| 摘要 |
A slip-form machine serves to cast hollow bodies, in particular pipes of concrete or a similar material, substantially vertically by means of successively progressing zonewise vibration compression. The machine comprises inner and outer slip-form mould parts (9, 10), respectively, which are displaced axially with respect to each other during the casting process. The inner mould part (10) is divided into at least two sections (17, 18) interconnected via one or more elastic spacers, and the uppermost one (17) of these contains at least one vibrator. The natural frequencies of the outer mould part (9) are significantly different from the frequency of the vibrations which are generated by the vibrator. By means of the above-mentioned structure it is now possible to cast e.g. concrete pipes in a faster working cycle, with much smaller investments in moulds, and with a smaller energy consumption than known before. The pipe moreover has a completely uniform quality in the longitudinal direction as well as along the periphery and can be cast with much narrower longitudinal and diameter tolerances than before. |
