某新建铁路下穿京津城际铁路的连续板桥设计及安全分析

Design and Safety Analysis of Continuous Slab Bridge of Newly Built Railway underneath to Pass Beijing-Tianjin Intercity Railway

按照目前高速铁路的相关规定,新建工程与建成后的高速铁路交叉时,原则上应采取新建工程下穿既有高速铁路的建设方案。以下穿净高受限的既有高速铁路桥梁为切入点,采取能够有效降低桥梁高度的中小跨度连续板桥下穿既有高速铁路桥梁。从结构设计、安全评估和施工、运营期间的变形监测等方面深入分析了新建桥梁对既有高速铁路桥梁的影响,研究成果可作为其他同类工程的设计参考。

According to the relative stipulations of high-speed railway now,the construction scheme for the newly built project to intersect with the built high-speed railway should be the newly built project underneath to pass the existing high-speed railway in principle.Taking the limited net height of the existing high-speed railway bridge as an entry point,the small-span and middle-span continuous slab bridges able to efficiently reduce the bridge height are used underneath to pass the existing high-speed railway bridges.The article further analyzes the influence of the newly built bridges on the existing high-speed railway bridges from the aspects of structural design,safety evaluation,and deformation monitoring in construction and operation periods.The study result can be referred for the design of the other similar projects.