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 ?
Every home may be someone''s castle, but it''s only when we each let down the draw bridge that we become a community.
Ben Miller of Edison Elementary whipped out a draw bridge with a string-pull mechanism to open the bridge.
Even if Birmingham were to attempt to isolate from the rest of the world, raise the draw bridge and prohibit another single soul from entering the city walls, the demographic trends have already laid root.
Repairs to the Florence Draw Bridge near Milepost 191 on Highway 101 are planned for Monday through Friday.
But if you are only 'somewhere politician' who every now and then keeps turning to Larkana and Garhi Khuda Buksh to mark your political presence and make political statements then you will never turn into an 'anywhere politician' who pulls the lever of the lifted draw bridges down to link all the communities within a given State.
That is what Chesapeake's Public Works Department is doing to address rapid development and all the needs that come with it - better traffic control, new streets or repair of existing roadways, better stormwater management, more efficient refuse collection, and in Chesapeake's case, with more miles of deep-water canals than any other city in the country, repair or replacement of 56 fixed bridges, 4 draw bridges, and 10 overpasses.