88 m钢-混凝土组合桁架梁施工方案研究

摘要

临近既有线及在既有线上方施工一直是困扰施工单位的技术难题.本文以国内最大跨度的简支钢-混凝土组合桁架为研究背景,结合桥位处的自然地理特征和交通运输条件,提出了侧位现浇、拖拉横移落梁的施工方案,避免了支架搭设、拆除等大范围、长时间的既有线施工作业,减少了对既有繁忙铁路干线的影响,降低了大型临时设施的施工投入,对同类工程具有参考和借鉴意义.%Construction near and above the existing railway has been a technical problem plaguing the construction company.Taking the longest span simply supported steel-concrete composite truss as the research background in this paper,combined with the natural geographical features of the bridge site and transportation conditions,the construction scheme was proposed by using the method of lateral cast-in-place and incremental launching beam.The scheme can avoid a wide range and long time scaffold erection and dismantling for the existing railway construction, reduce the impact on the existing busy railway and the investment for large temporary facilities.It has reference for similar engineering.