改革开放后,全国村镇公路建设速度很快,连接公路的桥梁,其数字非常惊人。据有关资料统计,1980～1990年全国新建村镇公路桥梁5000万座以上,总投入约在10个亿以上,这个期间所建桥梁90%以上为钢筋混凝土结构桥。经过十几年或二十多年的使用,桥梁出现了不同程度的病症,严重影响了交 After the reform and opening up, the construction of national highway in villages and towns across the country is very fast. The number of bridges connecting the roads is very alarming. According to relevant statistics, from 1980 to 1990, there were more than 50 million newly-built towns and villages bridges and roads in the country with a total investment of more than 10 billion. Over 90% of the bridges built during this period were reinforced concrete bridges. After more than ten or twenty years of use, the bridge has experienced various degrees of illness, which seriously affected the delivery