Prefabricated Hybrid Structure Wind Turbine Support Foundation and Construction Method Based on Dry Connection

Abstract

A prefabricated hybrid structure wind turbine support foundation based on dry connection includes a column, a precast base plate and multiple concrete supports surrounding the column. A top ring beam is provided at the upper end of the column, and a bottom ring beam is provided at the lower end. The side of the precast base plate facing the bottom ring beam is connected to the outer side of the bottom ring beam. The concrete supports are placed on the precast base plate, and each concrete support is connected to the top ring beam via a PEC support. Each PEC support is inclined, with one end connected to the top ring beam higher than the other. All components of this invention adopt a combined structure, fully utilizing the stress characteristics of steel and concrete. It has advantages such as high load-bearing capacity, high rigidity, and light weight. Compared with traditional concrete foundations, it reduces the amount of rebar binding work, significantly improves construction efficiency, and adopts a fully prefabricated method. All components are standardized and manufactured in the factory, and dry bolt connections are used on site, making construction simple, connections reliable, and applicable to a wide range of engineering scenarios.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, and specifically relates to a prefabricated hybrid structure wind turbine support foundation based on dry connection and its construction method. Background Technology

[0002] The foundation structure is an important component of wind power structure. It has the unique characteristic of being able to withstand repeated loads in 360° direction, and its stability is crucial to ensuring the normal operation of wind turbine generators.

[0003] Currently, the foundation structure usually adopts cast-in-place reinforced concrete foundation. The spacing of the steel bars is small, the volume of concrete is large, it is not easy to pour, the construction is difficult, the construction period is long, it is difficult to guarantee the foundation quality, there is a lot of wet work on site, and a large amount of construction waste and dust pollution are generated, which is difficult to meet the development requirements of large-megawatt wind turbine units and building industrialization. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a prefabricated hybrid structure wind turbine support foundation based on dry connection and construction method, so as to solve the problems of low bearing capacity, complex structure and large amount of wet work on site of cast-in-place reinforced concrete foundation in the prior art, and significantly improve construction efficiency and shorten construction cycle.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A prefabricated hybrid structure wind turbine support foundation based on dry connection includes a column, a precast base plate and multiple concrete supports arranged around the column, a top ring beam at the upper end of the column and a bottom ring beam at the lower end, the side of the precast base plate facing the bottom ring beam is connected to the outer side of the bottom ring beam, the concrete supports are arranged on the precast base plate, and each concrete support is connected to the top ring beam through a PEC support. Each PEC support is inclined, and the end connected to the top ring beam is higher than the other end.

[0007] In one embodiment, the PEC support is connected to the top ring beam and the concrete support via a node plate connection node. The node plate connection node includes a node plate or a pre-embedded node plate, which is connected to the outer wall of the top ring beam and the side of the concrete support near the column, and is connected to the connecting plate at the end of the PEC support via connecting angle steel and high-strength bolts.

[0008] In one embodiment, the column is a hollow sandwiched steel tube concrete column, comprising an outer steel tube, an inner steel tube, and sandwiched concrete; the top ring beam and the bottom ring beam comprise an outer steel plate and an inner concrete.

[0009] In one embodiment, stud connectors are welded to the inner side of the outer steel pipe, the outer side of the inner steel pipe, and the inner side of the outer steel plate, and the stud connectors are arranged in a square or quincunx pattern.

[0010] In one embodiment, the cross-section of the column is circular, square, hexagonal, or octagonal; the cross-sections of the top and bottom ring beams are the same, being square, hexagonal, or octagonal; the number of PEC supports is consistent with the number of sides of the cross-sections of the top and bottom ring beams, and they are evenly arranged along the circumferential direction of the column.

[0011] In one embodiment, the precast base plate is composed of multiple horizontal plates with isosceles trapezoidal cross-sections, the number of horizontal plates being the same as the number of PEC supports. Each horizontal plate is arranged around the bottom ring beam, and its upper bottom side is connected to the outer side of the bottom ring beam. Each concrete support is respectively arranged on the top surface of a horizontal plate. The horizontal plate includes a precast concrete slab and hollow steel pipes arranged within the precast concrete slab. The hollow steel pipes are arranged at equal angles along the circumferential direction of the pedestal column.

