A method and a device for introducing a tubular assembly into the soil, which assembly consists of two or more elongated strips with a curved cross-section, made of an elastically flexible material, which strips are unwound from corresponding drums and are being united at adjacent edges when being unwound, and are separated again when being rewound on said drums. The driving force is derived from the rotational movement of said drums. The assembly can be used for introducing drainage tape into the soil, for introducing a sounding probe into the soil, for cutting soil samples and for similar purposes.
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