Land-based wind power full-precast concrete wind turbine foundation and construction method thereof

Abstract

This invention relates to the field of onshore wind power generation engineering technology, and in particular to a fully prefabricated concrete wind turbine foundation and its construction method. The foundation comprises several integrated prefabricated segmented concrete components, an outer steel beam, a central anchoring steel cylinder, and a support plate. The integrated prefabricated segmented concrete components include a support column, ribs, and a base plate, which are rotated and spliced ​​around the centerline of the wind turbine foundation to form an integral foundation. The outer steel beam is embedded in the outer edge of the integrated prefabricated segmented concrete components. Radial prestressing ducts and vertical anchor bolt ducts are pre-embedded within the components. Radial prestressing steel strands pass through the radial prestressing ducts, with the inner end of the strand anchored to the central anchoring steel cylinder and the outer end anchored to the outer steel beam. The support plate is located at the top of the support column, and vertical ducts aligned vertically with the vertical anchor bolt ducts are pre-embedded within the support plate. This invention eliminates on-site wet concrete work, features fully prefabricated dry assembly, reliable inter-segment bonding, and excellent overall load-bearing performance.

Description

Technical Field

[0001] This invention relates to the field of onshore wind power generation engineering technology, and in particular to a fully prefabricated concrete wind turbine foundation for onshore wind power and its construction method. Background Technology

[0002] Currently, cast-in-place spread foundations are commonly used for the tower foundations of onshore wind power projects in China. This technology suffers from drawbacks such as large on-site workload, high resource consumption, and long construction periods. Furthermore, construction quality is easily affected by unforeseen factors like severe weather, posing certain structural safety hazards. In scenarios involving wind farm upgrades or turbine decommissioning, cast-in-place foundations, due to their massive size, are difficult to move or dismantle and are typically permanently left in place, severely restricting the reuse of the original site and the implementation of new technologies, thus hindering the recycling of wind farm resources. In response to the national policy on prefabricated buildings, the onshore wind power industry has gradually explored the application of prefabricated wind turbine foundations in recent years. These foundations offer advantages such as reliable factory prefabrication quality, efficient and environmentally friendly on-site assembly, and ease of decommissioning and component recycling, making them an important direction for promoting the large-scale and sustainable development of the wind power industry.

[0003] For example, Chinese patent application CN211898510U discloses a multi-directional prestressed prefabricated assembled beam-slab foundation for wind turbine towers, including an upper central foundation ring, a lower central foundation ring, and multiple assembled beam-slab segmented foundations. The upper and lower central foundation rings are concentrically connected by prestressed assembly anchors to form a central ring. The multiple assembled beam-slab segmented foundations are arranged circumferentially along the central ring. Each assembled beam-slab segmented foundation is connected to the central ring by prestressed base top steel strands and base steel strands. Adjacent assembled beam-slab segmented foundations are connected by prestressed assembly bolts. However, existing prefabricated assembled wind turbine foundation technologies are still imperfect. Some implemented projects retain radial post-cast joints in the foundation structure, resulting in a large amount of wet concrete work still required on-site. This limits its construction and application in remote, harsh environments, or overseas regions, and its efficiency, quality, and environmental benefits are still significantly constrained. Moreover, existing prefabricated wind turbine foundations are prone to relative misalignment, slippage, and opening displacement between their prefabricated segments, resulting in technical problems such as insufficient inter-segment bonding performance and poor overall integrity, which seriously affect the integrity and safety of the wind turbine foundation during long-term service.

[0004] Therefore, developing a wind turbine foundation that requires no on-site concrete wet construction, is fully prefabricated and dry-assembled, has reliable inter-segment bonding, excellent overall load-bearing performance, and is easy to construct and recycle has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a fully prefabricated concrete wind turbine foundation for onshore wind power and its construction method. The fully prefabricated concrete wind turbine foundation provided by this invention eliminates on-site wet concrete work, features fully prefabricated dry assembly, ensures reliable inter-segment bonding, and exhibits excellent overall load-bearing performance. It can ensure the integrity and safety of the wind turbine foundation during long-term service, and achieves a fully prefabricated construction and installation process, significantly improving installation efficiency and facilitating construction and recycling.

