Novel fan transition section structure and construction method thereof

Abstract

The invention discloses a novel draught fan transition section structure and a construction method thereof. The novel draught fan transition section structure comprises a center tower drum and at least three chord members arranged on the outer side of the center tower drum. An upper box girder plate group, a lower box girder plate group, an upper box girder web plate and a lower box girder web plate are arranged between the central tower drum and the chord member; two ends of the upper box girder plate group are respectively connected with the central tower drum and the chord member; two ends of the lower box girder plate group are respectively connected with the central tower drum and the chord member; a first included angle is formed between the upper box girder plate group and the lower box girder plate group; two ends of the upper and lower box girder webs are respectively connected with the central tower drum and the chord member, and one side of each of the upper and lower box girder webs is simultaneously attached to the side surface of the upper box girder plate group and the side surface of the lower box girder plate group. By arranging the upper box girder plate group, the lower box girder plate group and the upper and lower box girder webs, the bending rigidity and torsional rigidity of the box girder group are ensured; meanwhile, the transition section is small in overall structural part number, machining is convenient, and the work amount is reduced.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, and in particular to a novel wind turbine transition section structure and its construction method. Background Technology

[0002] As the demand for grid parity in the wind power industry increases and development areas expand from nearshore to deep-sea areas, the cost of offshore wind power equipment is gradually rising. To address the cost issue, increasing the capacity of a single wind turbine is the most direct method, and increasing the turbine capacity directly leads to an increase in the swept area of ​​the turbine blades.

[0003] However, increasing the swept area brings with it an increased load on the fan and a greater complexity of that load. Simply scaling up the existing structural dimensions proportionally would not only pose safety risks but also lead to a surge in the amount of engineering work required. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a novel wind turbine transition section structure and its construction method, which improves the safety of the transition section structure while reducing the amount of engineering work.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A novel wind turbine transition section structure includes a central tower and at least three chord members disposed on the outer side of the central tower. An upper box girder assembly, a lower box girder assembly, and upper and lower box girder webs are disposed between the central tower and the chord members. Both ends of the upper box girder assembly are connected to the central tower and the chord members, respectively. Both ends of the lower box girder assembly are connected to the central tower and the chord members, respectively. A first included angle is formed between the upper and lower box girder webs. Both ends of the upper and lower box girder webs are connected to the central tower and the chord members, respectively, and one side of each upper and lower box girder web simultaneously abuts against the side of both the upper and lower box girder assembly.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A construction method for a novel wind turbine transition section structure, applied to the aforementioned novel wind turbine transition section structure, includes: Connect the lower box girder slab assembly to the chord members; Connect the web plates of the upper and lower box girders to the chords and the lower box girder plate assembly; Connect the lower box girder slab assembly and the webs of the upper and lower box girders to the central tower. Connect the upper box girder plate assembly to the central tower, chord, and webs of the upper and lower box girders.

[0007] The beneficial effects of this invention are as follows: by connecting the central tower and the chord with the upper box girder plate assembly, the lower box girder plate assembly, and the webs of the upper and lower box girders, and by setting the upper and lower box girder plate assemblies at different angles, the connection strength between the central tower and the chord is improved in different directions. Furthermore, by connecting the webs of the upper and lower box girders to the central tower, the chord, the upper box girder plate assembly, and the lower box girder plate assembly respectively, the overall connection strength of the transition section structure is improved. The arrangement of the upper box girder plate assembly, the lower box girder plate assembly, and the webs of the upper and lower box girders ensures the bending stiffness and torsional stiffness of the box girder assembly. At the same time, the overall structural components of the transition section are fewer in number, which facilitates processing and reduces the amount of engineering work. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the main structure of a novel wind turbine transition section structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a box girder structure for a novel wind turbine transition section in an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of a novel wind turbine transition section in an embodiment of the present invention; Figure 4 This is a top view of a novel wind turbine transition section structure after the outer platform is hidden, according to an embodiment of the present invention. Figure 5 for Figure 4 Enlarged view of the structure marked as part A in the middle; Figure 6 for Figure 3 Enlarged view of the structure marked as part B; Figure 7 This is a bottom view of the overall structure of a novel wind turbine transition section structure according to an embodiment of the present invention; Label Explanation: 1. Central tower section; 11. Lower tower section; 12. Middle tower section; 13. Upper tower section; 14. Flange; 15. Tower portal; 16. Cable conduit; 2. Chord member; 3. Upper box girder slab assembly; 31. Upper box girder top slab; 311. First sub-top slab; 312. Second sub-top slab; 313. Third sub-top slab; 32. Upper box girder bottom slab; 4. Lower box girder slab assembly; 41. Lower box girder top slab; 42. Lower box girder bottom slab; 421. First sub-bottom slab; 422. Second sub-bottom slab; 423. Third sub-bottom slab; 43. Circular hole; 5. Web plates of upper and lower box girders; 6. External platform; 61. L-shaped reinforcing beam; 62. T-shaped reinforcing beam; 63. C-shaped reinforcing beam; 64. Support plate; 65. Perforated support plate; 7. Lifting lug; 8. Crane support assembly; 81. Crane support pipe; 82. Crane support plate; 83. Crane support tube; 84. Crane support top plate; 85. Crane support rib plate. Detailed Implementation

