Drainage System
A drainage system reduces the water pressure behind tunneling face during the excavation process or when water-cutting grout is applied near excavation face. We provide longer distance pipes with a special drill system measuring 60.5mm – 114.3mm O.D. For limited surface water leak from the shotcrete surface, drainage along the profile to side ditches with our rib membrane is highly recommended.
Drainage Rib Membrane (Rib Drain)
In certain cases, water may still drip at the water-ingress section of the tunnel even aft ...
Long distance drainage pipe
When tunnel excavation encounters fractured geology combined with the presence of high-pre ...