Concrete jacket structure of offshore booster station and construction method

Abstract

The invention relates to an offshore booster station concrete jacket structure and a construction method.The jacket structure comprises a plurality of jacket assemblies which are arranged in an up-down stacked mode, and each jacket assembly comprises a plurality of concrete stand columns and inter-column steel trusses arranged among the concrete stand columns; each concrete stand column is of a prestressed concrete pipe pile structure, the upper portion of each concrete stand column is provided with a steel corbel lap joint node used for supporting a steel truss between the columns, and the bottom of each concrete stand column is provided with a concrete connecting sleeve used for being connected with a lower jacket assembly in a sleeved mode. And the concrete connecting sleeve of the jacket assembly on the lowermost layer is fixedly connected with the steel pipe pile. A prestressed concrete stand column and a steel truss structure are combined, a construction installation method of single-layer prefabrication and multi-layer assembly is adopted, the concrete structure has the advantages of being high in adaptability, safe, reliable, low in manufacturing cost, simple in manufacturing process and the like, the material characteristics can be fully exerted, the construction cost can be reduced, and the construction efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore booster stations, and in particular to a concrete jacket structure and a construction method for an offshore booster station. Background Art

[0002] As a key renewable energy source, offshore wind power holds far-reaching strategic value for promoting sustainable development, environmental protection, economic restructuring, and enhancing energy security. Offshore wind power foundations come in a variety of forms, including single pile foundations, jacket foundations, gravity foundations, and multi-pile cap foundations. Jacket foundations, due to their high rigidity, high load-bearing capacity, strong adaptability, and minimal impact from wind, waves, and currents, have become a common foundation type in offshore wind power projects, particularly for offshore booster stations.

[0003] With the accelerated development of deep-sea wind power, jacket foundations are becoming increasingly economically advantageous. However, as operating water depths increase, the length and steel usage of traditional steel jacket foundations also increase, making transportation and construction more difficult. Therefore, improving traditional jacket structures to reduce costs and improve construction efficiency has become a key focus.

[0004] Several patents have proposed assembled jacket structures to address the transportation and installation challenges of deepwater jacket structures. Patent CN201710258104.6, a wind turbine foundation assembled with a four-corner sleeve jacket and its construction method, proposes a structure in which multiple jacket sections are connected in sequence, bolted together via flanges to form a single structure. This structure offers the advantage of relatively low individual component weight, eliminating the need for large lifting and transportation equipment and reducing installation and transportation costs. However, the structure utilizes a large amount of steel, and offshore bolting is complex, leading to significant installation and construction difficulties and high corrosion protection requirements.

[0005] Patent (CN202120532424.8) discloses an offshore wind turbine jacket foundation that combines steel piles and a multi-layer support frame. Each layer of the support frame includes three connecting rods and multiple reinforcing rods. The upper and lower layers of connecting rods are slotted into each other and tightly connected by bolts. While this structure reduces transportation costs by allowing the support frames to be transported and installed separately, it also suffers from the complex bolting and construction difficulties.

[0006] Currently, no patents related to offshore substation foundations consider the use of assembled concrete jackets. The offshore substation jacket structure mainly bears vertical loads, and the concrete structure has the advantages of good compressive resistance and high bearing capacity, which can fully utilize the material properties. Summary of the Invention

[0007] To solve the above problems, the present invention provides a concrete jacket structure and construction method for an offshore booster station. The structure uses concrete columns to replace the main legs of the steel structure, and has the advantages of high structural stability, strong bearing capacity, and saving steel. It adopts single-layer prefabrication and multi-layer assembly, which can be adapted to different water depth environments and has stronger applicability. The single-layer structure is more convenient for marine transportation, and the construction and installation method is simple, which can reduce construction costs and improve construction efficiency.

[0008] The technical solution adopted by the present invention is: a concrete jacket structure of an offshore substation, characterized in that it includes a plurality of jacket assemblies stacked up and down, each of the jacket assemblies includes a plurality of concrete columns and inter-column steel trusses arranged between the plurality of concrete columns; each of the concrete columns is a prestressed concrete pipe pile structure, the upper part is provided with a steel corbel lap joint for supporting the inter-column steel trusses, and the bottom is provided with a concrete connecting sleeve for being sleeved with the lower jacket assembly; the concrete connecting sleeve of the lower jacket assembly is fixedly connected to the steel pipe pile.

