热镀锌波纹涵管厂家 衡水力能新材

the requirements for use. Because the corrugated steel pipe culvert has strong deformation ability, its requirements for the basic materials are relatively low, and it is generally not necessary to adopt a concrete foundation, and gravel can be replaced and filled. However, the foundation of the area such as expansive soil and collapsible LOESS should be treated with water isolation according to needs. In cold areas, it is best to use natural gravel with certain grades, and the maximum particle size should not exceed 50mm, 74mm or less. At the same time to meet the construction compaction requirements, the minimum strength of the filler, the maximum particle size requirements and the foundation of the freezing requirements of the frozen frozen soil areas generally according to the local frozen depth determined, generally below