High-performance offshore wind power steel-UHPC combined pipe structure

Abstract

The utility model discloses a high-performance offshore wind power steel-UHPC (Ultra High Performance Concrete) combined pipe structure which comprises a steel pipe and a stud, and further comprises a UHPC outer wrapping layer wrapping the steel pipe from the outer side, the outer surface of the steel pipe is connected with the stud in a welding manner, and the UHPC outer wrapping layer is fixedly connected with the steel pipe through the stud. A rib net of a net structure is further arranged in the UHPC outer wrapping layer, the rib net is connected with the studs through spot welding or binding, and the steel pipe, the studs, the UHPC outer wrapping layer and the rib net form a steel-UHPC combined pipe structure used as a pipe pile or a jacket foundation or a tower drum or an anti-collision component or a cable tying component. The durability and the bearing capacity of the wind power structural member can be effectively improved, the reliability of the wind power structure is improved, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of protection of offshore wind power pipe piles or jacket foundations, towers, anti-collision and mooring components, and in particular to a high-performance offshore wind power steel-UHPC combined pipe structure. Background Art

[0002] As a clean, renewable energy source, offshore wind power has become a key component of global energy transformation due to its enormous development potential and low environmental impact. Compared to traditional onshore wind power, offshore wind power offers advantages such as higher and more stable wind speeds and a reduced land footprint. The development and utilization of offshore wind power has garnered significant attention, particularly in coastal countries and regions with abundant wind resources.

[0003] However, offshore wind turbine piles or jacket foundations, towers, anti-collision systems, and mooring cables, as key supporting structures for wind turbines, face severe challenges from the marine environment. The marine environment is characterized by high salinity, high humidity, high ultraviolet radiation, and frequent extreme weather events. These factors act together on wind turbine structural systems, leading to problems such as corrosion, fatigue, and structural degradation. Natural forces such as wind, waves, and currents exert dynamic loads on towers, which can cause structural damage and functional failure over the long term. Salt spray and chloride ions in seawater accelerate the corrosion process of materials, especially in steel structures, where corrosion is a prominent problem and seriously affects the durability and safety of the structure.

[0004] The attachment and growth of marine organisms can also impact wind turbine structures, increasing surface roughness and potentially altering fluid dynamics, impacting wind turbine efficiency and stability. Microbial corrosion in marine environments is also a significant concern. Certain microorganisms can metabolize metallic elements in steel structures, accelerating the corrosion process.

[0005] In addition, when routine maintenance vessels operate at sea, the wind turbine foundation system needs to provide support points for mooring. Frequent docking and anchoring of ships causes the foundation components, especially the anti-collision columns and mooring components, to be constantly impacted and rubbed by ships. This long-term physical impact makes the anti-corrosion coating on the anti-collision columns and the mooring components connected to them extremely vulnerable to damage. Once damaged, repair work is extremely difficult. It is particularly noteworthy that some maintenance vessels or out-of-control vessels, due to their large tonnage and high speed, may cause more serious local impacts on the anti-collision columns in emergency situations or due to improper operation. Such impacts may not only directly damage the structural integrity of the anti-collision columns, but also affect the stability and safety of the entire wind turbine facility.

[0006] Therefore, to ensure the long-term stable operation and structural safety of offshore wind turbine systems, effective protective measures must be implemented. These measures must be able to withstand marine corrosion, reduce maintenance costs, extend the service life of the structures, and comply with environmental protection and sustainable development requirements. These include, but are not limited to, developing new anti-corrosion materials, adopting advanced protection technologies, improving wind turbine structure design, and implementing effective monitoring and maintenance strategies.

[0007] Currently, traditional methods for protecting offshore wind turbine structural components mainly include heavy-duty anti-corrosion coatings and reinforced concrete wrapping. Although these methods can provide protection to a certain extent, they still have some obvious disadvantages and limitations, as described below:

[0008] 1. Limited durability

[0009] While traditional anti-corrosion coatings are easy to apply, their durability is limited. Long-term exposure to the harsh marine environment can cause the coating to gradually fail, requiring regular maintenance and re-coating. This not only increases long-term operating costs but can also lead to damage to the protective layer if not maintained promptly, exposing the wind turbine structure to corrosion.

