Reusable device for preventing excessive pile slipping of offshore single pile foundation and using method thereof

Abstract

The invention discloses a reusable device for preventing excessive pile slipping of an offshore single pile foundation and a use method of the reusable device, and belongs to the technical field of wind power foundation structure design. The device comprises a single pile foundation and an excessive pile slipping prevention platform detachably arranged on the single pile foundation; the excessive pile sliding prevention platform comprises a plurality of supporting beams arranged on the inner wall of the single pile foundation in the circumferential direction, the pile sliding prevention baffle comprises a main supporting plate and a grading baffle set, the excessive pile sliding prevention platform is provided with a gap part, when pile sliding occurs, the excessive pile sliding prevention platform can allow water to pass through the gap part, resistance is formed through the main supporting plate and the grading baffle set, and the pile sliding prevention baffle set is used for preventing pile sliding. And when the sliding pile is not released, the device can be detached and reused. Certain resistance can be formed when pile slipping occurs, the sinking speed of the single-pile foundation is effectively reduced, and excessive pile slipping is prevented. Meanwhile, the device can flexibly adjust the size, is convenient to disassemble and assemble, can meet the requirements of different seabed stratum conditions and pile slipping risk levels, and has good applicability.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power foundation structure design, and in particular relates to a reusable device for preventing an offshore single pile foundation from excessively slipping and a use method thereof. Background Art

[0002] With the continuous promotion of clean energy policies, the offshore wind power industry has ushered in unprecedented development opportunities. As the key supporting structure of offshore wind power facilities, the design, construction and maintenance of offshore wind power foundations are directly related to the safety and stability of the entire wind power generation system. Among the many foundation forms, large-diameter single pile foundations have become the most widely used foundation type in the offshore wind power field due to their simple structure and strong bearing capacity.

[0003] The construction of large-diameter single pile foundations usually adopts the hammering method, that is, the single pile foundation is sunk to a predetermined depth on the seabed by hammering. However, under complex seabed stratum conditions, hammering construction is often accompanied by the occurrence of pile slippage. Pile slippage, that is, the unexpected sinking of the single pile foundation due to uneven or sudden reduction of stratum resistance during the hammering process, is extremely unpredictable. If pile slippage occurs, it will not only have a serious impact on the progress of the project, but may also pose a threat to the stability and safety of the single pile foundation. The depth of pile slippage is a key factor in determining the difficulty of remedial measures. When the depth of pile slippage is too deep, causing the top flange of the foundation to fall below the water surface, the remedial work will become extremely difficult and costly. At this time, high-risk and high-cost remedial solutions such as underwater operations may be required. If the depth of pile slippage is shallow and the pile top flange is still above the water surface, then the remedial work is relatively simple and can usually be carried out by extending the pile body on the water surface. In order to deal with the problem of pile slippage, most of the solutions in the prior art focus on preventing and controlling the occurrence of pile slippage, such as optimizing the hammering construction process and strengthening stratum exploration. However, for now, there is still room for further optimization to improve the risk of pile slippage during the installation of single pile foundations by adopting optimized hammering and enhanced bottom layer exploration. Summary of the invention

[0004] The present invention provides a reusable device for preventing excessive pile slippage of an offshore single pile foundation and a method for using the device, aiming to solve the problem that the risk of pile slippage during the installation of a single pile foundation still needs to be further optimized by currently adopting optimized hammering and enhanced bottom exploration.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: The present invention provides a reusable device for preventing an offshore monopile foundation from excessively sliding piles, comprising a monopile foundation and an excessively sliding pile prevention platform detachably arranged on the monopile foundation, wherein the excessively sliding pile prevention platform comprises a plurality of supporting beams circumferentially arranged on the inner wall of the monopile foundation, and at least one of the supporting beams is detachably provided with an anti-sliding pile baffle; The anti-slip pile baffle includes a main support plate and a plurality of graded baffle groups. The main support plate is radial and forms a plurality of strip plates that can be installed corresponding to the supporting beam. At least one strip plate is provided with an end support, which can be arranged on the supporting beam. Different graded baffle groups are arranged between adjacent strip plates. The anti-excessive pile sliding platform has a gap portion. In the event of pile sliding, the anti-excessive pile sliding platform can allow water to pass through the gap portion and form resistance through the main support plate and the graded baffle group to prevent the single pile foundation from sinking.

[0006] In some embodiments, the supporting beam is a trough-shaped structure that opens upward, and the number of the supporting beams is four to sixteen. The number of the supporting beams is determined based on the geometric dimensions and force requirements of the single pile foundation.

[0007] In some embodiments, the end supports can be fixedly connected to the support beam.