[0009] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0010] As the demand for grid parity in the wind power industry increases and development areas expand from nearshore to deep-sea areas, the cost of offshore wind power equipment is gradually rising. To address this cost issue, increasing the capacity of a single wind turbine is the most direct method, which directly leads to an increase in the swept area of ​​the turbine blades. However, increasing the swept area also brings the problem of increased turbine load and load complexity.

[0011] Currently, the mainstream wind turbine units on the market have capacities ranging from 13MW to 18MW. To mitigate the negative impact of long distances and deep waters in deep-sea environments on investment costs, the research and development and mass application of larger capacity units have become a key focus for the industry. However, the design of mainstream jacket foundation wind turbines, especially their transition section structures (such as inclined box girder and flat box girder schemes), is still primarily designed for 13-18MW units. Simply scaling up the existing structural dimensions proportionally could not only pose safety hazards but also lead to a surge in engineering workload. Therefore, there is an urgent need to develop more efficient new transition section structural solutions.

[0012] To address the aforementioned technical problems, this invention provides a novel wind turbine transition section structure and its construction method, which improves the safety of the transition section structure, increases the external platform space of the transition section structure, and improves the utilization rate of the external platform space, while reducing the amount of engineering work.

[0013] Please refer to Figure 1 A novel wind turbine transition section structure includes a central tower 1 and at least three chord members 2 disposed on the outer side of the central tower 1. The central tower 1 is formed by welding together a lower tower section 11, a middle tower section 12, and an upper tower section 13. An upper box girder plate assembly 3, a lower box girder plate assembly 4, and upper and lower box girder web plates 5 are disposed between the central tower 1 and the chord members 2. The two ends of the upper box girder plate assembly 3 are connected to the central tower 1 and the chord members 2, respectively. The two ends of the lower box girder plate assembly 4 are connected to the central tower 1 and the chord members 2, respectively. A first included angle is formed between the upper box girder plate assembly 3 and the lower box girder plate assembly 4. The two ends of the upper and lower box girder web plates 5 are connected to the central tower 1 and the chord members 2, respectively, and one side of the upper and lower box girder web plates 5 is simultaneously attached to the side of the upper box girder plate assembly 3 and the side of the lower box girder plate assembly 4.

[0014] As can be seen from the above description, the beneficial effects of the present invention are as follows: by connecting the central tower 1 and the chord 2 with the upper box girder plate assembly 3, the lower box girder plate assembly 4, and the upper and lower box girder web plates 5, and by setting the upper box girder plate assembly 3 and the lower box girder plate at different angles, the connection strength between the central tower 1 and the chord 2 is improved in different directions. Furthermore, by connecting the upper and lower box girder web plates 5 with the central tower 1, the chord 2, the upper box girder plate assembly 3, and the lower box girder plate assembly 4 respectively, the overall connection strength of the transition section structure is improved. The arrangement of the upper box girder plate assembly 3, the lower box girder plate assembly 4, and the upper and lower box girder web plates 5 ensures the bending stiffness and torsional stiffness of the box girder assembly, thereby improving the safety of the transition section structure. At the same time, the overall structural components of the transition section are fewer in number, which facilitates processing and reduces the amount of engineering work.