[0010] 2. High maintenance costs

[0011] Traditional protection methods usually require regular inspections and maintenance, which leads to high maintenance costs. Especially in offshore environments, maintenance work is not only costly but also poses certain safety risks.

[0012] 3. Increase the weight of the structure

[0013] Since ordinary concrete has low resistance to corrosion from media such as chloride ions, the use of traditional concrete outer coating for corrosion protection requires increasing the thickness of the concrete outer coating. Although this can improve the durability of the wind turbine structure to a certain extent, due to the large thickness of the concrete structure, this method will increase the deadweight of the structure. This not only places higher requirements on the design, transportation and installation of the wind turbine structure, but may also affect the stability and bearing capacity of the structure.

[0014] 4. Limited impact and erosion resistance

[0015] When faced with unexpected impacts such as ship collisions and extreme water erosion, traditional protection technologies may not provide sufficient impact and wear resistance, resulting in damage to wind turbine structures. This risk is particularly significant under extreme weather conditions.

[0016] 5. Environmental issues

[0017] Traditional coatings and materials may contain harmful substances and potentially pollute the marine ecological environment. With the increasing environmental protection requirements, the use of these materials is increasingly restricted.

[0018] 6. High life cycle cost

[0019] Due to the need for maintenance and repair, the total cost of traditional protection technologies throughout their life cycle is high, which includes not only direct economic costs, but also downtime and potential safety risks caused by maintenance.

[0020] Although traditional offshore wind power structure protection technology can provide protection to a certain extent, it has obvious shortcomings in durability, maintenance costs, structural deadweight, impact and scour resistance, environmental issues, and life cycle costs. Utility Model Content

[0021] In response to the shortcomings of the existing technology, the purpose of this utility model is to propose a new type of offshore wind power structure, namely a high-performance offshore wind power steel-UHPC composite pipe structure, which aims to improve the durability and bearing capacity of components such as pipe piles or jacket foundations, towers, anti-collision and mooring cables, improve the reliability of wind power structures, extend their service life, and reduce maintenance costs.

[0022] The purpose of this utility model is achieved by the following technical solutions:

[0023] A high-performance offshore wind power steel-UHPC composite pipe structure includes a steel pipe and a stud, and also includes a UHPC outer layer covering the steel pipe from the outside. The outer surface of the steel pipe is welded to the stud, and the UHPC outer layer is fixedly connected to the steel pipe via the stud. A mesh-shaped reinforcement net is further provided within the UHPC outer layer, and the reinforcement net is connected to the stud by spot welding or binding. The steel pipe, stud, UHPC outer layer and the reinforcement net constitute a steel-UHPC composite pipe structure used as a pipe pile, a jacket foundation, a tower, an anti-collision component or a mooring component.

[0024] This new composite tubular structure utilizes steel pipes as the primary load-bearing components and UHPC as the outer structural layer. UHPC's exceptional strength and durability effectively resist marine erosion, extending the service life of offshore wind turbine structures and alleviating the corrosion burden on offshore wind turbine steel structures. This effectively reduces operational maintenance workload and significantly lowers operating costs. Furthermore, the reinforcement mesh in this new structure provides a strong hoop-like restraint, increasing the structural ductility and enhancing the crack resistance of the UHPC. Connecting the mesh with studs enhances the overall strength and durability of the steel-UHPC composite tubular structure.

[0025] The utility model also has the following preferred designs:

[0026] The steel-UHPC composite pipe structure of the present invention is manufactured in sections. The steel-UHPC composite pipe structure is formed by connecting multiple composite pipe segments. End connecting steel plates are provided at both ends of each composite pipe segment. The end connecting steel plates are fixedly connected to the steel pipes of the composite pipe segment. The composite pipe segments are assembled into an integral structure through the end connecting steel plates.

