See Here
https://canvas.instructure.com/eportfolios/2091962/cashuxzq980/Micropile_Deep_Foundation_Solutions_Nj_De_Shore_Systems_Group_L_Lc_Deep_Structure__Ecological_Construction
The stack is constructed by first making use of the cutting blade to pass through the dirt to the required design deepness. As the complete size helical blade is withdrawed from the hole, it takes the soil along