A wind turbine foundation cap based on steel-concrete

Abstract

The present invention provides a wind turbine foundation pedestal based on steel-concrete, comprising a steel frame and a concrete covering layer, wherein the steel frame is arranged inside the concrete covering layer, and the steel frame comprises annular wall panels and radial support beams, wherein there are a plurality of the annular wall panels, and the plurality of the annular wall panels are sequentially spliced ​​and closed into a ring, and each of the annular wall panels is provided with the radial support beam on the side away from the center of the closed loop; and the bottom of the radial support beam is provided with embedded piles. The present application provides a wind turbine foundation pedestal based on steel-concrete, which has high structural rigidity, high bearing capacity, excellent fatigue resistance, and good mechanical properties, and is conducive to promoting the application of high-power wind turbines. When constructing the pedestal, bolt connection and welding are mainly used, and only steel bars need to be tied when laying the concrete cushion layer, and the workload of steel bar tying is small, the construction is convenient, and the construction progress is fast.

Description

Technical Field

[0001] The invention relates to the technical field of towers, and in particular to a wind turbine foundation bearing platform based on steel-concrete. Background Art

[0002] Wind power generation is one of the most mature, large-scale development conditions and commercial development prospects in the field of renewable energy. At the same time, wind resources are widely distributed and abundant in the world. According to GWEC statistics, as of the end of 2019, the global cumulative installed capacity of wind power was 651GW, an increase of more than 26 times compared to the end of 2001, with an average annual compound growth rate of about 20.12%. As of now, China has become the world's largest wind power market. According to statistics from the China Wind Energy Association, the country's cumulative installed capacity of wind power is 2.1 billion kilowatts, of which 204 million kilowatts of onshore wind power and 5.93 million kilowatts of offshore wind power, with an annual power generation of 405.7 billion kilowatt-hours, accounting for 5.54% of the country's power generation, becoming the third largest source of electricity after thermal power and hydropower.

[0003] In order to obtain higher wind speeds and accelerate the development of resources in low wind speed areas, the height of the wind turbine tower structure needs to be greatly increased, and the bearing requirements for the foundation pedestal are also greatly increased. Traditional concrete pedestals use a huge amount of steel bars, are difficult to tie, have a long construction period, and have a large diameter and floor space. For larger wind turbines, traditional concrete pedestals are difficult to meet the requirements, and the large prestress applied can easily cause local pressure damage to the concrete at the bottom of the pedestal. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides a wind turbine foundation cap based on steel-concrete, which solves the technical problems of traditional concrete caps, such as huge amount of steel bars, difficulty in steel bar binding, long construction period, large cap diameter and large floor area.

[0005] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0006] A wind turbine foundation pedestal based on steel-concrete, comprising a steel frame and a concrete sheathing layer, wherein the steel frame is arranged inside the concrete sheathing layer, the steel frame comprises an annular wall plate and a radial support beam, the annular wall plate is provided with a plurality of the annular wall plates, the plurality of the annular wall plates are sequentially spliced ​​and closed into a ring, and each of the annular wall plates is provided with the radial support beam on a side away from the center of the closed loop; the annular wall plate comprises a first web plate, a second web plate and a third web plate, the first web plate is sandwiched between the second web plate and the third web plate, the second web plate is located near the first web plate The third web is located on one side of the closed loop center and is perpendicular to the first web, and the third web is located on the side of the first web away from the closed loop center and is perpendicular to the first web; both ends of the first web are provided with annular connecting end plates, and the two annular connecting end plates form an angle, and two adjacent annular wall panels are connected by the annular connecting end plates, the second web is provided with an inner end plate at the end away from the first web, and the third web is provided with an outer end plate at the end away from the first web, and the outer end plate is fixedly connected to the radial support beam on the side away from the third web, and embedded piles are provided at the bottom of the radial support beam.

[0007] Optionally, a bottom plate is further provided at the bottom of the annular wall plate, the bottom plate is respectively connected to the first web plate, the second web plate and the third web plate, and at least two embedded anchor rods are penetrated through the bottom plate.

[0008] Optionally, the base plate includes a first angle plate, a second angle plate, a third angle plate and a fourth angle plate, the first angle plate is clamped between the inner side of the first web plate and the left side of the second web plate, the second angle plate is clamped between the inner side of the first web plate and the right side of the second web plate, the third angle plate is clamped between the outer side of the first web plate and the left side of the third web plate, and the fourth angle plate is clamped between the outer side of the first web plate and the right side of the third web plate.

