安庆长江铁路大桥主桥桥塔施工关键技术

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1、桥梁建设2013年第43卷第3期(总第220期)BridgeConstruction，Vo1．43，No．3，2013(TotallyNo．220)文章编号：1003—4722(2013)03—0031—06安庆长江铁路大桥主桥桥塔施工关键技术刘爱林，王剑峰(中铁大桥局宁安铁路安庆长江大桥工程指挥部，安徽安庆246008)摘要：安庆长江铁路大桥主桥为双塔三索面钢桁梁斜拉桥，桥塔为上倒Y形、下钻石形混凝土结构，高210m。根据该桥塔超高、截面大且设置双层主筋的特点，塔座及下塔柱底节8．5m采用现浇模板支架法施工，其余均采用6m节段液压爬模施工；横梁采用

2、钢管柱支架法、分2层与塔柱结合段同步施工；上塔柱节段采取塔梁同步技术施工。施工时，在塔柱内设置劲性骨架，改进液压爬模系统，在中塔柱两塔肢间设4道钢管横撑；合理配置机械设备，采取大体积混凝土施工工艺控制技术；并采取桥塔线形测量控制等措施确保了施工安全和质量。该桥塔已于2012年9月l4El施工完成。关键词：铁路桥；斜拉桥；桥塔；爬模施工；大体积混凝土；施工技术中图分类号：U448．27；U445．4文献标志码：AKeyTechniquesforConstructionofPylonsofMainBridgeofAnqingChangjiangRiver

3、RailwayBridgeLIUAi—lin，WANGJian-feng(ConstructionHeadquartersofAnqingChangjiangRiverBridgeonNanjing—AnqingRailway，ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Anqing246008，China)Abstract：ThemainbridgeofAnqingChangjiangRiverRailwayBridgeisasteeltrussgirdercable—stayedbridgewi

4、thdoublepylonsandtriplecableplanes．Thepylonsofthebridge，eachbe—ing210mhigh，aretheconcretestructuresintheshapeofinvertedYattheupperpartsandofdi—amondatthelowerparts．Inthelightofthecharacteristicsthatthepylonsareveryhigh，thesec—tionsofthepylonsarelargeandarelaidoutwithtwolayersof

5、mainreinforcement，thebasesofthepylonsandthe8．5mbottomsegmentsofthelowerpyloncolumnswereconstructedbythemethodofcasting——in——situformworkandscaffoldingswhiletherestpartsofthepyloncolumnswereconstructedbythehydraulicclimbingformworkineach6msegment．Thecrossbeamsofthepylonswerecons

6、tructedineachtwolayerssynchronouslywiththejointsectionsofthepyloncolumns，usingthemethodofsteelpipepostscaffoldingsandthesegmentsoftheupperpyloncolumnswereconstructed，usingthetechniqueofsynchronousconstructionofthepylonsandgirder．Intheconstruction，thesteelframedskeletonswereseti

7、nthepyloncolumnstoimprovethehydraulicclimbingsystem．Inbetweenthetwomiddlepyloncolumnsofapylon，4temporarysteelpipecrossbracingswereset．Themachineryandequipmentwererationallydeployed，theconstructiontechnologycontrolmeasuresforthemassiveconcreteandthegeometricshapesurveyandcontrol

8、measuresforthepylonsweretakentofinallyensuretheconstru