[0006] The technical solution of this invention is: A fully prefabricated concrete wind turbine foundation for onshore wind power includes several integrated prefabricated segmented concrete components, an outer steel beam, a foundation center anchoring steel cylinder, and a pedestal pressure plate. Each integrated prefabricated segmented concrete component includes a pedestal, ribs, and a base plate. Several of these components are rotated and spliced ​​around the centerline of the wind turbine foundation to form an integral foundation. The outer steel beam is embedded in the outer edge of each integrated prefabricated segmented concrete component, and adjacent outer steel beams are interconnected to form a ring-shaped constraint structure. Radial prestressed ducts and vertical anchor bolt ducts are pre-embedded within each integrated prefabricated segmented concrete component. Radial prestressed steel strands pass through these ducts, with their inner ends anchored to the foundation center anchoring steel cylinder and their outer ends anchored to the outer steel beams. The pedestal pressure plate is located on the top of the pedestal, and vertical ducts aligned vertically with the vertical anchor bolt ducts are pre-embedded within the pedestal pressure plate.

[0007] Furthermore, the integrated precast segmented concrete component uses a vertically set column as the main support. The inner side of the column is integrally formed and connected to the rib beam extending outward in the horizontal direction and the bottom plate. The rib beam is located above and the bottom plate is located below. The two are arranged in parallel along the extension direction to form a cantilevered beam-slab combined load-bearing structure.

[0008] Furthermore, the outer edge steel beam is an I-shaped steel beam, which is pre-embedded inside the integrated precast segmented concrete component by pre-embedded anchor bars; adjacent outer edge steel beams are connected by high-strength bolts and butt welding.

[0009] Furthermore, the radial prestressed ducts include upper radial ducts located from the pedestal to the rib beam, and lower radial ducts located on the base plate; the vertical anchor bolt ducts and the radial prestressed ducts are arranged to avoid each other within the pedestal.

[0010] This invention designs radial prestressed ducts as upper radial ducts (column-rib area) and lower radial ducts (base plate area). Prestressed steel strands are arranged radially in the high-stress areas of the ribs and base plate, perfectly matching the stress structure of the integrated precast segmented components. The two work together to form a double-layer radial prestressed constraint system, which can meet the stress requirements of the huge overturning moment and horizontal shear force generated by wind turbine operation. Simultaneously, it generates effective positive pressure between the integrated precast segmented components, preventing misalignment or opening between segments, significantly improving the anti-slip and anti-opening capabilities of the spliced ​​surfaces, and greatly enhancing the overall integrity and long-term service safety of the foundation.

[0011] The present invention provides a method in which the vertical anchor bolt ducts and radial prestressing ducts (upper radial ducts and lower radial ducts) avoid each other within the column, which can effectively prevent interference between the ducts and subsequent installation components, ensuring that the prestressed steel strands and tower anchor bolts can be smoothly threaded, tensioned and installed at the same time, thus ensuring the smoothness and feasibility of construction and installation.

[0012] Furthermore, the foundation center anchoring steel cylinder has pre-drilled steel strand through holes aligned with the radial prestressing ducts, and the radial prestressing steel strands pass through the steel strand through holes and are anchored to the inner side of the foundation center anchoring steel cylinder.

[0013] Furthermore, the column pressure plate is composed of two layers of precast concrete slabs, which are stacked and installed with staggered joints.

[0014] Furthermore, it also includes high-strength prestressed anchor bolts for wind turbine towers, with lower anchor plates and upper anchor plates at both ends; the high-strength prestressed anchor bolts for wind turbine towers pass vertically through the vertical anchor bolt channel and the vertical channel of the column pressure plate, with the lower end connected to the lower anchor plate and the upper end used to connect the bottom flange of the wind turbine tower to the upper anchor plate.

[0015] Furthermore, the radial prestressed duct, the vertical anchor bolt duct, and the inner diameter of the vertical duct are 60mm-80mm.

