Land fan foundation construction method

Abstract

The embodiment of the invention provides a land fan foundation construction method. The land fan foundation construction method comprises the steps that cushion layer concrete is poured; mounting a reinforcing mesh on the cushion concrete; paving a first concrete mixture on the reinforcing mesh; mounting a reinforcement cage on the first concrete mixture; paving a second concrete mixture on the reinforcement cage; a fan tower drum is installed on the second concrete mixture; and paving the mixture on the second concrete mixture and on the fan tower drum side until the surface elevation is reached. Through the cooperation of the press-in reinforcement cage and the conventional reinforcement mesh, the second concrete mixture instead of reinforcing steel bars is adopted in a low-stress area, and the effect of limiting the development of structural cracks is achieved. The concrete adopted by the foundation structure is low-slump high-strength concrete and has certain fluidity, the reinforcement cage can be pressed in and anchored, and the concrete can be compacted through rolling. The automation degree of construction is improved, and the quality can be guaranteed and the speed can be increased; cost is saved, and bearing safety can be guaranteed.

Description

Technical Field

[0001] The invention relates to the field of wind power and provides a method for constructing an onshore wind turbine foundation. Background Art

[0002] As the commercial wind power market emerges, the construction technology of onshore wind turbine foundations has become increasingly complex and difficult to build. The currently widely used extended reinforced concrete foundation is large in size and has a high proportion of steel bars, which makes pumping construction difficult, vibration operations cumbersome, and even causes concrete quality defects. The limited space in the steel cage during vibration makes it difficult to ensure that the concrete is fully compacted, and may cause the steel bar bond strength to fail to meet the requirements, affecting the overall bearing capacity of the foundation.

[0003] In the related technologies, most of them need to mix three kinds of concrete mix proportions, the manual vibration construction has many divisions, and at least two sets of construction equipment need to be configured, which has the problems of high cost and low construction efficiency. Summary of the invention

[0004] An embodiment of the present invention provides a method for constructing an onshore wind turbine foundation, so as to solve the defect of low efficiency in constructing a wind turbine foundation in the related art.

[0005] An embodiment of the present invention provides a method for constructing an onshore wind turbine foundation, comprising: pouring cushion concrete; Installing a steel mesh on the cushion concrete; Spreading a first concrete mixture on the steel mesh; installing a steel cage on the first concrete mixture; spreading a second concrete mixture on the steel cage; installing a fan tower on the second concrete mixture; The mixture is spread on the second concrete mixture and on the side of the wind turbine tower until the ground surface elevation.

[0006] According to one embodiment of the present invention, the first concrete mixture uses a primary aggregate, the slump of the first concrete mixture is 60 mm, and the compressive strength grade of the first concrete mixture after hardening is at least 60 MPa.

[0007] According to one embodiment of the present invention, the thickness of the first concrete mixture spread on the steel mesh is less than or equal to 10 mm.

[0008] According to one embodiment of the present invention, fiber material is added to the second concrete mixture, the slump of the second concrete mixture is 60 mm, and the compressive strength grade of the second concrete mixture after hardening is at least 60 MPa.

[0009] According to one embodiment of the present invention, the paving thickness of the second concrete mixture is at most 300 mm, and the thickness of the second concrete mixture paved on the top of the steel cage is less than or equal to 10 mm.

[0010] According to one embodiment of the present invention, a vibration roller is used to roll the second concrete mixture so that the anchoring section of the steel cage is pressed into the concrete mixture.

[0011] According to one embodiment of the present invention, the sum of the thicknesses of the cushion concrete, the first concrete mixture and the second concrete mixture after compaction by the vibratory roller is greater than or equal to 1 meter.

[0012] According to one embodiment of the present invention, the mixture includes at least sand, gravel and cement, and the weight ratio of sand, gravel and cement is 40:1.

[0013] According to one embodiment of the present invention, the mixture is compacted by a vibrating roller, and the thickness of each layer of the mixture is 400 mm.

[0014] According to an embodiment of the present invention, the steel cage at least includes ribs along the circumferential, axial and radial directions of the wind turbine tower, and an anchor plate is provided on the steel cage.

