Concrete tower connection device and wind turbine support structure

Abstract

The present invention belongs to the technical field of wind power generation, and provides a concrete tower connection device and a wind turbine support structure. The concrete tower connection device includes a platform, the platform is provided with a through hole, and the platform is provided with a plurality of steel strand through holes and a plurality of first bolting holes around the through hole. Steel strands are passed through the steel strand through holes to connect the concrete tower, and bolting parts are passed through the first bolting holes to connect the wind turbine foundation. The steel strands can press the concrete tower tightly against the top of the concrete tower connection device, and the first bolting holes avoid the steel strand through holes and connect the wind turbine foundation through bolting parts, thereby improving the overall structural rigidity, and the concrete tower is firmly connected to the wind turbine foundation, effectively ensuring the stability and reliability of the connection between the wind turbine foundation and the concrete tower, and meeting the development requirements of large-scale and high-altitude wind turbines.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a concrete tower connection device and a wind turbine support structure. Background Art

[0002] Offshore wind power is an important area of ​​renewable energy development. The wind turbine support structure is a wind turbine generator set, which mainly includes a tower, a wind turbine generator set on the top of the tower, and a wind turbine foundation used to support the tower. Among them, the concrete tower has the advantages of high rigidity, waterproof and corrosion resistance, and low cost, which can significantly improve the durability of the tower structure, thereby ensuring the safe and reliable operation of large offshore wind turbines.

[0003] In related technologies, concrete towers are mostly connected to wind turbine foundations through prestressed steel strands to improve the tensile performance of the entire tower. This forms a stiffness mutation area at the connection between the tower and the wind turbine foundation, which makes the stress concentration problem prominent and becomes a weak link in the overall structure. Summary of the invention

[0004] In view of this, the present invention provides a concrete tower connection device and a fan support structure to solve the stress concentration problem caused when the concrete tower is connected to the fan foundation through a steel strand in the prior art.

[0005] The present invention provides a concrete tower connection device, which is suitable for connecting a concrete tower to a wind turbine foundation. The concrete tower is provided with a steel strand. The concrete tower connection device includes a platform, the platform is provided with a through hole, and the platform is provided with a plurality of steel strand through holes and a plurality of first bolt holes around the through hole. The steel strand through holes are penetrated with the steel strand to connect the concrete tower, and the first bolt holes are penetrated with bolting parts to connect the wind turbine foundation.

[0006] As an optional implementation, an installation space is formed in the platform body, the installation space is communicated with the through hole, and the steel strand is fastened in the installation space.

[0007] As an optional embodiment, an installation cavity is formed in the platform body around the through hole, an inner bracket is provided in the installation cavity, and the installation space is formed between the bottom of the inner bracket and the bottom of the platform body, and the steel strand through-hole includes: a first through-hole, which is provided at the top of the platform body; a second through-hole, which is provided on the inner bracket; wherein the steel strand passes through the first through-hole and the second through-hole and enters the installation space for fastening.

[0008] As an optional implementation, the inner bracket is provided in plurality, and the plurality of inner brackets are provided in one-to-one correspondence with the plurality of steel strands.

[0009] As an optional embodiment, the platform includes: a cylinder; a first flange, arranged at one end of the cylinder, and the first through hole is arranged on the first flange; a second flange, arranged at the other end of the cylinder, and the installation cavity is formed between the second flange and the first flange; wherein the first flange and the second flange jointly form the through hole, the inner bracket is arranged on the inner wall of the cylinder, and the installation space is formed between the inner bracket and the second flange.

[0010] As an optional embodiment, the inner bracket includes: an inner support plate connected to the inner wall of the cylinder, and there is a gap between the inner support plate and the first flange; a rib plate assembly connecting the inner support plate and the first flange; and / or the rib plate assembly connecting the first flange and the second flange.

[0011] As an optional embodiment, the rib plate assembly includes: a first rib plate, one end of which is connected to the inner support plate, and the other end of the first rib plate is connected to the first flange; and / or a second rib plate, one end of which is connected to the first flange, the other end of the second rib plate is connected to the second flange, and the second rib plate is connected to the inner support plate.

