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";s:4:"text";s:2666:"Bridge 4 is a twin-leaf, Chicago-type bascule bridge, with its counterweights located under the road deck. Bascule bridges have counterbalance weights positioned either in the deck or in overhead This animation shows the movement of a double-leaf bascule. Bascule Bridge Design and Construction. [2], The rolling lift trunnion (sometimes a "Scherzer" rolling lift), raises the span by rolling on a track resembling a rocking chair base. The name comes from the French term for balance scale, which employs the same principle. A bascule bridge is a type of drawbridge consisting of two counterweighted leaves or spans which pivot upward on a horizontal axis to allow boat traffic to pass underneath. A flood in 1849 swept away a number of floating bridges and drawbridges proved to be too narrow to accommodate the influx of people traveling thro… The earliest movable bridge in Chicago was a drawbridge at Dearborn Street built in 1834. Bascule bridges are the most common type of movable span because they open quickly and require relatively little energy to operate, while providing the possibility for unlimited vertical clearance for marine traffic. You can view samples of our professional work here. Bascule bridges have been in use since ancient times. The bridge shown consists of a moveable deck (C-D), tie rods (A-D), a balance frame including counterweights (A-B-E), and a portal support frame. 18th Jul 2018 Construction Reference this Disclaimer: This work has been submitted by a university student. As a second condition the virtual line between pivot B and the centre of gravity of the whole balance frame E, • Tower Bridge in London, perhaps the most famous and iconic bascule bridge of all time However, it was not until the adoption of steam power in the 1850s that very long, heavy spans could be moved quickly enough for practical application. The river top was 17 feet below the rail tops on one side and of the bridge and 16 feet below on the other. If there is a hinged connection, it's referred to as ophaalbrug (literally "drawbridge"). requires use of an elevated bridge or use of a couterbalance pit to lengthen the counterbalance arms. If the pivot points are positioned to the rear of the back of the deck then most of the rubbish on the deck can be prevented from entering the pit when the deck is raised. Bascule bridges have counterbalance weights positioned either in the deck or in overhead balance frames (as shown) to assist in the lifting operation of the deck. The fixed-trunnion (sometimes a "Chicago" bascule) rotates around a large axle that raises the span(s). [4] It was patented (1901) by Theodor Rall. ";s:7:"keyword";s:21:"bascule bridge design";s:5:"links";s:718:"Kim Kyu Jong Wife, Why Is Cactus Cooler So Expensive, Glasgow Caledonian University Application Login, Kristina Keneally News, Fuse Adobe, 1970 Milwaukee Brewers Roster, ";s:7:"expired";i:-1;}