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see bridgebridge,
structure built over water or any obstacle or depression to allow the passage of pedestrians or vehicles. See also viaduct. Early Bridges

In ancient times and among primitive peoples a log was thrown across a stream, or two vines or woven fibrous ropes (the
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At the entrance to fortifications, a bridge over the moat or ditch, hinged and provided with a raising and lowering mechanism so as to hinder or permit passage.
See also: Bridge



a bridge with a movable span to permit the passage of ships. Drawbridges are usually built across rivers traveled by large ships when conditions make it technically and economically inadvisable to construct a bridge on high piers and with long approaches. The movable span of a drawbridge can be of the vertical-lift, swing, bascule, balance-beam, or rolling-lift type; the choice of type depends on local conditions. Construction of a drawbridge span requires either massive piers or towers to house the mechanisms and engines required for moving the span. Electric and hydraulic drives are the most common, and drawbridges are often equipped with backup drives from internal-combustion engines. The movable span generally has light-duty structural members, with trusses or beams of steel or lightweight alloys.


Kryzhanovskii, V. I. Razvodnye mosty. Moscow, 1967.


(civil engineering)
Any bridge that can be raised, lowered, or drawn aside to provide clear passage for ships.


At the entrance of fortifications, a bridge over the moat or ditch, hinged and provided with a raising and lowering mechanism so as to hinder or permit passage.


a bridge that may be raised to prevent access or to enable vessels to pass
References in periodicals archive ?
Detailed job description Submission, project execution and construction management for the execution properties New retaining wall as a pre-investment for urban walking and Veloberbindung in PJZ and substitute the new draw bridge SBB.
After crossing over a draw bridge and entering into the castle's guard tower, guests quickly discover the only way out is through a labyrinth of ominous caverns.
Replacing an old draw bridge in New York City will cost US$600 million.
Examples of this year's RoboLab models include Trash Can Man, a robot that recognizes recyclable materials; an automated draw bridge inspired by The Three Billy Goats Gruff that captures unsuspecting billy goats; and a motorized crane that helps Peter Pan rescue children from Captain Hook.
In 1900, the family spent four summers there, living in the Alston Tower, while a whole range of craftsmen -- stonemasons, craftsmen, carpenters -- toiled on the 6-story, 120-room castle that had a powerhouse, a dovecote, a draw bridge and an Italian garden.
The next stage will include demolition of the existing draw bridge and sections of the viaduct and construction of replacement structures.
Repairs to the Florence Draw Bridge near Milepost 191 on Highway 101 are planned for Monday through Friday.