| 摘要 |
The invention relates to an apparatus and a method for producing nozzle jet columns underground comprising a bore and nozzle rod arrangement (1) for producing a borehole and a nozzle jet column in the region of the borehole, and a measuring device (14) for measuring the nozzle jet column, in particular the diameter of the nozzle jet column, the measuring device (14) being at least partially integrated into the bore and nozzle rod arrangement (1) so that it is possible to measure the nozzle jet column using the mechanical measuring device (14) without the bore and nozzle rod arrangement (1) having previously been withdrawn from the borehole.
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