Tunnel lining for use in mountain for e.g. motor vehicle, has heat insulation arranged at seal at inner side of tunnel, where sprayed concrete return layer is partially held with screw i.e. hexagonal screw, in heat insulation

摘要

The lining has a heat insulation made of polyethylene or polypropylene and arranged at a seal at an inner side of a tunnel. A sprayed concrete layer is provided at the tunnel inner side. Sprayed concrete is provided with a sprayed concrete return layer e.g. wire mesh, net or fabric. The return layer is partially held with a screw i.e. hexagonal screw, in the heat insulation. Polyethylene foam channels (4-6) are detached to supply rolls (1-3). Windings of a screw thread of the screw exhibits an inclination of 20 degrees. The windings exhibit a center thickness of 2 mm in a radial direction.