[0016] This invention also provides a construction method for a fully prefabricated concrete wind turbine foundation for onshore wind power, used to construct the aforementioned fully prefabricated concrete wind turbine foundation for onshore wind power, comprising the following steps: S1 is a prefabricated integrated precast concrete component in the factory, with reserved vertical anchor bolt holes and radial prestressing holes, and pre-embedded outer edge steel beams; S2 is used to install and position the lower anchor plate of the high-strength prestressed anchor bolts on the wind turbine tower at the construction site. S3 involves hoisting and assembling several integrated precast segmented concrete components sequentially around the centerline of the wind turbine foundation; S4 connects and fixes the outer edge steel beams of adjacent integrated precast segmented concrete components; S5 completed the placement and installation of the foundation center anchor steel cylinder; S6 completes the installation and tensioning anchoring of prestressed steel strands in the integrated precast segmented concrete component. The two ends of the prestressed steel strands are respectively anchored to the outer side of the web of the foundation center anchoring steel cylinder and the outer edge steel beam. S7 has a pillar pressure plate installed on the top of the pillar; S8 completed the installation of high-strength prestressed anchor bolts for the wind turbine tower; S9 completed the high-strength grouting construction on the top of the column pressure plate, the anchor bolts on the anchor plates, and the fastening construction of the bottom flange of the wind turbine tower.

[0017] The integrated precast segmented concrete component technical solution proposed in this invention features a simple precast process, and the steel content of the components can be further reduced through prestressing technology, resulting in lower overall costs. This invention combines prestressing technology with prefabricated structures, fully leveraging the advantages of both. All components in the structure are precast in a standardized factory and then transported to the site for integral connection through component splicing and prestressed tensioning and anchoring. This enables completely dry construction on site, effectively avoiding the wet construction processes such as large-scale cast-in-place concrete pouring in traditional processes, thus improving construction efficiency, construction quality, and structural integrity.

[0018] The key condition for the successful construction of prefabricated wind turbine foundations lies in the reliable contact preload and overall constraint between the prefabricated segments after assembly. This invention tensions and anchors the prestressed steel strands between segments, subjecting each segment to radial preload towards the foundation center. This creates continuous and stable contact compressive stress at the segment contact surfaces. Since the contact surfaces between segments are made of concrete, the contact pressure generates interfacial static friction. This, combined with the circumferential constraint of the outer anchoring steel beams and the central tie-in effect of the foundation's central anchoring steel cylinder, effectively restricts relative misalignment, slippage, and opening displacement between the prefabricated segments. This significantly improves the overall load-bearing capacity and structural stability of the wind turbine foundation, ensuring its integrity and safety during long-term service. It solves the technical problems of insufficient inter-segment bonding performance and poor overall integrity in prefabricated wind turbine foundations.

[0019] The technical solution of this invention further reserves radial prestressing ducts (upper radial ducts and lower radial ducts) in the area of ​​the rib beam and the base plate for threading prestressed steel strands and achieving tensioning and anchoring, thereby achieving the following technical effects: ① The prestressed steel strands in the upper and lower radial ducts also serve as the main load-bearing reinforcement of the rib beam and the base plate, using prestressed steel strands to replace part of the ordinary steel bars, effectively reducing the amount of ordinary steel bars used and improving economy; ② The prestressed steel strands reliably connect the outer edge steel beams to the foundation center anchoring steel cylinder, so that each prefabricated segment component forms a cohesive overall structure. In addition, after the prefabricated segment components are completed in the field for circumferential enclosing splicing, this invention further tightens the splicing nodes of the outer edge steel beams and installs the foundation center anchoring steel cylinder in place. Through the above-mentioned structural connection and prestressing connection, reliable connection and overall constraint between each prefabricated segment are achieved.

[0020] The integrated precast segmented concrete component used in this invention is an integral segmented structure where the columns, ribs, and base plate are precast as a single unit. It maintains continuity at the points of greatest stress intersection between the columns and ribs, and between the columns and base plate, eliminating on-site splicing nodes. On-site construction only requires sequential hoisting and splicing of the segments along the circumferential direction to quickly form a complete wind turbine foundation structure. Compared to existing technologies, this invention completely eliminates on-site assembly nodes in high-stress areas of the wind turbine foundation, effectively avoiding the fatigue risks of bolted connections and welded joints under cyclic dynamic loads. The structural stress is more clearly defined, and the overall stiffness and long-term service safety are significantly improved, making it more suitable for engineering requirements where wind turbine foundations bear cyclic reciprocating dynamic loads.

[0021] Compared with the prior art, the present invention has the following advantages: (1) The onshore wind power fully prefabricated concrete wind turbine foundation provided by the present invention has a simple structure and a clear force transmission path. All components are produced in the factory in a standardized manner, with higher precision, uniform size and stable quality. There is no concrete wet operation process on the construction site, and transportation and hoisting are more convenient. It can effectively meet the construction conditions requirements of remote areas, overseas areas and areas with harsh environments, and the construction quality is stable and controllable.

