Bored pile by means of reverse circulation

The reverse circulation drilling method is also known under the name of air lifting drilling. Compressed air is introduced inside the drilling rod just above the tool, hence reducing the density of the drilling fluid and creating a differential pressure that can lift said fluid inside the rods. Mud and debris are then conveyed into a mud container.

Soilmec's RCDS method combines drilling by means of Kelly bar and by means of reverse circulation. The same rig can perform both techniques since the design of the RDC elements assures a quick adaptation, in less than three hours. Drilling starts by using the Kelly bar drilling method, with tools like bucket, rock auger and core barrel; then it continues with RCDS tools, as soon as the soil becomes harder.