[0012] In one embodiment, the outer side of the bottom ring beam is provided with a connecting channel steel along the side length, the top bottom side of the horizontal plate is provided with an extended channel steel one corresponding to the connecting channel steel, and the two waist sides are provided with extended channel steel two. The lengths of the connecting channel steel and the extended channel steel one are the same as the length of the top bottom of the horizontal plate, and the length of the extended channel steel two is the same as the length of the two waist sides of the horizontal plate.

[0013] In one embodiment, stiffening ribs are welded to one side flange of the connecting channel steel, the first extended channel steel, and the second extended channel steel. The stiffening ribs are arranged at equal intervals along the length of the channel steel, and the flanges are provided with reserved holes for corresponding high-strength bolts. The reserved holes and the stiffening ribs are arranged alternately. Adjacent horizontal plates are connected into a whole by the second extended channel steel and the second high-strength bolts. Each horizontal plate is connected to the column by the connecting channel steel, the first extended channel steel, and the high-strength bolts.

[0014] In one embodiment, the PEC support includes a honeycomb steel section with connecting end plates welded to both ends, precast concrete filling the space between the upper and lower flanges, and a cross-shaped connecting plate welded to the outside of the connecting end plates for connection with the top ring beam and concrete support.

[0015] The present invention also provides a construction method for the prefabricated hybrid structure wind turbine support foundation based on dry connection, comprising:

[0016] 1) In the factory, the fabrication of the pedestal column, top ring beam, bottom ring beam, precast base slab, concrete support and PEC support is completed; the top ring beam and bottom ring beam are installed at the upper and lower ends of the pedestal column; the concrete support is installed on the top surface of the precast base slab.

[0017] 2) On-site, complete the connection between the precast base slab and the bottom ring beam;

[0018] 3) On-site, complete the connection between the top ring beam and the concrete support.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1) Convenient construction

[0021] The prefabricated hybrid structure wind turbine support foundation features simple components. Adjacent precast base slabs and the base slabs are connected to the columns via connecting channel steel and high-strength bolts. PEC supports are connected to the columns and the precast base slabs via node plates, ensuring convenient installation and reliable connections. The columns are hollow-core steel-concrete composite columns, with the inner and outer steel pipes serving as formwork for the poured concrete. The outer steel plate in the ring beam, the protruding channel steel in the precast base slab, and the honeycomb steel in the PEC supports also function as partial formwork, simplifying construction procedures and shortening the construction cycle. All components are standardized and manufactured in the factory, with dry connections on site, significantly improving construction performance.

[0022] 2) Performance improvement

[0023] The prefabricated hybrid structure wind turbine support foundation employs a composite structure for its columns, ring beams, precast base slab, and PEC supports. The columns are hollow-core steel-concrete composite structures, the top and bottom ring beams are steel-concrete composite structures, the precast base slab is a hollow steel-concrete composite slab, and the PEC supports are partially externally encased in steel-concrete composite. This design offers advantages such as high strength, high rigidity, and good stability. The inner and outer steel pipes of the columns and the outer steel plates of the ring beams are all equipped with studs to improve the stability of the steel pipes and plates and enhance the synergistic effect between steel and concrete. Stiffening ribs are installed at all connection nodes to improve node rigidity and seismic performance.

[0024] 3) Low cost

[0025] The prefabricated hybrid structure wind turbine support foundation fully utilizes the material properties of steel and concrete, resulting in high load-bearing capacity, small cross-sectional dimensions, and reduced concrete usage. The PEC support uses honeycomb steel to reduce steel consumption, and the hollow steel pipes inside the prefabricated base plate effectively reduce weight and facilitate transportation and hoisting. On-site prefabrication construction reduces project costs and offers good economic benefits.

