Fan foundation and method of construction

Abstract

The application discloses a fan foundation and a construction method. The fan foundation comprises a concrete foundation, a plurality of gravity cylinders, a tower cylinder and a mounting frame. At least part of the concrete foundation can be pre-buried in a foundation pit. The plurality of gravity cylinders are arranged at the outer circumferential side of the concrete foundation along the circumference of the concrete foundation. The tower cylinder is arranged on the concrete foundation. The tower cylinder is arranged on the mounting frame. The mounting frame has a plurality of mounting portions. The plurality of mounting portions are arranged at the outer circumferential side of the tower cylinder along the circumference of the concrete foundation. At least one mounting portion is arranged on each gravity cylinder. The mounting portion is connected with the gravity cylinder. The fan foundation has the advantages of simple structure, low cost and small size.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, and in particular relates to a wind turbine foundation and its construction method. Background Technology

[0002] With the continuous advancement of wind power generation technology, the single-unit capacity of wind turbine generators is getting larger and larger, and the foundation of wind turbine generators is also getting larger and larger, resulting in higher and higher costs.

[0003] In related technologies, wind power foundations are large-volume reinforced concrete structures, requiring large amounts of concrete and steel bars, resulting in low material utilization. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a wind turbine foundation with small foundation volume and low cost.

[0006] The embodiments of the present invention propose a method for constructing wind turbine foundations that is simple to construct, efficient, has controllable installation accuracy, and a smooth process flow.

[0007] According to an embodiment of the present invention, a wind turbine foundation includes: a concrete foundation, at least a portion of which can be pre-embedded in a foundation pit; a plurality of gravity cylinders, which are spaced apart circumferentially on the outer periphery of the concrete foundation; a tower, which is disposed on the concrete foundation; and a mounting frame, on which the tower passes through, the mounting frame having a plurality of mounting portions, which are spaced apart circumferentially on the outer periphery of the tower, each gravity cylinder having at least one mounting portion connected to the gravity cylinder.

[0008] The wind turbine foundation of this invention comprises a concrete foundation, multiple gravity cylinders, a tower, and a mounting frame, which reduces the cost of the wind turbine foundation, fully utilizes the resistance of the gravity cylinders, and allows for adjustment of the weight structure of the gravity cylinders. This effectively reduces the volume of the concrete foundation and tower, decreases the amount of concrete and steel reinforcement used, and saves on the processing and manufacturing costs of the wind turbine foundation.

[0009] In some embodiments, the concrete foundation includes a body and a reinforcing bar mounting frame, the body being cast in concrete, the reinforcing bar mounting frame being disposed on the outer periphery of the body, and at least a portion of the reinforcing bar mounting frame being cast into the body.

[0010] In some embodiments, the concrete foundation includes a first part and a second part connected to each other, the first part being disposed on the second part, and the cross-sectional area of ​​the first part being constant in the vertical direction, the cross-sectional area of ​​the second part decreasing in the direction away from the first part, both the first part and the second part being embedded in the foundation pit, and the upper end face of the second part being located outside the foundation pit.

[0011] In some embodiments, the wind turbine foundation further includes a base plate, which is disposed on the upper surface of the concrete foundation and connected to the concrete foundation, and the tower is disposed on the base plate.

[0012] In some embodiments, the lower end of the tower has a spherical profile, the upper surface of the pad is an arc-shaped surface that mates with the lower end of the tower, and the tower is mounted on the pad.

[0013] In some embodiments, the wind turbine foundation further includes a connector disposed on the lower end surface of the pad, the connector passing through the body and being cross-tied with the steel reinforcement mounting frame.

[0014] In some embodiments, the mounting bracket includes: a plurality of first mounting rods, each extending in an inward or outward direction, one end of each first mounting rod being disposed on the outer circumferential surface of the tower and connected to the tower, the plurality of first mounting rods being spaced apart circumferentially along the tower, and the other end of each first mounting rod forming the mounting portion; and a plurality of second mounting rods, each second mounting rod being disposed one-to-one above the plurality of first mounting rods, one end of each second mounting rod being disposed on the outer circumferential surface of the tower and spaced apart circumferentially along the tower, and the other end of each second mounting rod being connected to the first mounting rod.

