Pit underpinning is a traditional underpinning technique that stabilizes structures prior to adjacent excavation, using concrete and mortar. A limited width pit (panel) is excavated and shored by hand below the structure and extends to the underpinning design depth. The pit is then filled with concrete, leaving several inches of space under the bottom of the structure. Mortar is then packed into the space to provide the load transfer. After the concrete and mortar achieve sufficient strength, additional adjacent panels can be constructed as necessary. The finished, cured underpin allows adjacent excavation to take place.
This technique is predominately provided by our Providence, RI office, and is available throughout North America. Contact your local Hayward Baker office for more information.