A prefabricated wind turbine tower foundation

Abstract

The utility model provides a prefabricated wind generating set truss foundation belongs to wind generating set foundation field. Solve the problem of existing prefabricated expansion type foundation installation complex poor integrity. It includes prefabricated concrete foundation outer ring beam, inside concentricity is provided with prefabricated concrete foundation inner ring beam, wind turbine anchoring pile cap, sets up in prefabricated concrete foundation inner ring beam far away from ground one side and is anchored through wind turbine pile cap anchoring system, prefabricated radial truss is provided with a plurality and is uniformly arranged between prefabricated concrete foundation outer ring beam and prefabricated concrete foundation inner ring beam, and each prefabricated radial truss is with prefabricated concrete foundation outer ring beam, prefabricated concrete foundation inner ring beam and wind turbine anchoring pile cap and is engaged, truss anchoring system is used for prefabricated radial truss and prefabricated concrete foundation outer ring beam, prefabricated concrete foundation inner ring beam and wind turbine anchoring pile cap anchoring. It is mainly used for the support of wind generating set.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine generator foundations, and in particular relates to a prefabricated wind turbine generator truss foundation. Background Technology

[0002] Wind energy, as a renewable and clean energy source, has broad application prospects. In recent years, with the development of wind power technology, onshore and offshore wind energy have been widely developed and applied. Wind turbine generators are key equipment for wind energy utilization, and with the stable operation and mature manufacturing technology of wind turbine generators, they have been widely put into use.

[0003] The foundation of a wind turbine is a crucial supporting component. Because wind turbine towers are tall structures, they bear significant vertical and horizontal loads and large bending moments during operation. Therefore, the foundation must meet the requirements for bearing these heavy loads. Currently, the common types of wind turbine foundations include spread foundations, pile foundations, ribbed foundations, and rock anchor foundations. Commonly used wind turbine foundations are mainly cast-in-place on-site, which presents problems such as long construction periods and difficulty in controlling construction quality. Furthermore, especially in northern regions, wind turbine foundation construction typically takes place in winter, leading to difficulties in winter concrete pouring and curing, as well as challenges in controlling strength and pouring quality. In coastal and saline-alkali areas, traditional wind turbine foundation concrete strength grades are around C40, which are prone to premature erosion and failure, failing to meet service life requirements. Current prefabricated wind turbine foundation design and construction methods involve dividing spread foundations or ribbed foundations into standard blocks and assembling them. However, prefabricated extended foundations have a large self-weight and need to be divided into several standard blocks during the design process, which leads to complicated installation procedures, a large amount of hoisting work, and poor overall structural integrity. Summary of the Invention

[0004] In view of this, the present invention aims to propose a prefabricated wind turbine truss foundation to solve the problems of complex installation and poor overall integrity of existing prefabricated extended foundations.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a prefabricated wind turbine generator truss foundation, comprising: A precast concrete foundation outer ring beam, with a precast concrete foundation inner ring beam concentrically set on the inner side; The wind turbine anchoring base is set on the side of the inner ring beam of the precast concrete foundation away from the ground and is anchored through the wind turbine anchoring system. Precast radial trusses are provided in multiple and evenly arranged circumferentially between the outer ring beam and the inner ring beam of the precast concrete foundation. Each precast radial truss is engaged with the outer ring beam, the inner ring beam and the wind turbine anchoring platform of the precast concrete foundation. The truss anchoring system is used for anchoring precast radial trusses to the outer ring beam of the precast concrete foundation, the inner ring beam of the precast concrete foundation, and the wind turbine anchoring platform.

[0006] Furthermore, the foundation also includes several pile foundation caps, which are distributed on the near-ground side of the precast concrete foundation outer ring beam, the precast concrete foundation inner ring beam, and all precast radial trusses. Each pile foundation cap is provided with vertical anchoring steel bars, which are anchored through the precast concrete foundation outer ring beam, through the precast radial trusses at the corresponding positions, and / or through the precast concrete foundation inner ring beam and the wind turbine anchoring cap.

