Composite strength concrete foundation structure for wind turbine generator sets

Abstract

This utility model relates to the field of wind power generation technology, and provides a composite strength concrete foundation structure for wind turbine generator sets, including a foundation pad, a foundation lower part, a foundation top, and anchoring components. The foundation lower part is cast on the foundation pad with concrete of a first strength grade. The foundation top is located above the foundation lower part and is used to support and connect the tower of the wind turbine generator set. The foundation top is cast with concrete of a second strength grade, wherein the second strength grade is higher than the first strength grade. The anchoring components are pre-embedded in the foundation lower part and the foundation top, with the lower part of the anchoring components anchored to the foundation lower part and the upper part of the anchoring components extending through the foundation top. This design not only achieves on-demand material allocation, significantly reducing the total cost of concrete and increasing economic benefits, but also improves the performance efficiency and safety of the foundation structure.

Description

Technical Field

[0001] This utility model relates to the fields of civil engineering and wind power generation technology, and in particular to a composite strength concrete foundation structure for supporting wind turbine generator sets. Background Technology

[0002] As a clean and renewable energy source, wind power technology is rapidly developing towards larger capacity and taller towers. The increasing tower height and unit capacity of wind turbines place increasingly higher demands on the load-bearing capacity and stability of the supporting foundation structure. The tower transmits its enormous vertical load, overturning moment, and torque to the foundation through anchoring components such as anchor bolts. The connection area between the bottom of the tower and the top of the foundation is the area of ​​highest stress concentration.

[0003] Traditional wind turbine foundations are typically constructed using a single grade of concrete. For example, if a traditional foundation is made entirely of C40 concrete, the stress below the tower increases dramatically as the unit capacity increases. During wind turbine operation, cracks can easily form on the outer perimeter of the foundation column. If construction is improper, local concrete sections of the foundation column may even be crushed.

[0004] To meet the extremely high local stress requirements at the bottom of the tower, very high-strength concrete was selected to pour the entire foundation. However, the primary function of the foundation is to resist overturning moments by its own weight and volume, and the actual stress borne by the concrete in its lower and edge areas is far below its strength limit. Applying high-strength concrete to the entire foundation, especially in the lower, large-volume area with lower stress levels, resulted in a huge waste of cement and other materials, significantly increasing project costs and contradicting the principles of economical and green construction. Utility Model Content

[0005] This utility model provides a composite strength concrete foundation structure for wind turbine generator sets to solve the above-mentioned technical defects in the prior art. It not only realizes the on-demand allocation of materials, which can significantly reduce the total cost of concrete and increase economic benefits, but also improves the performance efficiency and safety of the foundation structure.

[0006] This utility model provides a composite strength concrete foundation structure for wind turbine generator sets, comprising: base layer; The lower part of the foundation is made of first-strength grade concrete poured on the foundation pad; The foundation top, located above the lower part of the foundation, is used to support and connect the tower of the wind turbine generator set. The foundation top is made of concrete of the second strength grade, wherein the second strength grade is higher than the first strength grade. An anchoring assembly is pre-embedded in the lower part and the top part of the foundation. The lower part of the anchoring assembly is anchored to the lower part of the foundation, and the upper part of the anchoring assembly passes through the top part of the foundation.

[0007] According to the composite strength concrete foundation structure of the wind turbine generator provided by the present invention, a bonding reinforcement interface is provided between the lower part of the foundation and the top part of the foundation, and the bonding reinforcement interface is used to ensure the structural integrity of the two concrete parts with different strength grades.

[0008] According to the composite strength concrete foundation structure for wind turbine generators provided by the present invention, when the first strength grade concrete constituting the lower part of the foundation has not yet set: The bonding enhancement interface is a continuous bonding layer, which is applied to the upper surface of the concrete under the foundation before it initially sets.

[0009] According to the composite strength concrete foundation structure of the wind turbine generator provided by the present invention, the bonding layer is an epoxy resin slurry or polymer-modified cement slurry cured between the concrete at the bottom of the foundation and the concrete at the top of the foundation.

