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Miscou Island Bridge
Shippegan, NB
Eastern Designers (in conjunction with ADI Limited) performed value
engineering, preliminary and final designs for the superstructure,
substructure and erosion control for this $30M, 505 m long structure.
Services included review of shop drawings and consultations during
construction. Technical challenges included 15 m depth of water, severe
tidal influences, major waves and offshore ice. The main structure has
a 160 m centre span flanked by two 110 m spans. The main span consists
of twin haunched plate girders with a haunch depth of 8 m and a midspan
depth of 4 m, with an intermediate floor stringer supported on the sway
frames. The end spans were 60 m and 65 m steel box girders. The
superstructure is supported by 25 m high piers with shaft diameters of
4.8 m. The pier foundation includes 16 m diameter cofferdams that
contain 6.5 m deep footings supported on 4 m of tremie concrete. Due to
the high ice loading (approximately two-thirds that of the
Confederation Bridge), six 2 m diameter caissons were doweled into the
bedrock to anchor the piers. Incorporated into the design were
aerodynamic studies based on site specific wind conditions of one of
the harshest locations in New Brunswick. These studies were used to
analyse the structure’s dynamic wind loading. |
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