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- Translated from French, “trunnion” means “pivot point” and “bascule” means “seesaw.” Also known as the “Chicago Style,” the bridge's leaves are suspended on axles (trunnions), with massive concrete counterweights located below the bridge, in the riverbank pit.
www.architecture.org/online-resources/stories-of-chicago/chicagos-movable-bridges
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What is a bascule bridge in Chicago?
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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.
Dec 19, 2019 · These are excellent examples of Chicago’s bascule bridges—essentially a moveable bridge that lifts up with the help of a counterweight.
Sep 30, 2013 · Chicago engineers modified the bascule (French for seesaw) bridge to come up with the perfect design. The trunnion bascule design, also known as the Chicago Bridge, is popular in river cities throughout the world.
Watching a Chicago drawbridge rise is magical. Learn how Chicago-style bascule bridges work by viewing three famous bridge lifts, including the DuSable Bridge, and explore how the Chicago River shaped the city's bustling 19th-century port.
The DuSable Bridge (formerly the Michigan Avenue Bridge) is a bascule bridge that carries Michigan Avenue across the main stem of the Chicago River in downtown Chicago, Illinois, United States. The bridge was proposed in the early 20th century as part of a plan to link Grant Park (downtown) and Lincoln Park (uptown) with a grand boulevard.
In a double-leaf bridge the bascule offers an effective barrier against highway traffic going off the roadway into the river, a class of accidents common with the swing bridge. The bascule can be erected without interruption to land or water traffic.
Translated from French, “trunnion” means “pivot point” and “bascule” means “seesaw.”. Also known as the “Chicago Style,” the bridge's leaves are suspended on axles (trunnions), with massive concrete counterweights located below the bridge, in the riverbank pit.
