厦漳跨海大桥北汊主桥配切顶推合龙技术

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1、桥梁建设2013年第43卷第4期(总第221期)BridgeConstruction，Vo1．43，No．4，2013(TotallyNo．221)49文章编号：1003—4722(2013)04—0049—05厦漳跨海大桥北汊主桥配切一顶推合龙技术易云炕，严和仲。，赵鸡鹏，岳青。(1．厦门理工学院土木工程与建筑学院，福建厦门361021；2．福建厦漳大桥有限公司，福建漳州363105；3．中铁大桥(南京)桥隧诊治有限公司，江苏南京210061；4．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双塔双索面钢箱梁斜拉桥，主梁采用悬臂拼装施工，中跨合龙

2、方案采用配切一顶推合龙技术：在合龙前对合龙口进行观测，并拟合出合龙口宽度～温度曲线，根据预测的合龙1：2宽度对合龙段下料，同时在塔梁临时锚固上对单侧主梁顶推和回移一较小位移。实践证明，该桥采用的配切一顶推合龙技术既能确保合龙段顺利吊入合龙口，又能达到理想的焊缝宽度，提高了合龙的可靠性，降低了结构安全风险。关键词：斜拉桥；箱形梁；钢梁；配切一顶推合龙技术；施工步骤；关键技术；桥梁施工中图分类号：U448．27；U445．4文献标志码：ATechniqueofCutting—PushingClosureforNorthMainBridgeofXiazhangSea—CrossingBri

3、dge111Yun—kun～，YANHe-zhong。，ZHAOKun—peng，YUEQing。(1．SchoolofCivilEngineeringandArchitecture，XiamenUniversityofTechnology，Xiamen361021，China；2．FujianXiazhangBridgeCo．，Ltd．，Zhangzhou363105，China；3．ChinaRailwayMajorBridge(Nanjing)BridgeandTunnelDiagnosisandRemedialCo．，Ltd．，Nanjing210061，China；4．Th

4、e5thEngineeringCo．，Ltd．，ChinaRailwayMajorBridgeEngineeringGroup，Jiujiang332001，China)Abstract：ThenorthmainbridgeoftheXiazhangSea—CrossingBridgeisasteelboxgirderca—ble—stayedbridgewithdoublepylonsanddoublecableplanes．Themaingirderofthebridgewaserectedbythecantileverassemblingmethodandthecentrals

5、panwasclosedbythetechniqueofcuttingandpushing．Beforethespanwasclosed，theclosuregapwascontinuouslyobservedandtheclosuregapwidth~temperaturecurveswerefitted．Inthelightofthepredictedwidthoftheclosuregap，thematerialfortheclosureblockwaslaidoffandalsoatthetemporaryfixityofapylonandthegirder，thegirde

6、rwaspushedtowardsonesideand／orwithdrawnalittleamount．Practiceprovesthatthetechniqueofthecuttingandpushingclosureappliedtothebridgenoton—lyensurestheclosureblocktobesmoothlyliftedintotheclosuregapandbutalsoachievesthei—．dealwidthoftheweldingseams．Withthetechnique，thereliabilityoftheclosureisimpr

7、ovedandthestructuralsafetyriskisdecreased．Keywords：cable—stayedbridge；boxgirder；steelgirder；techniqueofcuttingandpushingclosure；constructionsequence；keytechnique；bridgeconstruction1工程概况95m，采用半飘浮体系，厦漳跨海大桥北汉主桥桥厦漳跨海大桥北汉主桥为双塔双索面钢箱梁斜跨布