Assembly type damping combined structure wind power tower drum

Abstract

The utility model provides an assembly type damping combined structure wind power tower drum, and relates to the technical field of wind power generation buildings. Comprising prefabricated tower tube sections, flange plate connecting components and tower tube crawling ladders. Wherein each prefabricated tower drum section comprises a hollow FRP pipe column and a steel pipe column, a pouring cavity is formed between the FRP pipe column and the steel pipe column, and UHPC concrete is poured into the pouring cavity to form an FRP-steel pipe concrete combined structure; the adjacent prefabricated tower tube sections are connected through flange plate connecting components; and the tower drum crawling ladder is arranged on the inner side of the prefabricated tower drum section. According to the scheme, the wind power tower drum with the assembly type damping combined structure has the advantages of being capable of being prefabricated on a large scale, convenient to transport and install, short in construction period and the like.

Description

Technical Field

[0001] This utility model relates to the field of wind power building technology, and more specifically, to a prefabricated vibration-damping combined structure wind power tower. Background Technology

[0002] Wind energy is a clean and renewable resource. In recent years, wind power has become one of the main energy forms in China as a clean energy source. With the transformation and upgrading of the wind power building industry, prefabricated buildings are receiving increasing attention from the engineering community in order to improve building quality, accelerate construction speed, achieve energy conservation and environmental protection, and reduce project costs. Compared with traditional building construction methods, prefabricated buildings have obvious technical and economic advantages, saving labor, formwork, and machinery, improving quality, reducing emissions, reducing pollution, and saving construction time. However, there are still many problems with prefabricated buildings. For example, the connection nodes of prefabricated building structures are the weakest links in the overall building structure, posing many obstacles from both construction and mechanical perspectives.

[0003] Concrete-filled steel tube (CFST) wind turbine towers combine the excellent tensile strength of steel with the excellent compressive strength of concrete, achieving optimal overall tower economy while ensuring structural safety, making them a promising future mainstream tower structure type. However, current CFST composite tower structures typically involve filling concrete inside steel tube columns, leaving the steel tubes directly exposed and susceptible to corrosion. Utility Model Content

[0004] This utility model discloses a prefabricated vibration-damping combined structure wind turbine tower, which aims to solve the problems mentioned above.

[0005] The present invention adopts the following solution:

[0006] A prefabricated vibration-damping combined structure wind turbine tower includes: prefabricated tower segments, flange connecting components, and tower ladders; wherein, each prefabricated tower segment includes hollow FRP pipe columns and steel pipe columns, forming a casting cavity between the FRP pipe columns and steel pipe columns, and UHPC concrete is poured into the casting cavity to form an FRP-steel pipe concrete composite structure; adjacent prefabricated tower segments are connected by flange connecting components; and the tower ladders are located inside each prefabricated tower segment.

[0007] Furthermore, the prefabricated tower segment comprises, from top to bottom, a first prefabricated tower segment, a second prefabricated tower segment, a third prefabricated tower segment, and a fourth prefabricated tower segment. The FRP pipe diameter of the first prefabricated tower segment is the same as the steel pipe diameter of the second prefabricated tower segment; the FRP pipe diameter of the second prefabricated tower segment is the same as the steel pipe diameter of the third prefabricated tower segment; and the FRP pipe diameter of the third prefabricated tower segment is the same as the steel pipe diameter of the fourth prefabricated tower segment.

[0008] Furthermore, the flange connector comprises upper and lower flanges, a high-strength bolt, a shape memory alloy bolt, a flat washer, a spring washer, and a high-strength nut; wherein the high-strength bolt and the shape memory alloy bolt are embedded in the concrete of the precast tower segment; the flange is provided with multiple mounting holes, wherein the upper flange is welded and fixed to the steel pipe in the upper precast tower segment, and the lower flange is fitted into the high-strength bolt and the shape memory alloy bolt embedded in the lower precast tower segment; during installation, the upper flange on the upper precast tower segment is adapted to fit into the high-strength bolt and the shape memory alloy bolt in the lower precast tower segment, and is fastened through the mounting holes of the high-strength nut, the flat washer, and the spring washer.

[0009] Furthermore, the high-strength screw and the shape memory alloy screw are distributed circumferentially at the upper end of the prefabricated tower segment, and the high-strength screw and the shape memory alloy screw are distributed alternately at equal intervals.