[0007] Furthermore, the inner wall of the outer ring beam of the precast concrete foundation is provided with a number of first grooves and a number of first radial bolt holes are provided through the perimeter wall. On the end face away from the ground, a number of second grooves and a number of first vertical bolt holes are provided through for passing through the anchoring steel bars. The first and second grooves are used to engage the precast radial truss.

[0008] Furthermore, the inner wall of the outer ring of the precast concrete foundation inner ring beam is provided with several third grooves for engaging the precast radial truss, several fourth grooves and several through-holes for passing through the anchoring steel bars are provided on the end face away from the ground, and several second radial bolt holes are provided through the perimeter wall.

[0009] Furthermore, the wind turbine anchoring platform is provided with several third vertical bolt holes evenly arranged around the circumference and penetrating along the axial direction, several protrusions on the near-ground end face, and a fifth groove on the peripheral wall for engaging the precast radial truss. The third vertical bolt holes are used to pass through the anchoring steel bars or the prestressed anchor bars of the wind turbine anchoring system to complete the anchoring with the inner ring beam of the precast concrete foundation. The protrusions engage with the fourth groove.

[0010] Furthermore, the fifth groove is provided with a pre-set bolt hole for anchoring with the prefabricated radial truss.

[0011] Furthermore, the wind turbine anchoring platform has several tower prestressing ducts on the side away from the ground for installing the tower.

[0012] Furthermore, the prefabricated radial truss is a triangularly stable structure, including an upper chord, a lower chord, and web members connecting the two. The web members include several straight web members and several diagonal web members.

[0013] Furthermore, the prefabricated radial truss is provided with several vertical channels for passing through anchoring steel bars, a first reserved prestressing tendon channel, and a second reserved prestressing tendon channel.

[0014] Furthermore, the truss anchoring system includes prestressed tendons embedded in the first reserved prestressed tendon duct and horizontal prestressed tendons embedded in the second reserved prestressed tendon duct. The prestressed tendons are anchored to the wind turbine anchoring pier after passing through the preset bolt holes. The two ends of the horizontal prestressed tendons are anchored to the outer ring beam of the precast concrete foundation and the inner ring beam of the precast concrete foundation after passing through the first radial bolt holes and the second radial bolt holes at corresponding positions.

[0015] Compared with existing technologies, the beneficial effects of this utility model are as follows: This foundation constructs a spatial force-bearing system consisting of a precast concrete inner ring beam, a precast concrete outer ring beam, a precast radial truss beam, and a wind turbine anchoring platform connected by a precision anchoring system. This structure efficiently converts the wind turbine load into axial force in the members and transmits it to the ring beam and pile foundation through the radial truss, exhibiting superior mechanical properties and high material utilization. Compared to traditional gravity-type spread foundations, it can save approximately 30%-40% of concrete usage. This foundation also utilizes prestressed anchors and tension bars to form multiple anchorages, ensuring excellent integrity, seismic resistance, and fatigue resistance under long-term dynamic loads. In terms of construction, this foundation achieves a high degree of prefabrication and modularization. Factory production of all components ensures quality and precision, requiring only rapid assembly and tensioning on-site. This completely revolutionizes the traditional foundation construction mode, and is expected to shorten the construction period by more than 60%, while significantly reducing on-site wet work, material waste, and environmental impact. This foundation design demonstrates strong adaptability, flexibly adapting to different wind turbine capacities and complex geological terrains by adjusting the number and configuration of trusses. At the same time, its diverse material combinations and compatibility with both steel and concrete tower types further broaden its application scenarios. It successfully overcomes the multiple contradictions between structural performance, construction efficiency, economic cost and environmental protection in traditional foundations, providing a safer, faster, more economical and greener comprehensive solution for wind farm construction. Attached Figure Description The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is an exploded view of a prefabricated wind turbine truss foundation according to the present invention. Figure 2 This is a schematic diagram of the structure of the precast concrete foundation outer ring beam described in this utility model; Figure 3 This is a schematic diagram of the structure of the inner ring beam of the precast concrete foundation described in this utility model; Figure 4 This is a schematic diagram of the prefabricated radial truss described in this utility model; Figure 5 This is a schematic diagram of the structure of the wind turbine anchoring support platform described in this utility model; Figure 6 This is a diagram showing the connection state between the inner ring beam of the precast concrete foundation and the wind turbine anchorage platform described in this utility model. Figure 7 This is a diagram showing the connection state between the prefabricated radial truss and the wind turbine anchorage platform described in this utility model. Figure 8 This is a schematic diagram of the structure of a prefabricated wind turbine generator truss foundation without the wind turbine anchoring platform described in this utility model. Figure 9 This is a diagram showing the connection state between the prefabricated radial truss and the pile foundation cap described in this utility model. Figure 10 This is a diagram showing the connection state between the inner ring beam of the precast concrete foundation and the pile cap of the present invention. Figure 11 This is a construction flowchart of a prefabricated wind turbine generator truss foundation according to the present invention.

