Concrete transition section and production process therefor, and wind turbine generator

Abstract

A concrete transition section, comprising: a concrete cylinder (1), an upper anchor plate (2), a lower anchor plate (4) and anchor bolts (5). The upper anchor plate (2) is arranged on the top surface of the concrete cylinder (1); the lower anchor plate (4) is arranged on a variable cross section of the concrete cylinder (1); a plurality of upper anchor holes of the upper anchor plate (2), a plurality of main anchor holes of the concrete cylinder (1) and a plurality of lower anchor holes of the lower anchor plate (4) are communicated on a one-to-one basis, so as to allow the corresponding anchor bolts (5) to pass through; and the lower ends of the anchor bolts (5) are connected to the lower anchor plate (4), and the upper ends of the anchor bolts (5) are configured to be connected to a wind turbine nacelle (3). The concrete transition section can ensure the stability of the wind turbine nacelle. In addition, the cooperation of the concrete cylinder and the anchor bolts can ensure that the concrete transition section has certain compression resistance to bear the wind turbine nacelle, and have high safety performance. In addition, also involved are a production process for a concrete transition section and a wind turbine generator.

Description

Concrete transition section and its production process, wind turbine generator set Technical Field

[0001] This invention relates to the field of wind power, specifically to a concrete transition section and its production process, and a wind turbine generator set. Background Technology

[0002] Wind turbine generator sets consist of a tower, nacelle, and blades connected in sequence. In related technologies, hybrid towers include a concrete tower section, a steel transition section, and a steel tower section arranged in sequence. The nacelle is mounted on the steel transition section, and the cooperation between the steel transition section and the steel tower section ensures the flatness of the nacelle installation. However, the steel transition section and the steel tower section increase the structural complexity of the tower. Furthermore, the abrupt change in stiffness in the steel-concrete transition zone poses certain safety hazards to the tower and necessitates a larger concrete tower section. Summary of the Invention

[0003] This invention aims to at least partially address one of the technical problems in related technologies. To this end, embodiments of this invention propose a concrete transition section for supporting the installation of a wind turbine nacelle, thereby reducing the structural complexity and safety risks of the tower.

[0004] Embodiments of the present invention also propose two production processes for concrete transition sections.

[0005] An embodiment of the present invention also proposes a wind turbine generator set.

[0006] The concrete transition section in this embodiment of the invention includes:

[0007] A concrete cylinder with a variable cross-section on its inner circumferential surface, and a plurality of main anchor holes arranged at intervals along the circumference of the concrete cylinder, the main anchor holes extending from the variable cross-section to the top surface of the concrete cylinder;

[0008] The upper anchor plate is provided on the top surface of the concrete cylinder. The upper anchor plate has multiple upper anchor holes that correspond one-to-one with the multiple main anchor holes. The upper anchor plate is used to support the wind turbine nacelle.

[0009] The lower anchor plate is provided on the variable cross section of the concrete cylinder, and the lower anchor plate is provided with a plurality of lower anchor holes that correspond one-to-one with the plurality of main anchor holes;

[0010] Anchor bolts, a plurality of anchor bolts are used to pass through a plurality of corresponding and connected upper anchor holes, main anchor holes and lower anchor holes in a one-to-one manner. The lower end of the anchor bolt is connected to the lower anchor plate and the upper end of the anchor bolt is used to connect to the wind turbine nacelle.

[0011] In this embodiment of the invention, the concrete transition section has an upper anchor plate installed in the concrete cylinder to support the wind turbine nacelle, ensuring the flatness of the wind turbine nacelle. Multiple anchor bolts are installed on the upper anchor plate, the concrete cylinder, and the lower anchor plate. The lower end of the anchor bolt is connected to the lower anchor plate, and the upper end of the anchor bolt is connected to the wind turbine nacelle, ensuring the stability of the wind turbine nacelle. At the same time, the concrete cylinder in conjunction with the anchor bolts ensures that the concrete transition section has a certain compressive strength to support the wind turbine nacelle and has high safety performance.

[0012] In addition, the concrete transition section is used in conjunction with the concrete tower section to support the wind turbine nacelle, avoiding the safety hazards caused by the steel-concrete transition zone, better controlling the overall displacement of the tower, reducing the size of the concrete tower section to lower the structural complexity and cost of the tower, and improving the supply chain delivery efficiency of the tower.

[0013] In some embodiments, the upper anchor plate is used to support the nacelle connection device of the wind turbine nacelle, and the top end of the anchor bolt is used to connect to the nacelle connection device of the wind turbine nacelle.

[0014] In some embodiments, the upper anchor plate is an annular ring extending circumferentially along the concrete cylinder, the lower anchor plate is an annular ring extending circumferentially along the concrete cylinder, the thickness of the upper anchor plate is greater than the thickness of the lower anchor plate, and the width of the upper anchor plate is greater than the width of the lower anchor plate.

[0015] In some embodiments, the anchor bolt includes an anchor rod and a nut. The anchor rod passes through the corresponding upper anchor hole, the main anchor hole, and the lower anchor hole. The lower end of the anchor rod is provided with the nut, which abuts against the lower anchor plate. The upper end of the anchor rod is provided with a thread for connecting the wind turbine nacelle.

[0016] In some embodiments, the concrete cylinder is cast from ultra-high performance concrete.

[0017] In some embodiments, the upper anchor plate is cast and fixed to the top surface of the concrete cylinder, and the lower anchor plate is cast and fixed to the variable cross-section of the concrete cylinder.

[0018] In some embodiments, the concrete cylinder is provided with a plurality of connecting anchor holes arranged at intervals along the circumference of the concrete cylinder, the connecting anchor holes penetrating the cylinder wall along the axial direction of the concrete cylinder, and the connecting anchor holes are used to install prestressed anchors.

