FCEC全回转拔桩技术在越江隧道地下清障中的应用
Application of the FCEC Fully-revolving Pile Pulling Method in Underground Obstruction Cleaning of the Longyao Road Cross-river Tunnel Project

上海龙耀路越江隧道江中段将穿越耀华玻璃厂老码头桩基群,在盾构推进前需对既有桩基进行拔除。通过各种拔桩方法的比选,针对工程特点,选用FCEC全回转拔桩技术。本文详细介绍FCEC工法的基本原理、优点和施工流程。拔桩过程中,防汛墙的最大沉降为6 mm,不均匀沉降为5 mm,均在安全范围内,证明FCEC全回转拔桩技术能在严格控制施工扰动的前提下快速完成拔桩清障工作。
The Longyao road cross-river tunnel will undercross the wharf piles foundation of the Yaohua glass factory, so some of the existing piles should be pulled out of the soil before the shield tunneling. After comparison of all pile pulling methods, considering the characteristics of this project, the FCEC method was selected. The basic principle, advantages, and construction flow are introduced, as well as the background of the project. During the process of pile pulling, the maximal settlement of the flood-control wall was 6 mm and the differential settlement was 5 mm, which met the security requirements. This construction practice provides reference to similar projects.