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The (non-modular) box girder bridge was a popular choice during the roadbuilding expansion of the 1960s, especially in the West, and many new bridge projects were in progress simultaneously. A serious blow to this use was a sequence of three serious disasters, when new bridges collapsed in 1970 ( West Gate Bridge and Cleddau Bridge ) and 1971 ...
A girder bridge is a bridge that uses girders as the means of supporting its deck. [1] The two most common types of modern steel girder bridges are plate and box. [citation needed] The term "girder" is often used interchangeably with "beam" in reference to bridge design.
Underslung (lower-beam) launching gantry used for Skyline guideway construction (2015). A launching gantry (also called bridge building crane, and bridge-building machine) is a special-purpose mobile gantry crane used in bridge construction, specifically segmental bridges that use precast box girder bridge segments or precast girders in highway and high-speed rail bridge construction projects.
A segmental bridge is a bridge built in short sections (called segments), i.e., one piece at a time, as opposed to traditional methods that build a bridge in very large sections. The bridge is made of concrete that is either cast-in-place (constructed fully in its final location) or precast concrete (built at another location and then ...
In short-span bridges of around 10 to 40 metres (30 to 130 ft), prestressing is commonly employed in the form of precast pre-tensioned girders or planks. [42] Medium-length structures of around 40 to 200 metres (150 to 650 ft), typically use precast-segmental, in-situ balanced-cantilever and incrementally-launched designs. [43]
The new design is a cable-stayed bridge made up of twin precast concrete delta frame segmental box girders that spans 1,661 feet (506 m) across the entire ship channel bank-to-bank, providing 205 feet (62 m) of clearance above the water.
The Sagadahoc Bridge is a four-lane concrete segmental box girder bridge between the City of Bath and the town of Woolwich, Maine, carrying U.S. Route 1 (US 1) over the Kennebec River. It was completed in 2000 to replace the two-lane road portion of the adjoining 1927 Carlton Bridge , which remains in use as a rail bridge.
The bridges are mostly of the box girder design and work with straight or constant curve shapes, with a constant radius. 15-to-30-metre (49 to 98 ft) box girder sections of the bridge deck are fabricated at one end of the bridge in factory conditions. Each section is manufactured in around one week.