Actions for Big-hole drilling - the state of the art [electronic resource].

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Big-hole drilling - the state of the art [electronic resource].

Published
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1983.
Physical Description
Pages: 11 : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The art of big-hole drilling has been in a continual state of evolution at the Nevada Test Site since the start of underground testing in 1961. Emplacement holes for nuclear devices are still being drilled by the rotary-drilling process, but almost all the hardware and systems have undergone many changes during the intervening years. The current design of bits, cutters, and other big-hole-drilling hardware results from contributions of manufacturers and Test Site personnel. The dual-string, air-lift, reverse-circulation system was developed at the Test Site. Necessity was really the Mother of this invention, but this circulation system is worthy of consideration under almost any condition. Drill rigs for big-hole drilling are usually adaptations of large oil-well drill rigs with minor modifications required to handle the big bits and drilling assemblies. Steel remains the favorite shaft lining material, but a lot of thought is being given to concrete linings, especially precast concrete.
Report Numbers
E 1.99:conf-830611-1
conf-830611-1
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1983.
"conf-830611-1"
"DE83007538"
Rapid excavation and tunneling conference, Chicago, IL, USA, 12 Jun 1983.
Lackey, M.D.
Reynolds Electrical and Engineering Co., Inc., Las Vegas, NV (USA)
Funding Information
AC08-76NV00410
View MARC record | catkey: 14118166