Role of NCC in tunnel construction
NCC designed the segment lining structure for the Aqualine tunnel. The design presented particular challenges due to the need to safeguard the tunnel against large ground and hydraulic pressures and prevent seawater leakage. Moreover, the seismic activity of the area meant that such protection needed to be earthquake proof. The long-bolt system was therefore used for assembling the lining segments, and special sealing measures were taken along the segment joints to make the tunnel lining impervious to seawater.