Secant Walls
In Oklahoma the ____________ River was threatening to under this river crossing tower. Tri-State was contracted to construct a 100-foot diameter circle of 36-inch piers around the tower. Piers were constructed tightly together to form a wall. They were drilled through 20 feet of drift and were socketted firmly into 3 feet of limestone. If the river continues to change course the tower will be sitting on a man-made island surrounded by a castle of piers.
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