Stripping overburden in the Illinois coal belt, the DustyCoal Company uses 270-horsepower, track-type tractors(with direct-drive transmissions) and drawn scrapers. Theoverburden is a very soft loam that weighs 2,800 lb/yd(loose). Estimated RR factor for the haul road is 300 lb/ton.If the scraper weighs 35,000 lb (empty) and carries 25 loosecubic yards per trip, what is the RR of the loaded unit?What operating gear and speed do you estimate for theloaded machines on level ground?
Stripping overburden in the Illinois coal belt, the DustyCoal Company uses 270-horsepower, track-type tractors(with direct-drive transmissions) and drawn scrapers. Theoverburden is a very soft loam that weighs 2,800 lb/yd(loose). Estimated RR factor for the haul road is 300 lb/ton.If the scraper weighs 35,000 lb (empty) and carries 25 loosecubic yards per trip, what is the RR of the loaded unit?What operating gear and speed do you estimate for theloaded machines on level ground?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Stripping overburden in the Illinois coal belt, the Dusty
Coal Company uses 270-horsepower, track-type tractors
(with direct-drive transmissions) and drawn scrapers. The
overburden is a very soft loam that weighs 2,800 lb/yd
(loose). Estimated RR factor for the haul road is 300 lb/ton.
If the scraper weighs 35,000 lb (empty) and carries 25 loose
cubic yards per trip, what is the RR of the loaded unit?
What operating gear and speed do you estimate for the
loaded machines on level ground?
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