Lattice type concrete wind power tower column foundation

Abstract

The utility model discloses a lattice formula concrete wind power tower column foundation, including a plurality of around wind power tower vertical center line circumferential uniform distribution's foundation structure, the foundation structure includes the foundation main part buried in the foundation and is used for and the wind power tower bottom tower column links the platform column, the platform column is located in the foundation main part, the outer wall of platform column and the inner wall of foundation main part are equipped with a plurality of first connecting plate, and the outer wall between adjacent foundation main part is equipped with the second connecting plate for realizing the connection of adjacent foundation main part. The utility model discloses a lattice formula concrete wind power tower column foundation has the advantages such as light self weight, simple structure, reasonable stress, high anti -pulling bearing capacity, good economy, convenient construction etc.

Description

Technical Field

[0001] This utility model belongs to the field of wind power generation technology, and in particular relates to a wind turbine tower foundation. Background Technology

[0002] Wind energy is one of the fastest-growing emerging renewable energy sources in recent years, and large-capacity stationary wind turbines have become an important growth point in the global wind power market. Large-capacity wind turbines mean greater dynamic and static loads and taller wind turbine towers, placing higher demands on the tower structure. As the tower height increases, the bending moment at the base increases exponentially, significantly increasing the requirements for the tower base's tensile strength. Therefore, a suitable foundation structure is needed to ensure sufficient load-bearing capacity to support the normal operation of the wind turbine tower.

[0003] To address the aforementioned challenges, Chinese patent application CN118375565A discloses a lattice-type wind turbine tower. This patent improves upon traditional foundation forms, proposing a novel gravity foundation with high uplift bearing capacity, a smaller footprint, and superior economic efficiency. However, the gravity foundation structure disclosed in this patent still suffers from the following technical defects: First, each foundation unit participates in uplift resistance independently, resulting in insufficient overall synergistic load-bearing capacity of the foundation. Second, the anchoring between the foundation structure and the ground relies mainly on the weight of backfill soil and the self-weight of the tower, which greatly limits its applicability in soft soil foundations with low bearing capacity and high compressibility. Therefore, there is an urgent need to develop a novel foundation structure suitable for lattice-type concrete wind turbine towers, possessing both high uplift bearing capacity and broad geological adaptability. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the deficiencies and defects mentioned in the background art above, and to provide a lattice-type concrete wind turbine tower column foundation with reasonable stress distribution, high tensile bearing capacity, and wide adaptability.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows:

[0006] A lattice-type concrete wind turbine tower column foundation includes multiple foundation structures evenly distributed circumferentially around the vertical centerline of the wind turbine tower. The foundation structure includes a main foundation body embedded in the ground and a platform column for connecting to the bottom column of the wind turbine tower. The platform column is located in the main foundation body. Multiple first connecting plates are provided between the outer wall of the platform column and the inner wall of the main foundation body. Second connecting plates are provided between the outer walls of adjacent main foundation bodies for connecting adjacent main foundation bodies.

[0007] In the above-mentioned lattice-type concrete wind turbine tower column foundation, preferably, the second connecting plate is arranged on the connecting line of the axial center points of adjacent foundation bodies, the second connecting plate extends outward from the first connecting plate and is kept on the same straight line as the first connecting plate, and the height of the second connecting plate is the same as the height of the foundation body.

[0008] In the aforementioned lattice-type concrete wind turbine tower column foundation, preferably, the second connecting plate is I-shaped, including an upper flange plate, a lower flange plate, and a web plate. The web plate is disposed between the upper flange plate and the lower flange plate, and the thickness b2 of the upper flange plate and the lower flange plate is 0.6-0.8m, and the thickness b1 of the web plate is 0.3-0.5m.

[0009] In the above-mentioned lattice-type concrete wind turbine tower column foundation, preferably, the first connecting plate extending to the second connecting plate has the same cross-sectional shape as the second connecting plate.

[0010] In the above-mentioned lattice-type concrete wind turbine tower column foundation, preferably, the foundation body and the column are coaxially arranged, multiple first connecting plates are evenly distributed along the circumference of the column, a backfill groove is provided between each first connecting plate, the wall thickness of the first connecting plate is 0.2-0.8m, the first connecting plate and the upper surface of the foundation body are flush, and the upper surface of the foundation body is open.

