| 摘要 |
The tool comprises a tube enclosed in a cover (12), the lower part of which is open, and provided with a drilling crown (13). As the tube is driven down into the ground, the drilling crown progressively and gently fills it with soil. The tube is of plastics or other diffusion-tight material, and after its two ends have been sealed, the culture earth can be stored for a long time without fear of chemical action. The outer cover (12) containing the tube is driven into the ground by thrust and/or rotary movements, with the tube held free of the latter type of motion, and fixed in its position by a cover (15) and a thrust edge (132) at the top and the bottom of the outer cover (12). (Provisional Basic advised week 84/40) |
