Historically occupied by wetland marshes and creeks, the subsurface consists of uncontrolled fill over soft soils and silts, making nearby structures especially prone to construction-induced settlements. Underpinning teamed with consulting engineering firm Magnum Geo-Solutions to value engineer the bid design’s specified auger-cast-in-place pile system. The rotary-driven pipe pile was selected to improve cost and schedule while minimizing ground vibrations and maximizing usable space on a small project site.
The rotary-driven pipe pile is a full-displacement pile that does not produce any drill spoils. It consists of a 12.75-inch diameter casing with a sacrificial drill tip and is installed by rotation using crowd and torque instead of by conventional piledriving methods. The casing is filled with concrete after installation.
Did you know?
A total of 320 each production piles were installed 120 feet below ground surface to achieve a 75-ton allowable pile capacity.