大跨长联钢桁梁顶推关键技术.pdf

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1、大跨长联钢秆亍梁顶推关键技术姚发海文章编号：1003—4722(2011)02～0001—04大跨长联钢桁梁顶推关键技术蝴发海(中铁大桥局股份有限公司，湖北武汉430050)摘要：郑州黄河公铁两用桥主桥分2联布置，第1联为(12O+5×168+120)m的六塔连续钢桁结合梁斜拉桥，第2联为5×120m的连续钢桁结合梁桥，钢桁梁架设采用多点连续同步顶推施工技术。采用MIDASCivil软件进行钢桁梁顶推施工计算，根据墩顶反力和摩擦力，每墩配2台350t的连续千斤顶。该桥大跨长联钢桁梁顶推距离为1080m，顶推总重量27000

2、t，边桁主动顶推，q-桁被动移动，采用计算机多点连续动态控制技术。导梁结构与主体钢桁梁通过连接节点由斜桁变直桁。在墩旁设滑道，通过滑道前端千斤顶进行滑块体系转换，实现桁架结构受力要求。关键词：郑州黄河公铁两用桥；大跨度桥；钢桁梁；顶椎法架桥；桥梁施工中图分类号：U448．121；U445．462文献标志码：AKeyTechniquesforIncrementalLaunchingofLongSpanandLongContinuousUnitSteelTrussGirderAOFa—hai(ChinaRailwayMajor

3、BridgeEngineering，Inc．，Wuhan430050．China)Abstract：ThemainbridgeofZhengzhouHuangheRiverRail—cum—RoadBridgeisarrangedintwocontinuousunits，ofwhichthefirstunitisasix—pyloncontinuouscompositesteeltrussgirdercable—stayedbridgewithspanarrangement(12O+5×168+120)mandthesec

4、ondunitisacon—tinuouscompositesteeltrussgirderbridgewithspanarrangement(5×120)m．Thefirstunittrussgirderofthebridgewaserectedbytheconstructiontechniqueofmulti—point，continuousandsynchronousincrementallaunchingandtheMIDASCivilsoftwarewasusedtOconductthecalculationof

5、thelaunchingconstruction．tnviewofthereactionforceandfrictiona1forceatthetopsofthepiers，2setsof350一tcapacitycontinuousjackswereprovidedateachpier．Theincre—mentallaunchingdistanceofthelongspanandlongcontinuousunittrussgirderofthebridgewas1080mandthetotallaunchingwei

6、ghtwas27000t．ThesidetrusseswerelaunchedDositivelvwhilethemiddletrusswasmovedpassivelyandthetechniqueofthemulti—point，continuousanddynamiccontrolofcomputerwasapplied．Thelaunchingnosestructureandthemainsteeltrussgirderweretransformedformtheinclinedtrussesintothestra

7、ightonesviatheconnectionDointsofthestructureandthegirder．Theslipwaywasarrangedbythesideofthepiersandthesystemoftheslipblockswastransformedbythejacksinstalledatthefrontendoftheslipwaytofina11vsatisfytheforceconditionrequirementsofthetrussgirderstructure．Keywords：Zh

8、engzhouHuangheRiverRail—cum—RoadBridge；longspanbridge；steeltrussgirder；incrementa1launchingerection：bridgeconstruction收稿日期：2010—09—08作者简介：姚发海(1972-)，男，高