[0019] In some embodiments, the concrete cylinder includes an outer cylinder section and an inner cylinder section. The inner cylinder section surrounds the inner circumference of the outer cylinder section. The top surface of the inner cylinder section is higher than the top surface of the outer cylinder section and forms the top surface of the concrete cylinder. The bottom surface of the inner cylinder section is higher than the bottom surface of the outer cylinder section and forms the variable cross-section of the concrete cylinder. The connecting anchor hole is provided in the outer cylinder section and penetrates the outer cylinder section along the axial direction of the concrete cylinder.

[0020] In some embodiments, the inner circumferential surface of the outer cylinder section has an inclined surface, the inclined surface connecting the bottom surface of the outer cylinder section and the variable cross-section, the inclined surface extending in a bottom-to-top direction and inclined toward the centerline of the concrete cylinder.

[0021] In some embodiments, a first sleeve is provided inside the inner cylinder section wall, the first sleeve penetrates the inner cylinder section wall along the axial direction of the inner cylinder section, and the cavity of the first sleeve forms the main anchor hole.

[0022] In some embodiments, a second sleeve is provided inside the outer cylinder section wall, which is cast and fixed. The second sleeve penetrates the outer cylinder section wall along the axial direction of the outer cylinder section, and the cavity of the second sleeve forms the connecting anchor hole.

[0023] In some embodiments, the concrete cylinder includes a main body, a grouting layer, and a leveling assembly. The grouting layer is disposed on the top of the main body, the upper anchor plate is disposed on the top surface of the grouting layer, and the leveling assembly is disposed within the grouting layer and connected between the upper anchor plate and the main body. A plurality of the leveling assemblies are arranged at intervals along the circumference of the concrete cylinder.

[0024] In some embodiments, the leveling assembly includes a base nut, an adjusting nut, and a screw rod, the screw rod extending axially along the concrete cylinder, the base nut being disposed on the screw rod and abutting against the top surface of the main body, the adjusting nut being disposed on the top of the screw rod and abutting against the bottom surface of the upper anchor plate, and at least the adjusting nut being movable relative to the screw rod along the axial direction of the screw rod.

[0025] A production process for the concrete transition section according to an embodiment of the present invention includes:

[0026] The upper anchor plate is placed in the inverted casting mold and abuts against the bottom surface of the inverted casting mold, the bottom surface of the inverted casting mold having a certain degree of flatness;

[0027] Concrete is poured into the inverted casting mold to form the concrete cylinder, and the lower anchor plate is placed during or before the pouring process.

[0028] The production process of the concrete transition section in this embodiment of the invention involves casting the concrete transition section in an inverted manner using an inverted casting mold. By abutting the bottom surface of the inverted casting mold against the upper anchor plate, the flatness of the upper anchor plate is ensured, thereby ensuring the flatness of the concrete transition section for installing the wind turbine nacelle.

[0029] Another production process for the concrete transition section according to an embodiment of the present invention includes:

[0030] Place the lower anchor plate in the upright casting mold;

[0031] Concrete is poured into the upright casting mold to form the main body;

[0032] Multiple leveling components are provided on the top surface of the main body, and leveling is performed.

[0033] The upper anchor plate is placed on the plurality of leveling components;

[0034] A grouting template is provided between the top surface of the main body and the upper anchor plate;

[0035] Grouting material is poured into the grouting template to form the grouting layer.

[0036] The production process of the concrete transition section in this embodiment of the invention involves sequentially pouring the main body of the concrete cylinder and the grouting layer. Before pouring the grouting layer, multiple leveling components located on the main body are adjusted to ensure that the upper anchor plate has a certain degree of flatness. Then, the grouting layer is poured to maintain a certain degree of flatness of the upper anchor plate, thereby ensuring the flatness of the wind turbine nacelle installed in the concrete transition section.

[0037] The wind turbine generator set of this embodiment of the invention includes:

[0038] Concrete tower sections, multiple concrete tower sections are arranged sequentially along the vertical direction;

[0039] A concrete transition section, wherein the concrete transition section is any of the concrete transition sections described above, and the concrete transition section is provided on the concrete tower section located at the top;

[0040] The prestressed anchor extends vertically and is sequentially inserted into the wall of the concrete cylinder and the wall of a plurality of concrete tower sections; or, the prestressed anchor is sequentially inserted into the wall of the concrete cylinder and the inner cavity of a plurality of concrete tower sections, and the plurality of prestressed anchors are arranged at circumferential intervals along the concrete tower section and the concrete transition section.

[0041] Wind turbine nacelle, which is connected to the concrete transition section.

[0042] The wind turbine generator set of this invention uses a concrete tower section and a concrete transition section to jointly support the wind turbine nacelle, and uses tensioned prestressed anchors to meet the prestress requirements, thereby ensuring that the concrete tower section and the concrete transition section have certain compressive strength, and ensuring the flatness and stability of the wind turbine nacelle installation, so as to be able to support the wind turbine nacelle and have high safety performance. At the same time, the size of the concrete tower section can be reduced to reduce the structural complexity and cost of the tower. In addition, the wind turbine generator set can also achieve high supply chain delivery efficiency. Attached Figure Description

[0043] Figure 1 is a front sectional view of a first embodiment of the concrete transition section of the present invention;

[0044] Figure 2 is a top view of the concrete transition section according to an embodiment of the present invention;

[0045] Figure 3 is a front sectional view of a second embodiment of the concrete transition section of the present invention;

[0046] Figure 4 is a schematic diagram of the leveling component in an embodiment of the present invention;

[0047] Figure 5 is a front sectional view of a first embodiment of the wind turbine generator set according to the present invention;

[0048] Figure 6 is a front sectional view of a second embodiment of the wind turbine generator set according to the present invention.

