Jacket foundation grouting reinforcement connecting structure and construction method thereof

Abstract

The invention relates to a jacket foundation grouting reinforcement connecting structure and a construction method thereof. The method is suitable for the technical field of offshore wind power. The technical problem to be solved by the invention is to provide the jacket foundation grouting reinforcement connecting structure and the construction method thereof. According to the technical scheme, a plugging assembly is arranged in a steel pipe pile, so that a cylindrical grouting area is formed in the steel pipe pile; the jacket supporting legs are embedded in the steel pipe piles or arranged outside the steel pipe piles in a sleeving mode, and the jacket supporting legs are connected with the ends of the steel pipe piles through jacket supporting assemblies, so that the jacket supporting legs can block the ends of the steel pipe piles; the grouting packer is arranged between the steel pipe pile and the jacket supporting leg, so that an annular grouting area is formed by the overlapped part of the steel pipe pile and the jacket supporting leg; the first grouting pipe leads to the annular grouting area and is used for injecting a high-strength grouting material into the annular grouting area; and the second grouting pipe leads to the cylindrical grouting area and is used for injecting a common grouting material into the cylindrical grouting area.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and in particular to a conductor frame foundation grouting reinforcement connection structure and a construction method thereof. Background Art

[0002] The realization of the goals of carbon peak and carbon neutrality requires the development of clean energy, especially the widespread application of renewable energy. As an important part of clean energy, offshore wind power has huge development potential.

[0003] With the vigorous development of offshore wind power, it is bound to develop in the deep sea in the future. The cost of floating wind turbine foundation is relatively high, and the jacket foundation has a wide range of applications due to its good adaptability to water depth. However, with the increase of water depth and the increase of single wind turbine capacity, the load on each leg of the jacket is getting bigger and bigger. The 120Mpa grouting material commonly used in the market is already a top-level grouting material. If the mechanical properties of the grouting material need to be further improved, fiber needs to be added, but the increase of fiber will increase the risk of grouting pipe blockage. With the increase of load, the traditional high-strength grouting material currently used between the jacket and the steel pipe piles can no longer meet the requirements. At the same time, with the increase of water depth, the difficulty of underwater welding is also increasing. It is urgent to take other strengthening measures to increase the reliable connection between the jacket and the steel pipe piles and ensure effective force transmission performance. Summary of the invention

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

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

[0006] A steel pipe pile is provided with a plugging assembly inside so that a columnar grouting area is formed inside the steel pipe pile;

[0007] A jacket leg is embedded in the steel pipe pile or is externally mounted on the steel pipe pile. The jacket leg is connected to the end of the steel pipe pile via a jacket support assembly, so that the jacket leg can block the end of the steel pipe pile.

[0008] A grouting packer is disposed between the steel pipe pile and the jacket leg so that the overlapping portion therebetween forms an annular grouting area;

[0009] A first grouting pipe, leading to the annular grouting area, 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 columnar grouting area, and the second grouting pipe is used to inject common grouting material into the columnar grouting area.

[0011] Through the above technical means, the jacket legs and the steel pipe piles are connected in an embedded or outer sleeve manner, an annular grouting area is formed at the overlapping part of the connection, and a columnar grouting area is formed in the steel pipe pile. High-strength grouting material is injected into the annular grouting area, and ordinary grouting material is injected into the columnar grouting area, thereby forming a double-channel 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 blocking plate. If the jacket leg is embedded in the steel pipe pile, the outer wall of the jacket leg is circumferentially connected with the jacket support plate, the jacket support plate is connected to and blocks 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 in the steel pipe pile is blocked by the blocking plate;

[0013] If the jacket of the jacketed casing leg is disposed outside the steel pipe pile, the inner wall of the jacketed casing leg is connected to the jacketed casing support plate, the jacketed casing support plate is connected to and blocks the end of the steel pipe pile, and the jacketed casing reinforcement plate is provided between the inner wall of the jacketed casing leg and the jacketed casing support plate along the annular interval.

[0014] In some embodiments, a guide assembly is further included, wherein the guide assembly is disposed in the columnar grouting area, and the guide assembly is used to provide grouting guidance for the second grouting pipe.

[0015] In some embodiments, the guide assembly includes a guide tube, one end of which is connected to the conductor frame support assembly, and the other end of the guide tube is connected to the sealing assembly. The second grouting pipe is arranged inside the conductor frame leg, and the end of the second grouting pipe passes through the conductor 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 guide assembly further includes a guide reinforcement plate, and the guide reinforcement plate is disposed between the side wall of the guide tube and the sealing assembly.

