Work to begin lifting the sagging portions of the Leo Frigo Memorial Bridge on I-43 in Green Bay, Wisconsin is scheduled to begin Tuesday. According to the Green Bay Press Gazette, Zenith Tech Inc. is working on the repairs. It will be a BIG lift, indeed…..
Raising the troubled Leo Frigo Memorial Bridge back into place will be a task equivalent to hoisting an entire fleet of 747s into the air.
Experts have calculated that the sagging section of Green Bay’s distressed bridge weighs more than 3 million pounds, or about 1,600 tons.
Zenith Tech crews are expected to spend several days using hydraulic jacks to boost the Leo Frigo back into position — a process that will go slow, by design.
Starting with the northbound lanes, Zenith Tech will insert 10 hydraulic jacks beneath the bridge deck and operate them all simultaneously to raise the platform. Each jack will be exerting enough pressure to support 183,000 pounds, although Dreher said their capacity is 50 percent greater than that — just in case it is needed.
Dreher said the jacks will be calibrated carefully to operate in perfect unison, so there is no risk of the bridge deck leaning one way or the other as it is elevated.
“You can’t just go in there and start jacking away,” he said. “It definitely takes some coordination and good communication.
A very challenging and interesting repair project. Kudos to the Wisconsin DOT and all involved in getting the repairs done quickly.
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