Driven piles consist of either end bearing or friction piles ranging from lightly loaded wood piles to high capacity steel or concrete piles driven into most types of soil, to depths of over 100 feet in some cases. The piles are installed using impact or vibratory hammers which are mounted on leaders hung from our cranes or excavators. Drilled Shafts and auger-cast piles are concrete pilings case with concrete in predrilled holes with or without reinforcing. These pilings are capable of supporting highly concentrated loads and are often used on vibration sensitive projects.