Design-build contractor GeoStructures completed the foundation reinforcement of Pennsylvania’s historic Kinzua Bridge. Tension micropiles were required in order to add supplemental lateral load resistance for the remaining sections of the former railroad bridge that was partially destroyed by a tornado in 2003. The micropiles, which anchor the existing tower piers into rock, were installed through the existing sandstone tower pier foundations. GeoStructures installed a total of 48 primary tension micropiles with load capacities ranging from 54 to 84 kips to provide additional foundation uplift restance and 48 secondary anchors to reinforce the existing tower piers.
A case history on the project was presented at the International Society for Micropiles – International Workshop on Micropiles in Washington, DC. The case history presentation can be viewed HERE.