Manufacturing method of anti-cracking concrete floating type fan platform

Abstract

The invention discloses a method for manufacturing an anti-cracking concrete floating type fan platform, which comprises the following steps of: binding steel bars on the side wall of a ballast tank, the side wall of a main column and the side wall of a buoy respectively, connecting the steel bars, performing concrete pouring and integral forming, and ensuring that the wall thickness of the whole structure is at least 50cm; two dry cabin steel strand groups are evenly distributed in the side wall of the main column in the circumferential direction of the main column in an embedded mode, so that two-section type tensioning is formed in a variable-diameter bending area of the main column. Meanwhile, a plurality of uniformly distributed steel strands are pre-buried in each wall surface of the ballast tank, so that two ends of each steel strand respectively penetrate into the buoy and the main column and are respectively assembled with the anchor seat, and a sacrificial anode is arranged near the anchor seat in the buoy. According to the method, the characteristic that conventional concrete is not pressed when being pulled is solved, so that the concrete platform does not have surface cracking under the impact of extreme and fatigue loads, the problem that a conventional concrete floating body cracks under the action of offshore wind turbines and wave loads is effectively solved, and meanwhile, the method has the cost advantage.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore floating wind turbines, and in particular relates to a method for manufacturing a crack-resistant concrete floating wind turbine platform. Background Art

[0002] With the development of deep-sea offshore wind power, fixed wind turbine foundations are becoming increasingly unsuitable for deepwater applications. Floating wind turbines, however, are not restricted by water depth and have better adaptability, making them suitable for deepwater applications. Concrete is less expensive than steel and has a high potential for promotion. However, floating offshore wind turbines are subject to complex loads, not only extreme loads but also fatigue loads from the turbine and waves. Conventional reinforced concrete floating structures, due to their inherent "compression-resistant" nature, are susceptible to cracking and corrosion of the steel bars under extreme and fatigue loads, accelerating their fracture. Seawater can even enter the ballast tanks, destabilizing the float and causing it to capsize and potentially cause accidents. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and propose a method for manufacturing a crack-resistant concrete floating wind turbine platform. The crack-resistant concrete floating wind turbine platform manufactured can effectively solve the problem of conventional concrete floating bodies cracking due to offshore wind turbines and wave loads, and at the same time has cost advantages.

[0004] The object of the present invention is achieved through the following technical solutions: a method for manufacturing a crack-proof concrete floating wind turbine platform, the concrete floating wind turbine platform comprising a main column, a ballast tank and a buoy, wherein a plurality of ballast tanks are evenly distributed around the main column and connected to the main column, each ballast tank is connected to a buoy, and the main column is a variable diameter main column. The method comprises tying steel bars on the side walls of the ballast tank, the side walls of the main column and the side walls of the buoy, and connecting the steel bars, and then pouring concrete to form an integral structure, and ensuring that the wall thickness of the overall structure is at least 50 cm; wherein, Two groups of dry tank steel strands are pre-buried in the side walls of the main column and evenly distributed along the circumference of the main column. The two groups of dry tank steel strands are respectively arranged vertically at different diameters of the main column, and the two groups of dry tank steel strands are staggered. Both ends of the two groups of dry tank steel strands are respectively connected to anchor seats, so that the variable diameter bending area of the main column forms a two-stage tensioning; at the same time, multiple evenly distributed steel strands are pre-buried in each wall of the ballast tank, so that the two ends of the steel strands are respectively inserted into the buoy and the main column and assembled with the anchor seats, and a sacrificial anode is arranged near the anchor seat inside the buoy.

[0005] Furthermore, a foundation top flange is embedded in the top of the main column for connection to the bottom tower of the wind turbine. The foundation top flange has a preset air gap, and the height of the foundation top flange is greater than the measured extreme wave height.

[0006] Furthermore, the concrete material used for the overall concrete pouring is C50 - C100 concrete or UHPC100 - 150 concrete.

[0007] Furthermore, the interior of the main column is designed as a dry cabin structure. The interior of the dry cabin is kept dry, and strand tensioning maintenance equipment, diesel engines, and power supply equipment are installed inside the main column.

[0008] Furthermore, the anchor seat inside the main column is integrally poured with the dry cabin of the main column. A preset distance is formed between the bottom of the main column and the anchor seat of the strand group in the dry cabin for later tensioning maintenance.

