September/October 2021 - 96
Installing drilled pipe pile
for exoskeleton support
locations just below the sidewalk,
required Farrell and Buehler to adjust
the final DPP locations. As with the HP,
the DPP were field adjusted up to 12 in
(305 mm) to miss active electrical
conduits and service boxes. A total of 44
DPP with a 6 in (152 mm) steel pipe pile
core and a 14 in (356 mm) helix were
installed to depths of 55 ft (16.7 m)
within a 14 in (356 mm) diameter fully
grouted column. The DPP load test
produced an allowable capacity of
85 kips (378 kN) with less than 0.1 in
(2.5 mm) deflection; that confirmed the
DPP capacity calculations. Once the exoskeleton
was built and fastened to the
façade walls, the contractor demolished
the rest of the interior of the hotel.
After the interior was demolished
Historic façade wall exoskeleton
for lateral support
and cleared, more site challenges were
presented. A portion of the wood false
work that attached the historic façade to
the steel-frame exoskeleton on the
inside of the hotel encroached into the
vertical space of the piling rig mast for
the installation of the ACPs. Farrell
(203-254-305-356 mm) helix arrangement
to depths of 55 ft (16.7 m), within
an 8 in (203 mm) neat-cement, grouted
column. The HP load test produced an
allowable capacity of 80 kips (356 kN)
with less than 0.5 in (12.7 mm)
deflection; that confirmed the HP
capacity calculations. The versatility of
HP foundations helped complete this
project phase on time.
After the HPs were installed, the
façade walls were shored and braced to
demolish the old foundations and pour
96 * DEEP FOUNDATIONS * SEPT/OCT 2021
new concrete-grade beams under the
historic walls. While the façade walls
were being supported by the shoring
and new foundations, the DPP were
installed in the sidewalk to support the
temporary steel-frame exoskeleton.
The temporary exoskeleton frame had
stringent lateral deflection requirements
to preserve and strengthen the
historic façade walls during demolition
and construction. The discovery of old
stacked, brick foundations, with
visually confirmed, active utility
Auger cast pile construction inside historic façade walls
September/October 2021
Table of Contents for the Digital Edition of September/October 2021
Table of Contents
September/October 2021 - Intro
September/October 2021 - 1
September/October 2021 - 2
September/October 2021 - Table of Contents
September/October 2021 - 4
September/October 2021 - 5
September/October 2021 - 6
September/October 2021 - 7
September/October 2021 - 8
September/October 2021 - 9
September/October 2021 - 10
September/October 2021 - 11
September/October 2021 - 12
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