大型钢吊箱拉靠墩系统精确定位施工技术

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1、大型钢吊箱拉靠墩系统精确定位施工技术陈超华，徐斯林，穆清君71文章编号：1003—4722(2011)06—0071—05大型钢吊箱拉靠墩系统精确定位施工技术陈超华，徐斯林，穆清君(中交二航局第五工程分公司，湖北武汉430012)摘要：武汉二七长江大桥主桥为三塔结合梁斜拉桥，其3号墩位于深水中，采用钢吊箱实现承台干施工。为解决大型钢吊箱精确定位难题，经过方案比选，采用拉靠墩系统定位方案，该系统由上游拉墩和下游靠墩组成，拉墩设主拉缆和下拉缆，靠墩设交叉拉缆，顺桥向抛锚，设置边锚缆。施工准备后，利用拉靠墩系统

2、进行钢吊箱初定位，使其平面位置基本就位；通过边锚缆系统、拉缆系统及夹壁舱不均衡灌水调整钢吊箱的平面位置、平面扭转及摆动、垂直度，使其平面偏位在±12mm内、扭角为58、倾斜度为1／3000，满足规范要求，实现了钢吊箱精确定位。关键词：斜拉桥；钢吊箱；拉靠墩系统；定位；施工技术；桥梁施工中图分类号：U445．556；U448．27文献标志码：AConstructionTechniqueforAccuratePositioningofLargeSteelBoxedCofferdamUsingPullingan

3、dBerthingPierSystem．CHENChao-hua，xUSi-lin，MUQing-jun(The5thEngineeringCompany，CCCCSecondHarborEngineeringCo．，Ltd．，Wuhan430012，China)Abstract：ThemainbridgeofWuhanErqiChangjiangRiverBridgeisathree—pyloncompositegirdercable—stayedbridge．Thepilecapofpylonpier

4、No．3ofthebridgeislocatedindeepwaterandwasconstructedindryenvironmentinlargesteelboxedcofferdam．Toresolvetheproblemofaccuratepositioningofthelargecofferdam，thepullingandberthingpiersystemwasusedaftercomparisonofthedifferentpositioningschemes．Thepiersystemi

5、scomposedofapullingpierattheupstreamsideandaberthingpieratthedownstreamside，onthepullingpier，themainpul—lingcablesandtie—downcablesweresetwhileonthgberthingpier，thecrisscrosspullingcableswereset．Thepositioninganchorswerecastintotheriverlongitudinallyalong

6、thebridgeandthesideanchoringcableswereset．Afterconstructionpreparation，thecofferdamwasinitiallyposi—tionedbythepullingandberthingpiersystemtomakethecofferdambasicallysetinplaceinplanposition．Byusingthesideanchoringcables，pullingcablesandbymeansofnon—unifo

7、rmpum—pingofwaterintothebulksofthecofferdam，theplanposition，plantorsion，oscillationandper—pendicularityofthecofferdamwereadjustedandtheplanoffsettingofthecofferdamwasbroughttobewithin±12mm，thetorsionalangletobe58”andtheinclinationtobe1／3000SOastomaketheco

8、nstructionofthecofferdammeettherelevantrequirementsinthecodesandeventuallyrealizetheaccuratepositioningofthecofferdam．Keywords：cable—stayedbridge；steelboxedcofferdam；pullingandberthingpiersystem；positioning；construc