United States Department of Transportation
i
Assessment of the "Bridge in a Backpack" bridge system from Advanced Infrastructure Technologies (AIT).
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2014-12-01
[PDF-2.39 MB]
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Abstract:The Vermont Agency of Transportation (VTrans) installed a Bridge in a Backpack (BiaB)
system, or also referred to as a Rigified FRP Tube Arch (RFTA) Structure on a low volume
road in a rural setting. The value of using this system is the potential to use smaller and
lighter construction equipment for a restricted delivery location such as forest or farm roads.
The BiaB does not require large cranes and there is a potential for in-field fabrication of the
tube arch members where large truck delivery is limited. Advantages of the system include
good waterway characteristics and suitability for ledge controlled or spread footings.
Disadvantages of the system are that few have been constructed and that it has aesthetic
limitations.
The construction of the Fairfield BiaB project proceeded smoothly. Generally, site conditions
and limited experience with the BiaB led to less than ideal means and methods for
construction of the system. During construction, it was noted that several opportunities
remain for further expedited construction and cost reduction. Generally, VTrans’ experience
with the BiaB showed that the system provides a benefit to the State.
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