Helical Drilling is a geotechnical design/build contractor focused on providing innovative, efficient and adaptable geotechni ... cal engineering and ground construction solutions to general contractors, owners and engineers throughout the Northeastern United States. Helical is an ENR Top 600 Specialty Contractor specializing in Geopier® Rammed Aggregate Pier® ground improvement, earth retention, grouting, deep foundations and piles, underpinning and additional geotechnical construction solutions. read more