[0010] Furthermore, a flat washer and a spring washer are placed on the side of the high-strength nut, wherein the flat washer is disposed on the upper surface of the upper flange, and the spring washer is between the flat washer and the high-strength nut.

[0011] Furthermore, the tower ladder includes a ladder support assembly, which includes a ladder assembly and multiple support assemblies. The support assembly is adapted to be installed on the inner wall of the tower and includes an arc-shaped steel plate, a first connector, a second connector, and a rectangular connecting steel plate. The arc-shaped steel plate is welded to the inner wall of the tower, and the rectangular connecting steel plate is connected to the arc-shaped steel plate by welding. The second connector is connected to one end of the two rectangular connecting steel plates, and the ladder is connected to the second connector. The ladder assembly includes a ladder, a transverse connecting steel pipe, and a protective frame. One end of the transverse connecting steel pipe is connected to the second connector, and the other end is connected to the protective frame through the first connector, so that the protective frame is mounted on the outside of the ladder.

[0012] Furthermore, it also includes a safety rope anti-derailment post, which is vertically connected to the transverse connecting steel pipe.

[0013] Beneficial effects:

[0014] The prefabricated vibration-damping combined structure wind turbine tower adopted in this scheme can adapt to various harsh natural environments, has certain seismic performance, and has a faster construction progress. Compared with the on-site cast-in-place wind turbine tower, the prefabricated assembled combined structure wind turbine tower has the advantages of large-scale prefabrication, convenient transportation and installation, and short construction period. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a prefabricated vibration-damping combined structure wind turbine tower according to an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the fourth prefabricated tower section and flange connection of a prefabricated vibration-damping combined structure wind turbine tower according to an embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the ladder support assembly of a prefabricated shock-absorbing combined structure wind turbine tower according to an embodiment of this utility model;

[0018] Figure 4 This is a structural schematic diagram of the fourth prefabricated tower of a wind turbine tower with a prefabricated vibration-damping combined structure according to an embodiment of this utility model;

[0019] Reference numerals: 1: First precast tower segment; 2: Second precast tower segment; 3: Third precast tower segment; 4: Fourth precast tower segment; 4-1: Steel pipe column; 4-2: UHPC concrete; 4-3: FRP pipe column; 5: First flange connection component; 6: Second flange connection component; 7: Third flange connection component; 8: Fourth flange connection component; 8-1: High-strength nut; 8-2: Spring washer; 8-3: Flat... 8-4: Washer ring; 8-5: Upper flange; 8-6: Lower flange; 8-7: High-strength screw; 8-8: Shape memory alloy screw; 9: Generating unit; 10: Ladder support assembly; 10-1: Ladder; 10-2: Curved steel plate; 10-3: Bolted connection; 10-4: Rectangular connecting steel plate; 10-5: First connector; 10-6: Protective frame; 10-7: Second connector; 10-8: Horizontal steel pipe; 10-9: Safety rope anti-derailment column. Detailed Implementation

[0020] Combination Figure 1This embodiment provides a prefabricated vibration-damping combined structure wind turbine tower, including: prefabricated tower segments, flange connecting components, and tower ladder 10-1; wherein, the prefabricated tower segment includes hollow FRP pipe column 4-3 and steel pipe column 4-1, and a casting cavity is formed between the FRP pipe column 4-3 and the steel pipe column 4-1, and UHPC concrete 4-2 is poured into the casting cavity to form an FRP-steel pipe concrete composite structure; adjacent prefabricated tower segments are connected by flange connecting components; the tower ladder 10-1 is arranged inside the prefabricated tower segment.

[0021] Combination Figures 1 to 4 As shown, in this embodiment, the prefabricated tower segments include, from top to bottom, a first prefabricated tower segment 1, a second prefabricated tower segment, a third prefabricated tower segment 3, and a fourth prefabricated tower segment 4. The diameter of the FRP pipe 4-3 of the first prefabricated tower segment 1 is the same as the diameter of the steel pipe 4-1 of the second prefabricated tower segment 2; the diameter of the FRP pipe 4-3 of the second prefabricated tower segment 2 is the same as the diameter of the steel pipe 4-1 of the third prefabricated tower segment 3; and the diameter of the FRP pipe 4-3 of the third prefabricated tower segment 3 is the same as the diameter of the steel pipe 4-1 of the fourth prefabricated tower segment 4. The power generation device 9 is installed at the upper end of the first prefabricated tower section and is also connected by the flange connection component. Here, the flange connection component between the first prefabricated tower section and the power generation device 9 is defined as the first flange connection component 5, the flange connection component between the first prefabricated tower section and the second prefabricated tower section is defined as the second flange connection component 6, the flange connection component between the second prefabricated tower section and the third prefabricated tower section is defined as the third flange connection component 7, and the flange connection component between the third prefabricated tower section and the fourth prefabricated tower section is defined as the fourth flange connection component 8. It should be noted that in other embodiments, the number of prefabricated tower sections can be 2, 3, 5, or even more.

