United States Department of Transportation
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Drilling and Preparation of Reusable, Long Range, Horizontal Bore Holes in Rock and in Gouge.: Vol. II.: Estimating Manual for Time and Cost Requirements
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1975-10-01
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[PDF-1.89 MB]
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Edition:Final Report
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Abstract:The objective of this study is to assess horizontal drilling as an alternative to pilot tunneling in geological investigation prior to the design and construction of highway tunnels and to identify means to increase the penetration capability and accuracy and decrease the cost of horizontal drilling. This volume presents a model for estimating the time and cost of drilling long horizontal holes. Sample problems are worked in detail to illustrate the application of the model to four (4) different drilling techniques. Procedures to apply the model to any combination of geological conditions are illustrated with an example problem. The logic and format of the model are adaptable to future improvements in the state-of-the-art of horizontal drilling. This is the second of three volumes. Volume I is published as FHWA-RD-7s-95, subtitle: A State-of-the-Art Assessment. Volume III is published as FHWA-RD-7s-97, Subtitle: A Development Plan to Extend Penetration Capability, Increase Accuracy and Reduce Costs.
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