Annular foundation structure of mixed tower fan for bedrock area

Abstract

The utility model relates to the technical field of fan foundations, and provides a mixed tower fan annular foundation structure for a bedrock area, which is used for being built on a bedrock foundation which is not influenced by underground water, a platform column is annular, a first through hole, a second through hole and a groove are formed in the middle of the platform column, the first through hole is communicated with the second through hole to form a communication hole, and the communication hole penetrates through the platform column. The second through opening is formed in the base and extends to the bedrock foundation, the second through opening is located below the first through opening so that the bedrock foundation can be exposed, the fan foundation is simplified to be in a circular ring shape, and the multiple grooves are formed in the first through opening. Through the technical scheme, the separation area of the fan foundation is reduced, the concrete work amount of the fan foundation is optimized, the construction progress is accelerated, and the construction period is shortened.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine foundation technology, specifically to a ring foundation structure for hybrid tower wind turbines in bedrock areas. Background Technology

[0002] Traditional hybrid-tower wind turbine foundation designs typically include a prestressed tensioning chamber in the concrete tower body, located in the center of the foundation. This hollow chamber facilitates access for personnel and equipment to tension the prestressed anchor cables. The chamber usually has a reinforced concrete base slab integrated with the wind turbine foundation. This base slab serves two purposes: it distributes the foundation's base pressure and it seals the tensioning chamber, preventing groundwater intrusion that could affect the prestressed anchor cable tensioning and structural safety. As the capacity of individual wind turbine units increases, the amount of concrete work required for a single wind turbine foundation also grows significantly. Especially in bedrock areas with good geology and unaffected by groundwater, optimizing the amount of concrete work required for the wind turbine foundation is crucial for saving project investment and construction time. Utility Model Content

[0003] This invention proposes a ring foundation structure for hybrid tower wind turbines in bedrock areas, which makes full use of the bearing capacity of the foundation, reduces the detachment area of ​​the wind turbine foundation, optimizes the amount of wind turbine foundation work, and thus speeds up the construction progress and shortens the construction period.

[0004] The technical solution of this utility model is as follows: A ring foundation structure for a hybrid tower wind turbine in bedrock areas includes a bedrock foundation, a column set on the bedrock foundation, an installation opening in the center of the column, and a groove forming a small chamber around the inner wall of the installation opening. The installation opening is a through opening that penetrates the bottom surface of the column, making the column annular. The opening below the groove is a second through opening, and the opening above and below the groove is a first through opening. The area of ​​the second through opening is less than or equal to the area of ​​the first through opening.

[0005] The first opening is arranged in a ring shape, and there are multiple grooves. At the lower part of the first opening, the multiple grooves are arranged at intervals along the circumference of the first opening. The diameter of the second opening is less than or equal to the diameter of the first opening.

[0006] The column has a tensioning chamber bracket, which is located above the groove. A sleeve is installed inside the tensioning chamber bracket. The sleeve has an anchor plate and a tube. The tube is pre-embedded at an incline. The anchor plate is located on one side of the tube and is set at the lower part of the tensioning chamber bracket, and is located in the groove.

[0007] The tube slopes upwards towards the middle of the column.

[0008] It also includes anchor cables, which are installed inside the tube and run in the same direction as the inclination of the casing. One end extends through the anchor plate into the groove, and the other end extends to the outside of the tensioning chamber bracket.

[0009] The plurality of grooves are evenly distributed along the circumference of the first opening, and the width of the inner wall of the first opening between two adjacent grooves is the same as the width of the groove.

[0010] It also includes a foundation extension base plate, which is arranged in a ring and set around the perimeter of the column, and has an inclined surface.

[0011] The upper part of the base extension plate is lower than the upper part of the column.

[0012] The working principle and beneficial effects of this utility model are as follows:

[0013] In this invention, the pre-reserved groove provides space for the anchor cable (i.e., prestressed steel strand) to be pulled, improving the flexibility and convenience of construction. The second opening exposes the bedrock foundation, thus forming a hollow structure at the bottom. The wind turbine foundation is a circular gravity-type extended foundation. Under eccentric loads, the column base must not detach under normal operating conditions, and under extreme conditions, the detachment area of ​​the foundation bottom surface (the extended base plate and the bottom surface of the column) should not exceed 25%. Based on the control of the detachment area, a second opening can be set at the bottom of the column, and the bedrock foundation is exposed through the second opening, forming a hollow center. The hollow center can optimize the concrete volume by about 5%. Based on the hollow structure, the foundation can be simplified to a circular ring foundation, which reduces the bottom area of ​​the column. In bedrock areas, the bearing capacity of the foundation can be effectively utilized, the base reaction force increases, and the detachment area of ​​the wind turbine foundation base is reduced, effectively controlling the detachment area of ​​the base, improving the overall stability of the foundation, further reducing the size of the wind turbine foundation, optimizing the amount of wind turbine foundation engineering, thereby accelerating the construction progress and shortening the construction period. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model (the diameter of the second opening is the same as the diameter of the first opening);

