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Questions and Answers
Assuming 8-hr workdays, the number of days required to complete the excavation job with a 2.8 yd³ bucket capacity is most nearly:
Assuming 8-hr workdays, the number of days required to complete the excavation job with a 2.8 yd³ bucket capacity is most nearly:
The number of trucks needed to balance the production of an excavator with a bucket capacity of 3.0 yd³ is most nearly:
The number of trucks needed to balance the production of an excavator with a bucket capacity of 3.0 yd³ is most nearly:
The complete cost ($) of the change order for the revised SOW for the warehouse building is most nearly:
The complete cost ($) of the change order for the revised SOW for the warehouse building is most nearly:
The total material cost ($) for lining a canal with concrete is most nearly:
The total material cost ($) for lining a canal with concrete is most nearly:
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The number of dump trucks needed to haul excavated material from a site is most nearly:
The number of dump trucks needed to haul excavated material from a site is most nearly:
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The project duration (weeks) for the summarized project activities is most nearly:
The project duration (weeks) for the summarized project activities is most nearly:
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What is the swell percentage of the material to be excavated?
What is the swell percentage of the material to be excavated?
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What is the in situ unit weight of the excavated material?
What is the in situ unit weight of the excavated material?
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What is the stated truck capacity for transporting the excavated material?
What is the stated truck capacity for transporting the excavated material?
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Study Notes
Excavator Operation Cycle
- Bucket Capacity: 2.8 yd³ (or 3.0 yd³)
- Phases (Example): Excavation, travel (two-way), dumping/transfer
- Excavation Time: 45 seconds
- Travel Time (Two-way): 4 minutes
- Transfer/Dumping Time: 30 seconds (or 45 seconds)
- Overall Efficiency: 85% (or 90%)
- Material to be Excavated: 50,000 ft³ (or 2,600 yd³ loose)
- Material Properties (Example): Swell = 20%, In situ unit weight = 120 lb/ft³, Water content = 30%
- Workday: 8 hours
Number of Days Required
- Calculation: Determined by the excavator's cycle time and efficiency, and the total material volume to be excavated.
- Example Answers: A. 9, B. 10, C. 11, D. 13 (depending on the details)
Truck Capacity and Operational Data
- Truck Capacity: 15 yd³
- Truck Cycle Time: 90 minutes
- Other Data: Overall efficiency factor, excavator output, excavated material, etc.
Warehouse Building Design Change
- Revised Design: Replacing one layer of sheetrock with two layers of fire-code GWB and insulation.
- Dimensions: 180 ft × 200 ft, 12 ft floor-to-ceiling height, 8 openings (6ft wide x 10ft high)
- Labor: Carpenter foreman ($50.00), Carpenter ($40.00), Laborer ($25.00)
- Work Crew: 4 carpenters, 2 laborers, 1 foreman
- Work Crew Productivity: GWB installation 960 ft²/L.H., Insulation 1,920 ft²/L.H.
Material Costs
- GWB Costs: 4 ft x 10 ft x 1½ in. GWB ($0.285/ft²), 4 ft x 10 ft x 5/8 in. GWB ($0.255/ft²)
- Insulation Costs: $0.45/ft²
- Waste Factor: 10%
- Contractor Overhead/Profit: 10% and 5%, respectively
- Total Cost: Approximately $3,300,4,200,9,800,7,800 (depending on calculations)
Additional Factors
- Dump Truck Productivity: 0.80 for equipment idle time and 0.70 for operator efficiency are factors that need to be considered.
- Number of Trucks Needed: Calculated from excavator output, truck capacity, travel time and job location.
- Project Duration (weeks): 32, 36, 41, or 44
- Total Material Cost: ~ $75,000, $85,000, $95,000 or $105,000
- Concrete Costs: $98/yd³, 8 in. Nominal thickness, 8 yd³/hour pour rate, 300 ft²/gal coverage
- Canal LIning Materials: Includes concrete, pour rate, surfacing compound.
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Description
Test your knowledge on the operation cycle of excavators, including phases like excavation, travel, and dumping. This quiz covers calculations related to bucket capacity, material excavation requirements, and truck cycle times. Perfect for engineering students and professionals in construction.
