Abstract:
CFA/ACIP pile is the most used single pass drilling method for deep foundation installation. It is constructed by rotating and driving a Continuous Flight Auger (CFA) into the ground at a controlled speed to the specified pile depth. Concrete is then pumped under continuous positive pressure through the hollow stem of the auger to fill the borehole as the auger is withdrawn. CFA/ACIP piles are preferred due to its high daily production capacity when used in suitable soil conditions.
CFA/ACIP piles have been installed in the United States since decades and there has been a huge development in equipment, installation process, monitoring and furthermore.
Nowadays, installation of CFA/ACIP is using fully computer monitored drill rigs rather than a bulky crane and leads setup. Because of the torque and crowd offered by the rigs, they can be installed to depths in excess of 100 feet and diameters up to 48 inches.
Even bulky cranes are outdated, new age crane-based equipment with leader system is more than welcome. These new age crane-based systems combine the benefits of sufficient hydraulic power, fully equipped software etc. with the additional benefits that they can do single pass without extension systems even when drill depths of more than 100 feet are required.
The paper will explain the construction process and will discuss some jobsite references and experiences made using the new age crane-based equipment.
Keywords: CFA Piles, ACIP Piles,