Grouting Reinforcement Connection Structure and Construction Method of Jacket Foundation

Abstract

The application relates to a jacket foundation grouting reinforcement connecting structure and a construction method thereof. The application is suitable for the offshore wind power technical field. The application aims to provide a jacket foundation grouting reinforcement connecting structure and a construction method thereof. The technical scheme comprises the following steps: a steel pipe pile is internally provided with a plugging assembly, so that a cylindrical grouting area is formed in the steel pipe pile; a jacket leg is inlaid in the steel pipe pile or is externally sleeved on the steel pipe pile; the jacket leg is connected with the end of the steel pipe pile through a jacket support assembly, so that the jacket leg can plug the end of the steel pipe pile; a grouting packer is arranged between the steel pipe pile and the jacket leg, so that an overlapping part between the steel pipe pile and the jacket leg forms an annular grouting area; a first grouting pipe is connected to the annular grouting area, and the first grouting pipe is used for injecting high-strength grouting material into the annular grouting area; and a second grouting pipe is connected to the cylindrical grouting area, and the second grouting pipe is used for injecting ordinary grouting material into the cylindrical grouting area.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, and in particular to a grouting reinforcement connection structure for jacket foundations and its construction method. Background Technology

[0002] Achieving carbon peaking and carbon neutrality requires the development of clean energy, especially the widespread application of renewable energy. Offshore wind power, as an important component of clean energy, has enormous development potential.

[0003] With the vigorous development of nearshore wind power, future development will inevitably extend to deep-sea areas. Floating wind turbine foundations are relatively expensive, while jacket foundations have a wider range of applications due to their better adaptability to water depth. However, with increasing water depth and the increase in single-unit wind turbine capacity, the load on each leg of the jacket foundation is becoming increasingly greater. Currently, the commonly used 120MPa grouting material is already considered a top-tier material. To further enhance the mechanical properties of the grouting material, fibers need to be added, but this increases the risk of grout blockage. As the load increases, the traditional high-strength grouting material used between the jacket foundation and the steel pipe piles is no longer sufficient. Simultaneously, with increasing water depth, underwater welding becomes increasingly difficult, necessitating other reinforcement measures to increase the reliable connection between the jacket foundation and the steel pipe piles and ensure effective force transmission. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a grouting reinforcement connection structure for jacket foundation and its construction method, in view of the above-mentioned problems.

[0005] The technical solution adopted in this invention is: a grouting reinforcement connection structure for a jacket foundation, characterized in that it includes:

[0006] The steel pipe pile has an internal sealing component, which forms a columnar grouting zone inside the steel pipe pile.

[0007] The jacket support leg is embedded inside the steel pipe pile or sleeved outside the steel pipe pile. The jacket support leg is connected to the end of the steel pipe pile via the jacket support assembly, so that the jacket support leg can seal the end of the steel pipe pile.

[0008] A grouting packer is installed between the steel pipe pile and the guide frame leg, so that the overlapping part between the two forms an annular grouting zone;

[0009] A first grouting pipe leads to the annular grouting area, and the first grouting pipe is used to inject high-strength grouting material into the annular grouting area;

[0010] The second grouting pipe leads to the cylindrical grouting area and is used to inject ordinary grouting material into the cylindrical grouting area.

[0011] Through the above-mentioned technical means, the jacket legs and steel pipe piles are connected by an embedded or outer sleeve. The overlapping part of the connection forms an annular grouting zone, and the steel pipe pile forms a columnar grouting zone. High-strength grout is injected into the annular grouting zone, and ordinary grout is injected into the columnar grouting zone, thereby forming double grouting at the connection between the jacket legs and the steel pipe piles to improve the structural strength of the connection.

[0012] In some embodiments, the jacket support assembly includes a jacket support plate, a jacket reinforcement plate, and a sealing plate. For example, if the jacket leg is embedded inside the steel pipe pile, the jacket support plate is circumferentially connected to the outer wall of the jacket leg, the jacket support plate connects to and seals the end of the steel pipe pile, the jacket reinforcement plate is circumferentially spaced between the outer wall of the jacket leg and the jacket support plate, and the end of the jacket leg located inside the steel pipe pile is sealed by the sealing plate.

[0013] If the jacket leg of the jacket is fitted over the outside of the steel pipe pile, the inner wall of the jacket leg is connected to the jacket support plate, the jacket support plate is connected to and seals the end of the steel pipe pile, and the jacket reinforcing plate is provided circumferentially between the inner wall of the jacket leg and the jacket support plate.

