Fabricated steel screen-ECC combined anti-collision sheath structure and construction method thereof

Abstract

The invention discloses a fabricated steel screen-ECC combined anti-collision sheath structure and a construction method thereof.The fabricated steel screen-ECC combined anti-collision sheath structure comprises an anti-collision sheath arranged outside an offshore wind power foundation in a sleeving mode or arranged outside a wharf anti-collision mooring component in a sleeving mode, and the anti-collision sheath comprises one or more than one set of cylindrical sheath units; the cylindrical protective sleeve units are connected in a joint mode to form the anti-collision protective sleeve, and each cylindrical protective sleeve unit is of a cylindrical structure formed by splicing two semicircular protective sleeves through a connecting piece. The semicircular sheath comprises a large-hole diamond-shaped steel plate net and an ECC shell which wraps the large-hole diamond-shaped steel plate net and is made of a high-toughness cement-based composite material, a rubber pad is arranged on the inner wall face of the semicircular sheath, the two sides of the semicircular sheath are connecting ends, and seamless steel pipes are embedded in the connecting ends. The problems that an existing anti-collision facility is poor in anti-collision performance, poor in durability, not easy to replace and high in manufacturing cost are solved.

Description

Technical Field

[0001] This invention relates to the field of marine engineering protection technology, specifically to a prefabricated steel mesh-ECC combined anti-collision sleeve structure and its construction method for offshore wind power foundations or port terminals. Background Technology

[0002] With the rapid development of the marine industry, the basic structures of offshore wind power facilities (such as monopiles, jacket foundations and floating foundations), substation platform foundations, auxiliary living platform foundations, and port and wharf anti-collision mooring structures face a huge risk of being collided with ships. To ensure the safety of these expensive infrastructures and prevent environmental pollution, it is essential to set up effective anti-collision facilities.

[0003] Currently, the collision protection measures for the foundations of offshore wind power facilities, substation platforms and auxiliary living platforms, as well as port and wharf collision protection mooring structures are as follows:

[0004] 1. Applying anti-corrosion coatings, such as applying epoxy zinc-rich paint to anti-collision mooring bollards, is a convenient method, but the coating has weak wear resistance and impact resistance. It is easily damaged under friction or collision with ships, has poor durability, and requires frequent maintenance.

[0005] 2. Rubber fenders are easy to replace, but the material has limited impact resistance. Furthermore, rubber fenders are highly susceptible to ultraviolet radiation and salt spray corrosion in marine environments, and are constantly subjected to wet-dry cycle corrosion. In such harsh marine environments, they are prone to aging, have insufficient durability, short service life, and high overall cost.

[0006] 3. Welded steel skin plates, which provide protection by welding two layers of steel plates and leaving room for corrosion, have poor impact resistance and durability. Steel skin plates are expensive, and the stress mechanism between the two layers is unclear, so their long-term durability needs further verification. Furthermore, once the steel skin plate is damaged, the welded plate is extremely difficult to replace, resulting in huge repair costs. Summary of the Invention

[0007] One of the objectives of this invention is to provide a prefabricated steel mesh-ECC combined anti-collision sleeve structure, which aims to solve the problems of weak anti-collision performance, poor durability, difficulty in replacement, and high cost of existing anti-collision facilities.

[0008] The above-mentioned objectives of the present invention can be achieved through the following technical solutions.

[0009] A prefabricated steel mesh-EC composite anti-collision sleeve structure includes an anti-collision sleeve fitted onto the outside of an offshore wind power foundation or onto the outside of a port dock anti-collision mooring component. The anti-collision sleeve includes one or more cylindrical sleeve units, which are connected by joints to form the anti-collision sleeve. Each set of cylindrical sleeve units is a cylindrical structure formed by splicing two semi-circular sleeves together with connectors. The semi-circular sleeve includes a large-hole diamond-shaped steel mesh and an ECC shell made of high-toughness cement-based composite material covering the large-hole diamond-shaped steel mesh. A rubber pad is provided on the inner wall of the semi-circular sleeve. The two sides of the semi-circular sleeve are connecting ends, and seamless steel pipes are pre-embedded in the connecting ends. The connectors are anti-loosening bolt assemblies that penetrate the seamless steel pipes.