[0015] Please refer to Figure 2 In one embodiment of this application, the upper box girder plate assembly 3 includes an upper box girder top plate 31 and an upper box girder bottom plate 32. The upper box girder bottom plate 32 and the lower box girder plate assembly 4 form a first included angle, and the upper box girder top plate 31 and the lower box girder plate assembly 4 form a second included angle. The lower box girder plate assembly 4 includes a lower box girder top plate 41 and a lower box girder bottom plate 42 arranged in parallel. The web plates 5 of the upper and lower box girders include an integrally formed inclined section and a horizontal section. The inclined section is connected to the upper box girder top plate 31 and the upper box girder bottom plate 32, and the horizontal section is connected to the lower box girder top plate 41 and the lower box girder bottom plate 42.

[0016] As described above, the upper box girder assembly 3 consists of an upper box girder top plate 31 and an upper box girder bottom plate 32, and the lower box girder assembly 4 consists of a lower box girder top plate 41 and a lower box girder bottom plate 42. The webs 5 of the upper and lower box girders are then placed on the sides, forming a hollow box girder structure. While ensuring the bending and torsional stiffness of the box girder, the hollow structure effectively reduces the weight of the box girder structure. Compared with the same design scheme for the transition section between inclined beams and flat box girders, the transition section structure in this embodiment has a lower weight, reduced by approximately 20%.

[0017] In one embodiment of this application, the beam width of the upper box girder assembly 3 gradually increases from the chord 2 to the central tower 1; the beam width of the lower box girder assembly 4 gradually increases from the chord 2 to the central tower 1; at the same time, the beam widths of the upper box girder assembly 3 and the lower box girder assembly 4 change synchronously.

[0018] As described above, by setting the beam width of the upper box girder slab group 3 and the lower box girder slab group 4 to gradually increase from the chord 2 to the central tower 1 and changing synchronously, the connection area between the upper box girder slab group 3 and the lower box girder slab group 4 and the central tower 1 is increased, thereby improving the connection strength with the central tower 1; and the synchronous change of the beam width of the upper box girder slab group 3 and the lower box girder slab group 4 makes the upper box girder slab group 3 and the lower box girder slab group 4 bear the force evenly.

[0019] In one embodiment of this application, the first included angle includes 30°-45°. Specifically, the first included angle is the angle between the center planes of the upper box girder assembly 3 and the lower box girder assembly 4.

[0020] As can be seen from the above description, by setting the first included angle to 30°-45°, the upper box girder slab group 3 can achieve the best support effect and maximize the supporting role of the upper box girder slab group 3.

[0021] Please refer to Figure 3 In one embodiment of this application, an outer platform 6 is provided between two adjacent chord members 2; the outer platform 6 is connected to the upper and lower box girder webs 5 on the two adjacent chord members 2, and is also connected to the central tower 1. The outer platform 6 may be a steel plate structure, and the top elevation of the outer platform 6 in the transition section is the same as the top elevation of the lower box girder top plate 41.

[0022] As can be seen from the above description, by setting the outer platform 6 to connect the space between the chord members 2, the structural connection strength is improved, and a space for people to walk between the chord members 2 is also provided, which facilitates the movement of workers.

[0023] In one embodiment of this application, each chord 2 is provided with at least two lugs 7; the included angle between the two lugs 7 on the same chord 2 is 120°-180°, and the lugs 7 are provided on the chord 2 section below the outer platform 6.

[0024] As described above, by setting up lifting lugs 7, it is convenient to tie cables before hoisting operations. At the same time, lifting lugs 7 can be arranged at the lower part of the outer platform 6, that is, the lifting lugs 7 are set above the bottom plate 42 of the lower box girder and below the outer platform 6, without occupying the space of the outer platform 6. While ensuring hoisting safety, it does not affect the personnel space of the upper platform, thus improving the utilization rate of the outer platform 6.

[0025] Please refer to Figure 4 as well as Figure 5 In one embodiment of this application, an L-shaped reinforcing beam 61, a T-shaped reinforcing beam 62, and a C-shaped reinforcing beam 63 are provided on the outer platform 6; the L-shaped reinforcing beam 61 is provided on the outer edge of the bottom of the outer platform 6; the T-shaped reinforcing beam 62 and the C-shaped reinforcing beam 63 are provided on the bottom of the outer platform 6, and the C-shaped reinforcing beam 63 is connected to the T-shaped reinforcing beam 62.