[0022] (2) In the integrated precast segmented concrete component provided by the present invention, in the area of ​​the component with large stress, prestressing technology is adopted to give full play to the material characteristics of high tensile strength of prestressed steel strand and good compressive performance of concrete material, which can effectively reduce the amount of ordinary steel bars in the component and has good economic benefits; and the stress continuity is better, the column-rib beam-base plate is integrally formed, the stress transmission is smooth, and there are no weak splicing surfaces.

[0023] (3) The present invention can effectively connect the precast segmented concrete components into one unit by setting a foundation center anchoring steel cylinder inside the wind turbine foundation and setting an annular steel beam on the outer edge of the wind turbine foundation; the connection node form is mature and has good manufacturing and construction feasibility.

[0024] (4) The wind turbine foundation body of the present invention is composed of only integrated precast segmented concrete components. The number of component types is small, which can reduce the number of molds processed in the factory.

[0025] (5) Compared with existing prefabricated wind turbine foundations, the present invention realizes a fully prefabricated construction and installation process, which significantly improves the installation efficiency and avoids the wet operation process of on-site post-cast concrete, and has good application prospects. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a fully prefabricated concrete wind turbine foundation for onshore wind power according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the central anchoring steel cylinder and outer edge steel beam of a fully prefabricated concrete wind turbine foundation for onshore wind power, according to an embodiment of the present invention. Figure 3 This is a semi-structural schematic diagram of a fully prefabricated concrete wind turbine foundation for onshore wind power according to an embodiment of the present invention. Figure 4 This is a structural schematic diagram (angle 1) of an integrated precast segmented concrete component for a fully precast concrete wind turbine foundation for onshore wind power, according to an embodiment of the present invention. Figure 5 This is a schematic diagram (angle 2) of an integrated precast segmented concrete component for a fully precast concrete wind turbine foundation for onshore wind power, according to an embodiment of the present invention.

[0027] In the diagram: 1-Integrated precast segmented concrete component; 2-Outer steel beam; 3-Column pressure plate; 4-Foundation center anchoring steel cylinder; 101-Rib beam; 103-Base plate; 104-Column; 105-Vertical anchor bolt duct; 106-Upper radial duct; 107-Lower radial duct. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify 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 invention.

[0030] The present invention will be further described below with reference to the accompanying drawings: Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 This embodiment provides a fully prefabricated concrete wind turbine foundation for onshore wind power, including several integrated prefabricated segmented concrete components 1, outer steel beams 2, foundation center anchoring steel cylinders 4, and column pressure plates 3; the integrated prefabricated segmented concrete components 1 include columns 104, rib beams 101, and base plates 103. The integrated prefabricated segmented concrete components (1) are supported by vertically arranged columns (104). The inner side of the columns (104) is integrally formed and connected to the rib beams (101) extending outward in the horizontal direction and the base plates (103). The rib beams (101) are located above and the base plates (103) are located below. The two are arranged in parallel along the extension direction and together form a cantilevered beam-slab combined load-bearing structure.

[0031] The outer steel beam 2 is embedded in the outer edge of the integrated precast segmented concrete component 1, and adjacent outer steel beams 2 are connected to form a ring-shaped constraint structure. Specifically, the outer steel beam 2 is set at the outer end of the rib beam 101 and the base plate 103, with its upper part rigidly connected to the end of the rib beam 101 and its lower part rigidly connected to the end of the base plate 103, forming an overall reinforcement and constraint on the end of the cantilever structure. The column 104, rib beam 101, base plate 103 and outer steel beam 2 together constitute a complete integrated precast segmented concrete component load-bearing system. Several integrated precast segmented concrete components 1 are rotated and spliced ​​around the center line of the wind turbine foundation to form an integral foundation. The integrated precast segmented concrete component 1 is pre-embedded with radial prestressed ducts and vertical anchor bolt ducts 105, and the vertical anchor bolt ducts 105 are used for the installation of high-strength prestressed anchor bolts for the wind turbine tower.

