1.Corrugated Metal Pipe Culvert 2.Specifications can be afford 3.Small ... The application fields of Ribbed Unitary Steel Reinforced Corrugated Metal Pipe1.Highway and railway: culvert, passage, bridge, tunneling overhaul, temporary ... utility tunnel, optical cable protection, drainage pitch3. Water conservancy: culvert, passage, bridge, pilotage pipeline, drainage pipeline4. Coal mine: minerals ...