Greensburg Pike Bridge Demolition

Location: Turtle Creek, PA
Owner: Allegheny County Department of Public Works
General Contractor: Brayman Construction Corp.
Value: $20.28 Million
Date Complete: November 2014

Brayman was contracted to replace the existing seven-span steel truss bridge spanning Turtle Creek and three active Norfolk Southern rail tracks located in Allegheny County, PA.

Scope involved construction of a new four-span 663’ steel girder bridge just downstream of the existing bridge. Abutments and piers are founded on drilled shafts, ranging in diameter from 48“ to 114” and with depths over 100’. Project required 1.8M lbs of structural steel, 600,000lbs of rebar and 4,000cy of concrete.

A major component of the project included the design/build of two retaining walls at Abutment 2 to support the new bridge approach roadway in the historic landslide prone areas.

Wall #1: Anchored Cast-in-Place facing Wall on Caisson Foundation

  • Length: 321’-3” long
  • Height: variable 8’ to 38’
  • Caissons: 28ea, single row, variable diameter 48”-54” drilled shafts & rock sockets, depths 30’ to 65’ at variable spacing
  • Anchors: 43ea, 5-strand anchors, lengths 125’ to 140’ at variable spacing; using ground and platform mounted drill rigs
  • Facing: CIP Reinforced Concrete, 2’-6” thick, Antigraffiti Coating; with Barrier, Sidewalk, and Protective Fence on top
  • Temp Shoring: Sheet Pile Wall

Wall #2: Concrete Cantilever Wall on Caisson Foundation

  • Length: 108’-0” long
  • Height: variable 12’-6” to 26’-6”
  • Caissons: 20ea, two rows, diameter 36” drilled shafts & 30” rock sockets, depths 45’ to 63’ at variable spacing
  • Footer: Three steps, 3’0” thick x 15’-0” wide, variable lengths
  • Facing: CIP Reinforced Concrete, battered 1’-6” thick at top, Antigraffiti Coating; with Protective Fence on top
  • Temp Shoring: H-Pile & Wood Lagging Wall

Additional work items
• Bituminous approaches
• Drainage, landscaping
• Guiderail, curb, and sidewalk
• Highway lighting, signing, pavement marking, and signals
• Railroad relocation, sewer relocation, utility installation
• Demolition of existing structure