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.
- 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.
- 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
Construction Cost: $49,000,000