| 摘要 |
Block forming apparatus comprises a compression chamber with upper and lower ends. A main ram extends into the compression chamber from the lower end, while an auxiliary ram is mounted on a pivoting arm and can be moved into the upper end of the compression chamber. A soil/cement mixture is introduced into the compression chamber and a precompression stroke is carried out by the upper ram (30), before a main compression stroke is carried out by the lower ram (30). The operating force applied by the upper ram is substantially less than that applied by the lower ram. |
