Patent ID: 8573893
Filing Date: 2013-11-05
Classification: E02D

Abstract:
1. An injection head for injecting pressurized fluid consolidating mixtures into a soil to form consolidated areas of soil, the head comprising: a single upper inlet pipe for receiving fluid from a set of tubular rods which can be mounted above the head, at least a first pipe having a curved intermediate portion which connects the upper inlet pipe to at least one lateral injection nozzle, at least a second pipe for conveying a fluid from the inlet pipe to a lower outlet pipe which is connectable to a drilling tool, valve means responsive to pressure of the fluid injected into the head to cut off the flow of the fluid towards the lower outlet pipe, the valve means comprising a plug facing the inlet pipe; wherein the at least a second pipe extends from a passage which is closable by the plug to the lower outlet pipe; and wherein the valve means are located in a position downstream of the upper inlet pipe and above, or upstream of, the at least one lateral nozzle and the at least a second pipe, wherein when the plug completely blocks the passage, a flow of pressurized fluid consolidating mixtures injected in the inlet pipe is taken entirely through the at least first pipe towards the at least one lateral nozzle, while flow of pressurized cement mixture injected in the inlet pipe cannot reach the at least a second pipe; wherein the valve means comprises return means for bringing the plug back to an open condition when the injection pressure is below a predetermined level.