We create these piles by intersecting concrete piles. We chose to make these concrete with either steel or steel beams through a process called angering. Evergreen Enterprises offers two types of these secant piles: primary and secondary piles. We use CFA technology, or continuous flight angering, to allow for resistance using secant piles. We install these for deep foundational support and for retaining structures and elements. Moreover, we use these for a variety of engineering constructions such as framed bridgeheads and walls of underground storeys. The company uses these to support excavations and also to create barriers to groundwater flow.