[0049] Figure label:

[0050] 1. Concrete cylinder; 11. Variable cross section; 12. Outer cylinder section; 121. Inclined surface; 13. Inner cylinder section; 14. First sleeve; 15. Second sleeve; 16. Main body; 17. Grouting layer; 18. Leveling component; 181. Base nut; 182. Adjusting nut; 183. Screw; 2. Upper anchor plate; 3. Wind turbine nacelle; 31. Nacelle connection device; 4. Lower anchor plate; 5. Anchor bolt; 51. Anchor rod; 52. Bolt; 6. Prestressed anchor; 7. Concrete tower section. Detailed Implementation

[0051] 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.

[0052] The following description, with reference to Figures 1-6, describes a concrete transition section and its production process, as well as a wind turbine generator set, according to embodiments of the present invention.

[0053] As shown in Figures 1-6, the concrete transition section of this embodiment of the invention includes a concrete cylinder 1, an upper anchor plate 2, a lower anchor plate 4, and anchor bolts 5.

[0054] The inner circumferential surface of the concrete cylinder 1 has a variable cross-section 11. The concrete cylinder 1 is provided with multiple main anchor holes spaced apart along its circumference, extending from the variable cross-section 11 to the top surface of the concrete cylinder 1. An upper anchor plate 2 is located on the top surface of the concrete cylinder 1, and has multiple upper anchor holes that correspond one-to-one with the multiple main anchor holes. The upper anchor plate 2 is used to support the wind turbine nacelle 3. A lower anchor plate 4 is located on the variable cross-section 11 of the concrete cylinder 1, and has multiple lower anchor holes that correspond one-to-one with the multiple main anchor holes. Multiple anchor bolts 5 are used to pass through the multiple corresponding and connected upper anchor holes, main anchor holes, and lower anchor holes. The lower end of the anchor bolt 5 connects to the lower anchor plate 4, and the upper end of the anchor bolt 5 connects to the wind turbine nacelle 3.

[0055] Specifically, as shown in Figures 1-6, the concrete cylinder 1 is preferably a cylindrical shape in the vertical direction. The inner circumferential surface of the concrete cylinder 1 has a variable cross section 11, and the variable cross section 11 is provided with a lower anchor plate 4. The top surface of the concrete cylinder 1 is provided with an upper anchor plate 2. The lower anchor plate 4 and the upper anchor plate 2 are arranged at intervals in the vertical direction. The upper anchor plate 2 is used to support the wind turbine nacelle 3.

[0056] The upper anchor plate 2 is provided with multiple upper anchor holes arranged at intervals along its circumference, and the upper anchor holes penetrate the upper anchor plate 2 vertically. The concrete cylinder 1 is provided with multiple main anchor holes arranged at intervals along its circumference, and the main anchor holes extend from the variable cross section 11 to the top surface of the concrete cylinder 1. The lower anchor plate 4 is provided with multiple lower anchor holes arranged at intervals along its circumference, and the lower anchor holes penetrate the lower anchor plate 4 vertically. The multiple upper anchor holes, multiple main anchor holes and multiple lower anchor holes are connected one-to-one, and each set of connected upper anchor holes, main anchor holes and lower anchor holes is provided with a corresponding anchor bolt 5. The lower end of the anchor bolt 5 is connected to the lower anchor plate 4. Preferably, the lower end of the anchor bolt 5 is anchored to the lower anchor plate 4, and the upper end of the anchor bolt 5 extends above the upper anchor plate 2 and is used to connect the wind turbine nacelle 3.

[0057] In this embodiment of the invention, the concrete transition section has an upper anchor plate installed in the concrete cylinder to support the wind turbine nacelle, ensuring the flatness of the wind turbine nacelle. Multiple anchor bolts are installed on the upper anchor plate, the concrete cylinder, and the lower anchor plate. The lower end of the anchor bolt is connected to the lower anchor plate, and the upper end of the anchor bolt is connected to the wind turbine nacelle, ensuring the stability of the wind turbine nacelle. At the same time, the concrete cylinder in conjunction with the anchor bolts ensures that the concrete transition section has a certain compressive strength to support the wind turbine nacelle and has high safety performance.

[0058] In addition, the concrete transition section is used in conjunction with the concrete tower section to support the wind turbine nacelle, avoiding the safety hazards caused by the steel-concrete transition zone, better controlling the overall displacement of the tower, reducing the size of the concrete tower section to lower the structural complexity and cost of the tower, and improving the supply chain delivery efficiency of the tower.

[0059] As shown in Figure 5, the wind turbine nacelle 3 includes a nacelle body and a nacelle connection device 31. The nacelle connection device 31 is located at the bottom of the nacelle body and within the nacelle body. The upper anchor plate 2 is preferably used to support the nacelle connection device 31 of the wind turbine nacelle 3 to ensure the flatness of the nacelle connection device 31. The top of the anchor bolt 5 is preferably used to connect to the nacelle connection device 31 of the wind turbine nacelle 3 to ensure the stability of the nacelle connection device 31. The nacelle connection device 31 is preferably a nacelle yaw bearing.

[0060] Preferably, the concrete cylinder 1 is cast from ultra-high performance concrete. The strength and fatigue resistance of the ultra-high performance concrete, combined with the anchor bolts 5, give the concrete cylinder 1 strong compressive strength, thereby ensuring that it can support the wind turbine nacelle 3 and reducing the size of the concrete cylinder 1.

[0061] As shown in Figures 1-3, the upper anchor plate 2 is an annular ring extending circumferentially along the concrete cylinder 1, preferably a circular ring. The lower anchor plate 4 is an annular ring extending circumferentially along the concrete cylinder 1, preferably a circular ring. The thickness of the upper anchor plate 2 in the vertical direction is greater than the thickness of the lower anchor plate 4 in the vertical direction, and the annular width of the upper anchor plate 2 is greater than the annular width of the lower anchor plate 4. This ensures the stability and flatness of the engine room connection device 31.