[0009] Preferably, the steel pipe piles are provided with anti-sinking expansion steel plates.

[0010] Preferably, each of the jacket assemblies comprises four concrete columns arranged in a square shape.

[0011] Preferably, a rubber gasket is provided at the bottom of the concrete connecting sleeve for grouting and sealing during assembly.

[0012] Preferably, a high-pressure grouting pipe communicating with the interior of the concrete connecting sleeve is provided on the outside of each concrete column.

[0013] Preferably, the inter-column steel trusses are made of rectangular tubes.

[0014] Preferably, the upper chord of the inter-column steel truss is provided with a ring node for fixed connection with the steel corbel lap node, and the vertical X-bracing of the truss of the inter-column steel truss is fixed to the concrete connecting sleeve at the bottom of the concrete column by welding with embedded parts.

[0015] A construction method for a concrete jacket structure of an offshore booster station is characterized by comprising the following steps: S1. Design and manufacture of single-layer jacket components Design the number of jacket assembly layers, as well as the specifications and dimensions of concrete columns, inter-column steel trusses, and steel pipe piles, based on seawater depth, geological conditions, and load combination parameters. Assemble the fabricated concrete columns, inter-column steel trusses, and high-pressure grouting pipes into single-layer jacket assemblies. Complete the assembly of multiple single-layer jacket assemblies according to the design plan. S2. Steel pipe pile driving construction In the designated project area, a positioning system is used to guide steel pipe piles into the seabed, ensuring that their verticality, burial depth, and pile spacing meet the jacket assembly requirements. S3. Multi-layer jacket assembly According to the design plan, anti-sinking expansion steel plates are first inserted onto four steel pipe piles to the mud surface. Next, the concrete connection sleeves of the bottom jacket assembly are inserted downward along the corresponding four steel pipe piles and seated on the anti-sinking expansion steel plates. The upper jacket assemblies are then hoisted layer by layer, and the concrete connection sleeves of the upper jacket assembly are assembled with the tops of the concrete columns of the lower jacket assembly and fixed by grouting through the external high-pressure grouting pipes. In this way, multiple layers of jacket assemblies are assembled in sequence. S4. Install the upper platform After the multi-layer jacket components are assembled and fixed, the upper structure of the offshore booster station is hoisted and connected and fixed to the top foundation of the jacket, thus completing the other installation work.

[0016] The beneficial effects achieved by the present invention are: combining prestressed concrete columns with steel truss structures, adopting a single-layer prefabrication and multi-layer assembly construction and installation method, and the concrete structure has the advantages of strong adaptability, safety and reliability, low cost, simple manufacturing process, etc., which can give full play to the material properties, reduce construction costs, and improve construction efficiency.

[0017] Compared to traditional jacket foundations, the structure of this invention uses concrete columns instead of steel legs, offering advantages such as high structural stability, strong load-bearing capacity, and reduced steel consumption. The jacket structure utilizes a single-layer prefabrication and multi-layer assembly method, making it adaptable to varying water depths and offering greater adaptability. The single-layer structure facilitates offshore transport, and the simplified construction and installation method reduces construction costs and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 Schematic diagram of the assembly method; Figure 3 It is a top view of a single-layer jacket; Figure 4 This is a structural diagram of a single-layer jacket; Figure 5 This is the structural diagram of the concrete column; Figure 6 This is the structural diagram of the steel truss between columns; In the figure: 1. Concrete column; 2. Steel truss between columns; 11. Steel corbel lap joint; 12. Concrete connecting sleeve; 3. Steel pipe pile; 4. High-pressure grouting pipe; 5. Anti-sinking expansion steel plate; 6. Rubber gasket. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] like Figures 1-6 As shown, the present invention discloses a concrete jacket structure for an offshore substation, comprising a plurality of jacket assemblies stacked one above the other. Each jacket assembly comprises a plurality of concrete columns 1 and inter-column steel trusses 2 disposed between the plurality of concrete columns 1. Each concrete column 1 is a prestressed concrete pipe pile structure, with a steel bracket lap joint 11 at the top for supporting the inter-column steel trusses 2 and a concrete connecting sleeve 12 at the bottom for connecting with the lower jacket assembly. The concrete connecting sleeve 12 of the lowest jacket assembly is fixedly connected to the steel pipe pile 3. The present invention utilizes a combination of prestressed concrete columns and steel truss structures, employing a single-layer prefabrication and multi-layer assembly construction and installation method. The concrete structure offers advantages such as strong adaptability, safety and reliability, low cost, and a simple manufacturing process. This fully utilizes the material's properties to reduce construction costs and improve construction efficiency.