[0010] This invention relates to a prefabricated modular anti-collision sleeve structure applicable to offshore wind power facility foundations, substation platform foundations, auxiliary living platform foundations, and port dock anti-collision mooring components. For ease of explanation, the foundations of offshore wind power facilities, substation platforms, and auxiliary living platforms are collectively referred to as offshore wind power foundations. The semi-circular sleeve of this invention is prefabricated in a factory and uses a high-toughness cement-based composite material, namely ECC material, which has extremely high density and impermeability, as well as ultra-high toughness, high compressive strength, and high wear resistance. When combined with steel mesh, it forms a high-strength, high-toughness shell that effectively absorbs and disperses the impact energy of ships. Utilizing its strong resistance to chloride ion corrosion, sulfate corrosion, and freeze-thaw cycles, it solves the problems of steel corrosion and rubber aging, resulting in a long service life.

[0011] The present invention also has the following preferred designs:

[0012] The short pitch of the large-hole diamond-shaped steel mesh of the present invention is ≥50mm, and the long pitch is ≥80mm. The purpose of using the above-mentioned large-hole diamond-shaped steel mesh is to ensure that the ECC material has good fluidity and uniformity during casting, and to achieve a tight bond with the steel mesh, thereby improving the impact resistance of the overall structure.

[0013] The ECC shell of the present invention is a structure cast from a high-toughness cement-based composite material with a compressive strength ≥80MPa, flexural strength ≥25MPa, ultimate strain ≥30000 microstrain, and elastic modulus ≥25GPa. The above-mentioned preferred performance indicators ensure the long-term durability and impact resistance of the ECC material in the marine environment.

[0014] The ECC housing of the present invention has a thickness of 30mm to 60mm to ensure sufficient protective performance and structural stability.

[0015] The anti-loosening bolt assembly of the present invention is equipped with a pre-tightening nut and an anti-loosening nut, one for pre-tightening and the other for preventing loosening, ensuring the reliability and long-term stability of the connection under complex marine loads.

[0016] The cylindrical sheath units of the present invention are joined by nano-resin composite material layers to ensure the sealing of the joints and the integrity of the overall protective system.

[0017] The second objective of this invention is to provide a construction method for the above-mentioned prefabricated steel mesh-ECC combined anti-collision sleeve structure, comprising the following steps:

[0018] a. Prefabricate a semi-circular sheath and create a template for the semi-circular sheath. The template has holes for pre-embedding seamless steel pipes. The template includes an outer mold and an inner mold. The outer mold is fixed on a template support. A pre-cut large-hole diamond-shaped steel mesh is hoisted and placed inside the outer mold. The large-hole diamond-shaped steel mesh is precisely positioned using pads. Then, the inner mold is installed, and the seamless steel pipe, which serves as the pre-embedded part, is fixedly installed in the pre-drilled holes in the template. The inner mold and the outer mold are fixed together to form a closed template with a pouring port. The mixed high-toughness cement-based composite material slurry is poured into the template using its own weight pressure through a single-sided pouring method. During the pouring process, an externally attached vibrating device is used to fill all corners of the template with the high-toughness cement-based composite material slurry and to fully fill all the mesh holes of the large-hole diamond-shaped steel mesh. After the template is poured to the design strength, it is removed for curing.

[0019] b. On-site installation: Transport the prefabricated semi-circular sheaths to the site where the offshore wind power foundation or the dock anti-collision mooring component is located, wrap the two semi-circular sheaths around the outside of the offshore wind power foundation or the dock anti-collision mooring component, and fasten them together with connectors to form a set of cylindrical sheath units.

[0020] c. Multi-layer installation: A nano-resin composite material layer is evenly applied to the top surface of the lower cylindrical sheath unit. Then, two semi-circular sheaths are hoisted and their positions are adjusted to press the nano-resin composite material layer. Then, they are fastened together with connectors to form a new set of cylindrical sheath units. Multiple sets of cylindrical sheath units are joined and installed from bottom to top along the height direction of the offshore wind power foundation or dock anti-collision mooring component to form a combined anti-collision sheath structure.

[0021] d. Joint treatment: At the joint between two adjacent sets of cylindrical sheath units, nano-resin composite material is used to fill and seal the joint using the grouting method to make the joint smooth.

[0022] Because the semi-circular sheath of this invention can be prefabricated in the factory, only assembly and joint treatment are required on site, resulting in fast construction speed and low requirements for the offshore operation window. The cost of ECC material is lower than that of steel skin plates and rubber fenders, resulting in a lower overall cost.