[0026] In summary, the prefabricated hybrid structure wind turbine support foundation based on dry connection includes hollow steel tube concrete abutments, steel plate concrete ring beams, hollow steel tube concrete slabs, and PEC supports. It fully leverages the performance advantages of the composite structure, possessing high load-bearing capacity, high stiffness, and light weight. Compared to traditional concrete foundations, it significantly reduces the amount of rebar binding work and substantially improves construction efficiency. This invention adopts a fully prefabricated approach, with all components manufactured to standardized factory specifications. On-site, dry bolt connections are used, simplifying construction, ensuring reliable connections, and demonstrating broad engineering application prospects. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the prefabricated hybrid structure wind turbine support foundation based on dry connection according to the present invention.

[0028] Figure 2 This is an elevation view of the prefabricated hybrid structure wind turbine support foundation based on dry connection according to the present invention.

[0029] Figure 3 This is a top view of the prefabricated hybrid structure wind turbine support foundation based on dry connection according to the present invention.

[0030] Figure 4 This is a cross-sectional schematic diagram of the column in this invention.

[0031] Figure 5 This is a cross-sectional schematic diagram of the top ring beam and the bottom ring beam in this invention.

[0032] Figure 6 This is a schematic diagram of the horizontal plate structure of the prefabricated base plate in this invention.

[0033] Figure 7 This is a schematic diagram of the hollow steel pipe structure of the precast base plate in this invention.

[0034] Figure 8 This is a schematic diagram of the PEC support structure in this invention.

[0035] Figure 9 This is a schematic diagram of the honeycomb steel structure supported by PEC in this invention.

[0036] Figure 10 This is a schematic diagram of the connection between the prefabricated base plates in this invention.

[0037] Figure 11 This is a schematic diagram of the connection between the precast base plate and the column in this invention.

[0038] Figure 12 This is a schematic diagram showing the connection between the PEC support and the column, and between the PEC support and the precast base plate in this invention.

[0039] Icons: 1-Column; 2-Top ring beam; 3-Bottom ring beam; 4-Precast base plate; 5-Concrete support; 6-PEC support; 7-Node plate connection node; 8-Connecting angle steel; 9-High-strength bolt one; 10-Node plate; 11-Embedded node plate; 12-Hollow sandwich steel tube concrete column; 13-Outer steel pipe; 14-Inner steel pipe; 15-Stoke connector; 16-Internal concrete; 17-Outer steel plate; 18-Inner concrete; 19-Connecting channel steel; 20-Extended channel steel one; 21-Extended channel steel two; 22-Stiffening rib plate; 23-Reserved hole; 24-High-strength bolt two; 25-Precast concrete slab; 26-Hollow steel pipe; 27-Honeycomb steel; 28-Precast concrete; 29-Connecting end plate; 30-Cross-shaped connecting plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] like Figure 1 , Figure 2 and Figure 3As shown, this invention discloses a prefabricated hybrid structure wind turbine support foundation based on dry connection, comprising a column 1, a precast base slab 4, concrete supports 5, and PEC supports 6 (partially-encased composite bracings of steel and concrete, abbreviated as PEC supports). The precast base slab 4 surrounds the column 1, and multiple concrete supports 5 are mounted on the precast base slab 4, also surrounding the column 1. A top ring beam 2 is provided at the upper end of the column 1, and a bottom ring beam 3 is provided at the lower end. The outer surface of the bottom ring beam 3 is connected to the side of the precast base slab 4 facing the bottom ring beam 3. The top ring beam 2 is connected to each of the concrete supports 5 via a PEC support 6. Each PEC support 6 is inclined, and the end connecting to the top ring beam 2 is higher than the other end; that is, the height of the top ring beam 2 is greater than the height of the concrete supports 5.

[0045] In this structure, the various components are combined to form a supporting foundation, which ensures convenient installation and reliable connection while guaranteeing their mechanical performance.

[0046] In some embodiments of the present invention, reference is made to Figure 4 The column 1 is a hollow sandwiched steel-concrete column 12, comprising an outer steel pipe 13, an inner steel pipe 14, and a sandwiched concrete layer 16. The outer steel pipe 13 and the inner steel pipe 14 form a hollow sandwiched steel pipe structure, and the sandwiched concrete layer 16 fills the space between the outer steel pipe 13 and the inner steel pipe 14, thus forming the hollow sandwiched steel-concrete column 12. The cross-section of the hollow sandwiched steel-concrete column 12 of this invention can be circular, square, hexagonal, or octagonal. Figure 4 The diagram shows a circle. For example, stud connectors 15 can be welded to the inner side of the outer steel pipe 13 and the outer side of the inner steel pipe 14. The stud connectors 15 can be arranged in a square or quincunx pattern, for example.

