厦漳跨海大桥北汊斜拉桥墩顶区钢箱梁架设方案

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1、桥梁建设2012年第42卷第5期(总第215期)BridgeConstruction，Vo1．42，No．5，2012(TotallyNo．215)1O9文章编号：1003～4722(2012)05—0109—05厦漳跨海大桥北汊斜拉桥墩顶区钢箱梁架设方案赵鸡鹏，潘胜平(中铁大桥局集团第五工程有限公司，江西九江332001)摘要：厦漳跨海大桥北汉主桥为多跨连续半飘浮体系双塔双索面斜拉桥，主梁为扁平流线型封闭钢箱梁，全桥钢箱梁共划分为99节，其中墩顶区9节。经方案分析比选，选择活动支架辅助不变幅吊机

2、架设该桥墩顶区钢箱梁。为达到支架活动变位操作简单、变形过程顺利，变形及承重状态安全，在桥塔墩项区设置三角形活动支架，利用液压控制系统，通过上、下滑块实现支架变位；在其他墩顶区设置活动跳板梁，通过卷扬机和2套滑车纽实现支架变位。为方便桥塔区架梁吊机转移，设置了1个长17m、高3．4m的架梁吊机底座。墩项区梁段架设时，依次起吊梁段并顶推滑移到位，辅助墩及过渡墩顶梁段采用悬臂拼装方式安装。关键词：斜拉桥；钢梁；箱形梁；活动支架；桥梁架设；施X-方案中图分类号：U448．27；U445．4文献标志码：AE

3、rectionSchemeforSteelBoxGirderinPierTopAreasofCable—StayedBridgeofNorthBridgeofXiazhangSea—CrossingBridgeZHAOKun—peng，PANSheng-ping(The5thEngineeringCo．，Ltd．，ChinaRailwayMajorBridgeEngineeringGroup，Jiujiang332001．China)Abstract：Themainbridgeofthenorth

4、bridgeofXiazhangSea—CrossingBridgeisamulti—spansemi——floatingsystemcontinuouscable——stayedbridgewithdoublepylonsanddoublecableplanes．Themaingirderofthebridgeemploysthestreamlinedflatclosedsteelboxgirderthathastotally99segments，ofwhich9segmentsarearran

5、gedinthepiertopareas．Afteranalysisandcomparisonofthedifferenterectionschemes，itwasdeterminedthattheschemeoferectingthesteelboxgirderinthepiertopareas，usingthenon—luffingcranesaidedbythemovablescaffold—ingsshouldbeapplied．Toachievethesimpleoperationofp

6、ositionchangingofthescaffoldingsandtoensurethatthedeformationprocessofthescaffoldingswassmooth，thedeformationandload—bearingconditionsofthescaffoldingsweresafe，themovabletrianglescaffoldingswerear～rangedinthepylonpiertopareasandthepositioningchangingo

7、fthescaffoldingswastobereal—ized，usingthehydrauliccontrolsystemandtheupperandlowerslidingblocks．Intheotherpiertopareas，themovablegangwaybeamswerearrangedandthepositionchangingofthescaffold—ingstherewastoberealized，usingthewinchesandtwosetsofpulleybloc

8、ks．Tofacilitatetheshiftingofthecraneintheareaofapylon，acranebasethatwas17mlongand3．4mhighwasinstalled．Fortheerectionofthegirderinthepylonpiertopareas，thesegmentsofthegirderweresuccessively1ifted．pushedandslidinplacewhilefortheerectionofthegird