A Civil Engineering Success
Civil Engineering History and Heritage
U.S. 20 Iowa River Bridge
The Iowa River Bridge on Highway U.S.20 was built in such a way that it not only was able to expand the once two lane blacktop roads into a four lane highway, but also to keep environmental impacts of construction and existence of the bridge to a minimum.
The $21 million dollar bridge consists of two 12.0 m wide deck structures that each contain five spans of 92 m. These deck structures are made from erecting a weathering steel I-Girder superstructure. "Each deck structure will consist of a 230 mm concrete slab with a 38 mm low-slump concrete wearing course supported by a system of four 3450 mm deep I-girders spaced at 3600 mm centers"(1). The support for these structures will be cast-in-place reinforced concrete substructure units. These units consist of two column bents ranging in heights of 20 m to 38 m, and are founded on drilled shafts or driven H-Piles.
Engineering Success
The construction method......
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