[0015] According to the method for constructing a wind turbine foundation provided by an embodiment of the present invention, by laying steel mesh and concrete mixture layer by layer on the cushion concrete, and specially setting a steel cage as a key load-bearing structure, the bearing capacity and wind and earthquake resistance of the wind turbine foundation are greatly enhanced. This multi-layer composite structure can effectively disperse and resist external loads, ensuring the stable operation of the wind turbine in a complex and changeable natural environment. Each step of construction is based on the precise completion of the previous step, such as pouring the cushion concrete first, then installing the steel mesh, and then spreading the concrete mixture layer by layer and installing the steel cage until the wind turbine tower is finally installed and the surface elevation is reached. This layer-by-layer construction method is conducive to controlling the thickness, density and uniformity of each layer of material, thereby improving the overall construction accuracy and quality. The wind turbine foundation construction method refines the construction process of the wind turbine foundation into multiple steps that are easy to manage and control, making the construction process clearer and more orderly. This not only helps to reduce confusion and errors in the construction process, but also improves construction efficiency and shortens the construction period. By accurately calculating the amount of material required for each layer and strictly controlling the spreading and compaction of the material during the construction process, the waste of materials can be minimized. At the same time, reasonable material ratio and construction technology can also ensure that the best performance of the materials is fully utilized. This wind turbine foundation construction method is suitable for onshore wind turbine foundation construction in different geological conditions and terrain environments. By adjusting the thickness of the cushion concrete, the specifications of the steel mesh and steel cage, and the ratio of the concrete mixture, various complex situations can be flexibly responded to to ensure the stability and safety of the wind turbine foundation. Since the wind turbine foundation structure is stable and the quality is reliable, it is not easy to be damaged or malfunctioned during use, thereby reducing the later maintenance cost. At the same time, good construction quality and structural performance also help to extend the service life of the wind turbine. By using the combination of pressed steel cage and conventional steel mesh, steel bars are not used in the low stress area, but the second concrete mixture is used to limit the development of structural cracks. The concrete used in the foundation structure is low slump high-strength concrete with a certain fluidity, which can realize the pressed-in anchoring of the steel cage, and the concrete itself can be compacted by rolling. During the foundation construction process, the steel mesh and concrete are added and rolled layer by layer to realize the anchoring of the steel cage and the interlayer overlap of the steel cage, while realizing the compaction of the concrete. In addition, since the pedestal in the relevant technology is eliminated, the tower is directly installed, and the lower part of the tower and the second concrete mixture are rolled and backfilled to form a reliable protective layer and ballast, enhancing the stability of the foundation structure. The step of manually vibrating concrete is eliminated, the degree of automation of construction is improved, which is more conducive to ensuring quality and speeding up the construction; the distribution range of the structural stress steel bars is optimized, the configuration of construction equipment is simplified, and costs are saved; a new backfilling method is adopted to form a reliable protective layer and ballast for the structure, which is conducive to ensuring load-bearing safety. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 It is a schematic flow chart of the onshore wind turbine foundation construction method provided by the present invention.

[0018] Figure 2 It is a schematic cross-sectional view of the onshore wind turbine foundation provided by the present invention.

[0019] Figure 3 It is a schematic structural diagram of the steel cage provided by the present invention.

[0020] Reference numerals: 100, steel cage; 102, anchor plate; 104, high stress area; 106, low stress area. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] like Figures 1 to 3 As shown, an embodiment of the present invention provides a method for constructing an onshore wind turbine foundation, comprising: Step 10, pouring cushion concrete; Step 20, installing a steel mesh on the cushion concrete; Step 30, spreading the first concrete mixture on the steel mesh; Step 40, installing the steel cage 100 on the first concrete mixture; Step 50, spreading a second concrete mixture on the steel cage 100; Step 60, installing a fan tower on the second concrete mixture; Step 70, spreading the mixture on the second concrete mixture and / or on the side of the wind turbine tower until the ground surface elevation.

[0023] According to the wind turbine foundation construction method provided by the embodiment of the present invention, by laying steel mesh and concrete mixture layer by layer on the cushion concrete, and specially setting the steel cage 100 as the key load-bearing structure, the bearing capacity and wind and earthquake resistance of the wind turbine foundation are greatly enhanced. This multi-layer composite structure can effectively disperse and resist external loads, ensuring the stable operation of the wind turbine in a complex and changeable natural environment. Each step of construction is based on the precise completion of the previous step, such as pouring the cushion concrete first, then installing the steel mesh, and then spreading the concrete mixture layer by layer and installing the steel cage 100, until the wind turbine tower is finally installed and the surface elevation is reached. This layer-by-layer construction method is conducive to controlling the thickness, density and uniformity of each layer of material, thereby improving the overall construction accuracy and quality. The wind turbine foundation construction method refines the construction process of the wind turbine foundation into multiple steps that are easy to manage and control, making the construction process clearer and more orderly. This not only helps to reduce confusion and errors in the construction process, but also improves construction efficiency and shortens the construction period. By accurately calculating the amount of material required for each layer and strictly controlling the spreading and compaction of the material during the construction process, the waste of materials can be minimized. At the same time, reasonable material ratio and construction technology can also ensure that the best performance of the material is fully utilized. This wind turbine foundation construction method is suitable for onshore wind turbine foundation construction in different geological conditions and terrain environments. By adjusting the thickness of the cushion concrete, the specifications of the steel mesh and the steel cage 100, and the ratio of the concrete mixture and other parameters, various complex situations can be flexibly responded to to ensure the stability and safety of the wind turbine foundation. Since the wind turbine foundation structure is stable and the quality is reliable, it is not easy to be damaged or malfunction during use, thereby reducing the subsequent maintenance cost. At the same time, good construction quality and structural performance also help to extend the service life of the wind turbine. By adopting the combination of pressed-in steel cage 100 and conventional steel mesh, steel bars are not used in the low stress area 106, but the second concrete mixture is used to limit the development of structural cracks. The concrete used in the foundation structure is low-slump high-strength concrete, which has a certain fluidity, can realize the pressed-in anchoring of the steel cage 100, and the concrete itself can be compacted by rolling. During the foundation construction process, the steel mesh and concrete are added and rolled layer by layer to achieve the anchoring of the steel cage 100 and the overlap between the layers of the steel cage 100, while achieving the compaction of the concrete. In addition, since the pedestal in the related technology is eliminated, the tower is directly installed, and the mixture is rolled and backfilled on the lower part of the tower and the second concrete mixture to form a reliable protective layer and ballast, thereby enhancing the stability of the foundation structure. The step of manually vibrating concrete is eliminated, the degree of automation of construction is improved, and it is more conducive to ensuring quality and speeding up the process; the distribution range of the structural stress-bearing steel bars is optimized, the configuration of construction equipment is simplified, and costs are saved; a new backfilling method is adopted to form a reliable protective layer and ballast for the structure, which is conducive to ensuring load-bearing safety.

