河南科技HenanScienceandTechnology交通与土木工程总798期第4期2023年2月高速上跨铁路立交主桥施工技术研究李烨（中铁西安勘察设计研究院有限责任公司，陕西西安710054）摘要：【目的】本研究对延安东绕城高速公路上跨包西铁路、西延高铁立交工程主桥施工技术开展系列探讨。主桥桥型为2×70m预应力混凝土变截面箱型T型钢构桥，整幅设置，整幅宽33.6m。【方法】主桥T构梁采用转体法浇筑。该桥主梁为单箱四室双斜腹梁的单元截面；主墩为空心桥墩,单箱双室散射截面大；该桥采用单墩式转体制，转体系统包含下转盘、中铰、上转盘、转体牵引装置等构造。对主梁、主墩、转体结构采用MidasCivil程序和MidasFEA进行计算。【结果】计算结果显示其所有技术指标都符合标准要求。【结论】该桥的施工方案结构设计合理、经济性好，尽可能地保证了其施工期间铁路轨道的安全运营。关键词：T构桥；上跨铁路；转体系统；施工方案中图分类号：U418.8文献标志码：A文章编号：1003-5168（2023）04-0067-04DOI：10.19968/j.cnki.hnkj.1003-5168.2023.04.014StudyonConstructionTechnologyofMainBridgeofHighSpeedOverpassRailwayLIYe(ChinaRailwayXi′anSurveyandDesignInstituteCo.,Ltd.,Xi′an710054,China)Abstract:[Purposes]ThestudyaimstocarryoutaseriesofdiscussionsontheconstructiontechnologyofthemainbridgeofYan′anEastRingExpresswaycrossingBaoxiRailwayandXiyanHigh-speedRail⁃way.Themainbridgeisa2×70mprestressedconcretevariablecross-sectionboxT-shapedsteelstruc⁃turebridge,withthewholewidthof33.6m.[Methods]TheT-beamofthemainbridgewaspouredbytherotationmethod.Themaingirderofthebridgeistheunitsectionofthesingle-boxfour-celldouble-obliquewebbeam;themainpierisahollowpier,andthesingle-boxdouble-chamberscatteringcrosssectionislarge;thebridgeadoptsasingle-pierrotationsystem,andtherotationsystemincludesalowerturntable,amiddlehinge,anupperturntable,andarotationtractiondevice.Themaingirder,mainpierandswivelstructurearecalculatedbyMidasCivilprogramandMidasFEA.[Findings]Thecalculationresultsshowedthatallthetechnicalindexesmetthestandardrequirements.[Conclusions]Thestruc⁃turaldesignoftheconstructionschemeofthebridgeisreasonableandeconomical,andthesafeopera⁃tionoftherailwaytrackduringth...
