Final Report, Contract F08606-79-C-0023.
Abstract
This report describes the work to purchase, improve the transportability and evaluate a lightweight air percussion drill rig for use in preparing 50-foot deep (15 meter) boreholes cased with 4.5 inch O. D. casing. The drilling rig was purchased from a foreign manufacturer and modified to incorporate dual purpose carrying handle and wheel axle stubs on the major rig components. Other components and modifications to improve transportability and field performance were also purchased or fabricated. A preliminary evaluation of the equipment at the Teledyne Geotech plant showed that air percussion drilling could not be used in either soft geological formations or where there is subterranean water present. A subsequent field evaluation showed that the equipment was entirely satisfactory for use in hard geological formations and met or exceeded all specified requirements during these tests. A test borehole was completed to 85-feet (25 meters) with an average penetration rate of six to eight inches-per-minute. Three major problems encountered during the field tests were subsequently corrected. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 1979
- Accession Number
- ADA081655
Entities
People
- W. D. Ballard
Organizations
- Teledyne Technologies