[0014] In some embodiments, a guide component is further included, which is disposed within the cylindrical grouting zone and is used to provide grouting guidance for the second grouting pipe.

[0015] In some embodiments, the guiding assembly includes a guide tube, one end of which is connected to the guide frame support assembly, and the other end of which is connected to the sealing assembly. The second grouting pipe is arranged inside the guide frame leg, and the end of the second grouting pipe passes through the guide frame support assembly and extends into the guide tube until the end of the second grouting pipe passes through the side wall of the guide tube and is introduced into the columnar grouting area.

[0016] In some embodiments, the guiding assembly further includes a guiding reinforcement plate disposed between the sidewall of the guiding tube and the sealing assembly.

[0017] In some embodiments, the sealing assembly includes a grouting sealing plate and a guide sealing plate, wherein the inner wall of the steel pipe pile is welded with the annular grouting sealing plate, and the guide sealing plate is connected to the center of the grouting sealing plate.

[0018] In some embodiments, a sealing rubber is provided at the connection between the grouting sealing plate and the guide sealing plate, and the size and compression deformation of the sealing rubber should meet the deviations caused by pile driving and manufacturing.

[0019] In some embodiments, a plurality of shear keys are arranged within the annular grouting zone.

[0020] In some embodiments, multiple reinforcing bars are arranged along the axial direction of the steel pipe pile within the columnar grouting zone.

[0021] Another technical solution adopted in this invention is: a construction method for a grouting reinforcement connection structure for a jacket foundation, comprising the following steps:

[0022] S1. First, determine the connection form between the jacket support legs and the steel pipe piles. If the geological conditions are poor and the bearing capacity requirement of the jacket foundation piles is high, then the mode of embedding the jacket support legs into the steel pipe piles is adopted. If the geological conditions are good and the bearing capacity of the jacket foundation piles is easily met, then the mode of wrapping the jacket support legs around the steel pipe piles is adopted.

[0023] S2. When manufacturing steel pipe piles, the grouting sealing plate and reinforcing steel bars are welded inside. When driving the piles, ensure that the steel pipe piles and the grouting sealing plate are installed together.

[0024] S3. Hoist the upper guide frame and embed or sleeve its guide frame legs into the steel pipe pile. At the connection between the guide frame legs and the top of the steel pipe pile, pre-install guide frame support plates and support reinforcement plates so that the guide frame can support its own weight before grouting.

[0025] S4. Pre-install grouting packers on the legs of the guide frame for grouting and sealing. Pre-install the first grouting pipe on the legs of the guide frame. After the guide frame is lowered into place and leveled, high-strength grouting material is injected through the first grouting pipe.

[0026] S5. A guide sealing plate is installed inside the steel pipe pile to cooperate with the grouting sealing plate for sealing. A guide pipe is installed inside the steel pipe pile, and a second grouting pipe is arranged inside the guide pipe. After the high-strength grouting material is completed, ordinary grouting material is injected through the second grouting pipe.

[0027] The beneficial effects of this invention are:

[0028] 1. Based on geological conditions and the bearing capacity requirements of the jacket foundation piles, an embedded or outer sleeve connection is selected between the jacket legs and the steel pipe piles. A ring-shaped grouting zone is formed between the jacket legs and the steel pipe piles, into which high-strength grout is injected. At the connection point between the jacket legs and the steel pipe piles, a columnar grouting zone is formed inside the steel pipe piles, into which ordinary grout is injected. This creates a double-layer grouting at the connection point, enhancing the reliability of the connection and ensuring its force transmission performance. Simultaneously, the double-layer grouting increases the overall rigidity of the foundation and reduces the deformation of the foundation mud surface. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the connection structure in which the guide frame legs are embedded in the steel pipe pile in this application.

[0030] Figure 2 This is a schematic diagram of the connection structure of the jacket leg of the guide frame to the steel pipe pile in this application.

[0031] Figure 3 yes Figure 1 Cross-sectional view.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Jacket support leg; 2. Steel pipe pile; 3. Grouting packer; 4. First grouting pipe; 5. Second grouting pipe; 6. Jacket support plate; 7. Jacket reinforcing plate; 8. Sealing plate; 9. Guide pipe; 10. Guide reinforcing plate; 11. Grouting bottom sealing plate; 12. Guide bottom sealing plate; 13. Sealing rubber; 14. Shear key; 15. Reinforcing steel bar; 16. High-strength grouting material; 17. Ordinary grouting material.

[0034] This specification includes references to "one embodiment" or "implementation". The use of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.

