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时间:2019-05-14
《安庆长江铁路大桥主墩在深水无覆盖层条件下的围堰定位技术》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2012年第42卷第6期(总第217期)8BridgeConstruction,Vo1.42,No.6,2012(TotallyNo.217)文章编号:1003—4722(2012)06—0008—06安庆长江铁路大桥主墩在深水无覆盖层条件下的围堰定位技术郑大超,田继开(中铁大桥局施工设计事业部,湖北武汉430050)摘要:安庆长江铁路大桥主桥为主跨580m的多跨连续钢桁梁斜拉桥,该桥3号墩基础采用圆形双壁钢围堰施工,围堰定位采用无导向船重锚锚碇定位系统。针对3号墩基础深水无覆盖层地质条件下围堰施工,为实现围堰的精确定位,从钢筋混凝土梳齿锚、收锚平台及转向马口3个方面进行围
2、堰锚碇定位系统研究。围堰部分锚碇采用钢筋混凝土梳齿锚取代铁锚,钢筋混凝土梳齿锚由混凝土实体、起吊座、锚座、梳齿组成;围堰部分边锚通过新型转向马口转向至前、后定位船收锚;锚绳转向采用新型马口结构。关键词:斜拉桥;基础;围堰;锚碇;定位系统;桥梁施工中图分类号:U448.27;U445.551文献标志码:APositioningTechniquesforSteelCofferdamofMainPierofAnqingChangjiangRiverRailwayBridgeUnderConditionofDeepwaterandGeologyWithoutOverburdenZHENGD
3、a-chao,TIJANdi-kai(DivisionofConstructionDesignUndertakings,ChinaRailwayMajorBridgeEngineeringGroupCo.,Ltd.,Wuhan430050,China)Abstract:ThemainbridgeofAnqingChangjiangRiverRailwayBridgeisamulti—spancon—tinuoussteeltrussgirdercable—stayedbridgewithamainspan580mandthefoundationforthePierNO.3ofthe
4、bridgewasconstructedbythecirculardouble—wallsteelboxedcofferdamthatwaspositionedbytheheavyanchoranchoragesystemwithoututilizingtheguidingbarge.InthelightoftheconstructionofthecofferdamundertheconditionofdeepwaterandgeologywithoutO—verburdenandtOachievethepurposeofaccuratepositioningofthecoffer
5、dam,thepositioningsystemforthecofferdamwassystematicallystudiedfromthreeaspectsofthereinforcedconcrete(RC)combanchors,anchorweighingplatformandsteeringfairleaders.Accordingtothestudy,itwasdeterminedthatforpartoftheanchorsofthecofferdam,theironanchorsshouldbere—placedwiththeRCcombanchorsandacom
6、banchorofsuchtypewascomposedoftheconcretebody,liftingbase,anchorbase'andcombteeth.PartofthesideanchorsofthecofferdamweresteeredtOthefrontandrearpositioningbargesviathenewtypeofthesteeringfairleadersandwereweighed01"1thebargesthereandforsteeringoftheanchorropes,thenewtypeofthesteer—ingfairleade
7、rswereprovidedalso.Keywords:cable—stayedbridge;foundation;cofferdam;anchorage;positioningsystem;bridgeconstruction收稿日期:2O12一O8—13作者简介:郑大超,工程师,E-mail:szsmog@163.tom。研究方向:桥梁工程。安庆长江铁路大桥主墩在深水无覆盖层条件下的围堰定位技术郑大超,田继开91工程概况锚;围堰靠河侧边锚处河床无覆盖层,采用新型钢
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