Floating offshore wind power foundation concrete pipe joint connecting device and construction method

Abstract

A floating offshore wind power foundation concrete pipe joint connecting device and construction method, comprising a plurality of sequentially spliced concrete pipe joints, at least one connecting structure is embedded in the concrete pipe joint, used for connecting a plurality of concrete pipe joints; the connecting structure comprises a support body, a partition plate is arranged in the support body, at least one middle area and grouting areas located on both sides of the middle area are formed by the partition plate, a plurality of connecting pieces connected with adjacent concrete pipe joints are arranged in the grouting area, and a steel strand is arranged in the middle area; compared with the prior art, through the combination design of the embedded connecting structure, the grouting area arranged in the connecting structure and the steel strand, the connecting piece in the connecting structure is connected in the grouting area in the adjacent concrete pipe joint, and the grouting area is grouted with concrete, so that the efficient splicing between the concrete pipe joints is realized.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power development equipment technology, specifically to a floating offshore wind power foundation concrete pipe section connection device and construction method. Background Technology

[0002] Floating offshore wind power, as a key technology for unlocking the vast wind energy resources of deep seas, has extremely broad development prospects. Compared with traditional fixed foundations, floating platforms can be deployed in vast sea areas at depths exceeding 50 meters or even deeper, avoiding near-shore ecologically sensitive areas and conflicts over sea use, and can capture higher-quality and more stable wind resources. This will greatly expand the exploitable sea area and is considered the main development direction for the future large-scale and grid-parity development of offshore wind power. However, current floating wind power technology, especially its foundation structure, still faces significant cost challenges. Mainstream floating foundations, such as the most widely used semi-submersible platforms, are generally constructed using all-steel structures. This structure has advantages such as mature design, high strength, and ease of standardized manufacturing, but its most prominent problem is the extremely large amount of steel used.

[0003] To withstand the harsh environment of the deep sea (the huge dynamic loads generated by wind, waves, currents, etc.) and ensure the stability and structural integrity of the platform, the foundation needs to use a large amount of heavy steel. The amount of steel used accounts for a high proportion of the total investment of the entire platform and even the entire wind power project, which has become one of the core factors that keep the construction cost of floating wind power projects high, and seriously restricts its large-scale commercialization and the improvement of its economic competitiveness.

[0004] Chinese Patent Application No. 202323566011.X discloses a floating offshore wind power steel structure foundation with a working platform. The disclosed steel structure foundation includes a tower, a working platform, a floating seat, a floating frame, a positioning structure, a gravity base, wind turbine blades, guardrails, and connecting columns. The working platform is provided at the bottom of the tower, the floating seat is provided below the working platform, the floating frame is provided on the outside of the floating seat, the positioning structure is provided on both sides below the floating frame, the gravity base is installed directly below the floating seat, the wind turbine blades are installed on one side of the top of the tower, the guardrails are fixedly installed on both sides of the surface of the floating seat, and connecting columns are fixedly installed between the four sides of the outer wall of the floating seat and the four sides of the inner wall of the floating frame. Chinese Patent Application No. 202220479579.4 discloses a prestressed steel structure integrated type of offshore floating wind power foundation structure. The disclosed floating wind power foundation structure includes multiple floats, trusses, steel pipes, and wind turbine towers. The steel pipes are connected to the lower part of the wind turbine towers, and the steel pipes are connected to the floats via trusses. Prestressed steel strands are set between adjacent floats to form multiple floats into a whole.

[0005] To overcome the cost constraints of all-steel structures and promote the economic feasibility of floating wind power, many scholars and industry experts are actively exploring solutions that use concrete as an alternative or partial replacement for steel structures. Concrete itself has significant advantages: its cost is typically much lower than steel of equivalent strength; it is highly corrosion-resistant, particularly suitable for marine salt spray environments, extending structural lifespan and reducing later maintenance costs. Furthermore, precast concrete component technology is relatively mature and has a wide application base in the field of civil engineering.

