浅谈新建跨线铁路桥梁T构设计及转体施工

新建铁路桥跨越既有铁路施工时,面临影响既有铁路运营安全的工程难题。为避免干扰既有铁路运营,加快施工进度,文章结合某铁路专用线的疏解线上跨既有兰新铁路的工程案例,提出主桥采用(2×34)mT构,先平行于既有兰新铁路现浇施工,再转体就位的施工方法。并结合桥位特点,采用三维有限元计算方法进行了T构结构计算和施工阶段分析,阐述了T构转体施工的工艺流程和关键控制因素,可为类似工程提供参考借鉴。

Discussion on T-Structure Design and Swivel Construction of New Cross-line Railway Bridges

The construction of the new railway bridge crossing over the existing railway will affect the operation safety of the existing railway.In order to avoid disturbance of the construction to the operation of the existing railway and accelerate the construction progress,combined with the engineering case of untwining line of the special railway line across the existing LanXin Railway,it is proposed that(2×34)m T-structure should be adopted for the main bridge,which is parallel to the existing LanXin Railway with cast-in-place construction and then swivelled into place.Combined with the characteristics of the bridge location,the three-dimensional finite element method is used to calculate the T-structure and analyze the construction stage.The technological process and key control factors of the T-structure swivel construction are expounded,which can provide reference for similar projects.