郑州黄河公铁两用桥施工控制关键技术研究

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1、郑州黄河公铁两用桥施工控制关键技术研究孙英杰，肖海珠，徐伟文章编号：1003—4722(20l1)020005—04郑州黄河公铁两用桥施工控制关键技术研究孙英杰，肖海珠，徐伟(中铁大桥勘测设计院有限公司，湖北武汉430056)摘要：郑州黄河公铁两用桥是斜边桁无竖杆的三主桁、单索面多塔斜拉桥，为了使该桥建成后达到设计目标受力状态，对其施工全过程进行控制，钢梁顶推过程中以最大悬臂状态关键杆件内力控制为主、线形控制为辅；顶推到位后以预制桥面板抄垫高程和索力控制为重点。建立板梁索相结合的空间模型模拟施工过程，根据计算结果

2、确定施工I临时平联布设方案，并实现顶推过程平面中线控制、顶推完成后墩顶3桁高差调整、桥面板高差控制、斜拉索张拉控制，确保各施工阶段的杆件内力、斜拉索索力和主梁线形3项指标均达到设计要求。关键词：公路铁路两用桥；斜拉桥；结合梁；桁架；顶推法架桥；施工控制中图分类号：U448．121；U448．27；U445．1文献标志码：AResearchofKeyTechniquesforConstructionControlofZhengzhouHuangheRiverRail·‘cure‘·RoadBridgeSUNling

3、—jie，XIAOHai—zhu，XUWei(ChinaRailwayMajorBridgeReconnaissance&DesignInstituteCo．，Ltd．，Wuhan430056，China)Abstract：ZhengzhouHuangheRiverRail—cum—RoadBridgeisasingle—cable-planeandmulti—pyloncable—stayedbridgehavingthreemaintrusseswithoutverticalmembersandwithtwo

4、in——clinedsidetrusses．Toensurethatthecompletedbridgeofthebridgecouldmeetthedesigntargetforceconditions，thewholeconstructionprocessofthebridgewascontrolled．Intheprocessofincrementallaunchingofthesteeltrussgirder，theinternalforceinthecriticalmembersofthegirderi

5、nthestateofthemaximumcantileverwascontrolledmainlywhilethegeometricshapeofthegirderwascontrolledsubsidiarily．Oncethegirderwaslaunchedinplace，theprecastdeckslablevelingelevationandthecableforcesofstaycableswerethemajorpointsthatwouldbepar—ticularlycontrolled．T

6、hespatialmodelsoftheslab—girder—cableweresetuptOsimulatethecon—structionprocessandinaccordancewiththecalculation，thearrangementoftemporaryconstruc—tionlateralbracingswasdetermined，thecontrolofcenterlineinplaneintheprocessofthelaunching，theadjustmentofheightdi

7、fferenceofthethreemaintrussesatoppiersafterthelaunching，thecontrolofheightdifferenceofthedeckslabsandthecontroloftensioningofthestaycableswererealizedandconsequentlythethreeindicesoftheinternalforceinthemembers，thecableforcesofthestaycablesandthegeometricshap

8、eofthegirderinvariousconstructionstageswereallensured．Keywords：rail—cum—roadbridge；cable—stayedbridge；compositegirder；truss；incrementallaunchingerection：constructioncontrol收稿日期：2010—11—10