| 摘要 |
A machine serves to cast concrete pipes substantially vertically by means of successively progressing zonewise vibration compression. The machine comprises inner and outer mould parts (11, 12) which are displaced axially with respect to each other during the casting process. The inner mould part (11) is divided into at least two sections (13, 14) which are interconnected via one or more elastic spacers (15), and which are adapted to rotate with respect to each other. Further, the lowermost section (14) is firmly or rotatably fixed in a stationary or axially slidable part of the machine. The conical portion (19) is moreover provided with a multi-thread screw (20) for compressing the vibrated concrete. By means of the above-mentioned structure it is now possible to cast e.g. concrete pipes having a well-defined higher and more uniform quality throughout the longitudinal direction with a reduced consumption of energy and reduced noise nuisances, than it has been possible in the past to produce with conventional machines of this type. |
