... Corrugated Steel Culvert1.Highway and railway: culvert, passage, bridge, tunneling overhaul, temporary sidewalk2. Municipal works ... optical cable protection, drainage pitch3. Water conservancy: culvert, passage, bridge, pilotage pipeline, drainage pipeline4. Coal mine: ... . Military use: military sidewalk, air-defense passage, evacuation passage Technical data Specific DataMaterial: SS400 or Q235 ...