PennDOT’s First SPMT Bridge Move: Shaler Street Bridge

April 16, 2020 1:00 pm

Louis J. Ruzzi, P.E., District Bridge Engineer, PennDOT District 11-0; Matthew E. Cochran, P.E., Senior Structural Engineer, H.W. Lochner, Inc.; and Shane Szalankiewicz, P.E., Structure Control Engineer, PennDOT District 11-0

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Featured Presentation: PennDOT’s First SPMT Bridge Move: Shaler Street Bridge (35 Minutes)

Description: The 2019 Shaler Street Bridge Replacement Project in Pittsburgh, PA was PennDOT’s first use of the Self-Propelled Modular Transporter (SPMT) technology. The use of this technology was made possible by a $400,000 grant from FHWA. The SPMTs placed two 70-ft-long steel girder superstructure spans, creating a new two-span bridge as a replacement for the existing three-span bridge crossing SR 19. This move was unique because of the complicated site conditions in an urban area. The new superstructure spans were erected on temporary abutments in an adjacent parking lot. Each span was built on a 14% grade to match existing conditions. The move day was coordinated with ongoing SR 19 roadway reconstruction project activities and around Pittsburgh Steeler home football games. Varying cross slopes and steep vertical grades on the roadway required construction of a temporary compacted stone move path, which carried the superstructure spans over the newly constructed substructures units, under aerial utilities, and past an adjacent building with only a 13-inch horizontal clearance. This presentation will discuss choosing the right location, design and construction details, public outreach, and lessons learned.

 Presentation Photos/Graphics:

1) Existing Shaler Street Bridge

2) Span 2 leaving the staging area

3) Span 2 approaching final location

4) Span 1 minimum horizontal clearance

5) Shaler Street Bridge move complete

6) Shaler Street Bridge complete with closure pours

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