Shovel truck combo with answer - Cstm 456

Shovel truck combo with answer - Cstm 456 - Review Question...

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Review Question Using the haul road profile found below and the following information answer the ensuing questions. The equipment that you will be using for excavation is one CAT 5130B bottom dump shovel with a heaped bucket capacity of 14.5 cubic yards. The soil being excavated is decomposed rock, 75 % rock and 25 % earth. The soil is rock-earth mix having a fill factor of 100%. The loading of the trucks will be at 90 degrees to the shovel. Your average depth of cut is 14’ - 8 “and the maximum effective cutting reach up the face is 30’-0”. The shovel will be operating on 50-minute hours and the trucks at 55 minute. The trucks that you will be using are CAT 777D flat floor dual slope with 27.00-R49 tires. The cycle time to turn and dump the load is .35 minutes. A. How many bank cubic yards are in one truck load? 10 points B. How long in minutes is each round trip for one truck? 15 points C How many trucks are needed? (Keep answer to two decimal places.) 30 points D What is the efficiency of the shovel/truck combination if the shovel is idle? 10 points E. What is the efficiency of the shovel/truck combination if the trucks are idle? 10 points F. If you are moving 234,967 bank cubic yards of soil, working eight-hour days, how many days and hours will it take to move that many cubic yards? 20 points Show all your work in a neat, orderly fashion. Work which is deemed not neat and orderly by the order of the very neat patrol (that’s me), will have 30 to 50 % deducted from your score. Use the attached charts. Place your number on backside of last sheet. Failure to place your number on the backside of the last sheet will be the score of zero. Pit Dump r.r.f.= 60lb./tn. 2,389 ft. r.r.f.= 80 lb./tn. 3,782 ft. r.r.f.= 40 lb./tn. 2,871 ft. 5 % grade Acc.= .35 min. Acc. = .20 min. Dec. = .28min. Acc. = .45 min. Dec. = .15 min.
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Given: CAT 5130B bottom dump shovel 14.5 cubic yards Start loading time .42 min. (from chart –given) Fill Factor 100% Soil decomposed rock, 75 % rock and 25 % earth LF.70 Loading 777 D CAT flat floo r dual slope trucks at 90 degrees Average depth of cut 14’-8” Max. effective cut 30’-0” Shovel working 50 min./hrs Trucks 55 min./hrs Cycle time to dump load .35 min. See haul road profile
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Shovel truck combo with answer - Cstm 456 - Review Question...

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