[0006] Currently, floating offshore wind power foundations generally adopt all-steel structures, resulting in huge steel consumption and high construction costs, which restricts their large-scale commercial application. Although concrete materials have advantages such as low cost and corrosion resistance, they are limited by construction technology and cannot be cast in one piece to form ultra-large floating structures, such as pontoons, columns and other pipe sections, thus making it difficult to realize the large-scale application of concrete in floating foundations. Summary of the Invention

[0007] The present invention aims to overcome the defects in the prior art and provide a simple structure for connecting concrete pipe sections of a floating offshore wind power foundation and a construction method thereof, which enables segmented splicing of concrete pipe sections.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a floating offshore wind power foundation concrete pipe section connection device, comprising a plurality of concrete pipe sections spliced ​​sequentially, wherein at least one connection structure is pre-embedded in the concrete pipe section for connecting the plurality of concrete pipe sections; the connection structure includes a support body, wherein a partition plate is provided in the support body, and the support body is provided with at least one central region formed by the partition plate and grouting regions located on both sides thereof, wherein a plurality of connectors connected to adjacent concrete pipe sections are provided in the grouting regions, and steel strands are threaded through the central region.

[0009] In a preferred embodiment of the present invention, the partition plate is disposed in the middle of the support body, and the partition plate is disposed along the height direction of the support body.

[0010] As a preferred embodiment of the present invention, the central region is configured as the tension region of the steel strand.

[0011] As a preferred embodiment of the present invention, the partition plate is provided with a plurality of holes distributed along its height direction, and the steel strands are threaded through the holes.

[0012] As a preferred embodiment of the present invention, a plurality of the connectors are distributed along the height direction of the grouting area, and the plurality of connectors are horizontally arranged on the support body.

[0013] As a preferred embodiment of the present invention, at least one end of the plurality of connectors extends horizontally and beyond the connection structure for pre-embedding into the corresponding grouting area of ​​adjacent concrete pipe sections.

[0014] As a preferred embodiment of the present invention, both the upper and lower ends of the support body are provided with connecting plates for connecting concrete pipe sections, and the connecting plates are arranged along the height direction of the support body.

[0015] A construction method for a floating offshore wind turbine foundation concrete pipe section connection device includes the following steps:

[0016] S1. Prefabricated connection structure;

[0017] S2. Place the prefabricated connection structure into the mold, pour concrete, and cure to form a concrete pipe section with the structure embedded in it.

[0018] S3. Perform preliminary assembly of adjacent concrete pipe sections, so that their connectors are inserted into the opposite grouting areas in an alternating manner;

[0019] S4. Inject grout into the grouting area through the reserved pipeline until the grout overflows, and then carry out curing.

[0020] S5. Repeat steps S3 and S4 to complete the splicing of all concrete pipe sections.

[0021] S6. Tensioning ends are set at both ends of the assembled structure, and steel strands are installed so that they pass through the pre-embedded pipes of each concrete pipe section and the tension area of ​​the steel strands of each connecting structure in sequence.

[0022] S7. Tension the steel strands and apply prestress to complete the construction.

[0023] As a preferred embodiment of the present invention, in step S3, an axial lifting device is used to adjust the position of adjacent concrete pipe sections to achieve precise splicing.

[0024] In a preferred embodiment of the present invention, in step S4, the slurry is self-compacting concrete.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. By replacing some or all of the steel with concrete, the material cost and anti-corrosion maintenance cost of floating foundations are significantly reduced. Furthermore, concrete pipe sections can be prefabricated in segments, avoiding the complexity and high cost of integral casting. This effectively solves the problems of large steel consumption and high investment in all-steel structures, and enhances the economic competitiveness of floating wind power. At the same time, through the combined design of pre-embedded connection structures, grouting areas set in the connection structures, and steel strands, the connectors in the connection structures are connected to the grouting areas in adjacent concrete pipe sections, and concrete is poured into the grouting areas, thereby achieving efficient splicing between concrete pipe sections.