[0047] In some embodiments of the present invention, the top ring beam 2 and the bottom ring beam 3 have the same cross-section, which is a regular square, a regular hexagon, or a regular octagon, as shown in the reference. Figure 5 Its cross-section adopts a regular octagon. The top ring beam 2 and the bottom ring beam 3 mainly consist of an outer steel plate 17 and an inner concrete 18. For example, the inner side of the outer steel plate 17 may also be welded with stud connectors 15. The stud connectors 15 can be arranged in a square or quincunx pattern, which can improve the stability of the steel pipe and steel plate and enhance the synergistic working ability of steel and concrete.

[0048] In this embodiment, the number of PEC supports 6 is consistent with the number of sides of the cross-section of the top ring beam 2 and the bottom ring beam 3, and they are evenly arranged along the circumferential direction of the column 1. This arrangement provides good symmetry, which not only facilitates processing but also ensures uniform stress distribution.

[0049] In some embodiments of the present invention, the interlayer concrete 16 and the inner concrete 18 can be ordinary concrete, recycled concrete, high-strength concrete, self-compacting concrete, high-ductility concrete (ECC) or ultra-high performance concrete (UHPC), depending on factors such as mechanical performance requirements and cost.

[0050] In some embodiments of the present invention, in order to achieve connection with the PEC support 6, a node plate 10 is welded to the outside of the outer steel plate 17 of the top ring beam 2.

[0051] In some embodiments of the present invention, reference is made to Figure 6 The precast base slab 4 is composed of multiple horizontal slabs with isosceles trapezoidal cross-sections. In more embodiments, the lower base of the horizontal slab can also be deformed into an arc shape or other shapes. The number of horizontal slabs is the same as the number of PEC supports 6. Each horizontal slab is arranged around the bottom ring beam 3, and its upper base is connected to the outer side of the bottom ring beam 3. Each concrete support 5 is respectively arranged on the top surface of a horizontal slab. The horizontal slab of the present invention includes a precast concrete slab 25 and a hollow steel pipe 26 disposed within the precast concrete slab 25. (Refer to...) Figure 7 The hollow steel pipes 26 are arranged at equal angles along the circumferential direction of the column 1. The concrete support 5 and the precast concrete slab 25 are poured simultaneously. The concrete can be high-strength concrete, self-compacting concrete, high-ductility concrete (ECC), or ultra-high performance concrete (UHPC).

[0052] In some embodiments of the present invention, to achieve connection with the precast base plate 4, connecting channel steel 19 along the side length is provided on the outer side of the bottom ring beam 3. Specifically, the connecting channel steel 19 can be welded to the outer side of the outer steel plate 17 of the bottom ring beam 3. The number of connecting channel steel 19 is consistent with the number of sides of the cross-section of the top ring beam 2 and the bottom ring beam 3, and they are evenly arranged along the circumferential direction of the column 1. This arrangement provides good symmetry, which not only facilitates processing but also ensures uniform stress distribution. At this time, an extended channel steel 20 corresponding to the connecting channel steel 19 is provided on the top bottom side of the horizontal plate, and an extended channel steel 21 is provided on the two waist sides. The lengths of the connecting channel steel 19 and the extended channel steel 20 are the same as the length of the top bottom of the horizontal plate, and the length of the extended channel steel 21 is the same as the length of the two waist sides of the horizontal plate.

[0053] In some embodiments of the present invention, stiffening ribs 22 are welded to one flange of the connecting channel steel 19, the extended channel steel 1 20, and the extended channel steel 21. The stiffening ribs 22 ensure better strength and improve joint stiffness and seismic performance. The stiffening ribs 22 are arranged at equal intervals along the length of the channel steel, and the flanges are provided with reserved holes 23 corresponding to the high-strength bolts 24. The reserved holes 23 and the stiffening ribs 22 are arranged alternately. Adjacent horizontal plates are connected into a whole by the extended channel steel 21 and the high-strength bolts 24. Each horizontal plate is connected to the column 1 by the connecting channel steel 19, the extended channel steel 1 20, and the high-strength bolts 24, as shown. Figure 10 , Figure 11 As shown.

