Offshore wind power foundation pile reinforcing structure and offshore wind power foundation pile reinforcing method

Abstract

The invention discloses an offshore wind power foundation pile reinforcing structure and an offshore wind power foundation pile reinforcing method, and the offshore wind power foundation pile reinforcing structure comprises a reinforcing pile pipe and a dumping structure; a containing space is formed in the reinforcing pile pipe, an opening is formed in the lower end of the reinforcing pile pipe and communicated with the containing space, the reinforcing pile pipe is used for being arranged on a foundation pile in a sleeving mode through the opening and the containing space, a pouring hole is formed in the reinforcing pile pipe, and grouting materials are poured between the outer wall of the foundation pile and the inner wall of the reinforcing pile pipe. The soil discharging structure is arranged at the lower end of the reinforcing pile pipe and connected to the foundation pile, and the soil discharging structure is used for discharging soil at the lower end of the reinforcing pile pipe to the outer side of the reinforcing pile pipe when the reinforcing pile pipe is installed. According to the technical scheme, the structural strength of the offshore wind power foundation pile can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to an offshore wind power foundation pile reinforcement structure and an offshore wind power foundation pile reinforcement method. Background Art

[0002] Old wind turbines have been operating in harsh external environments for a long time and will face the risk of demolition when their service life reaches the end of its service life. This means that the utilization value of wind and land resources will be greatly reduced, and high costs will have to be paid for the demolition and reconstruction of wind farms.

[0003] Foundation piles have become the most widely used foundation type in offshore wind farms at home and abroad due to their simple structure, clear force, good stability and excellent economy. As wind turbines reach the end of their service life and large-capacity units are launched one after another due to industry development, developers often hope to transform and reinforce single pile foundations without dismantling the original single pile foundations to adapt to the expanded large-capacity units, thereby maximizing project benefits.

[0004] Patent CN212270986U proposes an expansion and reinforcement structure for an offshore wind power rock-embedded single pile foundation, which involves a lot of offshore welding operations. The offshore welding of reinforced steel plates is difficult, and the welding quality directly affects the strength and stability of the reinforced single pile. Summary of the invention

[0005] The main purpose of the present invention is to propose an offshore wind power foundation pile reinforcement structure, aiming to improve the structural strength of the offshore wind power foundation pile.

[0006] To achieve the above-mentioned purpose, the offshore wind power foundation pile reinforcement structure proposed by the present invention comprises:

[0007] A reinforced pile pipe is provided with a receiving space inside, an opening is provided at the lower end of the reinforced pile pipe to communicate with the receiving space, the reinforced pile pipe is used to be sleeved on the foundation pile through the opening and the receiving space, the reinforced pile pipe is provided with a pouring hole, and a grouting material is poured between the outer wall of the foundation pile and the inner wall of the reinforced pile pipe; and

[0008] The soil discharge structure is arranged at the lower end of the reinforced pile pipe and connected to the foundation pile. The soil discharge structure is used to discharge the soil at the lower end of the reinforced pile pipe to the outside of the reinforced pile pipe when installing the reinforced pile pipe.

[0009] Optionally, a guide device is further included, the guide device includes a plurality of guide wheels, the plurality of guide wheels are arranged on the inner wall of the reinforced pile pipe, and the rotation axis direction of each guide wheel is perpendicular to the extension direction of the foundation pile.

[0010] Optionally, a steel cage is provided on the inner wall of the reinforced pile pipe.

[0011] Optionally, a flange ring is provided in the reinforced pile pipe, and a mounting portion for cooperating with the flange ring is provided at the top of the foundation pile.

[0012] Optionally, the axes of the foundation pile and the reinforced pile pipe are located in the same straight line, and the distance from the outer wall of the foundation pile to the inner wall of the reinforced pile pipe is between 0.5m and 5m.

[0013] Optionally, the soil discharge structure includes a truncated cone and a sealing ring, wherein the sealing ring is sleeved on the foundation pile, the top end of the truncated cone is connected to the open end of the reinforced pile pipe, and the lower end of the truncated cone is connected to the sealing ring.

[0014] Optionally, grouting material is poured into the truncated cone portion, and the outer wall of the truncated cone portion and the reinforced pile pipe are an integrated structure.

[0015] Optionally, after installation is completed, the bottom end portion of the reinforced pile pipe is not lower than the bottom end portion of the foundation pile.