[0015] In some embodiments, the mounting portion and the gravity cylinder are spaced apart in the vertical direction, and the fan foundation further includes a flexible connector. One end of the flexible connector is connected to the gravity cylinder, and the other end of the flexible connector is connected to the mounting portion of the mounting rod. The flexible connector has a tension force that pulls the gravity cylinder upward.

[0016] In some embodiments, the gravity cylinder contains a layered and compacted filler.

[0017] The wind turbine foundation construction method according to an embodiment of the present invention includes: S1: excavating a foundation pit according to the design elevation of the foundation pit; S2: installing a steel reinforcement installation frame and a mold in the foundation pit, with the steel reinforcement installation frame placed inside the mold, pouring concrete into the mold, and after the concrete solidifies to form a concrete foundation, removing the mold and filling the foundation pit with filler material; S3: hoisting multiple gravity cylinders around the foundation pit and arranging them at intervals along the circumference of the foundation pit; S4: installing an installation frame on the tower, hoisting the tower onto the concrete foundation, and connecting the installation frame to the gravity cylinders through flexible connectors. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the wind turbine foundation according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the wind turbine foundation without the tower in an embodiment of the present invention.

[0020] Wind turbine foundation 100;

[0021] Concrete foundation 1; Part 11; Part 12;

[0022] Gravity cylinder 2;

[0023] Tower 3;

[0024] Mounting bracket 4; First mounting rod 41; Second mounting rod 42; Mounting part 43;

[0025] 5. Flexible connector; 6. Excavation pit; 7. Ground surface; 8. Pad. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following description of a wind turbine foundation according to an embodiment of the present invention is based on the accompanying drawings.

[0028] like Figure 1-2 As shown, the wind turbine foundation 100 according to an embodiment of the present invention includes a concrete foundation 1, multiple gravity cylinders 2, a tower 3, and a mounting frame 4.

[0029] At least a portion of the concrete foundation 1 can be pre-embedded within the foundation pit 6. Multiple gravity cylinders 2 are spaced apart circumferentially along the outer periphery of the concrete foundation 1. Specifically, as... Figure 1-2As shown, a foundation pit 6 is excavated at the location where the wind turbine foundation 100 is installed, the concrete foundation 1 is installed in the foundation pit 6, and backfill soil is filled into the foundation pit 6, so that the concrete foundation 1 is installed in the foundation pit 6. The gravity cylinder 2 is installed on the ground surface 7 on the outer periphery of the concrete foundation 1 and is evenly spaced along the circumference of the concrete foundation 1.

[0030] The tower 3 is mounted on a concrete foundation 1 and is mounted on a mounting frame 4. The mounting frame 4 has multiple mounting parts 43, which are spaced apart circumferentially along the outer periphery of the tower 3. Each gravity cylinder 2 has at least one mounting part 43, and the mounting part 43 is connected to the gravity cylinder 2. Specifically, as shown... Figure 1 As shown, the tower 3 extends vertically, and a wind turbine generator can be installed on the top of the tower 3. The bottom of the tower 3 is placed on the upper surface of the concrete foundation 1, so that the concrete foundation 1 provides support for the tower 3. The mounting frame 4 is fitted onto the outer circumference of the lower end of the tower 3. The number of multiple mounting parts 43 is equal to the number of multiple gravity cylinders 2. The multiple mounting frames 4 are evenly spaced along the circumference of the concrete foundation 1. Each gravity cylinder 2 is connected to a mounting part 43. The gravity cylinder 2 provides tension to the tower 3, thereby improving the working stability of the tower 3.

[0031] The wind turbine foundation 100 of this embodiment of the invention comprises a concrete foundation 1, multiple gravity cylinders 2, a tower 3, and a mounting frame 4. This allows the concrete foundation 1 to bear only the pressure of the tower 3, while the multiple gravity cylinders 2 bear the tension of the tower 3. Compared with related technologies, the wind turbine foundation 100 of this embodiment of the invention effectively resists the upper load of the tower 3 through the gravity cylinders 2, which can effectively reduce the volume of the concrete foundation 1 and the tower 3, reduce the amount of concrete and steel reinforcement used, and save the processing and manufacturing cost of the wind turbine foundation 100.

[0032] In some embodiments, the concrete foundation 1 includes a body and a reinforcing steel frame (not shown in the figure). The body is cast in concrete, and the reinforcing steel frame is disposed on the outer periphery of the body, with at least a portion of the reinforcing steel frame cast within the body. Specifically, as... Figure 1-2 As shown, the steel reinforcement mounting bracket is embedded in the body, thereby improving the strength and service life of the concrete foundation 1.

