... metal pipe culverts is processed from carbon steel plate, and is hot dip galvanized as a way of anti- ... , railway, hidden trench for waterways, tunnels, culverts, animal channels, and filter wells.For the load-bearing structure for bridge.Down ... for the city.Underground pipelines.Reinforcement and reconstruction for tunnels, bridges, culverts. ♦Economical and technical advantages:1. High strength: ...