[0016] The present invention also proposes a method for strengthening offshore wind power foundation piles, comprising the following steps:

[0017] Step 1: providing a reinforced pile pipe, wherein a receiving space is provided inside the reinforced pile pipe, an opening is provided at the lower end of the reinforced pile pipe to communicate with the receiving space, the reinforced pile pipe is provided with a pouring hole, and a soil discharge structure is provided at the lower end of the reinforced pile pipe, wherein the soil discharge structure is used to discharge the soil at the lower end of the reinforced pile pipe to the outside of the reinforced pile pipe;

[0018] Step 2: transporting the reinforced pile pipe to the upper end of the foundation pile to be reinforced, and sleeve the reinforced pile pipe on the foundation pile through the opening and the accommodation space until the lower end of the reinforced pile pipe is inserted to a certain depth below the mud surface;

[0019] Step 3: pouring grouting material into the accommodation space through the pouring hole, so that the grouting material is filled between the outer wall of the foundation pile and the inner wall of the reinforced pile pipe.

[0020] Optionally, a flange ring is provided in the reinforced pile tube, and a mounting portion for cooperating with the flange ring is provided at the top of the foundation pile. Step 4 is performed after step 3: connecting the flange ring to the mounting portion at the top of the foundation pile by threaded fasteners to complete the reinforcement of the foundation pile.

[0021] The technical solution of the present invention is to provide a accommodating space inside the reinforced pile pipe, and to provide an open and connected accommodating space at the lower end of the reinforced pile pipe, and to provide a soil discharge structure at the lower end of the reinforced pile pipe, so that the reinforced pile pipe can be sleeved on the offshore wind power foundation pile through the open and accommodating space, and the soil under the reinforced pile pipe can be discharged through the soil discharge device, so that the reinforced pile pipe can be inserted into the mud surface of the seabed, and the stability of the reinforced pile pipe can be guaranteed. Then, the grouting material can be poured into the accommodating space through the pouring hole, so that the grouting material is filled between the outer wall of the foundation pile and the inner wall of the reinforced pile pipe, and the relative stability of the reinforced pile pipe and the foundation pile is improved. In this way, the reinforced pile pipe is arranged on the periphery of the foundation pile, which increases the radial size of the foundation pile and makes the structure of the foundation pile stronger. In this way, the "large on top and small on the bottom" reinforced single pile structure conforms to the force characteristics and can withstand more loads.

[0022] In addition, when the service life of the original offshore wind power expires, the offshore wind power foundation pile reinforcement structure can be arranged on the original offshore wind power foundation piles to achieve the secondary utilization of the original wind turbine foundation piles, which can save materials and has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 This is a structural schematic diagram of an embodiment of an offshore wind power foundation pile reinforcement structure of the present invention;

[0025] Figure 2 for Figure 1 Cross-section of the middle AA;

[0026] Figure 3 for Figure 1 Cross-section of the middle BB;

[0027] Figure 4 for Figure 1 Cross-section of the middle CC;

[0028] Figure 5 for Figure 1 Cross-section of the middle DD;

[0029] Figure 6 for Figure 1 Cross-section of EE;

[0030] Figure 7 The present invention is a flow chart of an embodiment of a method for reinforcing offshore wind power foundation piles.

[0031] Explanation of the reference numerals: 10, reinforced pile pipe; 11, accommodating space; 12, flange ring; 13, threaded fastener; 14, grouting hole; 15, guide wheel; 16, grouting material; 17, steel cage; 20, earth discharge structure; 21, truncated cone; 22, sealing ring; 30, foundation pile;

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The present invention provides an offshore wind power foundation pile reinforcement structure.

[0037] In the embodiment of the present invention, Figures 1 to 6As shown, the offshore wind power foundation pile reinforcement structure includes a reinforced pile pipe 10 and a soil discharge structure 20; the reinforced pile pipe 10 is provided with a accommodating space 11 inside, and the lower end of the reinforced pile pipe 10 is provided with an open opening connected to the accommodating space 11, and the reinforced pile pipe 10 is used to be sleeved on the foundation pile 30 through the open opening and the accommodating space 11, and the reinforced pile pipe 10 is also provided with a pouring hole 14, and a grouting material 16 is poured between the outer wall of the foundation pile 30 and the inner wall of the reinforced pile pipe 10; the soil discharge structure 20 is arranged at the lower end of the reinforced pile pipe 10 and connected to the foundation pile 30. The soil discharge structure 20 is used to discharge the soil at the lower end of the reinforced pile pipe 10 to the outside of the reinforced pile pipe 10 when installing the reinforced pile pipe 10.