[0010] According to the composite strength concrete foundation structure for wind turbine generators provided by the present invention, when the concrete of the first strength grade constituting the lower part of the foundation has initially set: The bonding-enhancing interface is a roughened construction joint with an uneven surface to provide mechanical locking force.

[0011] The composite strength concrete foundation structure for wind turbine generators provided by the present invention also includes multiple shear-resistant steel bars. The shear-resistant steel bars are pre-installed at the construction joint and simultaneously anchored within the lower part and the top part of the foundation to resist interfacial shear forces.

[0012] According to the composite strength concrete foundation structure of the wind turbine generator provided by the present invention, the surface of the roughened construction joint is further coated with an adhesive layer formed by epoxy resin slurry or polymer-modified cement slurry.

[0013] According to the composite strength concrete foundation structure for wind turbine generators provided by the present invention, the first strength grade is C30 to C40, and the second strength grade is C50 to C60. The foundation pad is made of C20 grade concrete.

[0014] According to the composite strength concrete foundation structure for wind turbine generators provided by the present invention, the first strength grade is C40 and the second strength grade is C50.

[0015] According to the composite strength concrete foundation structure of the wind turbine generator provided by the present invention, the anchoring component is an anchor bolt made of high-strength alloy steel.

[0016] This utility model provides a composite strength concrete foundation structure for wind turbine generators based on the present invention. The foundation structure is divided into two parts: a lower foundation and a top foundation. The lower foundation constitutes the main volume of the foundation structure and is poured using concrete of a lower first strength grade. The top foundation, which directly bears the high stress of the tower, is poured using concrete of a higher second strength grade. Anchoring components are pre-embedded in both the lower and top foundations. The lower part of the anchoring component is anchored to the lower foundation, and the upper part passes through the top foundation. This design not only achieves on-demand material allocation, significantly reducing the total cost of concrete and increasing economic benefits, but also improves the performance efficiency and safety of the foundation structure.

[0017] Specifically, by using low-cost ordinary strength concrete in the large volume area at the bottom of the foundation and high-strength concrete only in the critical load-bearing area at the top, the material is allocated on demand, which can significantly reduce the total cost of concrete and result in significant economic benefits.

[0018] The high-strength concrete at the top of the foundation perfectly matches and diffuses the high concentrated stress from the bottom of the tower, improving the structure's performance efficiency and safety. Meanwhile, the lower concrete primarily utilizes its own weight to resist overturning moments, achieving a precise match between function and material properties. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional schematic diagram of the composite strength concrete foundation structure of the wind turbine generator provided in this embodiment of the utility model.

[0021] Figure 2 This is a partial cross-sectional schematic diagram of the composite strength concrete foundation structure of the wind turbine generator provided in this embodiment of the utility model.

[0022] Figure label: 10. Foundation pad; 20. Lower part of foundation; 30. Top of foundation; 40. Anchorage assembly; 50. Reinforcing steel anchorage reinforcement strip. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0025] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] Currently, wind turbine towers are increasing in height at an average annual rate of 5%-8%, with onshore wind turbine towers exceeding 180 meters and offshore wind turbine towers approaching 300 meters. For every meter increase in tower height, the overturning moment borne by the foundation increases exponentially. The peak local load on a 150-meter-class wind turbine foundation can reach seven times that of wind turbines from the 1980s. This not only means that the foundation structure must bear a greater vertical load but also withstand higher extreme bending moment impacts.

[0028] Taking a 4MW onshore turbine as an example, as the tower height increases from 120 meters to 160 meters, the maximum compressive stress at the foundation ring edge increases sharply from 8.3 MPa to 14.6 MPa, and the anchor bolt preload requirement increases by 32%. The dynamic load caused by the flexible vibration of the tower increases to 40% of the static load, and the foundation fatigue life estimation needs to take into account tens of millions of alternating stress cycles. This means that in the foundation design, the compressive strength requirements for the concrete in the local area (exposed column area) are higher.

