Evaluate cost and production using a 3-cy hoe to load wet gravel into 14-cy-size trucks. Assume a bucket fill factor of 105% and that the hoe bucket swing cycle time is 24 sec. Use the information in table below, a truck net empty weight of 36,860 lb, and a rated payload of 40,000 lb. Dump time will be 1.3 min. The haul distance is 2.5 miles from the pit to the plant up a 3% grade. The rolling resistance of the haul road will be maintained at 3%. The hoe and operator cost $97 per hour, and trucks cost $49 per hour. Assume the efficiency is 60min/hr. 1- What is the truck cycle time? 2- What is the loader cycle time? 3- What is the number of trucks? 4- What is the production of the truck, if you know that the loader will control that production? 5- What is the total cost in dollars $ and in ($/lcy)? Total Speed(mph) resistance% 35 2 35 4 22.5 12.5 8 7
Evaluate cost and production using a 3-cy hoe to load wet gravel into 14-cy-size trucks. Assume a bucket fill factor of 105% and that the hoe bucket swing cycle time is 24 sec. Use the information in table below, a truck net empty weight of 36,860 lb, and a rated payload of 40,000 lb. Dump time will be 1.3 min. The haul distance is 2.5 miles from the pit to the plant up a 3% grade. The rolling resistance of the haul road will be maintained at 3%. The hoe and operator cost $97 per hour, and trucks cost $49 per hour. Assume the efficiency is 60min/hr. 1- What is the truck cycle time? 2- What is the loader cycle time? 3- What is the number of trucks? 4- What is the production of the truck, if you know that the loader will control that production? 5- What is the total cost in dollars $ and in ($/lcy)? Total Speed(mph) resistance% 35 2 35 4 22.5 12.5 8 7
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Evaluate cost and production using a 3-cy hoe to load wet gravel into
14-cy-size trucks. Assume a bucket fill factor of 105% and that the hoe
bucket swing cycle time is 24 sec. Use the information in table below, a
truck net empty weight of 36,860 lb, and a rated payload of 40,000 lb.
Dump time will be 1.3 min. The haul distance is 2.5 miles from the pit to
the plant up a 3% grade. The rolling resistance of the haul road will be
maintained at 3%. The hoe and operator cost $97 per hour, and trucks
cost $49 per hour. Assume the efficiency is 60min/hr.
1- What is the truck cycle time?
2- What is the loader cycle time?
3- What is the number of trucks?
4- What is the production of the truck, if you know that the loader
will control that production?
5- What is the total cost in dollars $ and in ($/Įcy)?
Total
Speed(mph)
resistance%
35
2
35
4
22.5
12.5
8
7
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