准朔铁路黄河特大桥主桥钢管拱架设方案比选

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1、桥梁建设2015年第45卷第1期(总第230期)108BridgeConstruction，Vo1．45，No．1，2O15(TotallyNo．230)文章编号：1003—4722(2015)01—0108—06准朔铁路黄河特大桥主桥钢管拱架设方案比选赵剑发(中铁六局集团有限公司，北京100036)摘要：准朔铁路黄河特大桥主桥为主跨380m的上承式钢管混凝土拱桥，主拱肋为钢管混凝土主弦杆和箱形钢腹杆组成的空间桁架结构。针对该桥结构特点和施工难点，提出了支架拼装并竖转合龙方案、单拱肋单元吊装与双拱肋单元整体吊装的“缆扣法

2、”施工方案，通过技术可行性、经济性、安全性等方面的比选，采用单拱肋和双拱肋单元整体吊装相结合的“缆扣法”施工方案。重量超过缆索吊设计吊重的节段采用单拱肋分别吊装两侧的单肢拱肋，安装K撑和横撑，在空中形成设计节段；其余节段在拼装场形成设计节段，整体运输到缆索吊下方，整体吊装后与前一节段在空中对接，然后扣索，依次形成半拱，最后完成合龙，并灌注钢管混凝土。关键词：铁路桥；拱桥；钢管拱；拱肋；缆索吊机；竖转法；缆扣法；施工方案中图分类号：U448．22；U445．46文献标志码：AComparisonofErectionSche

3、mesforSteelTubeArchofMainBridgeofHuangheRiverBridgeonZhungeer—ShuozhouRailwayZHAOJian‘fa(ChinaRailwayTieliujuEngineeringGroupCo．，Ltd．，Beijing100036，China)Abstract：ThemainbridgeoftheHuangheRiverBridgeonZhungeerShuozhouRailwayisaconerete—filledstee1tube(CFST)deckar

4、chbridgewithamainspanof380m．ThemainarchribsofthebridgearethespatialtrussstructurethatiscomposedoftheCFSTmainchordsandboxsteelwebmembers．Inthe1ightofthestructura1featuresandconstructiondifficultiesofthebridge，theschemeofassemblingthemainarchribsonscaffoldingsandcl

5、osingthearchribsbyverticallyrotatingandtheconstructionschemeoffasteningstaymethodforliftingthesinglearchribelementandintegrallyliftingthedoublearchribselementwereproposed．Throughcompari—sonofthetechnicalfeasibilityandtheconstructioncostandsafety，itwasdeterminedth

6、attheconstructionschemeoffasteningstaymethodforbothliftingthesinglearchribelementandinte—grallyliftingthedoublearchribselementshouldbeadopted．Forthearchribelementthatwasheavierthanthedesignedliftingcapacityofthecablecrane，thesinglearchribelementwasliftedonly，thes

7、ingle—legribateachsideoftheelementwasrespectivelyliftedandtheK—shapestrutsandCROSSstrutswereinstalledtoformthecompletedesignedelementintheair．Therestofthearchribelementswereassembledintothedesignedelementsintheassemblingyard，wereinte—grallytransportedtotheunderne

8、athofthecablecraneandintegrallyliftedandconnectedwiththepreviousarchribelementsintheair．Then，thefasteningstayswerefixedtograduallyformeachhalfarchandfinallytwo