Utility Shafts
Four large utility shafts from 12 to 18 feet in diameter were installed as part of a 12,000 storm sewer tunnel in the St. Peter Sandstone formation 150 feet below grade for the city of St. Paul. Shown here is a 17½ dia. core barrel used to cut the Platteville Limestone. Note that two Watson 5000 crane-attached drills are stacked one above the other to furnish the required drilling torque.
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