TechSpan® is one of the most reliable, cost effective precast concrete arch systems available for both fill conditions and cut ‘n’ cover conditions. Terre Armée has developed expertise in optimizing Soil–Structure interaction mechanics to optimise the geometry and minimise section sizes. It is widely used in the construction of bridges, underpasses, conveyance and reclaim tunnels, portals, ammunition storage bunkers and rockfall sheds and shelters. Typically, 15-20 linear meters of TechSpan® can be installed in one work shift.