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Title	CONCRETE CANTILEVERED BOXES ARE U.S. FIRST
Accession No	00215638
Journal Title	Engineering News-Record Vol. 190 No. 14
Corp. Authors / Publisher	McGraw-Hill Companies, Incorporated
Publication Date	19730405
Description	p. 22-3; Photos(5)
Abstract	POST-TENSIONED BOX GIRDER SEGMENTS MAKE UP ONLY THE MAIN SPANS OF THE BRIDGE ACROSS THE GULF INTER-COASTAL WATERWAY, A 200-FT SPAN FLANKED BY A 100-FT SPAN ON EACH SIDE. A LIFTING RIG AND MATING METHOD ARE BEING USED IN PLACE OF A LAUNCHING TRUSS. THE ERECTION OF THE 10-FT-LONG UNITS PROCEEDS IN BALANCED CANTILEVERS FROM SECTIONS BOLTED ATOP THE PIERS WITH 5-FT UNITS COMPLETING THE ENDS OF EACH GIRDER. THE 27-FT. WIDE WINGED SECTIONS WEIGH UP TO 52 TONS EACH. A 2-FT WIDE, CAST-IN-PLACE STRIP BETWEEN THE GIRDERS WILL COMPLETE THE DECK, TO BE TOPPED BY ASPHALTIC CONCRETE. THE PROCESS OF ERECTION OF THE 84 BOX SECTIONS IS DESCRIBED. TO ASSURE PERFECT MATING WHEN SEGMENTS WERE ERECTED ON A 5-DAY CURVE, THEY WERE CAST AGAINST EACH OTHER ON A 90-FT-LONG BED THAT WAS BUILT ON STEEL BEAMS WITH SCREW JACKS AT EACH END FOR ADJUSTMENTS. CONSTRUCTIONAL EXPERIENCES ARE DESCRIBED AND PROBLEMS ARE DISCUSSED. IT IS HOPED THAT THE PROJECT (WHICH WILL COST $2.82 MILLION) WILL LEAD TO STANDARDIZED ELEMENTS THAT WILL RELIEVE SOME OF THE PROBLEMS OF BUILDING BRIDGES AND VIADUCTS AND DOUBLE DECKING EXPRESSWAYS IN CONGESTED AREAS BY ELIMINATING FALSEWORK. IT IS EXPECTED THAT STANDARDIZATION WILL LEAD TO A DROP IN TIME AND COST.
TRT Terms	Aerodynamic lift ; Asphalt concrete ; Box girders ; Bridge engineering ; Cantilevers ; Construction ; Erection (Building) ; Posttensioning ; Standardization
Other Terms	Asphaltic concrete; Erection; Lifts
Subject Areas	H33 CONSTRUCTION; H25 STRUCTURES DESIGN AND PERFORMANCE
Availability	Find a library where document is available Order Document: http://worldcat.org/issn/08919526
TRIS Files	HRIS
Database	TRIS Online

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