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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.
The plates provide a surface with a low coefficient of friction which can be attached to a supporting structure. This combination provides support while simultaneously allowing an object to move (slide) freely along the supporting surface. [1] The plate may be of polytetrafluoroethylene (PTFE),TEF-MET, [2] Lubrite [3] or steel according to the ...
The old Federal Bridge had 25 feet of vertical clearance for boats, requiring it to open several times per day. The new bridge will have a vertical clearance of 42 feet, a change that should ...
Attempts have been made to increase the safety of bridges with pin and hanger assemblies by adding some form of redundancy to the assembly. Retrofits that add redundancy to pin and hanger assemblies include adding a "catcher's mitt"—a short steel beam attached to the bottom of the cantilevered girder that extends out beneath the suspended girder to "catch" the suspended girder should ...
The bridge was built with a drawspan in the center that could open for boats too tall to go under the bridge. [15] The bridge opened by raising two 100-foot-long (30 m) steel grids about 7 feet (2.1 m) and moving an adjacent pontoon beneath them. [16]
There are several types of bridge protection systems used: [7] Pile-supported fender system on the James P. Houlihan Memorial Bridge. Fender systems attached to the pier with the goal to absorb the vessel impact. Their ability to withstand a typical ship collision is low.
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The United States Army's 299th Multi-role Bridge Company, USAR deployed a standard ribbon bridge across the Euphrates river at Objective Peach near Al Musayib on the night of 3 April 2003. The 185-meter bridge was built to support retrograde operations because of the heavy-armor traffic crossing a partially destroyed adjacent highway span.
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