Power’s crew and 100-ton derrick barge driving a 30-inch by 140-foot long steel pipe pile for the
ferry terminal’s promenade
Power’s 100-ton derrick barge driving 80 24-inch and 36-inch steel pipe pile throughout the
lagoon area, which will support the new 17,000-square-foot granite plaza
“In 2017, we had a second barge onsite to simultaneously drive
piles with the D.B. Alameda. This was a Manitowoc 4100 that was
positioned on top of Flexi Floats. As for the hammers, we used both
the APE 400 and 600 vibratory hammers.”
Additionally, the project scope included an “indicator pile” program.
“Eight of the piles were 147 feet long, which is five feet longer
than our typical piles for the structural deck and were observed
by the geotechnical engineer to confirm the piles reached a dense
sand layer,” said Van Meter. “The vibratory hammers were provided
by American Pile Driving Equipment. The piles were fabricated
by Skyline Steel, as well as XKT Engineering. And, ABC (Abrasive
Blasting & Coating) completed the epoxy coating of the piles.”
PROJECT SPOTLIGHT
Pile driver Jason Pleasants spotting a 30-inch
steel pipe being driven using the Super Kong
APE 600 vibratory hammer
“This expansion is
integral to further
developing and
defining San
Francisco’s public
infrastructure for
the future, and
PEC is excited to
be part of it.”
– David Mik, Power
Engineering
Construction
Since the project is in close proximity to historic structures
on the waterfront, the PEC team implemented a monitoring program
that included crack gauge monitoring on the Agriculture
Building placed on conspicuous cracks; vibration monitoring
using seismographs positioned next to the Ag Building and Ferry
Building; settlement and drift monitoring using continuous GPS
monitors placed on the Ag Building; as well as weekly surveys of
the area surrounding the jobsite noise monitoring using Sound
Level Meters.
“We also have a biologist onsite during pile driving to monitor
for sea life,” added Van Meter. “All driving is temporarily stopped if
they enter a designated exclusion zone.” t
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