Subsoil stabilising unit injects agent via driven hollow shaft - with impeller in subsoil and carried by vertically movable drive assembly

摘要

The mechanism (10) is intended for stabilising, hardening and/or treating a soft soil layer. It comprises a drive motor (21) to rotate a (hollow) shaft (15) which extends downwards into the soil and carries an impeller (14) and parts (not shown) connected to the shaft to inject a stabilising agent (via orifices in the impeller). A further drive motor (27) is provided to raise or lower the assembly carrying the drives (21,27) together with the shaft(s) relative to upwardly extending guide columns (17) (adjustable on horizontal pivot 40 on frame 11 of mechanism 10). A torque sensor may be provided to reverse the lift drive and adjust the shaft angle when the soil resistance exceeds a given level.