Implement and method for stabilising and exploring soft subsoil

摘要

The core of the invention is a displacement tip designed as a tapered slide at the end of a pipe driven into the ground. When the pipe is withdrawn, an annular gap opens up through which a granular paste or a dry powder penetrates into the cavity produced by the withdrawal. When the pipe is advanced again, the granulate is displaced and compacted together with the surrounding subsoil; axial and torsional vibrations assist this action without disturbing the sensitive environment. The implement is pressed in by a protective and guide pipe and is repeatedly withdrawn and advanced for injecting and compacting the granulate in various working positions. The implement is set up as a pump with drive and control members. The same implement also serves as a probe so that the type and quantity of the granulate can be adapted. A group of injection rods of this type can be fed in such a way that economically optimum, reliable and careful stabilising occurs. Rods or pipes for further improvement, reinforcement or test monitoring can subsequently be inserted into the column-shaped improved areas.