Features and application: pared with metallic corrugated pipe, it is acid resistant, alkali resistant, aging proof, electric erosion proof and has high rigidity, less friction, good sealing property and flexibility and no seepage for water or paste. It is not easy to be broken by digging bar and convenient for connection in construction. 2.Developed on the basis of foreign advanced technology, it fills the technical gap in this field. 3.Mainly used in various kinds of large-scale buildings, bridges and other constructions with high collapsing possibility.