Concrete deck truss bridge and method of construction
AssigneeFigg and Muller Engineers, Inc.
InventorJean M. Muller
Life of this patent
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Abstract
A concrete deck truss bridge and method of constructing same employing precast compression and tension diagonals with the latter having oppositely extending feet at opposite ends so as to define therein surfaces for support of the intervening compression diagonals, and opposite sides of the feet defining anchor blocks for post-tension tendons. Construction proceeds from main span piers toward the mid-span and end span piers under balanced loading, in sequence.
Claims14
A concrete deck truss bridge having at least two end spans and a main span therebetween, comprising a pair of longitudinally spaced apart main span piers, end span piers longitudinally spaced outwardly of said main span piers, pairs of truss beams on opposite sides of said main span and end span piers, each of said beams comprising alternating compression and tension diagonals of concrete, support blocks mounted on said opposite sides of said main span piers, said diagonals including first pairs of said compression diagonals diverging upwardly from lower ends thereof which bear against said support blocks, second pairs of said compression diagonals at the centerline between said main span piers diverging downwardly from the upper ends thereof, upper and lower feet at opposite ends of said tension diagonals, said upper feet extending toward said main span piers from said centerline and from said end span piers toward said main span piers, and said lower feet extending away from said main span piers toward said centerline and toward said end span piers, said feet having bearing surfaces confronting opposite ends of said compression diagonals which are seated against said surfaces, bottom concrete slabs extending between said lower feet and transversely between said diagonals of said pairs of truss beams, and concrete deck slabs extending between said upper feet and transversely between and outwardly of said diagonals of said pairs of truss beams.
A method of constructing a concrete deck truss bridge having a main span defined by a pair of longitudinally spaced main span piers, and an end span at each end of said main span, each said end span having an end span pier longitudinally spaced from one of said main span piers, comprising the steps of constructing pairs of truss beams on opposite sides of said main span and end span piers, each of said truss beams comprising interconnected alternating compression and tension diagonals of concrete, concrete deck slabs and concrete bottom slabs, and each of said beams being constructed by
- (a) starting at each said main span piers, erecting an upwardly diverging pair of said compression diagonals on said opposite sides of said main span pier,
- (b) proceeding toward the centerline between said main span piers and simultaneously toward said end span piers, erecting said tension diagonals as downwardly diverging from upper ends of said compression diagonals, and erecting the remaining of said compression diagonals as upwardly diverging from lower ends of said tension diagonals,
- (c) as said diagonals are erected during steps (a) and (b), installing said deck slabs respectively between said upper ends of said tension diagonals, installing said bottom slabs respectively between said lower ends of said tension diagonals, and connecting a first of said deck slabs to the top of said main span pier,
- (d) said upper and lower ends of said tension diagonals defining upper and lower feet having bearing surfaces for said compression diagonals, during said erecting step (b) of said tension diagonals, extending said upper feet toward said main span piers from said centerline and toward said main span piers from said end span piers, and extending said lower feet away from said main span piers toward said centerline and away from said main span piers toward said end span piers.
Dependencies are inferred from the claim text.