Such as water drain hole drilling,squeezing prevention ditch digging, observation point setting,squeezing rate controlling,according to different area different environment put forward rational pile squeezin.

Described are motion process of the automatic doors on the train, the four schemes for the control of the extrusion prevention function as well as control principles.

According to a successful example of silent piling under high pressure ,this paper indicates that with the develepment of the high-energy silent piling machines and the effective anti-squeezing measures, there is a hope to reuse the reliable and economical precast concrete pile in the downtown area of Shanghai.