[0012] As an optional implementation, the first bolting holes are arranged in two groups, and a plurality of the first bolting holes in each group are arranged in sequence to form an annular structure, and the inner diameters of the two annular structures are different.

[0013] The present invention also provides a wind turbine support structure, comprising: a concrete tower connection device as described in any one of the items; a concrete tower, provided with a steel strand, the steel strand being passed through the steel strand through-hole of the concrete tower connection device to connect the concrete tower connection device; a wind turbine foundation, the wind turbine foundation being a concrete structure, the wind turbine foundation having pre-embedded bolts, the bolts being passed through the first bolting holes of the concrete tower connection device; or the wind turbine foundation being a steel structure, the top of the wind turbine foundation being provided with a connecting plate, the connecting plate being provided with a second bolting hole, the bolts being passed through the first bolting holes and the second bolting holes.

[0014] As an optional embodiment, a first positioning structure is provided on the top of the platform of the concrete tower connection device, and a second positioning structure is provided on the bottom of the concrete tower, and the first positioning structure and the second positioning structure are matched in a concave-convex manner; and / or the platform is a cylindrical structure, the inner diameter of the top surface of the platform is smaller than the inner diameter of the bottom surface of the concrete tower, and the outer diameter of the platform is larger than the outer diameter of the bottom surface of the concrete tower.

[0015] The beneficial effects are as follows: the steel strands pass through the steel strand holes of the platform, thereby fastening the steel strands to the platform, realizing the connection between the concrete tower and the concrete tower connection device through the steel strands, and the bolting member passes through the first bolting hole to connect the wind turbine foundation, so that the concrete tower connection device can be connected to the wind turbine foundation. The steel strands can press the concrete tower tightly against the top of the concrete tower connection device, thereby improving the overall structural rigidity, and the concrete tower is firmly connected to the wind turbine foundation, with good force characteristics and convenient installation. It can realize a reasonable force transmission mechanism at the connection nodes of different rigidities and different media, adapt to different foundation forms, and realize the tensioning of the bottom steel strands, effectively ensuring the stability and reliability of the connection between the wind turbine foundation and the concrete tower, and can meet the development requirements of large-scale and high-altitude wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the top view of the concrete tower connection device according to an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of a concrete tower connection device according to an embodiment of the present invention;

[0019] Figure 3 It is a bottom view structural schematic diagram of a concrete tower tube connection device according to an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the three-dimensional structure of a fan support structure according to an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of a top view of a fan support structure according to an embodiment of the present invention;

[0022] Figure 6 for Figure 5 AOC cross-sectional structural diagram;

[0023] Figure 7 It is a schematic diagram of a three-dimensional structure of a bolted part of a wind turbine support structure connected to a concrete tower connection device and a concrete sleeve according to an embodiment of the present invention;

[0024] Figure 8 It is a schematic diagram of an enlarged structure of a partial cross-section of a bolted member of a fan support structure according to an embodiment of the present invention being connected on a first flange;

[0025] Fig. 9 A schematic cross-sectional view of a fan support structure according to another embodiment of the present invention;

[0026] Fig.10 It is a schematic cross-sectional structural diagram of a partial structure of a fan support structure according to another embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 10. Wind turbine support structure; 100. Concrete tower connection device; 110. Platform; 111. Cylinder; 112. First flange; 113. Second flange; 101. Through hole; 102. Steel strand through hole; 1021. First through hole; 1022. Second through hole; 103. First bolting hole; 104. Installation space; 105. Installation cavity: 106. First positioning structure; 120. Inner bracket; 121. Inner support plate; 122. Rib plate assembly; 1221. First rib plate; 1222. Second rib plate; 200. Concrete tower; 210. Steel strand; 300. Wind turbine foundation; 310. Connecting plate; 400. Bolt; 410. Anchor bolt; 420. Anchor bolt sleeve; 430. Protective cap; 500. Anchor plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0034] like Figure 1 and Figure 4 As shown, according to an embodiment of the present invention, a concrete tower connection device 100 is provided, which is suitable for connecting a concrete tower 200 to a wind turbine foundation 300. The concrete tower 200 is provided with a steel strand 210. The concrete tower connection device 100 includes a platform 110. The platform 110 is provided with a through hole 101. The platform 110 is provided with a plurality of steel strand through holes 102 and a plurality of first bolt holes 103 around the through hole 101. The steel strand through holes 102 are penetrated with steel strands 210 to connect the concrete tower 200. The first bolt holes 103 are penetrated with bolting members 400 to connect the wind turbine foundation 300.

