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Strank Memorial Bridge

Location: Johnstown, PA
Owner: PennDOT, District 9
General Contractor: Brayman Construction Corp.
Value: $16.5 Million
Date Complete: April 2012

Brayman was awarded a contract by PennDOT for the rehabilitation of the Strank Memorial Bridge located in Johnstown, PA.

Originally, scope included rehabilitation of the existing nine-span steel bridge and the replacement of an adjacent three-span overpass bridge.

However, deteriorating elements of the substructures required more than rehabilitation in order for the project to obtain positive and lasting results. Therefore, Brayman teamed with the design firm L. Robert Kimbal to propose an alternate plan. The value engineered solution eliminated both the nine-span and three-span structures with no impact to traffic during the construction phase.

Approved re-design involved construction of a new eight-span steel plate girder bridge on an adjusted alignment. The new structure, with OAL of 763lf, spans four tracks of the Norfolk Southern Railroad and the East Branch of the Conemaugh River. Ultimately, over the life span of the new structure, this option will save the taxpayers in excess of $10 million.

In order to allow construction for the new bridge to begin, Brayman first performed demolition of six commercial structures.

Brayman’s specialty foundation expertise addressed geotechnical challenges presented on the site with various substructure elements.Installation of caissons were required for Piers 1 - 5. Steel H-piles were driven at Abutment 1 and for the CIP Wall at Wing B. Drilled micropiles were provided at Abutment 3. MSE walls on spread footings were constructed at Wing A, Wing C, and Wing D. Abutment 2 required a traditional spread footing.

As the existing overpass crossed rail tracks carrying 80 trains per day, during the dismantling process Brayman utilized temporary support towers and two Liebherr LTM-1400-7.1M cranes with MAX-ER trays to lift almost 500,000 pounds conventionally and still maintain these valuable track lines.

Utilization of the jacking towers allowed the truss to be dismantled in four separate sections. As scheduled, Brayman safely completed these operations by removing each of the four segments over four different, four hour time periods while maintaining adjacent traffic.