An externally wrapped concrete - double corrugated steel plate concrete composite tower barrel and construction method

Abstract

An externally wrapped concrete - double corrugated steel plate concrete composite tower barrel and construction method, including barrel segments. The barrel segments are connected circumferentially by multiple externally wrapped concrete - double corrugated steel plate concrete composite tower barrel units through prestressed bent bolts, and adjacent barrel segments are tightly connected by L-shaped flange plates and high-strength bolts. The composite tower barrel unit includes a corrugated inner steel plate, a corrugated outer steel plate, prestressed steel bars, externally wrapped concrete, sandwich concrete, an upper end plate, and a lower end plate. The tower barrel can be flexibly designed from bottom to top according to requirements. The upper tower barrel segment can choose not to be filled with sandwich concrete, which can reduce the self-weight of the tower barrel structure and facilitate hoisting. The present invention improves the bearing capacity while reducing the cross-sectional size of components, has good ductility and energy dissipation capacity, and at the same time improves the flexural and crack resistance performance of the tower barrel, ensuring the stiffness and stability of the tower barrel. The composite tower barrel is prefabricated in pieces, transported in pieces, and assembled on site, with high construction efficiency. It can greatly increase the height of the fan tower barrel and meet the development requirements of low wind speed areas.

Description

Technical Field

[0001] The present invention belongs to the technical field of the design of wind turbine towers, and particularly relates to a concrete - double corrugated steel plate concrete composite tower and a construction method thereof. Background Art

[0002] As an important load - bearing component in a wind turbine, the tower plays a role in connecting the nacelle and the foundation, supporting the wind turbine that captures wind energy at a favorable height to achieve the most economical and safe energy utilization. The importance of the tower becomes more prominent as the capacity and height of the wind turbine increase. At present, wind turbine towers are developing towards high - power and high - tower structures. For traditional concrete towers, on - site grouting and curing are required at the joints, with many construction procedures and a long installation period. Moreover, after the concrete tower is higher than 100 meters, the weight will increase exponentially, resulting in a large self - weight of the tower, poor economy, and difficulty in meeting the use requirements.

[0003] Therefore, developing a new type of tower with better performance and economy is of great significance for the full development and utilization of wind energy resources. Summary of the Invention

[0004] In order to overcome the above - mentioned disadvantages of the prior art, the purpose of the present invention is to provide a concrete - double corrugated steel plate concrete composite tower and a construction method thereof, in order to solve the problems such as the large self - weight and low economic performance of the existing traditional concrete towers.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A concrete - double corrugated steel plate concrete composite tower is composed of several barrel segments joined vertically. Each barrel segment is composed of multiple concrete - double corrugated steel plate concrete composite tower units connected by prestressed bent bolts along the circumferential direction. The adjacent upper and lower barrel segments are connected and fastened by L - shaped flange plates.

[0007] The concrete - double corrugated steel plate concrete composite tower unit includes a corrugated inner steel plate, a corrugated outer steel plate, prestressed steel bars, outer - wrapped concrete, an upper end plate, and a lower end plate. Among them, the corrugated inner steel plate, the corrugated outer steel plate, and the outer - wrapped concrete form a cavity.

[0008] Along the circumferential direction, adjacent concrete - double corrugated steel plate concrete composite tower units are connected into one body by prestressed bent bolts to form a barrel segment. In the cavities of the concrete - double corrugated steel plate concrete composite tower units of several barrel segments, sandwich concrete is filled.

[0009] Along the vertical direction, adjacent barrel segments are connected by L - shaped flange plates and high - strength bolts to form a composite tower.

[0010] In one embodiment, the corrugated inner steel plate and the corrugated outer steel plate are symmetrically distributed along the central axis of the cross-section of the barrel section and have the same radian. They are respectively arranged at a distance of 50±5 mm from the inner and outer walls of the tower barrel, and the axial direction of the corrugations is arranged vertically along the barrel section.

[0011] In one embodiment, the waveforms of the corrugated inner steel plate and the corrugated outer steel plate are sinusoidal waveforms. The corrugations are wide corrugations, the length of the wave crest is twice that of the wave trough, the length of the wave crest is 100 mm to 300 mm, the folding angle is 45 degrees to 60 degrees, and the ratio of the wave height to the wavelength is 0.1 to 0.2.

