Bridges to Prosperity Suspension Footbridges
Bridges to Prosperity (B2P) Suspension Footbridges are customized footbridges developed using local knowledge and materials to be locally appropriate and as cost effective as possible. B2P aims to provide isolated communities with access to necessary places over impassable rivers.
Haiti, Guatemala, Honduras, Panama, Peru, Nicaragua, El Salvador, Bolivia, Liberia, Mali, Rwanda, Sudan, Zambia, Malawi, Kenya, Ethiopia, Nepal, Timor-Leste.
Bridges to Prosperity with the help of numerous implementing partner organizations.
Average project cost is $25,000 USD.
Goal #11: Sustaianable cities and communities
Isolated rural communities restricted by an impassable river or water source.
Individually installed. B2P collaborates with local partners and communities to develop alternatives for many bridge components.
End users are urged to contact a local NGO or Bridges to Prosperity directly if they feel there is a need for a bridge in their community.
Varies bridge by bridge depending on the locals’ needs and setting. B2P provides an open-source, technical manual about building locally viable, efficient footbridges in rural areas under a variety of topographic and community conditions. The following considerations are sourced from the manual and influence bridge design:
1. Traditional Crossing Point: The bridge site should be selected at or near an existing crossing point
2. Estimated Bridge Span (L): The bridge span for the most common types of bridges designed by B2P are limited to 120m for suspended bridges and 84m for suspension bridges.
3. High Water Level (HWL): absolute highest point noted by the community, including such cases as a hurricane or other large flood events.
4. Approximate height differential (ΔH): elevation difference between the two proposed tower locations. The final design dictates that the height difference between the towers is not more than 4% of the span, but up to 3 meters of additional tiers may be added to equalize differential.
5. Water Table: Determines if the anchor will be submerged or not.
Monitoring and maintenance is provided by local communities that are trained by Bridges to Prosperity. B2P provide communities with the knowledge and tools to evaluate the basics of bridge maintenance. Following project completion, the community and local government are responsible for monitoring their footbridge and performing basic upkeep. Communities are trained and responsible for replacing deck panels and recognizing when additional support may be necessary.
B2P leverages professionals to conduct technical inspections and provide support for upkeep as needed.
Bridges are constructed using local materials to ensure that replacement components can be locally sourced by bridge committees. The use of local resources allows for bridge upkeep by the community.
No Bridges to Prosperity bridge has failed yet in use. No warranty, since the local communities become the proprietors and are heavily involved in the building and maintenance of the bridge. Interview with representative
Rapid construction schedule – as quick as eight weeks with community participation. Safe and effective bridge construction suited to local conditions.
Bridge design and construction follows standard practices and is guided and reviewed by professional, certified engineers. No Bridges to Prosperity bridge has failed yet in use.
B2P worked with Portland State University’s SWEETLab to develop a remote monitoring SweetSense device that monitors pedestrian traffic, indicating daily use and tracking variations in traffic and use patterns throughout the year. The monitoring allowed B2P to evaluate and analyze the impacts of a bridge on a given community. Results are not in the public domain.
B2P Partners support the design build process. Partners include: Bridges to Prosperity Engineering Corporate Partners: Flatiron Construction, ARUP, Balfour Beatty, Black & Veatch, Buckland& Taylor LTD., CH2M, EE Cruz and Company, Flint Neill, HILTI, International Bridge Technologies, Inc., Kiewit, McNary Bergeron & Associates, PCL Construction, Robins & Morton, Ross Construction, Shoemaker & Haaland Engineers, T.Y. Lin International, The Pike Company, Thornton Tomasetti, VSL International Ltd., Hochtief, Turner Construction
A safe work environment is an essential component of bridge construction.
Shucksmith, M., Social exclusion in rural areas: a review of recent research Aberdeen, Scotland: University of Aberdeen; [cited 2015 Jul 31].
Strasky, J., Stress ribbon and cable-supported pedestrian bridges. London, England: Thomas Telford Publishing; 2005. 237 p.
Lebo, J., Schellin, D., Design and appraisal of rural transport infrastructure. World Bank Technical Paper. 2002 Apr 15-19;496:1-96
Bridges to Prosperity has their own certification process that people can access if they are planning a footbridge project.
Technical inspections, community monitoring reports and remote sensing technology have been deployed to evaluate bridge functionality and use.
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