Improvement is a process for the embodiment of the steps in particular of the echelons has, on the elements for puissards control during molding.

摘要

The method involves providing a shaped hub and outer shell between which the concrete is poured. It involves axial movement of the hub (1) and a rake (50) and complete closure of the hub by an obturator head (15) and vertical partitions (21,22). The shell is held closed by guides (A-C) which are retained in alignment by a vertical post (43) actuated for controlled movement.