Patent ID: 8662795

Claim:
A head for injecting consolidating pressurised fluid mixtures into the ground to form consolidated soil portions, the head comprising: an outer cylindrical body defining a central, longitudinal axis; an upper inlet for receiving fluids from a string of tubular rods mountable above the head; a side outlet nozzle lying in a plane substantially perpendicular to the longitudinal axis; a helical duct defining a helical central line, the helical duct connecting the upper inlet to the nozzle to impart the fluid flowing through the helical duct a helical motion about the longitudinal axis towards the nozzle; wherein the helical duct is progressively tapered towards the nozzle, and the helical duct includes a terminal length which is radiused to the nozzle in a tapered manner; wherein said helical duct is delimited internally or towards the longitudinal axis, by a cylindrical surface of a central tubular core having an axial central cavity for the passage of a fluid, and wherein an inner cylindrical surface of the outer body peripherally delimits the helical duct, a rigid body being fixed in the outer body and forming at least one helical channel providing a pair of facing helical surfaces, including an upper surface and a lower surface.