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Features of tunneling in St. Paul and Minneapolis, Minn; normal stratigraphic sequence from surface down is -- glacial drift (mixed silts, sands, clays, shales and boulders), Platteville Limestone, Glenwood Shale and St. Peter Sandstone; procedure in advancing tunnel was to direct h-p water at face to erode sandstone into sand slurry; mining water was obtained from dewatering wells and carried to machine in 8 in. pipe, passed through jet pumps, and directed at face through 1/4-in. diam nozzles mounted on hand lances; cutting pressure developed at pump was 400 psi; for tunnel lining modified type 3 grade Y concrete is used by concrete pumping machine; overall footage normally averages from 30 to 50 ft in 8-hr shift.
Features of tunneling in St. Paul and Minneapolis, Minn; normal stratigraphic sequence from surface down is -- glacial drift (mixed silts, sands, clays, shales and boulders), Platteville Limestone, Glenwood Shale and St. Peter Sandstone; procedure in advancing tunnel was to direct h-p water at face to erode sandstone into sand slurry; mining water was obtained from dewatering wells and carried to machine in 8 in. pipe, passed through jet pumps, and directed at face through 1/4-in. diam nozzles mounted on hand lances; cutting pressure developed at pump was 400 psi; for tunnel lining modified type 3 grade Y concrete is used by concrete pumping machine; overall footage normally averages from 30 to 50 ft in 8-hr shift.
Storm sewer tunneling in sandstone
Pub Works
McRae, K.K. (author)
Public Works ; 98
1967
2 pages
Article (Journal)
English
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Unusual tunneling machine cuts and lines storm sewer
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