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时间:2019-05-11
《平潭海峡公铁两用大桥栈桥设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2015年第45卷第4期(总第233期)BridgeConstruction,Vo1.45,No.4,2015(TotallyNo.233)文章编号:1003—4722(2015)04—0001—06平潭海峡公铁两用大桥栈桥设计王东辉,张立超(中铁大桥局集团有限公司,湖北武汉430053)摘要:平潭海峡公铁两用大桥全长约16.34km,桥址处风大、海况条件恶劣、地质复杂。为提高海上作业工效,减少船机设备使用,大桥基础采用长栈桥辅助施工平台施工方案,将海上施工转化为栈桥及平台施工。针对栈桥设计难点,制定了栈桥荷载组合及设计原则,并根据水深及地
2、质条件进行栈桥结构设计。栈桥全长7.49km,栈桥宽8.5m;水深≤35m,栈桥均采用钢管桩基础,35m<水深≤45m,栈桥基础采用“导管架+支承桩”结构。水深≤18m,栈桥跨径9m+15m,上部结构采用贝雷梁,钢管桩直径1.2m;水深>18m,栈桥跨径12m+32(28)m或12m+36m,上部结构采用大桥1号桁梁,钢管桩直径1.5,2,2.4in。为解决海洋环境下栈桥的耐久性问题,提出了预留钢管桩壁腐蚀裕量和管桩外表面涂装相结合的防腐设计。关键词:铁路公路两用桥;海上栈桥;荷载组合;结构设计;钢管桩;设计;桥梁施工中图分类号:U448.12;U
3、442.5文献标志码:ADesignofTrestleofPingtanStraitsRail_。cum-RoadBridgeWANGDong—hui,ZHANGLi—chao(ChinaRailwayMajorBridgeEngineeringGroupCo.,Ltd.,Wuhan430050,China)Abstract:ThePingtanStraitsRail—cum-RoadBridgeistotallyabout16.34kmlong.Thewindatthebridgesiteisstrong,theseaconditionsares
4、evereandthegeologyiscomplex.Toimprovetheefficiencyoftheconstructionovertheseaandtominimizetheusageoftheshipsandrelevante—quipment,itwasdeterminedthatthefoundationsofthebridgeshouldbeconstructedbytheschemeoftheconstructionplatformsaidedbythelongtrestlesothattheconstructionovert
5、heseacouldbeshiftedtothatonthetrestleandplatforms.Inregardofthedesigndifficultiesofthetres—tie,theloadcombinationanddesignprinciplesforthetrestlewereformulatedandthestructureofthetrestlewashencedesignedaccordingtothedifferentwaterdepthandgeologicalconditions.Thetrestleistotall
6、y7.49kmlongand8.5mwide.Intheareaofthewaterdepth≤35m,thefoundationsofthetrestlearethesteelpipepileswhileintheareaofthe35m7、thesuperstructureofthepartofthetrestleistheBaileytrussandthediametersofthesteelpipepipesare1.2m。Forthetrestleovertheareaofthewaterdepth>18m,thespanarrangementofthetrestleis12m+32(28)mor12m+36m.ThesuperstructureofthepartofthetrestleistheTrussNo.1usedforthepermanentbridgeandthed8、iametersofthesteelpipepipesare1.5,2and2.4m.Toprovidesolutiont
7、thesuperstructureofthepartofthetrestleistheBaileytrussandthediametersofthesteelpipepipesare1.2m。Forthetrestleovertheareaofthewaterdepth>18m,thespanarrangementofthetrestleis12m+32(28)mor12m+36m.ThesuperstructureofthepartofthetrestleistheTrussNo.1usedforthepermanentbridgeandthed
8、iametersofthesteelpipepipesare1.5,2and2.4m.Toprovidesolutiont
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