（双语）钢轨的类型

TypesofSteelRail土木工程检测技术专业教学资源库钢轨的类型LearningResourcesforSurveyingTechnologyforCivilEngineeringMajorsTypesofSteelRail钢轨的类型1.ChemicalcompositionsofSteelRail钢轨化学成分2.CrossSectionofSteelRail钢轨的断面3.TypesandSizesofSteelRail钢轨的类型及尺寸TypesofSteelRail钢轨的类型Led-in导入TheNan-Guanghigh-speedrailway,whichconnectsGuangxiandGuangdongProvinceofChina,isthemaintrunklineforeconomydevelopmentbetweenthosetwoprovinces.TherailroadsectionofNanning-Guigangisaraillineforpassengertraffic,whichisadoptedanewtypeofsteelrailwithnoboltholes,and100minlengthand60kg/minweight.Q：Whatarethechemicalcompositionsofsteelrail?钢轨的化学成分是什么？南广高铁跨桂、粤两省区，是两广交通经济大动脉。南宁-贵港段为客运专线，钢轨采用100m定尺长、60kg/m无螺栓孔新钢轨。TypesofSteelRail钢轨的类型1.Chemicalcompositionsofsteelrail钢轨的化学成分(1)Mainchemicalelements:ironandcarbon以铁和碳为主(2)Beneficialelements:manganese,silicon,chromium,nickel,molybdenum,andetc.有益元素：锰、硅、铬、镍、钼等(3)Harmfulelements:phosphorusandsulfur有害元素：磷和硫等钢轨的断面TypesofSteelRail钢轨的类型2.CrossSectionofSteelRailheadwebfootheadwebfoot以每米钢轨大致质量kg/m表示；TypesofSteelRail钢轨的类型钢轨的类型及尺寸3.TypesandsizesofSteelRailTypesofsteelrail类型Classifiedby：表示方法theweightoftherailpermeter(kg/m)Maintypes：主要类型75kg/m、60kg/m、50kg/m。TypesofSteelRail钢轨的类型钢轨的类型及尺寸3.TypesandsizesofSteelRail(2)Sizesofsteelrail尺寸TypesofSteelRail钢轨的类型1.ChemicalcompositionsofSteelRail钢轨化学成分2.CrossSectionofSteelRail钢轨的断面3.TypesandSizesofSteelRail钢轨的类型及尺寸3.什么是持力层？什么是下卧层？地基是有一定深度和范围的，当地基由两层及两层以上土层组成时，通常将直接与基础底面接触的土层称为持力层；在地基范围内持力层以下的土层称为下卧层（当下卧层的承载力低于持力层的承载力时，称为软