A Virtual Erection System of Universal Rings for Shield Tunnels

The paper applies a method of multi-rings to determine positions of erection points of the universal rings,and to decide the correction lines based on the geometric features of the rings and the designed tunnel axis in shield tunnels.A virtual erection system of the rings is developed based on Unigraphics.The system is used to simulate the dynamic erection,manage data of ring erection and generate the report of the erection deviations.This system has been applied in a shield tunnel with giant diameter in Shanghai.The result verifies the usability of the system.