[0062] The upper anchor plate 2 is cast and fixed to the top surface of the concrete cylinder 1, preferably fixed to the top surface of the concrete cylinder 1. The lower anchor plate 4 is cast and fixed to the variable cross-section 11 of the concrete cylinder 1, preferably fixed within the variable cross-section 11; in other words, the lower anchor plate 4 is embedded within the variable cross-section 11. This ensures that both the upper anchor plate 2 and the lower anchor plate 4 are firmly connected to the concrete cylinder 1.

[0063] As shown in Figures 1 and 3, the anchor bolt 5 includes an anchor rod 51 and a nut 52. The anchor rod 51 passes through the corresponding upper anchor hole, main anchor hole and lower anchor hole. The lower end of the anchor rod 51 is provided with a nut 52, which abuts against the lower anchor plate 4. The upper end of the anchor rod 51 is provided with a thread, which is used to connect the wind turbine nacelle 3.

[0064] Specifically, the anchor rod 51 extends vertically and is provided with external threads. Preferably, the external threads are located at the upper and lower ends of the anchor rod 51. Each set of connected upper anchor holes, main anchor holes, and lower anchor holes contains a corresponding anchor rod 51. The lower end of the anchor rod 51 extends below the lower anchor plate 4 and is threadedly connected to a nut 52. The upper end face of the nut 52 abuts against the lower end face of the lower anchor plate 4. The upper end of the anchor rod 51 extends above the upper anchor plate 2. The upper end of the anchor rod 51 is used for threaded connection to the wind turbine nacelle 3, preferably to the nacelle connection device 31 of the wind turbine nacelle 3, and more preferably to the nacelle yaw bearing of the wind turbine nacelle 3. This ensures the connection stability of the wind turbine nacelle 3.

[0065] Furthermore, a washer can be inserted at the lower end of the anchor bolt 51, with the washer located between the nut 52 and the lower anchor plate 4.

[0066] As shown in Figures 1-6, the concrete cylinder 1 is also provided with a plurality of connecting anchor holes arranged at intervals along the circumference of the concrete cylinder 1. The connecting anchor holes penetrate the cylinder wall of the concrete cylinder 1 along the axial direction of the concrete cylinder 1 and are used to install prestressed anchors 6.

[0067] Specifically, multiple main anchor holes are located at the inner circumferential end of the concrete cylinder 1, and multiple connecting anchor holes are located at the outer circumferential end of the concrete cylinder 1, and are arranged at intervals along the circumference of the concrete cylinder 1. The connecting anchor holes penetrate the cylinder wall of the concrete cylinder 1 in the vertical direction to install connecting prestressed anchors 6. The concrete transition section and the concrete tower section are anchored and connected by the prestressed anchors 6 to ensure the compressive strength of the concrete transition section and the concrete tower section, so as to cooperate in bearing the wind turbine nacelle 3 and have high safety performance.

[0068] Preferably, multiple main anchor holes are arranged at equal intervals along the circumference of the concrete cylinder 1, the number of connecting anchor holes is a multiple of four, and they are arranged in multiple groups. Each group of connecting anchor holes includes four adjacent connecting anchor holes. The four connecting anchor holes are arranged at equal intervals along the circumference of the concrete cylinder 1. The multiple groups of connecting anchor holes are arranged at equal intervals along the circumference of the concrete cylinder 1, and the distance between two adjacent groups of connecting anchor holes is greater than the distance between two adjacent connecting anchor holes in each group.

[0069] As shown in Figure 1, the concrete cylinder 1 includes an outer cylinder section 12 and an inner cylinder section 13, which are integrally cast and connected. Both the outer cylinder section 12 and the inner cylinder section 13 are preferably cylindrical. The inner cylinder section 13 surrounds the inner circumference of the outer cylinder section 12. In other words, the outer circumferential surface of the inner cylinder section 13 is connected to the inner circumferential surface of the outer cylinder section 12.

[0070] The top surface of the inner cylinder section 13 is higher than the top surface of the outer cylinder section 12. The top surface of the inner cylinder section 13 forms the top surface of the concrete cylinder 1. The upper anchor plate 2 is provided on the top surface of the inner cylinder section 13. Preferably, the width of the upper anchor plate 2 is the same as the width of the inner cylinder section 13. The top surface of the outer cylinder section 12 forms a stepped surface on the outer circumference of the concrete cylinder 1.

[0071] The bottom surface of the inner cylinder section 13 is higher than the bottom surface of the outer cylinder section 12. The bottom surface of the inner cylinder section 13 forms the variable cross section 11 of the concrete cylinder 1. The lower anchor plate 4 is provided on the bottom surface of the inner cylinder section 13. Preferably, the width of the lower anchor plate 4 is smaller than the width of the inner cylinder section 13, and the annular center line of the lower anchor plate 4 coincides with the annular center line of the inner cylinder section 13.

[0072] Multiple main anchor holes are located in the inner cylinder section 13 and are arranged at intervals along the circumference of the inner cylinder section 13, and the main anchor holes penetrate the inner cylinder section 13 vertically. Multiple connecting anchor holes are located in the outer cylinder section 12 and are arranged at intervals along the circumference of the outer cylinder section 12, and the connecting anchor holes penetrate the outer cylinder section 12 vertically.

[0073] By setting up outer and inner cylinder sections, and placing multiple main anchor holes in the inner cylinder section and multiple connecting anchor holes in the outer cylinder section, the installation of anchor bolts, prestressed anchors and wind turbine nacelles can be facilitated, interference can be avoided, and the concrete transition section can be ensured to have high compressive strength.

[0074] As shown in Figure 1, the inner circumferential surface of the outer cylinder section 12 has an inclined surface 121. The inclined surface 121 connects the bottom surface of the outer cylinder section 12 and the variable cross section 11. The inclined surface 121 extends from bottom to top and is inclined towards the center line of the concrete cylinder 1. In other words, the inclined surface 121 is a conical shape that is narrow at the top and wide at the bottom. The top end of the inclined surface 121 is connected to the outer circumferential end of the variable cross section 11, and the bottom end of the inclined surface 121 is connected to the inner circumferential end of the bottom surface of the concrete cylinder 1.