[0038] Specifically, when strengthening the offshore wind power foundation pile, the reinforced pile pipe 10 is first moved to the top of the foundation pile 30 by a crane, and then the reinforced pile pipe 10 is controlled to move downward so that the reinforced pile pipe 10 is sleeved on the foundation pile 30 through the opening and the accommodating space 11. Then, as the reinforced pile pipe 10 moves downward, the soil discharge device will contact the mud surface of the seabed, and then the soil discharge structure 20 will discharge the soil at the lower end of the reinforced pile pipe 10 to the outside of the reinforced pile pipe 10, so that the reinforced pile pipe 10 can continue to move downward until the reinforced pile pipe 10 is inserted to a certain depth of the mud surface, and then the grouting material 16 is poured into the accommodating space 11 through the pouring hole 14, so that the grouting material 16 is filled between the outer wall of the foundation pile 30 and the inner wall of the reinforced pile pipe 10, thereby improving the relative stability of the reinforced pile pipe 10 and the foundation pile 30, so as to complete the structural reinforcement of the offshore wind power foundation pile 30.

[0039] The technical solution of the present invention is to provide a receiving space 11 inside the reinforced pile pipe 10, and to provide an open communicating receiving space 11 at the lower end of the reinforced pile pipe 10, and to provide a soil discharge structure 20 at the lower end of the reinforced pile pipe 10, so that the reinforced pile pipe 10 can be sleeved on the offshore wind power foundation pile 30 through the open opening and the receiving space 11, and the soil under the reinforced pile pipe 10 can be discharged through the soil discharge device, so that the reinforced pile pipe 10 can be inserted into the mud surface of the seabed, and the stability of the reinforced pile pipe 10 can be ensured, and then the receiving space 11 can be poured with grouting material 16 through the pouring hole 14, so that the grouting material 16 is filled between the outer wall of the foundation pile 30 and the inner wall of the reinforced pile pipe 10, and the relative stability of the reinforced pile pipe 10 and the foundation pile 30 is improved. In this way, the reinforced pile pipe 10 is provided on the periphery of the foundation pile 30, the radial dimension of the foundation pile 30 is increased, and the structure of the foundation pile 30 is stronger, so that the "large on top and small on the bottom" reinforced single pile structure meets the force characteristics and can withstand more loads.

[0040] When the service life of the original offshore wind power expires, an offshore wind power foundation pile reinforcement structure can be arranged on the original offshore wind power foundation pile 30 to achieve secondary utilization of the original wind turbine foundation pile 30, which can save materials and has good economy.

[0041] For example, a 3MW wind turbine that is about to be decommissioned has a single pile foundation with a diameter of 5m, a pile length of 50m, and a steel cost of about 3 million yuan. If it needs to be dismantled, each foundation will cost 1.5 million yuan. A new 10MW wind turbine has a single pile foundation with a diameter of 10m, a pile length of 60m, and a steel cost of about 16 million yuan. If this patent solution is adopted, the outer reinforced pile pipe will have a diameter of 9m, a pile length of 48m, and the cost of the main material and related supporting structures will be about 10 million yuan. Compared with the dismantling solution, each wind turbine will save about 7.5 million yuan in material costs and dismantling costs.

[0042] In some embodiments, a guide device is also included, and the guide device includes a plurality of guide wheels 15, and the plurality of guide wheels 15 are arranged on the inner wall of the reinforced pile pipe 10, and the rotation axis direction of each guide wheel 15 is perpendicular to the extension direction of the foundation pile 30. Specifically, when the reinforced pile pipe 10 is being reinforced, the guide wheel 15 abuts against the outer wall of the foundation pile 30, avoiding the wear caused by the contact between the reinforced pile pipe 10 and the foundation pile 30, and also plays a guiding role, ensuring that the reinforced pile pipe 10 can be accurately sleeved on the foundation pile 30, making the relative position of the two more accurate, which is conducive to ensuring that the gap between the two after grouting is uniform, so that the force of the grouting material 16 is more uniform, and the stability of the overall structure is improved.

