Question

7.7 A contractor wants to explore using a 7U blade on a 240 hp dozer. The material is a dry, noncohesive silty sand and must be moved a distance of 200 ft from the beginning of the cut. It is estimated the material will swell 4%, from bank to loose state. Both visibility and traction should be satisfactory. Job efficiency is assumed to be equivalent to a 50-min hour. The U-blade width is 13 ft 1 in with 3.25 ft of wing width, and a height of 5 ft 1.1 in The wing angle is 28.0 deg. Assume an average push speed of 3 mph and a return speed of 4 mph. Calculate the direct cost of the proposed earthmoving operation in dollars per bcy. Assume that the O&O cost for the dozer is $89.50 per hour and the operator's wage is $19.00 per hour plus 30% for fringes and worker's compensation. (S0.225/bcy)

Answer 1

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