[0008] In some embodiments, the gap portion includes a through hole provided in the middle of the main support plate and a water passing area formed along the axial direction of the anti-over-slip pile platform.

[0009] Furthermore, each graded baffle group includes arc-shaped baffles of different sizes, and a plurality of arc-shaped baffles are arranged in sequence along the inner wall from the through hole to the single pile foundation.

[0010] Furthermore, the number of graded baffles is adjusted and determined according to the risk level of pile slipping at the machine position. When the risk level of pile slipping at the machine position is high, the number of graded baffles is increased, and when the risk level of pile slipping at the machine position is low, the number of graded baffles is reduced.

[0011] Furthermore, the water passing area includes water passing holes reserved between adjacent arc-shaped baffles and a gap between the graded baffle group and the single pile foundation.

[0012] Furthermore, the sizes of the through holes, water holes and gaps are designed and formulated according to the diameter of the single pile foundation and the requirements of seawater resistance.

[0013] In some embodiments, the anti-overslip pile platform is detachably connected to the support beam.

[0014] The present invention also provides a method for using a reusable device for preventing excessive slippage of an offshore single pile foundation, comprising the following steps: S1. When manufacturing a single pile foundation, a platform for preventing excessive pile slippage is installed simultaneously to form a reusable device for preventing excessive pile slippage of an offshore single pile foundation; S2. Install a reusable device for preventing excessive pile slippage of offshore single pile foundations during offshore construction. If the single pile foundation slips, the excessive pile slippage prevention platform enters the water to prevent the single pile foundation from sinking. If there is no pile slippage in the single pile foundation, the anti-excessive pile slippage platform will be removed after the installation is completed.

[0015] Compared with the prior art, the reusable device for preventing excessive slippage of offshore single pile foundation and the use method thereof of the present invention have the following beneficial effects: The invention discloses a reusable device for preventing excessive pile slipping of an offshore monopile foundation, comprising a monopile foundation and an anti-excess pile slipping platform arranged on the monopile foundation, wherein the anti-excess pile slipping platform comprises a plurality of supporting beams arranged on the inner wall of the monopile foundation along the circumferential direction, at least one supporting beam is provided with an anti-pile slipping baffle in a detachable manner; the anti-pile slipping baffle comprises a main supporting plate and a graded baffle, the main supporting plate is radial and forms a plurality of strip plates that can be installed corresponding to the supporting beam, at least one strip plate is provided with an end support, the end support can be arranged on the supporting beam, the graded baffle group comprises a plurality of different arc baffles, and the different arc baffles are arranged between adjacent strip plates; the anti-excess pile slipping platform has a gap portion, and in the case of pile slipping, the anti-excess pile slipping platform can allow water to pass through the gap portion, and form resistance through the main supporting plate and the graded baffle group, so as to prevent the monopile foundation from sinking. The invention provides an additional support system for the monopile foundation by adding the anti-excess pile slipping platform on the monopile foundation, thereby enhancing its stability in complex strata. The anti-excessive pile slip platform can provide special protection against pile slip phenomenon, improving the overall safety of offshore wind power foundation. The supporting beams in the present invention are evenly distributed along the circumference, providing a solid support foundation for the anti-pile slip baffle, ensuring the stability and reliability of the device when pile slip occurs. The design of the supporting beam makes it easier to install and disassemble the anti-pile slip baffle, which is convenient for adjustment according to actual needs. The anti-pile slip baffle can quickly form resistance when pile slip occurs, effectively slowing down the sinking speed of the single pile foundation. As the main supporting component, the main support plate can withstand a large impact force and provide a solid support for the graded baffle. The graded baffle makes the resistance distribution more uniform and can provide effective protection in the case of pile slip at different depths. The number of graded baffles can be adjusted according to the risk level of pile slip. And the detachable design makes the anti-pile slip baffle easy to install or disassemble as needed, which is convenient for maintenance and replacement.

