Manufacturing method and technical realization elements of circular cross-section concrete supporting structure of prefabricated wind turbine

Technical realization elements:

4. Technical problem: The utility model provides a circular cross-section concrete support structure for assembled wind turbines that can effectively enhance the integrity and improve the construction efficiency.

5. Technical solution: A circular cross-section concrete support structure for a fabricated wind turbine, which is composed of several identical structural units. The structural units include a concrete tower section, an upper flange, a lower flange, and multiple upper flanges. The longitudinal steel bars connecting the flange and the lower flange, multiple high-strength bolts, the upper prestressed steel strand located at the upper part of the structural unit, and the lower prestressed steel strand located at the lower part of the structural unit. The upper flange, the lower flange and the longitudinal steel bars are integrally cast, and the upper flange and the lower flange are reserved with double rows of evenly distributed bolt holes. The concrete tower section is poured between the upper flange and the lower flange, and the longitudinal steel bars are wrapped inside.

6. Further, at the top and bottom of the concrete tower section are reserved upper prestressed holes and lower prestressed holes penetrating through the cross section, which are used to penetrate the upper prestressed steel strands and the lower prestressed steel strands, respectively , The upper prestressed steel strand and the lower prestressed steel strand are pre-stressed with a certain initial prestress. An upper groove and a lower groove are reserved in the middle of the upper prestressed tunnel and the lower prestressed tunnel, which are used to anchor the upper prestressed steel strand and the lower prestressed steel strand, respectively.

7. Further, the structure includes a plurality of structural units connected in a horizontal direction by prestressed steel strands to form a circular cross section.

8. Further, the structure includes a plurality of structural units connected in a vertical direction by high-strength bolts in the flange plate.

9. Further, after a plurality of structural units are connected to each other in the horizontal direction and the vertical direction, an integral tower tube with gradually smaller circular cross section from bottom to top is formed.

10. Beneficial effects: Compared with the prior art, the utility model has the following advantages:

11.(1) This utility model adopts the fully dry connection mode of flanges with high-strength bolts and prestressed steel strand hoop, which greatly improves the efficiency of on-site assembly. The wet connection using grouting material needs to wait for it to reach a certain strength before proceeding to the next section of hoisting. The on-site installation efficiency is low, and the construction will be interrupted due to the difficulty of improving the strength during winter construction. The utility model realizes the connection of the horizontal seam and the vertical seam through flange bolts and circumferential prestressed steel strands, and the assembly efficiency is greatly improved.

12.(2) The utility model adopts the integrated casting of flange and longitudinal steel bars, which reduces the requirement of machining accuracy and eliminates the link of on-site levelness adjustment. The height-to-width ratio of the tower is very different, and the dry connection is often difficult to construct due to the poor levelness of the prefabricated components, and it takes a lot of time to polish on site to adjust the levelness. The utility model integrally casts the longitudinal steel bars and the flanges, and uses the longitudinal steel bars to fix the spacing and levelness of the upper and lower flanges, so that the precision of the prefabricated components is higher.

13.(3) The utility model can effectively enhance the survivability of the tower structure under extreme disasters. The section bending moment of the tower tube due to the large height is also very large. When adjacent sections are not connected by steel bars at the joints, the ductility and energy consumption of the joints under extreme disasters such as earthquakes and typhoons are low. Irreversible brittle damage is prone to occur, difficult to repair and easily cause the collapse of the tower. The utility model can not only make the concrete in the tower section be in a circular compression state, but also enable the steel bars in the tower section to participate in energy consumption, which greatly improves the overturning resistance of the tower support structure under extreme disasters.

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