[0029] Because traditional foundation structures use C40 concrete as the entire structure, the stress below the tower increases dramatically as the unit capacity rises. During wind turbine operation, cracks easily form on the outer perimeter of the support columns, and improper construction can even cause localized crushing of the concrete. In this situation, increasing the strength of the foundation concrete can effectively improve the situation, but using higher strength concrete for the entire foundation is not economical. Therefore, this utility model proposes a method where the main body of the foundation structure uses conventional concrete, while higher strength concrete is used in specific areas of the support columns.

[0030] Figure 1 This is a cross-sectional schematic diagram of the composite strength concrete foundation structure of the wind turbine generator provided in this embodiment of the utility model.

[0031] See Figure 1 This utility model provides a composite strength concrete foundation structure for a wind turbine generator set. The composite strength concrete foundation structure for the wind turbine generator set includes a foundation pad 10, a foundation lower part 20, a foundation top 30, and an anchoring component 40.

[0032] The foundation cushion layer 10 is located between the original foundation and the lower part of the foundation 20. Its main functions are to evenly transfer the superstructure load, adjust the differential settlement of the foundation, and protect the foundation soil. C15-C20 plain concrete or crushed stone foundation cushion layer 10 is usually used, depending on the bearing capacity of the foundation.

[0033] The lower part of the foundation 20 bears the vertical pressure and horizontal shear force diffused from the top of the foundation 30. It uses low-strength concrete with a large volume proportion to reduce costs. Its reinforcement ratio is 0.5%-1.0% grade steel, mainly resisting temperature shrinkage cracks and local bearing pressure at the bottom of the foundation. That is, the lower part of the foundation 20 is cast on the foundation pad 10 with first-strength grade concrete.

[0034] The foundation top 30 is located above the foundation bottom 20 and is used to support and connect the tower of the wind turbine generator. The foundation top 30 is made of concrete of the second strength grade, which is higher than the first strength grade.

[0035] Essentially, the top 30 of the foundation is directly connected to the tower, and it needs to withstand concentrated forces (bending moment at the bottom of the tower) and high shear forces, so high-strength concrete is used. The reinforcement ratio is 1.5%-2.5%, with circumferential reinforcement resisting circumferential tensile stress and radial reinforcement transferring the tower load to the anchorage assembly 40.

[0036] Anchoring components 40 are pre-embedded in the lower part 20 and the top part 30 of the foundation. The lower part of the anchoring component 40 is anchored to the lower part 20 of the foundation, and the upper part of the anchoring component 40 passes through the top part 30 of the foundation. That is, the anchoring component 40, as the core force transmission component, is usually a prestressed steel strand. The anchoring components 40 are arranged radially, with the lower end anchored into the lower part 20 of the foundation and the upper end passing through the top part 30 of the foundation and bolted to the tower flange. The exposed length of the anchoring component 40 is greater than or equal to 1.5m to reserve space for grouting.

[0037] It should be noted that the first strength grade is C30 to C40, and the second strength grade is C50 to C60; the foundation pad 10 is made of C20 strength concrete.

[0038] The load of the wind turbine is transferred through the tower to the top 30 of the foundation, then through the anchoring components 40 to the lower 20 of the foundation, and finally diffused to the ground. The top 30 of the foundation (high-strength concrete) directly bears the concentrated load of the tower and requires high compressive and shear strength to prevent localized crushing or shear failure. The lower 20 of the foundation (low-strength concrete) diffuses the load into a surface load through the anchoring components 40. It only needs to meet the bearing capacity and shear resistance requirements of the ground, which is sufficient for low-strength concrete, thus reducing costs.

