A erosion-resistant combined offshore wind power foundation

Abstract

The present invention discloses an anti-corrosion combined offshore wind power foundation, comprising a concrete base, the outer side of the concrete base is coated with a perforated sieve steel cylinder, the outer side of the perforated sieve steel cylinder is coated with a steel cylinder, the outer side of the steel cylinder is coated with a CFRP cloth coating layer, the outer layer of the CFRP cloth coating layer is coated with a mortar coating, and the concrete of the concrete base also needs to add an anti-corrosion and anti-erosion agent, and the components of the anti-erosion agent are wollastonite, plasticizer, lightly burned magnesium oxide and silicon-aluminum material. The present invention utilizes a perforated sieve steel cylinder to enhance the bonding strength between the internal concrete and the outer steel cylinder, which is beneficial to the transmission of shear force and improves the advantage of the joint load-bearing of the two, and smears mortar on the surface of the extremely corrosion-resistant CFRP cloth for protection, which is used to isolate the CFRP cloth from contact with seawater, which can greatly improve the anti-erosion property of the wind power foundation while ensuring the bearing performance of the wind power foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion of offshore wind power foundations, and in particular to an anti-corrosion combined offshore wind power foundation. Background Art

[0002] In recent years, with the gradual acceleration of offshore wind energy resource development, offshore wind turbines have also had broad application prospects. However, according to the ISO-12944 typical corrosion environment classification table, it can be seen that the ocean is the most corrosive environment. The salt content of seawater is generally around 3%, and the pH value is between 7.9 and 8.4. It is a natural strong electrolyte solution. Therefore, offshore wind power foundations face the test of marine corrosion environment.

[0003] At present, most offshore wind power foundations are reinforced concrete structures. Chloride ions and sulfate ions in the marine system have a strong corrosive effect on concrete. Chloride ions diffuse into the concrete and have a special ability to destroy the oxide film on the surface of the steel bars. They will produce soluble ferric chloride, which will cause the steel bars inside the concrete to generate hydrous iron oxide (rust). The expansion reaction of rust will cause the concrete above the rusted steel bars to crack and peel off. These are all due to the high salinity, strong electrolytic ability, dissolved oxygen and the presence of organisms, which cause the wind turbine foundation exposed to the marine environment to undergo electrochemical reactions with the surrounding medium and suffer severe corrosion. Therefore, there is a need for an anti-corrosion combined offshore wind power foundation that can improve the corrosion resistance of the foundation and thus ensure the service life of the wind turbine. Summary of the invention

[0004] The purpose of the present invention is to provide a erosion-resistant combined offshore wind power foundation to solve the problems existing in the above-mentioned prior art, and to greatly improve the erosion resistance of the wind power foundation while ensuring the bearing performance of the wind power foundation.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides an anti-corrosion combined offshore wind power foundation, including a concrete base, the outer side of the concrete base is coated with a perforated sieve steel cylinder, the outer side of the perforated sieve steel cylinder is coated with a steel cylinder, the outer side of the steel cylinder is coated with a CFRP cloth coating layer, the outer layer of the CFRP cloth coating layer is coated with a mortar coating, the concrete of the concrete base includes an anti-corrosion and anti-erosion agent, and the components of the anti-erosion agent are wollastonite, plasticizer, lightly burned magnesium oxide and silicon-alumina material.

[0006] Preferably, the bottom structure of the concrete base is circular, and a hollow circular hole is opened in the middle of the concrete base.

[0007] Preferably, the outer side of the steel cylinder is galvanized.

[0008] Preferably, the CFRP cloth coating layer is composed of multiple layers of CFRP cloth wound on the outer side wall of the steel cylinder, and the CFRP cloth is composed of high-strength carbon fiber and a matrix material binder.

[0009] Preferably, the overlap length of the CFRP cloth is 3 cm to 5 cm, and two adjacent layers of CFRP cloth are fixedly connected.

[0010] Preferably, two adjacent layers of CFRP cloth are fixedly connected by epoxy resin.

[0011] Preferably, the silicon-aluminum material comprises Al2O3 and SiO2.

[0012] Preferably, the plasticizer is a melamine-based water reducer.

[0013] Preferably, a plurality of circular holes are provided in the circumferential direction of the wall of the perforated screen type steel cylinder.

[0014] Preferably, the components of the anti-corrosion agent are as follows by mass percentage: wollastonite 70%-80%, plasticizer 0.5%-6%, light-burned magnesia 8%-10%, and silicon-alumina material 30%-35%.

