Assessment and Mitigation Process for Bridge Foundation Reuse – Case Study

Aging bridges and transportation infrastructure in the U.S. present a challenge to Federal and State DOTs, local governments, and other transportation agencies. Reuse of bridge foundations is a viable option for bridge replacement and rehabilitation efforts. Foundation reuse may be a practical technique to reduce project costs, schedule, and environmental and mobility impacts; however, this is not without challenges, including uncertainties in existing foundation geometry and conditions, remaining service life of the substructure elements, and load carrying capacity. These challenges can be managed with appropriate investigations and mitigative efforts. The Willow Valley Creek Bridge located on County Road 209, southeast of Flagstaff in Coconino County, New Mexico was investigated, designed and constructed with reused foundations. The bridge, constructed in 1934 and widened in 1964, was a 104-foot long, 34-foot wide, 3-span structure supported on mortared cut-stone masonry abutments and piers founded on shallow foundations. Original bridge and as-built plans of the widening project are available. Core sampling of the structure supporting elements and foundation strata, and comprehensive non-destructive borehole and surface geophysical testing was conducted to evaluate the foundation system for reuse. Investigations indicated the bridge was founded on limestone bedrock; areas of potential voids or weak material were noted in the substructure supporting elements. To address concerns about these deficiencies, a grouting program was implemented to improve the strength of the bridge substructure. Grouting was monitored during construction to ensure the quality of the construction. This manuscript discusses the foundation assessment, mitigation plan, and construction methods employed to meet design requirements for reuse.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Maps; Photos; Tables;
  • Pagination: pp 54-70
  • Monograph Title: Proceedings of the 69th Highway Geology Symposium (HGS 2018)

Subject/Index Terms

Filing Info

  • Accession Number: 01719276
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 23 2019 9:00AM