An erosion protected suction pile foundation structure

Abstract

The present application relates to the technical fields of ocean engineering, in particular to a kind of scouring prevention suction pile foundation structure, including prestressed hollow circular tube piece, prestressed hollow circular tube piece is provided with male and female sliding groove along the height direction outside, including female sliding groove and male sliding groove, female sliding groove and male sliding groove are adaptively inserted, female sliding groove is also provided with water-swelling sealing strip, and column, foundation top plate, top plate rib plate are welded by pre-embedded steel member, the upper end of prestressed hollow circular tube piece is evenly embedded along ring line direction High-strength bolt is used to connect top plate rib plate and foundation top plate, foundation top plate is provided with water pumping hole, the lower end of prestressed hollow circular tube piece is provided with foundation blade foot, prestressed hollow circular tube piece is provided with tube piece lifting ring, positioning hole is opened in top plate rib plate and foundation top plate, for the connection of prestressed hollow circular tube piece and high-strength bolt, water pumping hole is provided with water pump. By the setting of structure, the construction of suction pile foundation structure can be carried out, and the anti-scouring performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ocean engineering, in particular to a scour-preventing suction pile foundation structure. BACKGROUND

[0002] As a new field and frontier of the international wind power industry, offshore wind power plays an important role in energy science research. Due to the low roughness of the sea surface, the offshore environment exhibits smaller turbulence and shear force compared to the land, thereby giving the offshore wind speed a greater value and higher stability. China has clearly included offshore wind power in the core strategic planning, and is committed to optimizing and upgrading the industrial layout, deepening the development of technological innovation, and focusing on implementing the cluster development strategy in the deep sea area.

[0003] Although China has abundant offshore wind power resources, the construction of offshore wind turbines is subject to harsh marine environments and complex geological conditions, which greatly increases the difficulty of offshore wind power engineering construction. As a unique structural form, the suction pile foundation has an open bottom and a closed top design, which enables it to effectively withstand large horizontal, vertical loads and bending moments. In addition, the suction pile foundation has a number of significant advantages, such as saving investment costs, shortening the foundation installation period, and being reusable. Therefore, in the field of offshore wind power engineering, the suction pile foundation has gradually attracted the attention and in-depth research of the industry. The suction pile foundation is usually made of thin-walled steel material. With the continuous increase in the installed capacity of offshore wind turbines, the size of the foundation design also increases, which leads to a large foundation volume, thereby causing a series of problems in transportation and installation. During the design process, if the wall thickness of the suction pile foundation is too thin, it will increase the risk of buckling during construction and installation, thereby causing damage to the overall structure. In addition, during installation, when hard soil layers are encountered, the penetration resistance will increase sharply, which requires a larger negative pressure to overcome the resistance, which may cause piping seepage damage to the skirt foundation soil, ultimately leading to the failure of the overall installation. These problems pose a serious threat to the safety and economy of offshore wind power engineering, and effective solutions are urgently needed. With the continuous development of building technology, ultra-high performance concrete (UHPC) has been widely used in civil engineering due to its excellent mechanical properties, corrosion resistance and durability. Ultra-high performance concrete (UHPC) can be considered for application in the design of suction pile foundations to solve the problems encountered by traditional thin-walled steel suction pile foundations in large-scale offshore wind power projects, such as transportation, installation, and structural stability.

[0004] Therefore, the application of ultra-high performance concrete in the design of suction pile foundations not only solves the problems encountered by traditional suction pile foundations in large-scale offshore wind power projects, but also improves the safety and economy of the foundation, providing strong support for the development of offshore wind power engineering. SUMMARY

[0005] In view of the problems in the prior art, the application provides a scour-preventing suction pile foundation structure.

[0006] The technical scheme adopted by the application to solve the technical problem is: a scour-preventing suction pile foundation structure, comprising prestressed hollow circular pipe pieces, male and female sliding grooves are arranged on the outer side of the prestressed hollow circular pipe pieces in the height direction, the male and female sliding grooves comprise a female sliding groove and a male sliding groove, the female sliding groove and the male sliding groove are adaptively and insertingly arranged, a water-swelling sealing strip is further arranged on the female sliding groove, and a stand, a foundation top plate and a top plate rib plate are arranged by welding through pre-embedded steel members;

[0007] High-strength bolts are uniformly embedded in the upper end of the prestressed hollow circular pipe piece along the ring line direction, for connecting the top plate rib plate and the foundation top plate, a water pumping hole is formed in the foundation top plate, a foundation edge foot is arranged at the lower end of the prestressed hollow circular pipe piece, a pipe piece lifting ring is arranged on the prestressed hollow circular pipe piece, positioning holes are formed in the top plate rib plate and the foundation top plate, for connecting the prestressed hollow circular pipe piece and the high-strength bolt, a water pump is arranged on the water pumping hole, and a top plate lifting ring is fixedly connected to the foundation top plate.

