热镀锌钢波纹涵管热镀锌涵管波纹涵管直径2米衡水椭圆形

In highway construction, the history 热镀锌钢波纹涵管热镀锌涵管波纹涵管直径2米衡水椭圆形of using metal corrugated culvert instead of reinforced concrete culvert construction has been more than 100 years. In 1896, the United States took the lead in the feasibility study of metal corrugated culverts and culverts. Later, in the construction of highways in the United States, Canada, Australia and other countries, metal corrugated culverts were used for the construction of culverts. In 1990, the design of the Japanese expressway standardized and formulated the technical specifications for the design of Guanhan. With the installation and use of metal bellows around the world, the versatility of this structure in various applications has been demonstrated. After China's reform and opening up, Shenzhen and Datong coal mines began to import finished metal bellows from abroad to carry out culvert construction. Afterwards, the Shanghai Municipal