[0035] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps.

[0036] "First," "second," etc. As used in this article, these terms serve as labels for the nouns preceding them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.). Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0038] Example 1:

[0039] Combination Figures 1 to 3As shown, this embodiment is a grouting reinforcement connection structure for a jacket foundation, including a steel pipe pile 2, jacket support legs 1, a grouting sealer 3, a first grouting pipe 4, and a second grouting pipe 5. The jacket support legs 1 are embedded inside the steel pipe pile 2 or are sleeved outside the steel pipe pile 2. The jacket support legs 1 are connected to the end of the steel pipe pile 2 via a jacket support assembly, allowing the jacket support legs 1 to seal the end of the steel pipe pile 2. A sealing assembly is provided inside the steel pipe pile 2, and the sealing assembly cooperates with the jacket support assembly to form a columnar grouting zone inside the steel pipe pile 2. A grouting sealer 3 is provided between the steel pipe pile 2 and the jacket support legs 1, so that the overlapping part between the two forms an annular grouting zone. The first grouting pipe 4 leads to the annular grouting zone and is used to inject high-strength grout 16 into the annular grouting zone. The second grouting pipe 5 leads to the columnar grouting zone and is used to inject ordinary grout 17 into the columnar grouting zone.

[0040] In some implementation schemes, such as Figure 1 and Figure 3 As shown, when the connection method of the jacket support leg 1 being embedded inside the steel pipe pile 2 is adopted, the jacket support assembly includes a jacket support plate 6, a jacket reinforcing plate 7, and a sealing plate 8. The jacket support plate 6 is circumferentially connected to the outer wall of the jacket support leg 1. The jacket support plate 6 connects to and seals the outer edge of the end of the steel pipe pile 2. The jacket reinforcing plate 7 is circumferentially spaced between the outer wall of the jacket support leg 1 and the jacket support plate 6. The end of the jacket support leg 1 located inside the steel pipe pile 2 is sealed by the sealing plate 8. Through the cooperation of the jacket support plate 6 and the grouting packer 3, an annular grouting zone is formed between the outer wall of the jacket support leg 1 and the inner wall of the steel pipe pile 2.

[0041] Furthermore, multiple shear keys 14 are arranged within the annular grouting zone, which can improve the overall integrity and shear resistance of the structure. The first grouting pipe 4 is arranged inside the jacket support leg 1, and the end of the first grouting pipe 4 penetrates the side wall of the jacket support leg 1 and enters the annular grouting zone, thereby allowing high-strength grout 16 to be injected into the annular grouting zone using the first grouting pipe 4.

[0042] Furthermore, the sealing assembly includes a grouting sealing plate 11 and a guide sealing plate 12. The inner wall of the steel pipe pile 2 is welded with a ring-shaped grouting sealing plate 11, and the guide sealing plate 12 is connected to the center of the grouting sealing plate 11. Specifically, a sealing rubber 13 is provided at the connection between the grouting sealing plate 11 and the guide sealing plate 12. The dimensions and compression deformation of the sealing rubber 13 should meet the deviations caused by pile driving and manufacturing. Through the cooperation of the grouting sealing plate 11, the guide sealing plate 12, the sealing plate 8, and the grouting packer 3, a columnar grouting zone is formed inside the steel pipe pile 2.

[0043] Furthermore, a guiding assembly is also provided within the columnar grouting zone to provide grouting guidance for the second grouting pipe 5. The guiding assembly includes a guide pipe 9, one end of which is connected to a sealing plate 8, and the other end of which is connected to a guide sealing plate 12. The second grouting pipe 5 is arranged inside the guide frame leg 1, with its end penetrating the sealing plate 8 and extending into the guide pipe 9 until it penetrates the side wall of the guide pipe 9 and enters the columnar grouting zone. Thus, ordinary grouting material 17 can be injected into the columnar grouting zone using the second grouting pipe 5.

[0044] Furthermore, the guiding assembly also includes a guiding reinforcing plate 10, which is connected to the outer wall of the guiding pipe 9. The two ends of the guiding reinforcing plate 10 are respectively connected to the sealing plate 8 and the guiding bottom sealing plate 12. Multiple reinforcing steel bars 15 are arranged along the axial direction of the steel pipe pile 2 in the columnar grouting zone. Some of the reinforcing steel bars 15 are pre-welded to the sealing plate 8 as a whole, and some of the reinforcing steel bars 15 are pre-welded to the grouting bottom sealing plate 11 as a whole, thereby increasing the connection performance between the ordinary grouting material 17 and the sealing plate 8 and the grouting bottom sealing plate 11.

