Abstract:

The jacking experiment is carried out on pipecurtain group with inner interlock joints adjacent to Tianlinlu Project in Shanghai crossing underneath pipe curtainbox culvert section, so as to study the feasibility and safety of inner interlock joints. The curtain pipe stiffness, interlock stiffness and curtain pipe jacking sequence, jacking excavation and attitude controlling technology, and jacking lubrication and jacking force control are studied by numerical simulation method. The experiment and simulation results show that: (1) With the help of inner interlock joints, the accurate attitude control, smooth curtain pipe closure, and good water proofing performance can be guaranteed. (2) The curtain pipes with inner interlock joints have sufficient stiffness. (3) The boring machines, deviation controlling system and backup system adopted can precisely control the pipe curtain jacking with axis deviation within ±1 cm. (4) The inner interlock joints have effective guiding effect in the experiment.

Key words: pipecurtain group, inner interlock joints, ANSYS numerical simulation, attitude controlling technology, stiffness