SHUTTERING FOR THE PRODUCTION OF TUNNEL TUBBING

摘要

The shuttering has side walls (5) which can be pivoted away and a rib on each side wall (5) facing inwards and forming a groove for a sealing frame in the tubbing produced therein. Said rib has a rib bearer (13) which is distant from the side wall (5) and forms recesses (14) therewith. Into each recess is inserted a shaping rib (15) which completes the rib bearer (13) to form a rib. The shaping ribs are elastically deformable. Thus when the side walls (5) and hence the ribs are pivoted away, not only is damage to the tubbing groove just produced prevented but also noses (17) forming recesses in the groove can be provided which are inconceivable in non-deformable ribs owing to the impossibility of moving them out of the recesses.