临近既有线深基坑开挖施工

摘要

Necessary protective measures must be taken for the deep pit excavation construction near the existing line to ensure the safety of the existing line.This paper takes the south approach bridge of the new Qiantang River railway bridge as example.The project adopts the Ⅳ type of Larsen steel sheet pile as protection.A computational model by using the "rationale for deep foundation 5.3 supporting protection software" is established for checking,and timely monitoring of the horizontal displacement of the protecting piles to ensure the traffic safety of the existing line from the beginning of the pit excavation to the backfill acceptance check.%临近既有线深基坑开挖施工必须采取必要的防护措施确保既有线行车安全。以钱江铁路新桥南引桥为例,该工程基坑采用拉森Ⅳ型钢板桩进行防护,建立计算模型采用＂理正深基坑5.3支护软件＂检算,并从基坑开挖开始到回填验交为止定时监测位移,以确保既有线行车安全。