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时间:2019-05-14
《大跨长联钢桁梁顶推关键技术》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、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
2、重量27000t,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(Chi
3、naRailwayMajorBridgeEngineering,Inc.,Wuhan430050.China)Abstract:ThemainbridgeofZhengzhouHuangheRiverRail—cum—RoadBridgeisarrangedintwocontinuousunits,ofwhichthefirstunitisasix—pyloncontinuouscompositesteeltrussgirdercable—stayedbridgewithspanarrangement(12O
4、+5×168+120)mandthesecondunitisacon—tinuouscompositesteeltrussgirderbridgewithspanarrangement(5×120)m.Thefirstunittrussgirderofthebridgewaserectedbytheconstructiontechniqueofmulti—point,continuousandsynchronousincrementallaunchingandtheMIDASCivilsoftwarewasu
5、sedtOconductthecalculationofthelaunchingconstruction.tnviewofthereactionforceandfrictiona1forceatthetopsofthepiers,2setsof350一tcapacitycontinuousjackswereprovidedateachpier.Theincre—mentallaunchingdistanceofthelongspanandlongcontinuousunittrussgirderofthebr
6、idgewas1080mandthetotallaunchingweightwas27000t.ThesidetrusseswerelaunchedDositivelvwhilethemiddletrusswasmovedpassivelyandthetechniqueofthemulti—point,continuousanddynamiccontrolofcomputerwasapplied.Thelaunchingnosestructureandthemainsteeltrussgirderweretr
7、ansformedformtheinclinedtrussesintothestraightonesviatheconnectionDointsofthestructureandthegirder.Theslipwaywasarrangedbythesideofthepiersandthesystemoftheslipblockswastransformedbythejacksinstalledatthefrontendoftheslipwaytofina11vsatisfytheforcecondition
8、requirementsofthetrussgirderstructure.Keywords:ZhengzhouHuangheRiverRail—cum—RoadBridge;longspanbridge;steeltrussgirder;incrementa1launchingerection:bridgeconstruction收稿日期:2010—09—08作者简介:姚发海(1972-),男,高
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