SR 28 1SR 28 2

SR28 Widening

Location: Pittsburgh, PA
Owner: PennDOT, District 11
General Contractor: Brayman Construction Corp.
Value: $22.2 Million
Date Complete: May 2012

Brayman was contracted to widen PA State Route 28, section A50, located near downtown Pittsburgh. The 9,482lf project site started just north of the Chestnut Street Overpass (16th Street Bridge and East Ohio Street Intersection) and extended to just south of the 40th Street Bridge, with the majority of work occurring along River Avenue and the Norfolk Southern Railroad tracks.

Components of the work included the following:
• New three-span precast I-beam ramp bridge
• New four-span precast I-beam ramp bridge
• 91-span, 12’ wide precast trail bridge
• Pier reconstruction at 31st Street Bridge
• Railroad track relocation
• Building demolition
• New retaining walls parallel to SR28
• New retaining walls along River Avenue
• Regulation of fill handling/disposal
• Replacement of 36” DIP combo sewer & 12” DIP waterline
• Installation of 18”/24”/36”/48” storm drainage
• Subgrade preparation/geogrid installation
• Driven H-pile, 34,600lf
• Drilled Micropile, 2,600lf

Prior to the start of major construction, Brayman demolished numerous buildings located on the hillside lining the inbound side of the highway. This project is an excellent demonstration of utilizing micropiles for low headroom and limited access situations. Foundations for Railroad Crash Wall 18B-2 required drilling and pressure grouting 86ea, 9 5/8” diameter micropiles, most of which were battered 14°.

Performance testing verified 172kip design load capacity. All work was done under the existing 31st Street Bridge, around existing bents supporting the River Avenue Viaduct and with continuous traffic above.

In addition, a significant amount of driven/drilled piling was necessary to support construction of Ramp E - the three span bridge; Ramp D - the four span bridge over the Norfolk Southern Railroad; Walls 10A and 10B; and Soldier Pile Wall 18A, as well as the half-mile long elevated structure built over the edge of the riverbank.

Ultimately, the Route 28 improvements will provide a free flow connection, without any traffic signals, between Kittanning, the City of Pittsburgh (I-279, I-376, & I-579), and beyond to the Pittsburgh International Airport. Alternate forms of commuting - biking, hiking and walking - also realized an improved connection with the addition of the pedestrian bridge which now links over 21 miles of trail along all three rivers in Pittsburgh.