[0035] The concrete tower 200 may be a cylindrical structure, and a plurality of steel strands 210 are arranged around the inner wall of the concrete tower 200, and the plurality of steel strands 210 are evenly distributed. The steel strands 210 extend along the inner wall of the concrete tower 200 in the length direction of the concrete tower 200 to the platform 110, and pass through the steel strand through hole 102 of the platform 110, thereby fastening the steel strands 210 to the platform 110, and realizing the connection between the concrete tower 200 and the concrete tower connection device 100 through the steel strands 210. The bolting member 400 is provided with a first bolting hole 103 to connect the wind turbine foundation 300, thereby connecting the concrete tower connection device 100 to the wind turbine foundation 300. The steel strand 210 can press the concrete tower 200 against the top of the concrete tower connecting device 100. The concrete tower 200 and the wind turbine foundation 300 are firmly connected, have good force characteristics, and are easy to install. A reasonable force transmission mechanism can be achieved at connection nodes with different stiffness and different media, effectively ensuring the stability and reliability of the connection between the wind turbine foundation 300 and the concrete tower 200, and meeting the development requirements of large-scale and high-altitude wind turbines.

[0036] In another embodiment, Figure 2 and Figure 6 As shown, an installation space 104 is formed in the platform 110 , the installation space 104 is communicated with the through hole 101 , and the steel strand 210 is fastened in the installation space 104 .

[0037] In this embodiment, the installation space 104 is provided corresponding to the steel strand 210, or in other words, the installation space 104 is provided corresponding to the steel strand through hole 102. The installation space 104 is a construction operation space for the prestressed steel strand 210. Operations such as tensioning, anchoring, and operation and maintenance of the steel strand 210 can be performed at the bottom of the concrete tower 200, thereby avoiding high-altitude operations caused by top tensioning and effectively improving construction efficiency.

[0038] In another embodiment, Figure 2 As shown, an installation cavity 105 is formed in the platform 110 around the through hole 101, and an inner bracket 120 is provided in the installation cavity 105. An installation space 104 is formed between the bottom of the inner bracket 120 and the bottom of the platform 110. The steel strand through hole 102 includes a first through hole 1021 and a second through hole 1022. The first through hole 1021 is provided at the top of the platform 110; the second through hole 1022 is provided on the inner bracket 120, wherein the steel strand 210 passes through the first through hole 1021 and the second through hole 1022 and enters the installation space 104 for fastening.

[0039] In this embodiment, the installation cavity 105 is an annular cavity surrounding the through hole 101, and the inner bracket 120 is arranged in the installation cavity 105. Space is formed between the inner bracket 120 and the top of the platform 110, and between the inner bracket 120 and the bottom of the platform 110. The space formed between the inner bracket 120 and the bottom of the platform 110 is the installation space 104. The first through hole 1021 and the second through hole 1022 are spaced apart from each other and arranged opposite to each other. The steel strand 210 passes through the first through hole 1021 and the second through hole 1022. The steel strand 210 is fastened under the inner bracket 120 for easy operation and is not repeated here.

[0040] The inner bracket 120 can be provided as a whole, or a plurality of inner brackets 120 can be provided, and the plurality of inner brackets 120 are provided in a one-to-one correspondence with the plurality of steel strands 210, which further simplifies the structural design.

[0041] In another embodiment, Figure 2As shown, the platform 110 includes a cylinder 111, a first flange 112 and a second flange 113. The first flange 112 is arranged at one end of the cylinder 111, and the first through hole 1021 is arranged on the first flange 112; the second flange 113 is arranged at the other end of the cylinder 111, and an installation cavity 105 is formed between the second flange 113 and the first flange 112; wherein the first flange 112 and the second flange 113 jointly form a through hole 101, and the inner bracket 120 is arranged on the inner wall of the cylinder 111, and an installation space 104 is formed between the inner bracket 120 and the second flange 113.