[0023] The present invention also has the following preferred construction methods:

[0024] In step a of the present invention, the removal of the template for the semi-circular sheath and its curing includes spraying a curing agent for static curing and high-temperature steam curing. The spraying of the curing agent for static curing involves spraying the curing agent onto the outer surface of the semi-circular sheath after removing the template and allowing it to sit for 12 hours.

[0025] Then, the high-temperature steam curing is carried out. The high-temperature steam curing involves sending the semi-circular sheath into a steam curing kiln and curing it at 70-90°C. The curing method of the present invention can accelerate the development of the ECC shell strength and the stability of its performance. The steam curing time should be adjusted according to the performance requirements of the ECC material, generally 48-72 hours.

[0026] After the high-temperature steam curing of the semi-circular sheath in the steam curing kiln is completed, a rubber pad is evenly adhered to the inner surface of the semi-circular sheath using epoxy resin. A scraper and roller are used to scrape and press, ensuring the epoxy resin is evenly distributed and the rubber pad is flat. The rubber pad is used to contact the outer wall of offshore wind turbine foundations or dock anti-collision mooring components, providing collision protection.

[0027] In step a of this invention, before the high-toughness cement-based composite slurry is poured into the mold, a release agent and an antifoaming agent are applied to the inner wall surface of the mold to ensure that the surface of the finished ECC shell is smooth and free of air bubbles. The application should evenly cover the entire pouring contact surface to avoid missed areas and accumulation.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Modular and replaceable: The semi-circular sheath adopts a segmented modular design, which is connected by high-strength bolts to form a cylindrical sheath unit. No welding is required. If damaged, the damaged module can be quickly replaced, which greatly reduces maintenance costs and downtime and improves maintenance efficiency.

[0030] 2. Excellent impact resistance and wear resistance: The core ECC material used has ultra-high toughness, high compressive strength and high wear resistance. When combined with steel mesh, it forms a high-strength and high-toughness shell, which can effectively absorb and disperse the impact energy of ships, protect the internal basic structure and significantly improve the protective performance.

[0031] 3. Excellent durability: The ECC material used has extremely high density and impermeability, and is highly resistant to chloride ion corrosion, sulfate corrosion, and freeze-thaw cycles. It fundamentally solves the problems of steel corrosion and rubber aging, and significantly extends the service life.

[0032] 4. Excellent fire and water resistance: ECC material is an inorganic material, which is non-combustible and has excellent fire resistance; its high impermeability also ensures the overall waterproof effect, further enhancing the reliability of the protection system.

[0033] 5. Convenient construction and economical cost: The semi-circular sheath is prefabricated in the factory, ensuring quality control. On-site installation only requires assembly and joint treatment, resulting in fast construction speed and low requirements for offshore operation windows. Furthermore, material costs are lower than those of steel skin plates and rubber fenders, leading to a lower overall cost and significant economic advantages.

[0034] 6. Clear stress distribution: The steel mesh acts as a reinforcing skeleton, working in conjunction with the ECC shell. The stress distribution mechanism is clear, the reliability is high, and the long-term stable operation of the protection system is ensured. Attached Figure Description

[0035] Figure 1 This is a cross-sectional structural schematic diagram of the prefabricated steel mesh-ECC combined anti-collision sleeve structure of the present invention in use.

[0036] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of a set of cylindrical sheath units in use in the embodiment;

[0037] Figure 3 It is a half-section diagram of multiple sets of cylindrical sheath units that are joined and installed from bottom to top;

[0038] Figure 4 yes Figure 3 A half-sectional schematic diagram of the connection structure between the two sets of cylindrical sheath units;

[0039] Figure 5 This is a schematic diagram of the cross-sectional structure of a semi-circular sheath in one embodiment;

[0040] Figure 6 This is a schematic diagram of the cross-sectional structure of a molded large-hole rhomboid steel mesh in one embodiment;

[0041] Figure 7 yes Figure 6 A schematic diagram of the planar mesh structure of a large-aperture diamond-shaped steel plate mesh;

[0042] Figure 8 This is a schematic diagram of the longitudinal cross-sectional structure of a seamless steel pipe in the embodiment;

[0043] Figure 9 yes Figure 8A schematic diagram of the cross-sectional structure of a seamless steel pipe.

