A project in medium silica, coarse-grain sandstone is being investigated. Field drilling tests proved that air-track drills with 31/2 -in. B bits can achive a penetratin rate of 2 ft/min. Asume that it takes 5 min to change a bit. The drills use 12-ft steel. The blasting pattern will be 10 x 10 ft with 2 ft of subdrilling. The average depth to finish grade is 18 ft. Assume a 45-min production hour drilling. Determine 1. Drilling time -- mins 2. Total time ... min . 3. Estimate the hourly production (ft/hr):
A project in medium silica, coarse-grain sandstone is being investigated. Field drilling tests proved that air-track drills with 31/2 -in. B bits can achive a penetratin rate of 2 ft/min. Asume that it takes 5 min to change a bit. The drills use 12-ft steel. The blasting pattern will be 10 x 10 ft with 2 ft of subdrilling. The average depth to finish grade is 18 ft. Assume a 45-min production hour drilling. Determine 1. Drilling time -- mins 2. Total time ... min . 3. Estimate the hourly production (ft/hr):
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A project in medium silica, coarse-grain sandstone is being investigated. Field drilling tests proved that air-track drills with 31/2 -in. B bits can achive a penetratin rate of 2 ft/min. Asume that it takes 5 min to change a bit. The drills use 12-ft steel. The blasting pattern will be 10 x 10 ft with 2 ft of subdrilling. The average depth to finish grade is 18 ft. Assume a 45-min production hour drilling. Determine 1. Drilling time -- mins 2. Total time ... min . 3. Estimate the hourly production (ft/hr):
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