[0027] 2. Furthermore, after the connectors are staggered and inserted into the grouting area, self-compacting concrete is poured in to ensure the compactness and shear strength of the connection; the steel strands are laid in the middle area and prestressed, which enhances the tensile performance and dynamic load bearing capacity of the overall structure, so that the connection part has the same integrity as the overall casting.

[0028] 3. The construction method combines standardized prefabrication with on-site assembly. Concrete pipe sections can be mass-produced in the factory to ensure quality. During on-site splicing, the position is adjusted by an axial lifting device to achieve precise alignment. The grouting process is simple and efficient. This method avoids the difficulties of large formwork support and overall pouring, improves construction efficiency, and facilitates quality control.

[0029] 4. The connecting device is flexibly designed to adapt to concrete pipe sections of different sizes and shapes; the concrete material itself is resistant to marine corrosion, extending the structural lifespan and reducing the need for later maintenance. The overall structure has good stability and buoyancy performance, making it suitable for harsh deep-sea environments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the connection structure of the present invention;

[0032] Figure 3 This is a front view of the connection structure of the present invention;

[0033] Figure 4 It is a structural diagram of multiple concrete pipe sections spliced ​​together.

[0034] Reference numerals: 1. Concrete pipe section; 2. Connecting structure; 201. Support body; 201. Side plate; 2011. Top plate; 2012. Divider plate; 202. Hole; 2021. Grouting area; 203. Connector; 204. Steel strand; 205. Central area; 206. Connecting plate; 207. Detailed Implementation

[0035] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] like Figures 1-4As shown, a floating offshore wind power foundation concrete pipe section connection device includes several concrete pipe sections 1 spliced ​​together in sequence. At least one connection structure 2 is pre-embedded in each concrete pipe section 1 for connecting several concrete pipe sections 1. The connection structure 2 includes a support body 201, a partition plate 202 is provided in the support body 201, and at least one central region 206 formed by the partition plate 202 and grouting regions 203 located on both sides therein are provided. Several connectors 204 connected to adjacent concrete pipe sections 1 are provided in the grouting regions 203. Steel strands 205 are threaded through the central region 206.

[0037] Furthermore, the concrete tube segment 1 can be any tube segment structure of a floating wind power foundation, and the cross-sectional shape can be cylindrical, square, elliptical, etc. The connecting structure 2 is set at the end of the cross-section of the concrete tube segment 1. The connecting structure 2 is a steel box-shaped structure, and its longitudinal length depends on the actual engineering design, generally in the range of 1m-2m. Its number and lateral position can be set according to the cabin space layout of the concrete segments of the floating foundation and the overall structural strength. When only one connecting structure 2 is set in the concrete tube segment 1, it is generally located in the middle area of ​​the concrete tube cross-section in the lateral position. The supporting body 201 of the connecting structure 2 is a cuboid space, and a partition plate 202 is set in the space. The partition plate 202 is a longitudinally set steel plate, which divides the cuboid space into three areas: left, middle, and right. The central area is used to connect the steel strand 205, and the left and right areas are the grouting areas of the connector 204. Through the combined design of the pre-embedded connection structure 2, the grouting area 203 set in the connection structure 2, and the steel strand 205, the connector 204 in the connection structure 2 is connected to the grouting area 203 in the adjacent concrete pipe section 1, and concrete is poured into the grouting area 203, thereby realizing the efficient splicing between the concrete pipe sections 1.

[0038] The supporting body 201 is formed by connecting the side plates 2011 arranged vertically and parallel on both sides and the top plate 2012 located at both ends of the side plates 2011, thus forming a rectangular structure with a cuboid space.

