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Animation showing the operation of a drawbridge. A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat.In some forms of English, including American English, the word drawbridge commonly refers to all types of moveable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the ...
Many of the houses were later merged, into 91. In the seventeenth century, almost all had four or five storeys. All the houses were shops, and the bridge was one of the City of London's four or five main shopping streets. The three major buildings on the bridge were the chapel, the drawbridge tower and the stone gate.
A bridge on the Lancaster Canal, featuring coping stones linked by large metal "staples".. Coping (from cope, Latin capa) is the capping or covering of a wall. [1] A splayed or wedge coping is one that slopes in a single direction; a saddle coping slopes to either side of a central high point.
The largest masonry bridge in the United States is the James J. Hill Bridge over the Mississippi River, built in 1883 by railroad magnate James J. Hill, who wanted to impress his fellow citizens by building a structure that would honor him. It is 752.5 meters long and has 23 limestone arches with a full arch span of 23.49 meters.
The Pont du Gard (c.19 BC), Nîmes; 3 rows of piers with arches springing from them to support the bridge. A pier, in architecture, is an upright support for a structure or superstructure such as an arch or bridge. Sections of structural walls between openings (bays) can function as piers.
The bridge rotates slowly laterally, allowing pedestrians to remain on the bridge while it is rotating. [1] The design includes a barrier on the western side to prevent entry, while, on the eastern side, pedestrians can step on and off the bridge while it is in motion. The speed of the bridge opening and closing is 0.15 m (0.16 yd) per second. [3]
An abutment is the substructure at the ends of a bridge span or dam supporting its superstructure. [1] Single-span bridges have abutments at each end that provide vertical and lateral support for the span, as well as acting as retaining walls to resist lateral movement of the earthen fill of the bridge approach.
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers).For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.