跨既有线预制梁架设施工技术

Construction technology of pre-casting beam which spanning present line

结合工程实例，介绍了架梁的工艺流程，关键施工技术及架梁方案，从架桥机过孔、运梁作业、加梁过程论述了跨既有线预制梁架设施工技术，提出了安全技术措施。

Combined with specific engineering, it introduces process flow,key construction technology and plan of frame beam, discusses construction technology of pre-casting beam which spanning present line from bridge machine passing hole,carrying beam and erecting beam, and puts forward safety measures.