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摘要本桥为跨狮狸沟而设，本桥上部结构为二联2-40m+一联3-50mT梁，T梁采用先简支后连续结构。本桥位于直线上，纵向位于+0.8%上坡段，设计荷载为一级，桥面宽度为净9附2×2.0m人行道，设计洪水频率为1/100，基本地震烈度为Ⅶ级。墩台方向均按路线方向布置。桥面采用15cm混凝土铺装，FYT-1防水层，9cm沥青混凝土。上部结构进行了截面尺寸的拟定，梁桥自重和二期恒载的横载内力计算，活载内力计算，最不利荷载组合等，为下部结构的检算奠定基础。下部结构采用钢筋混凝土柱式墩，板式空心墩。基础采用挖孔灌注桩和钻孔灌柱桩。本设计采用容许应力法对此桥下部结构进行设计并检算。对基础，承台按刚性承台板进行设计计算，对桩分别按土的阻力和桩身材料强度计算单桩轴向容许承载力，检算外荷载作用下桩身稳定性和材料强度，检算桩的抗裂性。并对桥墩进行基础沉降和墩顶水平位移检算。最终的计算结果表明，上述所有各项检算均符合各相关规定要求。关键词：桥梁下部结构桥墩桩AbstractThisbridgesupposesforthecrosslionfoxditch,Thebridgestructureforthecombined2-40m+ajoint3-50mbeam，T-beamusedinsimpleandcontinuoussupportstructure.Thebridgeislocatedinstraightline,vertical+0.8%attheuphill,Designofaload,thebridgedeckwidthofthenetwithtwo9×2.0msidewalks,designfloodfrequencyof1/100,forthebasicseismicintensityⅦlevel.Apillardirectionpressestheroutedirectionarrangement.Thebridgefloorusesthe15cmconcretepaving,theFYT-1waterprooflayer,the9cmasphaltconcrete.Thesuperstructurecarriedonsectionsizedrawingup,thebeambridgehasbeenself-possessedwithtwoissueofdeadloadslateralloadendogenforcecomputations,theliveloadendogenforcecomputation,themostdisadvantageousloadcombinationandsoon,examinedforthesubstructurecalculatedlaidthefoundation。Thesubstructureusesthereinforcedconcretepillar,theboardstylehollowpillar.Thefoundationusesboredpilesandboredpilingirrigation.Thisdesignusesallowedthestresslawbridgethesubstructurecarriesonthedesignregardingthisandexaminescalculated.Tothefoundation,receivestoreceivetheplatenaccordingtotherigiditytocarryonthedesigncalculation,separatelypressestheearthtothepiletheresistanceandthepilebodymaterialstrengthcalculatesthesinglepileaxialtoallowthesupportingcapacity,examinesoutsidecalculatedundertheloadfunctionthepilebodystabilityandthematerialstrength,examinecalculatesthepilethecrackresistance.Andcarriesonthefoundationsettlementandthepillartothebridgepiergoesagainstthehorizontaldeparturetoexaminecalculated.Thefinalcomputedresultindicatedthat,theabovealleachitemexaminescalculatedconformstoeachcorrelationstipulationrequirement.Keywords:Bridge，Substructure，Pier，Pile