[0027] The reinforcement mesh of the present invention includes longitudinal reinforcements and transverse reinforcements. The longitudinal reinforcements are arranged along the length direction of the steel pipe, and the transverse reinforcements are arranged along the circumferential direction of the steel pipe to form annular reinforcements. The longitudinal reinforcements and the transverse reinforcements are formed into a mesh structure by binding and welding. The reinforcement mesh is attached to the outer surface of the steel pipe structure, and the longitudinal reinforcements and / or transverse reinforcements can be connected to the bolts by spot welding or binding.

[0028] The arrangement spacing of the longitudinal reinforcements of the present invention is 50mm-100mm, and the arrangement spacing of the transverse reinforcements is 50mm-100mm. Reinforcements with a diameter of 6mm-12mm can be used.

[0029] The longitudinal reinforcement and the transverse reinforcement of the present invention are steel bars and / or FRP bars.

[0030] The outer surface of the steel pipe of the utility model is evenly arranged with a plurality of studs along the length direction and the circumferential direction. The studs are welded to the steel pipe. The horizontal and vertical arrangement spacing of the studs can be 150mm to 300mm, which is used to enhance the bonding effect between the steel structure and the UHPC.

[0031] The utility model has the following beneficial effects:

[0032] 1. This new composite pipe structure uses steel pipes as the primary load-bearing components and UHPC material as the outer structure. UHPC material has exceptional strength and durability, effectively resisting marine erosion, extending the service life of offshore wind turbine structures, reducing the corrosion burden on offshore wind turbine steel structures, and exhibiting excellent collision resistance, thereby improving the overall safety of wind turbine structures. This new structure can effectively reduce operational maintenance workload and significantly lower operating costs.

[0033] 2. The reinforcement mesh of the utility model has a strong hoop restraint effect, which increases the ductility of the structure and improves the crack resistance of UHPC. The reinforcement mesh is connected with the studs, which can improve the overall strength and durability of the steel-UHPC composite pipe structure.

[0034] 3. The high toughness and crack resistance of the UHPC material of the present invention improve the stability of wind power structures under extreme environmental conditions.

[0035] 4. The construction and maintenance process of the UHPC outer cladding of the present invention is relatively simple and easy to operate, which is conducive to improving construction efficiency and ensuring quality.

[0036] 5. The structural system of the utility model is applicable to offshore wind power structural components of various sizes and shapes, and has strong versatility and adaptability.

[0037] In summary, by adopting the protection technology of the offshore wind power structure system of the present invention, the durability and safety of the offshore wind power structure can be effectively improved, providing strong technical support for the sustainable development of offshore wind power. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a plan view of the utility model's offshore wind power steel-UHPC composite pipe structure;

[0039] Figure 2 yes Figure 1 The AA cross-sectional view of the steel-UHPC composite tube structure shows the vertical structural composition of the steel-UHPC composite tube structure;

[0040] Figure 3 yes Figure 1 The BB cross-sectional view of the steel-UHPC composite tube structure shows the transverse structural composition of the steel-UHPC composite tube structure;

[0041] Figure 4 This is a large-scale drawing of the steel pipes and studs in the steel-UHPC composite pipe structure of the utility model, showing the plane details after the studs are welded to the outside of the steel pipe;

[0042] Figure 5 This is a large-scale drawing of the connection between the longitudinal and transverse reinforcements in the steel-UHPC composite tubular structure of the utility model, showing the detailed structure of the reinforcement network formed by the longitudinal and transverse reinforcements.

[0043] Figure 6 yes Figure 1 A detailed drawing of the middle and end connection steel plates showing the detailed structure of the end connection steel plates.

[0044] Description of reference numerals:

[0045] 10-Steel-UHPC composite tube structure, 1-Steel tube, 2-Stud, 3-Longitudinal reinforcement, 4-Transverse reinforcement, 5-UHPC outer cladding, 6-End connection steel plate. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can better understand and implement the technical solution of the present invention.