[0024] Please continue to see Figures 1 to 3, an embodiment of the present invention proposes a method for constructing an onshore wind turbine foundation, which constructs a stable and solid wind turbine foundation through a series of orderly and interrelated steps.

[0025] Pouring cushion concrete (step 10): First, pour a layer of cushion concrete in the foundation construction area. This layer of concrete provides a solid foundation for subsequent steel mesh and concrete layers, helping to improve the stability and durability of the overall structure.

[0026] Install the steel mesh (step 20): After the cushion concrete is completely cured, install the steel mesh on it. The steel mesh forms a mesh structure through crisscrossing steel bars, which enhances the tensile strength and bearing capacity of the foundation to cope with various mechanical loads during the operation of the wind turbine.

[0027] Spreading the first concrete mixture (step 30): Spread the first layer of concrete mixture on the steel mesh. This layer of concrete is tightly combined with the steel mesh to form a more solid overall structure, further improving the stability and strength of the foundation.

[0028] Install the steel cage 100 (step 40): before the first layer of concrete mixture is initially set, install the steel cage 100. As a core bearing structure, the steel cage 100 can effectively disperse and resist the huge load from the wind turbine tower and its upper structure, ensuring the stability of the entire foundation structure.

[0029] In addition, it should be noted that, in the embodiment of the present invention, the steel cage 100 is disposed in the high stress area 104 .

[0030] Spreading the second concrete mixture (step 50): Spreading the second layer of concrete mixture on the steel cages 100. This layer of concrete not only fills the gaps between the steel cages 100, but also closely combines with the steel cages 100 and the first layer of concrete mixture to form a complete load-bearing system. That is, the second concrete mixture is used in the low stress area 106.

[0031] Install the wind turbine tower (step 60): After the second layer of concrete mixture reaches the design strength, the wind turbine tower is installed thereon. The wind turbine tower is fixed to the foundation by bolts or other means to ensure that the wind turbine does not move or tilt during operation.

[0032] Spreading the mixture to the ground surface elevation (step 70): Finally, the mixture is spread on the second concrete mixture and / or around the wind turbine tower until the ground surface elevation is reached. This step not only improves the stability of the foundation, but also protects the foundation and prevents rain erosion and soil loss.

[0033] The design of a multi-layer composite structure (cushion concrete, steel mesh, two layers of concrete mixture and steel cage 100) significantly improves the bearing capacity and wind and earthquake resistance of the wind turbine foundation, ensuring the stable operation of the wind turbine in a complex environment. The complex construction process is broken down into multiple steps that are easy to manage and control, making the construction process clearer and more orderly, improving construction efficiency and shortening the construction period.

[0034] More importantly, by adopting the combination of the pressed-in steel cage 100 and the conventional steel mesh, the second concrete mixture is used instead of steel bars in the low stress area 106, which plays a role in limiting the development of structural cracks. The concrete used in the foundation structure is low-slump high-strength concrete, which has a certain fluidity, can realize the pressed-in anchoring of the steel cage 100, and the concrete itself can be compacted by rolling. In the process of foundation construction, the steel mesh and concrete are added and rolled layer by layer to realize the anchoring of the steel cage 100 and the interlayer overlap of the steel cage 100, and at the same time realize the compaction of the concrete. In addition, since the pedestal in the related technology is eliminated, the tower is directly installed, and the mixture is rolled and backfilled on the lower part of the tower and the second concrete mixture to form a reliable protective layer and ballast, thereby enhancing the stability of the foundation structure. The step of manually vibrating concrete is eliminated, the degree of automation of construction is improved, and it is more conducive to ensuring quality and speeding up; the distribution range of the structural stress-bearing steel bars is optimized, the configuration of the construction equipment is simplified, and the cost is saved; a new backfilling method is adopted to form a reliable protective layer and ballast for the structure, which is conducive to ensuring bearing safety.

