| 摘要 |
<p>For a tubbing made of concrete for lining a tunnel in particular a traffic tunnel the tubbing has a convexly curved outer surface and a concavely curved inner surface opposite the outer surface and the tubbing is provided with a thermoplastic barrier layer on the outer surface of the tubbing. The thermoplastic barrier layer is also arranged on all sides of the outside surfaces facing the outer surface. The tubbing preferably has a recess that extends around the outer surface in a frame shape and the barrier layer engages in the recess.</p> |
