坝陵河大桥钢桁加劲梁合龙关键技术

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1、桥梁建设2012年第42卷第1期(总第211期)96BridgeConstruction，Vo1．42，No．1，2012(TotallyNo．211)文章编号：1003-4722(2012)01—0096—06坝陵河大桥钢桁加劲梁合龙关键技术龚玉华，梁森，陶路。(1．贵州高速公路开发总公司，贵州贵阳550004；2．武汉市城建安全管理站，湖北武汉430015；3．中铁大桥局集团武汉桥科院有限公司，湖北武汉430034)摘要：为保证坝陵河大桥钢桁加劲梁架设的顺利进行，针对合龙过程中可能出现的竖向、横向、扭转偏差及跨中合

2、龙段合龙口长度偏小，上、下弦合龙口长度偏差不同等难点，对合龙口特征、参数敏感性、各种偏差调整措施及合龙方案进行了研究。研究结果表明，采用在两桥塔处对梁端进行牵引措施可较好解决合龙口纵向长度不配匹的难点，保证钢桁梁合龙杆件安装顺利实施；采用合龙段前端吊索暂不安装并辅以临时吊索的措施，可有效解决上、下弦合龙口偏差问题，同时也可作为钢桁梁横向、扭转偏差的调整措施。关键词：悬索桥；钢桁梁；合龙；措施；参数中图分类号：U448．25；U445．4文献标志码：AKeyTechniquesforClosureofStiffening

3、SteelTrussGirderofBalingRiverBridgeG0NGYu-hua，LJANGSen，TA0Lu。(1．GuizhouExpresswayDevelopmentCorporation，Guiyang550004；China；2．AdministrationofUrbanConstructionSafety，WuhanCity，Wuhan430015，China；3．BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineer

4、ingGroup，Wuhan430034；China)Abstract：ToensurethattheerectionofthestiffeningsteeltrussgirderofBalingRiverBridgecouldbecarriedoutsmoothly．thecharacteristicsoftheclosuregapsofthegirder，there—latedparametersensitivity，variousadjustmentmeasuresandclosureschemeswerestu

5、diedinthelightofthevertical，lateralandtorsionaldeviationsthatwouldpossiblyoccurintheprocessoftheclosureandalsotheproblemsthatthelengthoftheclosuregapatthemidspanwasslightlyshortandthelengthdeviationsoftheclosuregapsattheupperandlowerchordsweredifferent．Theresult

6、softhestudyshowthatthemeasureofhaulingthegirderendsatthetWOtowerscanwellresolvetheproblemthatthelongitudinallengthoftheclosuregapsdoesnotmatchandcanguaranteethesmoothinstallationoftheclosuremembersofthegirder．Themeasureoftempora—rilynotinstallingthepermanentsusp

7、endersinthefrontendsoftheclosuresectionsandaidingtheclosurewiththetemporarysuspenderscaneffectivelyresolvetheproblemofthedeviationsoftheclosuregapsattheupperandlowerchordsandatthesametime，canserveforadjustmentofthelateralandtorsionaldeviationsofthegirderaswel1．K

8、eywords：suspensionbridge；steeltrussgirder；closure；measure；parameter1前言于悬索桥钢桁加劲梁合龙段施工及相关控制经验较大跨度钢桁加劲梁悬索桥多见于日本，国内关少h。目前，国外常见悬索桥钢桁加劲梁的合龙收稿日期：2011—09—01作者简介：龚玉华，高级工程师，E—m