[0008] Specifically, a pipe piece grouting groove is formed in the male sliding groove, and when the female sliding groove and the male sliding groove are cooperatively and insertingly arranged, epoxy resin structural glue can be injected through the pipe piece grouting groove, a reserved bolt hole is formed in the top plate rib plate, and the reserved bolt hole is fixed to the prestressed hollow circular pipe piece and the foundation top plate through a bolt.

[0009] Specifically, an arc-shaped bolt is arranged at the bottom of the foundation top plate, and the foundation top plates are limitingly connected through the arc-shaped bolts, a top plate connection portion grouting groove is arranged on the foundation top plate, and a top plate grouting hole is communicatively arranged at the top of the top plate connection portion grouting groove.

[0010] Specifically, an inflatable buoyancy ring is arranged outside the prestressed hollow circular pipe piece, an underwater jet robot is arranged between the prestressed hollow circular pipe piece and the foundation top plate, can clean the soil, and can inject concrete to solidify the soil into a flow state, thereby fixing the pile body.

[0011] The application has the following beneficial effects:

[0012] Firstly, the application realizes the goal of rapid installation on site through factory prefabricated assembly components, and the prefabricated assembly method greatly reduces the on-site construction time and cost, improves the work efficiency, and simultaneously, since all components are produced in a standardized manner in the factory, the quality is effectively guaranteed, and the construction quality risk is reduced.

[0013] Secondly, the prestressed ultra-high performance concrete material is used to manufacture the component, the strength and durability of the foundation structure are significantly improved, the prestressed ultra-high performance concrete has excellent mechanical properties and crack resistance, can effectively resist the erosion and damage of the marine environment, and ensures the long-term stable operation of the foundation structure.

[0014] Thirdly, the epoxy structural adhesive and high-strength bolts are used for component connection, the integrity and sealing of the structure are ensured, the epoxy structural adhesive has excellent bonding strength and weather resistance, can ensure the firm and reliable connection between components, and the high-strength bolts provide strong fastening force, further enhance the stability of the structure.

[0015] Fourthly, the application of the underwater jet robot realizes the automatic leveling and penetration of the foundation, the robot technology can accurately flush the soil in the pipe piece, so that the foundation is automatically leveled during the sinking process, and the inclination problem in the traditional method is avoided, and the underwater jet robot can also flush the base soil, so that the foundation can continue to sink and install when encountering hard soil layer, and the construction efficiency is improved.

[0016] Fifthly, the flow state solidified soil fills the hollow part of the pipe piece, and continues to pour around the foundation to form a scouring protection layer, which not only enhances the scouring resistance of the foundation, but also improves the overall stability of the structure, the flow state solidified soil is closely combined with the inner wall of the pipe piece, effectively preventing the penetration and scouring of seawater, and prolonging the service life of the foundation. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be further described below in combination with the drawings and examples.

[0018] Figure 1 It is a front perspective view of the main body in the application;

[0019] Figure 2 It is a top view of the main body in the application;

[0020] Figure 3 It is a side view of the main body in the application;

[0021] Figure 4 It is a connection structure diagram of the prestressed hollow circular pipe piece in the application;

[0022] Figure 5 It is a butt joint part structure diagram of the prestressed hollow circular pipe piece in the application;

[0023] Figure 6 It is a bottom structure diagram of the prestressed hollow circular pipe piece in the application;

[0024] Figure 7 It is a structure diagram of the roof rib plate in the application;

[0025] Figure 8 This is a schematic diagram of the structure of the foundation top plate in this invention;

[0026] Figure 9 This is a bottom view of the foundation top plate in this invention;

[0027] Figure 10 This is a schematic diagram of the combined structure of the air-filled buoyancy ring and the prestressed hollow annular tube segment in this invention;

[0028] Figure 11 This is a schematic diagram of the prestressed hollow annular tube segment, foundation cutting edge, and underwater jet robot scouring and hollowing out the soil in this invention.