[0039] The partition plate 202 is located in the middle of the support body 201 and is set along the height direction of the support body 201. Furthermore, the upper and lower ends of the partition plate 202 are fixedly connected to the support body 201. The partition plate 202 divides the interior of the support body 201 into three areas, of which the two sides are grouting areas 203 and the middle is the central area 206. The central area 206 is set as the tension area of ​​the steel strand 205. The steel strand 205 passes through the central area 206. The partition plate 202 is provided with several holes 2021 distributed along its height direction. The steel strand 205 passes through the holes 2021, thereby realizing the application of prestress when splicing multiple concrete pipe sections 1.

[0040] Several connectors 204 are distributed along the height direction of the grouting area 203, and several connectors 204 are horizontally set on the support body 201. Furthermore, at least one end of several connectors 204 extends horizontally and exceeds the connecting structure 2, and is used to be pre-embedded in the corresponding grouting area 203 of the adjacent concrete pipe section 1. The connector 204 is an L-shaped steel plate, and the length of the connector 204 exceeds the length of the connecting structure 2. One end of the connector 204 that exceeds the length of the adjacent connecting structure 2 is used to insert into the grouting area 203 of the adjacent connecting structure 2 to which it is connected, and the other end that exceeds the grouting area 203 is used for subsequent pre-embedding of concrete segments to enhance the connection with the concrete segments.

[0041] Furthermore, the connectors 204 of the connecting structure 2 in the adjacent concrete pipe sections 1 are arranged in an alternating manner to ensure that the connectors 204 do not interfere with each other when the pipe sections are connected, and can form a strong connection after grouting, providing stable strength and shear resistance.

[0042] Both the upper and lower ends of the support body 201 are provided with connecting plates 207 for connecting concrete pipe sections 1. The connecting plates 207 are arranged along the height direction of the support body 201. Furthermore, the connecting plates 207 are arranged on the top plate 2012 and are arranged around the three sides of the top plate 2012. The connecting plates 207 are connected to the concrete pipe sections 1, thereby increasing the connection strength between the connecting structure 2 and the concrete pipe sections 1.

[0043] A construction method for a floating offshore wind turbine foundation concrete pipe section connection device includes the following steps:

[0044] S1, Prefabricated connection structure 2;

[0045] Prefabrication of connecting structure 2: Welding of the supporting body 201, partition plate 202, connector 204 and connecting plate 207 of connecting structure 2 is carried out in a dock or steel structure factory.

[0046] S2. Place the prefabricated connecting structure 2 into the mold, pour concrete, and cure to form a concrete pipe section 1 with the structure embedded in it.

[0047] Prefabrication of concrete pipe section 1: The two prefabricated connecting structures 2 are placed into the mold of concrete pipe section 1 in sections, and concrete is poured and cured using the pre-embedded process to form concrete pipe section 1 with the connecting structures 2 pre-embedded.

[0048] S3. The adjacent concrete pipe sections 1 are initially assembled so that their respective connectors 204 are staggered and inserted into the opposite grouting areas 203.

[0049] Splicing of adjacent concrete pipe sections 1: The precast concrete pipe sections 1 are transported to the final assembly site by flatbed truck for the first assembly. The adjacent concrete pipe sections 1 are spliced ​​by axially lifting the lower flatbed truck. The connecting parts 204 of the adjacent pipe sections are inserted into the grouting area 203 in an alternating manner.

[0050] S4. Inject grout into grouting area 203 through the reserved pipeline until grout overflows, and then carry out curing.

[0051] Grouting in grouting area 203: Grouting operation is carried out by injecting self-compacting concrete through the reserved pipe in grouting area 203 until the grout overflows, and then curing is carried out.

[0052] S5. Repeat steps S3 and S4 to complete the splicing of all concrete pipe sections 1.

[0053] S6. Tensioning ends are set at both ends of the assembled structure, and steel strands 205 are installed so that they pass through the pre-embedded pipes of each concrete pipe section 1 and the tension area of ​​the steel strands 205 of each connecting structure 2 in sequence.

[0054] Steel strand 205 installation: Install tie plates or flanges at both ends of the assembled concrete section, install steel strand 205, and pass through each concrete pipe section 1 respectively. The concrete part passes through the PVC pipe pre-embedded in the mold and through the hole 2021 left in the aforementioned steel strand tie area.