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

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

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

[0020] In some embodiments, a plurality of reinforcing steel bars are arranged in the columnar grouting area along the axial direction of the steel pipe pile.

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

[0022] S1. First determine the connection form between the jacket legs and the steel pipe piles. If the geological conditions are poor and the jacket foundation piles have high bearing capacity requirements, the jacket legs are embedded in the steel pipe piles. If the geological conditions are good and the jacket foundation piles have high bearing capacity requirements, the jacket legs are covered with steel pipe piles.

[0023] S2. When making steel pipe piles, weld the grouting bottom plate and reinforcing steel bars inside, and ensure that the steel pipe piles and the grouting bottom plate are constructed in place together when sinking the piles;

[0024] S3, hoist the upper jacket, embed the jacket legs into or cover the steel pipe piles, and pre-install the jacket support plates and support reinforcement plates at the connection between the jacket legs and the top of the steel pipe piles, so that the jacket can support its own weight before grouting;

[0025] S4. A grouting packer is preset on the jacket leg for grouting and plugging. A first grouting pipe is preset on the jacket leg. After the jacket is sunk into place and leveled, high-strength grouting material is poured through the first grouting pipe.

[0026] S5. A guide bottom plate is set in the steel pipe pile to cooperate with the grouting bottom plate for sealing. A guide pipe is set in the steel pipe pile, and a second grouting pipe is arranged in the guide pipe. After the grouting of high-strength grouting material is completed, the grouting construction of ordinary grouting material is carried out through the second grouting pipe.

[0027] The beneficial effects of the present invention are:

[0028] 1. Based on geological conditions and the bearing capacity requirements of the jacket foundation pile, the jacket legs and steel pipe piles are connected by embedded or jacket type. An annular grouting area is formed between the jacket legs and the steel pipe piles. High-strength grouting material is injected into the annular grouting area. At the connection between the jacket legs and the steel pipe piles, a columnar grouting area is formed inside the steel pipe piles. Ordinary grouting material is injected into the columnar grouting area, so that the connection between the jacket legs and the steel pipe piles is double-channel grouting, which enhances the reliable connection of the connection and ensures the force transmission performance of the connection. At the same time, due to the existence of double-channel grouting, the overall stiffness of the foundation is increased and the deformation of the foundation mud surface is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the connection structure in which the jacket legs are embedded in the steel pipe piles in this application.

[0030] Figure 2 It is a schematic diagram of the connection structure of the jacket leg of the present application being fitted onto the steel pipe pile.

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

[0032] Description of reference numerals:

[0033] 1. Conductor frame legs; 2. Steel pipe piles; 3. Grouting packers; 4. First grouting pipe; 5. Second grouting pipe; 6. Conductor frame support plate; 7. Conductor frame reinforcement plate; 8. Blocking plate; 9. Guide pipe; 10. Guide reinforcement plate; 11. Grouting bottom plate; 12. Guide bottom plate; 13. Sealing rubber; 14. Shear key; 15. Reinforced steel bars; 16. High-strength grouting material; 17. Ordinary grouting material.

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

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

[0036] "First," "second," etc. As used herein, these terms act as labels for the nouns that precede them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.). DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0038] Embodiment 1:

[0039] Combination Figures 1 to 3As shown, this embodiment is a jacket foundation grouting reinforcement connection structure, including a steel pipe pile 2, a jacket leg 1, a grouting packer 3, a first grouting pipe 4 and a second grouting pipe 5. The jacket leg 1 is embedded in the steel pipe pile 2 or the jacket leg 1 is mounted on the outside of the steel pipe pile 2. The jacket leg 1 is connected to the end of the steel pipe pile 2 through the jacket support assembly, so that the jacket leg 1 can block the end of the steel pipe pile 2. A plugging assembly is provided inside the steel pipe pile 2, and the plugging assembly cooperates with the jacket support assembly to form a columnar grouting area inside the steel pipe pile 2. A grouting packer 3 is provided between the steel pipe pile 2 and the jacket leg 1, so that the overlapping part between the two forms an annular grouting area. The first grouting pipe 4 leads to the annular grouting area, and the first grouting pipe 4 is used to inject high-strength grouting material 16 into the annular grouting area. The second grouting pipe 5 leads to the columnar grouting area, and the second grouting pipe 5 is used to inject ordinary grouting material 17 into the columnar grouting area.