[0026] As described above, the structural strength of the outer platform 6 is enhanced by setting up L-shaped reinforcing beams 61, T-shaped reinforcing beams 62, and C-shaped reinforcing beams 63, and placing these beams of different structures in different locations. The L-shaped reinforcing beam 61 is located on the outermost side of the outer platform 6 and can later be used as a support for the railings of the transition section platform, providing a support point for the railings of the outer platform 6.

[0027] Please refer to Figure 4In one embodiment of this application, a support plate 64 or a perforated support plate 65 is provided at the position where the outer platform 6 connects to the chord 2. For example... Figure 4 As shown, the support plate 64 and the perforated support plate 65 are crescent-shaped and can be made of steel plate. There are two support plates 64 and two perforated support plates 65, which are arranged alternately.

[0028] As described above, by providing a support plate 64 or a perforated support plate 65 at the connection point between the outer platform 6 and the chord 2, the support plate 64 and the perforated support plate 65 not only provide standing space for construction personnel when tying cables, but can also be used as a walkway for the outer platform 6 after the hoisting work is completed. Simultaneously, the perforated support plate 65 also serves as a ladder for personnel to climb onto the lower guide frame.

[0029] Please refer to Figure 6 In one embodiment of this application, at least one chord member 2 is provided with a crane support assembly; the crane support assembly 8 includes a crane support tube 81, a crane support plate 82, a crane support tube 83, a crane support top plate 84, and a crane support rib 85; the crane support tube 81 is disposed on the chord member 2 and is coaxially disposed with the chord member 2; the crane support plate 82 is disposed at the end of the crane support tube 81 away from the chord member 2; one end of the crane support tube 83 is connected to the crane support plate 82, and the other end is connected to the crane support top plate 84; the crane support rib 85 is disposed between the crane support plate 82 and the crane support top plate 84, and is respectively connected to the crane support plate 82, the crane support top plate 84, and the crane support tube 83.

[0030] As described above, the crane support assembly 8 is composed of the crane support pipe 81, the crane support plate 82, the crane support support pipe 83, the crane support top plate 84, and the crane support rib plate 85. The crane support assembly 8 is set on the chord 2 as a whole, without occupying the space of the outer platform 6, thus improving the utilization rate of the outer platform 6. At the same time, the angle between the crane support pipe 81 and the chord 2 is consistent, which is beneficial to the transmission of crane load.

[0031] Another embodiment of the present invention provides a construction method for a novel wind turbine transition section structure, applicable to the construction of a novel wind turbine transition section structure as described above, the method comprising: Connect the lower box girder plate group 4 to the chord member 2; Connect the web plates 5 of the upper and lower box girders to the chord members 2 and the lower box girder plate assembly 4; Connect the lower box girder plate assembly 4 and the upper and lower box girder webs 5 to the central tower 1; Connect the upper box girder plate group 3 to the central tower 1, chord 2, and upper and lower box girder webs 5.

[0032] As described above, the lower box girder plate assembly 4 is first connected to the chord 2, and then connected to the upper and lower box girder webs 5. Next, the lower box girder plate assembly 4 and the upper and lower box girder webs 5 are connected to the central tower 1, and the upper box girder plate assembly 3 is connected to the central tower 1, the chord 2, and the upper and lower box girder webs 5. This increases the connection strength between the central tower 1 and the chord 2 in different directions, ensuring the bending and torsional stiffness of the box girder assembly and improving the safety of the transition section structure. Simultaneously, the transition section has fewer overall structural components, facilitating fabrication and reducing the workload.

[0033] The novel wind turbine transition section structure provided in this embodiment can be applied to the transition section structure of new wind turbines for large-capacity typhoon-resistant units, and can bear the load of 18-28MW typhoon-resistant units.

[0034] One embodiment of the present invention is as follows: Please refer to Figure 1 A novel wind turbine transition section structure includes a central tower 1 and at least three chord members 2 disposed on the outer side of the central tower 1; such as Figure 1 As shown, four chord members 2 are provided, and the four chord members 2 are evenly arranged on the outside of the central tower 1. The centerline of the chord member 2 has two angular settings: one is that it is collinear with the centerline of the lower jacket chord member 2, and the other is parallel to the vertical axis in the spatial coordinate system. A flange 14 is provided at the top of the central tower 1. The flange 14 can be a T-shaped flange or an L-shaped flange; in this embodiment, a T-shaped flange is used. Please refer to... Figure 7 The bottom of the central tower 1 is reinforced with a circular steel plate and a T-shaped steel beam. The bottom sealing plate has 16 holes for cable conduits, with 1-4 cable conduits in total; in this embodiment, 2 are provided. Simultaneously, a circular hole 43 is provided at the bottom of the lower box girder plate assembly 4, corresponding to the center of the chord 2. This circular hole 43 serves as an exhaust port and is used during the installation of the jacket frame. After the entire assembly is completed, the gas from the lower jacket frame can be discharged from the top through the exhaust port.