[0016] The present invention provides an anti-excessive pile sliding platform and utilizes the combined structure of the supporting beam and the anti-pile sliding baffle to form resistance when pile sliding occurs, thereby effectively slowing down the sinking speed of the single pile foundation and preventing excessive pile sliding. At the same time, the device is also detachable and adjustable, and the number and position of the anti-pile sliding baffle can be adjusted according to actual needs to adapt to different seabed formation conditions and pile sliding risk levels, and has better applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 It is a schematic elevational structural diagram of a reusable device for preventing excessive pile slippage of an offshore single pile foundation according to the present invention; Figure 2 It is a schematic diagram of a state of a single pile foundation (without an anti-pile slipping baffle installed) after the pile slips in a reusable device for preventing excessive pile slipping of an offshore single pile foundation according to the present invention; Figure 3 It is a schematic elevation view of a reusable device for preventing an offshore single pile foundation from excessively slipping (after the pile slips, the upper part of the single pile foundation is extended); Figure 4 It is an enlarged structural schematic diagram of an anti-over-slip pile platform in a reusable device for preventing over-slip piles of an offshore single pile foundation according to the present invention; Figure 5 It is an enlarged schematic diagram of a supporting beam in a reusable device for preventing excessive pile slippage of an offshore single pile foundation according to the present invention; Figure 6 It is a structural schematic diagram of an anti-pile slippage baffle in a reusable device for preventing excessive slippage of an offshore single pile foundation according to the present invention; Figure 7 It is a schematic plan view of a pile-slipping prevention baffle in a reusable device for preventing excessive pile slipping of an offshore single pile foundation according to the present invention; Figure 8 It is a structural schematic diagram of a main support plate and a grading baffle in a reusable device for preventing excessive pile slippage of an offshore single pile foundation according to the present invention; Fig. 9 The present invention is a schematic structural diagram of a main support plate in a reusable device for preventing excessive pile slippage of an offshore single pile foundation.

[0019] Reference numerals: 1, single pile foundation, 2, supporting beam, 3, anti-slip pile baffle; 31. Main support plate; 311, strip plate, 312, end support; 32. Grading baffle group; 321, arc-shaped baffle, 322, water hole; 33, through hole, 34, gap; 4. Fixing bolts, 5. Water surface, 6. Seabed surface, 7. Upper extension section. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1-Figure 9As shown, the reusable device for preventing excessive pile slipping of an offshore monopile foundation of the present invention comprises a monopile foundation 1 and an excessive pile slipping prevention platform detachably arranged on the monopile foundation 1, wherein the excessive pile slipping prevention platform comprises a plurality of supporting beams 2 circumferentially arranged on the inner wall of the monopile foundation 1, and at least one supporting beam 2 is detachably provided with an anti-pile slipping baffle 3; The anti-slip pile baffle 3 includes a main support plate 31 and a plurality of graded baffle groups 32. The main support plate 31 is radially shaped and forms a plurality of strip plates 311 that can be mounted corresponding to the supporting beam 2. At least one strip plate 311 is provided with an end support 312, which can be arranged on the supporting beam 2. Different graded baffle groups 32 are arranged between adjacent strip plates 311. The anti-excessive pile sliding platform has a gap portion. In the event of pile sliding, the anti-excessive pile sliding platform can allow water to pass through the gap portion and form resistance through the main support plate 31 and the graded baffle group 32 to prevent the single pile foundation 1 from sinking.

[0027] The reusable device for preventing excessive pile slippage of an offshore single pile foundation of the present invention comprises a supporting beam 2 welded on the single pile foundation 1 and an anti-pile slippage baffle 3 erected on the supporting beam 2. The anti-pile slippage baffle 3 is placed on the supporting beam 2 and fixed to the supporting beam 2 by fixing bolts 4. A through hole 33 is opened in the middle of the anti-pile slippage baffle 3, and there is a certain gap between the anti-pile slippage baffle 3 and the wall of the single pile foundation pile 1, which together form a gap portion. When pile slippage occurs, the pile slippage baffle 3 contacts the seawater, and the seawater and the pile slippage baffle 3 interact with each other, and a part of the seawater passes through the gap portion. Since the seawater is blocked by the main support plate 31 and the graded baffle group 32, the seawater will produce huge resistance to the single pile foundation 1, thereby preventing further pile slippage and preventing excessive pile slippage from occurring in the single pile foundation 1.

[0028] The present invention forms a modular anti-over-slip pile platform through the combination of the circumferentially distributed supporting beams 2 and the detachable anti-slip pile baffles 3, and the resistance area can be flexibly adjusted at different construction stages. The radial strip plate design of the main support plate 2 realizes uniform load distribution, and the end support 311 and the supporting beam 2 form a bidirectional force system to improve the stability of the device. The resistance is formed by the multi-layer arrangement of the graded baffle group 32, and the drainage volume can be controlled in conjunction with the gap part, so that a dynamic balance with adjustable resistance and controllable drainage can be achieved during the construction process. The present invention not only ensures the necessary water flow to avoid negative pressure on the single pile foundation pile 1 through the gap part, but also generates eddy resistance through the graded baffle group 32 and the supporting beam 2 to reduce the kinetic energy of the pile. The anti-over-slip pile platform of the present invention is built into the single pile foundation 1 to avoid the risk of external attached devices being impacted by ocean currents, and is suitable for the construction scene of the offshore single pile foundation 1.