[0016] 1. Precast concrete foundation outer ring beam; 11. First groove; 12. Second groove; 13. First vertical bolt hole; 14. First radial bolt hole; 2. Precast concrete foundation inner ring beam; 2. Third groove; 21. Fourth groove; 22. Second vertical bolt hole; 23. Second radial bolt hole; 24. Precast radial truss; 3. Upper chord; 31. First reserved prestressing tendon duct; 311. Lower chord; 32. Second reserved prestressing tendon duct; 321. Web member; 33. Straight web member; 331. Vertical duct; 3311. Diagonal web member; 332. Truss anchoring system; 4. Prestressing tendon; 41. Horizontal prestressing tendon; 43. Anchoring reinforcement; 5. Wind turbine anchoring platform; 5. Third vertical bolt hole; 51. Protrusion; 52. Tower prestressing duct; 53. Fifth groove; 54. Pre-set bolt hole; 541. Wind turbine platform anchoring system; 6. Prestressed anchor bar; 61. Pile foundation platform; 7. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0018] It should be noted that the descriptions of "left," "right," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this utility model are defined based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and are not intended to indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0019] In the description of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Referring to the accompanying drawings, this embodiment describes a prefabricated wind turbine truss foundation, comprising: The precast concrete foundation outer ring beam 1 has a precast concrete foundation inner ring beam 2 concentrically arranged on its inner side; both the precast concrete foundation outer ring beam 1 and the precast concrete foundation inner ring beam 2 are ring beam structures with internal steel reinforcement skeletons, which are precast and cast in the factory for easy on-site assembly.

[0021] The wind turbine anchoring base 5 is set on the side of the precast concrete foundation inner ring beam 2 away from the ground and is anchored by the wind turbine anchoring system 6. The wind turbine anchoring base 5 mainly serves as the load-bearing foundation of the wind turbine. The structural strength, height and diameter are set according to the structural mechanics requirements, and are reasonably set according to the installation diameter and weight requirements of different wind ducts.

[0022] Multiple prefabricated radial trusses 3 are evenly arranged circumferentially between the outer ring beam 1 and the inner ring beam 2 of the prefabricated concrete foundation. Each prefabricated radial truss 3 engages with the outer ring beam 1, the inner ring beam 2, and the wind turbine anchoring platform 5. The prefabricated radial truss 3 has a stable right-angled triangular structure. After connecting with the outer ring beam 1, the inner ring beam 2, and the wind turbine anchoring platform 5, it forms a stable integrated structure with strong integrity. The frame-like support form does not result in excessive weight. During installation, the outer ring beam 1, the inner ring beam 2, the radial truss 3, and the wind turbine anchoring platform 5 are assembled through the cooperation of slots and prefabricated anchor bars, reducing the time spent on the construction site. Furthermore, the prefabrication method allows for high precision production in the factory, reduces susceptibility to external factors, and results in better quality and higher structural strength after assembly.