[0022] FRP-concrete composite steel tube wind turbine towers can be considered as cantilever beams with concentrated mass and rotational inertia at their free ends. The loads on the tower structure mainly include wind loads on the tower body and the horizontal thrust of the wind turbine at the top. Damage to the tower is caused by the coupled effects of axial stress and lateral bending and shear. This damage accumulates under disturbance loads, and fatigue failure generally occurs in localized high-stress areas. The tower structure has a variable cross-section, with high stress appearing at the outer diameter surface of the segment sections. UHPC (Ultra-High-Pressure Polymer) possesses extremely high mechanical properties, durability, and performance. Its compressive strength can reach 180–200 MPa, and its flexural strength can reach 20–30 MPa. The steel fiber reinforcement and toughening enhance the material's fatigue performance. FRP-concrete composite steel tube structures are suitable for special engineering structures subjected to dynamic and fatigue loads.

[0023] Combination Figures 1 to 2As shown, the flange connector comprises upper and lower flanges, a high-strength bolt 8-6, a shape memory alloy bolt 8-7, a flat washer 8-3, a spring washer 8-2, and a high-strength nut 8-1. The high-strength bolt 8-6 and the shape memory alloy bolt are embedded in the concrete of the precast tower segment. The flanges have multiple mounting holes. The upper flange 8-4 is welded and fixed to the steel pipe in the upper precast tower segment, while the lower flange 8-5 is fitted into the high-strength bolt 8-6 and the shape memory alloy bolt 8-7 embedded in the lower precast tower segment. During installation, the upper flange 8-4 on the upper precast tower segment is adapted to fit into the high-strength bolt 8-6 and the shape memory alloy bolt 8-7 in the lower precast tower segment and is tightened through the mounting holes of the high-strength nut 8-1, the flat washer 8-3, and the spring washer 8-2. Here, a flat washer 8-3 and a spring washer 8-2 are placed on the side of the high-strength nut 8-1. The flat washer 8-3 is located on the upper surface of the upper flange 8-4, and the spring washer 8-2 is located between the flat washer 8-3 and the high-strength nut 8-1. The flat washer 8-3 is used to increase the force-bearing surface of the screw. The spring washer 8-2 is used to prevent the screw from loosening and provides a certain amount of buffer protection when under force.

[0024] During on-site assembly, taking the third precast tower segment 3 and the fourth precast tower segment 4 as examples, the steel pipe in the third precast tower segment 3 is welded and fixed to the upper flange 8-4. Simultaneously, the lower flange 8-5 is fitted into the pre-embedded high-strength bolts 8-6 and shape memory alloy bolts 8-7 in the fourth precast tower segment 4. The two flanges are then joined together and tightened using the high-strength nuts 8-1 installed in the mounting holes. This forms a double-layered defense for strong node connection. Furthermore, the pre-embedded high-strength bolts 8-6 and shape memory alloy bolts 8-7, along with the pre-embedded holes in the flanges, ensure precise positioning between the upper and lower segments, thereby reducing construction difficulty.

[0025] The high-strength screws 8-6 and shape memory alloy screws 8-7 are distributed circumferentially at the upper end of the prefabricated tower section, with the high-strength screws 8-6 and shape memory alloy screws 8-7 evenly spaced and staggered. For example, taking a configuration of six high-strength screws 8-6 and six shape memory alloy screws 8-7 as an example, during installation, the screws are numbered clockwise, then in the order ①→⑦→④→⑩. Tighten diagonally in the following sequence. The first round should be 10% of the target tightening torque, the second round 20%, the third round 60%, and the fourth round 100% to prevent uneven tightening. When pre-embedding the high-strength bolts 8-6 and shape memory alloy bolts 8-7, first connect the bolts to the lower flange 8-5 to ensure that the high-strength bolts 8-6 and shape memory alloy bolts 8-7 do not misalign during the pre-embedding process.

