Abstract:

The shield tail brush replacing process of Komatsu shield machine used in Nanjing Metro Line 3 is analyzed according to the characteristics of shield machine and geological conditions. Conclusions drawn are as follows: 1) The determination of stopping position of shield machine according to thrusting conditions is very important. The effective sealing of shield tail is important to burst replacing. 2) The full recovering of the segment can be guaranteed by means of whole ring moving of the segment. 3) The using life of shield tail brush can be extended by choosing good-quality shield tail brush and shield tail brush grease and rational thrusting parameters in long distant soft and weak waterrich stratum.

Key words: Komatsu shield machine, fine silty sand, shield tail brush replacing