[0023] The truss anchoring system 4 is used for anchoring the precast radial truss 3 to the precast concrete foundation outer ring beam 1, the precast concrete foundation inner ring beam 2, and the wind turbine anchoring platform 5. As a unified connection method, the truss anchoring system 4 completes the anchoring work after splicing, ensuring the stability and reliability of the spliced ​​structure.

[0024] In this embodiment, the foundation also includes several pile caps 7, distributed near the ground on the outer ring beam 1, inner ring beam 2, and all precast radial trusses 3 of the precast concrete foundation. Each pile cap 7 is equipped with a vertical anchoring steel bar 43, which is anchored through the outer ring beam 1, through the corresponding precast radial truss 3, and / or through the inner ring beam 2 and the wind turbine anchoring cap 5. The pile caps 7 provide vertical structural support for each structural component, forming a complete support structure after backfilling. Pre-embedded anchoring steel bars 43 are provided on each pile cap 7. The extension length of the anchoring steel bars 43 is determined according to the structure of the connected components above. For the wind turbine anchoring system 6, the anchoring steel bars 43 can be pre-embedded in the pile cap 7, or they can be separate prestressed anchor bars 61, depending on the construction requirements.

[0025] In this embodiment, combined with Figure 1 and Figure 2 The precast concrete foundation outer ring beam 1 has several first grooves 11 on its inner wall and several first radial bolt holes 14 penetrating its perimeter. On the end face away from the ground, several second grooves 12 and several first vertical bolt holes 13 penetrating for anchoring steel bars 43 are provided. The first grooves 11 and second grooves 12 are used to engage the precast radial truss 3. The precast concrete foundation outer ring beam 1 is circular in shape, with multiple evenly distributed pile caps 7 on its lower end face. Each pile cap 7 has pre-embedded anchoring steel bars 43. During installation of the precast concrete foundation outer ring beam 1, the upward-protruding pre-embedded anchoring steel bars 43 on each pile cap 7 pass through the corresponding first radial bolt holes 14 on the precast concrete foundation outer ring beam 1 and are then anchored, thus completing the fixation of the precast concrete foundation outer ring beam 1. In terms of the entire foundation, the precast concrete foundation outer ring beam 1 is located on the outermost side of the wind turbine foundation.

[0026] In this embodiment, combined with Figure 1 and Figure 3The precast concrete foundation inner ring beam 2 is located on the innermost side of the foundation. Several third grooves 21 for engaging the precast radial truss 3 are provided on the inner wall of the outer ring of the precast concrete foundation inner ring beam 2. Several fourth grooves 22 and several through-holes 23 for passing through the anchoring steel bars 43 are provided on the end face away from the ground. Several second radial bolt holes 24 are provided through-holes on the circumferential wall. Several circumferentially evenly arranged pile foundation caps 7 are provided on the lower end face of the corresponding precast concrete foundation inner ring beam 2. The pre-embedded anchoring steel bars 43 protruding upwards on each pile foundation cap 7 extend upwards after passing through the corresponding second vertical bolt holes 23 until they pass through the wind turbine anchoring cap 5, thus completing the overall fixation of the precast concrete foundation inner ring beam 2 and the wind turbine anchoring cap 5.

[0027] In this embodiment, combined with Figure 1 , Figure 3 , Figure 5 and Figure 6 The wind turbine anchoring platform 5 is provided with several circumferentially evenly arranged third vertical bolt holes 51 that penetrate axially, several protrusions 52 on the near-ground end face, and a fifth groove 54 on the peripheral wall for engaging the precast radial truss 3. The third vertical bolt holes 51 are used to pass through the anchoring steel bars 43 or the prestressed anchor bars 61 of the wind turbine anchoring system 6 to complete the anchoring with the inner ring beam 2 of the precast concrete foundation. The protrusions 52 engage with the fourth groove 22. The prestressed anchor bars 61 can be the aforementioned anchoring steel bars 43 or individual anchor bars, to complete the fixation between the wind turbine anchoring platform 5 and the inner ring beam 2 of the precast concrete foundation. Specifically, the number and location of the third vertical bolt holes 51 correspond to those of the second vertical bolt holes 23. The pre-embedded anchoring steel bars 43 located on the pile cap 7 below the inner ring beam 2 of the precast concrete foundation can be anchored after passing through the inner ring beam 2 and the wind turbine anchor cap 5 in the vertical direction, thus forming an integral connection between the inner ring beam 2 and the wind turbine anchor cap 5. The shape and number of the protrusions 52 correspond to those of the fourth groove 22. During installation, by hoisting the wind turbine anchor cap 5 downwards, each protrusion 52 engages with the corresponding fourth groove 22. This helps with positioning and provides a locking and fixing mechanism, serving as a pre-connection and improving overall integrity.

