以新建兰渝铁路（兰州—广元）范家坪隧道标准双线隧道过渡到两分离式隧道燕尾段施工为例，从施工安全、施工质量、施工效益、施工工期4个方面对施工方案进行比选，重点介绍燕尾段由单线端挑顶反向施工技术，主副门架可变组合式液压台车台架配合小模板进行大跨段二次衬砌施工技术。整合施工资源，创造工作面，以缩短工期，确保安全、质量和效益。

Technology of roof ripping from the singletrack section and technology of lining construction for the largespanned section are presented in the paper, with the construction of the swallowtailshaped section of Fanjiaping tunnel on LanzhouChongqing railway as an example. In the end, satisfactoryresults are achieved. The paper can be served as reference for similar projects in the future.