[0043] In some embodiments, the guide device includes a guide rail and a guide wheel 15, a plurality of guide rails are arranged at intervals on the inner wall of the reinforced pile pipe 10, and all extend in the up-down direction, and a plurality of guide wheels 15 are arranged on the outer wall of the foundation pile 30 and cooperate with the guide rail. Specifically, the guide rail extends in the up-down direction, providing a clear vertical guide for the insertion of the foundation pile 30 into the reinforced pile pipe 10, and the cooperation between the guide wheel 15 and the guide rail enables the foundation pile 30 to move only along the direction of the guide rail during the insertion process, effectively preventing the foundation pile 30 from lateral displacement or shaking during the installation process, so that the reinforced pile pipe 10 can be smoothly and accurately sleeved on the foundation pile 30, thereby improving the accuracy and efficiency of the installation.

[0044] In some embodiments, the inner wall of the reinforced pile pipe 10 is provided with a steel cage 17. Specifically, the steel cage 17 can work in conjunction with the grouting material 16 to greatly improve the overall strength of the connection between the reinforced pile pipe 10 and the foundation pile 30. Moreover, the presence of the steel cage 17 can constrain the deformation of the grouting material 16. When there is a tendency for cracks to appear, the steel cage 17 can prevent the cracks from further expanding through its own tensile strength, thereby improving the anti-crack performance of the structure and ensuring the integrity and stability of the foundation structure.

[0045] In some embodiments, a flange ring 12 is provided in the reinforced pile pipe 10, and a mounting portion for cooperating with the flange ring 12 is provided at the top of the foundation pile 30. Specifically, when the grouting material 16 has not yet solidified, the entire structure is relatively unstable. In this way, the flange ring 12 and the mounting portion are fixed together by a plurality of threaded fasteners 13, so that the foundation pile 30 and the reinforced pile pipe 10 are connected together, which can provide a stable connection frame for the reinforced pile pipe 10 and the foundation pile 30, so that they maintain a relatively fixed position relationship in space, prevent the reinforced pile pipe 10 from shaking, deflecting or tilting under the action of deadweight, external wind force, etc., ensure that the foundation pile 30 and the reinforced pile pipe 10 are in the designed coaxial position, and lay the foundation for the subsequent solidification of the grouting material 16 to form a good overall structure. In addition, when pouring the grouting material 16, the operator can observe whether the bolt holes on the flange ring 12 are overflowing, so as to judge whether the grouting is completed (when the bolt holes on the flange ring 12 are overflowing, it indicates that the grouting is completed). Furthermore, the injection hole 14 is provided on the flange ring 12 , which can avoid the need to process the injection hole 14 structure additionally on the pipe wall of the reinforced pile pipe 10 , and the structure of the reinforced pile pipe 10 is simpler.

[0046] In some embodiments, the axes of the foundation pile 30 and the reinforced pile pipe 10 are located in the same straight line, and the distance from the outer wall of the foundation pile 30 to the inner wall of the reinforced pile pipe 10 is between 0.5m and 5m. Specifically, the axes of the foundation pile 30 and the reinforced pile pipe 10 coincide, which can ensure that the load generated during the operation of offshore wind power can be evenly transmitted along the central axis of the foundation pile 30 and the reinforced pile pipe 10 to avoid eccentric loads. In this way, the various parts of the foundation pile 30 and the reinforced pile pipe 10 can be evenly stressed, giving full play to their bearing capacity and reducing the risk of structural damage caused by local stress concentration. The spacing of 0.5m-5m provides a suitable space for grouting construction. If the spacing is too small, it may make it difficult to fully fill the grouting material 16, forming gaps, affecting the grouting effect and structural integrity; if the spacing is too large, it may cause excessive use of the grouting material 16, and it is not easy to ensure the density of the grouting.

[0047] In some embodiments, the soil discharge structure 20 includes a truncated cone 21 and a sealing ring 22, the sealing ring 22 is sleeved on the foundation pile 30, the top of the truncated cone is connected to the open end of the reinforced pile pipe 10, and the lower end of the truncated cone is connected to the sealing ring 22. Specifically, the shape of the truncated cone 21 is conducive to guiding the soil to be discharged to the outside when installing the reinforced pile pipe 10. As the reinforced pile pipe 10 is pressed down, the truncated cone 21 can guide the soil below to the outside of the reinforced pile pipe 10 along the inclined surface of the truncated cone, avoiding the accumulation of soil at the bottom of the reinforced pile pipe 10, hindering the installation process, and allowing the reinforced pile pipe 10 to sink to the predetermined position more smoothly.