[0029] Figure 12 This is a structural diagram of the completed construction state in this invention.

[0030] In the diagram: 1. Prestressed hollow ring segment; 2. High-strength bolt; 3. Pumping hole; 4. Segment lifting ring; 5. Foundation cutting edge; 6. Male and female sliding grooves; 6-1. Female sliding groove; 6-2. Male sliding groove; 7. Top plate lifting ring; 8. Top plate rib; 9. Foundation top plate; 10. Column; 11. Segment grouting groove; 12. Water-swellable sealing strip; 13. Reserved bolt hole; 14. Arc bolt; 15. Grouting groove at top plate connection; 16. Top plate grouting hole; 17. Inflatable buoyancy ring; 18. Underwater jet robot; 19. Soil; 20. Pump; 21. Fluidized solidified soil. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] The invention will be further described below with reference to the accompanying drawings.

[0033] Example

[0034] like Figures 1-9 As shown, the present invention provides an anti-scouring suction pile foundation structure, including a prestressed hollow annular tube segment 1. The prestressed hollow annular tube segment 1 is provided with male and female sliding grooves 6 on the outer side along the height direction. The male and female sliding grooves 6 include a female sliding groove 6-1 and a male sliding groove 6-2. The female sliding groove 6-1 and the male sliding groove 6-2 are fitted and plugged together. The female sliding groove 6-1 is also provided with a water-swellable sealing strip 12. The column 10, the foundation top plate 9, and the top plate rib plate 8 are welded together by pre-embedded steel components.

[0035] The prestressed hollow circular pipe piece 1 is uniformly embedded with high-strength bolts 2 along the ring line direction on the upper end, used for connecting the roof rib plate 8 and the foundation roof 9, the foundation roof 9 is provided with a water pumping hole 3, the lower end of the prestressed hollow circular pipe piece 1 is provided with a foundation blade foot 5, the prestressed hollow circular pipe piece 1 is provided with a pipe piece lifting ring 4, the roof rib plate 8 and the foundation roof 9 are provided with positioning holes, used for the connection of the prestressed hollow circular pipe piece 1 and the high-strength bolt 2, the water pumping hole 3 is provided with a water pumping pump 20, and the foundation roof 9 is fixedly connected with a roof lifting ring 7.

[0036] The male sliding groove 6-2 is provided with a pipe piece grouting groove 11, and when the female sliding groove 6-1 and the male sliding groove 6-2 are matched and inserted, epoxy structural adhesive can be injected through the pipe piece grouting groove 11, the roof rib plate 8 is provided with a reserved bolt hole 13, and the reserved bolt hole 13 is fixed with the prestressed hollow circular pipe piece 1 and the foundation roof 9 through bolts.

[0037] The bottom of the foundation roof 9 is provided with an arc-shaped bolt 14, and a plurality of foundation roofs 9 are connected through the arc-shaped bolt 14, the foundation roof 9 is provided with a roof connection grouting groove 15, and the top of the roof connection grouting groove 15 is provided with a roof grouting hole 16.

[0038] The outside of the prestressed hollow circular pipe piece 1 is provided with an inflatable buoyancy ring 17, an underwater jet robot 18 is installed between the prestressed hollow circular pipe piece 1 and the foundation roof 9, which can clean the soil 19 and inject concrete, and can solidify to form a flow state solidified soil 21, thereby fixing the pile body.

[0039] The working principle is: in use, the prestressed hollow circular pipe piece 1 is made of prestressed ultra-high performance concrete, the prestressed hollow circular pipe piece 1 is composed of four or more pieces to form the skirt part of the suction pile foundation, the male and female sliding grooves 6 are arranged on the outside of the prestressed hollow circular pipe piece 1 along the height direction, used for connecting and positioning adjacent pipe pieces, the female sliding groove 6-1 is provided with a groove, and the male sliding groove 6-2 has a T-shaped structure, and a pipe piece grouting groove 11 is arranged between them to inject epoxy structural adhesive, at the same time, the female sliding groove 6-1 is provided with a water-swelling sealing strip 12 inside, which can automatically expand and enhance the air tightness between the pipe pieces when the suction pile foundation is sunk, and the stand column 10 is welded and connected with the foundation roof 9 and the roof rib plate 8 through the embedded steel member.

