before demolition can commence.
The keystone of the project is foundation
work for the substructure, which
includes two abutments and four sets of
piers. Walsh installed eight 20- to 58-footdeep,
36-inch-diameter drilled shafts at
each pier and 12 at each abutment.
Vance indicated in January 2016
that drilling was a week-and-a-half
behind schedule primarily due to
unexpectedly hard rock and environmental
permitting delays, but he was
confident that Walsh would be back on
track shortly. Despite the unforeseen
challenges, Vance was satisfied with
the drilling production rate.
“Drilling is make or break,” he said.
“Depending on how that goes, it’s
almost how the whole job goes.”
Soil conditions? It’s complicated
Project geologist Bill Bradfield of
Schnabel Engineering’s West Chester,
Pa. office describes the Crum Creek site
as “interesting.”
“We ran the full gamut of drilling
conditions within the span of this
PROJECT SPOTLIGHT
Site geologist Bill Bradfield of Schnabel Engineering measures the depth of a recently drilled shaft beneath the viaduct
CONTINUED ON PAGE 58
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