[0029] In some embodiments, the supporting beam 2 of the present invention is in the shape of a channel steel as a whole, with an opening facing upward. The opening-up structure facilitates the plug-in installation of the anti-slip pile baffle 3, forming a self-locking connection interface. The supporting beam 2 is welded uniformly on the single pile foundation 1 in the circumferential direction. Specifically, the supporting beams 2 can be distributed in 4 to 16 pieces, and the specific number can be determined according to the geometric dimensions and stress conditions of the single pile foundation 1, so as to achieve an optimal balance between bearing capacity and material cost. The trough-shaped supporting beam 2 forms a closed stress-bearing section, and the bending stiffness is improved to meet the impact requirements of large-tonnage pile hammers.

[0030] Furthermore, the main support plate 31 of the present invention is radially shaped, and the main support plate 31 is welded with an end support 321 near the end. The end support 312 is placed on the supporting beam 2 and connected to the supporting beam 2 through the fixing bolt 4. The rigid connection between the end support 312 of the present invention and the supporting beam 2 forms a three-point support structure, which converts the concentrated load into a distributed load and reduces the risk of stress concentration. When the present invention is connected with a high-strength fixing bolt 4, reliable fixation under pre-tightening torque can be achieved to resist loosening caused by construction vibration.

[0031] In some embodiments, the number of arc baffles 321 of the present invention can be determined according to the possibility of pile slippage at the position. If the possibility of pile slippage at the position is high, more arc baffles 321 can be added to increase water resistance. If the possibility of pile slippage at the position is low, fewer arc baffles 321 can be added. Based on geological survey data, the present invention can dynamically adjust the number of arc baffles 321 to achieve precise prevention and control. Through the modular increase and decrease of arc baffles 321, the reusable device for preventing excessive slippage of offshore single pile foundation has a better reuse rate, controls costs, and has certain practical significance.

[0032] The gap portion of the present invention includes a through hole 33 provided in the middle of the main support plate 31 and a water flow area formed along the axial direction of the anti-over-slip pile platform. The through hole 33 in the center of the present invention forms the main drainage channel, and cooperates with the axial water flow area to form a flow area during construction and installation. Further optimized, the edge of the through hole 33 of the present invention can be designed with a diversion section or chamfered corners according to actual needs to optimize the control of water flow.

[0033] Furthermore, several different arc baffles 321 of the present invention are arranged in sequence along the inner wall from the through hole 33 to the monopile foundation 1. The arc baffles 321 of the present invention adopt a gradient radius design to form a stepped installation, and a certain distance is maintained between adjacent arc baffles 321.

[0034] Furthermore, the water passing area includes water passing holes 322 reserved between a plurality of arc-shaped baffles 321 and a gap 34 between the graded baffle group 32 and the single pile foundation 1. The spacing between adjacent arc-shaped baffles 321 of the present invention is the water passing hole 322, and the water passing hole 322 is an arc-shaped hole. Specifically, the sizes of the through hole 33, the water passing hole 322 and the gap 34 of the present invention are designed according to the diameter of the single pile foundation 1 and the requirements of seawater resistance. Through the coordination of the water passing hole 322, the through hole 33 and the gap 34, the necessary seawater flow can be guaranteed during the installation of the reusable device for preventing the over-slipping of the offshore single pile foundation.

[0035] The present invention also provides a method for using a reusable device for preventing excessive slippage of an offshore single pile foundation, comprising the following steps: S1. When manufacturing the monopile foundation 1, a platform for preventing excessive pile slippage is installed simultaneously to form a reusable device for preventing excessive pile slippage of the offshore monopile foundation; S2, installing a reusable device for preventing excessive pile slippage of an offshore single pile foundation during offshore construction. If the single pile foundation 1 slips, the excessive pile slippage prevention platform enters the water to prevent the single pile foundation 1 from sinking; If the single pile foundation 1 does not slip, the anti-excessive slip platform is removed after the installation is completed.

[0036] In some embodiments, when the present invention manufactures the monopile foundation 1 in a steel structure manufacturing plant (onshore), the anti-excessive pile slip platform is installed simultaneously, and then the anti-excessive pile slip platform is installed together with the monopile foundation 1 on the seabed surface 6. During the construction process, if the monopile foundation 1 slips (generally, an upper extension section 7 needs to be formed on the monopile foundation 1), the anti-excessive pile slip platform can prevent a large pile slip after entering the water, ensuring that the monopile top flange is above the water surface 5; if the monopile foundation 1 does not slip, the anti-excessive pile slip platform is located above the water surface, and then the fixing bolts 4 between the anti-slip pile baffle 3 and the supporting beam 2 in the anti-excessive pile slip platform can be removed, and the anti-slip pile baffle 3 is lifted from the upper part of the monopile foundation 1 by a crane, so that the anti-slip pile baffle 3 can be reused. At the same time, due to the modular design of the pile slip baffle 3, the anti-slip pile baffle 3 can be applied to different geological conditions. It is not limited to the sea and has certain applicability.

