| W2 Tower Foundation - Yerba
Buena Island
Malcolm Drilling was selected to help construct the
W2 tower foundation (composed of 4 large diameter shafts)
located on Yerba Buena Island for the new Bay Bridge.
The drill rig, a Casagrande C-60 weighing over 260,000
lbs was disassembled into 3 major sub-assembles and
lowered into the new footing and reassembled. After
completion of the drilling the removal was done in the
reverse manner. The actual drilling took place in a
newly blasted excavated footing that measured 60 ft
by 80 ft.
Drilling consisted of 4 piles 2.5M diameter into 33
ft of 20,000 psi rock. Hartfuss and Bauer provided special
drilling tools. Drilling took place 25 ft below water
level.
Drilling operations proceeded 24 hours per day 7 days
a week.
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