Precast concrete bridge assembly
A bridge assembly comprises a plurality of one-piece precast reinforced concrete bridge sections each formed by parallel space side walls integrally connected by an arcuate top wall. The side walls define a span between fifty and seventy five feet, and the top wall has a radius of curvature between sixty five and eighty feet. Each bridge section has a rise between the bottom of the side walls and the top of the inner surface of the top wall between ten and fourteen feet, and the outer surfaces of the side walls have a height between five and nine feet. Curved surfaces connect the inner surfaces of the side and top walls and have a radius of curvature between five and seven feet. The radius of curvature of the top wall is at least five times the rise and seven times the height of the side walls.
1 - 12 . (canceled)
13 . A bridge assembly comprising a plurality of one-piece precast concrete bridge sections, each of said bridge sections including substantially parallel spaced side walls having generally vertical outer surfaces, an arcuate top wall integrally connecting said side walls of each of said sections and having a generally uniform thickness, said side walls of each of said sections having opposing inner surfaces defining a span greater than fifty feet and less than seventy five feet, said arcuate top wall of each of said sections having an inner surface with a radius of curvature greater than sixty five feet and less than eighty feet, each of said concrete bridge sections having a rise defined between bottom surfaces of said side walls and a top inner surface of said arcuate top wall greater than ten feet and less than fourteen feet, and each of said side walls of each of said sections having an outer surface with a height greater than five feet and less than nine feet.
14 . A bridge assembly as defined in claim 13 wherein each of said bridge sections has an inner curved surface connecting an inner surface of said arcuate top wall and an inner surface of each of said side walls, and said curved surface has a radius of curvature greater than five feet and less than seven feet.
15 . A bridge assembly as defined in claim 13 wherein each of said bridge sections has opposite end surfaces defining a length less than one tenth of said span.
16 . A bridge assembly as defined in claim 13 wherein said arcuate top wall of each said bridge sections has a radius of curvature greater than five times a rise defined between bottom surfaces of said side walls and a top of said inner surface of said top wall.
17 . A bridge assembly as defined in claim 13 wherein said radius of curvature of said top wall is greater than seven times a height of substantially vertical outer surfaces of said side walls.
18 . (canceled)