[0047] like Figures 1 to 6 As shown, a high-performance offshore wind power steel-UHPC composite pipe structure 10 includes a steel pipe 1 and a stud 2, and also includes a UHPC outer layer 5 covering the steel pipe 1 from the outside. The outer surface of the steel pipe 1 is welded to the stud 2, and the UHPC outer layer 5 is fixedly connected to the steel pipe 1 through the stud 2. A mesh-shaped reinforcement net is further provided in the UHPC outer layer 5, and the reinforcement net is connected to the stud 2 by spot welding or binding. The steel pipe 1, the stud 2, the UHPC outer layer 5 and the reinforcement net constitute a steel-UHPC composite pipe structure 10 used as a pipe pile, or as a jacket foundation, or as a tower, or as an anti-collision component, or as a mooring component.

[0048] The composite pipe structure uses a steel pipe 1 as the main load-bearing component. The wall thickness of the steel pipe 1 should be 16 mm to 28 mm. The UHPC material is used as the outer layer structure. The axial compressive strength of the UHPC material is not less than 120 MPa, the axial tensile strength is not less than 7 MPa, and the fiber volume content is not less than 2%.

[0049] In one embodiment, the steel-UHPC composite pipe structure 10 is manufactured in sections. The steel-UHPC composite pipe structure 10 is formed by connecting multiple composite pipe segments. End connecting steel plates 6 are provided at both ends of each composite pipe segment. The end connecting steel plates 6 are fixedly connected to the steel pipe 1 of the composite pipe segment. The composite pipe segments are assembled into an integral structure through the end connecting steel plates 6. The thickness of the end connecting steel plates 6 is 20 mm to 40 mm.

[0050] In one embodiment, the reinforcement mesh includes longitudinal reinforcement 3 and transverse reinforcement 4. The longitudinal reinforcement 3 is arranged along the length direction of the steel pipe 1, and the transverse reinforcement 4 is arranged along the circumferential direction of the steel pipe 1 to form an annular reinforcement. The longitudinal reinforcement 3 and the transverse reinforcement 4 are formed into a mesh structure by binding and welding. The reinforcement mesh is attached to the outer surface of the steel pipe 1 structure, and the longitudinal reinforcement 3 and / or the transverse reinforcement 4 can be connected to the bolt 2 by spot welding or binding.

[0051] In one embodiment, the longitudinal reinforcement 3 is spaced 50 mm to 100 mm apart, and the transverse reinforcement 4 is spaced 50 mm to 100 mm apart. Reinforcements with diameters of 6 mm to 12 mm can be used. Specifically, the longitudinal reinforcement 3 and transverse reinforcement 4 are steel bars and / or FRP bars. FRP bars are formed by gluing multiple strands of continuous fibers (such as glass fibers, carbon fibers, etc.) through a base material (such as polyamide resin, polyethylene resin, epoxy resin, etc.), extruding and drawing them through a special mold. Common fiber materials used for FRP bars include glass fiber reinforced plastics (GFRP), carbon fiber reinforced plastics (CFRP), and aramid fiber reinforced plastics (AFRP bars). They have the advantages of light weight, high tensile strength, strong corrosion resistance, strong material bonding, and strong magnetic wave permeability.

[0052] In one embodiment, a plurality of studs 2 are evenly arranged on the outer surface of the steel pipe 1 along the length and circumference. The studs 2 are welded to the steel pipe 1. The horizontal and vertical spacing of the studs 2 can be 150 mm to 300 mm to enhance the bonding effect between the steel structure and the UHPC. The studs 2 can be 35×13 mm cylindrical head studs.

