"dixville" - 1 õppematerjal

Bridges presentation

This became the great advantage. The principle also is applicable to other bridge types such as arches, an example being the Eads Bridge, where the width, depth, and current of the mighty Mississippi prevented the erection of falsework. In 1877, C Shaler Smith provided the first practical test of the principle when he built what then was the world's longest cantilever over a 1200ft (366m) wide and 275ft (84m) deep gorge of the Kentucky River near Dixville, Kentucky (USA). The cantilever resolved the difficulty of erecting falsework in a deep wide gorge. The anchor arms were 37.5ft (11m) deep Whipple trusses that extended 75ft (23m) beyond the piers. From these were hung 300ft (91m) semi-floating trusses fixed at the abutments and hinged to the cantilever, making the overall span from pier to abutment 375ft (114m). The bridge was rebuilt in 1911 by Gustav Lindenthal using the identical span lengths, but with trusses twice as deep.