Phoenix Project #1802
In the summer of 2019, Phoenix completed a challenging jet grouting project in Providence RI. Over 60 columns were installed in four critical locations, directly adjacent to a 78″ brick sewer and underneath an active utility duct bank. Column diameters of 4 to 5 feet were achieved using pumping pressures of up to 400 bar (5,800 psi).
A combination of vertical and battered jet grout columns were required as a result of the orientation of subsurface utilities. In addition to the presence of two sensitive utility structures, the installations were further complicated by limited headroom imposed by a nearway highway viaduct.
The work required numerous pieces of specialized equipment and tooling, including a Soil Mec SM-14 rotary drill rig equipped with a Jean Lutz automated control system and data logger, a Metax jet grout pump with high pressure lines, a Scheltzke grout mixing unit and ancillary agitating tank, two bulk cement silos, jet grout drill rods, monitors, and nozzles.
Once completed, the jet grouting successfully created closures of four “windows” in a perimeter steel sheeting system, providing continuity of both groundwater cutoff and temporary earth retention.