[0039] It is understood that the composite strength concrete foundation structure for wind turbine generators provided in this embodiment of the invention divides the main body of the foundation structure into two parts: the lower foundation 20 and the top foundation 30. The lower foundation 20 constitutes the main volume of the foundation structure and is poured with concrete of a lower first strength grade; while the top foundation 30, which directly bears the high stress of the tower, is poured with concrete of a higher second strength grade. Anchoring components 40 are pre-embedded in the lower foundation 20 and the top foundation 30, with the lower part of the anchoring components 40 anchored to the lower foundation 20 and the upper part of the anchoring components 40 penetrating the top foundation 30. This arrangement not only achieves on-demand allocation of materials, significantly reducing the total cost of concrete and increasing economic benefits, but also improves the performance efficiency and safety of the foundation structure.

[0040] Specifically, by using low-cost ordinary strength concrete in the large volume area of ​​the foundation's lower 20 and high-strength concrete only in the critical load-bearing areas at the top, the material is allocated on demand, which can significantly reduce the total cost of concrete and result in significant economic benefits.

[0041] The high-strength concrete at the top of the foundation perfectly matches and diffuses the high concentrated stress from the bottom of the tower, improving the structure's performance efficiency and safety. Meanwhile, the lower concrete primarily utilizes its own weight to resist overturning moments, achieving a precise match between function and material properties.

[0042] In some embodiments of this invention, a bonding reinforcement interface is provided between the lower foundation 20 and the top foundation 30. This interface ensures the structural integrity of the two concrete sections with different strength grades. While improving structural integrity, crack resistance, shear capacity, and durability, it also reduces construction and maintenance costs, providing technical assurance for the safety, economy, and long-term operation of wind turbine foundations.

[0043] Because concrete of different strength grades (such as the lower 20mm of a C40 foundation and the top 30mm of a C50 foundation) have different elastic moduli, shrinkage rates, and coefficients of thermal expansion, direct pouring can easily lead to interface debonding due to deformation incompatibility. Bond-enhancing interfaces (such as applying polymer-modified interface agents, setting shear keyways, or roughening the surface) improve interlayer bond strength through physical-mechanical interlocking or chemical bonding, effectively avoiding the "double-layer" effect caused by interface debonding, where the upper and lower layers bear loads independently and cannot work together. This ensures that the bending moment, torque, and vertical load transmitted by the tower are continuously transferred to the lower 20mm of the foundation through the interface, eliminating the risk of localized stress concentration.

[0044] For example, the composite strength concrete foundation structure provided in this embodiment of the invention is used to support an extended foundation for a 150-meter-high, 6MW wind turbine generator. The composite strength concrete foundation structure is designed to be circular, with a diameter of 25 meters and a total thickness of 3.5 meters.

[0045] Pour the foundation pad 10, install the anchoring components 40, and tie the foundation reinforcement.

[0046] Then, a 2.5-meter-thick foundation layer 10 is constructed from the top surface upwards, forming the main body of the foundation, using C40 concrete of the first strength grade. The top 30 of the foundation, the uppermost 1.0-meter-thick section, connects directly to the anchoring flange of the tower, using C50 or C55 concrete of the second strength grade. The anchoring assembly 40 is a set of pre-embedded anchor bolt cages, meaning that the anchoring assembly 40 consists of anchor bolts made of high-strength alloy steel, and the anchoring assembly 40 extends through the entire thickness of the foundation. The bond reinforcement interface is located at elevation +2.5 meters, which is the interface between the C40 and C50 concrete.

[0047] In addition, a reinforcing steel anchorage strip 50 can be added to the bond-reinforced interface. Through a composite connection method combining mechanical anchorage and bonding, the integrity, shear resistance, and tensile strength of the interfaces between concretes of different strength grades can be further improved. The cross-sectional view of the reinforcing steel anchorage strip 50 resembles an inverted trapezoid, and the inclined side of the reinforcing steel anchorage strip 50 is set at a 135° angle with the horizontal plane where the top of the foundation 30 is located.