[0053] The manufacturing and construction method for the high-performance offshore wind power steel-UHPC composite tubular structure described above first requires dividing the structure into segments according to the design drawings at a steel structure fabrication plant. Steel pipes 1 are then fabricated to the segment lengths, and the end connecting steel plates 6 are machined to the dimensions of the design drawings. The specific manufacturing and construction method for the steel-UHPC composite tubular structure 10 includes the following steps:

[0054] S1. The ends of the steel pipe 1 are welded to the steel plate 6;

[0055] S2 step S1 of the steel pipe 1 and the end connecting plate 6 connected to the steel structure surface is cleaned and pretreated to remove surface impurities, the surface impurities include oil and rust;

[0056] S3. The outer surface of the steel pipe 1 is welded with studs 2;

[0057] S4. Laying out the reinforcement mesh, connecting the reinforcement mesh with the stud 2;

[0058] S5 by pouring or spraying the outer side of the steel pipe 1 to obtain a UHPC outer cladding 5 combined pipe segment;

[0059] S6. Maintaining the combined pipe segment;

[0060] S7. Transporting the combined pipe segment to the construction site by vehicle and / or ship, wherein the combined pipe segment is securely fixed to the vehicle or ship to prevent displacement or sliding during transportation;

[0061] S8. Use a lifting device to lift the composite pipe segments, and sequentially connect the end connecting steel plates between adjacent composite pipe segments by welding and / or flange connection. Each composite pipe segment is connected to form a steel-UHPC composite pipe structure.

[0062] In step S5, the UHPC outer cladding 5 constructed by pouring is constructed using a structural formwork, and the structural formwork is removed after the construction of the UHPC outer cladding 5 is completed. The UHPC outer cladding 5 constructed by spraying does not require a formwork.

[0063] In step S6, when the combined pipe segments are manufactured in a prefabrication plant, high-temperature steam curing is preferably adopted; if the combined pipe segments need to be constructed on-site, film curing is preferably adopted.

[0064] To meet the design requirements of pipe piles or jacket foundations, towers and other structures of offshore wind power systems, the UHPC outer layer must have an axial compressive strength of no less than 120 MPa, an axial tensile strength of no less than 7 MPa, and a fiber volume content of no less than 2%.

[0065] The above embodiments are only preferred embodiments of the present invention, but they cannot be used as limitations of the present invention. Any modifications and improvements based on the concept of the present invention should fall within the scope of protection of the present invention. The specific scope of protection shall be subject to the claims.

Claims

1. A high-performance offshore wind power steel-UHPC composite pipe structure, comprising steel pipes and bolts, characterized by: The invention also includes a UHPC outer cladding covering the steel pipe from the outside, the outer surface of the steel pipe is welded to the stud, and the UHPC outer cladding is fixedly connected to the steel pipe through the stud. A mesh-shaped reinforcement net is further provided in the UHPC outer cladding, and the reinforcement net is connected to the stud by spot welding or binding. The steel pipe, the stud, the UHPC outer cladding and the reinforcement net constitute a steel-UHPC combined pipe structure used as a pipe pile, a jacket foundation, a tower, an anti-collision component or a mooring component.

2. The high-performance offshore wind power steel-UHPC composite pipe structure according to claim 1 is characterized in that: The steel-UHPC composite pipe structure is formed by connecting a plurality of composite pipe segments. End connecting steel plates are provided at both ends of each composite pipe segment. The end connecting steel plates are fixedly connected to the steel pipes of the composite pipe segment.

3. The high-performance offshore wind power steel-UHPC composite pipe structure according to claim 1 is characterized in that: The reinforcement mesh includes longitudinal reinforcement and transverse reinforcement. The longitudinal reinforcement is arranged along the length direction of the steel pipe, and the transverse reinforcement is arranged along the circumferential direction of the steel pipe to form an annular reinforcement. The longitudinal reinforcement and the transverse reinforcement are tied and welded to form a mesh structure.

4. The high-performance offshore wind power steel-UHPC composite pipe structure according to claim 3 is characterized by: The longitudinal reinforcements are arranged at intervals of 50 mm to 100 mm, and the transverse reinforcements are arranged at intervals of 50 mm to 100 mm.

5. The high-performance offshore wind power steel-UHPC composite pipe structure according to claim 3 is characterized by: The longitudinal reinforcement and the transverse reinforcement are steel bars and / or FRP bars.

6. The high-performance offshore wind power steel-UHPC composite pipe structure according to claim 3 is characterized by: A plurality of the studs are evenly arranged on the outer surface of the steel pipe along the length direction and the circumferential direction.

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