[0011] In the above-mentioned lattice-type concrete wind turbine tower column foundation, preferably, the upper end of the column includes a protruding part extending out of the foundation, the diameter of the protruding part is 3.2-3.6m, the outer diameter of the protruding part is larger than that of the bottom column of the wind turbine tower, and the protruding part is provided with a doorway.

[0012] In the above-mentioned lattice-type concrete wind turbine tower column foundation, preferably, the main body of the foundation is cylindrical, with an outer diameter of 8-15m, a height of 4-8m, and a side wall thickness of 0.3-0.6m.

[0013] In the aforementioned lattice-type concrete wind turbine tower column foundation, preferably, the bottom of the foundation body is provided with a base plate, and multiple piles extending into the ground are provided below the base plate.

[0014] In the above-mentioned lattice-type concrete wind turbine tower column foundation, preferably, the pile foundation is evenly arranged along the circumferential edge of the base plate, and the pile foundation is located at the intersection of the foundation body and the first connecting plate.

[0015] In the aforementioned lattice-type concrete wind turbine tower column foundation, preferably, the pile foundation and the base slab are connected by cast-in-place concrete. The hollow structure at the upper end of the pile foundation is provided with a support plate for bearing the cast-in-place concrete. The hollow structure at the upper end of the pile foundation is provided with longitudinal reinforcement and circumferential stirrups outside the longitudinal reinforcement. The base slab is provided with base slab reinforcement. The longitudinal reinforcement extends into the base slab and connects with the base slab reinforcement. The height H of the longitudinal reinforcement extending into the base slab is 1-1.2m. The cast-in-place concrete is cast in the hollow structure at the upper end of the pile foundation and is integrally cast with the base slab.

[0016] The construction method for the lattice-type concrete wind turbine tower column foundation of this utility model is as follows:

[0017] S1. After the site selection is completed, excavate multiple foundation pits at the wind turbine tower construction site and drive pre-set pile foundations into each foundation pit;

[0018] S2. Support the bottom support plate on the pile foundation and arrange the steel cage;

[0019] S3. Erect formwork and pour the base slab, foundation body, first connecting plate, second connecting plate and column in the foundation pit where the pre-set piles are driven;

[0020] S4. After the concrete reaches the design strength, backfill the soil and rock into the backfill trench of the main foundation, and at the same time bury the entire concrete gravity foundation structure in the foundation, with only the protruding part of the column exposed.

[0021] S5. After the earthwork backfilling is completed and meets the design requirements, the installation of the bottom tower column of the wind turbine can be carried out on the protruding part of the column.

[0022] This utility model discloses a lattice-type concrete wind turbine tower foundation, which integrates independent foundation structures into a cohesive, load-bearing structure through a second connecting plate. Its tensile strength primarily originates from two parts: the gravity effect formed by the weight of the backfill soil and the foundation structure itself, and the anchoring force provided by the pile foundation system. This gravity-anchoring synergistic mechanism effectively improves the foundation's tensile strength and bearing area. Compared to traditional wind turbine tower foundations, this utility model significantly reduces concrete usage and optimizes structural efficiency, thereby effectively lowering project costs.

[0023] Compared with the prior art, the advantages of this utility model are:

[0024] This utility model's lattice-type concrete wind turbine tower column foundation utilizes backfill trenches formed between the first connecting plates within the foundation main body. The added weight effectively improves the tensile strength of the foundation structure, reducing concrete usage. A second connecting plate connects the independent foundation main bodies into a single unit, allowing multiple independent foundation main bodies to share the load collaboratively. A more preferable solution involves simultaneously installing pile foundations at the bottom of the foundation main body, enhancing the connection between the foundation main body and the ground, and improving the tensile strength of the foundation structure. Compared to traditional wind turbine tower foundations, this utility model's lattice-type concrete wind turbine tower column foundation utilizes the combined gravity of backfill soil and the concrete gravity foundation structure, along with the collaborative tensile strength of the pile foundations, to significantly improve structural efficiency, effectively reduce project costs, enhance economy and practicality, and contribute to the development of wind turbine towers towards higher power and greater height.

