Location: Boston, MA
Owner: Liberty Mutual Insurance Company
Completion Date: August, 2011
General Contractor: Turner Construction Company
Vital Statistics: Project Value: $13,000,000
Wall Type: 36” Reinforced Concrete
Wall LBEs: 3' and 4' X 10' LBEs (total of 36)
The new Liberty Mutual tower included a five level underground parking garage. East Coast Slurry Company was contracted to install the perimeter slurry wall and 36 LBEs as part of a top down construction sequence. The LBEs penetrated up to 25' into the argillite bedrock, requiring a hydromill to excavate the rock. East Coast's Casagrande FD 100 mill mounted on a C900 carrier had no problem with the task. Belled caisson foundations from the previous building needed to be removed at depths of 50 feet prior to slurry wall construction. A rotary drill rig was used to core through these existing foundations.