Movable bridges are designed and constructed to change its position and occasionally its shapes to permit the passage of vessels and boats in the waterway. In American English, the term is synonymous with drawbridge, and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms. The present paper describes developments in the design of the most common types of movable bridges – Bascule bridges and Swing Bridges. The selection of design concepts is influenced by span, foundation conditions as well as environmental issues. Application of modern hydraulic systems and. This article describes the advantages of movable bridges, the origins of misalignment in these bridges, and the various problems created by misalignment in rolling lift, vertical lift, and trunnion bascule bridges. Due to the movement of the decks, systems and their controls are required for the operation of the bridge.
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