[0012] In one embodiment, a plurality of stud bolts are welded to both the corrugated inner steel plate and the corrugated outer steel plate. The stud bolts are evenly arranged circumferentially and extend into the outer wrapped concrete. A plurality of reserved holes are evenly arranged circumferentially on the corrugated inner steel plate and the corrugated outer steel plate, and they are connected by tie bolts. The stud bolts and the tie bolts are arranged at intervals vertically.

[0013] In one embodiment, prestressed steel bar holes are arranged inside the outer wrapped concrete. Prestressed steel bars are arranged vertically along the barrel section, and the prestressed steel bars are anchored to the upper end plate and the lower end plate of the outer wrapped concrete - double corrugated steel plate concrete combined tower barrel unit.

[0014] In one embodiment, there are square bolt grooves for circumferential installation and connection of adjacent tower barrel units on both sides of the outer wrapped concrete - double corrugated steel plate concrete combined tower barrel unit, and bolt holes are reserved in the bolt grooves.

[0015] In one embodiment, the outer wrapped concrete adopts ultra-high performance concrete or self-compacting concrete, and the sandwich concrete is ordinary concrete. The tower barrel can be flexibly designed from bottom to top according to requirements. The upper barrel section may not be filled with sandwich concrete, and only the cavity of the outer wrapped concrete - double corrugated steel plate concrete combined tower barrel unit in the lower barrel section of the combined tower barrel needs to be filled to form an outer wrapped concrete - double corrugated steel plate hollow concrete combined tower barrel.

[0016] In one embodiment, the L-shaped flange is welded by an annular connecting plate, an annular flange plate and a rib plate. Reserved holes corresponding to high-strength bolts are arranged on the annular flange plate. Each section of the L-shaped flange is assembled in segments circumferentially, and adjacent rib plates are welded.

[0017] In one embodiment, the L-shaped flange is respectively welded to the lower end plate of the upper barrel section and the upper end plate of the lower barrel section, and is connected by high-strength bolts.

[0018] The present invention also provides a construction method for the outer wrapped concrete - double corrugated steel plate concrete combined tower barrel, including:

[0019] 1) Processing the steel plates into corrugated inner steel plates and corrugated outer steel plates and performing curling, and processing the L-shaped flange.

[0020] 2) Weld stud bolts on the outer sides of the inner corrugated steel plate and the outer corrugated steel plate, and connect them with tie bolts. Reserve prestressed reinforcement holes and pour the outer concrete. Reserve square bolt grooves at both ends, pour the sandwich concrete, weld the upper end plate and the lower end plate, and tension the prestressed reinforcement to complete the construction of the outer concrete-double corrugated steel plate concrete composite tower barrel unit. The L-shaped flange plates are respectively welded to the lower end plate of the upper barrel section and the upper end plate of the lower barrel section.

[0021] 3) Transport the prefabricated outer concrete-double corrugated steel plate concrete composite tower barrel units to the site, connect them circumferentially through prestressed bent bolts, and connect adjacent barrel sections through L-shaped flange plates and high-strength bolts to form a composite tower barrel.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1) Convenient construction

[0024] The barrel sections of the composite tower barrel are composed of multiple outer concrete-double corrugated steel plate concrete composite tower barrel units circumferentially. The method of segmental prefabrication can be used for batch standardized construction production and maintenance. It can be prefabricated in the factory and assembled on site, reducing the use of large-scale equipment at the construction site and facilitating transportation and stacking at the construction site. The tower barrel is connected circumferentially through prestressed bent bolts and vertically through flange plates. Compared with the traditional concrete tower barrel using grouting connection, the construction period is shortened and the installation is convenient.

[0025] Performance improvement

[0026] The composite tower barrel has good stability, high bearing capacity and good anti-fatigue performance. The segmental prefabrication can ensure the construction quality. The internal corrugated steel plate increases the contact area between the steel plate and the concrete compared with the flat steel plate, and the composite effect is better. The composite tower barrel has a higher steel content ratio in the cross section compared with the traditional concrete tower barrel, which can reduce the cross section of the component, improve the bearing capacity, and has good ductility and energy dissipation capacity. By using prestressed tendons, the whole tower barrel is in a compressed state, greatly improving the bending resistance and crack resistance of the tower barrel, and ensuring the stiffness and stability of the tower barrel. The tower barrel can be flexibly designed from bottom to top according to requirements. The upper barrel section can not be filled with sandwich concrete to form an outer concrete-double corrugated steel plate hollow concrete composite tower barrel, which can reduce the self-weight of the tower barrel structure and facilitate hoisting. It can be used in more scenarios.