[0044] Explanation of reference numerals in the attached drawings: 1. Semi-circular sheath; 1a. Large-aperture diamond-shaped steel mesh; 1b. ECC shell; 1c. Connecting end; 2. Rubber pad; 3. Dock anti-collision mooring component; 4. Connector; 4a. Bolt; 4b. Nut; 5. Nano-resin composite material layer; 6. Seamless steel pipe. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] In the description of this invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Example

[0048] This embodiment uses a combined anti-collision sleeve structure for port dock anti-collision mooring components as an example to illustrate the technical content of the present invention in detail. Please refer to [link / reference]. Figures 1 to 9 A prefabricated steel mesh-ECC combined anti-collision sleeve structure includes an anti-collision sleeve fitted on the outside of the dock anti-collision mooring component 3. The anti-collision sleeve includes one or more cylindrical sleeve units. The cylindrical sleeve units are connected by joints to form the anti-collision sleeve. Each set of cylindrical sleeve units is a cylindrical structure formed by two semi-circular sleeves 1 spliced ​​together by connectors 4. The semi-circular sleeve 1 includes a large-hole diamond steel mesh 1a and an ECC shell 1b made of high-toughness cement-based composite material covering the outside of the large-hole diamond steel mesh 1a. A rubber pad 2 is provided on the inner wall surface of the semi-circular sleeve 1. The two sides of the semi-circular sleeve 1 are connecting ends 1c. Seamless steel pipes 6 are pre-embedded in the connecting ends 1c. The connectors 4 are anti-loosening bolt assemblies that penetrate the seamless steel pipes 6.

[0049] As a preferred embodiment, the short pitch of the large-hole diamond steel mesh 1a is ≥50mm, and the long pitch of the large-hole diamond steel mesh 1a is ≥80mm. The purpose of using the above-mentioned large-hole diamond steel mesh is to ensure that the ECC material has good fluidity and uniformity during casting, and to achieve a tight bond with the steel mesh, thereby improving the impact resistance of the overall structure.

[0050] As a preferred embodiment, the ECC shell 1b is a structure cast from a high-toughness cement-based composite material with a compressive strength ≥80MPa, flexural strength ≥25MPa, ultimate strain ≥30000 microstrain, and elastic modulus ≥25GPa. The above-mentioned preferred performance indicators ensure the long-term durability and impact resistance of the ECC material in the marine environment.

[0051] In a preferred embodiment, the thickness of the ECC housing 1b is 30mm to 60mm, the large-hole diamond-shaped steel mesh 1a is embedded in the middle of the ECC housing 1b, and the thickness of the protective layer is 20mm to 30mm to ensure sufficient protective performance and structural stability.

[0052] As a preferred embodiment, the anti-loosening bolt assembly consists of a bolt 4a and a nut 4b, equipped with a pre-tightening nut and an anti-loosening nut, one for pre-tightening and the other for preventing loosening, ensuring the reliability and long-term stability of the connection under complex marine loads.

[0053] In a preferred embodiment, the cylindrical sheath units are joined by a nano-resin composite material layer, and a nano-resin composite material layer 5 is formed at the joint between the upper and lower cylindrical sheath units to ensure the sealing of the joint and the integrity of the overall protection system.

[0054] The construction method for the above-mentioned prefabricated steel mesh-ECC combined anti-collision sleeve structure includes the following steps:

[0055] a. A prefabricated semi-circular sheath 1 is constructed. A template for the semi-circular sheath is designed and manufactured. Holes for pre-embedding seamless steel pipes 6 are opened on the template. The template includes an outer mold and an inner mold. The outer mold is fixed on a template support. A pre-cut large-hole diamond-shaped steel mesh 1a is hoisted and placed inside the outer mold. The large-hole diamond-shaped steel mesh 1a is precisely positioned using pads. Then, the inner mold is installed. The seamless steel pipe 6, which serves as the pre-embedded part, is fixedly installed in the pre-opened hole of the template. The inner mold and the outer mold are fixed together to form a closed template with a pouring port. The mixed high-toughness cement-based composite material slurry is poured into the template using its own weight pressure through a single-sided pouring method. During the pouring process, the high-toughness cement-based composite material slurry is filled into every corner of the template through an externally attached vibrating device, and each mesh hole of the large-hole diamond-shaped steel mesh 1a is fully filled. After the template is poured to the design strength, it is removed for curing.

