J. Derenzo Co. of Brockton, Mass., faced a formidable challenge, creating the 610 North and 610 South sections of a new structure for Massachusetts Institute of Technology's commercial real estate arm. Not only did equipment have to work in tight quarters, but excavating a multi-level garage beneath the nine-story structure created a need for high productivity in low-overhead conditions.
Creating 610 South, the Derenzo crew used an original XL 5200 Gradall to excavate under the building's corner braces with just 11 feet of headroom - possible only with a telescoping Gradall boom. As 610 South moved into the steel erection phase, work began on the garage and foundation beneath 610 North, presenting the same digging and structure challenges but with a greater productivity need.
We knew we needed a second Gradall to double the digging production, said John Bowen, project superintendent. A new XL 5200 III worked in tandem with the existing XL 5200 to excavate as well as help lift and place 22,000-pound W-section walers and pipe corner braces. "The picking and handling power of the booms - tilting, telescoping in and out and swinging over the sides without decreasing the lifting power - lets us service pile drivers in setting their pieces faster," said Bowen. "We do not have to set the pieces down, reposition the machine, re-rig the piece and lift it again like we would have to do with a conventional excavator."
Also, Bowen noted, while the pile drivers fit and drop corner braces, XL 5200 models can get back to digging. "It's a process that allows us to use a Gradall 75 percent of the time to dig out more dirt to get down to the next level vs. a conventional excavator, where it would be a 50/50 split and we would need another machine in the hole to keep up with the aggressive schedule."
For more information about Gradall excavators call (800) 445-4752.