[0035] Between the central tower 1 and the chord 2, there are upper box girder slabs 3, lower box girder slabs 4, and upper and lower box girder webs 5. The two ends of the upper box girder slabs 3 are connected to the central tower 1 and the chord 2, respectively. The two ends of the lower box girder slabs 4 are connected to the central tower 1 and the chord 2, and the lower box girder slabs 4 are horizontally positioned. The upper box girder slabs 3 and the lower box girder slabs 4 form a first included angle, such as an angle of 30°-45° between their center planes. The two ends of the upper and lower box girder webs 5 are connected to the central tower 1 and the chord 2, respectively, and one side of each web simultaneously fits against the side of both the upper and lower box girder slabs 3 and the lower box girder slabs 4. Simultaneously, the beam width of the upper box girder slabs 3 gradually increases from the chord 2 to the central tower 1; the beam width of the lower box girder slabs 4 also gradually increases from the chord 2 to the central tower 1.

[0036] like Figure 2As shown, the upper box girder slab assembly 3 includes an upper box girder top slab 31 and an upper box girder bottom slab 32. The upper box girder bottom slab 32 forms a first included angle with the lower box girder slab assembly 4, and the upper box girder top slab 31 forms a second included angle with the lower box girder slab assembly 4. The lower box girder slab assembly 4 includes a lower box girder top slab 41 and a lower box girder bottom slab 42 arranged in parallel. The webs 5 of the upper and lower box girders include an integrally formed inclined section and a horizontal section. The inclined section is connected to the upper box girder top slab 31 and the upper box girder bottom slab 32, and the horizontal section is connected to the lower box girder top slab 41 and the lower box girder bottom slab 42. Figure 1 and 2 As shown, the webs 5 of the upper and lower box girders are shaped like an "∠", indicating that the webs 5 are an integral structure, and the connection between the webs 5 and the central tower 1 is achieved through an arc. The top plate 31 of the upper box girder consists of a first sub-top plate 311, a second sub-top plate 312, and a third sub-top plate 313, with the first sub-top plate 311 being a ring structure. The bottom plate 42 of the lower box girder consists of a first sub-bottom plate 421, a second sub-bottom plate 422, and a third sub-bottom plate 423, with the first sub-bottom plate 421 being a ring structure.

[0037] Please refer to Figure 3 An outer platform 6 is provided between two adjacent chord members 2. The outer platform 6 is connected to the upper and lower box girder webs 5 on the two adjacent chord members 2, and also to the central tower 1. The outer platform 6 can be a steel plate structure, and the top elevation of the outer platform 6 in the transition section is the same as the top elevation of the lower box girder top plate 41. A platform is also provided inside the central tower 1, and a tower portal 15 is provided. A reinforcing ring is provided along the tower portal 15, and the tower portal 15 is closed in the form of a tower door. A support plate 64 or a perforated support plate 65 is provided at the connection position between the outer platform 6 and the chord member 2, such as... Figure 4 As shown, the support plate 64 and the perforated support plate 65 are crescent-shaped and can be made of steel plate. There are two support plates 64 and two perforated support plates 65, which are arranged alternately. Each chord 2 is provided with at least two lifting lugs 7, which are located above the bottom plate 42 of the lower box girder and below the outer platform 6. The included angle between the two lifting lugs 7 on the same chord 2 is 120°-180°.

[0038] like Figure 4 and Figure 5 As shown, the outer platform 6 is provided with L-shaped reinforcing beams 61, T-shaped reinforcing beams 62, and C-shaped reinforcing beams 63; the L-shaped reinforcing beam 61 is located at the bottom edge of the outer platform 6; the T-shaped reinforcing beams 62 and C-shaped reinforcing beams 63 are located at the bottom of the outer platform 6, and the C-shaped reinforcing beam 63 is connected to the T-shaped reinforcing beam 62; as shown... Figure 4 As shown, a total of five C-shaped reinforcing beams 63 are connected to a single T-shaped reinforcing beam 62. Among them, the L-shaped reinforcing beam 61 is located on the outermost side of the outer platform 6 and can be used as a railing support for the transition section platform in the future, providing a support point for the railing of the outer platform 6.