[0026] Combination Figure 1 and Figure 3 As shown, in this embodiment, the tower ladder 10-1 includes a ladder support assembly 10. The ladder support assembly 10 includes a ladder 10-1 assembly and multiple support assemblies. The support assembly is adapted to be installed on the inner wall of the tower and includes an arc-shaped steel plate 10-2, a first connecting member 10-5, a second connecting member 10-7, and a rectangular connecting steel plate 10-4. The arc-shaped steel plate 10-2 is welded to the inner wall of the tower, and the rectangular connecting steel plate 10-4 is connected to the arc-shaped steel plate 10-2 by welding. Connector 10-7 is connected to one end of the two rectangular connecting steel plates 10-4, and ladder 10-1 is connected to the second connector 10-7. The ladder 10-1 assembly includes ladder 10-1, transverse connecting steel pipe 10-8, and protective frame 10-6. One end of the transverse connecting steel pipe 10-8 is connected to the second connector 10-7, and the other end is connected to the protective frame 10-6 via a first connector 10-5, so that the protective frame 10-6 is mounted on the outside of the ladder 10-1. It also includes a safety rope anti-detachment post 10-9, which is vertically connected to the transverse connecting steel pipe 10-8.

[0027] The construction process includes the following steps:

[0028] S1. Complete the prefabrication of the first prefabricated tower segment 1, the second prefabricated tower segment 2, the third prefabricated tower segment 3 and the fourth prefabricated tower segment 4 in the prefabrication plant;

[0029] S2. Before pouring the first precast tower segment 1, the second precast tower segment 2 and the third precast tower segment 3, connect the high-strength screw 8-6 and the shape memory alloy screw 8-7 to the lower flange 8-5, then pre-embed the high-strength screw 8-6 and the shape memory alloy screw 8-7, and pour concrete and cure after the formwork is erected.

[0030] S3. Weld and fix the steel pipe in the third precast tower section 3 to the upper flange 8-4.

[0031] S4. Fit the lower flange 8-5 into the high-strength bolt 8-6 and shape memory alloy bolt 8-7 reserved in the fourth prefabricated tower section 4;

[0032] S5. When the two flanges are joined together, a flat washer 8-3 and a spring washer 8-2 are placed on the side of the high-strength nut 8-1. The flat washer 8-3 is adjacent to the surface of the upper flange, and the spring washer 8-2 is between the flat washer 8-3 and the high-strength nut 8-1.

[0033] S6. Number the high-strength screw 8-6 and the shape memory alloy screw 8-7 in sequence. Following the sequence ①→⑦→④→⑩, Tighten diagonally in the following sequence: the first round is 10% of the target tightening torque, the second round is 20% of the target tightening torque, the third round is 60% of the target tightening torque, and the fourth round is 100% of the target tightening torque.

[0034] Repeat operations S3, S4, S5 and S6 to achieve the assembly between the first prefabricated tower segment 1 and the second prefabricated tower segment 2, between the second prefabricated tower segment 2 and the third prefabricated tower segment 3, and between the power generation device 9 and the first prefabricated tower segment 1.

[0035] S7. After the main structure is assembled, install the internal ladder support component 10.

[0036] In this embodiment, the outermost layer is made of fiber-reinforced plastic (FRP). FRP has high tensile strength, excellent corrosion resistance and durability, and basically does not increase the self-weight of the original structure or the size of the original components.

[0037] To achieve the green and low-carbon energy transition, wind turbine generators are becoming increasingly larger, and the requirements for tower structures in wind power technology are constantly increasing. With the increase in height, the diameter of the base of traditional steel towers reaches the transportation limit, and the weight of the tower increases exponentially with height, resulting in poor economic efficiency. Therefore, this embodiment adopts a steel-concrete composite structure wind turbine tower that combines the excellent tensile strength of steel pipes with the excellent compressive strength of concrete. It is not subject to transportation limitations and can achieve optimal economic efficiency while ensuring structural safety.

