PROJECT OVERVIEW
In
2021, W.J. Castle, P.E. & Associates, P.C. completed the design for
replacement of the pedestrian bridge located in a park in Haddonfield, NJ. An
inspection was performed of the structure to determine what could be retained
of the existing structure and best design methods. The existing concrete
abutments were in good condition and were retained to support an entire new
superstructure. The challenges
and limitations of traditional
masonry-veneer construction at mid-rise heights led, ultimately, to consideration
of alternate envelope enclosure approaches.
The
bridge structure has a dam at the site, so maintaining the clearances both
horizontal and vertical was very important. The contractor had to ensure no
interruption of the water flow or damage to the dam during construction
activity. Installation of the precast beams was simple and easy to do working
from adjacent to the site. Avoiding the use of diaphragms or other components
over the waterway was key to the installation of the new bridge superstructure.
PRECAST SOLUTION
The design for precast box beams
allowed for the bridge to accommodate the load ratings needed for park vehicles
as required by the client. Since the dam structure was located right at the
bridge, working in the waterway was dangerous and other bridge superstructures
would have been tricky to install. The precast beams were able to be easily
installed. This material also assisted in the approval of the permit
application.
The client needed the installation to be
completed with minimal site disturbance and for the bridge to be strong and
durable enough to last for many years of use. Precast beams fit the bill
perfectly.
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