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1、鄭州黃河公鐵兩用橋施工控制關(guān)鍵技術(shù)研究孫英杰，肖海珠，徐偉文章編號：1003—4722(20l1)020005—04鄭州黃河公鐵兩用橋施工控制關(guān)鍵技術(shù)研究孫英杰，肖海珠，徐偉(中鐵大橋勘測設(shè)計(jì)院有限公司，湖北武漢430056)摘要：鄭州黃河公鐵兩用橋是斜邊桁無豎桿的三主桁、單索面多塔斜拉橋，為了使該橋建成后達(dá)到設(shè)計(jì)目標(biāo)受力狀態(tài)，對其施工全過程進(jìn)行控制，鋼梁頂推過程中以最大懸臂狀態(tài)關(guān)鍵桿件內(nèi)力控制為主、線形控制為輔；頂推到位后以預(yù)制橋面板抄墊高程和索力控制為重點(diǎn)。建立板梁索相結(jié)合的空間模型模擬施工過程，根據(jù)計(jì)算結(jié)果
2、確定施工I臨時平聯(lián)布設(shè)方案，并實(shí)現(xiàn)頂推過程平面中線控制、頂推完成后墩頂3桁高差調(diào)整、橋面板高差控制、斜拉索張拉控制，確保各施工階段的桿件內(nèi)力、斜拉索索力和主梁線形3項(xiàng)指標(biāo)均達(dá)到設(shè)計(jì)要求。關(guān)鍵詞：公路鐵路兩用橋；斜拉橋；結(jié)合梁；桁架；頂推法架橋；施工控制中圖分類號：U448．121；U448．27；U445．1文獻(xiàn)標(biāo)志碼：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
