How this node works
In two moves: first the slim rod is drilled down to the design depth, with no grout. Then, on the way up, the jet is switched on and the rod is slowly raised while rotating, so the grout cuts and remixes the soil all around into a cylinder. The spoil rises to the surface and is watched — its return tells you the column is forming and the pressure is not fracturing the ground.
Key points
- Rod (drilling down)
- Nozzles
- Jet
- Rising + rotating
- Column formed
- Spoil rising
Conceptual, language-neutral drawing for study and orientation — not an execution drawing. Dimensions and verifications belong to the designer.