[0009] Optionally, a concrete cushion layer is provided at the bottom of the annular wall panel, and the embedded anchor rods extend into the concrete cushion layer.

[0010] Optionally, the radial support beam includes a rib plate, a lower wing plate and an upper wing plate, the rib plate is clamped between the lower wing plate and the upper wing plate, the lower wing plate is parallel to the ground, and the upper wing plate is inclined.

[0011] Optionally, a plurality of bolts are provided on both side surfaces of the first web, on a side of the inner end plate away from the second web, on a side of the outer end plate away from the third web, and on a side of the upper wing plate away from the rib plate.

[0012] Optionally, a plurality of U-shaped ribs are provided on both side surfaces of the first web, on a side of the inner end plate away from the second web, on a side of the outer end plate away from the third web, and on a side of the upper wing plate away from the rib plate.

[0013] Optionally, a prestressed connecting plate is provided on a side of the inner end plate away from the second web plate, and prestressed tendons are provided on the prestressed connecting plate. The prestressed tendons vertically penetrate the concrete sheathing layer upward.

[0014] Optionally, the prestressed connecting plate is welded to at least two adjacent inner end plates simultaneously.

[0015] Optionally, at least three prestressed connecting plates are provided, and the three prestressed connecting plates are evenly distributed around the center of the closed loop.

[0016] It can be seen from the above technical solution that the beneficial effects of the present invention are:

[0017] The present invention provides a wind turbine foundation cap based on steel-concrete.

[0018] The present invention provides a wind turbine foundation pedestal based on steel-concrete, comprising a steel frame and a concrete covering layer, wherein the steel frame is arranged inside the concrete covering layer, and the steel frame comprises annular wall panels and radial support beams, wherein there are a plurality of the annular wall panels, and the plurality of the annular wall panels are sequentially spliced ​​and closed into a ring, and each of the annular wall panels is provided with the radial support beam on the side away from the center of the closed loop; and the bottom of the radial support beam is provided with embedded piles. The present application provides a wind turbine foundation pedestal based on steel-concrete, which has high structural rigidity, high bearing capacity, excellent fatigue resistance, and good mechanical properties, and is conducive to promoting the application of high-power wind turbines. When constructing the pedestal, bolt connection and welding are mainly used, and only steel bars need to be tied when laying the concrete cushion layer, and the workload of steel bar tying is small, the construction is convenient, and the construction progress is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0020] Figure 1 It is a structural diagram of the steel frame;

[0021] Figure 2 The schematic diagram of the foundation cap structure;

[0022] Figure 3 is a top view of the annular wall panel;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the annular wall panel;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the radial support beam;

[0025] Figure 6 It is a structural schematic diagram of the prestressed connecting plate and the prestressed tendons;

[0026] Reference numerals:

[0027] 1-annular wall plate, 2-radial support beam, 3-prestressed connection plate, 4-prestressed tendons, 5-concrete cushion layer, 6-concrete covering layer;

[0028] 11-first web, 12-second web, 13-third web, 14-annularly connected end plate, 15-inner end plate, 16-outer end plate, 17-bolts, 18-bottom plate, 19-embedded anchor rods, 21-rib plate, 22-lower wing plate, 23-upper wing plate. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0030] In the description of the present application, it should be understood that the terms "left side", "right side", "inside", "outside", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc., are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0031] See also Figure 1-4The present invention provides a wind turbine foundation pedestal based on steel-concrete, comprising a steel frame and a concrete coating layer 6, wherein the steel frame is arranged inside the concrete coating layer 6. The steel frame comprises an annular wall plate 1 and a radial support beam 2, wherein the annular wall plate 1 has a plurality of annular wall plates 1, and the plurality of annular wall plates 1 are sequentially spliced ​​to form a closed ring, and each annular wall plate 1 is provided with the radial support beam 2 on the side away from the closed loop center. The annular wall plate 1 comprises a first web plate 11, a second web plate 12 and a third web plate 13, wherein the first web plate 11 is sandwiched between the second web plate 12 and the third web plate 13, wherein the second web plate 12 is located on the side of the first web plate 11 close to the closed loop center and is perpendicular to the first web plate 11, and the third web plate 13 is located on the side of the first web plate 11 away from the closed loop center and is perpendicular to the first web plate 11. Both ends of the first web plate 11 are provided with annular connecting end plates 14, wherein the two annular connecting end plates 14 form an angle, and two adjacent annular wall plates 1 are connected by the annular connecting end plates 14. The second web 12 is provided with an inner end plate 15 at one end away from the first web 11, and the third web 13 is provided with an outer end plate 16 at one end away from the first web 11. The outer end plate 16 is fixedly connected to the radial support beam 2 at one side away from the third web 13, and a pre-buried pile is provided at the bottom of the radial support beam 2. The second web 12 and the third web 13 are provided to increase the structural strength of the first web 11, and the inner end plate 15 and the outer end plate 16 are provided to increase the contact area and bonding performance between the annular wall plate 1 and the concrete coating layer 6, thereby improving the firmness. Since the tower is hollow, the load of the foundation pedestal is concentrated in the annular area below the tower wall. The annular wall plate 1 described in the present application is correspondingly arranged below the tower wall. The radial support beam 2 is welded to the annular wall plate 1, and pre-buried piles are arranged before the pedestal is arranged. When the steel frame is arranged, the radial support beam 2 is abutted against the top of the pre-buried piles to transfer the upper tower load through the pre-buried piles.