[0055] S7. Tension the steel strand 205, apply prestress, and complete the construction.

[0056] Tensioning of steel strand 205: After the installation of steel strand 205 is completed, tensioning is carried out to apply prestress, thus completing the construction and splicing.

[0057] Furthermore, the above construction method combines standardized prefabrication with on-site assembly. Concrete pipe sections 1 can be mass-produced in the factory to ensure quality. During on-site splicing, the position is adjusted by an axial lifting device to achieve precise alignment. The grouting process is simple and efficient. This method avoids the difficulties of large formwork support and overall pouring, improves construction efficiency, and facilitates quality control.

[0058] As indicated in the instruction manual, in step S3, an axial lifting device is used to adjust the position of adjacent concrete pipe sections 1 to achieve precise splicing.

[0059] In step S4, the grout is self-compacting concrete.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0061] Although this document frequently uses reference numerals from the figures, such as concrete pipe section 1, connecting structure 2, supporting body 201, side plate 2011, top plate 2012, partition plate 202, hole 2021, grouting area 203, connector 204, steel strand 205, central area 206, and connecting plate 207, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A construction method for a floating offshore wind turbine foundation concrete pipe section connection device, characterized in that, The device comprises several sequentially spliced ​​concrete pipe sections (1), each of which has at least one pre-embedded connecting structure (2) for connecting the concrete pipe sections (1); the connecting structure (2) includes a support body (201), which has a partition plate (202) and at least one central region (206) formed by the partition plate (202) and grouting regions (203) on both sides thereof. The grouting regions (203) have several connectors (204) that connect to adjacent concrete pipe sections (1), and steel strands (205) are threaded through the central region (206); the construction method of the device includes the following steps: S1, Prefabricated connection structure (2); S2. Place the prefabricated connection structure (2) into the mold, pour concrete, and cure to form a concrete pipe section (1) with the structure embedded in it. S3. The adjacent concrete pipe sections (1) are initially assembled so that their respective connectors (204) are staggered and inserted into the opposite grouting areas (203); S4. Inject grout into the grouting area (203) through the reserved pipe until the grout overflows, and then carry out curing. S5. Repeat steps S3 and S4 to complete the splicing of all concrete pipe sections (1); S6. Tensioning ends are set at both ends of the assembled structure, and steel strands (205) are installed so that they pass through the pre-embedded pipes of each concrete pipe section (1) and the tension area of ​​the steel strands (205) of each connecting structure (2) in sequence. S7. Tension the steel strand (205) and apply prestress to complete the construction.

2. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 1, characterized in that, The partition plate (202) is disposed in the middle of the support body (201), and the partition plate (202) is disposed along the height direction of the support body (201).

3. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 1, characterized in that, The central region (206) is set as the tension region of the steel strand (205).

4. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 1, characterized in that, The partition plate (202) has a number of holes (2021) distributed along its height direction, and the steel strand (205) is threaded through the holes (2021).

5. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 1, characterized in that, Several of the connectors (204) are distributed along the height direction of the grouting area (203), and several connectors (204) are horizontally arranged on the support body (201).

6. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 5, characterized in that, Several of the connectors (204) extend horizontally at least one end beyond the connection structure (2) for pre-embedding into the corresponding grouting area (203) of the adjacent concrete pipe section (1).

7. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 1, characterized in that, Both the upper and lower ends of the support body (201) are provided with connecting plates (207) for connecting concrete pipe sections (1), and the connecting plates (207) are arranged along the height direction of the support body (201).

8. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 1, characterized in that, In step S3, the position of adjacent concrete pipe sections (1) is adjusted using an axial lifting device to achieve precise splicing.

9. The construction method of a floating offshore wind power foundation concrete pipe section connection device according to claim 1, characterized in that, In step S4, the slurry is self-compacting concrete.

Images