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1、跨高速公路异形钢箱梁步履式顶推施工技术刘金明十局集团第四工程有限公司摘要：甘肃省天水市罗家沟大桥跨天北高速公路变宽截面钢箱梁重818t,采用多点、三向、智能同步顶推的施工工艺和顶升位移、顶升力的高精度双控完成50m锚跨的就位。将钢主梁在临时支架上拼装完成后架设钢导梁，钢导梁前段支撑在前方24m处的临时支墩上，后端与钢箱主梁焊接。首次顶推主梁前进25m，前端支撑在临吋支墩上，钢导梁前端支撑在8#墩上;再次顶推钢箱主梁前推25m,钢箱主梁前端支撑在8#墩上，拆除前导梁，钢箱主梁顶推完成。介绍丫步履式顶推的操作过程、设备体系和关键技术。在不中断高速公路交通的情况下安全、高效的完成了斜交
2、异形钢箱梁的顶推施工。经检测该桥各项指标均符合设计和规范要求,经济效益和社会效益显著。关键词：跨高速公路;异形钢箱梁;步履式顶推;作者简介：刘金明（1977一），男，工程师，主要从事建筑施工技术和科技管理工作。jtb204@163.com收稿日期：2017-10-09OntheWalkingPushConstructionTechniquesforShapeSteelBoxGirdersOverpassinganExpresswayLIUJinmingThe4thEngineeringCo.Ltd,ofthe20thBureauGroupofChinaRailway:Abstra
3、ct：TheLuojiagouBridgeinTianshuiCityofGansuProvinceoverpassestheTian-BeiExpressway,thevariable-widthcross-sectionsteelboxgirderofwhichis818tinweight.Theboxgirderisjackedinplacebymeansofthemulti-point,3-direction,intelligentsynchronousjackingconstructionprocess,andtheprecisedualcontrolofboththe
4、liftingdisplacementandtheliftingforcetohelpmovethe50manchoredspaninplace.Afterthemainsteelgirderisassembledonthetemporarybrackets,erectedisthesteelnosegirder,thefrontendofwhichrestsonthetemporarysupportingpier24mahead,andthehindendofwhichisweldedontothemainsteelgirder.Duringthe1st-timejacking
5、operation,themaingirdermoves25metersforward,thefrontendofwhichrestsonthetemporarysupportingpier,andthefrontendofthesteelnosegirderrestsonthe8thpier.Then,themaingirderisjackedtomoveanother25metersforward,withthefrontendofitrestingonthe8thpier.Whenthefrontnosegirderisremoved,thejackingofthemain
6、steelboxgirderiscompleted.Introducedhereinthepaperaretheprocessofthewalkingpushoperation,theequipmentsystemandthekeytechniquesconcerned.Becauseofthewalkingpushtechniqueadoptedfortheproject,thejackingoperationoftheobliquecrossingshapesteelboxgirderissafelyandefficientlycompletedwithoutinterrup
7、tingthenormaltrafficoftheexistingexpressway.Andallthetargetsofthebridgearefoundtobeinfullagreementwiththerequirementsofthedesignandthetechnicalspecifications,withboththeremarkableeconomicandsocialeffectsachieved.Keyword：overpassanexpressway;s
