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1、大型鋼吊箱拉靠墩系統(tǒng)精確定位施工技術陳超華，徐斯林，穆清君71文章編號：1003—4722(2011)06—0071—05大型鋼吊箱拉靠墩系統(tǒng)精確定位施工技術陳超華，徐斯林，穆清君(中交二航局第五工程分公司，湖北武漢430012)摘要：武漢二七長江大橋主橋為三塔結合梁斜拉橋，其3號墩位于深水中，采用鋼吊箱實現(xiàn)承臺干施工。為解決大型鋼吊箱精確定位難題，經(jīng)過方案比選，采用拉靠墩系統(tǒng)定位方案，該系統(tǒng)由上游拉墩和下游靠墩組成，拉墩設主拉纜和下拉纜，靠墩設交叉拉纜，順橋向拋錨，設置邊錨纜。施工準備后，利用拉靠墩系統(tǒng)
2、進行鋼吊箱初定位，使其平面位置基本就位；通過邊錨纜系統(tǒng)、拉纜系統(tǒng)及夾壁艙不均衡灌水調整鋼吊箱的平面位置、平面扭轉及擺動、垂直度，使其平面偏位在±12mm內、扭角為58、傾斜度為1／3000，滿足規(guī)范要求，實現(xiàn)了鋼吊箱精確定位。關鍵詞：斜拉橋；鋼吊箱；拉靠墩系統(tǒng)；定位；施工技術；橋梁施工中圖分類號：U445．556；U448．27文獻標志碼：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