[0056] b. On-site installation: Transport the prefabricated semi-circular sheath 1 to the site where the dock anti-collision mooring component 3 is located, wrap the two semi-circular sheaths 1 around the outside of the dock anti-collision mooring component 3, and fasten them together with connectors 4 to form a set of cylindrical sheath units.

[0057] c. Multi-layer installation: Apply nano-resin composite material layer 5 evenly to the top surface of the lower cylindrical sheath unit, then hoist two semi-circular sheaths 1 and adjust their positions to press the nano-resin composite material layer 5, and then fasten them together through connectors 4 to form a new set of cylindrical sheath units. Connect and install multiple sets of the cylindrical sheath units from bottom to top along the height direction of the dock anti-collision mooring component 3 to form a combined anti-collision sheath structure.

[0058] d. Joint treatment: At the joint between two adjacent sets of cylindrical sheath units, nano-resin composite material is used to fill and seal the joint using the grouting method to make the joint smooth.

[0059] The construction method of the present invention will be further described in detail below.

[0060] In a preferred embodiment, a construction method for a prefabricated steel mesh-ECC combined anti-collision sleeve structure includes the following steps:

[0061] 1. Template Fabrication and Preparation: A specialized steel template for the semi-circular sheath 1 is fabricated according to the design dimensions. The template consists of an inner mold and an outer mold. Both the inner and outer molds are made of high-strength steel to ensure the structural strength and durability of the template. Precise positioning and drilling are performed on the template to correspond to the bolt holes of the connecting components, for pre-embedding seamless steel pipes 4, ensuring the accuracy and reliability of the template.

[0062] 2. Apply release agent: Clean the inner wall surface of the template, and then apply release agent and defoamer to the inner wall surface of the template to ensure that the finished product surface is smooth and free of bubbles. When applying, the entire casting contact surface should be evenly covered to avoid missed areas and accumulation.

[0063] 3. Install the outer mold: Install and secure the steel outer mold with the semi-circular opening facing upwards. Use dedicated fixing devices (such as bolts or clips) to fix the outer mold to the formwork support to ensure that the outer mold will not shift during the pouring process.

[0064] 4. Install large-hole diamond steel mesh: Hoist the pre-cut large-hole diamond steel mesh into the inner side of the outer mold, and use shims and other tools for precise positioning to ensure that the steel mesh is accurately positioned in the ECC shell 1b and that the protective layer thickness meets the design requirements (the protective layer is usually 20mm to 30mm).

[0065] 5. Install the inner mold: Install and fix the steel inner mold so that the inner mold and the outer mold form a closed template.

[0066] 6. Mixing ECC Material: Mix the ECC material according to the mixing ratio, strictly controlling the water-cement ratio and mixing process. The ECC material mixing ratio should be verified in the laboratory to ensure its high-performance characteristics. Dedicated mixing equipment should be used to ensure the mixture has high fluidity and uniformity to meet casting requirements. The mixing time should be adjusted according to the material properties.

[0067] 7. Embedded seamless steel pipe: The seamless steel pipe 6, which is used as an embedded part, is installed into the pre-drilled hole on the template and fixed to prevent displacement during the pouring process.

[0068] 8. Casting and Molding: Select a suitable pouring port on the top of the outer mold and pour the mixed ECC slurry into the mold using a single-sided pouring method. During the pouring process, an attached vibratory compactor can be used to ensure that the slurry fills all corners of the mold, especially ensuring that the mesh of the large-aperture diamond-shaped steel mesh 1a is fully filled with ECC material. Avoid over-vibration during compaction to prevent damage to the uniformity of the ECC material. After pouring, immediately check the sealing of the mold and the filling of the slurry to ensure the quality of the pouring.

[0069] 9. Demolding: Under standard curing conditions, once the ECC material strength has developed to over 30 MPa, demolding can proceed. The demolding sequence is to first remove the inner mold, then carefully remove the outer mold. Specialized tools should be used during demolding to avoid damaging the ECC shell. After demolding, the surface quality and dimensional accuracy of the ECC shell should be immediately checked to ensure it meets design requirements.

[0070] 10. Curing: Immediately after demolding, spray a curing agent onto the outer surface of the ECC shell of the semi-circular sheath 1 and allow it to cure statically in the workshop for 12 hours. Then, place the semi-circular sheath 1 into a steam curing kiln for high-temperature steam curing, controlling the curing temperature at 70–90℃ to accelerate the development of ECC material strength and stabilize its performance. The steam curing time should be adjusted according to the performance requirements of the ECC material, typically 48–72 hours.