[0032] The radial prestressed steel strands are threaded through the radial prestressed ducts. The inner end of the radial prestressed steel strands is anchored to the central anchoring steel cylinder 4 of the foundation, and the outer end is anchored to the outer edge steel beam 2. The column pressure plate 3 is set on the top of the column 104, and the column pressure plate 3 has a vertical duct pre-embedded in it, which is aligned vertically with the vertical anchor bolt duct 105.

[0033] The outer edge steel beam 2 is an I-shaped steel beam, which is pre-embedded in the integrated precast segmented concrete component 1 by pre-embedded anchor bars; the adjacent outer edge steel beams 2 are connected by high-strength bolts and / or butt welding. Specifically, the flanges of the outer edge steel beam 2 are connected by butt welding, and the web of the outer edge steel beam 2 is connected by high-strength bolts.

[0034] like Figure 4 , Figure 5 As shown, the radial prestressed ducts include an upper radial duct 106 embedded in the wind turbine foundation from the pedestal to the rib beam, and a lower radial duct 107 embedded in the bottom plate in the wind turbine foundation. Both the upper radial duct 106 and the lower radial duct 107 are used for the threading, installation and anchoring of prestressed steel strands, and both serve as the main reinforcing bars of the corresponding load-bearing components (rib beam, bottom plate), while also taking into account the dual anchoring effect on the inner and outer sides of the components. After the steel strands are threaded, the inner ends are uniformly anchored to the central anchoring steel cylinder 4 of the foundation, and the outer ends are uniformly anchored to the outer edge steel beam 2. The prestressing effect synergistically improves the overall load-bearing capacity and stability of the foundation. The vertical anchor bolt holes 105, upper radial holes 106, and lower radial holes 107 are arranged in a mutually avoidant manner inside the column. In the early stages of wind turbine foundation design, the number and diameter of the vertical anchor bolts are determined in coordination with the wind turbine tower manufacturer and anchor bolt manufacturer. Based on this, the positions of the upper radial holes 106 and lower radial holes 107 within the segmented components are determined, effectively avoiding interference between the holes and subsequent installation components, ensuring smooth and feasible construction and installation. The inner diameter of the upper radial holes 106, lower radial holes 107, vertical anchor bolt holes 105, and the vertical holes pre-embedded in the column pressure plate is 60mm-80mm.

[0035] The foundation center anchoring steel cylinder 4 has pre-drilled holes for steel strands aligned with the radial prestressing ducts. The radial prestressing steel strands pass through the steel strand holes and are then anchored to the inner side of the foundation center anchoring steel cylinder 4.

[0036] The column pressure plate consists of two layers of precast concrete slabs, which are stacked and installed with staggered joints.

[0037] The onshore wind power precast concrete wind turbine foundation also includes high-strength prestressed anchor bolts for the wind turbine tower. The high-strength prestressed anchor bolts for the wind turbine tower are provided with a lower anchor plate and an upper anchor plate at both ends. The high-strength prestressed anchor bolts for the wind turbine tower pass vertically through the vertical anchor bolt channel 105 and the vertical channel of the column pressure plate 3. The lower end is connected to the lower anchor plate, and the upper end is used to connect the bottom flange of the wind turbine tower to the upper anchor plate.

[0038] A construction method for a fully prefabricated concrete wind turbine foundation for onshore wind power, used to construct structures such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The aforementioned onshore wind turbine prefabricated concrete foundation includes the following steps: S1 completes the processing of integrated precast segmented concrete component 1 in the precast component factory, including: ordinary steel bar binding of columns, base plate and rib beams; pre-drilling of prestressed anchor bolts and prestressed steel strands (pre-drilling of vertical anchor bolt ducts 105 and radial prestressing ducts); processing and fabrication of outer steel beam 2 and pre-embedding of anchor bars; overall concrete pouring and component curing of integrated precast segmented concrete component 1. S2 installs and positions the lower anchor plate of the high-strength prestressed anchor bolts of the wind turbine tower at the construction site, completing the positioning and installation of the lower anchor plate and support components of the high-strength prestressed anchor bolts of the wind turbine tower. S3 At the construction site, several integrated precast segmented concrete components 1 were hoisted into place and spliced ​​around the center line of the wind turbine foundation in sequence; S4 At the construction site, fasteners and welding are carried out on the joint nodes of the outer edge steel beams 2 of the adjacent integrated precast concrete slab components 1. S5 completed the placement and installation of the foundation center anchor steel cylinder 4 at the construction site; S6 completed the installation and tensioning anchoring of prestressed steel strands in the integrated precast segmented concrete component 1 at the construction site. The two ends of the prestressed steel strands were respectively anchored to the outer side of the web of the foundation center anchoring steel cylinder 4 and the outer edge steel beam 2. S7 completed the hoisting, positioning, and installation of the top of the integrated precast segmented concrete component 1, the pedestal 104, after the pedestal pressure plate 3 was spliced ​​and tightened by the prestressed steel strand tensioning construction. S8 completed the installation of high-strength prestressed anchor bolts for the wind turbine tower at the construction site, passing through the pre-reserved holes in the integrated precast segmented concrete component 1 and the column pressure plate 3, which had been spliced ​​and tightened. S9 completed the high-strength grouting of the top of the column pressure plate 3, the fastening of the anchor bolts and the bottom flange of the wind turbine tower at the construction site.