[0035] According to one embodiment of the present invention, the first concrete mixture uses a primary aggregate, the slump of the first concrete mixture is 60 mm, and the compressive strength grade of the first concrete mixture after hardening is at least 60 MPa.

[0036] In one embodiment of the present invention, the first concrete mixture uses primary aggregate as its main aggregate component. The primary aggregate has a reasonable particle size distribution, good shape, solid quality, and is conducive to the diffusion of concrete in a narrow space. These characteristics help to improve the density and mechanical properties of concrete.

[0037] Furthermore, the technical solution sets the slump of the first concrete mixture to be 60 mm. Slump is an important indicator for measuring the workability or fluidity of concrete. Through experiments, it was found that the 60 mm slump concrete has both greater fluidity and certain plasticity during the pouring process, which is convenient for construction operations.

[0038] In addition, the technical solution also requires that the compressive strength grade of the first concrete mixture after hardening should reach at least 60 MPa. Compressive strength is the maximum ability of concrete materials to withstand pressure without being damaged, and is one of the important indicators for measuring the mechanical properties of concrete. The compressive strength grade of 60 MPa means that the concrete mixture has extremely high load-bearing capacity after hardening.

[0039] The slump of 60 mm makes the first concrete mixture have better fluidity and plasticity during the construction process, which is convenient for paving and compaction, reduces the difficulty of construction and improves the construction efficiency. By adopting the first-grade aggregate and ensuring that the compressive strength grade reaches 60 MPa after hardening, the first concrete mixture has higher bearing capacity and durability in structure, can more effectively resist external loads and erosion, and enhance the overall safety of the building. Reasonable aggregate grading and proportion design not only improves the mechanical properties of concrete, but also helps to reduce the amount of cementitious materials such as cement, reduces costs, and achieves a win-win situation of economic and environmental benefits. Because the concrete mixture has the dual advantages of high strength and suitable fluidity, it can be widely used in various engineering fields with high requirements for concrete performance.

[0040] According to one embodiment of the present invention, the thickness of the first concrete mixture spread on the steel mesh is less than or equal to 10 mm.

[0041] In one embodiment of the present invention, the thickness of the concrete layer spread on the steel mesh should be less than or equal to 10 mm. This technical requirement is intended to ensure uniform distribution of the concrete layer on the steel mesh, while ensuring that the lower steel bars are not damaged when rolling the concrete, and that the upper steel bars are embedded in the lower concrete when rolling the upper layer.

[0042] To achieve this goal, the following technical measures may be taken, including but not limited to: Precise metering and mixing: Ensure that the concrete mixture is accurately proportioned and evenly mixed to ensure its fluidity and plasticity, so that it can form a uniform thin layer during paving and is suitable for rolling.

[0043] Advanced paving equipment: High-precision, adjustable paving equipment can accurately control the paving thickness of concrete to ensure that it reaches the predetermined thickness requirement on the steel mesh.

[0044] Real-time monitoring and adjustment: During the construction process, the thickness of the concrete layer is monitored in real time and the parameters of the paving equipment or the construction method are adjusted in time to ensure the uniformity and accuracy of the thickness.

[0045] Strengthen the training of construction personnel: Provide professional training to construction personnel to enhance their awareness of the importance of controlling the thickness of concrete paving, and to master the correct construction methods and techniques.

[0046] By controlling the paving thickness of the concrete mixture on the steel mesh, the close combination of concrete and steel bars can be ensured, the integrity and bearing capacity of the structure can be improved, and the quality and service life of the structure can be improved. Due to the use of precise paving equipment and real-time monitoring technology, the adjustment time and labor costs during the construction process can be greatly reduced, and the construction efficiency can be improved. At the same time, the uniform thickness of the concrete layer also helps the smooth progress of subsequent construction processes. By accurately controlling the paving thickness of concrete, the problem of material waste caused by uneven thickness can be avoided. This not only helps to reduce construction costs, but also helps to achieve resource conservation and environmental protection. The internal stress and temperature changes generated by the thinner concrete layer during the hardening process are relatively small, which helps to reduce safety hazards caused by changes in the volume of concrete, such as structural cracking, deformation and other problems. Therefore, controlling the paving thickness of concrete also helps to improve safety during the construction process.

[0047] According to one embodiment of the present invention, fiber material is added to the second concrete mixture, the slump of the second concrete mixture is 60 mm, and the compressive strength grade of the second concrete mixture after hardening is at least 60 MPa.

