(57) It comprises a frame defining a cavity adapted to receive concrete mass and reinforced
concrete. The frame is formed by a horizontal bottom (1), side walls (2, 3), end walls
(4, 5) and means (6) for collapsing said walls (2, 3, 4, 5) relative to said bottom
(1) comprising shafts (8) arranged parallel to said walls (2, 3, 4, 5) the ends of
which pass through a plate (9) welded to the above mentioned horizontal bottom (1)
and a plate (10) welded to the wall (2, 3, 4, 5) of the mould frame. There are provided
locking means for locking walls (2, 3, 4, 5) relative to the bottom (1) comprising
pins (14) received within holes (11, 13) formed in the plate (9) and in a plate (12)
welded to said walls (2, 3, 4, 5), preventing them from being collapsed relative to
the mould bottom (1).
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