| 摘要 |
It comprises blades (4; 5) directed downwards and fixed radially to the lower face of a support plate (1) which is attached to an upper ring (3). The width of the blades (4; 5) decreases towards their lower free end. Between the said blades (4; 5), there are placed deflectors (7) directed upwards and outwards. The upper surface of the support plate (1) is attached to means (2) for fastening to a pile-driving machine. <IMAGE>
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