[0048] In one embodiment of the present invention, the second concrete mixture is innovative in formulation, and fiber materials are particularly introduced to enhance its performance. The addition of fiber materials is intended to improve the crack resistance, durability and toughness of concrete, while maintaining or improving its original workability and mechanical properties.

[0049] Specifically, in the preparation process of the second concrete mixture, in addition to conventional cementitious materials, aggregates, water and admixtures, an appropriate amount of fiber materials are additionally added. These fiber materials can be steel fibers, polypropylene fibers, glass fibers, etc. They have excellent properties such as high strength, high modulus, wear resistance, corrosion resistance, etc., and can be effectively dispersed in concrete to form a three-dimensional network structure.

[0050] In addition, the technical solution also requires the slump of the second concrete mixture to be 60 mm to ensure that it has good fluidity and plasticity during construction, which is convenient for pouring and vibrating. At the same time, the compressive strength grade of the second concrete mixture after hardening must also reach at least 60 MPa to meet the structural strength requirements of the project.

[0051] To achieve this goal, a series of technical measures can be taken, including but not limited to: Selection and proportion of fiber materials: According to the project requirements and concrete performance requirements, select the appropriate type and dosage of fiber materials, and determine the best proportion through experiments.

[0052] Optimization of mixing process: Use appropriate mixing process and mixing time to ensure that the fiber material is evenly dispersed in the concrete to avoid agglomeration or sedimentation.

[0053] Control of the construction process: During the construction process, strictly control the pouring, vibration and maintenance of concrete to ensure that the quality of the concrete layer meets the design requirements.

[0054] The addition of fiber materials can significantly improve the crack resistance of concrete, reduce crack problems caused by temperature changes, shrinkage and expansion, and improve the integrity and durability of the structure. The three-dimensional network structure formed by fiber materials in concrete can absorb and disperse external impact energy, improve the toughness and impact resistance of concrete, and make the structure more resistant to extreme loads such as earthquakes and explosions. On the basis of maintaining the original workability and fluidity of concrete, the addition of fiber materials can also improve the mechanical properties of concrete such as compressive strength and tensile strength, so that the structure has a higher bearing capacity.

[0055] According to one embodiment of the present invention, the paving thickness of the second concrete mixture is at most 300 mm, and the thickness of the second concrete mixture paved on the top of the steel cage 100 is less than or equal to 10 mm.

[0056] In one embodiment of the present invention, the paving thickness of the second concrete mixture is designed to have a specific hierarchy, aiming to meet the different requirements of different structural parts for concrete performance. Specifically, the overall paving thickness is set to a maximum of 300 mm to ensure that the main part of the structure has sufficient concrete cover thickness and bearing capacity. At the same time, the paving thickness on the top of the steel cage 100 is strictly controlled to be less than or equal to 10 mm to ensure that the lower steel cage 100 is not damaged when rolling concrete, and the upper steel cage 100 can be embedded in the lower concrete when rolling the upper layer.

[0057] To achieve this goal, the following aspects may be included: Layered paving: During the paving process, a layered paving method is used, first laying a thicker concrete layer (up to 300 mm) as the main part of the structure, and then laying a thinner concrete layer (less than or equal to 10 mm) on top of the steel cage 100. This ensures that the main part of the structure has a sufficient concrete protective layer while avoiding an excessively thick concrete layer on top of the steel cage 100.

[0058] Precisely control the paving thickness: Use high-precision paving equipment and monitoring methods to accurately control the paving thickness of each layer to ensure that it meets the design requirements. Especially at the top of the steel cage 100, special attention should be paid to controlling the paving thickness to avoid being too thick or too thin.

[0059] Improve structural load-bearing capacity: By ensuring that the main part of the structure has sufficient concrete cover thickness of 300 mm, the overall load-bearing capacity and durability of the structure can be improved. This helps to ensure that the structure can maintain stable performance and safety during long-term use.

[0060] A thinner concrete layer (less than or equal to 10 mm) is laid on the top of the steel cage 100 to ensure that the lower steel cage 100 is not damaged when rolling concrete, and the upper steel cage 100 can be embedded in the lower concrete when rolling the upper layer, thereby optimizing the force performance of the steel cage 100. This helps to reduce stress concentration and deformation problems caused by the interaction between concrete and the steel cage 100. By adopting the method of layered paving and accurately controlling the paving thickness, the construction efficiency and quality can be improved. This helps to reduce waste and rework during the construction process, and reduce construction costs and time costs. At the same time, it also helps to improve the overall quality and reliability of concrete structures. By optimizing the formula of concrete mixtures and paving processes, the performance characteristics of concrete such as crack resistance, durability and toughness can be improved. This helps to reduce cracks and damage problems caused by environmental factors (such as temperature changes, humidity changes, etc.) during the use of the structure, and extend the service life of the structure.

[0061] According to one embodiment of the present invention, a vibrating roller is used to compact the second concrete mixture so that the anchoring section of the steel cage 100 is pressed into the concrete mixture.

