临近既有桥紫金街顶进框架桥涵下穿铁路平改立工程设计

Frame Bridge and Culverts Design of Zijin Street Close to An Existing Bridge for Jacking-in Turning Grade Crossing into Grade Separation

铁路顶进框架桥涵是解决下穿铁路的最佳途径,本文通过工程实例,阐述在营业铁路线上临近既有桥进行平交改立交工程中的铁路框架设计技术问题。在提出下穿框架桥设计原则的基础上,对临近既有桥顶进框架桥结构设计、顶力计算、工作坑、后背、滑板、铁路线路加固和排降水等设计关键技术作了介绍,为类似的下穿工程提供借鉴。

A railway jacked-in frame bridge and culvert is the best way to solve under-passing existing railways. Combined with one of our contracting engineering examples, this article elaborates on the railway framework design technology close to an existing bridge for jacking-in turning grade crossing into grade separation on business railway lines. On the basis of design principles for under-passing frame bridges, this paper introduces key technologies on jacking frame bridge structure ad- jacent to existing bridges, jacking force calculation, working pit, back, sliding plate, reinforce railway track, the founda- tion pit draining, etc. , so as to provide references for similar under-passing projects.