[0016] Figure 3 This is a schematic diagram of another embodiment of the present invention (the diameter of the second opening is smaller than the diameter of the first opening);

[0017] In the diagram: 1. Bedrock foundation; 2. Column; 201. First opening; 202. Second opening; 203. Groove; 205. Support column; 206. Tensioning chamber corbel; 3. Sleeve; 301. Anchor plate; 302. Pipe section; 4. Anchor cable; 5. Foundation extension plate; 501. Inclined surface; 6. Concrete cushion layer; 7. Concrete tower. Detailed Implementation

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0019] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Reference Figures 1-3 A ring-shaped foundation structure for hybrid tower wind turbines in bedrock areas is proposed. The structure is constructed on a bedrock foundation 1. The column 2 is circular and has a first opening 201, a second opening 202, and a groove 203 in its middle. The first opening 201 and the second opening 202 are connected to form a through opening. The through opening passes through the column 2 and extends to the bedrock foundation 1. The second opening 202 is located below the first opening 201, so that the bedrock foundation 1 is exposed. There are multiple grooves 203, and multiple grooves 203 are arranged in the first opening 201.

[0023] In this embodiment, the concrete cushion layer 6 is constructed first to facilitate foundation formwork construction and simultaneously maintain the flatness of the bottom surface of the tensioning chamber. The groove 203 is reserved to provide space for the anchor cable 4 (i.e., prestressed steel strand) to be pulled, improving the flexibility and convenience of construction. The second opening 202 exposes the bedrock foundation 1, thus forming a hollow structure at the bottom. The wind turbine foundation is a circular gravity-type extended foundation. Under eccentric load, the base of the column 2 is required not to detach under normal working conditions. Under extreme working conditions, the detachment area of ​​the foundation bottom surface (the extended base plate and the bottom surface of the column 2) should not exceed 25%. Based on the control of the detachment area, a second opening 202 can be set at the bottom of the column 2, and the bedrock foundation 1 can be exposed through the second opening 202, thus forming a hollow middle section. The amount of concrete in the hollow middle section can be optimized by about 5%. Based on the hollow structure, the foundation can be simplified to a circular ring foundation. The setting of the second opening 202 can reduce the bottom area of ​​the column 2, which can effectively utilize the bearing capacity of the foundation in bedrock areas, increase the base reaction force, reduce the detachment area of ​​the wind turbine foundation base, effectively control the detachment area of ​​the base, improve the overall stability of the foundation, further reduce the size of the wind turbine foundation, optimize the amount of wind turbine foundation engineering, and thus speed up the construction progress and shorten the construction period.

[0024] Furthermore, the first opening 201 is arranged in a ring shape, and multiple grooves 203 are arranged at intervals along the circumference of the first opening 201 at the lower part of the first opening 201.

[0025] In this embodiment, this design makes the foundation more evenly stressed. The grooves 203 are arranged at intervals along the circumference, which facilitates the installation and tensioning of anchor cables and improves the flexibility and convenience of construction. Furthermore, the diameter of the second opening 202 is less than or equal to the diameter of the first opening 201.

[0026] In this embodiment, the size of the second opening 202 is controlled within a certain range, reducing the effective area at the bottom of the foundation but increasing the base reaction force. This helps to better utilize the bearing capacity of the bedrock and improve the foundation's bearing capacity. Under extreme conditions, the phenomenon of the foundation edge detaching from the foundation soil is alleviated. The size of the second opening 202 is less than or equal to the diameter of the first opening 201, forming a hollow structure in the middle, reducing unnecessary concrete usage. The hollow middle section can optimize the concrete volume by about 5%. The size and position of the second opening 202 can be adjusted according to the specific project requirements to meet different wind turbine models and load requirements. This design has strong adaptability and is suitable for various geological conditions and different engineering needs. In summary, the design of the second opening 202 being less than or equal to the diameter of the first opening 201 not only improves the stability and bearing capacity of the foundation but also reduces material usage, simplifies the construction process, and facilitates maintenance and inspection. This design is an efficient, economical, and reliable foundation design scheme, particularly suitable for the construction of mixed-tower wind turbine foundations in bedrock areas unaffected by groundwater.

[0027] Furthermore, the column has a tension chamber bracket 206, which is located above the groove 203, and also includes:

[0028] The sleeve 3 has an anchor plate 301 and a tube section 302. The tube section 302 is inclinedly disposed within the tension chamber bracket 206. The anchor plate 301 is located on one side of the tube section 302, positioned at the lower part of the tension chamber bracket 206, and located within a groove 203. The tube section 302 is inclined from bottom to top towards the middle of the support column 2. Anchor cables 4 are disposed within the tube section 302, and their direction is the same as the inclination direction of the sleeve 3. One end extends through the anchor plate 301 into the groove 203, and the other end extends to the outside of the tension chamber bracket 206.

