July/August 2023 - 89

Completed bridge
FEATURE ARTICLE
Unique Anchor Pile SOE System
This project included the replacement
of the Long Island Railroad (LIRR)
Atlantic 6 Bridge in New York City,
which services rail traffic and spans
the Van Wyck Expressway and
frontage roads . The br idge replacement
was part of an overall
project to widen the Van Wyck
Expressway between Kew Gardens
and John F. Kennedy Airport, which
serves as the major route for vehicular
traffic between the airport and the city.
The rai lroad bridge crosses the
expressway and frontage roads in a
significantly congested area, and it
services an average of approximately
140,000 commuters per day throughout
the boroughs of Manhattan,
Brooklyn and Queens. The existing
bridge superstructure and foundations
were to be demolished and new
structures and foundations were
proposed to be constructed at the
bridge's east and west abutments and
center pier. The new bridge would be
supported on driven H-piles.
To facilitate the construction of the
new bridge's abutments and center
pier, a support of excavation design was
required to support the grade around
the existing structures. The design
shown on the contract drawings
included a driven soldier pile and
lagging wall with multiple rows of
drilled tiebacks at the abutments to
laterally support excavation heights of
up to 36 ft (11 m). The existing
abutments are located directly adjacent
to frontage roads that have an
extremely high vehicle traffic volume,
Rail bridge over the expressway
AUTHORSAndrew Stauble, P.E., GEODesign
DEEP FOUNDATIONS * JULY/AUG 2023 * 89

July/August 2023

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