Abstract:  To improve the efficiency and safety of vertical shaft construction, a vertical shaft sinking mahine (VSM) is adopted. A case study is conducted on the caissontype parking facility construction project (Phase 1) in Jianye district, Nanjing, China, and the design concept of prefabricated shaft concrete segment structure for shaft is systematically introduced, including structure detail and size, segment joint, mechanical analysis, and waterproof design. Then, the segment structure is optimized and the design concept of the universal segment is first proposed in the VSM project. The whole ring is devided into six equal segments to improve the efficiency and quality of construction significantly. The field application results show that the circular shat segment has a good stress state with good waterproofing capacity.

Key words: assembled shaft, vertical shaft sinking machine, prefabricated segment, universal segment, structural design