[0039] Specifically, such as Figure 3 As shown, after all the integrated precast segmented concrete components 1 are hoisted, positioned, and installed in a fixed direction (clockwise or counterclockwise), the foundation center anchoring steel cylinder 4 is positioned and installed. The foundation center anchoring steel cylinder 4 is hoisted and positioned in the center of the wind turbine foundation. The foundation center anchoring steel cylinder 4 has a reserved channel for the prestressed steel strands to pass through. During installation, the center of this channel is aligned with the center of the reserved upper radial channel 106 and lower radial channel 107 on the integrated precast segmented concrete component 1.

[0040] like Figure 3As shown, after all the integrated precast concrete components 1 are hoisted, positioned and installed in a fixed direction (clockwise or counterclockwise), the joint nodes of the adjacent outer steel beams 2 are fastened and connected. The nodes are connected by fasteners and welding. Specifically, the flanges of the outer steel beams 2 are connected by butt welding and the web of the outer steel beams 2 is connected by high-strength bolts.

[0041] like Figure 4 and Figure 5 As shown, in one embodiment of the present invention, after the prestressed steel strand passes through the upper radial channel 106 and the lower radial channel 107 pre-reserved in the integrated precast segmented concrete component 1, the two ends of the prestressed steel strand are respectively anchored to the inner side of the foundation center anchoring steel cylinder 4 and the outer side of the outer edge steel beam 2.

[0042] like Figure 3 As shown, after completing the prestressed steel strand tensioning and anchoring construction in all integrated precast segmented concrete components 1, the column pressure plate 3 is hoisted, positioned, and installed. The column pressure plate 3 is provided with vertically embedded channels for the installation of high-strength prestressed anchor bolts for the wind turbine tower. During installation, it is aligned vertically with the vertical anchor bolt channels of the column 104 of the integrated precast segmented concrete component 1 to facilitate the installation of high-strength prestressed anchor bolts for the wind turbine tower.

[0043] like Figure 1 As shown, the installation of high-strength prestressed anchor bolts for the wind turbine tower is completed, passing through the pre-reserved holes in the integrated precast segmented concrete component 1 and the column pressure plate 3, which have been spliced ​​and tightened; the high-strength grouting material on the top of the column pressure plate 3 is applied, and the anchor plates on the anchor bolts and the bottom flange of the wind turbine tower are tightened.

[0044] This invention provides a fully prefabricated concrete wind turbine foundation for onshore wind power (fully prefabricated ribbed concrete wind turbine foundation). Combining prestressing technology, this foundation system fully utilizes the performance advantages of different materials. All components can be prefabricated in the factory and directly assembled and installed on site. The wind turbine foundation of this invention has the characteristics of reasonable structural stress form, strong adaptability to construction conditions, and environmentally friendly and efficient construction process, and has broad application prospects.

Claims

1. A fully prefabricated concrete wind turbine foundation for onshore wind power, characterized in that, The foundation includes several integrated precast segmented concrete components (1), outer edge steel beams (2), a foundation center anchoring steel cylinder (4), and abutment pressure plates (3). The integrated precast segmented concrete components (1) include abutments (104), rib beams (101), and a base plate (103). Several integrated precast segmented concrete components (1) are rotated and spliced ​​around the center line of the wind turbine foundation to form an integral foundation. The outer edge steel beams (2) are embedded in the outer edge of the integrated precast segmented concrete components (1), and adjacent to the outer edge steel beams (2) The components are interconnected to form a ring-shaped constraint structure; the integrated precast segmented concrete component (1) is pre-embedded with radial prestressed ducts and vertical anchor bolt ducts (105), and radial prestressed steel strands are passed through the radial prestressed ducts. The inner end of the radial prestressed steel strands is anchored to the foundation center anchoring steel cylinder (4), and the outer end is anchored to the outer edge steel beam (2); the column pressure plate (3) is set on the top of the column (104), and the column pressure plate (3) is pre-embedded with vertical ducts aligned vertically with the vertical anchor bolt ducts.