[0071] 11. Applying Rubber Pads: After steam curing, the semi-circular sheath 1 is removed from the steam curing kiln. Rubber pads 3 are evenly applied to its inner surface using epoxy resin. The application of rubber pads 3 should ensure flatness and adhesive strength. A dedicated scraper and roller are used to ensure even distribution of the epoxy resin. After application, a quality inspection should be performed to ensure a tight bond between the rubber pads and the sheath unit.

[0072] 12. Transportation: The finished cylindrical sheath units, composed of semi-circular sheaths, shall be transported to the site of the dockside anti-collision mooring components. Protective measures shall be taken during transportation to prevent damage to the cylindrical sheath units. Transport vehicles shall be equipped with dedicated securing devices to ensure the stability of the sheath units during transport.

[0073] 13. On-site Measurement: Use precision instruments to re-measure the outer diameter of the dockside anti-collision mooring components (such as steel pipe piles) to be protected, ensuring they match the inner diameter of the cylindrical sheath unit. High-precision measuring tools should be used during measurement, with errors controlled within ±3mm. The re-measurement results should be compared with the design drawings to ensure they meet the installation requirements.

[0074] 14. Installation: After verifying that the error meets the requirements, first install the bottommost first set of cylindrical sheath units. Wrap the two semi-circular sheaths around the outside of the dock's anti-collision mooring structure, insert anti-loosening high-strength bolts, and tighten them with two nuts. A dedicated torque wrench should be used during installation to ensure the bolt preload meets design requirements. After installation, a quality inspection should be conducted to ensure the installation's firmness and reliability.

[0075] 15. Joint Treatment: Apply a uniform layer of high-performance nano-resin composite material (using the grouting method) to the top surface of the first set of cylindrical sheath units. Then, hoist and install the semi-circular sheath of the second set of cylindrical sheath units, pressing it tightly against the nano-resin composite material layer and adjusting its position. Finally, secure it with bolted connections. Joint treatment should ensure its sealing and flatness, using a specialized scraper and roller to ensure uniform distribution of the nano-resin composite material. After joint treatment, a quality inspection should be conducted to ensure the sealing of the joints and the integrity of the overall protective system.

[0076] 16. Surface Repair: Use a scraper to smooth out any excess nano-resin composite material extruded from the joint between the two sets of cylindrical sheath units, ensuring a smooth and sealed surface. Specialized tools should be used during repair to ensure quality. After repair, a quality inspection should be conducted to ensure the smoothness and sealing of the joint.

[0077] 17. Repeated installation: Following the above method, install the remaining cylindrical sheath units sequentially from bottom to top until the designed height is reached, ultimately forming a complete and continuous protection system.

[0078] 18. Quality Inspection: After installation, a comprehensive inspection of the entire protective system shall be conducted. The inspection shall include the secure installation of the sheath, the sealing of the joints, and the flatness of the surface. Specialized tools and equipment shall be used during the inspection to ensure the accuracy of the results. After the inspection, a detailed inspection report shall be prepared, recording the results and any problems found, and corrective actions shall be taken promptly.

[0079] The prefabricated steel mesh-ECC combined anti-collision sleeve structure of the present invention is also applicable to the pile collision protection of offshore wind power foundations, wherein the offshore wind power foundations include the foundation structure of offshore wind power facilities as well as the foundation of the booster station platform and the foundation of the auxiliary living platform.

[0080] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A prefabricated steel mesh-ECC combined anti-collision sleeve structure, comprising an anti-collision sleeve fitted onto the outside of an offshore wind power foundation or onto the outside of a dock anti-collision mooring component, characterized in that: The anti-collision sleeve includes one or more cylindrical sleeve units. The cylindrical sleeve units are connected by joints to form the anti-collision sleeve. Each set of cylindrical sleeve units is a cylindrical structure formed by splicing two semi-circular sleeves (1) together by connectors (4). The semi-circular sleeve (1) includes a large-hole diamond steel plate mesh (1a) and an ECC shell (1b) made of high-toughness cement-based composite material covering the outside of the large-hole diamond steel plate mesh (1a). A rubber pad (2) is provided on the inner wall surface of the semi-circular sleeve (1). The two sides of the semi-circular sleeve (1) are connecting ends (1c). Seamless steel pipes (6) are pre-embedded in the connecting ends (1c). The connectors (4) are anti-loosening bolt assemblies that penetrate the seamless steel pipes (6).

