大跨度钢箱梁斜拉桥施工控制

《大跨度钢箱梁斜拉桥施工控制》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、桥梁建设2013年第43卷第4期(总第221期)54BridgeConstruction，Vo1．43，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汉主桥(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工阶段

2、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，采用单侧项推为主、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。-StayedBridgeYUEQing，YAN

3、He—zhong，QUEShui—jie，LIUHua，QINZhao—fu(ChinaRailwayMajorBridgeReconnaissance＆DesignGroupCo．，Itd．，Wuhan430050，China)Abstract：Toensurethattheinternalforceandgeometricshapeofthecompletednorthmainbridge(asemi—floatingsystemsteelboxgirdercable—stayedbridgewithdoublepylons，doubleca—hiepl

4、anesandwithaminspan780m)oftheXiazhangSea-CrossingBridgecouldmeetthedesignrequirements，theconstructioncontrolofthebridgewascarriedout，usingthecontrolmethodbasedontheunstressedstatemethodtheory，theparameteridentificationandadjustmentcalcula—tionthatconsideredthestructuralnonlinearity

5、andalsotherationalcompletedbridgeandcon—structionstagestatedeterminedaccordingtothestructuralcharacteristicsofthebridge．Intheconstructioncontrol，theunstressedincludedangleswereusedtodeterminethesiteinstallationlocationsofthesteelboxgirderblocks，thepull—outamountofthecablelengthwasu

6、sedtorapid—lydeterminethetensionedcableforcesandinregardofthestructuralcharacteristicsandtempera—turechanges，theschemeofpushingthesteelboxgirdertowardsonesidemainlyandcuttingthegirderauxiliarilyforclosureofthecentralspanwasutilizedandthepurposeofeffectivecontroloftheriskoftheclosur

7、ewasachieved．Throughtheall—roundandstringentconstructioncontrol，thenorthmainbridgewaseventuallyclosedsmoothlywithhighprecisionandthegeometricshapeandinternalforceofthebridgecouldallsatisfythedesignrequirements．Keywords：cable—stayedbridge；steelgirder；boxgirder；unstressedstatecontro1

8、method；closureofcentralspa