地铁暗挖隧道近距离穿越桥桩施工技术

Construction Technology of a Subway Tunnel Closely Passing through Bridge Piles

随着我国地铁建设的快速发展,地铁隧道穿越既有桥梁、建筑物等工程日益增多,此类工程中对桥梁、建筑物的沉降控制要求严,安全风险大,一旦发生事故,经济损失巨大,社会负面影响严重。通过模拟计算和沉降分析可事先得到沉降控制曲线,在实施过程中,将监测数据与模拟计算数据进行比较,并根据监测信息及时调整施工部署,在未主动对桥梁采取顶升技术的条件下,通过长台阶、快封闭、上导洞等施工措施保证施工安全,并最大限度减少暗挖施工对桥梁及地面建筑物的影响,可有效控制沉降、节约投资,为地铁暗挖隧道近距离穿越桥桩及其他建筑物积累经验。

With the rapid development of China subways, projects of subway tunnels passing through existing bridges and buildings are increasing. Settlement control requirements of bridges and buildings of such projects are strict and there exist security risks. If an accident happens, huge economic losses and serious negative social impact will be caused. In one project of interest, settlement control curve was obtained by simulation and settlement analysis at first. Then in the construction process, the deployments were adjusted according to monitoring data after monitoring data and simulation data were compared. Construction measures, such as top headings, long benches and fast closure of section were adopted without jacking the bridge, which ensured construction safety and minimized the impact of the under - passing tunnel on bridges and surface buildings. The practice not only controlled the settlement effectively and saved investment, but also helped to accumulate experience for subway tunnel passing closely through bridge piles and other buildings.