[0048] In some embodiments, grouting material 16 is poured into the truncated cone 21, and the outer wall of the truncated cone 21 is an integrated structure with the reinforced pile pipe 10. Specifically, the sealing between the reinforced pile pipe 10 and the truncated cone 21 is better, and the integrated structure is stronger, and the load of the truncated cone 21 can be better transmitted to the reinforced pile pipe 10, thereby improving the stability of the offshore wind power foundation pile reinforcement structure.

[0049] In some embodiments, after installation, the bottom end of the reinforced pile pipe 10 is not lower than the bottom end of the foundation pile 30. Specifically, during operation, the load borne by the bottom end of the foundation pile 30 is relatively small, so no additional reinforcement structure is required. In this way, the bottom end of the reinforced pile pipe 10 is not lower than the bottom end of the foundation pile 30, which can avoid setting the reinforced pile pipe 10 too long and save costs.

[0050] In some embodiments, the material of the sealing ring 22 is rubber. Specifically, rubber has excellent flexibility and elasticity, and can fit tightly on the surface of the foundation pile 30. Even if there are certain unevenness or shape deviations on the surface of the foundation pile 30, the rubber sealing ring 22 can fully contact it and effectively fill the gap. Moreover, rubber itself has good water resistance. In a humid or even long-term soaking environment on the seabed, it can maintain its physical properties and sealing performance, and is not easily penetrated by water, so as to prevent moisture from entering the space between the reinforced pile pipe 10 and the foundation pile 30, affecting the stability and durability of the structure. In addition, in other embodiments, the material of the sealing ring 22 can also be metal.

[0051] In some embodiments, the reinforced pile pipe 10 and the foundation pile 30 are both made of steel, and a corrosion-resistant coating is applied to the surface of the reinforced pile pipe 10. Specifically, the structures of the reinforced pile pipe 10 and the foundation pile 30 are stronger, and the corrosion resistance of the reinforced pile pipe 10 can be improved.

[0052] The method for strengthening offshore wind power foundation piles proposed by the present invention is as follows: Figure 7 As shown, including:

[0053] S01: Provide a reinforced pile pipe 10, wherein a receiving space 11 is provided inside the reinforced pile pipe 10, an open communicating receiving space 11 is provided at the lower end of the reinforced pile pipe 10, a grouting hole 14 is provided at the reinforced pile pipe 10, and a soil discharge structure 20 is provided at the lower end of the reinforced pile pipe 10, and the soil discharge structure 20 is used to discharge the soil at the lower end of the reinforced pile pipe 10 to the outside of the reinforced pile pipe 10;

[0054] S02: transporting the reinforced pile pipe 10 to the upper end of the foundation pile 30 to be reinforced, and sleeve the reinforced pile pipe 10 on the foundation pile 30 through the open opening and the accommodating space 11 until the lower end of the reinforced pile pipe 10 is inserted to a certain depth below the mud surface;

[0055] S03 : pouring the grouting material 16 into the accommodation space 11 through the pouring hole 14 , so that the grouting material 16 is filled between the outer wall of the foundation pile 30 and the inner wall of the reinforced pile pipe 10 .

[0056] Specifically, the reinforced pile pipe 10 is sleeved on the foundation pile 30, and the reinforced pile pipe 10 is inserted to a certain depth below the mud surface, and grouting material 16 is poured between the foundation pile 30 and the reinforced pile pipe 10. After the grouting material 16 solidifies, the foundation pile 30 and the reinforced pile pipe 10 are fixed together. After the structure of the foundation pile 30 is strengthened, the bearing capacity of the foundation pile 30 is improved, so that it can withstand more loads, meeting the higher requirements of offshore wind power for foundation stability in complex marine environments.

[0057] In some embodiments, a flange ring 12 is provided in the reinforced pile pipe 10, and a mounting portion for cooperating with the flange ring 12 is provided at the top of the foundation pile 30. After step S03, step S04 is performed:

[0058] The flange ring 12 is connected to the mounting portion at the top of the foundation pile 30 by means of the threaded fasteners 13 , so as to complete the reinforcement of the foundation pile 30 .

