Precision is key to alignment of shells in Ohio River lock and dam job

11/14/2011 | Engineering News-Record

Work is proceeding on the $2.1 billion Olmsted Locks and Dam replacement in the Ohio River between Illinois and Kentucky. Huge strand jacks are placing the dam's dozen tainter-gate foundation shells, six pier shells that hold the gates and a dozen navigable-pass foundation shells. The shells are placed within a 1-inch tolerance on piles 60 feet underwater, lowered from the world's biggest catamaran barge -- an operation made more challenging by swift currents and a soft riverbed.

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