[0062] In one embodiment of the present invention, a vibrating roller is used to compact the second concrete mixture and effectively press the anchoring section of the steel cage 100 into the concrete mixture.

[0063] The specific steps are as follows: Preparation stage: First, the steel cage 100 is placed at the predetermined position according to the design requirements, ensuring that the anchoring section is exposed and ready to be pressed into the concrete. Then, the second concrete mixture (usually including sand, gravel, cement, water and other possible additives, mixed in a certain proportion) is evenly spread around the steel cage 100 and above the anchoring section to form a mixture layer of a certain thickness.

[0064] Rolling process: Subsequently, the vibrating roller is started to roll the second concrete mixture. The vibrating roller acts on the mixture with its powerful vibration energy and appropriate downward pressure, making it gradually dense and wrapping the anchoring section of the steel cage 100. Through repeated rolling, it is ensured that the anchoring section is fully pressed into the lower layer of concrete and forms a good bond with the concrete. That is, the lower part of the steel cage 100 is barbed (pressed into anchoring type) and is wrapped by the current layer of concrete mixture. Then, the current layer of concrete mixture is rolled with a vibrating roller. While the current layer of concrete mixture is being compacted, the barbs at the lower part of the steel cage 100 in it are also pressed into the lower layer of concrete mixture that has been rolled previously.

[0065] Quality inspection: After rolling is completed, the construction quality is inspected. The main inspection contents include the density and uniformity of the concrete mixture and the pressing depth and stability of the anchoring section of the steel cage 100. Ensure that all indicators meet the design requirements.

[0066] Through the rolling action of the vibrating roller, the anchoring section of the steel cage 100 is effectively pressed into the concrete mixture and overlaps with the steel bars in the lower concrete to form a tight combination. This combination method greatly improves the anchoring strength of the steel cage 100 in the concrete and enhances the overall stability and bearing capacity of the structure. The rolling of the vibrating roller not only helps the anchoring of the steel cage 100, but also significantly improves the density and uniformity of the concrete. The dense concrete has higher strength and durability, can better resist external loads and internal stresses, and extend the service life of the structure. The rolling process of the vibrating roller is relatively fast and continuous, which can greatly improve the construction efficiency. At the same time, since the vibrating roller can complete the compaction of concrete and the anchoring of the steel cage 100 at the same time, the construction process and labor costs are reduced. By strictly controlling the rolling parameters of the vibrating roller and the construction quality inspection process, it can be ensured that the thickness, density and uniformity of each layer of concrete mixture meet the design requirements. This strict quality control measure helps to avoid construction defects and safety hazards and improve the overall quality of the project.

[0067] According to one embodiment of the present invention, the sum of the thicknesses of the cushion concrete, the first concrete mixture and the second concrete mixture after compaction by the vibratory roller is greater than or equal to 1 meter.

[0068] In one embodiment of the present invention, the cushion concrete, the first concrete mixture and the second concrete mixture are rolled by a vibrating roller to ensure that the total thickness of the three layers of concrete is greater than or equal to 1 meter.

[0069] First, according to the design requirements, the cushion layer concrete, the first concrete mixture and the second concrete mixture are spread in sequence. When spreading each layer of concrete, ensure that its thickness is uniform, the surface is flat, and it meets the thickness range required by the design.

[0070] After each layer of concrete is paved, the vibrating roller is immediately started for rolling. The vibrating roller acts on the concrete surface with its powerful vibration energy and appropriate downward force, making it gradually dense and reaching the required strength. During the rolling process, attention should be paid to controlling the driving speed of the vibrating roller and the number of rolling passes to ensure the compaction effect of the concrete.

[0071] During the paving and rolling process, the thickness of each layer of concrete should be strictly controlled to ensure that the total thickness of the three layers of concrete is greater than or equal to 1 meter. This is usually achieved through on-site measurement and monitoring to ensure that the thickness of each layer of concrete meets the design requirements and to review the total thickness after rolling is completed.

[0072] After rolling, the quality of the concrete should be fully tested. This mainly includes testing of the density, strength, flatness, thickness and other indicators of the concrete. Through quality testing, it can be ensured that the construction quality of the concrete meets the design requirements and meets the safety and durability requirements of the structure.

[0073] By ensuring that the total thickness of the cushion concrete, the first concrete mixture and the second concrete mixture is greater than or equal to 1 meter, the bearing capacity of the structure can be significantly improved. The thicker concrete layer can better disperse and transfer the load, reduce the stress concentration phenomenon inside the structure, and thus improve the safety and stability of the structure. The thick concrete layer can better resist the erosion of the external environment and the influence of internal stress, and reduce the generation of defects such as cracks and voids. This helps to improve the durability of the structure and extend the service life of the structure. By strictly controlling the thickness and rolling quality of each layer of concrete, it can be ensured that the construction quality of the concrete meets the design requirements. This helps to reduce quality problems and safety hazards during the construction process and improve the overall quality of the project. In some areas with complex geological conditions and insufficient bearing capacity of the foundation, increasing the thickness of the concrete layer is an effective means to improve the stability and safety of the structure. The technical solution of the present invention can be flexibly applied to engineering construction under different geological conditions.

