenons are angled at 60° or 90°; the height of the upper end of the tenon weld is greater than the height of the pile body inserted into the foundation mud surface, and the height of the lower end of the tenon weld is less than the height of the pile body inserted into the foundation mud surface;

[0060] S2, assembling the tenon and the cantilever plate, with the inclined side of the cantilever plate facing upward, by inserting fasteners through both sides of the mortise and tenon groove and the mounting holes on the cantilever plate to secure them;

[0061] S3, assembling the cantilever plate and the barrel body, fitting the clamping plate on the barrel body with the other end of the cantilever plate, and fastening the clamping plate through the mounting holes on both sides of the clamping plate and the cantilever plate to secure the barrel body;

[0062] S4, piling: Use a pile driver to drive the pile into the seabed. Stop when the driving depth reaches the design requirement. At this point, the upper end of the mortise on the pile is visible on the foundation mud surface. Clean the mud surface around the mortise until the mortise is completely exposed.

[0063] S5. Assemble the cantilever barrel to the pile body, with the smaller end of the tenon facing downwards and the U-shaped groove at the tail facing outwards, insert it from the upper end of the mortise and tenon groove, and stop when the tenon and the mortise groove are completely aligned;

[0064] S6, backfilling, backfilling the mud and sand around the pile body, and burying the barrel, cantilever plate and mortise and tenon joints with mud and sand.

[0065] The cantilever bucket structure offshore wind power single pile foundation and method using mortise and tenon connection nodes as described above, when installed and used, a plurality of mortise and tenon grooves 2 are arranged on the outside of the pile body 1 in a horizontally symmetrical distribution, the tenon 3 is connected to the cantilever plate 4, the barrel body 5 is connected to the cantilever plate 4, the mortise and tenon grooves 2 are connected with the tenon 3, the tenon 3 and the barrel body 5 are connected to the cantilever plate 4 with fasteners, the barrel body 5 surrounds the lower part of the mud surface around the foundation, improves the bearing capacity and stability of the pile body 1, avoids horizontal tilting of the pile body 1, is easy and quick to install, has high strength, good tensile and pull-out resistance, and is simple and convenient to operate.

[0066] The mortise and tenon port 21 is a wedge-shaped structure that is wide at the top and narrow at the bottom. During installation, the tenon 3 is inserted into the mortise and tenon port 21 from top to bottom. The tenon 3 slides down under its own weight and completely fits into the mortise and tenon port 21 to connect. The installation is quick and easy. No welding is required during underwater installation, and the operation is simple.

[0067] During manufacturing, multiple mounting holes of the same module are set on both sides of the U-shaped groove and at one end of the cantilever plate 4. During installation, the U-shaped groove at the tail of the tenon 3 cooperates with one end of the cantilever plate 4, and the fasteners pass through the U-shaped groove and the mounting holes on the cantilever plate 4 to connect and fix. The connection is convenient and quick, and the installation can be completed in the factory.

[0068] During manufacturing, one side of the oblique side of the cantilever plate 4 of the right-angled trapezoidal structure is thicker than the thickness of the corresponding side. During installation, the oblique side of the cantilever plate 4 faces upward and has good force. The upper side of the barrel body 5 connected to the cantilever plate 4 is lower than the oblique side of the cantilever plate 4. After being buried in the mud surface, the barrel body 5 is buried deeper than the cantilever plate 4, which is beneficial to prevent the pile body 1 from tilting horizontally.

[0069] During manufacturing, the number of the clamping plates 51 is two. After welding, the clamping groove formed between the two clamping plates 51 is matched with one end of the cantilever plate 4.

[0070] When in use, fasteners are used to connect the barrel body 5 and the tenon 3 at both ends of the cantilever plate 4, without welding. The installation is convenient and quick, which is conducive to modular processing and saves costs.

[0071] When in use, when the height of the clamping plate 51 is one quarter of the arm length of the cantilever plate 4, the force is balanced and the anti-twisting effect is good.

[0072] During use, when the arm length of the cantilever plate 4 is 0.5-0.8 times the diameter of the pile body 1, the length of the connection between the cantilever plate 4 and the mortise and tenon 2 is 0.6-1.0 times the diameter of the pile body 1, and the length of the connection between the cantilever plate 4 and the barrel body 5 is 0.3-0.5 times the diameter of the pile body 1, the pile body 1 is subjected to optimal bearing capacity and has good stability.

[0073] During use, when the diameter of the barrel body 5 is 0.6 to 1.0 times the diameter of the pile body 1 and the depth of the barrel body 5 is 0.4 to 0.6 times the diameter of the pile body 1, the shock absorption and energy dissipation effect is optimal when the pile body 1 is impacted.

