A box girder bridge is a This article is about the edifice. For other meanings, see Bridge (disambiguation). Sydney Harbour Bridge - probably the best known of suspended deck compression arch bridges A bridge is a structure built to span a gorge, valley, road, railroad track, river, body of water, or any other physical obstacle. The purpose...
bridge commonly used for roadway flyovers and for modern elevated structures of light rail transport. They may be fabricated from post-stressed concrete or sheet steel plate. If of concrete, they may be cast in place using falsework supports, removed after completion, or may be prefabricated (as is the steel plate type) in a fabrication yard, then transported and emplaced using cranes. The later method is often used in situation where access for construction is limited to times of light traffic, which may be detoured around the work area using only a limited number of lanes.
Since most early bridges of this type were constructed largely of wood, it is typical that they are either formed from treated wood (typically using creosote) or are protected with a roof and enclosed in building-like siding, forming a covered bridge.
These rope bridges must of course be periodically renewed owing to the limited lifetime of the materials, and rope components are made and contributed by families as contributions to a community endevor.
A bridge type combining elements of a suspended-deck suspension bridge and a cable stayed bridge has been proposed as a replacement for the eastern span of the San Francisco-Oakland Bay Bridge and would be the largest bridge this type constructed.
Feeds |
Contact