[0074] According to one embodiment of the present invention, the mixture includes at least sand, gravel and cement, and the weight ratio of sand, gravel and cement is 40:1.

[0075] In one embodiment of the present invention, the mixture is composed of at least two main components, namely, sand and gravel and cement, and the weight ratio between the two components is precisely set to 40:1.

[0076] First, prepare enough gravel and cement in a weight ratio of 40:1. Gravel should have good particle shape, size distribution and cleanliness to ensure the strength and durability of the mixture. Cement should be of standard variety that meets the design requirements to ensure its bonding and hardening properties.

[0077] Put the prepared gravel and cement into the mixer and add appropriate amount of water to mix. The mixing time and speed should be controlled during the mixing process to ensure that the mixture is mixed evenly and reaches the required consistency. Of course, it can also be mixed directly on the ground.

[0078] The properties of the mixture can be adjusted according to actual needs. For example, an appropriate amount of admixture can be added to improve the fluidity, setting time or strength of the mixture.

[0079] The mixed material is transported to the construction site and paved, rolled or poured according to the design requirements. During the construction process, attention should be paid to controlling key indicators such as the thickness, uniformity and density of the mixture.

[0080] The weight ratio of gravel to cement of 40:1 ensures sufficient content of aggregate (sand and gravel) in the mixture, which helps to form a high-strength concrete structure. At the same time, the appropriate addition of cement provides sufficient bonding force, so that the aggregates are closely combined and jointly bear the external load. The high content of gravel and the appropriate addition of cement make the mixture have good durability such as impermeability, wear resistance and freeze-thaw resistance. The improvement of these properties helps to extend the service life of the structure and reduce maintenance costs. Compared with traditional high-cement content concrete, the mixture of the present invention reduces costs by reducing the amount of cement and increasing the content of gravel. This is of great significance for large-scale civil engineering projects, which can reduce overall construction costs and improve economic benefits. Reducing the amount of cement helps to reduce carbon emissions and energy consumption in the production process, which meets the requirements of modern buildings for environmental protection and sustainable development.

[0081] According to one embodiment of the present invention, the mixture is compacted by a vibrating roller, and the thickness of each layer of the mixture is at least 400 mm.

[0082] In one embodiment of the present invention, the thickness of each layer of the mixture is at least 400 mm. This setting is intended to improve the density and strength of the mixture through the compaction effect of the vibrating roller, while ensuring the construction quality and efficiency.

[0083] First, prepare the mixture according to the design requirements. The mixture should contain appropriate sand, gravel, cement and other additives that may be needed, and mix them evenly through mixing equipment.

[0084] The mixture is spread in layers in the predetermined construction area. The thickness of each layer of the mixture should be strictly controlled to reach 400 mm. This ensures that the vibrating roller can fully act on the mixture during the rolling process to achieve the ideal compaction effect.

[0085] After each layer of the mixture is paved, the vibrating roller is immediately started for rolling. The vibrating roller acts on the surface of the mixture with its powerful vibration energy and appropriate downward pressure. Through the dual effects of vibration and rolling, the mixture gradually becomes dense and reaches the required strength. During the rolling process, attention should be paid to controlling the driving speed of the vibrating roller and the number of rolling passes to ensure the compaction uniformity and density of the mixture.

[0086] After rolling, the quality of the mixture should be fully tested. This mainly includes the testing of the density, strength, flatness, thickness and other indicators of the mixture. Through quality testing, it can be ensured that the construction quality of the mixture meets the design requirements and meets the safety and durability requirements of the structure.

[0087] Through the rolling action of the vibrating roller, the particles in the mixture are tightly combined together to form a dense mixture of gravel and concrete, which hardens to form a dense and hard structure. This helps to improve the strength and durability of the mixture and enhance the bearing capacity of the structure. The setting of 400 mm thickness of each layer of the mixture ensures that the vibrating roller can fully act on the mixture during the rolling process, avoiding the problems of uneven compaction and insufficient strength caused by too thin thickness. At the same time, strict quality control measures ensure that the construction quality of the mixture meets the design requirements. The rolling process of the vibrating roller is relatively fast and continuous, which can greatly improve the construction efficiency. At the same time, since the thickness of each layer of the mixture is effectively controlled, the number of repeated paving and rolling is reduced, further improving the construction efficiency.

[0088] According to an embodiment of the present invention, the steel cage 100 at least includes ribs along the circumferential, axial and radial directions of the wind turbine tower, and an anchor plate 102 is provided on the steel cage 100 .

