Quiz #3 2
Terms
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- What document is required to be with a crane?
- load rating chart
- What is the lay length?
- Length for 1 strand to make a full rotation around wire rope.
- What are major causes of accidents with cranes?
-
-Contact with power lines
-Overturns
-Falls
-Mechanical Failures - How do accidents with cranes occur?
-
-Instability
-Lack of Communication
-Lack of Training
-Inadequate maintenance - What are some types of cranes?
- Mobile, Hydraulic, Overhead, Tower
- Crane operators must do what two things?
- Must qualify on specific crane type and must include on-the-job training
- How much does soil weigh?
-
3000 lbs/yd
100 lbs/ft - What causes cave ins?
- Vibration, Freezing and thawing, weight of soil, etc.
- Most trenching accidents occur at what level?
- 5 feet to 15 feet
- Soil type compressive strengths
-
A - > 1.5 tons/sf
B - .05 - 1.5 tons/sf
C - <.05 tons/sf - What is the name of the pyramid used to classify soils?
- USDA Textural soils classification system
- What is a sedimentary test?
- Test that breaks down makeup of the dirt (clay, silt, sand)
- Trenching more than __ feet require shoring
- 5 feet
- What are the excavation and trenching maximum allowable slopes for different soil types?
-
Type A - 3/4 to 1
Type B - 1 to 1
Type C - 1 1/2 to 1 - When a trench is __ feet in depth and length, a safe means of exit must be provided
- 4 feet
- Trench box extends at least __ inches over walls of excavation
- 18 inches
- A horizontal lattere must extend ___ feet past the top of the excavation
- 3 feet
- Temporary spoil piles must be kept _ feet from the edge of the excavation
- 2 feet
- Excavation bridge minimum widith is ____ and must extend passes trench sides by ____ .
- 20 inches , 2 feet