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Madison Street Bridge, a bascule bridge over the Chicago River in Chicago, IL The Rode Brug (Red Bridge) across the Vecht river in Utrecht, Netherlands The Marine Parkway–Gil Hodges Memorial Bridge in New York City. A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats [1] or barges. [2]
The bridge may be stiffened by the addition of cables that do not bear the primary structural or live loads and so may be relatively light. These also add stability in wind. An example is the 220-meter-long (720 ft) bridge across the river Drac at Lac de Monteynard-Avignonet: this bridge has stabilizing cables below and to the side of the deck.
When extended, it resembles a conventional steel and timber footbridge, and is 12 metres long. To retract the bridge, the hydraulic pistons are activated and the bridge curls up until its two ends join, to form an octagonal shape measuring one half of the waterway's width at that point.
The renovators at the Massachusetts Highway Department also scored the concrete surface of the sidewalk on the bridge at 5-foot-7-inch (1.70 m) intervals instead of the conventional 6 feet (1.83 m). [18] The Lambda Zeta (MIT) chapter of Lambda Chi Alpha, which created the smoot markings, continues to repaint the markings once or twice per year ...
The bridge's 58 anchors all feature 3-inch-thick (7.6 cm), 1,000-foot-long (300 m) steel cables and are divided into three types: 45 587-short-ton (533 t) fluke anchors used in softer soils deep in the lakebed; eight 107-short-ton (97 t) gravity anchors used in solid soils nearer to the shore; and five 10-foot-diameter (3.0 m), 79-to-92-foot ...
A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
The moving bridge had two bascule leaves, each 48 feet (15 m) long that were connected by a 69 feet (21 m) long deck-girder approach, for a total overall length of 372 feet (113 m). [6] The girders were 40 feet (12 m) in width; which were wider than the 37.5 feet (11.4 m) bascules. [6]
A vertical-lift bridge or just lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck. The vertical lift offers several benefits over other movable bridges such as the bascule and swing-span bridges. Generally speaking, they cost less to build for longer moveable spans. [1]