Abstract: To solve technical problems faced in the construction of underground spaces in urban areas with large building density and limited space, new excavation equipment, shaft excavation and sinking technology, segment structure design, and waterproof technology are introduced, and an assembled shaft construction technology based on the Herrenknecht vertical sinking shaft machine(VSM) is proposed. The assembled VSM was first applied in the sinking shaft parking project (phase Ⅰ) in the Jianye District of Nanjing. The method is shown to be efficient with a smaller footprint. The engineering practice shows that: (1) The mode of overexcavation combined with selfweight sinking ensures a controllable sinking process. (2) Bentonite mud plays a better role infriction reduction and wall protection. (3) The whole ring is divided into six equal segments. Therefore, all segments are the same for the shaft, which helps to significantly improve the efficiency and quality of the construction. This method has promising applications in underground parking garages, shield jacking shafts, metro ventilation shafts, etc.

Key words:  , assembled shaft, vertical sinking shafe machine, sinking shaft, segment structure, underground parking garage