"crumlin" - 1 õppematerjal

Bridges presentation

mass-poured concrete. Most notable of the early trestles was the Portage Viaduct in the USA (1852), a remarkable timber structure designed by Silas Seymour, carrying the Erie Railroad over the Genessee River, 234ft (71m) above the water and 876ft (276m) long (Figure 14). It was destroyed by fire in 1875, to be replaced in iron, and later in steel. One of the first iron viaducts was the 1673ft (510m) long Crumlin Viaduct (1857), constructed by Thomas W Kennard and designed by Charles Liddell for the Newport-Hereford line, 217ft (66m) above the Ebbw Vale in Wales (UK). It served as the prototype for later ones, such as the Viaduc de la Bouble (1871), a series of lattice girders on cast-iron towers flared at the bottom, built under the direction of Wilhelm Nordling. It was 1296ft (395m) long by 216ft (66m) high on the Commentry-Gannett line in France.