[0028] In this embodiment, the fifth groove 54 is provided with a preset bolt hole 541 for anchoring with the prefabricated radial truss 3.

[0029] In this embodiment, the wind turbine anchoring platform 5 is provided with a number of tower prestressing ducts 53 on the side away from the ground for installing the tower.

[0030] In this embodiment, the prefabricated radial truss 3 is a triangularly stable structure, including an upper chord 31, a lower chord 32, and web members 33 connecting the two. The web members 33 include several straight web members 331 and several diagonal web members 332. The diagonal web members 332 mainly connect the corner points of adjacent straight web members 331, thereby forming multiple triangularly stable structures and improving the overall structural strength and stability.

[0031] In this embodiment, the prefabricated radial truss 3 is provided with several vertical channels 3311 for passing through the anchoring steel bars 43, a first reserved prestressing tendon channel 311, and a second reserved prestressing tendon channel 321. The vertical channels 311 are reserved inside the straight web members 331, and a pile foundation 7 is arranged at the bottom of the location of the straight web members 331. The anchoring steel bars 43 of the pile foundation 7 pass upward through the vertical channels 311 and are then tensioned to complete the anchoring, thereby bearing the vertical load.

[0032] In this embodiment, the truss anchoring system 4 includes prestressed tendons 41 embedded in the first reserved prestressed tendon duct 311 and horizontal prestressed tendons 42 embedded in the second reserved prestressed tendon duct 321. The prestressed tendons 41 pass through the pre-set bolt holes 541 to anchor to the wind turbine anchoring platform 5. The two ends of the horizontal prestressed tendons 42 pass through the corresponding first radial bolt holes 14 and second radial bolt holes 24 to anchor to the precast concrete foundation outer ring beam 1 and the precast concrete foundation inner ring beam 2. After the above connection process is completed, a spatial force-bearing system is constructed, consisting of the precast concrete foundation inner and outer ring beams, precast radial truss beams, and the wind turbine anchoring platform connected by a precision anchoring system. This structure efficiently converts the wind turbine load into axial force in the members and transmits it to the ring beams and pile foundation through the radial truss, exhibiting superior mechanical properties and high material utilization. Furthermore, multiple anchoring methods, including prestressed anchor bolts and tension bars, ensure the structure's excellent integrity, seismic resistance, and fatigue resistance under long-term dynamic loads. At the construction level, this solution achieves a high degree of prefabrication and modularization. All components are manufactured in factories to ensure quality and precision. On-site, only rapid assembly and tensioning are required, thus completely revolutionizing the traditional foundation construction mode. It is expected to shorten the construction period by more than 60% and significantly reduce on-site wet work, material waste, and environmental impact.

[0033] Furthermore, due to its modular design and the fact that each part can be adjusted according to the actual terrain, this design exhibits strong adaptability. It can flexibly cope with different wind turbine capacities and complex geological terrain by adjusting the number and configuration of trusses. At the same time, the diversity of its material combinations and its compatibility with both steel and concrete tower types further broaden its application scenarios.

[0034] The construction process mainly involves the following steps: Site preparation and foundation positioning: Based on the design data, the site is leveled and the foundation is treated. Precise measurements are taken and lines are laid out to locate the installation positions of the precast concrete foundation outer ring beam 1 and the precast concrete foundation inner ring beam 2. The pile foundation is constructed at the predetermined positions, and the pile foundation cap 7 is poured on the pile top, with anchor steel bars 43 pre-embedded for connection.