[0027] Good economy

[0028] The prefabrication of the combined tower barrel in segments can reduce the number of formworks, which can be reused, thus reducing costs. Segment transportation saves transportation costs. On-site assembly improves construction efficiency and reduces construction costs. The combined tower barrel has excellent overall performance and fewer maintenance frequencies, thereby reducing the later operation and maintenance costs. The external concrete uses ultra-high performance concrete, self-compacting concrete, etc., and the sandwich concrete is ordinary concrete, reducing material costs.

[0029] Generally speaking, the use of the external concrete - double corrugated steel plate concrete combined tower barrel has good stability, high bearing capacity and good anti-fatigue performance. The internal corrugated steel plate increases the steel content ratio of the cross-section compared with the traditional concrete tower barrel. While improving the bearing capacity, it reduces the cross-sectional size of the component, and has good ductility and energy dissipation capacity. The use of prestressed tendons greatly improves the bending resistance and crack resistance of the tower barrel, ensuring the stiffness and stability of the tower barrel. The tower barrel can be flexibly designed from bottom to top according to requirements, and the upper barrel section can not be filled with sandwich concrete to form an external concrete - double corrugated steel plate hollow concrete combined tower barrel. The combined tower barrel is prefabricated in segments, transported in segments and assembled on site, with good economy and high construction efficiency. It can greatly increase the height of the fan tower barrel, meet the development requirements of low wind speed areas, and has good application prospects. Description of the Drawings

[0030] Figure 1 It is a cross-sectional view of the external concrete - double corrugated steel plate concrete combined tower barrel unit of the present invention.

[0031] Figure 2 It is an overall schematic diagram of the external concrete - double corrugated steel plate concrete combined tower barrel of the present invention.

[0032] Figure 3 It is an overall schematic diagram of the external concrete - double corrugated steel plate concrete combined tower barrel unit of the present invention.

[0033] Figure 4 It is a schematic diagram of the splicing of the external concrete - double corrugated steel plate concrete combined tower barrel unit of the present invention.

[0034] Figure 5 It is a schematic diagram of the ring groove rivet of the present invention.

[0035] Icon: 1 - barrel section; 2 - external concrete - double corrugated steel plate concrete combined tower barrel unit; 3 - prestressed bending bolt; 4 - L-shaped flange; 5 - corrugated inner steel plate; 6 - corrugated outer steel plate; 7 - prestressed steel bar; 8 - external concrete; 9 - sandwich concrete; 10 - upper end plate; 11 - lower end plate; 12 - high-strength bolt; 13 - stud; 14 - tension bolt; 15 - square bolt groove; 16 - annular connecting plate; 17 - annular flange; 18 - rib plate; 19 - ring groove rivet. Detailed Embodiments

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0038] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is customarily placed during use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] As mentioned above, currently, on-site grouting and curing are required at the joints of traditional concrete tower barrels. There are many construction procedures, the installation period is long, and after the concrete tower barrel is higher than 100 meters, the weight will increase exponentially, resulting in a large self-weight of the tower barrel and poor economy, making it difficult to meet the usage requirements. Therefore, developing a new type of tower barrel with better performance and economy is of great significance for the full development and utilization of wind energy resources.

[0041] Based on this, the present invention provides a concrete-filled double corrugated steel plate concrete composite tower barrel and a construction method thereof, which have good stability, high bearing capacity and good anti-fatigue performance. The built-in corrugated steel plate increases the steel content ratio of the cross-section of the traditional concrete tower barrel. While improving the bearing capacity, it reduces the cross-sectional size of the component, and has good ductility and energy dissipation capacity. The use of prestressed tendons greatly improves the bending resistance and crack resistance of the tower barrel, ensuring the stiffness and stability of the tower barrel. The tower barrel can be flexibly designed from bottom to top according to requirements. The upper barrel section 1 can be not filled with sandwich concrete to form a concrete-filled double corrugated steel plate hollow concrete composite tower barrel. The composite tower barrel is prefabricated in pieces, transported in pieces and assembled on site, with good economy and high construction efficiency. It can greatly increase the height of the fan tower barrel, meet the development requirements of low wind speed areas, and has good application prospects, especially suitable for tower barrels higher than 100 meters.

