Use of Hydrauger machine to drill holes for steel-pipe conduit through railroad embankment of Pennsylvania railroad line in New Jersey; 77-ft bore is drilled under four-main-line railroad tracks and 3-in. pipe conduit is installed in 6 working hours without disturbing tracks or slowing train operation.
Hydraulic boring machine
Construction Methods
Construction Methods ; 15 , n 6
1933
3 pages
Aufsatz (Zeitschrift)
Englisch
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