青藏线小南川1号桥铺设无缝线路分析

Analysis of Xiao-nanchuan river bridge in Qing-zang railway change seamless line

桥上无缝线路铺设时,除了要考虑轨道的强度及稳定性外,还必须考虑无缝线路与桥梁之间的相互作用。小南川1号桥为青藏线格拉段较有代表性的预应力钢筋混凝土T型梁曲线桥,在无缝线路设计中,需考虑高寒地区的气候条件,从桥上无缝线路伸缩附加力、挠曲力、断轨力及钢轨强度与稳定性入手,充分论证高寒地区桥上无缝线路铺设的安全性,并提出相应的施工方法及安全储备措施。

The seamless line on the bridge should considering track strength and stability,besides,it must considering the interaction between seamless and bridge.Xiao Nan-chuan 1# Bridge in the curve section which is a reinforced concrete T type beam bridge has representative of Qing-Zang rail line Ge-La section.The paper considering the alpine climate condition,and analysis the interaction of additional expansion and contraction forces, bending forces, broken rail forces and strength and stability,demonstration safety of seamless line in the alpine region,and supposed corresponding construction measures.