[0075] The inclined surface ensures that the concrete cylinder has good structural stress, avoids stress concentration caused by abrupt changes in cross section, and facilitates demolding during the production of the concrete cylinder.

[0076] It is understood that the outer cylinder section 12 is not limited to having an inclined surface. In the embodiment shown in FIG6, the radial thickness of the outer cylinder section 12 is constant along the vertical direction, the inner circumferential surface of the outer cylinder section 12 extends vertically and is connected to the variable cross section 11.

[0077] As shown in Figure 1, a first sleeve 14, cast and fixed within the inner cylinder section 13, is provided. The first sleeve 14 penetrates the inner cylinder section 13 along its axial direction, meaning it penetrates the inner cylinder section 13 vertically. Multiple first sleeves 14 are arranged at intervals along the circumference of the inner cylinder section 13. The cavity of each first sleeve 14 forms a corresponding main anchor hole for inserting anchor rods 51, and for guiding and protecting the anchor rods 51. The first sleeve 14 is preferably a PVC pipe.

[0078] As shown in Figure 1, a second sleeve 15, cast and fixed within the wall of the outer cylinder section 12, is provided. The second sleeve 15 penetrates the wall of the outer cylinder section 12 along its axial direction; in other words, it penetrates the wall of the outer cylinder section 12 vertically. Multiple second sleeves 15 are arranged at intervals along the circumference of the outer cylinder section 12. The cavity of each second sleeve 15 forms a corresponding connecting anchor hole for inserting the prestressed anchor 6, and for guiding and protecting the prestressed anchor 6. The second sleeve 15 is preferably a prestressed corrugated pipe.

[0079] In the embodiment shown in Figure 3, the concrete cylinder 1 includes a main body 16, a grouting layer 17, and a leveling component 18. The grouting layer 17 is located on the top of the main body 16, the upper anchor plate 2 is located on the top surface of the grouting layer 17, and the leveling component 18 is located inside the grouting layer 17 and connected between the upper anchor plate 2 and the main body 16. Multiple leveling components 18 are arranged at intervals along the circumference of the concrete cylinder 1.

[0080] As shown in Figure 3, the inner cylinder section 13 includes a body and a grouting layer 17. The grouting layer 17 is located on the top of the body of the inner cylinder section 13 and is in the shape of a ring around the vertical direction. The body of the inner cylinder section 13 and the outer cylinder section 12 are preferably integrally cast and connected to form the main body 16. Therefore, the grouting layer 17 is located on the top of the main body 16, and the upper anchor plate 2 is located on the top surface of the grouting layer 17.

[0081] Multiple leveling components 18 are provided within the grouting layer 17. These components are arranged at intervals along the circumference of the concrete cylinder 1; in other words, they are arranged at intervals along the circumference of the grouting layer 17. Each leveling component 18 is connected between the upper anchor plate 2 and the main body 16 to drive the upper anchor plate 2 to move vertically relative to the main body 16. This allows the leveling of the upper anchor plate 2 to be adjusted by the multiple leveling components 18, ensuring that the leveling of the upper anchor plate 2 meets the installation requirements of the wind turbine nacelle 3.

[0082] It should be noted that the main body 16 is first cast and shaped, then multiple leveling components 18 are set on the main body 16 and leveled, and the upper anchor plate 2 is installed, and then the grouting layer 17 is cast. Therefore, the multiple leveling components 18 are cast and fixed inside the grouting layer 17, and the upper anchor plate 2 is cast and fixed on the top surface of the grouting layer 17. After the grouting layer 17 is cast and shaped, the leveling components 18 cannot adjust the upper anchor plate 2 again.

[0083] As shown in Figure 4, the leveling assembly 18 includes a base nut 181, an adjusting nut 182, and a screw 183. The screw 183 extends along the axial direction of the concrete cylinder 1. The base nut 181 is located on the screw 183 and abuts against the top surface of the main body 16. The adjusting nut 182 is located on the top of the screw 183 and abuts against the bottom surface of the upper anchor plate 2. At least the adjusting nut 182 can move along the axial direction of the screw 183 relative to the screw 183.

[0084] Specifically, the screw 183 extends vertically, with a base nut 181 threadedly connected to its bottom and an adjusting nut 182 threadedly connected to its top. Both the base nut 181 and the adjusting nut 182 are vertically movable relative to the screw 183. The base nut 181 abuts against the top surface of the main body 16, therefore the bottom of the screw 183 cannot extend below the base nut 181. The top surface of the adjusting nut 182 abuts against the bottom surface of the upper anchor plate 2, therefore the top of the screw 183 cannot extend above the adjusting nut 182. The base nut 181 and the adjusting nut 182 are preferably fine-threaded nuts.

[0085] When adjusting the leveling assembly 18, the height position of the adjusting nut 182 relative to the screw 183 is changed by rotating the adjusting nut 182, thereby adjusting the vertical movement of the upper anchor plate 2 relative to the main body 16. When the adjusting nut 182 cannot adjust the upper anchor plate 2 into place, the base nut 181 can be further rotated to change the height position of the base nut 181 relative to the screw 183, further adjusting the vertical movement of the upper anchor plate 2 relative to the main body 16 to ensure the flatness of the upper anchor plate 2.

[0086] Embodiments of the present invention also propose two production processes for concrete transition sections.

[0087] The first production process for the concrete transition section includes placing the upper anchor plate 2 in an inverted casting mold and abutting against the bottom surface of the inverted casting mold, the bottom surface of which has a certain degree of flatness. Concrete is poured into the inverted casting mold to form a concrete cylinder 1, and the lower anchor plate 4 is placed during or before the pouring process.