[0054] In some embodiments of the present invention, reference is made to Figure 8 The PEC support 6 includes a honeycomb steel section 27, with connecting end plates 29 welded to both ends of the honeycomb steel section 27. Using the honeycomb steel section 27 reduces steel consumption. Its structure is as follows: Figure 9 As shown. The space between the upper and lower flanges is filled with precast concrete 28, and a cross-shaped connecting plate 30 for connecting to the top ring beam 2 and the concrete support 5 is welded to the outside of the connecting end plate 29.

[0055] According to the above structure, since the pedestal 1 is a hollow sandwich steel tube concrete column 12, the inner and outer steel tubes serve as the template for pouring concrete. The outer steel plate 17 in the top ring beam 2 and the bottom ring beam 3, the outward channel steel in the precast base plate 4, and the honeycomb steel 27 in the PEC support 6 can also serve as part of the template, thereby simplifying the construction process and shortening the construction cycle.

[0056] In some embodiments of the present invention, the PEC support 6 is connected to the top ring beam 2 and the concrete support 5 via node plate connection nodes 7. That is, the PEC support 6 is connected to the pedestal 1 and the precast base slab 4 via node plate connection nodes 7. The node plate connection node 7 includes connecting angle steel 8, high-strength bolts 9, and node plate 10 or embedded node plate 11. The node plate 10 or embedded node plate 11 is connected to the outer wall of the top ring beam 2 and the side of the concrete support 5 near the pedestal 1, and is connected to the connecting plate at the end of the PEC support 6 via connecting angle steel 8 and high-strength bolts 9. Figure 12 As shown. For example, a pre-embedded node plate 11 is provided on one side of the concrete support 5, while a node plate 10 is provided on one side of the top ring beam 2. In conjunction with the aforementioned embodiment, the cross-shaped connecting plate 30 corresponds to the node plate 10 and the pre-embedded node plate 11 respectively, and the node plate 10, the pre-embedded node plate 11 and the cross-shaped connecting plate 30 are all provided with reserved holes 23 corresponding to the high-strength bolts 9.

[0057] According to the above structure, the components of the present invention are simple in form. The adjacent horizontal plates and the horizontal plates and the column 1 are connected by connecting channel steel and high-strength bolts. The PEC support 6 and the column 1 and the PEC support 6 and the precast base plate 4 are connected by node plates. The installation is convenient and the connection is reliable.

[0058] In terms of performance, the pedestal 1, top ring beam 2, bottom ring beam 3, precast base slab 4, and PEC support 6 all adopt a composite structure. Pedestal 1 is a hollow-core steel-concrete composite structure, top ring beam 2 and bottom ring beam 3 are steel-concrete composite structures, precast base slab 4 is a hollow steel-concrete composite slab, and PEC support 6 is a partially externally encased steel-concrete support. These structures all possess advantages such as high strength, high rigidity, and good stability, and their combination allows them to exert even greater advantages. Simultaneously, each component fully utilizes the material properties of steel and concrete, resulting in not only high load-bearing capacity but also small cross-sectional dimensions, saving concrete usage and effectively reducing self-weight.

[0059] The present invention relates to a construction method for a dry-connected prefabricated hybrid structure wind turbine support foundation, comprising the following steps:

[0060] Step 1: In the factory, complete the processing of the pedestal 1, top ring beam 2, bottom ring beam 3, precast base 4, concrete support 5 and PEC support 6; wherein the top ring beam 2 and bottom ring beam 3 are installed at the upper and lower ends of the pedestal 1; the concrete support 5 is installed on the top surface of the precast base 4.

