POLAR CONSTRUCTION EQUIPMENT - INVESTIGATION OF DRILLING EQUIPMENT.
Interim technical note Jan 65-Feb 67,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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The drilling of holes in snow, ice and permafrost is important in polar operations but presents problems not generally encountered in normal earth and rock drilling. Holes are required both for determining the nature of the subsurface and for placing utility poles, piling and other structural elements. This technical note presents the results of preliminary tests being conducted to improve drilling methods and techniques, and describes a rotary-type drill with 12-foot folding tower being used in this work. Results of these tests indicate that additional work is required for improving methods of drilling both deep holes and large-diameter holes in snow, ice and permanently frozen ground. Future work will include evaluation of a tri-cone roller rock bit and a 14-inch pipe drill with tungsten-carbide hardfaced cutting edge. Author
- Machinery and Tools