[0088] Specifically, the first production process for the concrete transition section is used to produce the concrete transition section shown in Figure 1. First, an inverted casting mold is set up, ensuring the bottom surface of the mold has a certain degree of flatness. Then, an upper anchor plate 2 and a lower anchor plate 4 are placed in the inverted casting mold, with the upper anchor plate 2 abutting against the bottom surface of the mold to ensure the flatness of the upper anchor plate 2. Concrete is poured into the inverted casting mold to form an inverted concrete cylinder 1, and both the upper anchor plate 2 and the lower anchor plate 4 are cast and fixed to the concrete cylinder 1. After the inverted concrete cylinder 1 is formed, the upper anchor plate 2, the inverted concrete cylinder 1, and the lower anchor plate 4 are demolded, and then the inverted concrete cylinder 1 is flipped back to its upright position.

[0089] It is understood that the lower anchor plate is not limited to being placed in the inverted casting mold before casting; in other embodiments, the lower anchor plate is placed during the casting process.

[0090] The first production process for the concrete transition section in this embodiment of the invention involves casting the concrete transition section in an inverted manner using an inverted casting mold. By abutting the bottom surface of the inverted casting mold against the upper anchor plate, the flatness of the upper anchor plate is ensured, thereby ensuring the flatness of the concrete transition section for installing the wind turbine nacelle.

[0091] Furthermore, while placing the anchor plate 2 in the inverted casting mold, multiple first sleeves 14 and multiple second sleeves 15 are placed in the inverted casting mold, and then concrete is poured into the inverted casting mold.

[0092] Preferably, both the anchor bolt 5 and the prestressed anchor 6 are installed during the hoisting of the concrete transition section.

[0093] The second production process for the concrete transition section includes placing the lower anchor plate 4 in an upright casting mold. Concrete is poured into the upright casting mold to form the main body 16. Multiple leveling components 18 are installed on the top surface of the main body 16 and leveled. The upper anchor plate 2 is placed on the multiple leveling components 18. A grouting template is installed between the top surface of the main body 16 and the upper anchor plate 2. Grouting material is poured into the grouting template to form a grouting layer 17.

[0094] Specifically, the second production process for the concrete transition section is used to produce the concrete transition section shown in Figure 3. First, an upright casting mold is set up, and the lower anchor plate 4 is placed in the upright casting mold. Then, concrete is poured into the upright casting mold to form the upright main body 16. The lower anchor plate 4 is then cast and fixed on the variable cross section 11 of the main body 16. Finally, the lower anchor plate 4 and the main body 16 are demolded.

[0095] After the lower anchor plate 4 and the main body 16 are demolded, multiple leveling components 18 are installed on the top surface of the main body 16. These components are spaced apart circumferentially around the main body 16. The components are then leveled. The upper anchor plate 2 is placed on the leveling components 18, and a grouting template is installed between the top surface of the main body 16 and the upper anchor plate 2. Grout is poured into the space surrounding the top surface of the main body 16, the upper anchor plate 2, and the grouting template to form a grouting layer 17. The main body 16, the grouting layer 17, and the upper anchor plate 2 are then cast and fixedly connected. After the grouting layer 17 is formed, the grouting template is removed.

[0096] The production process of the concrete transition section in this embodiment of the invention involves sequentially pouring the main body of the concrete cylinder and the grouting layer. Before pouring the grouting layer, multiple leveling components located on the main body are adjusted to ensure that the upper anchor plate has a certain degree of flatness. Then, the grouting layer is poured to maintain a certain degree of flatness of the upper anchor plate, thereby ensuring the flatness of the wind turbine nacelle installed in the concrete transition section.

[0097] Furthermore, while placing the lower anchor plate 4 in the upright casting mold, multiple first sleeves 14 and multiple second sleeves 15 are placed in the upright casting mold, and then concrete is poured into the upright casting mold.

[0098] Preferably, both the anchor bolt 5 and the prestressed anchor 6 are installed during the hoisting of the concrete transition section.

[0099] As shown in Figures 1-6, the wind turbine generator set of this embodiment includes a concrete tower section 7, a concrete transition section, a prestressed anchor 6, and a wind turbine nacelle 3.

[0100] Multiple concrete tower sections 7 are arranged sequentially along the vertical direction. A concrete transition section, as described in this embodiment, is located on the top concrete tower section 7. Prestressed anchors 6 extend vertically and are sequentially inserted into the walls of the concrete cylinder 1 and the walls of the multiple concrete tower sections 7; alternatively, they are sequentially inserted into the walls of the concrete cylinder 1 and the cavities of the multiple concrete tower sections 7. The prestressed anchors 6 are arranged at circumferential intervals along the concrete tower sections 7 and the concrete transition section. A wind turbine nacelle 3 is connected to the concrete transition section.

[0101] Specifically, as shown in Figure 5, multiple concrete tower sections 7 are arranged sequentially in the vertical direction. The topmost concrete tower section 7 is provided with a concrete transition section, and a wind turbine nacelle 3 is provided on the concrete transition section. Preferably, the nacelle connection device 31 of the wind turbine nacelle 3 is supported on the upper anchor plate 2 and connected to the top of multiple anchor bolts 5.

[0102] The concrete tower section 7 is provided with multiple tower anchor holes, which penetrate the concrete tower section 7 vertically. The multiple tower anchor holes are arranged at intervals along the circumference of the concrete tower section 7 and are connected one-to-one with the multiple connecting anchor holes of the concrete transition section. Corresponding prestressed anchors 6 are inserted in the connecting anchor holes and the multiple tower anchor holes connected in the vertical direction, so as to anchor the concrete transition section and the multiple concrete tower sections 7 through the multiple prestressed anchors 6.

[0103] Preferably, a second sleeve is also provided in the wall of the concrete tower section 7, which is cast and fixed. The second sleeve penetrates the wall of the concrete tower section 7 in a vertical direction. Multiple second sleeves are arranged at intervals along the circumference of the concrete tower section 7. The cavity of each second sleeve forms a corresponding tower anchor hole for inserting the prestressed anchor 6.