[0025] Overall, the lattice-type concrete wind turbine tower column foundation of this utility model has advantages such as light weight, simple structure, reasonable stress distribution, high tensile strength, good economy, and easy construction. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the lattice-type concrete wind turbine tower column foundation and the connection between the bottom columns of the wind turbine tower (the foundation is not shown).

[0028] Figure 2 This is a schematic diagram of the structure of the lattice-type concrete wind turbine tower column foundation as an example.

[0029] Figure 3 This is a schematic diagram of a single basic structure in an embodiment.

[0030] Figure 4 This is a top view of the lattice-type concrete wind turbine tower column foundation as an example.

[0031] Figure 5 This is a schematic diagram of the connection structure between the pile foundation and the bottom slab of the main foundation body, as shown in the embodiment.

[0032] Legend

[0033] 1. Basic structure; 11. Main foundation; 12. First connecting plate; 13. Backfill trench; 14. Bottom slab; 141. Bottom slab reinforcement; 2. Abutment; 21. Protrusion; 22. Doorway; 3. Second connecting plate; 4. Pile foundation; 41. Longitudinal reinforcement; 42. Circumferential stirrups; 43. Support plate; 44. Cast-in-place concrete; 5. Bottom tower column of wind turbine tower. Detailed Implementation

[0034] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0035] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0036] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0037] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0038] Example:

[0039] like Figures 1-5 As shown, the lattice-type concrete wind turbine tower column foundation of this embodiment includes multiple foundation structures 1 evenly distributed circumferentially around the vertical centerline of the wind turbine tower. Each foundation structure 1 includes a foundation body 11 embedded in the ground and a platform 2 for connecting to the tower column 5 at the bottom of the wind turbine tower. The platform 2 is located within the foundation body 11. Multiple first connecting plates 12 are provided between the outer wall of the platform 2 and the inner wall of the foundation body 11. Second connecting plates 3 are provided between the outer walls of adjacent foundation bodies 11 to connect them. Reinforcing steel bars are arranged within the first connecting plates 12 and the second connecting plates 3. In this embodiment, the independent foundation bodies 11 are connected into a single unit through the second connecting plates 3, allowing multiple independent foundation bodies 11 to share the load collaboratively, which is beneficial for improving mechanical performance.

[0040] In this embodiment, the second connecting plate 3 is arranged on the axis connecting line of the adjacent base body 11. The second connecting plate 3 extends outward from the first connecting plate 12 and is kept on the same straight line as the first connecting plate 12. The height of the second connecting plate 3 is the same as the height of the base body 11.

[0041] like Figure 3 As shown, in this embodiment, the second connecting plate 3 is I-shaped, including an upper flange plate, a lower flange plate, and a web plate. The web plate is located between the upper and lower flange plates, and the thickness b2 of the upper and lower flange plates is 0.6-0.8m, while the thickness b1 of the web plate is 0.3-0.5m. The I-shaped cross-section of the second connecting plate 3 can achieve the maximum bending bearing capacity and stiffness with minimal material usage, improving structural efficiency and reducing project costs. The first connecting plate 12 extends outward to form the second connecting plate 3. This design maintains the continuity of the connecting plate cross-section structure, integrates the reinforcement arrangement of the first connecting plate 12 and the second connecting plate 3, and ensures that the bearing capacity of the connecting plate is not reduced due to the obstruction of the side wall of the foundation main body 11.

[0042] In this embodiment, the first connecting plate 12, which extends to form the second connecting plate 3, has the same cross-sectional shape as the second connecting plate 3.

[0043] In this embodiment, the foundation body 11 and the pedestal 2 are coaxially arranged. Multiple first connecting plates 12 are evenly distributed around the circumference of the pedestal 2. A backfill groove 13 is provided between each first connecting plate 12. The wall thickness of the first connecting plate 12 is 0.2-0.8m. The first connecting plate 12 and the upper surface of the foundation body 11 are flush. The upper surface of the foundation body 11 is open. The backfill groove 13 is used for backfilling and weighting.

