SR 0021- A10, Masontown Bridge Replacement

SAI was responsible for the design location study, preliminary engineering, final roadway and structure replacement design, and construction consultation for the replacement of the Masontown Bridge on a new alignment over the Monongahela River and Norfolk Southern Railroad in Fayette County, Pennsylvania.

Physical features:

  • 1,700′ seven-span (main spans with 14′ girders) weathering steel multi-girder bridge over the Monongahela River and Norfolk Southern Railroad.
  • Bridge deck includes two 12′ lanes with 8′ outside shoulders and 4′ inside shoulders and a solid 2′-6-1/4″ concrete median barrier that comprise approximately 122,400 sq. ft. of deck area.
  • Overall project length is approximately 1 mile including all associated roadway work.

Other features:

  • Substructure components include multi-column bent on single-row drilled shaft foundations (pier 1, 2, 5, 6), and solid wall-type piers consisting of four individual columns extended from individual 3′ diameter drilled-shafts (pier 3 & 4). Abutment 1 is a full-height conventional reinforced concrete abutment without a backwall, while abutment 2 is a stub-type conventional reinforced concrete abutment with a backwall and standard U-wingwalls.
  • Two-phase construction with middle deck pour to accommodate large girder camber.
  • Bracing design with 3-D modeling and analysis.
  • Drilled-shaft river piers permitted small cofferdam footprint with significant cost savings.
  • Performed Osterberg Cell Testing on 9′ diameter drilled-shafts to 24,000 kips.
  • Thermal monitoring and control heat of hydration for mass concrete pours.
  • Scour analysis, hydraulic design, and hydrologic studies.
  • Community involvement.
  • Demolition plan.
  • Navigation lighting design.
  • Permit acquisition and agency coordination.
  • Erosion and sedimentation control plan.
  • Signing and pavement marking plan.
  • Traffic maintained with half-width construction.

Client Owner: Pennsylvania Department of Transportation, District 12-0
Completion: 2015
Construction Cost: $49,000,000

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