[0029] In this embodiment, the sleeves 3 are evenly distributed within the corbel 206 according to the number of anchor cables 4. The anchor cables 4 are inclined through the sleeves 3, with an inclination angle of up to 1.12°, which can be adjusted according to the actual project. This allows the prestress to be evenly distributed throughout the foundation, reducing local stress concentration and improving the overall structural stability. The tensioning effect of the anchor cables 4 strengthens the connection between the foundation and the bedrock, further improving the overall stability of the foundation. The inclined arrangement of the anchor cables 4, based on the inclination angle of the concrete tower, allows the prestress to be more evenly transmitted to all parts of the foundation, avoiding structural deformation or damage caused by uneven prestress distribution. The anchor cables 4 can extend from the concrete tower 7 through the foundation sleeves 3 into the groove 203 for tensioning within the groove 203, connecting the concrete tower 7 and the wind turbine foundation. This simple operation improves the flexibility and convenience of construction.

[0030] Furthermore, there is a support column 205 between adjacent grooves 203, and the width of the support column 205 is the same as the width of the groove 203.

[0031] In this embodiment, the support column can be omitted if the stiffness of the platform 2 is sufficient. The width of the support column is the same as the width of the groove 203. The support column can improve the overall stiffness of the platform 2, distribute the load of the tensioning chamber bracket 206, reduce local stress concentration, and thus improve the stability of the overall structure. Preferably, the groove 203 has a depth of about 0.8 to 1.1 m, a height of about 1.1 to 1.5 m, a width of not less than 1 m, and about 12 to 20 prestressing cables, determined according to the manufacturer's requirements for prestressing cable tensioning.

[0032] Furthermore, it also includes: a foundation extension base plate 5, which is arranged in a ring and set on the bedrock foundation 1 around the pedestal 2, and has an inclined surface 501. The upper part of the foundation extension base plate 5 is lower than the upper part of the pedestal 2.

[0033] In this embodiment, the annular arrangement of the foundation extension plate 5 and the design of the inclined surface 501 enable the upper load to be more evenly distributed on the bedrock foundation 1, thereby improving the stability of the entire foundation.

[0034] In summary, for areas with good geological conditions, the foundation of a hybrid tower wind turbine generally adopts a gravity-type extended foundation on the natural ground. This eliminates the need for a small chamber floor slab, forming a ring foundation, making full use of the bearing capacity of the bedrock, reducing the detachment area of ​​the wind turbine foundation, optimizing the amount of wind turbine foundation work, thereby accelerating the construction progress and shortening the construction period.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A ring-shaped foundation structure for a hybrid tower wind turbine in bedrock areas, comprising a bedrock foundation (1), a column (2) set on the bedrock foundation (1), the column (2) having an installation opening at its center, and a groove (203) forming a chamber around the inner wall of the installation opening, characterized in that, The mounting opening is a through-hole that penetrates the bottom surface of the column (2), making the column (2) into a ring shape. The second opening (202) is located below the groove (203), and the groove (203) and the area above the groove (203) are the first opening (201). The area of ​​the second opening (202) is less than or equal to the area of ​​the first opening (201).

2. The annular foundation structure for hybrid tower wind turbines in bedrock areas according to claim 1, characterized in that, The first opening (201) is arranged in a ring, and there are multiple grooves (203). At the lower part of the first opening (201), multiple grooves (203) are arranged at intervals along the circumference of the first opening (201). The diameter of the second opening (202) is less than or equal to the diameter of the first opening (201).

3. The annular foundation structure for hybrid tower wind turbines in bedrock areas according to claim 1, characterized in that, The column (2) has a tension chamber bracket (206) located above the groove (203). A sleeve (3) is installed inside the tension chamber bracket (206). The sleeve (3) has an anchor plate (301) and a tube (302). The tube (302) is pre-embedded at an inclination. The anchor plate (301) is located on one side of the tube (302), set at the lower part of the tension chamber bracket (206), and located inside the groove (203).

4. The annular foundation structure for hybrid tower wind turbines in bedrock areas according to claim 3, characterized in that, The tube (302) slopes upwards toward the middle of the column (2).

5. The annular foundation structure for hybrid tower wind turbines in bedrock areas according to claim 3, characterized in that, It also includes an anchor cable (4), which is set inside the tube (302) and runs in the same direction as the inclination of the sleeve (3). One end extends through the anchor plate (301) into the groove (203), and the other end extends to the outside of the tensioning chamber bracket (206).

6. The annular foundation structure for hybrid tower wind turbines in bedrock areas according to claim 2, characterized in that, The plurality of grooves (203) are evenly distributed around the circumference of the first opening (201), and the width of the inner wall of the first opening (201) between two adjacent grooves (203) is the same as the width of the groove (203).

7. The annular foundation structure for hybrid tower wind turbines in bedrock areas according to claim 1, characterized in that, It also includes a foundation extension base plate (5), which is arranged in a ring and is set around the pedestal (2) with an inclined surface (501).

8. The annular foundation structure for hybrid tower wind turbines in bedrock areas according to claim 7, characterized in that, The upper part of the base extension plate (5) is lower than the upper part of the column (2).

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