[0045] In some implementation schemes, such as Figure 2 As shown, when the connection method of the jacket leg 1 being sleeved on the outside of the steel pipe pile 2 is adopted, the jacket support assembly includes a jacket support plate 6 and a jacket reinforcing plate 7. The inner wall of the jacket leg 1 is connected to the jacket support plate 6, and the jacket support plate 6 connects to and seals the end of the steel pipe pile 2. The jacket reinforcing plate 7 is provided circumferentially between the inner wall of the jacket leg 1 and the jacket support plate 6. Through the cooperation of the jacket support plate 6 and the grouting packer 3, an annular grouting zone is formed between the inner wall of the jacket leg 1 and the outer wall of the steel pipe pile 2.

[0046] Furthermore, multiple shear keys 14 are arranged within the annular grouting zone, which can improve the overall integrity and shear resistance of the structure. The first grouting pipe 4 is arranged outside the jacket support leg 1, and the end of the first grouting pipe 4 penetrates the side wall of the jacket support leg 1 and enters the annular grouting zone, thereby allowing high-strength grout 16 to be injected into the annular grouting zone using the first grouting pipe 4.

[0047] Furthermore, the sealing assembly includes a grouting sealing plate 11 and a guide sealing plate 12. The inner wall of the steel pipe pile 2 is welded with a ring-shaped grouting sealing plate 11, and the guide sealing plate 12 is connected to the center of the grouting sealing plate 11. Specifically, a sealing rubber 13 is provided at the connection between the grouting sealing plate 11 and the guide sealing plate 12. The dimensions and compression deformation of the sealing rubber 13 should meet the deviations caused by pile driving and manufacturing. Through the cooperation of the grouting sealing plate 11, the guide sealing plate 12, the sealing plate 8, and the grouting packer 3, a columnar grouting zone is formed inside the steel pipe pile 2.

[0048] Furthermore, a guiding assembly is also provided within the columnar grouting zone to provide grouting guidance for the second grouting pipe 5. The guiding assembly includes a guide pipe 9, one end of which is connected to the guide frame support plate 6, and the other end of which is connected to the guide sealing plate 12. The second grouting pipe 5 is arranged inside the guide frame leg 1, and its end penetrates the guide frame support plate 6 and extends into the guide pipe 9 until the end of the second grouting pipe 5 penetrates the side wall of the guide pipe 9 and is introduced into the columnar grouting zone, thereby enabling the injection of ordinary grouting material 17 into the columnar grouting zone using the second grouting pipe 5.

[0049] Furthermore, the guiding assembly also includes a guiding reinforcing plate 10, which is connected to the outer wall of the guiding tube 9, and the end of the guiding reinforcing plate 10 is connected to the guiding sealing plate 12. Multiple reinforcing bars 15 are arranged along the axial direction of the steel pipe pile 2 within the columnar grouting zone.

[0050] The implementation principle of a grouting reinforcement connection structure for a jacket foundation is as follows:

[0051] In this embodiment, the connection structure between the jacket support leg 1 and the steel pipe pile 2 adopts a double-grouting technology. Depending on different geological conditions, an embedded or outer sleeve connection can be selected. The annular space formed by the gap between the jacket support leg 1 and the steel pipe pile 2 is called the annular grouting zone. High-strength grouting material 16 is injected into the annular grouting zone. This grouting material has high strength and durability, can effectively fill the gap, and improve the shear resistance and overall stiffness of the connection.

[0052] Then, a columnar space, namely a columnar grouting zone, is formed inside the steel pipe pile 2 near the jacket support leg 1. Ordinary grout 17 is injected into the columnar grouting zone to provide internal support, further enhancing the stability and force transmission performance of the connection. Through the formation of double grouting, the connection strength between the jacket support leg 1 and the steel pipe pile 2 is enhanced, and the overall load-bearing capacity of the structure is improved. This effectively reduces the settlement and deformation of the foundation at the mud surface, thereby ensuring the safety and long-term stability of the structure.

[0053] Meanwhile, if a single-stage grouting technique uses higher-strength grouting materials (such as adding fibers), it may increase the risk of pipe blockage. However, double-stage grouting, by using different materials in different areas, can reduce construction difficulties caused by material characteristics while ensuring strength.