[0032] As a further improvement to the above solution, a bottom plate 18 is further provided at the bottom of the annular wall panel 1, and the bottom plate 18 is respectively connected to the first web 11, the second web 12 and the third web 13, and at least two embedded anchor rods 19 are provided through the bottom plate 18. Specifically, a concrete cushion layer 5 is provided at the bottom of the annular wall panel 1, and the embedded anchor rods 19 extend into the concrete cushion layer 5. The annular wall panel 1 is fixed to the bottom concrete cushion layer 5 by setting the anchor rods, and at the same time, the anchor rods and the embedded piles share the upper load. For an embodiment, please refer to Figure 3The bottom plate 18 includes a first angle plate, a second angle plate, a third angle plate and a fourth angle plate, wherein the first angle plate is sandwiched between the inner side of the first web 11 and the left side of the second web 12, the second angle plate is sandwiched between the inner side of the first web 11 and the right side of the second web 12, the third angle plate is sandwiched between the outer side of the first web 11 and the left side of the third web 13, and the fourth angle plate is sandwiched between the outer side of the first web 11 and the right side of the third web 13. The bottom plate 18 is used to connect the embedded anchor rods 19 and also serves as a reinforcing rib between the first web 11 and the second web 12 and between the first web 11 and the third web 13, thereby increasing the structural stability of the annular wall plate 1.

[0033] As a further improvement to the above scheme, please refer to Figure 5 The radial support beam 2 includes a rib plate 21, a lower wing plate 22 and an upper wing plate 23. The rib plate 21 is sandwiched between the lower wing plate 22 and the upper wing plate 23. The lower wing plate 22 is parallel to the ground, and the upper wing plate 23 is inclined. Preferably, steel bars are reserved on the top surface of the embedded piles. The embedded steel bars penetrate the lower wing plate 22 and are tied to the radial support beam 2, so that when the concrete covering layer 6 is poured, the radial support beam 2 is firmly combined with the embedded piles.

[0034] As a further improvement to the above solution, a plurality of studs 17 and / or a plurality of U-shaped ribs are provided on both sides of the first web 11, on the side of the inner end plate 15 away from the second web 12, on the side of the outer end plate 16 away from the third web 13, and on the side of the upper wing plate 23 away from the rib plate 21. The studs 17 and / or U-shaped ribs are provided to further improve the bonding performance between the annular wall plate 1 and the concrete covering layer 6, thereby improving the bearing capacity and splitting resistance of the cap.

[0035] As a further improvement to the above scheme, a prestressed connection plate 3 is provided on the side of the inner end plate 15 away from the second web 12, and a prestressed rib 4 is provided on the prestressed connection plate 3, and the prestressed rib 4 vertically penetrates the concrete sheath 6 upward. The prestressed connection plate 3 is welded to at least two adjacent inner end plates 15 at the same time. The prestressed connection plate 3 is welded to the inner end plate 15 as a whole, which can disperse the concentrated stress at the prestressing application point, and solve the problem of local compressive damage of concrete at the prestressed end. At least three prestressed connection plates 3 are provided, and the three prestressed connection plates 3 are evenly distributed around the center of the closed loop to evenly disperse the load.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The steel-concrete cap is used instead of the traditional concrete cap, which increases the bearing capacity and overall rigidity of the cap, while reducing the amount of steel bars and wet work workload. All components can be prefabricated in the processing plant, assembled and welded on site, and the construction speed is greatly improved. It has a wide range of applications in larger and higher-power wind turbines;

[0038] 2. The prestressed connecting plate and prestressed tendons are used at the bottom of the pedestal to solve the problem of local concrete pressure at the end of the prestressed tendons and meet the requirement of applying greater prestress to the tower;