2. The fully prefabricated concrete wind turbine foundation for onshore wind power according to claim 1, characterized in that, The integrated precast segmented concrete component (1) is supported by a vertically set column (104). The inner side of the column (104) is integrally formed and connected to the rib beam (101) extending outward in the horizontal direction and the base plate (103). The rib beam (101) is located above and the base plate (103) is located below. The two are arranged in parallel along the extension direction and together form a cantilevered beam-slab combined load-bearing structure.

3. The fully prefabricated concrete wind turbine foundation for onshore wind power according to claim 1, characterized in that, The outer edge steel beam (2) is an I-shaped steel beam, which is pre-embedded in the interior of the integrated precast segmented concrete component (1) by pre-embedded anchor bars; the adjacent outer edge steel beams (2) are connected by high-strength bolts and butt welding.

4. The fully prefabricated concrete wind turbine foundation for onshore wind power according to claim 1, characterized in that, The radial prestressed ducts include an upper radial duct (106) located between the column and the rib, and a lower radial duct (107) located in the base plate; the vertical anchor bolt ducts (105) and the radial prestressed ducts are arranged to avoid each other within the column.

5. The fully prefabricated concrete wind turbine foundation for onshore wind power according to claim 1, characterized in that, The foundation center anchoring steel cylinder (4) has a pre-drilled steel strand through hole aligned with the radial prestressing channel. The radial prestressing steel strand passes through the steel strand through hole and is anchored to the inner side of the foundation center anchoring steel cylinder.

6. The fully prefabricated concrete wind turbine foundation for onshore wind power according to claim 1, characterized in that, The column pressure plate (3) consists of two layers of precast concrete slabs, which are stacked and installed with staggered joints.

7. The fully prefabricated concrete wind turbine foundation for onshore wind power according to claim 1, characterized in that, It also includes high-strength prestressed anchor bolts for wind turbine towers, with lower anchor plates and upper anchor plates at both ends; the high-strength prestressed anchor bolts for wind turbine towers pass vertically through the vertical anchor bolt channel and the vertical channel of the column pressure plate, with the lower end connected to the lower anchor plate and the upper end used to connect the bottom flange of the wind turbine tower to the upper anchor plate.

8. The fully prefabricated concrete wind turbine foundation for onshore wind power according to claim 1, characterized in that, The radial prestressed duct, vertical anchor bolt duct, and the inner diameter of the vertical duct are 60mm-80mm.

9. A construction method for a fully prefabricated concrete wind turbine foundation for onshore wind power, characterized in that, The method for constructing a fully prefabricated concrete wind turbine foundation for onshore wind power as described in any one of claims 1-8 includes the following steps: S1 is a prefabricated integrated precast concrete component in the factory, with reserved vertical anchor bolt holes and radial prestressing holes, and pre-embedded outer edge steel beams; S2 is used to install and position the lower anchor plate of the high-strength prestressed anchor bolts on the wind turbine tower at the construction site. S3 involves hoisting and assembling several integrated precast segmented concrete components sequentially around the centerline of the wind turbine foundation; S4 connects and fixes the outer edge steel beams of adjacent integrated precast segmented concrete components; S5 completed the placement and installation of the foundation center anchor steel cylinder; S6 completes the installation and tensioning anchoring of prestressed steel strands in the integrated precast segmented concrete component. The two ends of the prestressed steel strands are respectively anchored to the outer side of the web of the foundation center anchoring steel cylinder and the outer edge steel beam. S7 has a pillar pressure plate installed on the top of the pillar; S8 completed the installation of high-strength prestressed anchor bolts for the wind turbine tower; S9 completed the high-strength grouting construction on the top of the column pressure plate, the anchor bolts on the anchor plates, and the fastening construction of the bottom flange of the wind turbine tower.

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