滨海软土地区临近运营高铁框构桥顶进施工技术

Jacking Construction Technology of the Frame Bridge over High Speed Railway in Costal Soft Soil Areas

框构桥顶进施工工艺要求的顶进降水和开挖土体卸载势必造成地表沉降。而高铁对沉降要求极高,因此临近运营高铁顶进施工与保证高铁的运营安全相互制约。结合天津武清翠亨路临近高铁顶进铁路立交桥工程,按照顶进过程分阶段分析,采取注双液浆预加固路基、调整开挖土方顺序,同时对止水帷幕采用观测井、回灌井等监控措施,以及在防"扎头"、防偏位、防土体坍塌、后补底板和后补刃脚施工上进行创新,保证京津城际的安全运营,为以后类似工程提供了参考依据。

The jacking construction of the frame bridge which needs dewatering and evacuation usually cause ground subsidence, but the ground subsidence of high speed railway is very demanding and there is a mutual restriction between its jacking construction and safe operation. In the jacking construction of the frame bridge overpass on Cui Heng road in Wuqing, Tianjin, by analyzing the different jacking stages, some measures like consolidating the road bed with double injection, adjusting the order of evacuation Meanwhile, we used observation well and inverted well to monitor the water-stop curtain, and made innovation in displacement prevention, soil collapse prevention, bottom board and cutting edge construction, which ensured the safe operation of the high speed railway between Beijing and Tianjin, and also would provide reference for similar projects.