市政框构桥施工对高铁高架桥的影响分析

Analysis on the influence of municipal frame bridge construction on high speed railway viaduct

为了得到市政框构桥施工对高铁高架桥桥墩变形、桥桩内力的影响规律,依托北京新机场高速公路地下综合管廊下穿京沪高铁框构桥工程,通过分析监测数据,得出了框构桥在不同施工阶段过程中桥墩的变形规律及最大变形值,采用三维数值方法,分析了框构桥下穿高铁高架桥施工过程中桥墩的变形规律及桥桩内力的变化,并与监测数据进行对比分析,结果表明:数值模拟计算结果与实测数据基本吻合,合理的设计及施工方案能有效减小框构桥施工对高铁高架桥的影响。

In order to get the influence law of municipal frame bridge construction on pier deformation and pile internal force of high-speed railway viaduct, based on Beijing New Airport Expressway underground pipe gallery crossing Beijing Shanghai high-speed railway frame bridge project, through the analysis of monitoring data, the deformation law and maximum deformation value of pier in different construction stages of frame bridge are obtained. In this paper, three-dimensional numerical method is used to analyze the deformation law of piers and the change of pile internal force during the construction of frame bridge under high-speed railway viaduct, and the results are compared with the monitoring data. The results show that the numerical simulation results are basically consistent with the measured data, and the reasonable design and construction scheme can effectively reduce the influence of frame bridge construction on high-speed railway viaduct.