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Rapid bridge replacement
Rapid bridge replacement or accelerated bridge construction (ABC) is a technique that allows bridges to be replaced with minimum disruption to traffic. The replacement bridge is constructed on a site near the bridge to be replaced. When it is completed, the old bridge is cut away and removed using self-propelled modular transporters (SPMTs). Then the SPMTs lift the new bridge, transfer it to the work site and put it in place.〔(The ABCs of a Rapid Bridge Replacement in Utah )〕 Often the highway or railroad carried by the bridge is closed for just one weekend. Conventional techniques typically replace half a bridge at a time, with all highway traffic crammed into the other bridge half, often for a year or more, while construction progresses.
Notable rapid bridge replacement projects include Interstate 93 in Massachusetts, where 14 bridges were replaced over 10 weekends in
2011.〔(Did Someone Order an Instant Bridge? ), John Schwartz, New York Times, April 17, 2012〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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