Water drain pipe for tunnel

摘要: The utility model relates to a water drain pipe for tunnel. comprises cement with circular cross section, wherein metal protecting plate is arranged on the outer wall of pipe; an antirust paint coated plate; waterproof sandwich layer thickness 5mm bonded inner and polyurethane 1.5mm surface layer. high in strength good performance, i.e., leakage prevented effectively. Therefore, whole safety tunnel improved greatly.