[0061] Specifically, according to the further structures described in the foregoing embodiments, the processing method of the column 1 is as follows:

[0062] Weld stud connectors 15 to the inside of the outer steel pipe 13 and the outside of the inner steel pipe 14 to position and fix the outer steel pipe 13 and the inner steel pipe 14, and pour the sandwich concrete 16.

[0063] The processing methods for the top ring beam 2 and the bottom ring beam 3 are as follows:

[0064] Weld stud connectors 15 to the inside of the outer steel plate 17 to position and fix the outer steel plate 17, and pour the internal concrete 18.

[0065] The processing methods for the precast base slab 4 and the concrete support 5 are as follows:

[0066] Stiffening ribs 22 are welded to one side flange of connecting channel steel 19, extended channel steel 1 20 and extended channel steel 21 respectively, and the pre-reserved holes 23 are processed. Hollow steel pipe 26, extended channel steel 1 20, extended channel steel 21 and embedded node plate 11 are positioned and fixed, and concrete support 5 and precast concrete slab 25 are poured.

[0067] The processing method for PEC support 6 is as follows:

[0068] Complete the processing of the honeycomb steel 27, weld the connecting end plates 29 to both ends of the honeycomb steel 27, pour the precast concrete 28, complete the processing of the reserved holes 23 of the connecting angle steel 8, node plate 10, embedded node plate 11 and cross-shaped connecting plate 30, and weld the cross-shaped connecting plate 30 to both ends of the connecting end plate 29.

[0069] Furthermore, according to the further structures described in the foregoing embodiments, it is also necessary to weld node plates 10 and connecting channel steel 19 to the outside of the top ring beam 2 and the bottom ring beam 3, respectively.

[0070] Step 2: On-site, complete the connection between the precast base plate 4 and the bottom ring beam 3.

[0071] Specifically, according to the further structure described in the foregoing embodiments, adjacent horizontal plates are connected as a whole by extending channel steel 21 and high-strength bolt 24, and each horizontal plate is connected to the column 1 by connecting channel steel 19, extending channel steel 20 and high-strength bolt 24.

[0072] Step 3: On-site, complete the connection between the top ring beam 2 and the concrete support 5.

[0073] Specifically, according to the further structure described in the foregoing embodiments, the PEC support 6 is connected to the pedestal 1 and the precast base plate 4 by connecting angle steel 8 and high-strength bolts 9, respectively.

[0074] All components of this invention are manufactured in a standardized manner in the factory and dry-connected on site, which greatly improves the construction performance.

[0075] In use, the bottom end of the wind turbine tower and the top end of the column of the present invention are connected as a whole through flange joints.

