| 摘要 |
In a device for manufacturing an annular concrete workpiece (1), a mould sleeve (6), which is placed on the poured concrete (8) and pressed against the concrete (8) by means of a punch head (5), and which rotates about its axis, is arranged in the annular gap between a mould core (3) and a cope (4) so as to form a centering shoulder (7). To produce defect-free centering shoulders, the mould sleeve (6) forms a protective ring for the centering shoulder (7), which is separate from the punch head (5) and which remains on the workpiece (1) when the latter is removed from the mould. |
