| 摘要 |
The invention concerns a drop mass soil compaction apparatus (10, 50) which has a supporting frame (12,64) and a mass (20, 76) which can be raised relative to the frame to an elevated position above a soil surface (40, 61) which is to be compacted. The apparatus includes a mass lifting arrangement for raising the mass to the elevated position such that when the mass is subsequently dropped from such position it impacts on the soil surface in order to compact it. The mass lifting arrangement includes a flexible cable (24, 92) attached to the mass and an hydraulic or pneumatic actuator (36, 68) which is carried by the supporting frame and which acts on the cable in a manner to raise the mass. The cable effectively isolates the mass lifting arrangement, and in particular the actuator, from shock loads generated by impacts of the mass on the soil surface.
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