Injection of material into the ground uses a small diameter PVC pipe through the ring zone occupied by the drilling pipe shaft to carry a microphone for controlled development of the injected column

摘要

The assembly for a high pressure injection into the ground, such as a cement suspension, has a conventional pipe (PE) of polyvinyl chloride (PVC) in a small diameter, with a microphone (M), within the ring zone (R) which was occupied by the drill pipe shaft. An injection column (1,N) is formed by high pressure injection at a pressure of 400-700 bar over the whole length of the drilling from the edge at ground level to the bottom edge of the drilling.