安庆长江铁路大桥3号墩围堰锚碇系统设计与施工

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1、安庆长江铁路大桥3号墩围堰锚碇系统设计与施工刘爱林，农代培文章编号：1003—4722(201I)06—0001—05安庆长江铁路大桥3号墩围堰锚碇系统设计与施工刘爱林，农代培(中铁大桥局宁安铁路安庆长江大桥工程指挥部，安徽安庆246008)摘要：安庆长江铁路大桥3号桥塔墩钻孔桩基础采用圆形双壁钢套箱围堰施工。为实现围堰的精确定位和施工安全，经方案比较采用无导向船的前、后定位船锚碇系统定位方案，锚型与数量、锚绳及定位船通过计算围堰下沉到位后主锚总拉力及各锚碇受力确定。设计中通过在围堰侧面的边锚拉结点及围堰顶面设置单向或多向转动的辊轴式马口解决大直径锚绳转向和收放难题；通过在前、后定位船和

2、围堰顶的收锚平台上安装卷扬机进行绞锚实现边锚收放或换锚。岸上边锚、地锚均挖坑埋设；水中锚碇采用240t抛锚船抛设完成，根据围堰下沉进展及时进行锚绳系解、收紧、过锚，完成锚碇系统施工。关键词：斜拉桥；围堰；锚碇系统；设计；桥梁施工中图分类号：U448．27；U445．55文献标志码：ADesignandConstructionofMooringSystemforCofferdamofPylonPierNo．3ofAnqingChangjiangRiverRailwayBridgeLIUAi—lin，NONGDai-pei(ConstructionHeadquartersofAnqingCh

3、angjiangRiverBridgeonNanjing—AnqingRailway，ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Anqing246008，China)Abstract：TheboredpilefoundationofpylonpierNo．3ofAnqingChangjiangRiverRailwayBridgewasconstructedwiththecirculardouble—wallsteelboxedcofferdam．Torealizetheaccu—ratepositioningandconstructi

4、onsafetyofthecofferdam，throughcomparisonofthedifferentschemes，itwasdecidedthatthecofferdamwouldbepositionedbythemooringsystemfromthefrontandrearpositioningbargeswithoututilizingguidingbarge．Thetypesandnumbersofthemooringanchors，themooringropesandpositioningbargesweredeterminedaccordingtothecal—cu

5、lationofthetotaltensileforceofthemainanchorsandtheforceofeachanchoraftersinkingthecofferdaminplace．Inthedesign，theproblemofsteeringandreelingofthelargediametermoor—ingropeswastackledbythetiepointsonthesidesofthecofferdamandbytheone—wayormulti-wayrollingfairleaderssetatthetopofthecofferdam．Theside

6、anchorswereheavedbythewin-chesinstalledontheanchorweighingplatformsonthefrontandrearpositioningbargesandatthetopofthecofferdamandtheanchorscouldbethereforecast，weighedandchanged．Thesidean—chorsontheshoreandgroundanchorswereembeddedintheexcavatedpitsandtheanchorsunderwaterwerecastbythe240tbarge．Th

7、emooringropesweretimelytied，untied，tightenedandtheanchorswereadjustedinpaceofsinkingofthecofferdamtofinallycompletetheconstructionofthemooringsystem．Keywords：cable—stayedbridge；cofferdam；mooringsystem；design；bridgecons