Excavation tool for forming column of consolidated soil, has nozzles arranged along edge of radial blade elements, nozzles communicating with opening in central shaft and directing high pressure jet downwardly

摘要

The excavation tool (20) includes a tubular central shaft (21) with a vertical axis (x) and a central axial aperture (21a) for supplying a ground-consolidating fluid to nozzles (32) which are directed outwardly and arranged along a lower radial edge one or more blade elements (22) which project radially from the central shaft (21) and are inclined to it in a helical configuration. The nozzles (32) direct high pressure jets (33) of consolidating fluid for fluidizing and breaking up the soil before it is engaged by the blade elements (22) in their excavation movement. Independent claims are included for a method for forming a column of consolidated soil.