1. Position the SFA rig over proposed pile position.
2. Commence augering into ground to design depth. The auger and soil held within the flights supports the sides of the pile bore during this phase. An expendable cap or flap on the bottom of the lead-flight prevents soil entering the hollow stem auger.
3. Once design depth it reached, concrete or group is pumped to the base of the pile bore through the SFA system and through the hollow stem of the flights. As the auger is extracted, the pumped concrete maintains stability of the pile bore. No voids are created during this process.
4. Once concrete is placed and arisings removed from the pile position, the pile cage is lowered into the wet concrete.