[0089] like Figure 3 As shown, in one embodiment of the present invention, the design of the steel cage 100 fully considers the structural characteristics and force requirements of the wind turbine tower, and through careful layout and construction, ensures the stability and bearing capacity of the steel cage 100 in the construction of the wind turbine tower.

[0090] The circumferential ribs are a plurality of main ribs uniformly arranged on the steel cage 100 along the circumference of the wind turbine tower. These main ribs form a stable annular structure, which can effectively resist the circumferential stress and deformation of the tower.

[0091] In addition to the circumferential ribs, the steel cage 100 also includes ribs arranged along the axial direction. These ribs are interwoven with the circumferential ribs to form a network, thereby enhancing the overall rigidity and stability of the steel cage 100 and enabling it to better withstand axial loads.

[0092] In order to further improve the strength and stability of the steel cage 100, radially arranged ribs are also designed. These radial ribs cooperate with the circumferential and axial ribs to form a three-dimensional steel skeleton, so that the steel cage 100 can maintain excellent mechanical properties in all directions.

[0093] An anchor plate 102 is provided at a specific position of the steel cage 100, such as the top. The anchor plate 102 is fixed to the steel cage 100 by welding or other means, and its function is to enhance the bonding force between the steel cage 100 and the concrete, and prevent the steel cage 100 from shifting or floating during the concrete pouring process. At the same time, the anchor plate 102 can also serve as a connection point for subsequent construction (such as installation of other components), thereby improving construction efficiency and quality.

[0094] Through the reasonable arrangement of circumferential, axial and radial ribs, the steel cage 100 forms a stable three-dimensional skeleton structure, which greatly improves its bearing capacity and anti-deformation ability. This enables the steel cage 100 to better adapt to the working requirements of the wind turbine tower under complex stress conditions such as wind load and self-weight load. The setting of the anchor plate 102 effectively enhances the bonding force between the steel cage 100 and the concrete, and prevents the displacement and floating of the steel cage 100 during the concrete pouring process. This helps to ensure the molding quality of the concrete tower and improve the stability of the overall structure. The anchor plate 102 serves as a connection point for subsequent construction, which simplifies the construction process and improves construction efficiency. At the same time, due to the improvement of the stability and bearing capacity of the steel cage 100 structure, quality problems and safety hazards in the construction process are also reduced. The steel cage 100 designed by this technical solution has high adaptability and can be adjusted and optimized according to the design requirements of different wind turbine towers. Whether it is the size, shape or stress characteristics of the tower, the structure and parameters of the steel cage 100 can be adjusted to meet actual needs.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for constructing an onshore wind turbine foundation, characterized in that: include: pouring cushion concrete; Installing a steel mesh on the cushion concrete; Spreading a first concrete mixture on the steel mesh; installing a steel cage on the first concrete mixture; spreading a second concrete mixture on the steel cage; installing a fan tower on the second concrete mixture; The mixture is spread on the second concrete mixture and on the side of the wind turbine tower until the ground surface elevation.

2. The onshore wind turbine foundation construction method according to claim 1, characterized in that: The first concrete mixture uses a first-grade aggregate, the slump of the first concrete mixture is 60 mm, and the compressive strength grade of the first concrete mixture after hardening is at least 60 MPa.

3. The onshore wind turbine foundation construction method according to claim 1, characterized in that: The thickness of the first concrete mixture spread on the steel mesh is less than or equal to 10 mm.

4. The onshore wind turbine foundation construction method according to claim 1, characterized in that: The second concrete mixture is added with fiber material, the slump of the second concrete mixture is 60 mm, and the compressive strength grade of the second concrete mixture after hardening is at least 60 MPa.

5. The onshore wind turbine foundation construction method according to claim 1, characterized in that: The paving thickness of the second concrete mixture is at most 300 mm, and the thickness of the second concrete mixture spread on the top of the steel cage is less than or equal to 10 mm.

6. The onshore wind turbine foundation construction method according to claim 5, characterized in that: The second concrete mixture is rolled by a vibrating roller so that the anchoring section of the steel cage is pressed into the concrete mixture.

7. The onshore wind turbine foundation construction method according to claim 6, characterized in that: The total thickness of the cushion concrete, the first concrete mixture and the second concrete mixture after compaction by the vibrating roller is greater than or equal to 1 meter.

8. The onshore wind turbine foundation construction method according to any one of claims 1 to 7, characterized in that: The mixture at least includes sand, gravel and cement, and the weight ratio of sand, gravel and cement is 40:

1.

9. The onshore wind turbine foundation construction method according to claim 8, characterized in that: The mixture was compacted by a vibrating roller, and each layer of the mixture was 400 mm thick.

10. The onshore wind turbine foundation construction method according to any one of claims 1 to 7, characterized in that: The steel cage at least comprises ribs along the circumferential, axial and radial directions of the wind turbine tower, and an anchor plate is arranged on the steel cage.

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