[0042] Specifically, referring to Figures 1 to 5 , the composite tower barrel of the present invention includes a barrel section 1. The barrel section 1 is connected circumferentially by a plurality of concrete-filled double corrugated steel plate concrete composite tower barrel units 2 through prestressed bent bolts 3, and the adjacent upper and lower barrel sections 1 are connected and fastened by an L-shaped flange 4.

[0043] The concrete-filled double corrugated steel plate concrete composite tower barrel unit 2 includes a corrugated inner steel plate 5, a corrugated outer steel plate 6, prestressed steel bars 7, concrete-filled outer layer 8, an upper end plate 10, and a lower end plate 11. Among them, the corrugated inner steel plate 5, the corrugated outer steel plate 6 and the concrete-filled outer layer 8 form a cavity. The concrete-filled outer layer 8 is filled outside the cavity, that is, filled inside the corrugated inner steel plate 5 and outside the corrugated outer steel plate 6 respectively. The sandwich concrete 9 is used to fill the cavity, that is, between the corrugated inner steel plate 5 and the corrugated outer steel plate 6. In the present invention, the sandwich concrete 9 can be filled only in the cavities of some of the concrete-filled double corrugated steel plate concrete composite tower barrel units 2 of the barrel section 1.

[0044] Circumferentially, adjacent concrete-filled double corrugated steel plate concrete composite tower barrel units 2 are connected into one body by prestressed bent bolts 3 to form a barrel section 1.

[0045] Vertically, adjacent barrel sections 1 are connected by an L-shaped flange 4 and high-strength bolts 12 to form a composite tower barrel.

[0046] According to the above structure, the corrugated steel plate can greatly increase the contact area with the concrete, and at the same time increase the steel content ratio of the cross-section of the tower barrel, so as to improve its bearing capacity. The overall stability and bearing capacity of the composite tower barrel obtained by this combination method are relatively high, and prefabrication in sections can ensure the construction quality and efficiency.

[0047] In one embodiment of the present invention, the corrugated inner steel plate 5 and the corrugated outer steel plate 6 are symmetrically distributed along the center of the cylinder wall section of the cylinder segment 1 and have the same curvature. They are respectively set at 50±5 mm from the inner and outer walls of the tower, and the corrugations are arranged vertically along the cylinder segment 1.

[0048] The distribution form of the corrugated inner steel plate 5 and the corrugated outer steel plate 6 of this embodiment can make the corrugated inner steel plate 5 and the corrugated outer steel plate 6 symmetrically distributed along the center of the cylinder wall section of the cylinder section 1 and have the same curvature, which is convenient for the arrangement of high-strength bolts 12. The high-strength bolts 12 are used to connect the corrugated inner steel plate 5 and the corrugated outer steel plate 6 to ensure the integrity of the corrugated inner steel plate 5 and the corrugated outer steel plate 6, so that the components are stressed together. The vertical arrangement of the corrugation better utilizes the accordion effect of the corrugated steel plate and has greater out-of-plane stiffness.

[0049] In one embodiment of the present invention, the waveforms of the corrugated inner steel plate 5 and the corrugated outer steel plate 6 are sinusoidal waveforms, the corrugations are wide corrugations, the crest length is twice that of the trough, the crest length can be 100mm to 300mm, the fold angle is 45 degrees to 60 degrees, and the ratio of wave height to wavelength is 0.1 to 0.2.

[0050] By using wide corrugations, the flexibility of the corrugated steel plate can be increased, the fatigue life can be extended, and the elastic stiffness of the wave can be greatly reduced, thereby improving the safety strength and stability. Better bearing capacity, ductility and energy dissipation capacity can be obtained, and the amount of steel used can be reduced while ensuring the performance of the tower, resulting in better economic performance.

[0051] In one embodiment of the present invention, the corrugated inner steel plate 5 and the corrugated outer steel plate 6 are both welded with studs 13, which are evenly arranged in the circumferential direction; the corrugated inner steel plate 5 and the corrugated outer steel plate 6 are evenly provided with reserved holes in the circumferential direction, and are connected by tension bolts 14; the studs 13 and the tension bolts 14 are arranged at intervals in the vertical direction.