[0037] In summary. The reusable device for preventing excessive pile slipping of offshore single pile foundations of the present invention and the use method thereof, by designing an anti-excess pile slipping platform, combined with a supporting beam and a detachable anti-pile slipping baffle, achieves effective protection against pile slipping. The device makes the resistance distribution uniform, and can provide targeted protection according to the pile slipping conditions at different depths. In addition, the present invention is easy to adjust according to different construction conditions and requirements. The device is not only convenient to construct, but also environmentally friendly and energy-saving, and reduces the potential risks and costs caused by pile slipping, and can be expected to improve the safety and stability of offshore wind power foundation construction.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A reusable device for preventing excessive slippage of offshore single pile foundations, characterized in that: The invention comprises a monopile foundation (1) and an anti-excessive pile sliding platform detachably arranged on the monopile foundation (1), wherein the anti-excessive pile sliding platform comprises a plurality of supporting beams (2) circumferentially arranged on the inner wall of the monopile foundation (1), and at least one of the supporting beams (2) is detachably provided with an anti-excessive pile sliding baffle (3); The anti-slip pile baffle (3) comprises a main support plate (31) and a plurality of graded baffle groups (32); the main support plate (31) is radially shaped and forms a plurality of strip plates (311) that can be mounted corresponding to the supporting beam (2); at least one of the strip plates (311) is provided with an end support (312); the end support (312) can be arranged on the supporting beam (2); and different graded baffle groups (32) are arranged between adjacent strip plates (311); The anti-excessive pile sliding platform has a gap portion. In the event of pile sliding, the anti-excessive pile sliding platform can allow water to pass through the gap portion and form resistance through the main support plate (31) and the graded baffle plate group (32) so as to prevent the monopile foundation (1) from sinking.

2. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 1 is characterized in that: The supporting beam (2) is a trough-shaped structure with an opening facing upward, and the number of the supporting beams (2) is 4 to 16. The number of the supporting beams (2) is determined according to the geometric dimensions and force requirements of the single pile foundation (1).

3. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 1 is characterized in that: The end support (311) can be fixedly connected to the supporting beam (2).

4. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 1 is characterized in that: The gap portion comprises a through hole (33) arranged in the middle of the main support plate (31) and a water-passing area formed along the axial direction of the anti-over-slip pile platform.

5. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 4 is characterized in that: Each of the graded baffle sets (32) comprises arc-shaped baffles (321) of different sizes, and the arc-shaped baffles (321) of different sizes are arranged in sequence along the inner wall from the through hole (33) to the single pile foundation (1).

6. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 5 is characterized in that: The number of the arc-shaped baffles (321) is adjusted and determined according to the risk level of the pile slipping at the machine position. When the risk level of the pile slipping at the machine position is high, the number of the arc-shaped baffles (321) is increased, and when the risk level of the pile slipping at the machine position is low, the number of the arc-shaped baffles (321) is reduced.

7. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 6 is characterized in that: The water passing area includes water passing holes (322) reserved between adjacent arc-shaped baffles (321) and a gap (34) between the graded baffle group (32) and the single pile foundation (1).

8. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 7 is characterized in that: The sizes of the through hole (33), the water hole (322) and the gap (34) are designed and formulated according to the diameter of the single pile foundation (1) and the requirements of seawater resistance.

9. The reusable device for preventing excessive slippage of offshore single pile foundation according to claim 1, characterized in that: The anti-excessive pile sliding platform is connected to the supporting beam (2) in a detachable manner.

10. A method for using the reusable device for preventing excessive slippage of offshore single pile foundation according to any one of claims 1 to 9, characterized in that: The steps include: S1. When manufacturing the monopile foundation (1), a pile over-slip prevention platform is installed simultaneously to form a reusable device for preventing the monopile foundation from over-slipping at sea; S2. Installing a reusable device for preventing excessive pile slippage of an offshore single pile foundation during offshore construction. If the single pile foundation (1) slips, the excessive pile slippage prevention platform enters the water to prevent the single pile foundation (1) from sinking. If the single pile foundation (1) does not slip, the anti-excessive slip platform will be removed after installation is completed.

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