Minnesota – The historic bridge carrying Franklin Avenue over the Mississippi River is getting a makeover in an innovative way meant to lessen construction time. “Pouring concrete on the bridge, according to Paul Backer, a county project engineer would have closed the bridge for two construction seasons.”
Instead, contractor Kraemer North America has been precasting 366 panels of the new concrete bridge deck just upstream at Bohemian Flats. From there, they’ll be barged to the bridge and hoisted to the deck by cranes. The cranes are also being used to lower 25-ton sections of the old 1970s bridge deck to barges below, to be ferried upriver and trucked to a crushing yard.
The 45 cross beams of reinforced concrete that support the deck will also be exchanged. The newly cast beams will feature scrolled ends that mimic the bridge’s original 1923 design. New side railings in the original design also will be installed, along with reproductions of the original ornamental streetlights.