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时间:2018-07-08
《港珠澳大桥超高强度平行钢丝斜拉索设计与技术研究》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2014年第44卷第5期(总第228期)88BridgeConstruction,Vol.44,No.5,2014(TotallyNo.228)文章编号:1003-4722(2014)05-0088-06港珠澳大桥超高强度平行钢丝斜拉索设计与技术研究刘明虎1,薛花娟2(1.中交公路规划设计院有限公司,北京100088;2.江苏法尔胜缆索有限公司,江苏江阴214433)摘要:港珠澳大桥青州航道桥和江海直达船航道桥均采用斜拉桥,斜拉索均采用平行钢丝索。为减小索体阻风面积、减轻重量,在国内首次设计采用1860MPa钢丝斜拉索。为确保
2、斜拉索技术性能并提高其耐久性,对钢丝关键技术参数进行了研究,对锚具材料及构造尺寸进行了理论计算和设计,并试制成品索开展了物理模型试验。结果表明,钢丝抗拉强度不低于1860MPa;扭转次数不小于12次;在规定条件下疲劳应力幅达410MPa以上;表面采用锌-5%铝合金镀层防腐性能优;试制成品索的锚固、疲劳及水密性性能均满足规范及设计要求,可应用于港珠澳大桥。关键词:斜拉桥;平行钢丝斜拉索;锚具;扭转;锚固;疲劳;水密性;试验中图分类号:U443.38文献标志码:ADesignandTechnologicalStudyofSuperHigh
3、StrengthParallelSteelWireStayCablesforHongKong-Zhuhai-MacaoBridgeLIUMing-hu1,XUEHua-juan2(1.CCCCHighwayConsultantsCo.,Ltd.,Beijing100088,China;2.JiangsuFastenSteelCableCo.,Ltd.,Jiangyin214433,China)Abstract:TheQingzhouShipChannelBridgeandtheRiver-to-SeaShipChannelBridge
4、oftheHongKong-Zhuhai-MacaoBridgearethecable-stayedbridgesandthestaycablesofthetwobridgearetheparallelsteelwirecables.Tominimizethewindresistantareasandtoreducetheweightofthecables,the1860MPasteelwirestaycablesweredesignedandwereusedforthebridgesforthefirsttimeinChina.To
5、ensurethetechnologicalpropertiesofthecablesandim-provethedurability,thecriticaltechnologicalparametersofthesteelwireswerestudied,thema-terialsandstructuraldimensionsoftheanchordevicesofthecablesweretheoreticallycalculatedanddesigned,thetrialfinishedcablesweremanufacture
6、dandthephysicalmodeltestsfortheca-bleswerecarriedout.Theresultsshowthatthetensilestrengthofeachwireofthecablesisnotlessthan1860MPaandthetwistingnumbersarenotlessthan12times.Underthespecifiedconditions,thefatiguestressamplitudeofthewireisupto410MPaandthepropertyofthesur-
7、facecorrosionprotectionofthezincand5%aluminumalloycoatingissuperior.Theanchoringofthetrialcables,thefatigueandwatertightnesspropertiesofthecablescanmeettherelevantre-quirementsinthecodesanddesignandthecablescanbeputinuseonthebridges.Keywords:cable-stayedbridge;parallels
8、teelwirestaycable;anchordevice;twisting;an-choring;fatigue;watertightness;test1工程概况港珠澳大桥跨越珠江口伶仃洋海域,是连接香港、珠海、澳门
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