Shenzhen Metro Line 3 passes through the Liberation Road section of Guangzhou - Shenzhen railway, underpinning should be carried out for the foundations of a continuous beam bridge and a continuous rigid frame bridge. The construction site features rich groundwater, limited space, poor geological conditions. Considering the difficulties of underpinning for the continuous beam bridge and continuous rigid pile bridge, the paper introduces the underpinning program, steps and treatment of the interaction of newly underpinned piles with overlapping tunnels, option for removing the old piles and construction monitoring requirements, and describes in-depth the auxiliary measures for underpinning and the major steps. The practice can be taken for reference by professional colleagues.%深圳地铁3号线穿越广深铁路解放路段,需要对该处连续梁和连续刚构桥墩进行托换.针对施工场地地下水丰富、场地狭小、地质条件差的特点,结合连续梁及连续刚构桩基托换难点、重点,介绍了整个托换方案、步骤、托换新桩与重叠隧道的相互影响和处理、托换旧桩破除方案以及对施工监测的要求,并对托换施工辅助措施和主要步骤进行了着重阐述.该项目目前已近成功实施,希望能为工程同行提供一定的借鉴.
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