Complicating the installation further, geotechnical reports showed very inconsistent soils and a potential dense layer 38-55 feet below grade. Site conditions required that installation had to be accomplished without any disturbance of nearby marshland, with a potential penalty of $10,000 for violation. This made installation of Cantsink helical piers the ideal solution because they avoided the need for heavy machinery that could have encroached on the marshland.
Cantsink helical piers are installed with a skid steer, which is less expensive to mobilize and easier to maneuver on the site. The Foundation Firm’s engineer recommended using a 2 7/8” pipe shaft galvanized with an 8/10/12-inch triple helix, which had to be carefully maneuvered through a layer of organics. Finally, work had to be coordinated with tidal flows, which intermittently interfered with visibility and work requirements in the pre-dug footings.