大跨度钢箱梁斜拉桥施工控制_岳青

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1、桥梁建设2013年第43卷第4期(总第221期)54BridgeConstruction，Vol．43，No．4，2013(TotallyNo．221)文章编号:1003－4722(2013)04－0054－07大跨度钢箱梁斜拉桥施工控制岳青，严和仲，阙水杰，刘华，秦照付(中铁大桥勘测设计院集团有限公司，湖北武汉430050)摘要:为保证厦漳跨海大桥北汊主桥(主跨780m的双塔双索面半飘浮体系钢箱梁斜拉桥)成桥后内力和线形满足设计要求，采用以无应力状态法为理论基础的施工控制方法，考虑结构非线性，进行参数识别和平差计算，根据桥梁结构特点确定合理的成桥及施

2、工阶段状态，对该桥进行施工控制。在施工控制中利用无应力夹角确定钢箱梁现场安装位置，利用索长拔出量快速确定张拉索力，并根据大桥结构特点及温度变化情况，采用单侧顶推为主、配切为辅的中跨合龙方案，有效地控制了合龙风险。通过全面严格的施工控制，厦漳跨海大桥北汊主桥实现了高精度顺利合龙，桥梁线形及内力均符合设计要求。关键词:斜拉桥;钢梁;箱形梁;无应力状态控制法;中跨合龙;有限元法;施工控制中图分类号:U448．27文献标志码:AConstructionControlofLongSpanSteelBoxGirderCable-StayedBridgeYUEQin

3、g，YANHe-zhong，QUEShui-jie，LIUHua，QINZhao-fu(ChinaＲailwayMajorBridgeＲeconnaissance＆DesignGroupCo．，Ltd．，Wuhan430050，China)Abstract:Toensurethattheinternalforceandgeometricshapeofthecompletednorthmainbridge(asemi-floatingsystemsteelboxgirdercable-stayedbridgewithdoublepylons，double

4、cableplanesandwithaminspan780m)oftheXiazhangSea-CrossingBridgecouldmeetthedesignrequirements，theconstructioncontrolofthebridgewascarriedout，usingthecontrolmethodbasedontheunstressedstatemethodtheory，theparameteridentificationandadjustmentcalculationthatconsideredthestructuralnon

5、-linearityandalsotherationalcompletedbridgeandconstructionstagestatedeterminedaccordingtothestructuralcharacteristicsofthebridge．Intheconstructioncontrol，theunstressedincludedangleswereusedtodeterminethesiteinstallationlocationsofthesteelboxgirderblocks，thepull-outamountofthecab

6、lelengthwasusedtorapidlydeterminethetensionedcableforcesandinregardofthestructuralchar-acteristicsandtemperaturechanges，theschemeofpushingthesteelboxgirdertowardsonesidemainlyandcuttingthegirderauxiliarilyforclosureofthecentralspanwasutilizedandthepurposeofeffectivecontrolofther

7、iskoftheclosurewasachieved．Throughtheall-roundandstringentconstructioncontrol，thenorthmainbridgewaseventuallyclosedsmoothlywithhighprecisionandthegeometricshapeandin-ternalforceofthebridgecouldallsatisfythedesignrequirements．Keywords:cable-stayedbridge;steelgirder;boxgirder;unst

8、ressedstatecontrolmethod;closureofcentralspan;f