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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]
A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed.
A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats [1] or barges. [2] 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 of English, in which drawbridge refers to only a ...
Two or four hydraulic pillars under the bridge, one or two at each end, raise the bridge deck to allow boat traffic to pass beneath it. [1] In contrast to a lift bridge, where the deck is pulled upwards along towers, the deck of a table bridge is pushed upwards by otherwise hidden pillars. [2]
The high number of complex moving parts – fourteen hydraulic rams, numerous precision bearings, and an underground machinery chamber to provide the required oil pressure – can be seen as an example of overengineering, and has led to maintenance failures where the bridge is unable to move for significant periods of time.
Broadwater Bridge, across the Richmond River - built using the renovated bascule span from the demolished Barneys Point Bridge on the Tweed River (New South Wales), converted from counterweight to hydraulic ram lift. Bridge on Franklin Wharf, Constitution Dock, Hobart; Marina Bridge - Bridge over Auckland Creek, on Bryan Jordan Dr, West Gladstone
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
[1] [2] Designed to be lifted using hydraulic cylinders and to be higher than the existing bascule bridge at the harbour mouth, it serves both as a new link for the arterial roads in the area, such as the A12, and as a means to try to reduce traffic congestion that frequently occurs in Lowestoft.