天津团泊新桥施工控制

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1、桥梁建设2013年第43卷第1期(总第218期)BridgeConstruction，Vo1．43，No．1，2013(TotallyNo．218)99文章编号：1003—4722(2013)01—0099—05天津团泊新桥施工控制闫燕红，孙运国，何立忠(天津市市政工程研究院，天津300074)摘要：为了使团泊新桥(独柱斜塔空间扭面背索混合梁斜拉桥)的成桥线形和索力、应力均达到设计及规范要求，根据该桥结构特点及主要施工过程，确定该桥施工控制以桥塔线形控制为主，索力的确定采用基于正装法及最小二乘法原理的优化方法，该桥斜拉索控制张拉索力的确定分桥塔悬臂施工和体系转换施工2

2、个阶段进行。通过参数识别确定将背索和前索索力作为重点识别的结构参数。桥塔目标线形控制主要通过对塔柱拼装线形控制与索力调整控制来实现。塔柱施工过程中需采用合理的索力张拉顺序保证桥塔施工中及成桥状态的内力安全，桥塔线形控制包括塔柱拼装线形与塔柱整体姿态2部分。团泊新桥成桥后各控制参数满足设计要求。关键词：斜拉桥；桥塔；斜拉索；索力；参数识别；线形；施工控制中图分类号：U448．27文献标志码：AConstructionControlofNewTuanboBridgeinTianjinYANYan—hong，SUNYun—guo，HELi—zhong(TianjinMuni

3、cipalEngineeringResearchInstitute，Tianjin300074，China)Abstract：Toensurethatthegeometricshapes，cableforcesandstressofthecompletedbridgeoftheNewTuanboBridge(ahybridgirdercable—stayedbridgewithasingleinclinedcol—umnpylonandspatialtwistedbackstays)inTianjincouldmeettherelevantrequirementsin

4、thedesignandcodesandinthelightofthestructuralcharacteristicsandthemajorconstructionprocessofthebridge，itwasdeterminedthatthegeometricshapesofthepylonofthebridgeweretobemainlycontrolledintheconstruction．Thecableforcesofthestaycablesweretobedeter—mined，usingtheoptimizationmethodbasedonthe

5、forwardassemblingcalculationmethodandtheprinciplesoftheleastsquaremethod．ThetensionedcableforcesweretobecontrolledintwOstagesofthecantileverconstructionandsystemtransformationofthepylon．Thecableforcesofthebackstaysandfrontstaysweretoberegardedasthecriticalstructuralparameterstobepar—tic

6、ularlyidentifiedintheparameteridentification．Thecontrolofthetargetgeometricshapesofthepylonwastoberealizedthroughthecontroloftheassemblinggeometricshapesofthepyloncolumnandthecableforceadjustment．Intheconstructionprocessofthepylon，therationalten—sioningsequencesofthestaycableswerenecess

7、arilytobeadoptedSOastoensurethesafetyoftheinternalforcesofthepyloninboththeconstructionandcompletedbridgestate．Theeontrolofthegeometricshapesofthepylonincludedtwopartsoftheassemblinggeometricshapesandtheglobalpostureofthepyloncolumn．Aftertheconstructionofthebridgewasfinallycomp