Enrol to start learning
Reading is open to everyone. Enrolling is free, and it is what unlocks the audio lessons, practice tests and progress tracking.
9. Earth Moving Equipment-Scrapers (Part-2)
The lecture discusses the operational aspects of scrapers in civil engineering, focusing on productivity estimation and balancing the number of scrapers and pushers. It explains key concepts such as swell factor, machine weight, and resistance encountered during operations. The necessity of optimizing operations to improve productivity and reduce production costs is emphasized.
Sections
This section elaborates on the productivity estimation of scrapers, cycle time calculations, and the interplay between scrapers and pushers in construction operations.
This section introduces and explores the fundamental concepts and operations involved in earth-moving equipment, specifically scrapers and pushers.
This section focuses on the estimation of productivity for scrapers, including calculations involving material properties, machine capacities, and operational efficiencies.
This section examines the haul route characteristics and the resistance encountered by scrapers and pushers in construction operations.
This section covers cycle time calculations related to scrapers in earth moving operations, including productivity estimation and balancing machinery.
This section explains the significance of balancing scraper and pusher operations to optimize productivity in earth-moving operations.
The swell factor increases by 10% for push-loaded scrapers due to additional pressure from the pusher.
It's crucial to check the load of the scraper against its safe operating weight to prevent machine abuse.
Balancing the number of scrapers and pushers can minimize waiting time and enhance overall productivity.
Swell Factor
The ratio of loose dry unit weight of material to bank dry unit weight, which indicates how much a material expands when disturbed.
Gross Weight
The total weight of the machine including its empty weight plus the weight of the load it carries.
Resistance
The total force opposing the movement of the scraper, including rolling and grade resistance, which affects its operational efficiency.
Cycle Time
The total time for a machine to complete one full cycle of operation, including loading, hauling, and unloading.
Practice Exercises
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting
Get your answers marked and your progress tracked
Enrol free