[0039] Please refer to Figures 3 to 6 At least one chord 2 is provided with a crane support assembly; such as Figure 4 In this embodiment, a crane support assembly is provided. The crane support assembly is set on the chord 2 with a perforated support plate 65 and is close to the tower portal 15. The crane support assembly 8 includes a crane support tube 81, a crane support plate 82, a crane support tube 83, a crane support top plate 84, and a crane support rib plate 85. The crane support tube 81 is mounted on the chord 2 and is coaxial with the chord 2. The angle of the chord 2 is the same as or perpendicular to the horizontal plane of the crane support tube 81. The crane support plate 82 is located at the end of the crane support tube 81 away from the chord 2. One end of the crane support tube 83 is connected to the crane support plate 82, and the other end is connected to the crane support top plate 84. The crane support rib plate 85 is located between the crane support plate 82 and the crane support top plate 84, and is connected to the crane support plate 82, the crane support top plate 84, and the crane support tube 83, respectively.

[0040] Another embodiment of the present invention provides a construction method for a novel wind turbine transition section structure, applicable to the construction of the novel wind turbine transition section structure as described above, the method comprising: S0. Parts processing: Processing each part, cutting intersecting lines, and cutting steel profiles.

[0041] S1. Connect the lower box girder slab assembly 4 to the chord member 2, specifically: S11. Weld the first sub-base plate 421, the second sub-base plate 422 and the third sub-base plate 423 together to form the lower box girder base plate 42. After the lower box girder base plate 42 is supported as a whole, it is welded to the chord 2.

[0042] S2. Connect the web plates 5 of the upper and lower box girders to the chord members 2 and the lower box girder plate assembly 4.

[0043] S3. Connect the lower box girder plate assembly 4 and the upper and lower box girder webs 5 to the central tower 1, specifically: S31. Weld the lower box girder plate group 4 and the upper and lower box girder web plates 5 to the lower tower section 11. At the same time, weld the tower bottom sealing plate on the lower tower section 11 and add support at the bottom of the bottom sealing plate.

[0044] S32. Open a manhole on the top plate 41 of the lower box girder, weld the top plate 41 of the lower box girder, and then seal the manhole on the top plate 41 of the lower box girder. S33, welding outer platform 6, support plate 64 and perforated support plate 65; S34. Weld lifting lugs 7, and weld L-shaped reinforcing beams 61, T-shaped reinforcing beams 62, C-shaped reinforcing beams 63, wave protection steel pipes, and tower bottom sealing plate T-shaped reinforcing beams 62 on the outer platform 6. S35. Weld the middle tower section 12 and the upper tower section 13 together, and at the same time set the tower portal 15 and the reinforcing ring; S4. Connect the upper box girder plate assembly 3 to the central tower 1, chord 2, and upper and lower box girder webs 5, specifically: S41. Weld the bottom plate 32 of the upper box girder to the chord 2 and the upper tower section 13, and open a manhole on the top plate 31 of the upper box girder. S42. Weld the first sub-top plate 311, the second sub-top plate 312 and the third sub-top plate 313 to form the upper box girder top plate 31, and seal the lower manhole of the upper box girder top plate 31. S43, welding crane support assembly 8, and flange 14 installed on the upper tower section 13.

[0045] S44. Paint the transition section structure; after lifting the entire transition section structure, weld it together with the main body of the jacket frame.

[0046] In summary, the present invention discloses a novel wind turbine transition section structure and its construction method. The central tower is connected to the chord by an upper box girder assembly, a lower box girder assembly, and webs of the upper and lower box girders. The upper and lower box girder assemblies are arranged at different angles, thereby increasing the connection strength between the central tower and the chord in different directions. Furthermore, the connection of the upper and lower box girder webs to the central tower, chord, upper and lower box girder assemblies respectively enhances the overall connection strength of the transition section structure. The arrangement of the upper and lower box girder assemblies and webs ensures the bending and torsional stiffness of the box girder assembly. Connecting the outer platform to the central tower, chord, and webs of the upper and lower box girders increases the space of the outer platform and improves the overall structural stiffness. Placing the lifting lugs on the chord at the bottom of the outer platform reduces the space occupied on the platform and allows them to serve as lifting points during construction. Fixing the crane support to the chord further reduces the space occupied on the platform. Simultaneously, the transition section has fewer structural components, facilitating fabrication and reducing the workload. In addition, it is equipped with an external platform, lifting lugs, and crane support components, which not only improves the structural strength but also makes construction more convenient.

