Patent ID: 8453413

Claim:
A method for making a waterproof lining in a cavity that is masoned or dug into natural ground, said lining comprising successive sections, each comprising a rectangular thin-wall panel with a length corresponding to a length of the section and a width corresponding to a cross-sectional perimeter of the cavity, positioning each thin wall panel in a flat configuration so as to place on an upper face thereof an inner reinforcement comprising at least a plurality of corrugated bands parallel to a longitudinal axis of the panel and spaced apart from one another, said bands being welded to the upper face of the panel at at least some tops of the corrugated bands, overwinding each thin wall panel using a winding tool comprising two circular plates rotating around an axis, on which plates are fastened ends of a profile arranged on one longitudinal side of the panel, which is wound over more than one turn by rotation of the plates about their axis, the corrugated bands being directed outwardly, introducing the overwound panel into the cavity up to a location of placement and unwinding the panel so as to rest a panel against the lateral face of the cavity at the tops of the corrugated bands, the panel being welded along the two longitudinal sides that have come into contact and along an end transverse side, to a corresponding end side of a section already in place, and injecting a moldable material such as concrete between the thin wall panel and the lateral face of the cavity, so as to embed the inner reinforcement and to secure a thus constituted whole lining, a size and structure characteristics of the thin wall panel and of the inner reinforcement being determined so that said whole lining is capable of withstanding loads applied by outward operational pressures and possible differential settlements of the cavity.