Secondary lining of the Skärholmen Tunnel in Stockholm

Works on the secondary lining of the Skärholmen highway tunnel, built by daughter company SBT Sverige AB, continue by the final layer. The surface of the ceiling is made of concrete sprayed onto an insulation membrane and a steel reinforcement. The mixture with the admixture of polypropylene fibers is applied in three layers, the total thickness of concrete is 120 millimeters.