[0104] It is understandable that the prestressed anchor 6 is not limited to being sequentially installed on the wall of the concrete cylinder 1 and the wall of multiple concrete tower sections 7.

[0105] In the embodiment shown in Figure 6, the prestressed anchor 6 is sequentially inserted into the wall of the concrete cylinder 1 and the inner cavity of multiple concrete tower sections 7.

[0106] Specifically, the radial thickness of the outer cylinder section 12 is constant along the vertical direction and is greater than the radial thickness of the concrete tower section 7. The outer periphery of the outer cylinder section 12 is located on the topmost concrete tower section 7, while the inner periphery of the outer cylinder section 12 is suspended and pierced by multiple prestressed anchors 6. Therefore, the prestressed anchors 6 and the concrete tower section 7 are staggered in the horizontal plane. The prestressed anchors 6 are anchored to the top of the concrete cylinder 1, specifically to the top surface of the outer cylinder section 12, from top to bottom. Then, they are inserted into the connecting anchor holes of the concrete cylinder 1 and then through the inner cavities of multiple concrete tower sections 7. At this point, the concrete tower section 7 may not have tower anchor holes.

[0107] Preferably, the topmost concrete tower section 7 is a variable diameter section, and the remaining concrete tower sections 7 are straight tower sections. The wall of the straight tower section extends vertically, and the radial thickness of the straight tower section and the variable diameter section is constant in the up-down direction. The wall of the variable diameter section extends from bottom to top and is inclined toward the center line of the variable diameter section. The variable diameter section connects the straight tower section and the outer peripheral end of the outer cylinder section 12.

[0108] It is understood that the topmost concrete tower section is not limited to a variable diameter section. In other embodiments, all concrete tower sections are straight tower sections, or at least some concrete tower sections are straight tapered straight tower sections.

[0109] The wind turbine generator set of this invention uses a concrete tower section and a concrete transition section to jointly support the wind turbine nacelle, and uses tensioned prestressed anchors to meet the prestress requirements, thereby ensuring that the concrete tower section and the concrete transition section have certain compressive strength, and ensuring the flatness and stability of the wind turbine nacelle installation, so as to be able to support the wind turbine nacelle and have high safety performance. At the same time, the size of the concrete tower section can be reduced to reduce the structural complexity and cost of the tower. In addition, the wind turbine generator set can also achieve high supply chain delivery efficiency.

[0110] Furthermore, the top surfaces of at least two concrete tower sections 7 at the upper end are provided with leveling shims for leveling purposes.

[0111] The construction process for wind turbine generator sets according to this invention includes sequentially hoisting multiple concrete tower sections 7. Hoisting and pouring connected upper anchor plates 2, concrete cylinders 1, and lower anchor plates 4. Installing and tensioning multiple prestressed anchors 6. Hoisting the wind turbine nacelle 3. Installing and tensioning multiple anchor bolts 5, with the top of the anchor bolts 5 connected to the wind turbine nacelle 3.

[0112] Specifically, multiple concrete tower sections 7 are first hoisted vertically in sequence so that they are arranged vertically. Preferably, in at least two of the upper concrete tower sections 7, each concrete tower section 7 is leveled using leveling shims after hoisting.

[0113] The upper anchor plate 2, concrete cylinder 1, and lower anchor plate 4 are hoisted and poured together, and then placed on the topmost concrete tower section 7. Multiple prestressed anchors 6 are then inserted and tensioned into the walls of the concrete cylinder 1 and the walls of the multiple concrete tower sections 7, or, alternatively, multiple prestressed anchors 6 are inserted and tensioned into the walls of the concrete cylinder 1 and the cavities of the multiple concrete tower sections 7. The prestressed anchors 6 are then subjected to anti-corrosion and sealing treatment.

[0114] The wind turbine nacelle 3 is hoisted and placed on the upper anchor plate 2, the concrete cylinder 1 and the lower anchor plate 4 that are cast together. The nacelle connection device 31 of the wind turbine nacelle 3 is supported on the upper anchor plate 2 and makes reliable contact.

[0115] Multiple anchor bolts 5 are inserted into the cast-in-place upper anchor plate 2, concrete cylinder 1, and lower anchor plate 4, with the upper ends of the anchor bolts 5 connected to the nacelle connection device 31 of the wind turbine nacelle 3. Then, the anchor bolts 5 are tensioned and fixed. Preferably, the anchor rod 51 is inserted upwards through the lower anchor hole, and the upper end of the anchor rod 51 is threaded to the nacelle connection device 31. Then, tensioning is performed using the direct tensioning method, and the nut 52 is tightened. Therefore, the lower anchor plate 4 also serves to position the anchor rod 51. The anchor bolts 5 are then subjected to anti-corrosion and sealing treatment.

[0116] The construction process for wind turbine generator sets described in this invention ensures smooth installation, safety, and the flatness and stability of the nacelle installation. Furthermore, since the components requiring hoisting are limited to the concrete tower section, concrete transition section, and nacelle, the variety of hoisting components is reduced. Moreover, since the concrete tower section and concrete transition section are both made of cast concrete, the types and number of hoisting tools can be effectively reduced, resulting in a less complex construction process and higher efficiency.

[0117] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A concrete transition section, characterized in that, include: A concrete cylinder with a variable cross-section on its inner circumferential surface, and a plurality of main anchor holes arranged at intervals along the circumference of the concrete cylinder, the main anchor holes extending from the variable cross-section to the top surface of the concrete cylinder; The upper anchor plate is provided on the top surface of the concrete cylinder. The upper anchor plate has multiple upper anchor holes that correspond one-to-one with the multiple main anchor holes. The upper anchor plate is used to support the wind turbine nacelle. The lower anchor plate is provided on the variable cross section of the concrete cylinder, and the lower anchor plate is provided with a plurality of lower anchor holes that correspond one-to-one with the plurality of main anchor holes; Anchor bolts, a plurality of anchor bolts are used to pass through a plurality of corresponding and connected upper anchor holes, main anchor holes and lower anchor holes in a one-to-one manner. The lower end of the anchor bolt is connected to the lower anchor plate and the upper end of the anchor bolt is used to connect to the wind turbine nacelle.

