Bridgehead for pit, has frontal wall associated to chase, and two intermediate walls parts extended between lateral walls on entire length of chase, and including upper edges having identical profiles at upper edges of lateral walls

摘要

The bridgehead has a frontal wall (1) associated to a chase (3) including a base (4) and lateral walls (5) in a single piece with the frontal wall. Two intermediate walls parts (7.1, 7.2) are provided in a single piece with the base and extended between the lateral walls on entire length of the chase. The intermediate walls parts include upper edges (8.1, 8.2) having identical profiles at upper edges (6) of the lateral walls and are spaced with respect to each other. The intermediate walls have wall parts spaced with respect to each other in a longitudinal direction.