[0035] Installation of the ring beam and wind turbine anchoring platform: Hoist the precast concrete foundation outer ring beam 1 and precast concrete foundation inner ring beam 2 to the design position, and perform precise leveling and fixing. Ensure that each first groove 11 and third groove 21 are aligned. Tension the anchoring steel bars 43 corresponding to the pile foundation platform 7 to fix the precast concrete foundation outer ring beam 1 and precast concrete foundation inner ring beam 2. Hoist the wind turbine anchoring platform 5, and precisely embed the protrusion 52 at its bottom into the pre-set fourth groove 22 at the top of the precast concrete foundation inner ring beam 2. Through the wind turbine anchoring system 6, namely the high-strength prestressed anchor bar 61, initially connect the wind turbine anchoring platform 5 to the precast concrete foundation inner ring beam 2.

[0036] Installation and initial fixing of the radial trusses: Each prefabricated radial truss 3 is hoisted sequentially according to the designed quantity. The lower chord 32 of the prefabricated radial truss 3 is inserted into the corresponding first groove 11 and third groove 21 at its ends. The upper chord 31 of the prefabricated radial truss 3 is inserted into the corresponding second groove 12 and fifth groove 54 at its ends. The vertical ducts 3311 at the bottom of the straight web members 331 of the prefabricated radial truss 3 are aligned and passed through the pre-embedded anchoring steel bars 43 on the corresponding pile cap 7. During this stage, an adjustable temporary support system can be used to precisely adjust and temporarily fix the spatial position (elevation, inclination angle, radial position) of each prefabricated radial truss 3.

[0037] Tensioning and anchoring to form a whole: The tensioning truss anchoring system first tensions the lower chord 32: prestressed tendons (or prestressed threaded steel bars) are inserted into the second reserved prestressed tendon duct 321 in the middle of the lower chord 32 for tensioning and anchoring, so that the lower chord 32 is tightly connected to the outer ring beam 1 and the inner ring beam 2 of the precast concrete foundation; then the upper chord 31 is tensioned: prestressed tendons are inserted into the upper chord 31 for tensioning and anchoring, so that the upper chord 31 is tightly connected to the outer ring beam 1 of the precast concrete foundation and the wind turbine anchoring platform 5. The wind turbine anchoring system 6 performs final tensioning on the high-strength prestressed anchor bolts connecting the wind turbine anchoring platform and the inner ring beam, ensuring that the platform and the foundation are tightly connected and avoiding misalignment and separation during operation. The vertical pile foundation connection is anchored by tensioning or tightening the anchoring steel bars passing through the straight web members, such as by tightening nuts or grouting anchoring, to firmly connect the prefabricated radial truss 3 to the lower pile foundation 7, forming a complete vertical force transmission path.

[0038] Temporary support removal and foundation backfilling: After confirming that all anchoring systems have been tensioned and reached design stress, remove the temporary support systems. Perform earthwork backfilling and restore the site.

[0039] Wind turbine tower installation: Depending on the tower type (steel tower or concrete tower), the wind turbine generator tower is installed using the pre-set bolt holes or prestressed ducts on the inner side of the wind turbine anchoring platform.

[0040] The anchoring, tensioning, and foundation backfilling methods mentioned above are existing technologies and will not be elaborated upon.

[0041] The embodiments of the present invention disclosed above are merely illustrative of the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A prefabricated wind turbine generator truss foundation, characterized in that, include: A precast concrete foundation outer ring beam (1) and a precast concrete foundation inner ring beam (2) concentrically arranged on the inner side; The wind turbine anchoring platform (5) is set on the side of the precast concrete foundation inner ring beam (2) away from the ground and anchored through the wind turbine anchoring system (6); Precast radial trusses (3) are provided in multiple and evenly arranged circumferentially between the outer ring beam (1) and the inner ring beam (2) of the precast concrete foundation. Each of the precast radial trusses (3) is engaged with the outer ring beam (1), the inner ring beam (2) and the wind turbine anchoring platform (5) of the precast concrete foundation. The truss anchoring system (4) is used for anchoring the precast radial truss (3) to the precast concrete foundation outer ring beam (1), the precast concrete foundation inner ring beam (2), and the wind turbine anchoring platform (5).

