Hub drilled 115 three- to five-foot diameter shafts on a steeply sloping job site. Our 200-ton Liebherr 895 greatly simplified the project with its reach and line pull. Our Soilmec R-930 and R-518 rigs drilled holes up to 100 feet deep through clay and till to support a seven-story parking garage.
We installed footings for a sound barrier wall on the refurbished Greenbush Line, the historic passenger railroad serving Boston’s South Shore. The work included placing beams in drilled holes and holding them to very precise tolerances as well as placing the panels.
Hub drilled eight 7’ diameter shafts for two piers and 40 54” diameter shafts for two abutments and socketed them at various depths into rock ranging from very hard Dedham granite to nearly completely decomposed argillite. A 15-foot layer of peat, which causes slurry to disintegrate due to its pH, complicated the job, as did the oddly configured site transversed by two streets with high pedestrian and auto traffic.
We installed 44 core beams in shafts as big as 10 feet in diameter and over 125 feet deep for the Blackfan Research Center in Boston's hospital district. Some of the core beams weighed up to 100,000 pounds to facilitate the project’s top-down construction. Hub’s 200-ton crane, the Liebherr 895, and an APE King Kong Vibratory Hammer, were used to install the 40-foot long casings.