[0054] Example 2:

[0055] This embodiment describes a construction method for a grouting reinforcement connection structure for a jacket foundation, including the following steps:

[0056] S1. First, determine the connection form between the jacket support leg 1 and the steel pipe pile 2. If the geological conditions are poor and the bearing capacity requirement of the jacket foundation pile is high, then the mode of embedding the jacket support leg 1 into the steel pipe pile 2 is adopted. If the geological conditions are good and the bearing capacity of the jacket foundation pile is easily met, then the mode of wrapping the jacket support leg 1 around the steel pipe pile 2 is adopted.

[0057] S2. When manufacturing steel pipe pile 2, the grouting sealing plate 11 and reinforcing steel bar 15 are welded inside. When driving the pile, ensure that the steel pipe pile 2 and the grouting sealing plate 11 are installed together.

[0058] S3. Hoist the upper guide frame and embed or sleeve its guide frame legs 1 into or onto the steel pipe pile 2. At the connection between the guide frame legs 1 and the top of the steel pipe pile 2, pre-install the guide frame support plate 6 and the support reinforcement plate so that the guide frame can support its own weight before grouting.

[0059] S3.1 At the connection between the jacket support leg 1 and the steel pipe pile 2, a shear key 14 is installed to enhance the connection and force transmission performance between the subsequent high-strength grouting material 16 and the two.

[0060] S4. A grouting packer 3 is pre-installed on the guide frame leg 1 for grouting and sealing. A first grouting pipe 4 is pre-installed on the guide frame leg 1. After the guide frame is lowered into place and leveled, the high-strength grouting material 16 is injected through the first grouting pipe 4.

[0061] S5. A guide sealing plate 12 is installed inside the steel pipe pile 2 to cooperate with the grouting sealing plate 11 for sealing. A guide pipe 9 is installed inside the steel pipe pile 2, and a second grouting pipe 5 is arranged inside the guide pipe 9. After the high-strength grouting material 16 is grouted, the ordinary grouting material 17 is injected through the second grouting pipe 5.

[0062] S5.1 If the connection method of the guide frame leg 1 being embedded in the steel pipe pile 2 is adopted, a sealing plate 8 is set at the bottom of the guide frame leg 1, a guide pipe 9 is welded to the center of the sealing plate 8, the bottom of the guide pipe 9 is connected to the guide sealing plate 12, and a guide reinforcing plate 10 is used to enhance the connection between the steel pipe pile 2 and the guide frame leg 1. Then, reinforcing steel bars 15 are set on the grouting sealing plate 11 and the sealing plate 8. After the high-strength grouting is completed, the grouting construction of ordinary grouting material 17 is carried out.

[0063] S5.2 If the connection method of the jacket leg 1 being sleeved on the steel pipe pile 2 is adopted, the top of the guide pipe 9 is welded to the jacket support plate 6, the bottom of the guide pipe 9 is connected to the guide sealing plate 12, and the guide reinforcing plate 10 is used to enhance the overall load-bearing capacity. To further increase the connectivity between the steel pipe pile 2 and the jacket leg 1, a second grouting pipe 5 is set at the center of the jacket support plate 6 and the guide pipe 9, and reinforcing steel bars 15 are set on the grouting sealing plate 11 and the jacket support plate 6. After the high-strength grouting is completed, the ordinary grouting material 17 is grouted using the second grouting pipe 5.

[0064] S5.3 To prevent leakage of ordinary grout 17, a sealing rubber 13 is installed between the guide sealing plate 12 and the grouting sealing plate 11. The size and compression deformation of the sealing rubber 13 should meet the deviations caused by pile driving deviation and manufacturing deviation.