[0033] In some embodiments, the concrete foundation 1 includes a first portion 11 and a first portion 12 connected to each other. The first portion 11 is disposed on the first portion 12, and the cross-sectional area of ​​the first portion 11 is constant in the vertical direction, while the cross-sectional area of ​​the first portion 12 decreases in the direction away from the first portion 11. Both the first portion 11 and the first portion 12 are embedded in the foundation pit 6, and the upper end face of the first portion 12 is located outside the foundation pit 6. Specifically, as shown... Figure 1-2As shown, the first part 11 can be cylindrical and the first part 12 can be frustum-shaped. Both the first part 11 and the first part 12 are located in the foundation pit 6 and buried in the foundation pit 6 by backfill soil. The upper end face of the first part 12 extends out of the backfill soil and the tower 3 is located on the first part 12, so that the concrete foundation 1 is pre-embedded in the foundation pit 6, which improves the pull-out resistance of the concrete foundation 1.

[0034] In some embodiments, the wind turbine foundation 100 further includes a base plate 8, which is disposed on the upper end surface of the concrete foundation 1 and connected to the concrete foundation 1, and the tower 3 is disposed on the base plate 8. Specifically, as shown in the figure... Figure 1-2 As shown, the pad 8 is a steel plate and is fixedly installed on the upper surface of the concrete foundation 1. The lower end of the tower 3 is located on the pad 8, thereby improving the strength and hardness of the concrete foundation 1 and increasing the service life of the concrete foundation 1 through the pad 8.

[0035] In some embodiments, the lower end of the tower 3 has a spherical profile, and the upper surface of the pad 8 is an arc-shaped surface that mates with the lower end of the tower 3. The tower 3 is mounted on the pad 8. Specifically, as shown... Figure 1-2 As shown, the tower 3 includes a first section, a transition section, and a second section connected in sequence. The first section is a cylindrical or polygonal prism with a constant cross-sectional shape along the vertical direction. The second section is hemispherical and located below the first section. The transition section has a cross-sectional area that gradually decreases from top to bottom. The transition section is located between the first and second sections and is connected to both the first and second sections. The upper surface of the pad 8 is an arc-shaped surface that mates with the second section. Thus, by installing the tower 3 on the pad, the pad 8 only bears the pressure of the tower 3, ensuring the service life of the pad 8.

[0036] In some embodiments, the wind turbine foundation 100 further includes a connector (shown schematically in the figure), which is disposed on the lower end surface of the base plate 8. The connector passes through the body and is cross-tied with the rebar mounting frame. Specifically, the connector is an anchor rebar and is fixedly installed on the lower end surface of the base plate 8. The connector and the foundation rebar of the rebar mounting frame are cross-tied together and are embedded in the body by concrete pouring, thereby providing an installation foundation for the base plate 8.

[0037] In some embodiments, the mounting bracket 4 includes a plurality of first mounting rods 41 and a plurality of second mounting rods 42.

[0038] Multiple first mounting rods 41 extend in the inward and outward directions. One end of each first mounting rod 41 is located on the outer circumferential surface of the tower 3 and connected to the tower 3. The multiple first mounting rods 41 are spaced apart circumferentially along the tower 3, and the other end of each first mounting rod 41 forms a mounting portion 43. Specifically, as shown... Figure 1-2As shown, the number of multiple first mounting rods 41 is equal to the number of mounting parts 43. The multiple first mounting rods 41 are horizontal rods extending in the inward and outward directions, and one end of the multiple first mounting rods 41 is fixedly installed on the outer peripheral surface of the tower 3 along the circumferential direction. The mounting part 43 is a connecting plate and is provided at the other end of the first mounting rod 41. The mounting part 43 is provided with a through hole extending through the mounting part 43 along its thickness direction.