[0040] In some embodiments, such as Figure 1 and Figure 3 As shown, when the jacket leg 1 is embedded in the steel pipe pile 2, the jacket support assembly includes a jacket support plate 6, a jacket reinforcement plate 7 and a plugging plate 8. The outer wall of the jacket leg 1 is circumferentially connected with the jacket support plate 6, the jacket support plate 6 connects and plugs the outer edge of the end of the steel pipe pile 2, and the jacket reinforcement plate 7 is circumferentially arranged between the outer wall of the jacket leg 1 and the jacket support plate 6. The end of the jacket leg 1 located in the steel pipe pile 2 is plugged by the plugging plate 8. Through the cooperation of the jacket support plate 6 and the grouting packer 3, an annular grouting area is formed between the outer wall of the jacket leg 1 and the inner wall of the steel pipe pile 2.

[0041] Furthermore, a plurality of shear keys 14 are arranged in the annular grouting area, and the integrity and shear resistance of the structure can be improved by using the shear keys 14. The first grouting pipe 4 is arranged inside the jacket leg 1, and the end of the first grouting pipe 4 penetrates the side wall of the jacket leg 1 and is introduced into the annular grouting area, so that the high-strength grouting material 16 can be injected into the annular grouting area by using the first grouting pipe 4.

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

[0043] Furthermore, a guide assembly is provided in the columnar grouting area, and the guide assembly is used to provide grouting guidance for the second grouting pipe 5. The guide assembly includes a guide pipe 9, one end of which is connected to the plugging plate 8, and the other end of which is connected to the guide bottom plate 12. The second grouting pipe 5 is arranged inside the conductor frame leg 1, and the end of the second grouting pipe 5 penetrates the plugging plate 8 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 area, so that the second grouting pipe 5 can be used to inject ordinary grouting material 17 into the columnar grouting area.

[0044] Furthermore, the guide assembly also includes a guide reinforcing plate 10, which is connected to the outer wall of the guide tube 9, and the two ends of the guide reinforcing plate 10 are respectively connected to the plugging plate 8 and the guide bottom plate 12. A plurality of reinforcing steel bars 15 are arranged along the axial direction of the steel pipe pile 2 in the columnar grouting area, some of which are welded to the plugging plate 8 in advance as a whole, and some of which are welded to the grouting bottom plate 11 in advance as a whole, so as to increase the connection performance between the ordinary grouting material 17 and the plugging plate 8 and the grouting bottom plate 11.

[0045] In some embodiments, such as Figure 2 As shown, when the jacket leg 1 is connected to the outside of the steel pipe pile 2, the jacket support assembly includes a jacket support plate 6 and a jacket reinforcement plate 7. The inner wall of the jacket leg 1 is connected to the jacket support plate 6, which connects and blocks the end of the steel pipe pile 2. The jacket reinforcement plate 7 is provided between the inner wall of the jacket leg 1 and the jacket support plate 6 along the annular interval. Through the cooperation of the jacket support plate 6 and the grouting packer 3, an annular grouting area is formed between the inner wall of the jacket leg 1 and the outer wall of the steel pipe pile 2.

[0046] Furthermore, a plurality of shear keys 14 are arranged in the annular grouting area, and the integrity and shear resistance of the structure can be improved by using the shear keys 14. The first grouting pipe 4 is arranged outside the jacket leg 1, and the end of the first grouting pipe 4 penetrates the side wall of the jacket leg 1 and is introduced into the annular grouting area, so that the high-strength grouting material 16 can be injected into the annular grouting area by using the first grouting pipe 4.

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

[0048] Furthermore, a guide assembly is provided in the columnar grouting area, and the guide assembly is used to provide grouting guidance for the second grouting pipe 5. The guide assembly includes a guide pipe 9, one end of which is connected to the jacket support plate 6, and the other end of which is connected to the guide bottom plate 12. The second grouting pipe 5 is arranged inside the jacket leg 1, and the end of the second grouting pipe 5 penetrates the jacket 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 area, so that the second grouting pipe 5 can be used to inject ordinary grouting material 17 into the columnar grouting area.

[0049] Furthermore, the guide assembly further comprises a guide reinforcing plate 10, which is connected to the outer wall of the guide tube 9, and the end of the guide reinforcing plate 10 is connected to the guide bottom plate 12. A plurality of reinforcing steel bars 15 are arranged along the axial direction of the steel pipe pile 2 in the columnar grouting area.

