Experience has taught us that concrete linings in wet tunnels are soon damaged by water leakage through cracks and construction joints. In course of time the water flow causes erosion of the concrete lining by washouts and frost action. The concrete linings in wet tunnels therefore require a waterproof membrane to maintain the bearing capacity of the lining and to avoid water leakage in the tunnel. For many years asphalt- and tar-felts have been pasted to an inner concrete lining to obtain a waterproof tunnel. The results are good, but the execution is time-consuming. New artificial materials such as PVC- and butyl-layers are now used on a large scale. In the Swiss method, a layer of foam rubber is bolted to a gunite lining by discs and the impervious PVC-layer is welded to them. A butyl-layer stuck directly to the inner concrete lining has been tested, but the final results have not met the expectations. With the intention of reducing the membrane expenses, we have proposed a membrance consisting of at least four layers of PE-foil held to the inner lining of concrete or gunite by means of steel ribs. The layers are mounted in pairs with a joint overlap between the pairs of approximately 1 metre. Neither welding nor gluing is required. This simple method has been tested in a couple of road tunnels. The sealing properties so far are satisfying and the cost is essentially lower than other membrane constructions. /Author/

  • Corporate Authors:

    Norwegian Road Research Laboratory

    Postboks 8109, Gaustadalleen 25
    Oslo,   Norway 
  • Authors:
    • Skogseid, A
  • Publication Date: 1975-9


  • Norwegian

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00131567
  • Record Type: Publication
  • Report/Paper Numbers: No. 48
  • Files: TRIS
  • Created Date: May 14 1976 12:00AM