Arrangement for lining tunnel arch for water and frost protection

摘要

The steel arches (13) are formed with two parallel ridges (20,21) which are directed towards the insulation material. Pressure loading components (31) are arranged on the side of the insulating material opposite to the steel arches. They exert an elastic pressure against the insulating material. A reinforcing network (37) for anchoring the layer of spray concrete is fixed in the pressure loading components.The steel arches are W-shaped with a flat central piece (19). The pressure loading component (28,29) comprises rails which have a U-shaped profile and are turned with their backs towards the insulating material.