[0039] Multiple second mounting rods 42 are correspondingly positioned above multiple first mounting rods 41. One end of each second mounting rod 42 is located on the outer circumferential surface of the tower 3 and is spaced apart along the circumference of the tower 3. The other end of each second mounting rod 42 is connected to a first mounting rod 41. Specifically, as shown... Figure 1-2 As shown, the number of multiple second mounting rods 42 is equal to the number of multiple first mounting rods 41. The multiple second mounting rods 42 are inclined rods. The upper ends of the multiple second mounting rods 42 are fixedly installed on the outer peripheral surface of the tower 3 along the circumferential direction. The other ends of the multiple second mounting rods 42 are fixedly installed on the other end of the first mounting rods 41. Thus, the first mounting rods 41, the second mounting rods 42, and the outer peripheral surface of the tower 3 form a stable triangular structure, which enhances the stability of the mounting frame 4 and ensures the installation performance of the mounting frame 4.

[0040] In some embodiments, the mounting portion 43 and the gravity cylinder 2 are spaced apart in the vertical direction. The fan foundation 100 also includes a flexible connector 5, one end of which is connected to the gravity cylinder 2, and the other end of which is connected to the mounting portion 43 of the mounting rod. The flexible connector 5 has a tension force that pulls the gravity cylinder 2 upward. Specifically, as Figure 1-2 As shown, the flexible connector 5 can be a connecting rope or a connecting chain. The flexible connector 5 is inserted into the through hole of the connecting part and connected to the connecting part. The lower end of the flexible connector is connected to the gravity cylinder 2 and the flexible connector 5 has tension. Thus, the gravity cylinder 2 provides tension to the tower cylinder 3 through the flexible connector.

[0041] In some embodiments, the gravity cylinder 2 is filled with layered and compacted filler. Therefore, by compacting the filler inside the gravity cylinder 2, the overall weight of the gravity cylinder 2 can be increased, providing a higher load-bearing capacity.

[0042] The construction method for a 100-meter wind turbine foundation includes:

[0043] S1: Excavate foundation pit 6 according to its design elevation. Specifically, as follows: Figure 1-2 As shown, the excavation of foundation pit 6 (foundation earthwork) is carried out. According to the designed burial depth of concrete foundation 1, the earthwork is excavated to the design elevation. The cross-sectional area of ​​foundation pit 6 gradually increases from bottom to top, and the side of foundation pit 6 is a slope with a certain gradient.

[0044] S2: Install the rebar installation frame and mold inside the foundation pit 6, with the rebar installation frame placed inside the mold. Pour concrete into the mold, and after the concrete solidifies to form the concrete foundation 1, remove the mold and fill the foundation pit 6 with filler material. Specifically, as follows... Figure 1-2 As shown, after the foundation excavation is completed, the foundation reinforcement of the concrete foundation 1 is processed and installed first. Then, the formwork of the concrete foundation 1 is erected. Subsequently, a pad 8 is installed on the top surface of the concrete foundation 1. The pad 8 is generally a steel pad 8. Anchor reinforcement is welded under the pad 8. The anchor reinforcement is cross-tied with the foundation reinforcement of the concrete foundation 1 to form a whole. The pad 8 should be leveled to the design accuracy requirements before the foundation concrete is poured. After the concrete foundation 1 is formed, it is cured. After the concrete foundation 1 is formed, the formwork is removed and the pit 6 is filled with filler material (backfill soil). In this way, the pad 8 is connected to the concrete foundation 1 to form a whole, ensuring the stability of the pad 8.

[0045] S3: Multiple gravity cylinders 2 are hoisted around the foundation pit 6 and spaced apart circumferentially around the foundation pit 6. Specifically, as follows: Figure 1-2 As shown, the positioning is laid out according to the design scheme, and the gravity cylinder 2 is hoisted and positioned so that it is spaced along the circumference of the foundation pit 6 on the ground surface 7 around the pit 6. This ensures that the hanging points of the gravity cylinder 2 are within the design requirements. Therefore, hoisting the gravity cylinder 2 into position first can save crane costs. After the gravity cylinder 2 is hoisted into position, the pre-prepared filling material is filled into the gravity cylinder 2. During the filling process, the filling material is compacted in layers to ensure that the total weight of the filling material meets the design requirements.

