Launching Three Trusses over the BNSFNorthtown Rail Yard

摘要

Minneapolis's historic St. Anthony Parkway crossing of the BNSF Northtown rail yard with five deteriorating Warren trusses required removal and replacement with a new skewed 305-foot Warren truss. The railroad prescribed that trusses over mainline tracks be replaced using a launching system. The new truss incorporates unique redundancy measures including eliminating fracture critical steel truss members and gusset plates and using a post-tensioned concrete bottom chord.