[0015] The present invention discloses the following technical effects: the present invention utilizes a perforated screen steel cylinder to enhance the bonding strength between the inner concrete and the outer steel cylinder, which is beneficial to the transmission of shear force, improves the advantage of the joint force of the two, and increases the bearing capacity of the foundation. Mortar is applied on the surface of the highly corrosion-resistant CFRP cloth for protection to isolate the CFRP cloth from contact with seawater, which can greatly improve the corrosion resistance of the wind power foundation while ensuring that the wind power foundation has a high bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic diagram of the structure of the erosion-resistant combined offshore wind power foundation;

[0018] Figure 2 for Figure 1 AA direction cross-sectional view;

[0019] Figure 3 It is a structural schematic diagram of a perforated screen steel cylinder;

[0020] In the figure: concrete base 1, perforated screen steel cylinder 2, steel cylinder 3, CFRP cloth covering layer 4, mortar coating 5. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1-3 The present invention provides an anti-corrosion combined offshore wind power foundation, including a concrete base 1, the outer side of the concrete base 1 is coated with a perforated screen steel cylinder 2, the outer side of the perforated screen steel cylinder 2 is coated with a steel cylinder 3, the outer side of the steel cylinder 3 is coated with a CFRP cloth coating layer 4, the outer layer of the CFRP cloth coating layer 4 is coated with a mortar coating 5, the concrete of the concrete base 1 includes an anti-corrosion and anti-erosion agent, the components of the anti-erosion agent are wollastonite, plasticizer, light-burned magnesium oxide and silicon-aluminum material, wollastonite can improve the homogeneity of concrete, and the needle-like structure fills the capillary pores of concrete to make it dense and make it difficult for corrosive substances to enter the interior of the concrete.

[0024] A further optimization scheme is that the bottom structure of the concrete base 1 is circular, and a hollow circular hole is opened in the middle of the concrete base 1 for placing the tower. When making the concrete base 1, it is necessary to select well-graded coarse and fine aggregates, that is, the aggregate should contain a proportion of different coarse and fine particles, so as to improve the density of the concrete and reduce the continuous capillary pores inside the concrete. The concrete base 1 needs to be cast in advance on land, and the prefabricated foundation is launched into water by a semi-submersible barge so that the foundation bears a certain buoyancy, and then is hoisted on the seabed surface covered with a gravel cushion layer by a floating crane.

[0025] A further optimized solution is that the outer side of the steel cylinder 3 is galvanized so that a primary cell is formed between the steel cylinder and the galvanized layer during use, thereby utilizing the cathodic protection method to prevent corrosion of the steel cylinder. The specific galvanizing method is a fast and pollution-free galvanizing method, that is, a sliding friction treatment method is utilized to quickly obtain a galvanized layer on the surface of the steel cylinder 3. When a loaded zinc ball slides and rubs up and down on the steel cylinder 3, the zinc ball wears. Under the action of friction, the zinc in the zinc ball is continuously cold-welded to the surface of the steel cylinder 3 to form a mechanical bite or metallurgical bond. Therefore, the sliding friction process is repeated multiple times to obtain a galvanized layer on the surface of the metal plate.

[0026] A further optimized solution is that the CFRP cloth coating 4 is composed of multiple layers of CFRP cloth wrapped on the outer wall of the steel cylinder 3, multiple layers of CFRP cloth coating are wrapped on the outside of the steel cylinder 3, each layer of CFRP cloth coating 4 is composed of a layer of CFRP cloth wrapped on the outer wall of the steel cylinder, the CFRP cloth is arranged along the circumferential direction of the wrapped gravity foundation structure, and the innermost CFRP cloth coating and the steel cylinder 3 and the two adjacent layers of the CFRP cloth coating 4 are fastened and connected by bonding, the CFRP cloth is composed of high-strength carbon fiber and a matrix material binder, the matrix material is a thermosetting resin-based composite material, which is composed of epoxy resin and furan resin and has the characteristics of corrosion resistance.

[0027] According to a further optimized solution, the overlap length of the CFRP cloth joint is 3 cm to 5 cm, and the two adjacent layers of CFRP cloth are fixedly connected. The solution is light in weight, easy to construct, and more durable and corrosion-resistant than reinforced concrete.

[0028] To further optimize the solution, two adjacent layers of CFRP cloth are fixedly connected by epoxy resin to increase firmness.

[0029] According to a further optimization scheme, the silicon-aluminum material preferably has Al2O3 and SiO2 as main active ingredients, which can reduce the creep of concrete and improve the concrete's impermeability and durability.

[0030] According to a further optimization scheme, the plasticizer is a melamine-based water reducer, which is a product of melamine sulfonated with sulfuric acid and then condensed with formaldehyde, and can greatly improve the strength of the mortar.