[0048] The core of the steel reinforcement anchorage 50 is to form a reliable anchorage connection between the steel bars (or steel mesh) implanted at the interface and the concrete on both sides, while cooperating with the original steel reinforcement system of the lower part 20 and the top part 30 of the foundation to bear the force.

[0049] Among them, the reinforcing bars in the reinforcing anchorage reinforcement band 50 should preferably be HRB500 grade threaded steel bars or HRB400 grade ribbed steel bars. The surface of the reinforcing bars must be derusted and degreased (by grinding with a wire brush or chemical cleaning) to ensure good adhesion to the interface agent or concrete.

[0050] The reinforcing strip in the steel reinforcement anchorage reinforcement strip 50 can be strip-shaped or mesh-shaped. When the reinforcing strip is strip-shaped, a single steel bar is arranged along the entire length of the interface or at intervals. When the reinforcing strip is mesh-shaped, multiple steel bars are welded into a grid to cover the entire area of ​​the interface.

[0051] The anchorage length of the reinforcing bars in the lower 20 (low-strength concrete) and upper 30 (high-strength concrete) sections of the foundation must meet the requirements of the specifications.

[0052] The construction method for the composite strength concrete foundation structure provided in this embodiment of the utility model includes the following steps: First, the site is leveled, the foundation pit is excavated, a 100mm thick C20 concrete foundation pad layer is poured, the anchoring components are precisely installed, and the bottom and top slab steel mesh and other structural steel bars of the foundation are tied according to the design drawings.

[0053] Then, begin the concrete pouring operation, using C40 ready-mixed concrete, pouring evenly from the center of the foundation outwards until the elevation reaches +2.5 meters. During the pouring process, use a vibrator to thoroughly compact the concrete to ensure it is dense.

[0054] When processing the interface, choose according to the situation on site: Firstly, under the ideal condition of continuous pouring scheme, i.e., compact construction organization and continuous concrete supply: After the lower C40 concrete is poured and, based on observation and experience, before initial setting (the surface is still plastic and leaves an indentation when pressed), immediately perform interface treatment. Quickly and evenly apply a layer of highly penetrating epoxy resin-based interface agent or polymer-modified cementitious slurry to the entire concrete surface at elevation +2.5 meters using a roller brush to form a continuous bonding layer. This bonding layer can penetrate to the surface of the underlying concrete, providing strong chemical bonding.

[0055] After the interface agent is applied, the pouring of the upper C50 high-strength concrete should begin immediately. During the initial stage of pouring the C50 concrete, special attention should be paid to cross-compacting and thorough vibration at the interface between the two types of concrete. The vibrator should be inserted approximately 5-10 cm into the lower C40 concrete layer, allowing the two different grades of concrete to physically fuse and interlock at the interface, forming a tight transition layer beyond chemical bonding, thus achieving a seamless connection.

[0056] Secondly: In the case of intermittent pouring schemes, i.e., when the lower concrete has already completed initial setting or even hardened due to weather, equipment failure, or interruption of concrete supply: After confirming that the lower C40 concrete has hardened, its upper surface is defined as the construction joint.

[0057] First, the entire +2.5 meter elevation surface is roughened using an electric chisel or high-pressure water jet to remove laitance and loose aggregate, creating a rough, uneven surface approximately 5-10 mm deep. Next, according to the design drawings, holes are drilled in the roughened surface and shear reinforcement bars with a diameter of 16 mm and a spacing of 500 mm are inserted to enhance the shear resistance of the interface.

[0058] Then, use high-pressure air to blow away all debris and dust from the roughened surface. After confirming that the surface is clean and dry, apply a layer of polymer-modified cementitious slurry as a binder.

[0059] Once the adhesive has reached the finger-dry state, begin pouring the upper C50 concrete. After pouring, cover the foundation and perform standard curing procedures such as watering until it reaches the design strength.

