This final phase of the Tri Boro Expressway bridge replacement is replacing the T Span section which connects the East Pittsburgh and McKeesport communities to the Expressway. The T Span itself crosses over Turtle Creek, and both Norfolk-Southern and Union Railroads.
McCrossin Foundations drilled and installed six 72-inch diameter shafts with 66-inch rock sockets through hard siltstone, clayshales, limestone, and sandstones. The rock sockets varied in length from 50 to 75 feet as the caissons were installed on a hillside adjacent to the Union Railroad and active Tri Boro Expressway. The shafts were tested for quality using Cross Hole Sonic Logging and for cleanliness prior to concrete placement with a MiniSID. A Self Consolidating Concrete Mix was specified for the drilled shafts to provide for uniform flow throughout the shaft due to the tight spacing of the reinforcing cage steel.
Job Name: Tri Boro Bridge T Span Replacement
Job Location: Turtle Creek, Pennsylvania
Job Type: Drilled Shaft Foundations
Start Date: October 2012
Completion Date: November 2012