Offshore wind power prestress UHPC large-diameter thin-wall single pile foundation
By adopting prestressed UHPC large diameter thin-walled single pile foundation, the shortcomings in manufacturing, processing, durability and economics of traditional steel pipe single pile foundations are solved, and high stiffness, excellent fatigue resistance and reduced operation and maintenance costs are achieved.
Patent Information
- Application Number
- CN202420330869.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-22
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-22
AI Technical Summary
Traditional steel pipe single pile foundations have shortcomings in manufacturing processing, durability, economy, etc., especially in harsh marine environments, which leads to high later operation and maintenance costs.
Using prestressed UHPC large diameter thin wall single pile foundation, the UHPC pipe piles are prefabricated in sections and connected with prestressed steel strands, combined with the design of steel pile boots and flange, to form high stiffness and excellent fatigue resistance. Performance infrastructure.
It realizes the convenience and economy of construction and installation, and at the same time improves the fatigue, impact and corrosion resistance of the infrastructure, reducing the cost of later operation and maintenance.
Smart Images
Figure CN222456160U_ABST
Abstract
Description
Technical Field
[0001] The invention relates to wind power generation equipment, in particular to an offshore wind power prestressed UHPC large-diameter thin-walled single pile foundation. Background Art
[0002] Offshore wind farms have great development prospects due to their advantages such as high wind speed, stable wind force and vast space. my country has abundant offshore wind energy resources, and the offshore wind energy reserves that can be developed and utilized are about 750 million kW. However, relevant research reports point out that the investment in the foundation structure of wind turbines accounts for as much as 16% of the total investment, and it increases with the increase in seawater depth, and can even reach 30% of the total investment cost. Therefore, improving the reliability of the foundation structure of offshore wind turbines is of great research significance for the development of wind power in my country.
[0003] Among the types of offshore wind turbine foundations, the single pile foundation has a simple structure, clear forces, and advantages such as fast construction speed, so the single pile foundation accounts for more than 65% of offshore wind farms at home and abroad. The single pile foundation bears the gravity from the tower and periodic loads such as wind and waves, and it is necessary to ensure that it has sufficient strength, rigidity, stability, fatigue resistance and corrosion resistance. At present, the single pile foundations of wind turbines that are widely studied and applied at home and abroad are mainly steel pipe piles. However, the fatigue problem of steel pipe piles is prominent, and the harsh marine environment will accelerate the corrosion of steel, which will significantly increase the cost of later operation and maintenance, and the foundation is a hidden project and difficult to repair. In addition, as the diameter of the steel pipe pile increases, it will exceed the scope of current manufacturing and installation technology. Summary of the invention
[0004] The purpose of the embodiment of the present application is to provide an offshore wind power prestressed UHPC large-diameter thin-walled single pile foundation, which overcomes the shortcomings of traditional steel pipe single pile foundations in terms of manufacturing, durability, and economy.
[0005] The technical solution adopted by the present invention to solve the technical problem is: an offshore wind power prestressed UHPC large-diameter thin-walled single pile foundation, comprising a steel pile shoe, a prefabricated UHPC pipe pile and a flange plate arranged in sequence from bottom to top. The steel pile shoe is connected to the prefabricated UHPC pipe pile by a prestressed steel strand, and the prefabricated UHPC pipe pile is connected to the flange plate by a prestressed anchor bolt.
[0006] Furthermore, the steel pile shoe is composed of a flange, a cylinder and a plurality of stiffening ribs, all of which are made of anti-corrosion galvanized steel strip; the diameter and width of the flange are consistent with the bottom cross-section of the prefabricated UHPC pipe pile, and holes are reserved on the flange for the prestressed steel strands to pass through; the inner diameter of the cylinder is equal to the inner diameter of the prefabricated UHPC pipe pile, the cylinder is welded to the flange, and the stiffening ribs are welded to the cylinder and the flange.
[0007] Furthermore, the prefabricated UHPC pipe pile is composed of a plurality of UHPC pipe pile segments, each segment having a diameter-to-thickness ratio of 1 / 40 to 1 / 20; holes are reserved for prestressed steel strands to pass through at corresponding positions of each segment, and each pipe pile segment is connected by the prestressed steel strands.
[0008] Furthermore, a plurality of longitudinal reinforcement stirrups are arranged in the UHPC pipe pile segment, the fiber volume content of the UHPC material is ≥2.0%, the axial tensile strength of the UHPC material is above 8.0 MPa, the axial tensile ultimate strain is above 0.2%, and the compressive strength is above 100 MPa.
[0009] Furthermore, a plurality of grooves are reserved at the top of the UHPC pile, the positions of the grooves correspond to the reserved steel strand holes, and the sizes of the grooves are set according to the anchoring requirements of the prestressed steel strands. After the ends of the prestressed steel strands are sealed and anchored, the grooves are filled with high-strength mortar.
[0010] Furthermore, a number of prestressed anchor bolts are embedded in the top of the UHPC piles.
[0011] Furthermore, the diameter and width of the top flange are consistent with the cross-section of the adjacent prefabricated UHPC piles.
[0012] The beneficial effects of the utility model are:
[0013] (1) The large-diameter UHPC thin-walled pipe piles are prefabricated in sections, which are convenient for manufacturing, steaming and transportation. At the same time, prestressed steel strands are used to connect the various parts of the pile body, which is convenient for construction and installation and has great economic value.
[0014] (2) Prestressed UHPC piles have high rigidity, high bearing capacity, excellent fatigue resistance, impact resistance and corrosion resistance, and have the advantages of both steel and concrete structures, and have significant advantages in carbon emissions. At the same time, they can avoid the serious corrosion problem of steel piles and the 1P resonance problem in deep water, reduce the cost of later operation and maintenance of the structure, and have high economic and social benefits.
