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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 name comes from the French term for balance scale, which employs the same principle.
Fig.3: Single Leaf Bascule Bridge. Fig.4: Double Leaf Bascule Bridge. Bascule bridge is a suitable type of movable bridge for most situations. Not only does it structurally sound and reliable but also both construction and operation can be carried out economically. Vertical Lifting Bridge
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The famous Tower Bridge in London is a combination of bascule and suspension bridge, and is considered as an iconic symbol of the city. Bascule bridges are a type of movable bridge. That is, these bridges have a movable section that rises upwards (on a horizontal axis) to open up and allow the navigation of large ships and other water traffic. The ...
It is believed that these bridges came into existence, mainly to defend or guard castles and towns in medieval Europe. Back then, these were operated by a winch and a counterweight. Moreover, it is also said that a part of the Old London Bridge was a bascule and functioned in the same manner of rising up to allow the passage of tall-masted ships. L...
Bascule bridges have sections that are referred to as a ‘span’ or ‘leaf’, that are capable of being moved or rotated vertically on a horizontal axle-like pin (trunnion). These bridges can be designed as single-leaved or double-leaved. By the name itself it is understood that a single-leaf bascule consists of a single or one movable section covering...
▸ These bridges have three versions or designs, which are the fixed-trunnion, the rolling lift trunnion, and the Rall type. ▸ A fixed-trunnion is one where the counterweights and bridge are on separate pivots. ▸ A rolling lift trunnion has a span base that is similar in appearance to the base of a rocking chair. Thus, here the span is lifted by rol...
In 1906, he won an international competition to design a monumental Bridge across the Inner Harbour in Copenhagen, Denmark, called the Knippel Bridge. The double leaf bascule measured 106 feet 6 inches from operating pinion to operating pinion. When closed, the arch halves connected and the bridge acted like an arch bridge under live loading.
1.3.3.1 Bascule Bridges. A bascule bridge is a kind of widely used moveable bridge whose main girders can be lifted together with deck about the hinge located at the end of the span. Depending on the bridge width, the bascule bridge can be designed as either single or double leafed.
Jun 3, 2021 · The outright longest bascule bridge in the world is the Chief John Ross Bridge located in Chattanooga, Tennessee. Crossing the Tennessee River, it boasts a bascule span length of 359 feet. It is also the longest rolling lift bascule type. In the closed position, the bridge acts as a three hinge braced rib through arch.
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Initial sizing – haunch deck (not at scale) When the section varies depth along its length, usually for bascule bridges, the typical ratio of the height of the support (H) is between / 16 and /20 whereas in the mid-span (h) is between /40 and L/50. 4. Structural Behavior and Load Paths.
