Abstract:Aiming at the construction challenges of the ultra-deep pipe jacking shaft in the central urban area with dense buildings and limited working spaces, the application of the automated tunneling process for suspended prefabricated shafts (SPS) in the trenchless pipe jacking field is introduced. This process stabilizes the prefabricated and assembled shaft body through a suspended sinking system and uses a multi-angle rotating cutter head blade in conjunction with a twisting suction system for fully automatic underwater excavation. Compared with the traditional processes, it requires a smaller construction site, is more efficient, and is more environmentally friendly and low-carbon. The engineering practice shows that the construction technology of prefabricated shafts has a high degree of automation, and the sinking of shafts is autonomous and controllable. The shaft is assembled with prefabricated pipe segments, highly improving the efficiency and quality of on-site construction. And the tunneling and sinking are carried out in an undrained form, which can effectively control the instability risk of the excavation face and the surrounding settlement.