[0052] In this embodiment, by arranging the studs 13, local buckling of the inner and outer steel plates can be prevented, and at the same time, the coordinated working ability of the corrugated inner steel plate 5, the corrugated outer steel plate 6 and the sandwich concrete 9 can be improved. The tension bolts 14 connect the corrugated inner steel plate 5 and the corrugated outer steel plate 6 to ensure the integrity of the corrugated inner steel plate 5 and the corrugated outer steel plate 6, improve the stability, and make the components bear the force together. The studs 13 and the tension bolts 14 are arranged at intervals along the vertical direction, so that the studs 13 and the tension bolts 14 are evenly distributed along the vertical direction, ensuring the connection between the corrugated inner steel plate 5 and the corrugated outer steel plate 6, improving the coordinated working ability of the steel plate and the outer concrete 8, and making the cross-section force uniform.

[0053] In one embodiment of the present invention, prestressed steel bar holes are provided inside the outer concrete 8, and prestressed steel bars 7 are arranged along the vertical direction of the barrel section 1 and are respectively anchored to the upper end plate 10 and the lower end plate 11 of the outer concrete-double corrugated steel plate concrete composite tower barrel unit 2.

[0054] In this embodiment, the prestressed steel bars 7 can keep the overall tower barrel in a compressed state, improve the flexural and crack resistance performance of the tower barrel, and ensure the stiffness and stability of the tower barrel.

[0055] In one embodiment of the present invention, on both sides of the concrete-filled double corrugated steel plate concrete combined tower barrel unit 2, there are square bolt grooves 15 for circumferential installation and connection of adjacent tower barrel units, and bolt holes are reserved in the bolt grooves.

[0056] In this embodiment, the setting of the square bolt grooves 15 provides construction space for the connection of the prestressed bent bolts 3 of adjacent concrete-filled double corrugated steel plate concrete combined tower barrel units 2. The square bolt grooves 15 can be constructed in the factory, and the connection is simple.

[0057] In one embodiment of the present invention, the outer concrete 8 can adopt ultra-high performance concrete, self-compacting concrete, etc., the sandwich concrete 9 is ordinary concrete, and the tower barrel can be flexibly designed from bottom to top according to requirements. The upper barrel section 1 can not be filled with the sandwich concrete 9, and can be filled only in the cavity of the concrete-filled double corrugated steel plate concrete combined barrel unit 2 of the lower barrel section 1 of the combined tower barrel, forming a concrete-filled double corrugated steel plate hollow concrete combined tower barrel. That is, one form of the present invention is to fill all the sandwich concrete 9, and the other form is solid at the bottom and hollow at the top.

[0058] This embodiment selects this method, which is mainly applicable to wind power tower barrels with relatively low structural heights. The advantage is that the upper barrel section 1 has relatively low requirements for bearing capacity, can not be filled with the sandwich concrete 9, can be flexibly designed according to the height of the tower barrel, can reduce the self-weight of the tower barrel structure, is convenient for hoisting, and improves the economic performance of the tower barrel.

[0059] In one embodiment of the present invention, the L-shaped flange 4 is welded by an annular connecting plate 16, an annular flange plate 17 and a rib plate 18. Reserved holes corresponding to the high-strength bolts 12 are provided on the annular flange plate 17. Each section of the L-shaped flange 4 is assembled in segments along the circumferential direction, and adjacent rib plates are welded.

[0060] Compared with the traditional connection method, only high-strength bolt 12 connection needs to be carried out on site, without welding operation and wet operation, and the construction is simple. The L-shaped flange is prefabricated in the factory, the end face is regular, the welding quality is good, the connection strength is high, the fatigue performance is good, the joint quality is easy to guarantee, and it has good stability and safety. The annular connecting plate 16 and the annular flange plate 17 are used for the connection of adjacent concrete-filled double corrugated steel plate concrete combined tower barrel units 2, and the rib plate 18 increases the flange stiffness and reduces the deformation of the flange joint.

[0061] In an embodiment of the present invention, the L-shaped flange 4 is respectively welded to the lower end plate 11 of the upper cylinder section 1 and the upper end plate 10 of the lower cylinder section 1, and connected by high-strength bolts 12. The high-strength bolts 12 can be replaced by ring groove rivets 19 of the same specification for connecting adjacent cylinder sections 1.