[0009] Furthermore, the interior of the ballast tank is divided into multiple ballast sub - tanks by partitions for adjusting the overall draft and levelness.

[0010] An anti - cracking concrete floating wind turbine platform is fabricated according to the above - mentioned manufacturing method of the anti - cracking concrete floating wind turbine platform.

[0011] An offshore floating wind turbine includes the above - mentioned anti - cracking concrete floating wind turbine platform.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention solves the characteristic of conventional concrete that "it can withstand pressure but not tension", enabling the concrete platform not to crack on the surface under extreme and fatigue load impacts. Thus, it overcomes the problem that in a conventional concrete floating body under the action of bending moment, the concrete cabin wall is prone to cracking, leading to rapid corrosion of steel bars, and even water ingress into the floating body, resulting in the risk of the floating body's stability failure and capsizing. 2. After the concrete is poured, prestressed tension can be applied after it ages, which is convenient for operation. At the same time, the strand tensioning equipment and power equipment are placed in the set dry cabin of the main column, making maintenance convenient. 3. The platform ballast uses seawater download, and sacrificial anodes are used for anti - corrosion in the wet cabin of the floating drum, which can effectively prevent the corrosion of steel strands. 4. The comprehensive material cost is significantly lower than that of the steel used in traditional manufacturing platforms, showing an obvious cost advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the anti - cracking concrete floating wind turbine platform.

[0014] Figure 2 It is a structural sectional view of the anti - cracking concrete floating wind turbine platform.

[0015] Figure 3 It is a structural sectional view of the main column.

[0016] Figure 4 It is a structural sectional view of the ballast tank.

[0017] Figure 5 It is a structural sectional view of a buoy. Specific implementation manner

[0018] The present invention will be further described below in conjunction with specific embodiments.

[0019] Embodiment 1 The method for manufacturing the anti-cracking concrete floating wind turbine platform provided in this embodiment is to respectively bind steel bars 8 on the side walls of the ballast tank 2, the main column 1 and the buoy 3 and connect the steel bars, and then pour concrete 9 integrally. The concrete material used for the overall concrete pouring is C50-C100 concrete or UHPC100-150 concrete, and the wall thickness of the overall structure is ensured to be 50 cm; the cast-in-place concrete floating wind turbine platform includes a main column 1, a ballast tank 2 and a buoy 3. The three ballast tanks 2 are evenly distributed around the main column 1 at intervals of 120° and are connected to the main column 1. Each ballast tank 2 is connected to a buoy 3. The main column 1 is a variable-diameter main column 1, and the diameter of the bottom section of the main column 1 is larger than that of the top section of the main column 1. See Figure 1 as shown.

[0020] See Figures 2 to 5 as shown. Inside the side wall of the main column 1 and evenly distributed along the circumferential direction of the main column 1, two groups of dry cabin steel strand groups a and b are pre-buried. The two groups of dry cabin steel strand groups a and b are respectively vertically arranged at the top section 101 and the bottom section 102 of the main column 1, and the two groups of dry cabin steel strand groups a and b are arranged in a staggered manner without interfering and overlapping with each other. Anchor seats 4 are respectively provided at both ends of the two groups of dry cabin steel strand groups a and b. The inside of the main column 1 is a dry cabin structure. The steel strand tensioning and maintenance equipment, diesel engine and power supply equipment are all placed in the dry cabin of the main column 1. Through the combined action of the steel strand tensioning and maintenance equipment, diesel engine and power supply equipment, the two groups of dry cabin steel strand groups a and b are tensioned, so that a two-stage tensioning is formed in the variable-diameter and bending area of the main column 1; at the same time, the anchor seats 4 inside the main column 1 are integrally poured with the dry cabin of the main column 1, and a distance of 1.5 m is formed between the bottom of the main column 1 and the anchor seats 4 of the dry cabin steel strand group, which is convenient for later tensioning and maintenance; a foundation top flange for connecting with the bottom tower barrel 7 of the wind turbine is pre-buried at the top of the main column 1. The foundation top flange is provided with an air gap, and the height of the foundation top flange is greater than the measured extreme wave height, ensuring that seawater will not enter the inside of the wind turbine tower barrel 7 from the flange joint.