[0039] 3. The steel concrete cap has high bearing capacity and good integrity. For wind turbine systems with the same parameters, compared with traditional concrete caps, the steel concrete cap is smaller in size and uses less material;

[0040] 4. Shear connectors such as studs or U-shaped bars are installed on the annular wall panels and radial support beams, which can effectively connect the steel frame with the concrete and improve the bearing capacity and splitting resistance of the pedestal.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A wind turbine foundation cap based on steel-concrete, characterized in that: The invention comprises a steel frame and a concrete covering layer (6), wherein the steel frame is arranged inside the concrete covering layer (6), the steel frame comprises an annular wall plate (1) and radial support beams (2), the annular wall plates (1) are provided in plurality, the plurality of annular wall plates (1) are sequentially spliced ​​to form a closed ring, and each annular wall plate (1) is provided with the radial support beam (2) on a side away from the closed ring center; the annular wall plate (1) comprises a first web plate (11), a second web plate (12) and a third web plate (13), the first web plate (11) is sandwiched between the second web plate (12) and the third web plate (13), the second web plate (12) is located on a side of the first web plate (11) close to the closed ring center and is connected to the first web plate (11). The third web (13) is located on a side of the first web (11) away from the closed loop center and is perpendicular to the first web (11); both ends of the first web (11) are provided with annular connecting end plates (14), the two annular connecting end plates (14) form an angle, and two adjacent annular wall plates (1) are connected via the annular connecting end plates (14); the second web (12) is provided with an inner end plate (15) at one end away from the first web (11); the third web (13) is provided with an outer end plate (16) at one end away from the first web (11); the outer end plate (16) is fixedly connected to the radial support beam (2) at one side away from the third web (13); and the bottom of the radial support beam (2) is provided with embedded piles; A bottom plate (18) is also provided at the bottom of the annular wall plate (1), and the bottom plate (18) is respectively connected to the first web plate (11), the second web plate (12) and the third web plate (13), and at least two embedded anchor rods (19) are provided through the bottom plate (18); The radial support beam (2) comprises a rib plate (21), a lower wing plate (22) and an upper wing plate (23), the rib plate (21) being sandwiched between the lower wing plate (22) and the upper wing plate (23), the lower wing plate (22) being parallel to the ground, and the upper wing plate (23) being arranged at an inclination.

2. The wind turbine foundation cap based on steel-concrete according to claim 1 is characterized in that: The bottom plate (18) comprises a first angle plate, a second angle plate, a third angle plate and a fourth angle plate, wherein the first angle plate is clamped between the inner side of the first web (11) and the left side of the second web (12), the second angle plate is clamped between the inner side of the first web (11) and the right side of the second web (12), the third angle plate is clamped between the outer side of the first web (11) and the left side of the third web (13), and the fourth angle plate is clamped between the outer side of the first web (11) and the right side of the third web (13).

3. The wind turbine foundation cap based on steel-concrete according to claim 2 is characterized in that: A concrete cushion layer (5) is provided at the bottom of the annular wall panel (1), and the embedded anchor rods (19) extend into the concrete cushion layer (5).

4. The wind turbine foundation cap based on steel-concrete according to claim 1 is characterized in that: A plurality of bolts (17) are provided on both side surfaces of the first web (11), on a side of the inner end plate (15) away from the second web (12), on a side of the outer end plate (16) away from the third web (13), and on a side of the upper wing plate (23) away from the rib plate (21).

5. The wind turbine foundation cap based on steel-concrete according to claim 4 is characterized in that: A plurality of U-shaped ribs are provided on both side surfaces of the first web (11), on a side of the inner end plate (15) away from the second web (12), on a side of the outer end plate (16) away from the third web (13), and on a side of the upper wing plate (23) away from the rib plate (21).

6. A wind turbine foundation cap based on steel-concrete according to any one of claims 1 to 5, characterized in that: A prestressed connection plate (3) is provided on the side of the inner end plate (15) away from the second web plate (12), and prestressed tendons (4) are provided on the prestressed connection plate (3), and the prestressed tendons (4) vertically penetrate the concrete covering layer (6) upwards.

7. The wind turbine foundation cap based on steel-concrete according to claim 6 is characterized by: The prestressed connection plate (3) is welded to at least two adjacent inner end plates (15) at the same time.

8. The wind turbine foundation cap based on steel-concrete according to claim 7 is characterized in that: At least three prestressed connection plates (3) are provided, and the three prestressed connection plates (3) are evenly distributed around the center of the closed loop.

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