[0059] Specifically, when the grouting material 16 has not yet solidified, the entire structure is relatively unstable. In this way, the flange ring 12 and the mounting portion are fixed together by multiple threaded fasteners 13, thereby connecting the foundation pile 30 and the reinforced pile pipe 10 together. This can provide a stable connection frame for the reinforced pile pipe 10 and the foundation pile 30, so that they maintain a relatively fixed positional relationship in space, prevent the reinforced pile pipe 10 from shaking, deviating or tilting under the action of its own weight, external wind force, etc., ensure that the foundation pile 30 and the reinforced pile pipe 10 are in the designed coaxial position, and lay the foundation for the subsequent solidification of the grouting material 16 to form a good overall structure.

[0060] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An offshore wind power foundation pile reinforcement structure, characterized in that: include: A reinforced pile pipe is provided with a receiving space inside, an opening is provided at the lower end of the reinforced pile pipe to communicate with the receiving space, the reinforced pile pipe is used to be sleeved on the foundation pile through the opening and the receiving space, the reinforced pile pipe is provided with a pouring hole, and a grouting material is poured between the outer wall of the foundation pile and the inner wall of the reinforced pile pipe; and The soil discharge structure is arranged at the lower end of the reinforced pile pipe and connected to the foundation pile. The soil discharge structure is used to discharge the soil at the lower end of the reinforced pile pipe to the outside of the reinforced pile pipe when installing the reinforced pile pipe.

2. The offshore wind power foundation pile reinforcement structure according to claim 1, characterized in that: It also includes a guide device, which includes a plurality of guide wheels. The plurality of guide wheels are arranged on the inner wall of the reinforced pile pipe, and the rotation axis direction of each guide wheel is perpendicular to the extension direction of the foundation pile.

3. The offshore wind power foundation pile reinforcement structure according to claim 1, characterized in that: The inner wall of the reinforced pile pipe is provided with a steel cage.

4. The offshore wind power foundation pile reinforcement structure according to claim 1, characterized in that: A flange ring is arranged inside the reinforced pile pipe, and a mounting portion for cooperating with the flange ring is arranged at the top of the foundation pile.

5. The offshore wind power foundation pile reinforcement structure according to claim 1, characterized in that: The axes of the foundation pile and the reinforced pile pipe are located in the same straight line, and the distance from the outer wall of the foundation pile to the inner wall of the reinforced pile pipe is between 0.5m and 5m.

6. The offshore wind power foundation pile reinforcement structure according to claim 1, characterized in that: The soil discharge structure comprises a truncated cone and a sealing ring, wherein the sealing ring is sleeved on the foundation pile, the top end of the truncated cone is connected to the open end of the reinforced pile pipe, and the lower end of the truncated cone is connected to the sealing ring.

7. The offshore wind power foundation pile reinforcement structure according to claim 6, characterized in that: The truncated cone portion is filled with grouting material, and the outer wall of the truncated cone portion and the reinforced pile pipe are an integrated structure.

8. The offshore wind power foundation pile reinforcement structure according to claim 1, characterized in that: After installation is completed, the bottom end portion of the reinforced pile pipe is not lower than the bottom end portion of the foundation pile.

9. A method for strengthening offshore wind power foundation piles, characterized in that: The following steps are involved: Provided is a reinforced pile pipe, wherein a receiving space is provided inside the reinforced pile pipe, an opening is provided at the lower end of the reinforced pile pipe to communicate with the receiving space, the reinforced pile pipe is provided with a pouring hole, and a soil discharge structure is provided at the lower end of the reinforced pile pipe, wherein the soil discharge structure is used to discharge the soil at the lower end of the reinforced pile pipe to the outside of the reinforced pile pipe; The reinforced pile pipe is transported to the upper end of the foundation pile that needs to be reinforced, and the reinforced pile pipe is sleeved on the foundation pile through the opening and the accommodation space until the lower end of the reinforced pile pipe is inserted to a certain depth below the mud surface; The grouting material is poured into the accommodating space through the pouring hole, so that the grouting material is filled between the outer wall of the foundation pile and the inner wall of the reinforced pile pipe.

10. The offshore wind power foundation pile reinforcement method according to claim 9, characterized in that: A flange ring is provided inside the reinforced pile pipe, and a mounting portion for cooperating with the flange ring is provided at the top of the foundation pile. After the grouting material is filled between the outer wall of the foundation pile and the inner wall of the reinforced pile pipe, step S04 is performed: The flange ring is connected to the mounting portion at the top of the foundation pile by means of threaded fasteners to complete the reinforcement of the foundation pile.

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