Question

Part 2 Based upon the results to part 1, the project requires hauling materials to, or from, the site. The following equipment is available for earthwork operations: - One 5-cy heaped capacity bucket loader; a 0.5 min cycle time; 90% fill capacity. - One 7-cy heaped capacity bucket loader; a 0.6 min cycle time; 90% fill capacity. 45.9-cy heaped capacity off-road trucks; a 0.5 min dump time; 100% fill capacity. - Loaded trucks travel through the following three sections: Haul Route Section Distance (ft) Grade (%) Speed Loaded (mph) Speed Empty (mph) 42 1 10 2750 700 1800 7 10 2 7 42 3 8 8 42 a. Calculate the following: - Number of cycles per loader to fill each truck. - Number of trucks required for each loader. Based on the number of trucks you determine, develop a curve for the $/cy production cost vs. trucks for a range of +/- 2 trucks. Use the following hourly rates (including operator) for each piece of equipment: - 5-cy capacity loader $105.00/hr - 7-cy capacity loader $110.00/hr - 45.9-cy off-road truck $120.00 b. Determine the total time required to import/export the required materials from Part 1.

Answer 1

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W* DATE: 1) No. of cycles to fill tood truch o 5-cy loader, 0.5 min cycle 4 gol fill capecity actual volume a 0.945cy 4.5 cy /0.5m g cy (min No. of cycles required = 45.9 cycles "I cyclen 4.5 0.6 mir ii) 7cy. Loader, cycle, gol fill capacity. actull vol. 0.947 Ey '= 6.3 cy. No. of cycles required 8 cycles 6.3 45.9 cycles 2 i) Total Cycle time time required to fill trucka of truck 11X0.5 mins. = 5.5 mins 1800 2750+700 + 180 11.733 61.6 f 2750 + You 14.67 16201 + Cycle time of truck 494.317 sec 8.2886 ming. No of duck required = ( 8 258 +1 = 3 trucks

DATE: ii) a Total time to fill a truck= No. of trucks required 8x6.6 mins- 4.8 mins 3 trucks In both caser 3 trucks required, 45.9 3) If I bruck used Total cost for 5 cy Loader = 60 X egoence Ly $.5+ 8-2386 Total 200.46 cy. cost / hor= $(los +120) = $920 $225/200.46 $1.122 | cy. Similary for 2 trucks, cost = $0.86 / cy. for '3 trucks, $0.93 /ey. cost 1.122 Por 5cy loaded. 0.93 0.86 Alo of truch

DATE: ii) for 7 cy bader for truckt Loader, & cast = $ 11088 for 2 bruck & Loader, cost : $ 0.83 for 3 truck & londer, cost . $0.819 = sley odig 2 3 No. of trucks b Total time required (cycle. londer 5.5 min for 7 loader Per druck- 8.7886 mins 4.8 min