[0031] Further optimization scheme, the perforated screen steel cylinder 2 is provided with a plurality of circular holes in the circumferential direction of the cylinder wall, which is a steel cylinder structure with circular holes opened in local sections of the cylinder wall surface at intervals, which can enhance the bonding strength between the internal concrete and the outer steel cylinder, and is conducive to the transmission of shear force, so that the two are subjected to force together, and the bearing capacity of the foundation is increased. The perforated screen steel cylinder 2 is made by two processes, straight seam welding and rotary welding, by opening circular holes in sections on the cylinder wall of the welded steel cylinder.

[0032] According to a further optimization scheme, the components of the anti-corrosion agent are, by mass percentage, 70%-80% wollastonite, 0.5%-6% plasticizer, 8%-10% light-burned magnesia, and 30%-35% silicon-aluminum material, preferably 75% wollastonite, 5% plasticizer, 9% light-burned magnesia, and 31% silicon-aluminum material, thereby improving the density of the concrete and increasing the corrosion resistance.

[0033] The construction method of the erosion-resistant combined offshore wind power foundation of the present invention comprises the following steps:

[0034] Step 1: The overall foundation structure is prefabricated on land, the perforated screen steel cylinder 2 and the steel cylinder 3 are firmly connected, and then the concrete base 1 is poured therein and sealed.

[0035] Step 2: Treat the outer surface of the steel cylinder 3; first, carefully clean and grind the base surface with a grinding wheel, then rinse the surface with clean water and wait for it to dry fully.

[0036] Step 3: Press a zinc ball with a load of 500N to 900N onto the steel cylinder 3, and control the steel cylinder 3 to reciprocate along the X direction so that the zinc ball slides and rubs on the surface of the steel cylinder 3. When the steel cylinder 3 reciprocates once along the X direction, control the steel cylinder 3 to translate 200μm to 800μm along the Y direction and then reciprocate along the X direction. Continue to move until the surface of the steel cylinder 3 completes a sliding friction process. Repeat the sliding friction process 20 to 90 times, and finally obtain a zinc coating on the surface of the steel cylinder 3.

[0037] Step 4: Apply epoxy resin primer on the surface of the galvanized layer, and paste CFRP cloth on the galvanized layer. The cutting length of the CFRP cloth each time should be 3cm to 5cm larger than the outer circle size of the steel cylinder 3, which is used for overlapping the splicing of the CFRP cloth. The two adjacent layers of the CFRP cloth coating 4 are glued together by epoxy resin.

[0038] Step 5: After all the CFRP sheets have been pasted, use polyethylene sheets for maintenance; finally, apply mortar protection treatment on the surface of the CFRP sheets to isolate the CFRP sheets from contact with seawater, thereby maximizing the erosion resistance of the wind power foundation. At this point, the erosion-resistant modular offshore wind power foundation is completed.

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An anti-corrosion combined offshore wind power foundation, characterized in that: The invention comprises a concrete base (1), wherein the outer side of the concrete base (1) is coated with a mesh steel cylinder (2), the outer side of the mesh steel cylinder (2) is coated with a steel cylinder (3), the outer side of the steel cylinder (3) is coated with a CFRP cloth coating layer (4), the outer layer of the CFRP cloth coating layer (4) is coated with a mortar coating (5), and the concrete of the concrete base (1) includes an anti-corrosion and anti-corrosion agent, and the components of the anti-corrosion agent are wollastonite, a plasticizer, lightly burned magnesium oxide and a silicon-aluminum material; The bottom structure of the concrete base (1) is circular, and a hollow circular hole is provided in the middle of the concrete base (1); The CFRP cloth coating layer (4) is composed of multiple layers of CFRP cloth wound on the outer wall of the steel cylinder (3), and the CFRP cloth is composed of high-strength carbon fibers and a matrix material binder; The matrix material is a thermosetting resin-based composite material, which is composed of epoxy resin and furan resin; The perforated screen steel cylinder (2) has a plurality of circular holes formed in the circumferential direction of the cylinder wall; The components of the anti-corrosion agent are as follows by mass percentage: 70%-80% wollastonite, 0.5%-6% plasticizer, 8%-10% light-burned magnesia, and 30%-35% silicon-aluminum material.

2. The erosion-resistant combined offshore wind power foundation according to claim 1 is characterized in that: The outer side of the steel cylinder (3) is galvanized.

3. The erosion-resistant combined offshore wind power foundation according to claim 1 is characterized in that: The overlapping length of the CFRP cloth is 3 cm to 5 cm, and two adjacent layers of CFRP cloth are fixedly connected.

4. The erosion-resistant combined offshore wind power foundation according to claim 3 is characterized by: The two adjacent layers of CFRP cloth are fixedly connected by epoxy resin.

5. The erosion-resistant combined offshore wind power foundation according to claim 1 is characterized in that: The silicon-aluminum material comprises Al2O3 and SiO2.

6. The erosion-resistant combined offshore wind power foundation according to claim 1 is characterized by: The plasticizer is a melamine-based water reducer.

Images