[0047] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A new fan transition section structure, characterized in that, It includes a central tower and at least three chord members disposed on the outside of the central tower; The central tower and the chord are provided with an upper box girder plate assembly, a lower box girder plate assembly, and upper and lower box girder webs; Both ends of the upper box girder assembly are connected to the central tower and the chord, respectively. Both ends of the lower box girder assembly are respectively connected to the central tower and the chord; The upper box girder assembly and the lower box girder assembly form a first included angle; The two ends of the web of the upper and lower box girders are respectively connected to the central tower and the chord, and one side of the web of the upper and lower box girders is simultaneously attached to the side of the upper box girder assembly and the side of the lower box girder assembly.

2. A novel fan transition section structure according to claim 1, characterized in that, The upper box girder plate assembly includes an upper box girder top plate and an upper box girder bottom plate. The upper box girder bottom plate and the lower box girder plate assembly form a first included angle, and the upper box girder top plate and the lower box girder plate assembly form a second included angle. The lower box girder assembly includes a top plate and a bottom plate of the lower box girder arranged in parallel. The upper and lower box girder webs include an integrally formed inclined section and a horizontal section. The inclined section is connected to the top plate and bottom plate of the upper box girder, and the horizontal section is connected to the top plate and bottom plate of the lower box girder.

3. The novel wind turbine transition section structure according to claim 1, characterized in that, The beam width of the upper box girder plate assembly gradually increases from the chord member to the central tower. The beam width of the lower box girder plate group gradually increases from the chord to the central tower.

4. The novel wind turbine transition section structure according to claim 1, characterized in that, The first included angle includes 30°-45°.

5. The novel wind turbine transition section structure according to claim 1, characterized in that, An outer platform is provided between two adjacent chord members; The outer platform is connected to the upper and lower box girder webs on the two adjacent chords, and is also connected to the central tower.

6. The novel wind turbine transition section structure according to claim 5, characterized in that, Each of the aforementioned chords is provided with at least two lugs; The included angle between the two lugs on the same chord is 120°-180°, and the lugs are located on the chord segment below the outer platform.

7. The novel wind turbine transition section structure according to claim 5, characterized in that, The outer platform is equipped with L-shaped reinforcing beams, T-shaped reinforcing beams and C-shaped reinforcing beams; The L-shaped reinforcing beam is located at the outer edge of the bottom of the outer platform; The T-shaped reinforcing beam and the C-shaped reinforcing beam are located at the bottom of the outer platform, and the C-shaped reinforcing beam is connected to the T-shaped reinforcing beam.

8. The novel wind turbine transition section structure according to claim 6, characterized in that, A support plate or a perforated support plate is provided at the position where the outer platform connects to the chord.

9. The novel wind turbine transition section structure according to claim 1, characterized in that, At least one of the chord members is provided with a crane support assembly; The crane support assembly includes a crane support tube, a crane support plate, a crane support tube, a crane support top plate, and a crane support rib. The crane support tube is mounted on the chord and is coaxially arranged with the chord. The crane support plate is located at the end of the crane support tube away from the chord; One end of the crane support pipe is connected to the crane support plate, and the other end is connected to the top plate of the crane support. The crane support rib is disposed between the crane support plate and the crane support top plate, and is connected to the crane support plate, the crane support top plate and the crane support support pipe respectively.

10. A construction method for a novel wind turbine transition section structure, characterized in that, The method applied to the construction of a novel wind turbine transition section structure as described in any one of claims 1-9 includes: Connect the lower box girder slab assembly to the chord members; Connect the web plates of the upper and lower box girders to the chords and the lower box girder plate assembly; Connect the lower box girder slab assembly and the webs of the upper and lower box girders to the central tower. Connect the upper box girder plate assembly to the central tower, chord, and webs of the upper and lower box girders.

Images