THE CARDINAL AT NORTH HILLS
MORRIS-SHEA PROJECT COMPONENTS
24 INCH DIAMETER – 70 PILES
36 INCH DIAMETER – 129 PILES
Morris-Shea installed Continuous Flight Auger (CFA) piles for the deep foundation of the new high rise at The Cardinal at North Hills. The 18 story expansion of the Raleigh, NC senior living facility required the installation of 199 CFA piles to underpin a single level of below ground parking and 191 housing units in the new tower. Morris-Shea drilled 24” and 36” CFA piles to depths of 24’ to 68’ to satisfy all load requirements. Morris-Shea CFA piles provided a deep foundation solution that was economical and environment-friendly. CFA piles also offered a vibration-free, low noise alternative to driven piles when installed in close proximity to existing housing units at The Cardinal.
CFA PILE INSTALLATION METHOD
CFA tooling was advanced with high torque rotation and crowd so installation could proceed rapidly and without over-rotation. The hollow stem of the tooling was connected by hose to a high-powered mobile concrete pump. A self-consolidating, coarse aggregate concrete mix was pumped under pressure (6000 psi) through the CFA tool to the base of the
borehole. Drilling parameters were observed in real time by the rig operator utilizing Morris-Shea’s Automated Monitoring System. The AME display presented the volume of concrete being placed. It also provided the rig operator with a target extraction rate that ensured the construction of a quality monolithic concrete shaft.