(57) This publication describes a slipforming extruder for production of hollow-core concrete
elements (23), movable in respect to a casting bed (4) and comprising a frame (18)
which is movable, e.g. supported by wheels (19), and provided with at least two adjacent
auger flights (2, 25) with flights (5) and a core-forming mandrel (3), attached to
the final end of each auger flight (2). Furthermore, the machine comprises a primary
drive and power train system (7, 15, 16, 17) for rotating the auger flights (2) and
a feed apparatus attached to the frame (18), e.g. a hopper (1), for feeding the auger
flights (2) with the concrete mix to be cast. According to the invention, a secondary
drive and power train system (8...14) moves the adjacent auger flights (e.g. 2 and
25) in a synchronized and counterphased reciprocating manner in the axial direction.
Because the machine disposes of core vibration, it achieves a low level of generated
noise.
|
|
