The invited report delivered at the 9th National Structural Engineering Conference focused on the construction of the Shenzhen SEG Plaza, a super high-rise building utilizing concrete-filled steel tube (CFST) structures. The presentation, led by Su Shimei from China Construction Engineering Bureau in Beijing, highlighted innovative technologies and methods that were developed and implemented during the project's construction. These included top-down construction techniques, comprehensive CFST construction methods, high-throwing, vibration-free, and self-compacting concrete technology, as well as the application of unsupported hanging forms for stiff concrete floors, tool-type overall lifting formwork for core-tube elevator shafts, and cold extrusion connection techniques for thick steel bars.
The project also incorporated advanced materials such as permeable rigid waterproof technology for underground and outdoor walls, and an automatic temperature measurement computer control system for mass concrete. These innovations significantly contributed to the high-quality, high-level, and fast-paced construction of SEG Plaza.
Shenzhen SEG Plaza, a modern, multi-functional, and intelligent super high-rise building, is designed with a focus on high-tech electronic markets, integrating office, exhibition, trade, financial, securities, and entertainment spaces. The building spans 72 floors above ground, reaching a height of 353 meters, with a total construction area of 166,700 square meters. Its structural system combines a frame-tube structure with steel tube concrete columns and steel beams, creating a strong and stable anti-lateral force system.
The construction process involved the use of reverse construction techniques for the basement, which allowed for efficient and safe excavation while minimizing risks to surrounding structures. This method also helped optimize site utilization, especially in areas with limited space. Additionally, the project employed advanced crane systems, including internal climbing tower cranes, to handle the complex steel structure installation at great heights.
The steel structure of SEG Plaza presented unique challenges due to its frame-tube configuration, with the inner core using steel tube concrete columns instead of traditional reinforced concrete. This required precise measurement and alignment, as well as specialized welding and bolting techniques for beam-column connections. The use of high-throwing and vibration-free self-compacting concrete was another key innovation, ensuring high-quality core concrete filling without mechanical vibration.
Throughout the project, extensive testing and monitoring were conducted to evaluate the performance of the CFST columns, beam-column joints, and structural elements under various loads. These tests provided valuable data on strain, deformation, and stress distribution, contributing to a better understanding of the behavior of such structures under real-world conditions.
Overall, the successful completion of SEG Plaza demonstrated the effectiveness of advanced construction technologies and the importance of careful planning, coordination, and innovation in the development of super high-rise buildings. The lessons learned from this project continue to influence the future of structural engineering and high-rise construction.
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