[0076] In summary, this invention discloses a prefabricated hybrid structure wind turbine support foundation and its construction method based on dry connection, comprising a hollow-core steel-concrete composite column, a steel-concrete composite ring beam, a hollow steel-concrete composite slab, and PEC supports. Adjacent precast base slabs are connected as a whole by extended channel steel and high-strength bolts. Each precast base slab is connected to the column by connecting channel steel and high-strength bolts. The PEC supports are connected to the column and precast base slabs respectively by node plates. The prefabricated hybrid structure wind turbine support foundation fully utilizes the performance advantages of the composite structure, possessing advantages such as high load-bearing capacity, high stiffness, and light weight. Compared with traditional concrete foundations, it greatly reduces the amount of steel reinforcement binding work and significantly improves construction efficiency. This invention adopts a fully prefabricated approach, with all components manufactured in a standardized factory and dry bolt connections used on site, simplifying construction, ensuring reliable connections, and possessing broad engineering application prospects.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A prefabricated hybrid structure wind turbine support foundation based on dry connection, characterized in that, The system includes a pedestal (1), a precast base plate (4) and multiple concrete supports (5) arranged around the pedestal (1). A top ring beam (2) is provided at the upper end of the pedestal (1), and a bottom ring beam (3) is provided at the lower end. The side of the precast base plate (4) facing the bottom ring beam (3) is connected to the outer side of the bottom ring beam (3). The concrete supports (5) are arranged on the precast base plate (4). Each concrete support (5) is connected to the top ring beam (2) through a PEC support (6). Each PEC support (6) is in an inclined state, and the end connected to the top ring beam (2) is higher than the other end. The column (1) is a hollow steel-concrete composite column (12), including an outer steel pipe (13), an inner steel pipe (14) and a sandwich concrete (16); the top ring beam (2) and the bottom ring beam (3) include an outer steel plate (17) and an inner concrete (18). The inner side of the outer steel pipe (13), the outer side of the inner steel pipe (14) and the inner side of the outer steel plate (17) are all welded with stud connectors (15), and the stud connectors (15) are arranged in a square or quincunx pattern. The cross-section of the column (1) is circular, square, hexagonal or octagonal; the cross-sections of the top ring beam (2) and the bottom ring beam (3) are the same, which are square, hexagonal or octagonal; the number of PEC supports (6) is the same as the number of sides of the cross-sections of the top ring beam (2) and the bottom ring beam (3), and they are evenly arranged along the circumferential direction of the column (1); The precast base plate (4) is composed of multiple horizontal plates with isosceles trapezoidal cross sections. The number of horizontal plates is the same as the number of PEC supports (6). Each horizontal plate is arranged around the bottom ring beam (3), and its upper bottom side is connected to the outer side of the bottom ring beam (3). Each concrete support (5) is set on the top surface of a horizontal plate. The horizontal plate includes a precast concrete slab (25) and a hollow steel pipe (26) set in the precast concrete slab (25). The hollow steel pipe (26) is arranged at equal angles along the circumferential direction of the column (1). The outer side of the bottom ring beam (3) is provided with connecting channel steel (19) along the side length direction. The upper bottom side of the horizontal plate is provided with an extended channel steel one (20) corresponding to the connecting channel steel (19). The two waist sides are provided with extended channel steel two (21). The length of the connecting channel steel (19) and the extended channel steel one (20) is the same as the length of the upper bottom of the horizontal plate. The length of the extended channel steel two (21) is the same as the length of the two waist sides of the horizontal plate. Stiffening ribs (22) are welded to one side flange of the connecting channel steel (19), the first extended channel steel (20) and the second extended channel steel (21). The stiffening ribs (22) are arranged at equal intervals along the length of the channel steel, and the flanges are provided with reserved holes (23) for corresponding high-strength bolts (24). The reserved holes (23) and the stiffening ribs (22) are arranged alternately. Adjacent horizontal plates are connected into a whole by the second extended channel steel (21) and the second high-strength bolts (24). Each horizontal plate is connected to the column (1) by the connecting channel steel (19), the first extended channel steel (20) and the second high-strength bolts (24).

2. The prefabricated hybrid structure wind turbine support foundation based on dry connection according to claim 1, characterized in that, The PEC support (6) is connected to the top ring beam (2) and the concrete support (5) through a node plate connection node (7). The node plate connection node (7) includes a node plate (10) or a pre-embedded node plate (11). The node plate (10) or the pre-embedded node plate (11) is connected to the outer wall of the top ring beam (2) and the side of the concrete support (5) near the column (1). It is connected to the connecting plate at the end of the PEC support (6) through connecting angle steel (8) and high-strength bolt (9).

3. The prefabricated hybrid structure wind turbine support foundation based on dry connection according to claim 1, characterized in that, The PEC support (6) includes a honeycomb steel (27), with connecting end plates (29) welded to both ends of the honeycomb steel (27), and precast concrete (28) filling the space between the upper and lower flanges. A cross-shaped connecting plate (30) for connecting with the top ring beam (2) and the concrete support (5) is welded to the outside of the connecting end plate (29).

4. The construction method of the prefabricated hybrid structure wind turbine support foundation based on dry connection as described in any one of claims 1 to 3, characterized in that, include: 1) In the factory, the processing of the pedestal (1), top ring beam (2), bottom ring beam (3), precast base plate (4), concrete support (5) and PEC support (6) is completed; the top ring beam (2) and bottom ring beam (3) are installed at the upper and lower ends of the pedestal (1); the concrete support (5) is installed on the top surface of the precast base plate (4); 2) On-site, complete the connection between the precast base plate (4) and the bottom ring beam (3); 3) On site, complete the connection between the top ring beam (2) and the concrete support (5).

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