[0042] In this embodiment, the cylinder 111 is cylindrical, the first flange 112 and the second flange 113 are respectively annular structures, the first flange 112 is welded to the upper end of the inner wall of the cylinder 111, and the second flange 113 is welded to the lower end of the inner wall of the cylinder 111. The first flange 112 is annularly provided with a first through hole 1021 corresponding to the steel strand 210. Figure 3 As shown, the second flange 113 is circumferentially provided with a second through hole 1022 corresponding to the steel strand 210. The first bolt hole 103 includes a first bolt hole and a second bolt hole. The first bolt hole is provided on the first flange 112, and a plurality of first bolt holes surround the through hole 101 to form an annular structure, and the first bolt hole avoids the first through hole 1021. The second bolt hole is provided on the second flange 113, and the first bolt hole is opposite to the second bolt hole. A plurality of second bolt holes surround the through hole 101 to form an annular structure, and the second bolt hole avoids the second through hole 1022.

[0043] In this embodiment, a plurality of steel strand through holes 102 are provided, for example, the steel strand through holes 102 may be provided as 8, a group of first bolting holes 103 is provided between two adjacent steel strand through holes 102, and each group of first bolting holes 103 is further divided into a plurality of groups, for example, each group includes three first bolting holes 103. The first bolting holes of the first flange 112 are arranged in groups between every two first through holes 1021, and the second bolting holes of the second flange 113 are arranged in groups between every two second through holes 1022.

[0044] The cylinder 111 can connect the first flange 112 and the second flange 113 , and can protect the bolting component 400 and the steel strand 210 , thereby preventing the bolting component 400 and the steel strand 210 from being exposed to the outside.

[0045] The platform 110 is formed by connecting the first flange 112, the second flange 113 and the cylinder 111, and a steel structure can be used. Compared with the platform 110 of a solid structure, it is lighter, easier to install, and has a structural strength that can meet the use requirements.

[0046] In another embodiment, Figure 2As shown, the inner bracket 120 includes an inner support plate 121 and a rib plate assembly 122. The inner support plate 121 is connected to the inner wall of the cylinder 111. There is a gap between the inner support plate 121 and the first flange 112. The rib plate assembly 122 connects the inner support plate 121 and the first flange 112; and / or the rib plate assembly 122 connects the first flange 112 and the second flange 113.

[0047] In this embodiment, the inner support plate 121 is in a fan-shaped ring shape, and is arranged between the first flange 112 and the second flange 113. The inner support plate 121 is welded to the inner wall of the cylinder 111. The multiple inner support plates 121 are spaced from each other in sequence and are arranged in an annular direction in the installation cavity 105. The inner support plate 121 is provided with a steel strand through hole 102 corresponding to the steel strand 210. An installation space 104 is formed between the inner support plate 121 and the second flange 113, so that the installation space 104 can be entered from the through hole 101 to fasten and install the steel strand 210. Among them, the steel strand 210 passes through the first through hole 1021 and the second through hole 1022 and is anchored on the lower surface of the inner support plate 121. By tensioning the steel strand 210, the contact surface between the concrete tower connection device 100 and the concrete tower 200 can be always in a compressed state, which can greatly improve the bending and overturning resistance of the concrete tower 200.

[0048] In another embodiment, Figure 2 As shown, the rib assembly 122 includes a second rib 1222 , one end of the second rib 1222 is connected to the first flange 112 , the other end of the second rib 1222 is connected to the second flange 113 , and the second rib 1222 is connected to the inner support plate 121 .

[0049] In this embodiment, a second rib plate 1222 is respectively provided on the opposite sides of the inner support plate 121, which can increase the structural strength of the inner support plate 121 and make the connection structure of the inner support plate 121 more stable. The second rib plate 1222 can be welded to the inner support plate 121, the first flange 112 and the second flange 113.