[0044] In this embodiment, the upper end of the column 2 includes a protrusion 21 extending out of the foundation. The diameter of the protrusion 21 is 3.2-3.6m. The outer diameter of the protrusion 21 is larger than that of the bottom column 5 of the wind turbine tower. The protrusion 21 is provided with a doorway 22 to facilitate personnel to enter the column 2 to tension the prestressing tendons.

[0045] In this embodiment, the base body 11 is cylindrical, with an outer diameter of 8-15m, a height of 4-8m, and a side wall thickness of 0.3-0.6m.

[0046] In this embodiment, a base plate 14 is provided at the bottom of the foundation body 11, and multiple piles 4 extending into the foundation are provided below the base plate 14. The piles 4 are used to anchor the foundation body 11 and enhance the connection between the foundation body 11 and the foundation. The length of the piles 4 is set according to the on-site survey, and the piles 4 are prefabricated.

[0047] In this embodiment, the pile foundation 4 is evenly arranged along the circumferential edge of the base plate 14, and the pile foundation 4 is located at the intersection of the foundation body 11 and the first connecting plate 12.

[0048] like Figure 5As shown, in this embodiment, the pile foundation 4 and the base slab 14 are connected by cast-in-place concrete 44. The hollow structure at the upper end of the pile foundation 4 is provided with a support plate 43 for bearing the cast-in-place concrete 44. The hollow structure at the upper end of the pile foundation 4 is provided with longitudinal steel bars 41 and circumferential stirrups 42 outside the longitudinal steel bars 41. The base slab 14 is provided with base slab steel bars 141. The longitudinal steel bars 41 extend into the base slab 14 and are connected to the base slab steel bars 141. The height H of the longitudinal steel bars 41 extending into the base slab 14 is 1-1.2m. The cast-in-place concrete 44 is cast in the hollow structure at the upper end of the pile foundation 4 and is integrally cast with the base slab 14 to connect the pile foundation 4 and the foundation body 11. The steel cage arranged at the upper end of the pile foundation 4 extends into the bottom slab 14 and is poured together with the main foundation 11. This solves two problems: first, it solves the problems of high operational difficulty, high quality control difficulty, and long construction period when connecting the pile foundation 4 and the foundation structure 1; second, it uses cast-in-place concrete to achieve a rigid connection between the pile foundation 4 and the foundation structure 1, making them an integral whole and enhancing the cooperative stress performance between the pile foundation 4 and the foundation structure 1.

[0049] In this embodiment, the distance between adjacent foundation bodies 11 can be 10-20m, and the length of the second connecting plate 3 is determined according to the distance between adjacent foundation bodies 11 in the engineering requirements. The number of foundation bodies 11 can be determined according to the engineering requirements, and their planar layout can adopt geometric configurations such as triangles, quadrilaterals, hexagons, or rings. The layout and number of pile foundations 4 can be determined according to the engineering requirements.

[0050] The construction method for the lattice-type concrete wind turbine tower column foundation of this embodiment may include the following steps:

[0051] S1. After the site selection is completed, excavate multiple foundation pits at the wind turbine tower construction site and drive pre-set piles 4 into each foundation pit.

[0052] S2. Support the bottom support plate 43 on the pile foundation 4 and arrange longitudinal steel bars 41 and circumferential stirrups 42.

[0053] S3. In the foundation pit into which the pre-set piles 4 are driven, the foundation body 11, the column 2 are erected and poured (the bottom plate 14, the first connecting plate 12 and the second connecting plate 3 are poured at the same time).

[0054] S4. After the concrete reaches the design strength, the soil and rock are backfilled into the backfill trench 13 of the main foundation 11, and the entire foundation structure 1 is buried in the foundation, with only the protruding part 21 of the column 2 exposed.

[0055] S5. After the earthwork backfilling is completed and meets the design requirements, the installation of the bottom tower column 5 of the wind turbine tower can be carried out on the protruding part 21 of the column 2.

