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10 Cards in this Set
- Front
- Back
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What is the best way to maximize return on investment when dealing equipment selection |
Equipment must be evaluated on CPP (cost per unit of production) -this is the amount of time it takes to complete the work relative to the cost of renting, operating, and maintaining the equipment for that period of time. |
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what is equipment's production capability based on? |
equipment's production capability is based on how quickly the work is completed. |
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cycle time |
the amount of time that passes between the beginning of the action the equipment performs and the beginning of the next repetition of the action. Ways to estimate cycle time: Cycle Time = (effective working minutes) / (hour overall) Cycle Time = (theoretical number of cycles per hour) * (numerical efficiency) |
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Excavation and Loading Equipment (use) (types of equipment) |
used to excavate material for large earthwork cuts, to install underground utilities, to construct foundations etc [backhoes:digging bucket on articulated arm on back of tractor or loader][excavator: for below level, confined locations, small cranes, pipes, and trenches][dragline: bucket with ropes][dozer:versatile for clearing, grubbing, shallow excavation, pushing scrappers, spreading, ripping][loader:fixed position excavator, transporter of material over short distances] |
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Excavation and Loading Equipment (capacity, and general production capability) |
Struck Capacity- capacity when filled to rim. Heaped Capacity-capacity when material is mounded above the rim at a slope of 2:1. Load Capacity measured in in (LCY) Loose Cubic Yards [assumed to be heaped] -----Production capacity is based on how much material can it move[loaded in an hour. Depend on cycle time and fill factor |
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Excavation and Loading Equipment: Backhoe (cycle time, fill factor, production capacity) |
Cycle Time: time for loading the bucket, swinging the load over the haul equipment, dumping the load, and returning bucket to the excavation position. Fill Factor: (actual loose volume of material being moved) / (heaped capacity of bucket) Production Capacity: How much loose cubic yards of material per hour |
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Excavation and Loading Equipment: Exacavator (cycle time, fill factor, production capacity) |
Production Capacity: How much loose cubic yards of material per hour Cycle Time: time for loading the bucket, swinging the load over the haul equipment, dumping the load, and returning bucket to the excavation position. Fill Factor: (actual loose volume of material being moved) / (heaped capacity of bucket) |
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Excavation and Loading Equipment: Dozer(cycle time, fill factor, production capacity) |
Production Capacity: How much loose cubic yards of material per hour Cycle Time: time it takes to maneuver the dozer into position, move the load, returning the dozer to loads, Depends on blade capacity volume[=V*0.375] Fill Factor: (actual loose volume of material being moved) / (heaped capacity of bucket) |
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Excavation and Loading Equipment: Loaders(cycle time, fill factor, production capacity) |
Cycle Time: time it takes to load the bucket, position the loader, travel to fill location, return to the borrow. Production Capacity: How much loose cubic yards of material per hour Fill Factor: (actual loose volume of material being moved) / (heaped capacity of bucket) [depending materials, used backhoes and excavators] |
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Consulting Engineer |
-Hired by owner (no contractual obligation to GC or subcontractors) -develop the design and contract documents -observe construction project -review contractor's payment requests -processing of contract change orders |