2. The prefabricated wind turbine generator truss foundation according to claim 1, characterized in that: The foundation also includes pile caps (7), which are provided in several places and distributed on the near-ground side of the precast concrete foundation outer ring beam (1), the precast concrete foundation inner ring beam (2) and all the precast radial trusses (3). Each pile cap (7) is provided with vertical anchoring steel bars (43), which are anchored through the precast concrete foundation outer ring beam (1), through the precast radial trusses (3) at the corresponding position and / or through the precast concrete foundation inner ring beam (2) and the wind turbine anchoring cap (5).

3. The prefabricated wind turbine generator truss foundation according to claim 2, characterized in that: The inner wall of the precast concrete foundation outer ring beam (1) is provided with a number of first grooves (11) and a number of first radial bolt holes (14) are provided through the perimeter wall. On the end face away from the ground, there are a number of second grooves (12) and a number of first vertical bolt holes (13) for passing through the anchoring steel bars (43). The first grooves (11) and the second grooves (12) are used to engage the precast radial truss (3).

4. A prefabricated wind turbine generator truss foundation according to claim 3, characterized in that: The inner wall of the outer ring beam (2) of the precast concrete foundation is provided with several third grooves (21) for engaging the precast radial truss (3), several fourth grooves (22) and several second vertical bolt holes (23) for passing through the anchoring steel bars (43) are provided on the end face away from the ground, and several second radial bolt holes (24) are provided through the perimeter wall.

5. A prefabricated wind turbine generator truss foundation according to claim 4, characterized in that: The wind turbine anchoring platform (5) is provided with several third vertical bolt holes (51) evenly arranged around the circumference and penetrating along the axial direction, several protrusions (52) set on the end face near the ground, and a fifth groove (54) set on the peripheral wall for engaging the precast radial truss (3). The third vertical bolt holes (51) are used to pass through the anchoring steel bars (43) or the prestressed anchor bars (61) of the wind turbine anchoring system (6) to complete the anchoring with the inner ring beam (2) of the precast concrete foundation. The protrusions (52) engage with the fourth groove (22).

6. A prefabricated wind turbine generator truss foundation according to claim 5, characterized in that: The fifth groove (54) is provided with a preset bolt hole (541) for anchoring with the prefabricated radial truss (3).

7. A prefabricated wind turbine generator truss foundation according to claim 5, characterized in that: The wind turbine anchoring bearing (5) has several tower prestressing ducts (53) on the side away from the ground for installing the tower.

8. A prefabricated wind turbine truss foundation according to any one of claims 1-7, characterized in that: The prefabricated radial truss (3) is a triangular stable structure, including an upper chord (31), a lower chord (32) and a web member (33) connecting the two. The web member (33) includes several straight web members (331) and several oblique web members (332).

9. A prefabricated wind turbine generator truss foundation according to claim 6, characterized in that: The prefabricated radial truss (3) is provided with several vertical channels (3311) for passing through anchoring steel bars (43), a first reserved prestressed tendon channel (311) and a second reserved prestressed tendon channel (321).

10. A prefabricated wind turbine generator truss foundation according to claim 9, characterized in that: The truss anchorage system (4) includes prestressed tendons (41) embedded in the first reserved prestressed tendon duct (311) and horizontal prestressed tendons (42) embedded in the second reserved prestressed tendon duct (321). The prestressed tendons (41) pass through the preset bolt holes (541) to complete the anchorage with the wind turbine anchorage platform (5). The two ends of the horizontal prestressed tendons (42) pass through the first radial bolt holes (14) and the second radial bolt holes (24) at the corresponding positions to complete the anchorage with the outer ring beam (1) of the precast concrete foundation and the inner ring beam (2) of the precast concrete foundation.

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