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Covered Bridge And Waterfall
Photograph - Photography
A scenic view of a covered bridge and waterfall. Thetford Center, Vermont.
Photography by Edward M. Fielding - www.edwardfielding.com
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The Thetford Center Covered Bridge consisted originally of a single span supported by two flanking timber Haupt trusses. In 1963 the bridge was altered significantly; the timber deck structure was replaced by four longitudinal steel beams and a central pier was built under the span. The Haupt trusses now carry only the superstructure of the bridge. Each truss combines a series of timber diagonals and uprights (similar to multiple kingposts) with a laminated plank arch; the arch comprises three layers of heavy planks pegged together vertically.
The abutments were built originally of irregular stone laid dry. During the structural alteration, both abutments were capped with concrete to receive the steel deck beams. The lower part of the west abutment has been faced with concrete. The narrow central pier is built of reinforced concrete.
The bridge is 128.5 feet long at floor level. The ends of the side walls flare upward so that the gable ends overhang the floor about one foot at each portal. The pier stands under the midpoint of the original span. The bridge is 20.5 feet wide and has an 18-foot roadway. The wood floor, which consists of planks laid on edge directly on the deck beams and transverse to them, begins seven feet inside each portal.
On the exterior, the timbers pegged together to form the trusses (and side walls) of the bridge are sheathed with unpainted flush boards hang vertically. One small rectangular window has been cut in the middle of each side wall. The gable ends are sheathed with flush vertical boards painted red. The portal openings are rectangular. The medium-pitch roof, which does not overhang the gables, is covered with corrugated metal sheeting.
June 26th, 2013
Viewed 291 Times - Last Visitor from Beverly Hills, CA on 07/20/2014 at 2:48 PM
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