[0021] Three evenly distributed steel strands 5 are pre-buried in each wall surface of the ballast tank 2, so that both ends of the steel strands 5 respectively penetrate into the buoy 3 and the main column 1, and anchor seats 4 are respectively assembled. The inside of the ballast tank 2 is divided into three ballast sub-tanks 202 by two partitions 201. The main function of the ballast sub-tanks 202 is to adjust the ballast water for adjusting the draft of the floating body and the levelness of the floating body.

[0022] A ballast function is also set in the buoy 3. On the one hand, the buoy 3 plays a role in assisting floating. On the other hand, it cooperates with the ballast water in the ballast tank 2 to adjust the floating body. Since the ballast water in the buoy 3 is seawater, a sacrificial anode 6 for preventing seawater corrosion is arranged near the anchor seat inside the buoy 3.

[0023] Embodiment 2 See Figure 1 As shown, the anti-cracking concrete floating wind turbine platform provided in this embodiment is made according to the manufacturing method of the anti-cracking concrete floating wind turbine platform described in Embodiment 1. The anti-cracking concrete floating wind turbine platform includes a main column 1, a ballast tank 2 and a buoy 3. The three ballast tanks 2 are evenly distributed around the main column 1 at an interval of 120° and are connected to the main column 1. Each ballast tank 2 is connected to a buoy 3. The main column 1 is a stepped main column, and the diameter of the bottom section of the main column is larger than the diameter of the top section of the main column.

[0024] The above-mentioned embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A manufacturing method of a crack - resistant concrete floating wind turbine platform. The concrete floating wind turbine platform includes a main column, ballast tanks and pontoons. There are multiple ballast tanks evenly distributed around the main column and connected to the main column. Each ballast tank is connected to a pontoon. The main column is a variable - diameter main column, and it is characterized in that: The method comprises the following steps: tying steel bars on the side walls of the ballast tank, the side walls of the main column and the side walls of the pontoon respectively, and connecting the steel bars, and then pouring concrete to form the steel bars in an integrated manner, and ensuring that the wall thickness of the overall structure is at least 50 cm; wherein, two groups of dry tank steel strands are pre-embedded in the side walls of the main column and evenly distributed along the circumference of the main column, the two groups of dry tank steel strands are respectively arranged vertically at different diameters of the main column, and the two groups of dry tank steel strands are staggered, and both ends of the two groups of dry tank steel strands are respectively connected to anchor seats, so that the variable diameter bending area of the main column forms a two-stage tensioning; at the same time, a plurality of evenly distributed steel strands are pre-embedded in each wall surface of the ballast tank, so that the two ends of the steel strands are respectively inserted into the pontoon and the main column and assembled with the anchor seats, and a sacrificial anode is arranged near the anchor seat inside the pontoon.

2. The manufacturing method of an anti-cracking concrete floating wind turbine platform according to claim 1, characterized in that: A foundation top flange is embedded at the top of the main column for connection to the bottom tower of the wind turbine. An air gap is preset in the foundation top flange, and the height of the foundation top flange is greater than the measured extreme wave height.

3. A method for manufacturing a crack-resistant concrete floating wind turbine platform according to claim 1, characterized in that: The concrete material used for integral concrete pouring is C50-C100 concrete or UHPC100-150 concrete.

4. A manufacturing method of an anti-cracking concrete floating wind turbine platform according to claim 1, characterized in that: The interior of the main column is designed as a dry cabin structure, which keeps the interior dry. Steel strand tensioning maintenance equipment, diesel engines and power supply equipment are installed inside the main column.

5. The manufacturing method of an anti-cracking concrete floating wind turbine platform according to claim 4, characterized in that: The anchor seat inside the main column and the dry compartment of the main column are cast as a whole, and a preset distance is formed between the bottom of the main column and the anchor seat of the dry compartment steel strand group for later tensioning and maintenance.

6. A method for manufacturing a crack-resistant concrete floating wind turbine platform according to claim 1, characterized in that: The interior of the ballast tank is divided into multiple ballast compartments by partitions to adjust the overall draft and levelness.

7. A crack-proof concrete floating wind turbine platform, characterized in that: It is manufactured according to the method for manufacturing the anti-cracking concrete floating wind turbine platform according to any one of claims 1-6.

8. An offshore floating wind turbine, characterized in that, Including the anti-cracking concrete floating wind turbine platform as described in claim 7.

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