Pre-augering is commonly used to loosen the soils and thus reduce driving resistance to aid installation in difficult and hard conditions. Generally taken to the full depth of the specified sheet piles, a flight of augers is drilled in and then back-spun out to minimise spoil arisings, as the objective is not to empty the pile bore. The technique offers greater accuracy and installation speed, allowing the use of lighter pile sections, and reducing ground borne vibrations. Pre-augering may even offer the potential to use sheet piled solutions where they may otherwise be precluded due to difficult underlying strata.
All our ABI leader rigs have the latest docking systems offering quick change over times between auger drives, vibratory and impact hammers and hydraulic pressing equipment.