Analysis On Mechanics Of Full-face Shield Cutting Bridge Pile Foundation And Construction Control Technology

It will inevitably encounter obstacles in the subway construction. Only by shield cutting directly bridge pile foundation in the condition of no change the line. Suzhou Metro Line 2 need cut 14 reinforced concrete bored pile to passes through the Guangji Bridge before they can reach the road station.This paper briefly analyses the background and significance of shield cutting pile. Combined with the cases of typical cutting pile shield at home and abroad, By comparison of alternative types of shield machine, bridge pile foundation and engineering geological conditions, we formulated the construction plan for field geological and hydrological conditions.The article will discuss the effect of cutting pile foundation of bridge by shield on security of bridge and segment. Combined the calculations of the effects of bridge foundation, foundation bearing capacity and reasonable base eccentricity and the bearing capacity of the bottom layer. We obtain the stability of the foundation of bridge. Repairs are necessary to strengthen pier 1 and this paper list the reinforcement scheme; After calculating reinforcement and analysing stress of the segment in the special section, we verified the safety of segment is in line with the standard or not.In order to guarantee the safety of existing structures and tunnel, on the one hand. It is need to reform the shield machine, including the shield cutter, screw conveyor, Outsourcing tube. The transformation has played a key role on success of cutting pile; On the other hand, it is the control to synchronous grouting construction.At the same time of shield cutting pile foundation, there must be monitoring of bridge pier surface around the tunnel line timely. Combined with the monitoring results and the change curve of propulsive parameter of shield machine, we can take controlling measures to ensure the security of the working condition of engineering safety in shield through each line of pile foundations, such as shield machine modification, synchronous grouting and solution of problems.