[0062] In the connection form of this embodiment, the tower barrel is connected circumferentially by prestressed bent bolts 3 and vertically by L-shaped flanges 4. Compared with the traditional grouting connection of concrete tower barrels, the construction period is shortened and the installation is convenient. The high-strength bolts 12 can be replaced by ring groove rivets 19 of the same specification, which have the advantages of large clamping force, stable performance, and good loosening prevention effect.

[0063] The construction steps of the concrete-filled double-corrugated steel plate concrete composite tower barrel of the present invention are as follows:

[0064] 1) Process the steel plates into corrugated inner steel plates 5 and corrugated outer steel plates 6 and perform rolling and bending, and process the L-shaped flange 4;

[0065] 2) Weld stud bolts 13 on the outer sides of the corrugated inner steel plate 5 and the corrugated outer steel plate 6 and connect them by tension bolts 14. Reserve prestressed steel bar holes and pour the outer concrete 8. Reserve square bolt grooves 15 at both ends, pour the sandwich concrete 9, weld the upper end plate 10 and the lower end plate 11, and tension the prestressed steel bars 7 to complete the construction of the concrete-filled double-corrugated steel plate concrete composite tower barrel unit 2. The L-shaped flange 4 is respectively welded to the lower end plate 11 of the upper cylinder section 1 and the upper end plate 10 of the lower cylinder section 1;

[0066] 3) Transport the prefabricated concrete-filled double-corrugated steel plate concrete composite tower barrel unit 2 to the site, connect it circumferentially by prestressed bent bolts 3, and connect adjacent cylinder sections 1 by L-shaped flanges 4 and high-strength bolts 12 to form a composite tower barrel.

[0067] In summary, the present invention proposes a concrete-filled outer - double corrugated steel plate concrete composite tower barrel and a construction method thereof, including barrel segments. The barrel segments are connected circumferentially by a plurality of concrete-filled outer - double corrugated steel plate concrete composite tower barrel units through prestressed bent bolts, and adjacent barrel segments 1 are tightly connected by L-shaped flange plates and high-strength bolts. The concrete-filled outer - double corrugated steel plate concrete composite tower barrel unit includes a corrugated inner steel plate, a corrugated outer steel plate, prestressed steel bars, outer concrete, sandwich concrete, upper end plates, and lower end plates. The corrugated steel plates are welded with stud bolts and connected by tie bolts. The present invention adopts a concrete-filled outer - double corrugated steel plate concrete composite tower barrel, which has good stability, high bearing capacity, and good anti-fatigue performance. The built-in corrugated steel plates increase the steel ratio of the cross-section compared with traditional concrete tower barrels. While improving the bearing capacity, the cross-sectional size of the components is reduced, and it has good ductility and energy dissipation capacity. By using prestressed steel bars, the bending resistance and crack resistance of the tower barrel are greatly improved, ensuring the stiffness and stability of the tower barrel. The tower barrel can be flexibly designed from bottom to top according to requirements. The upper barrel segment 1 can be not filled with sandwich concrete to form a concrete-filled outer - double corrugated steel plate hollow concrete composite tower barrel. The composite tower barrel is prefabricated in pieces, transported in pieces, and assembled on site, with good economy and high construction efficiency. It can greatly increase the height of the wind turbine tower barrel, meet the development requirements of low wind speed areas, and has good application prospects.

[0068] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel, characterized in that, It is composed of several barrel sections (1) joined vertically. The barrel sections (1) are connected circumferentially by multiple concrete - double - corrugated steel plate concrete composite tower barrel units (2) through prestressed bent bolts (3). The adjacent upper and lower barrel sections (1) are connected and fastened by L - shaped flange plates (4). The concrete - double - corrugated steel plate concrete composite tower barrel unit (2) includes a corrugated inner steel plate (5), a corrugated outer steel plate (6), prestressed steel bars (7), outer - wrapped concrete (8), an upper end plate (10), and a lower end plate (11). Among them, the corrugated inner steel plate (5), the corrugated outer steel plate (6), and the outer - wrapped concrete (8) form a cavity; there is a spacing between the corrugated inner steel plate (5) and the corrugated outer steel plate (6). Multiple stud bolts (13) are welded to both the corrugated inner steel plate (5) and the corrugated outer steel plate (6). The stud bolts (13) are evenly arranged circumferentially and extend into the outer - wrapped concrete (8); multiple reserved holes are evenly arranged circumferentially on the corrugated inner steel plate (5) and the corrugated outer steel plate (6), and they are connected by tie bolts (14); the stud bolts (13) and the tie bolts (14) are arranged at intervals vertically. Circumferentially, adjacent concrete - double - corrugated steel plate concrete composite tower barrel units (2) are connected into one body by prestressed bent bolts (3) to form a barrel section (1); the outer - wrapped concrete (8) is made of ultra - high - performance concrete or self - compacting concrete. Only the cavity of the concrete - double - corrugated steel plate concrete composite tower barrel unit (2) of the barrel section (1) at the lower part of the composite tower barrel is filled with sandwich concrete (9) to form a concrete - double - corrugated steel plate hollow concrete composite tower barrel, and the sandwich concrete (9) is ordinary concrete. Vertically, adjacent barrel sections (1) are connected by L - shaped flange plates (4) and high - strength bolts (12) to form a composite tower barrel.