[0015] (3) By reserving a groove and pre-embedded prestressed anchor bolts at the top of the UHPC pile, the upper end of the prestressed steel strand is anchored in the groove, and the flange is connected to the top of the UHPC pile through the pre-embedded prestressed anchor bolts, thereby reserving a steel plane at the top of the pile. Therefore, it is particularly suitable for construction using the hammer method, and a larger hammer force can be used to speed up the construction without damaging the component itself. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the prestressed UHPC large-diameter thin-walled pipe pile of the utility model;
[0017] Figure 2 It is a structural schematic diagram of the steel pile shoe of the utility model;
[0018] Figure 3 This is a schematic diagram of the top segment structure of the UHPC pipe pile of the utility model;
[0019] Figure 4 This is a schematic diagram of the standard segment structure of the UHPC pipe pile of the utility model;
[0020] Figure 5 It is a schematic diagram of the flange structure on the top of the pile of the utility model. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] In the following, in conjunction with the accompanying drawings, a prestressed UHPC large-diameter thin-walled single pile foundation for offshore wind power provided by the utility model embodiment is described in detail through specific embodiments and application scenarios.
[0023] See also Figure 1-5 As shown, an embodiment of the utility model provides an offshore wind power prestressed UHPC large-diameter thin-walled pipe pile, including a steel pile shoe 1 at the bottom of the pile, a prefabricated UHPC pipe pile 2 and a flange plate 3 at the top of the pile.
[0024] The steel pile shoe 1 includes a flange 11, a cylinder 12 and a stiffening rib 13. A hole 111 is reserved on the flange 11. The position and size of the hole 111 are determined according to the prestressed steel strand. The cylinder 12 is welded to the flange 11. The stiffening rib 13 is welded to the flange 11 and the cylinder 12. Figure 2 shown.
[0025] The prefabricated UHPC pile 2 includes a UHPC pile top segment 21 and a UHPC pile standard segment 22. The UHPC pile top segment 21 has a reserved prestressed steel strand channel 211, and a reserved groove 212 and a pre-buried prestressed anchor bolt 213 on the top section. Figure 3 The UHPC pile standard segment 22 has a reserved prestressed steel strand hole 221, which can be combined with Figure 4 shown.
[0026] The pile shoe 1 at the bottom of the pile is tensioned and anchored with the prefabricated UHPC pile 2 through the prestressed steel strand 4. One end of the steel strand is anchored in the groove 212 at the top of the UHPC pile. The top of the steel strand on this side is flush with the top section of the UHPC pile. After the end of the prestressed steel strand is sealed and anchored, the groove is filled with high-strength mortar. The other end of the steel strand is anchored in the reserved hole 111 of the steel pile shoe 1, which can be combined with Figure 1 shown.
[0027] The flange 3 has a bolt hole 31 and a groove 32, and the top 213 of the prestressed anchor bolt is flush with the top of the flange 3. Figure 5 shown.
[0028] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.
Claims
1. An offshore wind power prestressed UHPC large diameter thin wall single pile foundation, characterized in that: It includes a steel pile shoe, a prefabricated UHPC pipe pile and a flange plate which are arranged in sequence from bottom to top; the steel pile shoe is connected to the prefabricated UHPC pipe pile through a prestressed steel strand, and the prefabricated UHPC pipe pile is connected to the flange plate through a prestressed anchor bolt.
2. The offshore wind power prestressed UHPC large diameter thin wall single pile foundation according to claim 1 is characterized in that: The steel pile shoe is composed of a flange, a cylinder and stiffening ribs, all of which are made of anti-corrosion galvanized steel strip.
3. The offshore wind power prestressed UHPC large diameter thin wall single pile foundation according to claim 2 is characterized in that: The flange diameter and width of the steel pile shoe are consistent with the bottom cross-section of the prefabricated UHPC pipe pile, and holes are reserved on the flange for prestressed steel strands to pass through; the inner diameter of the cylinder is equal to the inner diameter of the prefabricated UHPC pipe pile, the cylinder is welded to the flange, and the stiffening ribs are welded to the cylinder and the flange.
4. The offshore wind power prestressed UHPC large diameter thin wall single pile foundation according to claim 1, characterized in that: The prefabricated UHPC pipe pile is composed of a plurality of UHPC pipe pile segments, each segment having a diameter-to-thickness ratio of 1 / 40 to 1 / 20; holes are reserved for prestressed steel strands to pass through at corresponding positions of each segment, and the pipe pile segments are connected by prestressed steel strands.
5. The offshore wind power prestressed UHPC large diameter thin wall single pile foundation according to claim 4 is characterized in that: A plurality of longitudinal reinforcement stirrups are arranged in the UHPC pipe pile segment, and the axial tensile strength of the UHPC material is above 8.0 MPa, the axial tensile ultimate strain is above 0.2%, and the compressive strength is above 100 MPa.
6. The offshore wind power prestressed UHPC large diameter thin wall single pile foundation according to claim 1, characterized in that: A plurality of grooves are reserved on the top of the UHPC pile, the positions of the grooves correspond to the reserved steel strand channels, and the sizes of the grooves are set according to the anchoring requirements of the prestressed steel strands; the grooves are filled with high-strength mortar after the ends of the prestressed steel strands are sealed and anchored.
7. The offshore wind power prestressed UHPC large diameter thin wall single pile foundation according to claim 1, characterized in that: A plurality of prestressed anchor bolts are embedded in the top of the UHPC pile.
8. The offshore wind power prestressed UHPC large diameter thin wall single pile foundation according to claim 1, characterized in that: The diameter and width of the flange are consistent with the cross-section of the adjacent prefabricated UHPC piles.