[0021] In this embodiment, the concrete columns 1 utilize prestressed concrete tubular piles, with diameters tailored to actual requirements. Steel corbel joints 11 are located one-third of the column's height from the top surface, secured with circular clamps. Four rectangular corbels support the inter-column steel trusses. A concrete connection sleeve 12 is designed at the bottom of the concrete column 1. During fabrication, the reinforcement cage is tied and cast into the mold along with the main column. The top surface of the concrete connection sleeve 12 is embedded, and a rubber gasket 6 is located at the bottom of the concrete connection sleeve 12 to provide a grouting seal during assembly. The steel corbel lap joint 11 is fixed with an annular clamp, and four rectangular corbels are used to support the inter-column steel truss; the concrete connecting sleeve 12 is located at the bottom of the concrete column 1 and is used for the assembly and fixation of multiple jacket components; a rubber gasket 6 is designed at the bottom of the concrete connecting sleeve 12 for grouting and sealing during assembly; a high-pressure grouting pipe 4 is provided on the outside of the concrete column for grouting and fixation after the concrete connecting sleeve 12 is assembled with the lower concrete column 1.

[0022] In this embodiment, an anti-sinking expansion steel plate 5 is sleeved on the steel pipe pile 3 .

[0023] In this embodiment, each jacket assembly includes four concrete columns 1 arranged in a square shape.

[0024] In this embodiment, the inter-column steel trusses 2 are made of rectangular tubes.

[0025] In this embodiment, the upper chord of the inter-column steel truss 2 is provided with a ring node for fixed connection with the steel corbel lap node 11, and the vertical X-bracing of the truss of the inter-column steel truss 2 is fixed to the concrete connecting sleeve 12 at the bottom of the concrete column 1 by welding through embedded parts.

[0026] A construction method for the above-mentioned offshore booster station concrete jacket structure can prefabricate multiple jacket assemblies according to the project water depth. During construction, the steel pipe pile 3 foundation is first installed, and then the prefabricated single-layer jacket assemblies are hoisted in layers for assembly and grouting. After the jacket assembly is completed, the superstructure is hoisted. The method specifically includes the following steps: S1. Design and manufacture of single-layer jacket components Design the number of jacket assembly layers, as well as the specifications and dimensions of the concrete columns 1, inter-column steel trusses 2, and steel pipe piles 3, based on the seawater depth, geological conditions, and load combination parameters. Assemble the fabricated concrete columns 1, inter-column steel trusses 2, and high-pressure grouting pipes 4 into single-layer jacket assemblies. Complete the assembly of multiple single-layer jacket assemblies according to the design plan. S2. Steel pipe pile driving construction In the designated project sea area, the steel pipe piles 3 are guided into the seabed using a positioning system so that their verticality, burial depth and pile spacing meet the jacket assembly requirements; S3. Multi-layer jacket assembly According to the design plan, first, the anti-sinking expansion steel plate 5 is inserted into the four steel pipe piles 3 to the mud surface; then, the concrete connecting sleeve 12 of the bottom layer jacket assembly is inserted and assembled downward along the corresponding four steel pipe piles 3 and seated on the anti-sinking expansion steel plate 5; then, the upper layer jacket assembly is hoisted layer by layer, and the concrete connecting sleeve 12 of the upper layer jacket assembly is assembled with the top of the concrete column 1 of the lower layer jacket assembly and fixed by grouting through the external high-pressure grouting pipe 4. In this way, the multiple layers of jacket assembly are assembled in sequence; S4. Install the upper platform After the multi-layer jacket components are assembled and fixed, the upper structure of the offshore booster station is hoisted and connected and fixed to the top foundation of the jacket, thus completing the other installation work.