[0074] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The embodiments and features in the embodiments of this application may be arbitrarily combined with each other unless they conflict. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A cantilever bucket structure offshore wind power monopile foundation using mortise and tenon joints, characterized by: It comprises a pile body (1), a mortise (2), a tenon (3), a cantilever plate (4) and a barrel body (5); the mortise (2) is connected to the pile body (1), a plurality of mortise grooves (2) are symmetrically arranged along the outer wall of the pile body (1), the mortise end (21) is parallel to the axis of the pile body (1), the tenon (3) is matched with the mortise end (21), the cantilever plate (4) is connected to the tenon (3), and the barrel body (5) is connected to the cantilever plate (4); the axial direction of the barrel body (5) is consistent with the axial direction of the pile body (1); The mortise and tenon (2) and the mortise and tenon end (21) are wedge-shaped structures that are wide at the top and narrow at the bottom; The tail of the tenon (3) is a U-shaped groove structure, and one end that matches the tenon groove end (21) is aligned with it; The cantilever plate (4) is a right-angled trapezoidal structure, and the end portion is a wedge-shaped structure that is wide at the top and narrow at the bottom; The barrel body (5) is a hollow cylindrical structure with openings at both ends, and a clamping plate (51) provided on the outer wall is connected to the cantilever plate (4); The barrel (5) surrounds the lower part of the mud surface around the foundation.

2. The cantilever bucket structure offshore wind power monopile foundation using mortise and tenon joints according to claim 1 is characterized by: The connection between the two ends of the cantilever plate (4) and the clamping plate (51) and the tenon (3) of the barrel body (5) is a fastener connection.

3. The cantilever bucket structure offshore wind power monopile foundation using mortise and tenon joints according to claim 1 is characterized by: The height of the clamping plate (51) is one quarter of the arm length of the cantilever plate (4).

4. The cantilever bucket structure offshore wind power monopile foundation using mortise and tenon joints according to claim 1 is characterized by: The arm length of the cantilever plate (4) is 0.5 to 0.8 times the diameter of the pile body (1); the length of the connection between the cantilever plate (4) and the tongue and groove (2) is 0.6 to 1.0 times the diameter of the pile body (1); and the length of the connection between the cantilever plate (4) and the barrel body (5) is 0.3 to 0.5 times the diameter of the pile body (1).

5. The cantilever bucket structure offshore wind power monopile foundation using mortise and tenon joints according to claim 1 is characterized by: The diameter of the barrel body (5) is 0.6 to 1.0 times the diameter of the pile body (1); and the depth of the barrel body (5) is 0.4 to 0.6 times the diameter of the pile body (1).

6. The installation method of a cantilever bucket structure offshore wind power monopile foundation using mortise and tenon joints according to any one of claims 1 to 5, characterized in that: It includes the following steps: S1, welding the tenon grooves, fully welding the plurality of tenon grooves (2) to the pile body, with the larger notch of the tenon groove (2) facing upward; the plurality of tenon grooves (2) are horizontally symmetrically distributed, with the arc-shaped side of the tenon groove in contact with the outer wall of the pile body; the plurality of tenon grooves are at an angle of 60° or 90°; the height of the upper end of the tenon groove (2) welded is greater than the height of the pile body inserted into the foundation mud surface, and the height of the lower end of the tenon groove (2) welded is less than the height of the pile body inserted into the foundation mud surface; S2, assembling the tenon and the cantilever plate, placing the cantilever plate (4) with its inclined side facing upwards, and fastening the tenon and the cantilever plate through the mounting holes on both sides of the tenon groove and the cantilever plate to connect and fix; S3, assembling the cantilever plate and the barrel body, fitting the clamping plate on the barrel body (5) with the other end of the cantilever plate (4), and fasteners passing through the mounting holes on both sides of the clamping plate and the cantilever plate to connect and fix; S4, piling, using a pile driver to drive the pile body (1) into the seabed, and stop when the driving depth reaches the design requirement; at this time, the upper end of the tenon groove (2) on the pile body (1) is visible on the foundation mud surface; clean the mud surface around the tenon groove (2) until the tenon groove (2) is completely exposed; S5, assemble the cantilever barrel to the pile body, insert the tenon (3) with the smaller cross-section end facing downwards and the tail U-shaped groove facing outwards from the upper end of the mortise and tenon, and stop when the tenon and the mortise are completely aligned; S6, backfilling, backfilling the mud and sand around the pile body, and burying the barrel (5), the cantilever plate (4) and the tongue and groove (2) with mud and sand.

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