[0050] The rib assembly 122 may further include a first rib 1221, one end of the first rib 1221 being connected to the inner support plate 121, and the other end of the first rib 1221 being connected to the first flange 112. Two first ribs 1221 may be provided, and a first rib 1221 is provided on opposite sides of each second through hole 1022, respectively, so as to increase the structural rigidity of the inner support plate 121 and make the structure of the inner support plate 121 more stable.

[0051] In another embodiment, Figure 2 and Figure 5As shown, the first bolting holes 103 are arranged in two groups, and a plurality of first bolting holes 103 in each group are arranged in sequence to form an annular structure, and the inner diameters of the two annular structures are different.

[0052] According to an embodiment of the present invention, as shown in the figure, a wind turbine support structure 10 is also provided, including any one of the concrete tower connection device 100, the concrete tower 200 and the wind turbine foundation 300, the concrete tower 200 is provided with a steel strand 210, the steel strand 210 is passed through the steel strand through hole 102 of the concrete tower connection device 100 to connect the concrete tower connection device 100, the wind turbine foundation 300 is a concrete structure, the wind turbine foundation 300 has a pre-embedded bolt 400, and the bolt 400 is passed through the first bolt hole 103 of the concrete tower connection device 100; or the wind turbine foundation 300 is a steel structure, the top of the wind turbine foundation 300 is provided with a connecting plate 310, the connecting plate 310 is provided with a second bolt hole, and the bolt 400 is passed through the first bolt hole 103 and the second bolt hole.

[0053] The concrete tower connection device 100 can adopt different connection methods according to the type of the lower wind turbine foundation 300. The lower part of the anchor bolt 410 can be pre-embedded in the concrete foundation or fixed to the top platform of the steel foundation by bolts, thereby realizing a stable connection between the prestressed concrete tower 200 and various types of wind turbine foundations 300.

[0054] If a concrete foundation pedestal is used at the bottom, since the lower anchor end of the steel strand 210 is located on the inner support plate 121, the foundation pedestal does not need to reserve a cavity for prestressing. The pedestal type is simple, the construction is convenient, and the demoulding time is short, which can effectively improve the construction efficiency of the wind turbine foundation 300.

[0055] In this embodiment, the cylinder 111 is a cylindrical steel plate, the outer diameter of the cylinder 111 is 12m, the thickness of the cylinder 111 is 50mm, the total height is 2.5m, the first flange 112 and the second flange 113 are respectively circular rings with inner diameters of 8m, the wall thickness of the first flange 112 is 90mm, and the wall thickness of the second flange 113 is 110mm.

[0056] The first flange 112 is provided with 8 first through holes 1021 corresponding to the steel strands 210 in the circumferential direction, and 144 first bolt holes corresponding to the two circles of bolting parts 400 in the circumferential direction. The second flange 113 is provided with 144 second bolt holes corresponding to the two circles of bolting parts 400 in the circumferential direction. The inner support plate 121 is fan-shaped and has 8 pieces in total. The upper surface of the inner support plate 121 is 0.8m away from the lower surface of the first flange 112, and the upper surface of the inner support plate 121 is 1.4m away from the upper surface of the second flange 113. The wall thickness of the inner support plate 121 is 100mm, and the inner diameter is 8m. The inner support plate 121 is provided with 8 second through holes 1022 corresponding to the steel strands 210.

[0057] The first ribs 1221 are short ribs, arranged in pairs on opposite sides of the second through hole 1022, with a total of 8 groups, 2 in each group. The first ribs 1221 are 50 mm thick, 0.8 m high, and 2 m wide. The upper end of the first ribs 1221 is welded to the lower surface of the first flange 112, the outer side of the first ribs 1221 is welded to the inner wall of the cylinder 111, and the lower end of the first ribs 1221 is welded to the upper surface of the inner support plate 121, which can effectively alleviate the problem of excessive local pressure of the concrete tower connection device 100 caused by the tensioning of the steel strands 210.

