Tractor Mounted Ripper Construction Engineering Finance Assignment Help

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1. Trial blasting operations indicate that a rectangular pattern with holes 24 ft (6.4 m) deep spaced on 1O-ft (3.05-m) centers will yield a satisfactory rock break with an effective depth of 219 ft (5.8 m). Determine the rock volume produced per foot (meter) of drilling.
 
2. A tractor-mounted ripper will be used for excavating a limestone having a seismic velocity of 6000 ft/s (1830 m/s). Field tests indicate that the ripper can obtain satisfactory rock fracturing to a depth of 2 ft (0.61 m) with one pass of a single ripper shank at 3-ft (0.91-m) intervals. Average ripping speed for each 400-ft (122-m) pass is 1.5 mi/h (2.4 km/h). Maneuver and tum time at the end of each pass averages 0.3 min. Job efficiency is estimated at 0.70. Machine cost, including the operator, is $130/h. Estimate the hourly production and unit cost of excavation
 
3. Twelve miles (19.2 km) of gravel road require reshaping and leveling. You estimate that a motor grader will require two passes at 3 mi/h (4.8 km/h), two passes at 4 mi/h (6.4 km/h), and one pass at 5 mi/h (8.0 km/b) to accomplish the work. How many grader hours will be required for this work if the job efficiency factor is 0.83?
 

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4. List the types of compactors that are available for compaction in confined areas.
 
5. A highway contractor has opened a cut in a fine silty sand (SM). Because of the cut location and lack of drainage, surface water has drained into the cut, leaving the material very wet. Rubber-tired scrapers are hauling material from the cut to an adjacent fill. The material is being placed in the fill in 8- to 10-in. (20- to 25-cm) lifts and compacted by a heavy shcepsfoot roller towed by a crawler tractor. It is apparent that the specified compaction (95% of standard AASHTO density) is not being attained. The sheeps foot roller is not “walking out,” and the scraper tires am causing deep rutting and displacement of the fill material as they travel over it. What is causing the compaction problem? What would you suggest to the constructor to improve the compaction process?

 

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