[0046] S4: Install the mounting frame 4 on the tower 3, hoist the tower 3 onto the concrete foundation 1, and connect the mounting frame 4 to the gravity cylinder 2 via a flexible connector 5. Specifically, as follows... Figure 1-2 As shown, the mounting bracket 4 is installed on the outer circumference of the tower 3, and the tower 3 is hoisted onto the pad 8 by a crane. The center of the bottom sphere of the tower 3 coincides with the center of the arc surface on the upper surface of the pad 8. At the same time, the hanging point position on the mounting part 43 of the mounting bracket 4 of the tower 38 is consistent with the hanging point position of the gravity cylinder 2. Thus, the layout and positioning work of the gravity cylinder 2 can be carried out in advance to ensure that the hanging point positions of the gravity cylinder 2 and the tower 3 match, resulting in high construction efficiency. After the tower 3 is hoisted into place, the crane hook is kept in place, and then the two ends of the flexible connector 5 are connected to the mounting part 43 and the gravity cylinder 2 respectively, so that the flexible connector 5 is in a tensioned state. Thus, the gravity of the gravity cylinder 2 can be effectively counteracted by the flexible connector 5.

[0047] The wind turbine foundation 100 construction method of this invention has the advantages of simple construction, high efficiency, controllable installation accuracy, and smooth process flow.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A wind turbine foundation, characterized in that, include: A concrete foundation, at least a portion of which may be pre-embedded in the foundation pit; Multiple gravity cylinders are arranged at intervals along the circumference of the concrete foundation on the outer periphery of the concrete foundation. A tower, which is mounted on the concrete foundation; Mounting frame, the tower cylinder is mounted on the mounting frame, the mounting frame has multiple mounting parts, the multiple mounting parts are spaced apart along the circumference of the concrete foundation on the outer periphery of the tower cylinder, each gravity cylinder has at least one mounting part, the mounting part is connected to the gravity cylinder; The mounting part and the gravity cylinder are spaced apart in the vertical direction. The fan foundation also includes a flexible connector. One end of the flexible connector is connected to the gravity cylinder, and the other end of the flexible connector is connected to the mounting part of the mounting frame. The flexible connector has a tension force that pulls the gravity cylinder upward.

2. The wind turbine foundation according to claim 1, characterized in that, The concrete foundation includes a body and a steel reinforcement mounting frame. The body is made of concrete, and the steel reinforcement mounting frame is located on the outer periphery of the body, with at least a portion of the steel reinforcement mounting frame cast into the body.

3. The wind turbine foundation according to claim 1, characterized in that, The concrete foundation includes a first part and a second part connected to each other. The first part is disposed on the second part, and the cross-sectional area of ​​the first part is constant in the vertical direction, while the cross-sectional area of ​​the second part decreases in the direction away from the first part. Both the first part and the second part are embedded in the foundation pit, and the upper end face of the second part is located outside the foundation pit.

4. The wind turbine foundation according to claim 2, characterized in that, It also includes a base plate, which is disposed on the upper surface of the concrete foundation and connected to the concrete foundation, and the tower is disposed on the base plate.

5. The wind turbine foundation according to claim 4, characterized in that, The lower end of the tower has a spherical profile, and the upper surface of the pad is an arc-shaped surface that matches the lower end of the tower. The tower is mounted on the pad.

6. The wind turbine foundation according to claim 4, characterized in that, It also includes a connector, which is disposed on the lower end surface of the pad, and the connector passes through the body and is cross-tied with the steel bar mounting frame.

7. The wind turbine foundation according to claim 4, characterized in that, The mounting bracket includes: Multiple first mounting rods extend in the inward and outward directions. One end of each first mounting rod is located on the outer circumferential surface of the tower and connected to the tower. The multiple first mounting rods are spaced apart along the circumference of the tower. The other end of each first mounting rod forms the mounting portion. Multiple second mounting rods are provided above multiple first mounting rods in a one-to-one correspondence. One end of each of the multiple second mounting rods is provided on the outer circumferential surface of the tower and is spaced apart along the circumference of the tower. The other end of each of the multiple second mounting rods is connected to the first mounting rod.

8. The wind turbine foundation according to any one of claims 1-7, characterized in that, The gravity cylinder contains layered and compacted filler material.

9. A method for constructing a wind turbine foundation, characterized in that, include: S1: Excavate the foundation pit according to the design elevation of the foundation pit; S2: Install the rebar installation frame and mold in the foundation pit, with the rebar installation frame placed inside the mold. Pour concrete into the mold and wait for the concrete to solidify to form a concrete foundation. Remove the mold and fill the foundation pit with filler material. S3: Multiple gravity cylinders are suspended around the foundation pit and spaced apart along the circumference of the foundation pit; S4: Install a mounting frame on the tower, hoist the tower onto the concrete foundation, and connect the mounting frame to the gravity cylinder via a flexible connector.

Images