2. The concrete transition section according to claim 1, characterized in that, The upper anchor plate is used to support the nacelle connection device of the wind turbine nacelle, and the top of the anchor bolt is used to connect the nacelle connection device of the wind turbine nacelle.

3. The concrete transition section according to claim 1, characterized in that, The upper anchor plate is an annular ring extending circumferentially along the concrete cylinder, and the lower anchor plate is an annular ring extending circumferentially along the concrete cylinder. The thickness of the upper anchor plate is greater than the thickness of the lower anchor plate, and the width of the upper anchor plate is greater than the width of the lower anchor plate.

4. The concrete transition section according to claim 1, characterized in that, The anchor bolt includes an anchor rod and a nut. The anchor rod passes through the corresponding upper anchor hole, the main anchor hole and the lower anchor hole. The lower end of the anchor rod is provided with the nut, which abuts against the lower anchor plate. The upper end of the anchor rod is provided with a thread, which is used to connect to the wind turbine nacelle.

5. The concrete transition section according to claim 1, characterized in that, The concrete cylinder is formed by casting ultra-high performance concrete.

6. The concrete transition section according to claim 1, characterized in that, The upper anchor plate is cast and fixed to the top surface of the concrete cylinder, and the lower anchor plate is cast and fixed to the variable cross-section of the concrete cylinder.

7. The concrete transition section according to claim 1, characterized in that, The concrete cylinder is provided with a plurality of connecting anchor holes arranged at intervals along the circumference of the concrete cylinder. The connecting anchor holes penetrate the cylinder wall along the axial direction of the concrete cylinder and are used to install prestressed anchors.

8. The concrete transition section according to claim 7, characterized in that, The concrete cylinder includes an outer cylinder section and an inner cylinder section. The inner cylinder section surrounds the inner circumference of the outer cylinder section. The top surface of the inner cylinder section is higher than the top surface of the outer cylinder section and forms the top surface of the concrete cylinder. The bottom surface of the inner cylinder section is higher than the bottom surface of the outer cylinder section and forms the variable cross-section of the concrete cylinder. The connecting anchor hole is located in the outer cylinder section and penetrates the outer cylinder section along the axial direction of the concrete cylinder.

9. The concrete transition section according to claim 8, characterized in that, The inner circumferential surface of the outer cylinder section has an inclined surface, which connects the bottom surface of the outer cylinder section and the variable cross-section. The inclined surface extends from bottom to top and is inclined toward the centerline of the concrete cylinder.

10. The concrete transition section according to claim 8, characterized in that, The inner cylinder section has a first sleeve cast and fixed inside its cylinder wall. The first sleeve penetrates the cylinder wall of the inner cylinder section along its axial direction, and the cavity of the first sleeve forms the main anchor hole.

11. The concrete transition section according to claim 8, characterized in that, The outer cylinder section has a second sleeve cast and fixed inside its cylinder wall. The second sleeve penetrates the cylinder wall of the outer cylinder section along its axial direction, and the cavity of the second sleeve forms the connecting anchor hole.

12. The concrete transition section according to claim 1, characterized in that, The concrete cylinder includes a main body, a grouting layer, and a leveling assembly. The grouting layer is located on top of the main body, the upper anchor plate is located on the top surface of the grouting layer, and the leveling assembly is located inside the grouting layer and connected between the upper anchor plate and the main body. Multiple leveling assemblies are arranged at intervals along the circumference of the concrete cylinder.

13. The concrete transition section according to claim 12, characterized in that, The leveling assembly includes a base nut, an adjusting nut, and a screw rod. The screw rod extends axially along the concrete cylinder. The base nut is mounted on the screw rod and abuts against the top surface of the main body. The adjusting nut is mounted on the top of the screw rod and abuts against the bottom surface of the upper anchor plate. At least the adjusting nut is movable relative to the screw rod along the axial direction of the screw rod.

14. A production process for the concrete transition section according to any one of claims 1-13, characterized in that, include: The upper anchor plate is placed in the inverted casting mold and abuts against the bottom surface of the inverted casting mold, the bottom surface of the inverted casting mold having a certain degree of flatness; Concrete is poured into the inverted casting mold to form the concrete cylinder, and the lower anchor plate is placed during or before the pouring process.

15. A production process for the concrete transition section as described in claim 12 or 13, characterized in that, include: Place the lower anchor plate in the upright casting mold; Concrete is poured into the upright casting mold to form the main body; Multiple leveling components are provided on the top surface of the main body, and leveling is performed. The upper anchor plate is placed on the plurality of leveling components; A grouting template is provided between the top surface of the main body and the upper anchor plate; Grouting material is poured into the grouting template to form the grouting layer.

16. A wind turbine generator set, characterized in that, include: Concrete tower sections, multiple concrete tower sections are arranged sequentially along the vertical direction; A concrete transition section, wherein the concrete transition section is the concrete transition section according to any one of claims 1-13, and the concrete transition section is provided on the concrete tower section located at the top; The prestressed anchor extends vertically and is sequentially inserted into the wall of the concrete cylinder and the wall of a plurality of concrete tower sections; or, the prestressed anchor is sequentially inserted into the wall of the concrete cylinder and the inner cavity of a plurality of concrete tower sections, and the plurality of prestressed anchors are arranged at circumferential intervals along the concrete tower section and the concrete transition section. Wind turbine nacelle, which is connected to the concrete transition section.

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