A Demonstration of an Alternate Approach to Kelly Bar Loading.
NTIS: PB 283 392 Available for Reference At Bureau Libraries :58 pages
A program was conducted to determine the feasibility of providing a borehole liner for kelly bar drilled boreholes in southern Florida. The concept was to drill the borehole with the kelly bar and with it still in the borehole insert a tube that would remain in the unstable ground after withdrawal of the bar. The tube then will provide an unobstructed borehole for the charging of explosives upon completion of the drilling of the shot pattern.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 283 392 Available for Reference At Bureau Libraries