drawbridge

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drawbridge:

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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.

drawbridge

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

Drawbridge

 

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.

REFERENCE

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

drawbridge

[′drȯ‚brij]
(civil engineering)
Any bridge that can be raised, lowered, or drawn aside to provide clear passage for ships.

drawbridge

drawbridge
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.

drawbridge

a bridge that may be raised to prevent access or to enable vessels to pass
References in periodicals archive ?
This is definitely "Building Drawbridges for Tomorrow.
The keys gave access to the Tower's drawbridges as well as conference rooms and a restaurant, according to the Historic Royal Palaces, which runs the site.
To do that, you will have to raise or lower drawbridges and, if necessary, shoot arrows at the attackers.
That's getting close to the 25-nm limit at which the laws of quantum physics will allow electrons to leap across transistor drawbridges even when they're open.
Drawbridge (named for the railroad drawbridges over sloughs at both ends of the marshy island) got its start around 1880, when the South Pacific Coast Railroad stationed a bridge tender here.
That was almost like another period of isolation for Japan," Price says, referring to the Tokugawa era of seclusion (1600-1868), when Japanese shoguns literally pulled up the drawbridges and refused any contact with the outside world.
This last leg takes you over two rusted drawbridges into Jersey City, taking a turn past my favorite carpet store where several mutilated statues of loggers stand outside.
Medieval castles had protective moats, drawbridges and secret chambers called keeps.
The idea may conjure images of medieval drawbridges, but these high-tech gates won't protect citizens from foreign invaders.
The total purchase price for Drawbridges and Oasis was $450,000, comprised of $400,000 in cash, which may ultimately be funded through the Company's credit facilities, plus a one-year $50,000 note.
95) republishes the second revised edition of a 1983 classic survey of foot bridges, latticework and drawbridges alike.
Kobke paints gatehouses and drawbridges of the Citadel a vast fortress built to defend Copenhagen's harbour with a hypnotic sense of time slowed to a snail's pace.