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

[0051] In this embodiment, the connection structure of the jacket leg 1 and the steel pipe pile 2 adopts a double-channel grouting technology. According to different geological conditions, an embedded or outer sleeve connection form can be selected. The annular space formed by the gap between the jacket leg 1 and the steel pipe pile 2 is used. The annular space is the annular grouting area. High-strength grouting material 16 is injected into the annular grouting area. 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, i.e., a columnar grouting area, is formed by utilizing the position inside the steel pipe pile 2 and close to the jacket leg 1. Common grouting material 17 is injected into the columnar grouting area, and the common grouting material 17 is utilized to provide internal support, thereby further enhancing the stability and force transmission performance of the connection. The double-channel grouting formed enhances the connection strength between the jacket leg 1 and the steel pipe pile 2, improves the bearing capacity of the overall structure, and 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] At the same time, if the single-channel grouting technology uses higher-strength grouting materials (such as adding fibers), it may increase the risk of pipe blockage. The double-channel grouting technology uses different materials in different areas, which can ensure strength while reducing construction difficulties caused by material characteristics.

[0054] Embodiment 2:

[0055] This embodiment is a construction method of a jacket foundation grouting reinforcement connection structure, comprising the following steps:

[0056] S1. First determine the connection form between the jacket leg 1 and the steel pipe pile 2. If the geological conditions are poor and the jacket foundation pile bearing capacity requirement is high, the jacket leg 1 is embedded in the steel pipe pile 2. If the geological conditions are good and the jacket foundation pile bearing capacity is easily met, the jacket leg 1 is covered with the steel pipe pile 2.

[0057] S2. When manufacturing the steel pipe pile 2, the grouting bottom plate 11 and the reinforcing steel bars 15 are welded inside. When sinking the pile, ensure that the steel pipe pile 2 and the grouting bottom plate 11 are constructed in place together.

[0058] S3, hoist the upper jacket, embed the jacket legs 1 into or cover the steel pipe piles 2, and pre-install the jacket support plates 6 and the support reinforcement plates at the connection parts between the jacket legs 1 and the tops of the steel pipe piles 2, so that the jacket can support its own weight before grouting.

[0059] S3.1. A shear key 14 is provided at the connection portion between the jacket leg 1 and the steel pipe pile 2 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 preset on the jacket leg 1 for grouting and plugging, and a first grouting pipe 4 is preset on the jacket leg 1. After the jacket is sunk into place and leveled, the high-strength grouting material 16 is poured through the first grouting pipe 4.

[0061] S5. A guide bottom plate 12 is set in the steel pipe pile 2 to cooperate with the grouting bottom plate 11 for sealing. A guide pipe 9 is set in the steel pipe pile 2. A second grouting pipe 5 is arranged in the guide pipe 9. After the grouting of the high-strength grouting material 16 is completed, the ordinary grouting material 17 is poured through the second grouting pipe 5.

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

[0063] S5.2, if the jacket leg 1 is used to cover the steel pipe pile 2, 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 bottom plate 12, and the guide reinforcement plate 10 is used to enhance the overall force bearing capacity. In order 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 bottom plate 11 and the jacket support plate 6. After the high-strength grouting is completed, the second grouting pipe 5 is used to perform the grouting construction of the ordinary grouting material 17.

[0064] S5.3. To prevent leakage of common grouting material 17, a sealing rubber 13 is provided between the guide bottom plate 12 and the grouting bottom plate 11. The size and compression deformation of the sealing rubber 13 should satisfy the deviation caused by the pile driving deviation and the manufacturing deviation.

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

Claims

1. A jacket foundation grouting reinforcement connection structure, characterized in that: include: A steel pipe pile (2) is provided with a plugging assembly inside, so that a columnar grouting area is formed inside the steel pipe pile (2); A jacket support leg (1) is embedded in the steel pipe pile (2) or is externally mounted on the steel pipe pile (2). The jacket support leg (1) is connected to the end of the steel pipe pile (2) via a jacket support assembly, so that the jacket support leg (1) can block 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 portion between the two forms an annular grouting area; A first grouting pipe (4), leading to the annular grouting area, the first grouting pipe (4) being used to inject high-strength grouting material (16) into the annular grouting area; The second grouting pipe (5) leads to the columnar grouting area, and the second grouting pipe (5) is used to inject common grouting material (17) into the columnar grouting area.

