1. Positioning of the tube and forming of a plug to seal the bottom of the first permanent tube. Using a free-fall hammer to compact the plug that causes the lower casing segment to be driven into the soil.
2. Welding of the additional tube elements of limited length and continuation of the driving phase.
3. Driving to the required installation depth
4. & 5. Casting (plastic) concrete
6. Placement of the reinforcement