CZM’s EK250 CFA is mounted on a Tier 4 Caterpillar Base; CAT 336E. The machine is a Bottom Drive CFA, which allows for deeper depths and higher torque.
The revolutionary patented system Bottom Drive CFA applies to the execution of continuous flight auger piles. The position of the rotary head at the foot of the drilling rig displaces the entire center of gravity of the equipment downwards, allowing a better use of the drill in reaching greater depths and drilling diameters. In this system, the drilling tool – auger – is part of the mechanism of torque transmission, so that notches are opened aligned along its full length. These notches fit the keyways connected to the rotary head which allow for the drilling when the auger is rotated. The Bottom Drive CFA equipment, when compared to those using the traditional system, has the advantage of being much lighter and more balanced, resulting in lower investment with superior performance. Other advantages are the use of friction pull-down for better penetration in hard soil and easy adaptation for the application of telescopic rod while executing excavated piles.