[0058] The second rib plate 1222 is a long rib plate. The second rib plate 1222 is arranged between two adjacent groups of first rib plates 1221, with a total of 8 groups, 4 in each group. The thickness of the second rib plate 1222 is greater than that of the first rib plate 1221. The thickness of the second rib plate 1222 is 60 mm, the height is 2.3 m, and the width is 2 m. The upper end of the second rib plate 1222 is welded to the lower surface of the first flange 112, the outer side of the second rib plate 1222 is welded to the inner wall of the cylinder 111, and the lower end of the second rib plate 1222 is welded to the upper surface of the second flange 113, which can enhance the compressive performance of the connecting device and improve the rigidity of the overall structure.

[0059] Therefore, setting a second rib plate 1222 between the first flange 112 and the second flange 113 can effectively enhance the overall compressive performance of the connection structure, improve the rigidity of the connection device, and help solve the problems of insufficient compressive bearing capacity and excessive deformation of the structure caused by the excessive deadweight of the upper concrete tower 200.

[0060] Both ends of the inner support plate 121 are respectively welded to the second rib plate 1222 on one side close to the first rib plate 1221. The lower surface of the inner support plate 121 is 1.4 m away from the upper surface of the second flange 113, meeting the operating space requirements for tensioning the prestressed steel strand 210 at the bottom of the tower.

[0061] The steel strand through holes 102 are evenly arranged on the first flange 112 and the inner support plate 121, the diameter of the holes is 200 mm, and the horizontal distance between the pitch circle of the steel strand through holes 102 and the center of the cylinder 111 is 9.8 m.

[0062] The first bolting holes 103 are provided in two circles, inner and outer, and are arranged in groups between every two steel strand through holes 102. The diameter of the first bolting holes 103 is 50 mm, and the horizontal distance between the pitch circle of the first bolting holes 103 in the outer circle and the center of the cylinder 111 is 11 m. The horizontal distance between the pitch circle of the first bolting holes 103 in the inner circle and the center of the cylinder 111 is 9 m.

[0063] like Figure 5As shown, the bolt connectors 400 are arranged in two circles, inner and outer, so that the concrete sleeve is located in the gap between the two circles of bolt connectors 400. The inner circle of bolt connectors 400 and the outer circle of bolt connectors 400 can cooperate to form a limit for the concrete sleeve.

[0064] In another embodiment, a first positioning structure 106 is disposed on the top of the platform 110 of the concrete tower connection device 100, and a second positioning structure is disposed on the bottom of the concrete tower 200, and the first positioning structure 106 and the second positioning structure are matched in a concave-convex manner.

[0065] To ensure accurate positioning of the concrete tower 200 and the concrete tower connecting device 100, as Figure 2 As shown, the first flange 112 is symmetrically provided with four first positioning structures 106, the first positioning structure 106 includes a first positioning hole and a positioning member, the positioning member is inserted into the first positioning hole, the diameter of the first positioning hole is 40 mm, the depth is 60 mm, and the horizontal distance between the pitch circle of the first positioning hole and the center of the cylinder 111 is 10.4 m. The second positioning structure is a second positioning hole, and before the concrete tower 200 is hoisted, the positioning member is inserted into the first positioning hole, and the bottom surface of the concrete tower 200 is reserved with a second positioning hole corresponding to the first positioning hole set on the top surface of the platform 110, so as to facilitate the precise positioning of the concrete tower 200.

[0066] The platform 110 is a cylindrical structure. The inner diameter of the top surface of the platform 110 is smaller than the inner diameter of the bottom surface of the concrete tower 200 , and the outer diameter of the platform 110 is larger than the outer diameter of the bottom surface of the concrete tower 200 .

[0067] The edge of the top of the platform 110 extends beyond the edge of the bottom of the concrete tower 200, so that the projection of the bottom surface of the concrete tower 200 on the top surface of the platform 110 completely falls into the top surface of the platform 110, which can ensure that the bottom surface of the concrete tower 200 is completely placed on the upper surface of the first flange 112, thereby achieving the purpose of optimizing the force transmission path of the tower bottom load to the wind turbine foundation 300 and uniformly diffusing the stress.