[0040] The prestressed hollow circular pipe piece 1 is uniformly embedded with high-strength bolts 2 along the ring line direction on the upper end, used for connecting the foundation roof 9 and the roof rib plate 8, the lower end of the prestressed hollow circular pipe piece 1 is provided with a foundation blade foot 5 with a certain slope, the prestressed hollow circular pipe piece 1 is provided with a pipe piece lifting ring 4 for convenient hoisting and installation, and the male sliding groove 6-2 and the female sliding groove 6-1 are nested with each other between the prestressed hollow circular pipe pieces 1, forming a tight connection structure.

[0041] The foundation top plate 9 and the top plate rib 8 have positioning holes for connecting with the high-strength bolts 2 at the upper end of the prestressed hollow annular tube segment 1. The top plate rib 8 is connected to the inner and outer sides of the prestressed hollow annular tube segment 1, while the foundation top plate 9 is only connected to the inner side of the prestressed hollow annular tube segment 1. The foundation top plate 9 is provided with a water pumping hole 3 for connecting a water pump 20 during the suction sinking installation process.

[0042] A grouting groove 15 for sealing the top plate connection is provided between the foundation top plate 9 and the prestressed hollow annular tube segment 1. A grouting groove 15 for sealing the top plate is reserved between the foundation top plates 9. An arc bolt hole and a groove for placing are reserved at the bottom of the foundation top plate 9.

[0043] The foundation top plates 9 are connected by arc bolts 14, and the holes of the arc bolts 14 are prefabricated.

[0044] The prestressed hollow annular segments 1, foundation top plate 9, and top plate ribs 8 of the prestressed ultra-high performance concrete suction pile foundation are prefabricated in the factory. Then, these components are transported to a near-shore port for assembly. During the assembly process, the skirt plate is precisely installed between the prestressed hollow annular segments 1 through male and female sliding grooves 6. Epoxy resin structural adhesive is injected into the segment grouting grooves 11 of the male and female sliding grooves 6 to ensure the stability and sealing of the connection. After the prestressed hollow annular segments 1 are installed, stable inflatable buoyancy rings 17 are installed around the segments to smoothly lift the skirt plate segments into the ocean.

[0045] The suction pile foundation top plate 9 and top plate rib 8 are hoisted and installed in the port. The foundation top plate 9 and top plate rib 8 are tightly connected to the prestressed hollow annular segment 1 by high-strength bolts 2 and arc bolts 14. At the same time, epoxy resin structural adhesive is injected into the grouting groove 15 at the top plate connection to further ensure the stability and sealing of the structure.

[0046] The assembled suction pile foundation is towed to the installation position by a ship. A water pump 20 is installed at the circular opening on the top plate, and the suction pile foundation is driven to a certain depth by its own weight. Then, the water pump 20 is turned on to form a pressure difference between the inside and outside of the foundation, so that the suction pile foundation continues to penetrate into the seabed under negative pressure.

[0047] If the foundation tilts during the sinking process, underwater jet robots 18 can be installed in the hollow part of the prestressed hollow annular segment 1. These robots can flush the soil 19 embedded in the hollow part of the high side segment of the foundation and extract the flushed mud, thereby automatically leveling the suction pile foundation.

[0048] If the foundation encounters difficult geological layers such as iron plate sand or hard soil layers during the penetration process, the water pump 20 can be turned off, and the underwater jet robot 18 inside the tunnel segment can be used to flush and hollow out the foundation soil, so that the foundation can continue to sink and be installed. After the foundation cutting foot 5 passes through these difficult strata, the water pump 20 can be turned on again to allow the foundation to continue to sink and penetrate by suction.

