| 摘要 |
Method for hollowing out holes in the ground, characterised in that in the first instance a threaded cone 2 is screwed into the ground, which cone constitutes the lower part of a component 1 the upper part 4 of which is provided with means allowing the fitting of a tool serving to screw the component 1 into the ground, the said component 1 being extracted from the ground in the second instance by virtue of the said tool serving as a lever resting on a support 10 placed on the ground. <IMAGE>
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