2. The externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel according to claim 1, characterized in that, The corrugated inner steel plate (5) and the corrugated outer steel plate (6) are symmetrically distributed about the central axis of the barrel wall cross - section of the barrel section (1) and have the same radian. They are respectively arranged at 50±5 mm away from the inner and outer walls of the tower barrel, and the axial direction of the corrugations is arranged vertically along the barrel section (1).

3. The externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel according to claim 2, characterized in that, The waveforms of the corrugated inner steel plate (5) and the corrugated outer steel plate (6) are sine waveforms. The corrugations are wide corrugations. The length of the wave crest is twice that of the wave trough, the length of the wave crest is 100 mm - 300 mm, the folding angle is 45 degrees - 60 degrees, and the ratio of the wave height to the wavelength is 0.1 - 0.

2.

4. The externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel according to claim 1, characterized in that, Prestressed steel bar holes are arranged inside the outer - wrapped concrete (8). Prestressed steel bars (7) are arranged vertically along the barrel section (1), and the prestressed steel bars (7) are anchored to the upper end plate (10) and the lower end plate (11) of the concrete - double - corrugated steel plate concrete composite tower barrel unit (2).

5. The externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel according to claim 1, characterized in that, On both sides of the concrete - double - corrugated steel plate concrete composite tower barrel unit (2), there are square bolt grooves (15) for circumferential installation and connection of adjacent tower barrel units, and bolt holes are reserved in the bolt grooves.

6. The externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel according to claim 1, characterized in that, The L-shaped flange (4) is formed by welding an annular connecting plate (16), an annular flange plate (17) and a rib plate (18). The annular flange plate (17) is provided with reserved holes corresponding to high-strength bolts (12). Each section of the L-shaped flange (4) is assembled in segments along the circumferential direction, and the adjacent rib plates are welded.

7. The externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel according to claim 1, characterized in that, The L-shaped flange (4) is welded to the lower end plate (11) of the upper cylinder section (1) and the upper end plate (10) of the lower cylinder section (1) respectively, and is connected by high-strength bolts (12).

8. The construction method of the externally - wrapped concrete - double corrugated steel plate concrete composite tower barrel according to any one of claims 1 to 7, characterized in that, It includes the following steps: 1) The steel plate is processed into a corrugated inner steel plate (5) and a corrugated outer steel plate (6), and is bent, and the L-shaped flange (4) is processed; 2) Studs (13) are welded on the outer sides of the corrugated inner steel plate (5) and the corrugated outer steel plate (6) and are connected by tie bolts (14). Prestressed steel bar holes are reserved and the outer concrete (8) is poured. Square bolt grooves (15) are reserved at both ends, the sandwich concrete (9) is poured, the upper end plate (10) and the lower end plate (11) are welded, and the prestressed steel bars (7) are tensioned to complete the construction of the outer concrete-double corrugated steel plate concrete composite tower cylinder unit (2). The L-shaped flange (4) is welded to the lower end plate (11) of the upper cylinder section (1) and the upper end plate (10) of the lower cylinder section (1) respectively; 3) The prefabricated outer concrete-double corrugated steel plate concrete composite tower cylinder unit (2) is transported to the site and is connected along the circumferential direction by prestressed bent bolts (3). The adjacent cylinder sections (1) are connected by the L-shaped flange (4) and high-strength bolts (12) to form a composite tower cylinder.

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