[0056] Compared with traditional wind turbine tower foundations, the lattice-type concrete wind turbine tower column foundation of this embodiment significantly reduces the amount of concrete used, optimizes structural efficiency, and effectively reduces project costs.

[0057] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A lattice-type concrete wind turbine tower column foundation, comprising multiple foundation structures (1) evenly distributed circumferentially around the vertical centerline of the wind turbine tower, wherein the foundation structure (1) includes a foundation body (11) embedded in the ground and a platform (2) for connecting to the bottom column (5) of the wind turbine tower, the platform (2) being disposed in the foundation body (11), and multiple first connecting plates (12) being provided between the outer wall of the platform (2) and the inner wall of the foundation body (11), characterized in that, A second connecting plate (3) is provided between the outer walls of adjacent base bodies (11) for connecting adjacent base bodies (11).

2. The lattice-type concrete wind turbine tower column foundation according to claim 1, characterized in that, The second connecting plate (3) is set on the axis connecting line of the adjacent base body (11). The second connecting plate (3) extends outward from the first connecting plate (12) and is on the same straight line as the first connecting plate (12). The height of the second connecting plate (3) is the same as the height of the base body (11).

3. The lattice-type concrete wind turbine tower column foundation according to claim 2, characterized in that, The second connecting plate (3) is I-shaped and includes an upper flange plate, a lower flange plate and a web plate. The web plate is located between the upper flange plate and the lower flange plate, and the thickness b2 of the upper flange plate and the lower flange plate is 0.6-0.8m, and the thickness b1 of the web plate is 0.3-0.5m.

4. The lattice-type concrete wind turbine tower column foundation according to claim 3, characterized in that, The first connecting plate (12) and the cross-sectional shape of the second connecting plate (3) are extended to obtain the second connecting plate (3) and are kept the same.

5. The lattice-type concrete wind turbine tower column foundation according to claim 1, characterized in that, The base body (11) is coaxially arranged with the pedestal (2). Multiple first connecting plates (12) are evenly spaced along the circumference of the pedestal (2). A backfill groove (13) is provided between each first connecting plate (12). The wall thickness of the first connecting plate (12) is 0.2-0.8m. The upper surfaces of the first connecting plate (12) and the base body (11) are flush. The upper surface of the base body (11) is open.

6. The lattice-type concrete wind turbine tower column foundation according to claim 1, characterized in that, The upper end of the column (2) includes a protrusion (21) extending out of the foundation. The diameter of the protrusion (21) is 3.2-3.6m. The outer diameter of the protrusion (21) is larger than that of the bottom column (5) of the wind turbine tower. The protrusion (21) is provided with a doorway (22).

7. The lattice-type concrete wind turbine tower column foundation according to claim 1, characterized in that, The basic body (11) is cylindrical, with an outer diameter of 8-15m, a height of 4-8m, and a side wall thickness of 0.3-0.6m.

8. The lattice-type concrete wind turbine tower column foundation according to any one of claims 1-7, characterized in that, The foundation body (11) has a base plate (14) at the bottom, and multiple piles (4) extending into the foundation are provided below the base plate (14).

9. The lattice-type concrete wind turbine tower column foundation according to claim 8, characterized in that, The pile foundations (4) are evenly arranged along the circumferential edge of the base plate (14), and the pile foundations (4) are located at the intersection of the foundation body (11) and the first connecting plate (12).

10. The lattice-type concrete wind turbine tower column foundation according to claim 8, characterized in that, The pile foundation (4) and the base plate (14) are connected by cast-in-place concrete (44). The hollow structure at the upper end of the pile foundation (4) is provided with a support plate (43) for bearing the cast-in-place concrete (44). The hollow structure at the upper end of the pile foundation (4) is provided with longitudinal steel bars (41) and circumferential stirrups (42) outside the longitudinal steel bars (41). The base plate (14) is provided with base plate steel bars (141). The longitudinal steel bars (41) extend into the base plate (14) and are connected to the base plate steel bars (141). The height H of the longitudinal steel bars (41) extending into the base plate (14) is 1-1.2m. The cast-in-place concrete (44) is cast in the hollow structure at the upper end of the pile foundation (4) and is integrally cast with the base plate (14).

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