2. A jacket foundation grouting reinforcement connection structure according to claim 1, characterized in that: The jacket support assembly comprises a jacket support plate (6), a jacket reinforcement plate (7) and a blocking plate (8). If the jacket leg (1) is embedded in the steel pipe pile (2), the outer wall of the jacket leg (1) is circumferentially connected with the jacket support plate (6), the jacket support plate (6) is connected to and blocks the end of the steel pipe pile (2), the jacket reinforcement plate (7) is circumferentially spaced between the outer wall of the jacket leg (1) and the jacket support plate (6), and the end of the jacket leg (1) located in the steel pipe pile (2) is blocked by the blocking plate (8); If the jacket of the jacket leg (1) is disposed outside the steel pipe pile (2), the inner wall of the jacket leg (1) is connected to the jacket support plate (6), the jacket support plate (6) is connected to and blocks the end of the steel pipe pile (2), and the jacket reinforcement plate (7) is provided between the inner wall of the jacket leg (1) and the jacket support plate (6) along the annular direction.

3. The jacket foundation grouting reinforcement connection structure according to claim 1, characterized in that: It also comprises a guide assembly, which is arranged in the columnar grouting area and is used to provide grouting guidance for the second grouting pipe (5).

4. A jacket foundation grouting reinforcement connection structure according to claim 3, characterized in that: The guide assembly comprises a guide pipe (9), one end of the guide pipe (9) is connected to the conductor frame support assembly, and the other end of the guide pipe (9) is connected to the plugging assembly. The second grouting pipe (5) is arranged inside the conductor frame leg (1), and the end of the second grouting pipe (5) passes through the conductor frame support assembly and extends into the guide pipe (9) until the end of the second grouting pipe (5) passes through the side wall of the guide pipe (9) and is introduced into the columnar grouting area.

5. A jacket foundation grouting reinforcement connection structure according to claim 4, characterized in that: The guide assembly further comprises a guide reinforcement plate (10), wherein the guide reinforcement plate (10) is arranged between the side wall of the guide tube (9) and the blocking assembly.

6. The jacket foundation grouting reinforcement connection structure according to claim 1, characterized in that: The plugging assembly comprises a grouting bottom sealing plate (11) and a guide bottom sealing plate (12); the inner wall of the steel pipe pile (2) is welded with the annular grouting bottom sealing plate (11); and the center of the grouting bottom sealing plate (11) is connected to the guide bottom sealing plate (12).

7. A jacket foundation grouting reinforcement connection structure according to claim 6, characterized in that: A sealing rubber (13) is provided at the connection between the grouting bottom plate (11) and the guide bottom plate (12). The size and compression deformation of the sealing rubber (13) should meet the deviation caused by pile sinking and manufacturing.

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

9. The jacket foundation grouting reinforcement connection structure according to claim 1, characterized in that: A plurality of reinforcing steel bars (15) are arranged in the columnar grouting area along the axial direction of the steel pipe pile (2).

10. A construction method for a jacket foundation grouting reinforcement connection structure according to any one of claims 1 to 9, comprising the following steps: S1. First, determine the connection mode between the jacket leg (1) and the steel pipe pile (2). If the geological conditions are poor and the jacket foundation pile bearing capacity requirement is high, then the jacket leg (1) is embedded in the steel pipe pile (2). If the geological conditions are good and the jacket foundation pile bearing capacity is easily satisfied, then the jacket leg (1) is covered with the steel pipe pile (2). S2. When manufacturing the steel pipe pile (2), the grouting bottom plate (11) and the reinforcing steel bars (15) are welded internally. When sinking the pile, ensure that the steel pipe pile (2) and the grouting bottom plate (11) are constructed in place together; S3, hoisting the upper jacket, embedding the jacket legs (1) into or covering the steel pipe piles (2), and pre-arranging the jacket support plates (6) and the support reinforcement plates at the connection parts between the jacket legs (1) and the tops of the steel pipe piles (2), so that the jacket can support its own weight before grouting; S4, a grouting packer (3) is pre-set on the jacket leg (1) for grouting and plugging, a first grouting pipe (4) is pre-set on the jacket leg (1), and after the jacket is sunk into place and leveled, a high-strength grouting material (16) is poured through the first grouting pipe (4); S5. A guide bottom plate (12) is arranged in the steel pipe pile (2) to cooperate with the grouting bottom plate (11) for sealing. A guide pipe (9) is arranged in the steel pipe pile (2). A second grouting pipe (5) is arranged in the guide pipe (9). After the grouting of the high-strength grouting material (16) is completed, the ordinary grouting material (17) is poured through the second grouting pipe (5).

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