[0065] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A jacket foundation grouted reinforcement connection structure, characterized by, The utility model relates to a steel pipe pile (2) internally provided with a plugging assembly, so that a cylindrical grouting area is formed inside the steel pipe pile (2); a jacket leg (1) is embedded inside the steel pipe pile (2) or is sleeved outside the steel pipe pile (2), the jacket leg (1) is connected with the end of the steel pipe pile (2) through a jacket support assembly, so that the jacket leg (1) can plug the end of the steel pipe pile (2); a grouting packer (3) is arranged between the steel pipe pile (2) and the jacket leg (1), so that the overlapping part between the two forms an annular grouting area; a first grouting pipe (4) leads to the annular grouting area, and the first grouting pipe (4) is used for injecting high-strength grouting material (16) into the annular grouting area; a second grouting pipe (5) leads to the cylindrical grouting area, and the second grouting pipe (5) is used for injecting ordinary grouting material (17) into the cylindrical grouting area; the jacket support assembly comprises a jacket support plate (6), a jacket reinforcing plate (7) and a plugging plate (8); if the jacket leg (1) is embedded inside the steel pipe pile (2), the outer wall of the jacket leg (1) is connected with the jacket support plate (6) in a ring shape, the jacket support plate (6) is connected with and plugs the end of the steel pipe pile (2), the jacket reinforcing plate (7) is arranged between the outer wall of the jacket leg (1) and the jacket support plate (6) in a ring shape, and the end of the jacket leg (1) located inside the steel pipe pile (2) is plugged through the plugging plate (8); if the jacket leg (1) is sleeved outside the steel pipe pile (2), the inner wall of the jacket leg (1) is connected with the jacket support plate (6), the jacket support plate (6) is connected with and plugs the end of the steel pipe pile (2), and the jacket reinforcing plate (7) is arranged between the inner wall of the jacket leg (1) and the jacket support plate (6) in a ring shape; the utility model further comprises a guide assembly arranged inside the cylindrical grouting area, and the guide assembly is used for guiding the second grouting pipe (5) to inject grouting material. The guide assembly comprises a guide pipe (9), one end of the guide pipe (9) is connected with the jacket support assembly, the other end of the guide pipe (9) is connected with the plugging assembly, the second grouting pipe (5) is arranged inside the jacket leg (1), the end of the second grouting pipe (5) penetrates the jacket support assembly and extends into the guide pipe (9), until the end of the second grouting pipe (5) penetrates the side wall of the guide pipe (9) and is introduced into the cylindrical grouting area. The guide assembly further comprises a guide reinforcing plate (10) arranged between the side wall of the guide pipe (9) and the plugging assembly. The plugging assembly comprises a grouting bottom plate (11) and a guide bottom plate (12), the inner wall of the steel pipe pile (2) is welded with the annular grouting bottom plate (11), and the center of the grouting bottom plate (11) is connected with the guide bottom plate (12). ​ ​ ​ ​ ​ 2. A jacket foundation grouted reinforcement connection structure according to claim 1, characterized in that: ​ 3. A jacket foundation grouted reinforcement connection structure according to claim 2, wherein: ​ 4. The jacket foundation grouted reinforced connection structure of claim 1, wherein: ​ 5. A jacket foundation grouted reinforcement connection structure according to claim 4, wherein: The connecting part of the grouting bottom sealing plate (11) and the guide bottom sealing plate (12) is provided with a sealing rubber (13), and the size and compression deformation of the sealing rubber (13) should meet the deviation caused by pile sinking and production.

6. A jacket foundation grouted reinforcement connection structure according to claim 1, characterized in that: A plurality of shear keys (14) are arranged in the annular grouting area.

7. The jacket foundation grouted reinforced connection structure of claim 1, wherein: A plurality of reinforcing steel bars (15) are arranged in the cylindrical grouting area along the axial direction of the steel pipe pile (2).

8. The construction method of the grouting reinforced connection structure of the jacket foundation according to any one of claims 1-7, comprising the following steps: S1, first determine the connection form of the jacket leg (1) and the steel pipe pile (2), if the geological condition is poor and the bearing capacity of the jacket foundation pile is required to be high, the jacket leg (1) is embedded in the steel pipe pile (2), if the geological condition is good and the bearing capacity of the jacket foundation pile is easy to meet, the jacket leg (1) is sleeved on the steel pipe pile (2); S2, when the steel pipe pile (2) is produced, the grouting bottom sealing plate (11) and the reinforcing steel bar (15) are welded inside, and when the pile is sunk, the steel pipe pile (2) is ensured to be constructed in place together with the grouting bottom sealing plate (11); S3, hoist the upper jacket, embed or sleeve the jacket leg (1) in or on the steel pipe pile (2), and pre-set the jacket support plate (6) and the jacket reinforcing plate (7) at the connecting part of the jacket leg (1) and the steel pipe pile (2), so that the jacket can support its own weight before grouting; S4, pre-set the grouting packer (3) on the jacket leg (1) for grouting sealing, pre-set the first grouting pipe (4) on the jacket leg (1), and after the jacket is placed in position and leveled, high-strength grouting material (16) is injected through the first grouting pipe (4); S5, set the guide bottom sealing plate (12) in the steel pipe pile (2) to cooperate with the grouting bottom sealing plate (11) for sealing, set the guide pipe (9) in the steel pipe pile (2), arrange the second grouting pipe (5) in the guide pipe (9), and after the high-strength grouting material (16) is grouted, ordinary grouting material (17) is injected through the second grouting pipe (5).

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