[0060] Essentially, the interface treatment steps employ two different refined treatment schemes based on the initial setting state of the underlying concrete: 1) If the lower concrete has not yet set: apply epoxy resin or polymer-modified cement slurry or other high-efficiency adhesives to its surface and immediately pour the upper high-strength concrete. At the same time, fully vibrate at the interface to achieve integrated chemical and physical bonding by utilizing the plasticity of the concrete itself.

[0061] 2) If the lower concrete has already set: then treat its interface according to the construction joint standard, that is, first roughen it to increase the mechanical interlocking force, and if necessary, add shear reinforcement to resist shear force, and finally apply adhesive and pour the upper concrete.

[0062] By employing the construction method of any of the above embodiments, the final foundation structure formed in this utility model has a top that perfectly supports the complex load of the tower with high strength, while the bottom provides the necessary weight and stability in an economical way, thus achieving the best balance between structural performance and economic cost.

[0063] The composite strength concrete foundation structure for wind turbine generators provided in this embodiment offers a clear and standardized interface treatment process for different construction conditions (whether the lower layer of concrete has initially set). This ensures a reliable and durable bond between the two types of concrete, eliminates the risk of structural delamination and cracking, and guarantees the integrity and durability of the foundation.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A composite strength concrete foundation structure for a wind turbine generator unit, characterized by, include: Basic subbase (10); The lower part of the foundation (20) is made of concrete of the first strength grade poured on the foundation pad (10); The foundation top (30) is located above the foundation bottom (20) and is used to support and connect the tower of the wind turbine generator set. The foundation top (30) is made of concrete of the second strength grade, wherein the second strength grade is higher than the first strength grade. An anchoring component (40) is embedded in the lower part (20) and the top part (30) of the foundation. The lower part of the anchoring component (40) is anchored to the lower part (20) of the foundation, and the upper part of the anchoring component (40) is inserted through the top part (30) of the foundation.

2. The composite strength concrete foundation structure of a wind turbine generator system according to claim 1, characterized by, A bonding reinforcement interface is provided between the lower part (20) of the foundation and the top part (30) of the foundation, which is used to ensure the structural integrity of the two concrete parts with different strength grades.

3. The composite strength concrete foundation structure of a wind turbine generator system according to claim 2, characterized by, If the first strength grade of concrete constituting the lower part of the foundation (20) has not yet set: The bonding enhancement interface is a continuous bonding layer, which is applied to the upper surface of the foundation (20) before the concrete has initially set.

4. The composite strength concrete foundation structure of a wind turbine generator system according to claim 3, characterized by, The bonding layer is an epoxy resin slurry or polymer-modified cement slurry that is cured between the concrete at the bottom (20) of the foundation and the concrete at the top (30) of the foundation.

5. The composite strength concrete foundation structure of a wind turbine generator system according to claim 2, characterized by, When the first strength grade of concrete constituting the lower part (20) of the foundation has initially set: The bonding-enhancing interface is a roughened construction joint with an uneven surface to provide mechanical locking force.

6. The composite strength concrete foundation structure of a wind power generator set according to claim 5, characterized by, It also includes multiple shear reinforcement bars; The shear-resistant steel bars are pre-installed at the construction joint and simultaneously anchored within the lower part (20) and the top part (30) of the foundation to resist the interface shear force.

7. The composite strength concrete foundation structure of a wind power generator set according to claim 5, characterized by, The roughened construction joint surface is also coated with an adhesive layer formed by epoxy resin slurry or polymer-modified cement slurry.

8. A composite strength concrete foundation structure for a wind power generator unit according to any one of claims 1 to 7, characterized in that, The first strength grade is C30 to C40, and the second strength grade is C50 to C60; The foundation cushion layer (10) is made of C20 strength concrete.

9. The composite strength concrete foundation structure of a wind power generator set according to claim 8, characterized by, The first strength grade is C40, and the second strength grade is C50.

10. A composite strength concrete foundation structure for a wind power generator unit according to any one of claims 1 to 7, characterized in that, The anchoring assembly (40) is an anchor bolt made of high-strength alloy steel.

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