[0038] The nacelle and blades of the wind turbine tower structure are relatively heavy, and the tower may deform excessively under seismic loads. Therefore, the connection method is crucial for the safe and reliable operation of the upper wind turbine. This embodiment uses flanges, high-strength bolts 8-6, shape memory alloy bolts 8-7, flat washers 8-3, and spring washers 8-2, bolted to connect the 10-3 wind turbine tower. The high-strength bolts not only possess extremely high material strength but also apply significant pre-tension during installation. This pre-tension generates strong compressive force between the connecting components, resulting in significant frictional force perpendicular to the bolts. The shape memory alloy bolts 8-7 have an energy-dissipating mechanism, effectively reducing the seismic energy input to the upper structure, thus achieving energy saving and vibration reduction. The flat washers 8-3 increase the contact area between the bolts and the machine, eliminating the damage to the machine surface caused by the spring washers 8-2 when unscrewing the bolts. The spring washers 8-2 have good anti-loosening properties and also good seismic resistance.

[0039] It should be understood that the above are only preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions that fall within the scope of the present utility model are protected by the present utility model.

[0040] The accompanying drawings used in the above description of the embodiments only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

Claims

1. A fabricated damping composite structure wind power tower, characterized in that, The application relates to a prefabricated tower drum segment, a flange plate connecting member and a tower drum ladder. The prefabricated tower drum segment comprises a hollow FRP pipe column and a steel pipe column, a pouring cavity is formed between the FRP pipe column and the steel pipe column, UHPC concrete is poured into the pouring cavity to form a FRP-steel pipe concrete composite structure, adjacent prefabricated tower drum segments are connected through flange plate connecting members, and the tower drum ladder is arranged on the inner side of the prefabricated tower drum segment.

2. The fabricated seismic combined-structure wind power tower of claim 1, wherein, The prefabricated tower drum segment comprises a first prefabricated tower drum segment, a second prefabricated tower drum segment, a third prefabricated tower drum segment and a fourth prefabricated tower drum segment from top to bottom, the FRP pipe column of the first prefabricated tower drum segment has the same diameter as the steel pipe column of the second prefabricated tower drum segment, the FRP pipe column of the second prefabricated tower drum segment has the same diameter as the steel pipe column of the third prefabricated tower drum segment, and the FRP pipe column of the third prefabricated tower drum segment has the same diameter as the steel pipe column of the fourth prefabricated tower drum segment.

3. The fabricated seismic combination structure wind power tower drum of claim 1, wherein, The flange plate connecting member comprises upper and lower flange plates, high-strength screws, memory alloy screws, flat washers, spring washers and high-strength nuts, wherein the high-strength screws and the memory alloy screws are embedded in the concrete of the prefabricated tower drum segment. The flange plate is provided with a plurality of mounting holes, the upper flange plate is welded and fixed with the steel pipe in the upper prefabricated tower drum segment, the lower flange plate is sleeved on the high-strength screws and the memory alloy screws embedded in the lower prefabricated tower drum segment, the upper flange plate of the upper prefabricated tower drum segment is adapted to be sleeved on the high-strength screws and the memory alloy screws in the lower prefabricated tower drum segment during installation, and the high-strength nuts, the flat washers and the spring washers are used for fastening.

4. The fabricated seismic combination structure wind power tower drum of claim 3, wherein, The high-strength screws and the memory alloy screws are circumferentially distributed on the upper end of the prefabricated tower drum segment, and the high-strength screws and the memory alloy screws are distributed at equal intervals.

5. The fabricated seismic combination structure wind power tower drum of claim 3, wherein, The high-strength nut is laterally provided with a flat washer and a spring washer, the flat washer is arranged on the upper surface of the upper flange plate, and the spring washer is arranged between the flat washer and the high-strength nut.

6. The fabricated seismic-force-resisting composite structural wind turbine tower of claim 1, wherein, The tower drum ladder comprises a ladder support assembly, the ladder support assembly comprises a ladder assembly and a plurality of support assemblies, the support assembly is adapted to be arranged on the inner wall surface of the tower drum, and the support assembly comprises an arc-shaped steel plate, a first connecting member, a second connecting member and a rectangular connecting steel plate, the arc-shaped steel plate is welded on the inner wall surface of the tower drum, the rectangular connecting steel plate is connected with the arc-shaped steel plate through welding, the second connecting member is connected with one end of the two rectangular connecting steel plates, and the ladder is connected with the second connecting member; the ladder assembly comprises a ladder, a transverse connecting steel pipe and a protective frame, one end of the transverse connecting steel pipe is connected with the second connecting member, the other end of the transverse connecting steel pipe is connected with the protective frame through the first connecting member, and the protective frame is arranged on the outer side of the ladder.

7. The fabricated seismic combination structure wind power tower drum of claim 6, wherein, The safety rope anti-falling column is vertically connected with the transverse connecting steel pipe.

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