湿陷性黄土条件下箱形桥顶进施工技术

Construction Technology of Box Bridge Jacking Under the Condition of Collapsible Loess

结合城区市政道路下穿既有铁路顶进箱形桥施工实例,在湿陷性黄土地基、D梁长度选择受曲线半径影响、既有接触网杆影响、施工天窗点及慢行时间受限、工期紧张等不利因素下,经过施工方案优化在确保行车安全的前提下,进行的双孔分体箱形桥顶进施工技术,可为类似工程借鉴。

Combined with the construction example of city municipal road passing beneath the existing railway by jacking box bridge, the paper makes an optimization of the construction scheme under several unfavorable factors, such as the collapsible loess foundation, the selection of D beam length influenced by the curve radius, the influence of the existing catenary poles, limited time for construction skylights and slow driving as well as time constraints for the project. Then, the construction technology of double-hole splitting box bridge jacking was carried out and the driving safety was ensured. It could provide a reference for similar projects.