马鞍山长江公铁大桥主航道桥边辅跨钢桁梁顶推施工关键技术  

Key Incremental Launching Techniques of Steel Trusses in Side Spans of Main Navigation Channel Bridge of Maanshan Changjiang River Rail-cum-Road Bridge

作　　者：秦体豪 QIN Tihao(Hefei Railway Hub Project Construction Headquarters(Ning′an Railway Co.,Ltd.),China Railway Shanghai Group Co.,Ltd.,Hefei 230011,China)

机构地区：[1]中国铁路上海局集团有限公司合肥铁路枢纽工程建设指挥部(宁安铁路有限责任公司),安徽合肥230011

出　　处：《世界桥梁》2024年第4期35-41,共7页World Bridges

摘　　要：马鞍山长江公铁大桥主航道桥为(112+392+2×1 120+392+112) m三塔三索面钢桁梁斜拉桥,Z1号墩至Z3号塔之间的边辅跨钢桁梁长504 m,分为19个施工节段采用顶推法施工,节段总重26 446.73 t。合理设置顶推施工大临结构,优化架梁起重机和节点式自动顶推系统,在顶推过程中对钢桁梁线形进行监测和纠偏,监测钢桁梁、钢导梁、临时墩及墩旁托架应力与沉降变形,确保钢桁梁顶推各项性能满足规范或计算限值要求;通过对架梁起重机、顶推系统及临时墩监测关键数据的实时采集分析,驱动BIM模型进行数据控制和全过程数字孪生,实现了变高空操作为平地操作。采用MIDAS Civil软件对钢桁梁顶推施工控制工况进行有限元分析,结果表明钢桁梁与大临结构的强度、刚度及稳定性满足要求。The main navigation channel bridge of Maanshan Changjiang River Rail-cum-Road Bridge is a three-pylon cable-stayed bridge with spans(112+392+2×1120+392+112)m.The stay cables are arranged in three cable planes.The superstructure consists of steel trusses,where the superstructure between piers Z1 and Z3 measures 504 m long,which are divided into 19 segments and erected by incremental launching,with a total weight reaching 26446.73 t.Temporary structures were installed to facilitate the incremental launching construction,the gantry cranes and nodal-type automatic incremental launching system were optimized,and the alignment of the steel trusses were monitored and adjusted during the incremental launching process.The stresses and deformation of the steel trusses and launching nose as well as the settlements of the auxiliary piers and pier-side scaffolds were monitored to ensure that the parameters of the steel trusses could meet the code requirements and agree well with the calculated limit values.BIM model was established based on the key real-time data of the gantry crane,incremental launching system and temporary piers,and a full-process digital twins was applied,to transform the overhead operation to land operation.The incremental launching process of the steel trusses were numerically simulated in MIDAS Civil.The results show that the strength,stiffness and stability of the steel trusses and large temporary structures met the code requirements.

关 键 词：斜拉桥 钢桁梁 顶推施工 架梁起重机 钢导梁 有限元分析 数字孪生 施工技术 

分 类 号：U448.211[建筑科学—桥梁与隧道工程] U445.462[交通运输工程—道路与铁道工程]