5. Cycle Time of the Bulldozer
The chapter provides a comprehensive insight into the operational dynamics of bulldozers, particularly focusing on cycle time estimation, productivity assessment, and the impact of various operational factors such as haul distance, speed, and transmission types. It elaborates on how to use performance charts for speed determination and introduces several methods for estimating productivity, including the use of production curves and thumb rules. This foundation offers a vital understanding necessary for effective cost estimation in earthmoving operations.
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What we have learnt
- The cycle time of a bulldozer is comprised of push time, return time, and maneuver time.
- Productivity can be estimated through several methods including performance charts, production curves, and thumb rules.
- Job efficiency is a crucial factor that influences the effective operational time of bulldozers, impacting productivity and cost estimates.
Key Concepts
- -- Cycle Time
- The total time taken for completing one full operation cycle of a bulldozer, including push time, return time, and maneuver time.
- -- Push Time
- The time required for a bulldozer to push material from the cutting point to the dumping location, which varies depending on haul distance.
- -- Productivity
- The volume of material moved by the bulldozer over a defined time period, typically expressed in loose cubic meters per hour.
- -- Job Efficiency
- The percentage of time that the bulldozer is actively working compared to the total time allocated for the operation.
- -- Transmission Type
- Types of gear change in the bulldozer, which affect the maneuver time and overall cycle time; can be manual or automatic.
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