[0068] Embodiment 1, as Figure 6 and Figure 7 As shown, the wind turbine foundation 300 adopts a concrete foundation, and the specific construction process is as follows:

[0069] S1: Before pouring the fan foundation 300, if Figure 7 and Figure 8 As shown, the anchor bolt 410 is inserted into the anchor bolt sleeve 420 to form a bolt connection 400. The lower end of the bolt connection 400 is fixed on the anchor plate 500 arranged inside the wind turbine foundation 300. The upper end of the bolt connection 400 is exposed about 2.5m from the top surface of the wind turbine foundation 300. Subsequently, the concrete of the wind turbine foundation 300 is poured.

[0070] S2: After the concrete of the wind turbine foundation 300 is cured to a certain strength, the concrete tower connection device 100 is hoisted to the top surface of the wind turbine foundation 300, and the anchor bolt 410 passes through the bolting holes of the second flange 113 and the first flange 112 of the connection device. The upper end of the anchor bolt 410 is fixed to the upper surface of the first flange 112 by a nut, and an anti-corrosion cap 430 is provided to prevent the end of the anchor bolt 410 from being exposed to corrosion and other problems in the humid environment at sea for a long time. Then, waterproof sealant is applied to the connection between the second flange 113 and the top surface of the concrete foundation.

[0071] S3: Before hoisting the concrete tower 200, a positioning piece is inserted into the first positioning hole. The positioning piece is a threaded sleeve. The second positioning hole on the bottom surface of the concrete tower 200 is plugged into the positioning piece in a concave-convex manner to facilitate the precise positioning of the concrete tower 200. Then, positioning pins are inserted into the four positioning pieces on the top surface of the connecting device. The positioning pins are generally three long and one short.

[0072] S4: The concrete tower 200 is hoisted, and the first section of the concrete tower 200 is hoisted to the surface of the first flange 112 of the connecting device, and positioned by positioning pins. Since the outer diameter of the first flange 112 is larger than the outer diameter of the bottom surface of the concrete tower 200, and the inner diameter of the first flange 112 is smaller than the inner diameter of the bottom surface of the concrete tower 200, it can be ensured that the bottom surface of the concrete tower 200 completely overlaps with the upper surface of the first flange 112, so as to optimize the force transmission path of the tower bottom load to the wind turbine foundation 300 and evenly diffuse the stress, and then apply waterproof sealant to the connection between the first flange 112 and the bottom surface of the concrete tower 200.

[0073] S5: After the concrete tower 17 is hoisted, the steel strand 210 passes through the first flange 112 and the steel strand through hole 102 of the inner support plate 121, and is anchored on the lower surface of the inner support plate 121. The prestressed steel strand 210 is tensioned at the lower part of the inner support plate 121, so that the contact surface between the connecting device and the concrete tower 200 is always under pressure, thereby greatly improving the bending and overturning resistance of the concrete tower 200. When the steel strand 210 is tensioned, the construction personnel can enter through the tower door of the concrete tower 200, and enter the installation space 104 below the inner support plate 121 of the connecting device through the built-in ladder for tensioning. The upper end of the steel strand 210 is anchored at the top of the concrete tower 200, which will not be repeated here.

[0074] Embodiment 2, as Fig. 9 and Fig.10 As shown, the wind turbine foundation 300 is a steel foundation. The difference from Example 1 is that the foundation type of the lower connection of the connecting device is different. In Example 2, the lower part adopts a steel foundation, and the anchor bolt 410 passes through the connecting plate 310 set on the top of the steel foundation and is fixed to the lower surface of the connecting plate 310 of the wind turbine foundation 300 by a nut.

[0075] Waterproof sealant is applied to the connection between the first flange 112 and the bottom surface of the concrete tower 200 , and the second flange 113 and the top surface of the wind turbine foundation 300 .

[0076] The present invention proposes a connection structure between a prestressed concrete tower 200 and a wind turbine foundation 300, which has a reasonable structure, precise docking, firm connection, good force characteristics, and convenient installation. It can realize a reasonable force transmission mechanism at connection nodes with different stiffness and different media, effectively ensure the stability and reliability of the connection between the foundation and the tower, and can meet the development requirements of large-scale and high-altitude wind turbines.

[0077] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection created by this application.

