铁路跨度132m简支钢桁梁跨越既有铁路转体施工关键技术及应用

近年来,随着我国铁路路网密度日益增大,铁路立体交叉问题日益凸显。跨线桥梁施工会对既有铁路运营产生较大干扰,存在较高的安全风险。依托集包铁路古城湾特大桥1-132 m大跨度简支钢桁梁小角度跨越京包铁路工程实例,分析总结跨线桥施工方案确定原则、无平衡重平面转体关键技术及施工步骤、临近营业线施工安全防护措施,为类似桥梁工程的设计施工提供借鉴。该桥的成功转体证明大跨度简支钢桁梁小角度跨越既有铁路采用无平衡重平面转体法,能够确保营业线正常运营,降低施工安全风险,有效缩短施工工期,具有较好的经济效益及社会效益。

Key Technologies and Application of 132 m Span Steel Truss Girder Swivel Construction across Existing Railway

With the rapid development of railway infrastructure in recent years,the density of the railway network is significantly increased,which leads to the increasingly prominent problem of railway grade separation.For cross-line railway bridges,the bridge construction may cause greater interference to the operation of the existing railways and higher safety risks.This paper takes the 132 m large-span simple supported steel truss girder across the Ji’ning-Baotou Railway as the project example,analyzes and summarizes the principles for determining the construction plan of the cross-line bridge,the key technology and construction steps of unbalanced plane swivel scheme,and the safety protection measures for construction near the operating railway line,which can provide reference for the design and construction of similar bridge projects.The successful case of Ji’ning-Baotou Railway plane swivel bridge proves the applicability of unbalanced plane turning scheme in ensuring the normal operation of the business line,reducing construction safety risks,effectively shortening the construction period and achieving good economic and social benefits.