2. The prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 1, characterized in that: The short pitch of the large-hole diamond-shaped steel plate mesh (1a) is ≥50mm, and the long pitch of the large-hole diamond-shaped steel plate mesh is ≥80mm.

3. The prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 2, characterized in that: The ECC shell (1b) is a structure cast from a high-toughness cement-based composite material with a compressive strength ≥80MPa, flexural strength ≥25MPa, ultimate strain ≥30000 microstrain, and elastic modulus ≥25GPa.

4. The prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 3, characterized in that: The thickness of the ECC housing (1b) is 30mm to 60mm.

5. The prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 1, characterized in that: The anti-loosening bolt assembly is equipped with a preload nut and an anti-loosening nut.

6. The prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 1, characterized in that: The cylindrical sheath units are connected by a nano-resin composite material layer (5).

7. A construction method for a prefabricated steel mesh-ECC combined anti-collision sleeve structure as described in any one of claims 1 to 6, characterized in that, Includes the following steps: a. Prefabricate a semi-circular sheath (1), and make a template for the semi-circular sheath (1). The template has holes for pre-embedding seamless steel pipes (6). The template includes an outer mold and an inner mold. The outer mold is fixed on the template support. The pre-cut large-hole diamond steel mesh (1a) is hoisted and placed inside the outer mold. The large-hole diamond steel mesh (1a) is precisely positioned using pads. Then, the inner mold is installed. The seamless steel pipe (6) used as a pre-embedded part is fixedly installed in the hole pre-opened in the template. The inner mold and the outer mold are fixed together to form a closed template with a pouring port. The mixed high-toughness cement-based composite material slurry is poured into the template using its own weight pressure by using a single-sided pouring method. During the pouring process, the high-toughness cement-based composite material slurry is filled into all corners of the template by externally attached vibrating equipment, and the mesh holes of the large-hole diamond steel mesh (1a) are fully filled. After pouring and molding to the design strength, the template is removed for curing. b. On-site installation: transport the prefabricated semi-circular sheath (1) to the site where the offshore wind power foundation or the dock anti-collision mooring component is located, wrap the two semi-circular sheaths (1) around the outside of the offshore wind power foundation or the dock anti-collision mooring component, and fasten them together with connectors (4) to form a set of cylindrical sheath units. c. Multi-layer installation: Apply a nano-resin composite material layer (5) evenly to the top surface of the lower cylindrical sheath unit, then hoist two semi-circular sheaths (1) and adjust their positions to press the nano-resin composite material layer (5), and then fasten them together with connectors (4) to form a new set of cylindrical sheath units. Multiple sets of the cylindrical sheath units are joined and installed from bottom to top along the height direction of the offshore wind power foundation or dock anti-collision mooring components to form a combined anti-collision sheath structure. d. Joint treatment: At the joint between two adjacent sets of cylindrical sheath units, nano-resin composite material is used to fill and seal the joint using the grouting method to make the joint smooth.

8. The construction method of the prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 7, characterized in that, The removal of the template for the semi-circular sheath (1) in step a includes curing by spraying curing agent and curing by high-temperature steam. The curing by spraying curing agent is to spray curing agent on the outer surface of the semi-circular sheath (1) after removing the template and then curing for 12 hours. Then, the high-temperature steam curing is carried out, which involves sending the semi-circular sheath (1) into the steam curing kiln and curing it at 70-90°C for 48-72 hours.

9. The construction method of the prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 8, characterized in that, After the semi-circular sheath (1) exits the steam curing kiln and the high-temperature steam curing is completed, a rubber pad is evenly pasted on the inner surface of the semi-circular sheath using epoxy resin. A scraper and roller are used to scrape and press to ensure that the epoxy resin is evenly distributed and to ensure the flatness of the rubber pad.

10. The construction method of the prefabricated steel mesh-ECC combined anti-collision sleeve structure according to claim 7, characterized in that, In step a, before the high-toughness cement-based composite slurry is poured into the mold, a release agent and a defoamer are applied to the inner wall surface of the mold.

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