Claims

1. A concrete tower connection device, suitable for connecting a concrete tower (200) to a wind turbine foundation (300), wherein the concrete tower (200) is provided with a steel strand (210), characterized in that: The concrete tower connection device (100) comprises a platform (110), the platform (110) being provided with a through hole (101), the platform (110) being provided with a plurality of steel strand through holes (102) and a plurality of first bolt holes (103) surrounding the through hole (101), the steel strand through holes (102) being passed through with the steel strand (210) to connect to the concrete tower (200), and the first bolt holes (103) being passed through with bolting members (400) to connect to the wind turbine foundation (300); An installation space (104) is formed in the platform (110), the installation space (104) is connected to the through hole (101), and the steel strand (210) is fastened in the installation space (104); An installation cavity (105) is formed in the platform (110) around the through hole (101), an inner bracket (120) is arranged in the installation cavity (105), and the installation space (104) is formed between the bottom of the inner bracket (120) and the bottom of the platform (110), and the steel strand through hole (102) comprises: A first through hole (1021) is provided on the top of the platform (110); A second through hole (1022) is provided on the inner bracket (120); The steel strand (210) passes through the first through hole (1021) and the second through hole (1022) and enters the installation space (104) for fastening; The inner bracket (120) is provided in plurality, and the plurality of inner brackets (120) are provided in one-to-one correspondence with the plurality of steel strands (210); The platform (110) comprises: Cylinder (111); A first flange (112) is provided at one end of the cylinder (111), and the first through hole (1021) is provided on the first flange (112); a second flange (113) disposed at the other end of the cylinder (111), wherein the installation cavity (105) is formed between the second flange (113) and the first flange (112); The first flange (112) and the second flange (113) together form the through hole (101); the inner bracket (120) is arranged on the inner wall of the cylinder (111); and the installation space (104) is formed between the inner bracket (120) and the second flange (113); The inner support (120) comprises: An inner support plate (121) connected to the inner wall of the cylinder (111), with a gap existing between the inner support plate (121) and the first flange (112); a rib plate assembly (122) connecting the inner support plate (121) and the first flange (112); the rib plate assembly (122) connecting the first flange (112) and the second flange (113); The rib plate assembly (122) comprises: A first rib plate (1221), one end of which is connected to the inner support plate (121), and the other end of the first rib plate (1221) is connected to the first flange (112); a second rib plate (1222), one end of which is connected to the first flange (112), the other end of which is connected to the second flange (113), and the second rib plate (1222) is connected to the inner support plate (121); The first bolting holes (103) are arranged in two groups, and a plurality of the first bolting holes (103) in each group are arranged in sequence to form an annular structure, and the inner diameters of the two annular structures are different; The bolting members (400) are arranged in two circles, inner and outer, and correspond to two groups of the first bolting holes (103) respectively, and the concrete tower barrel (200) is located in the gap between the two circles of the bolting members (400).

2. A fan support structure, characterized in that: include: The concrete tower connection device (100) according to claim 1; A concrete tower (200) is provided with a steel strand (210), wherein the steel strand (210) is passed through a steel strand through hole (102) of the concrete tower connection device (100) to connect to the concrete tower connection device (100); A wind turbine foundation (300), wherein the wind turbine foundation (300) is a concrete structure, a bolting member (400) is pre-embedded in the wind turbine foundation (300), and the bolting member (400) is inserted through a first bolting hole (103) of the concrete tower connection device (100); or the wind turbine foundation (300) is a steel structure, a connecting plate (310) is provided on the top of the wind turbine foundation (300), a second bolting hole is provided on the connecting plate (310), and the bolting member (400) is inserted through the first bolting hole (103) and the second bolting hole.

3. The fan support structure according to claim 2, characterized in that: A first positioning structure (106) is provided on the top of the platform (110) of the concrete tower connection device (100), and a second positioning structure is provided on the bottom of the concrete tower (200), wherein the first positioning structure (106) and the second positioning structure are matched in a concave-convex manner; And / or, the platform (110) is a cylindrical structure, the inner diameter of the top surface of the platform (110) is smaller than the inner diameter of the bottom surface of the concrete tower (200), and the outer diameter of the platform (110) is larger than the outer diameter of the bottom surface of the concrete tower (200).

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