[0027] It should be noted that the description of the above technical solutions is illustrative only. This specification may be embodied in various forms and should not be construed as limiting the technical solutions set forth herein. Rather, these descriptions are provided to ensure that the disclosure of the present invention is thorough and complete and to fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of the present invention are limited only by the scope of the claims.

[0028] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and is susceptible to numerous variations. Any simple modifications, equivalent variations, and modifications to the above embodiments based on the technical essence of the present invention shall be deemed to fall within the scope of protection of the present invention.

Claims

1. A concrete jacket structure for an offshore booster station, characterized by: The invention comprises a plurality of jacket components stacked up and down, each of the jacket components comprising a plurality of concrete columns (1) and inter-column steel trusses (2) arranged between the plurality of concrete columns (1); each of the concrete columns (1) is a prestressed concrete pipe pile structure, the upper portion of which is provided with a steel bracket lap joint (11) for supporting the inter-column steel trusses (2), and the bottom portion of which is provided with a concrete connection sleeve (1) 2 for sleeve connection with the lower jacket component; the concrete connection sleeve (12) of the lower jacket component is fixedly connected to the steel pipe pile (3).

2. The offshore booster station concrete jacket structure according to claim 1, characterized in that: The steel pipe pile (3) is sleeved with an anti-sinking expansion steel plate (5).

3. The offshore booster station concrete jacket structure according to claim 1, characterized in that: Each of the jacket components comprises four concrete columns (1) arranged in a square shape.

4. The offshore booster station concrete jacket structure according to claim 1, characterized in that: The bottom of the concrete connecting sleeve (12) is provided with a rubber gasket (6) for grouting and sealing during assembly.

5. The offshore booster station concrete jacket structure according to claim 1, characterized in that: The outside of each concrete column (1) is provided with a high-pressure grouting pipe (4) that is in communication with the interior of the concrete connecting sleeve (11).

6. The offshore booster station concrete jacket structure according to claim 1, characterized in that: The inter-column steel trusses (2) are made of rectangular tubes.

7. The offshore booster station concrete jacket structure according to claim 1, characterized in that: The truss upper chord of the inter-column steel truss (2) is provided with a ring node for fixed connection with the steel corbel lap node (11), and the truss vertical X-bracing of the inter-column steel truss (2) is fixed to the concrete connection sleeve (12) at the bottom of the concrete column (1) by welding through embedded parts.

8. A construction method for a concrete jacket structure of an offshore booster station according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Design and manufacture of single-layer jacket components According to the seawater depth, geological conditions and load combination parameters, the number of jacket assembly layers and the specifications and sizes of the concrete columns (1), the inter-column steel trusses (2) and the steel pipe piles (3) are designed; the manufactured concrete columns (1), the inter-column steel trusses (2) and the high-pressure grouting pipes (4) are assembled into a single-layer jacket assembly, and the assembly of multiple single-layer jacket assemblies is completed according to the design plan; S2. Steel pipe pile driving construction In the designated project sea area, the steel pipe piles (3) are guided to be inserted into the seabed using a positioning system so that their verticality, burial depth and pile spacing meet the requirements for jacket assembly; S3. Multi-layer jacket assembly According to the design scheme, first, the anti-sinking expansion steel plate (5) is inserted on the four steel pipe piles (3) to the mud surface position; secondly, the concrete connection sleeve (12) of the bottom layer jacket assembly is inserted and assembled along the corresponding four steel pipe piles (3) and seated on the anti-sinking expansion steel plate (5); then, the upper layer jacket assembly is hoisted layer by layer, and the concrete connection sleeve (12) of the upper layer jacket assembly is assembled with the top of the concrete column (1) of the lower layer jacket assembly and fixed by grouting through the outer high-pressure grouting pipe (4), and in this way, the multiple layers of jacket assembly are assembled in sequence; S4. Install the upper platform After the multi-layer jacket components are assembled and fixed, the upper structure of the offshore booster station is hoisted and connected and fixed to the top foundation of the jacket, thus completing the other installation work.

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