厦漳跨海大桥南汊主桥定时合龙技术

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1、桥梁建设2013年第43卷第2期(总第219期)BridgeConstruction，Vo1．43，No．2，2013(TotallyNo．219)1O5文章编号：1O03—4722(2013)O2—0105—05厦漳跨海大桥南汊主桥定时合龙技术易云炕，谢泽福。，牛海喜(1．福建厦漳大桥有限公司，福建漳州363105；2．中交一公局厦门工程有限公司，福建厦门361021)摘要：厦漳跨海大桥南汉主桥为双塔平行索面钢一混凝土结合梁斜拉桥。该桥原定中跨合龙采用配切合龙方案，但由于配切合龙对气温的预测要求较高、合龙开

2、始时问不确定，最终确定该桥中跨合龙采用定时合龙技术。定时合龙技术在合龙口旁第2个梁段安装完后，对扩大的合龙口进行连续观测，对合龙段提前下料，在标准段安装完后，立即开始吊装合龙段。该技术以长圆孔工具板、临时连接件为辅助工具，先固定合龙口状态，再确定永久拼接板的尺寸，最后由永久拼接板替换工具板，完成合龙。该桥采用定时合龙技术顺利合龙，实践表明，该技术放宽了对体系变形预测准确性的要求，提高了合龙的可靠性、降低了结构的安全风险。关键词：斜拉桥；组合梁桥；合龙；定时合龙技术；施工步骤；关键技术中图分类号：U448．27

3、；U445．4文献标志码：ATechniqueofFixedTimeClosureforMainBridgeofSouthBridgeofXiazhangSea-CrossingBridgeYIYun-kun，XIEZe-fu，NIUHai—xi。(1．FujianXiazhangBridgeCo．，Ltd．，Zhangzhou363105，China；2．XiamenEngineeringCo．，Ltd．，CCCCFirstHighwayEngineeringCo．，Ltd．，Xiamen361021，Ch

4、ina)Abstract：ThemainbridgeofthesouthbridgeoftheXiazhangSea-CrossingBridgeisasteelandconcretecompositegirdercable—stayedbridgewithdoublepylonsandparallelcableplanes．Originallyitwasdecidedthattheclosureofthecentralspanofthemainbridgewastobecarriedout，usingthe

5、cuttingclosurescheme，butbecausethetemperaturepredictionoftheschemewasdemandingandthestartingtimefortheclosurewasuncertain，thecuttingclosureschemewasthereforechangedintothetechniqueofthefixedtimeclosure．Thetechniquewasthatafterthesecondgirdersegmentofthemain

6、bridgewasinstallednearbytheclosuregap，theexpandedclo—suregapwasconsecutivelyobserved，thematerialfortheclosuresegmentwaslaidoffinadvanceandimmediatelyafterthelasttypicalsegmentwasinstalled．theclosuresegmentwasliftedinplaceandinstalled．Inthetechnique，theslott

7、edholetoolplatesandthetemporaryconnectorswereusedaStheauxiliarytools，theclosuregapwasfirstlyfixedbytheplatesandconnectors，thedimensionsofthepermanentspliceplateswerethenconfirmedandfinallythetoolplateswouldbereplacedwiththepermanentspliceplatesandtheclosure

8、ofthecentralspanwastom—pleted．Withthetechniqueofthefixedtimeclosure，theclosureofthecentralspanofthebridgeproceededsmoothly．Practiceprovedthatthetechniquerelaxedtheaccuracyrequirementforthesystemdeforma