Using the following performance chart and information about an earthmoving opera
ID: 1885695 • Letter: U
Question
Using the following performance chart and information about an earthmoving operation, calculate the cost and time needed to process 10,000 m3 of soil material. The process includes: a) a bulldozer strips and pushes soil material for average distance of 75 meters and stockpiles for an excavator, b) the excavator loads the material into dump trucks, c) dump trucks haul material in public roads and empty the material in the designated dump area Bulldozer type: D7G Bulldozer operator: average level skill Bulldozer operation cost: 250 S/hr Excavator cycle time for each bucket: 20 seconds Excavator bucket capacity: 2 m5 Excavator bucket fill factor: 0.9 m3 Excavator operation cost: 200 $/hr Truck struck capacity: 9 m3 Truck heaped capacity: 10 m3 Truck operation cost: 100 $/hr Haul time: fully loaded 14 min, less than fully loaded 12 minutes; Return time: 9 min Dump time: 1 minute Number of dozers: 1 Number of excavator:1 Number of dump trucks: you need to determine Efficiency of the bulldozer 50 min/hr Efficiency of the excavator and trucks 55 min/hr 3Explanation / Answer
No. Of dump trucks = Total volume ÷ volume of truck
= 1000 ÷ 10 = 1000
Increase by 5%
1000 X 1.05 = 1050 (no of dumps required)
Take hauling time = 13 minutes
Return period = 9 minutes and dump time is 1 minute
Total time = 23 minutes
Total no of trucks = 55÷23=2.39
Therefore use 3 trucks
23 X 1050÷3 = 8050 minutes
Total time is 8050÷60 = 134.2 hrs ~ 135 hrs
Truck operation cost = 135 X 100 = 13500 $
EXCAVATOR
capacity of bucket = 2×0.9=1.8 m3
Cost = 135×55÷60×200= 24750 $
Bulldozer
Cost = 135×50÷60×250 = 28125 $
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