我国早在1888年就开始了铁路钢侨的建造,现在快近100年了,但由于以往我国处在半封建半殖民地社会,技术进步十分迟缓,建桥所需的材料、设备、部件全由外国进口,施工大多靠外国公司承包,每条线路上的桥梁,采用不同国家的技术标准及规 As early as 1888, China began to build railway steel bridges. It is now nearly 100 years. However, due to the fact that China was in a semi-feudal and semi-colonial society, its technological progress was very slow. The materials, equipment, and components required for the bridge construction were all foreign. Imports and construction mostly depend on foreign companies for contracting, and the bridges on each line adopt different national technical standards and regulations.