[0049] Once the suction pile foundation is installed to the designated depth, the underwater jet robot 18 inside the segment thoroughly flushes the soil inside the pipe. The extracted mud is then mixed with cement to form fluidized solidified soil 21, which is then refilled into the hollow part of the segment. The grouting continues, and the fluidized solidified soil automatically diffuses around the suction pile foundation. After it solidifies, it forms an erosion protection layer, further enhancing the stability and durability of the foundation. At the same time, the segment lifting ring 4 and the top plate lifting ring 7 can enhance the bond strength between the suction pile foundation structure and the fluidized solidified soil 21, thus completing the work.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for installing an anti-erosion suction pile foundation structure, characterized in that, The aforementioned scour-resistant suction pile foundation structure includes prestressed hollow annular segments. The prestressed hollow annular segments are provided with male and female sliding grooves on the outer side along the height direction. The male and female sliding grooves include a female sliding groove and a male sliding groove. The female sliding groove and the male sliding groove are fitted and plugged together. The female sliding groove is provided with a water-swellable sealing strip. The columns, foundation top plate, and top plate ribs are welded together through pre-embedded steel components. High-strength bolts are evenly embedded along the ring direction at the upper end of the prestressed hollow annular segment to connect the top slab rib and the foundation top slab. A water pump is installed in the foundation top slab, and a top slab lifting ring is fixedly connected to the foundation top slab. A foundation cutting edge is provided at the lower end of the prestressed hollow annular segment, and a segment lifting ring is provided on the prestressed hollow annular segment. A segment grouting groove is provided on the male sliding groove, and epoxy resin structural adhesive can be injected through the segment grouting groove when the female sliding groove and male sliding groove are inserted together. Pre-drilled bolt holes are provided on the top slab rib, and these pre-drilled bolt holes are used for bolt... The prestressed hollow annular tube segments and foundation top slab are fixed together by bolts; the bottom of the foundation top slab is equipped with arc bolts, and multiple foundation top slabs are connected by arc bolts for limiting; the foundation top slab is equipped with a grouting groove at the top slab connection, and the top of the grouting groove at the top slab connection is connected to a grouting hole; an air-filled buoyancy ring is fitted on the outside of the prestressed hollow annular tube segments; an underwater jet robot is installed between the prestressed hollow annular tube segments and the foundation top slab, which can clean the soil and inject concrete to solidify it into fluid solidified soil for fixing the piles; The prestressed hollow ring segment is made of prestressed ultra-high performance concrete and consists of four segments. The installation method is as follows: Pre-stressed hollow annular segments, foundation top plate, and top plate ribs of the pre-assembled prestressed ultra-high performance concrete suction pile foundation are prefabricated in the factory. Then, they are transported to the port for assembly. During assembly, the skirt plate is installed between the prestressed hollow annular segments via male and female sliding grooves. Epoxy resin structural adhesive is injected into the grouting grooves between the segments to ensure the stability and sealing of the connection. After the prestressed hollow annular segments are installed, stable inflatable buoyancy rings are installed around the segments to smoothly hoist the skirt plate segments into the ocean. The foundation top plate and top plate ribs are hoisted and installed in the port. The foundation top plate and top plate ribs are tightly connected to the prestressed hollow annular segments using high-strength bolts and arc bolts. Epoxy resin structural adhesive is injected into the grouting grooves at the top plate connections to ensure stability and sealing. The assembled suction pile foundation is towed to the installation position, relying on its own weight to sink to a certain depth. A water pump is then turned on to create internal and external pressure on the foundation. The suction pile foundation continues to penetrate into the seabed under negative pressure. During the penetration process, if the foundation tilts, the jet robot can flush the soil embedded in the hollow segments on the high side of the foundation and extract the flushed mud, allowing the suction pile foundation to automatically level itself. If it encounters a geological layer that is difficult to penetrate during the penetration process, the water pump is turned off, and the jet robot flushes and hollows out the base soil, allowing the foundation to continue to sink and install. After the foundation cutting edge passes through the geological layer that is difficult to penetrate, the water pump is turned on again to allow the foundation to continue suction penetration. When the suction pile foundation is installed to the designated depth, the jet robot thoroughly flushes the soil inside the pipe, adds the extracted mud to cement and mixes it into fluidized solidified soil, which is then refilled into the hollow part of the segment and the grouting continues. The fluidized solidified soil will automatically spread around the suction pile foundation, and after it solidifies, it forms an erosion protection layer, enhancing the stability and durability of the foundation. The segment lifting rings and the top plate lifting rings can enhance the bond strength between the suction pile foundation structure and the fluidized solidified soil.

2. The installation method of the erosion-resistant suction pile foundation structure according to claim 1, characterized in that: Positioning holes are provided on the top ribs and foundation top slab for connecting prestressed hollow annular segments and high-strength bolts.

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