What are the most common types of crane accidents quizlet?
OSHA has identified the major causes of crane accidents to be boom or crane contact with energized power lines (nearly 45% of the cases); overturned cranes; dropped loads; boom collapse; crushing by the counter weight; outrigger use; falls; and rigging failures.
Which of the following is the most dangerous factor among crane accidents?
Contact with overhead power lines – Electrocution from contact with overhead power lines is a leading cause of crane related accidents. Both the crane operator and workers in the crane basket should be aware of the placement of power lines surrounding the worksite.
What are the four basic lifting principles that govern a Cranes mobility and safety?
The four basic lifting principles that govern a crane’s mobility and safety during lifting operations are leverage, structural integrity, stability, and center of gravity.
Which of the following must the operator take into consideration when determining the load rating?
An operator must take wind conditions into consideration when determining the load rating of a crane.
What are the most common types of crane accidents?
OSHA’s analysis of crane accidents identified the major causes of crane accidents as:
- boom or crane contact with energized power lines (nearly 45% of the cases)
- under the hook lifting device.
- overturned cranes.
- dropped loads.
- boom collapse.
- crushing by the counter weight.
- outrigger use, falls and rigging failures.
What must be done before operating a crane?
Make sure the crane is suitable to lift and travel the load. … Visually inspect the crane before use. Make sure all loose materials, parts, blocking and packing have been removed from the load before lifting. Remove any slack from the sling and hoisting ropes before lifting the load.
What are the four main causes of crane accidents?
The main four causes of crane accidents are contact with power lines, overturns, falls, and mechanical failure.
How can we prevent crane accidents?
Make sure the crane is not carrying a load which is more than its capacity. Under US standards for mobile cranes, the load should not be more than 75 percent of the tipping weight. 6. Install fences around the construction site to prevent outsiders from going near the crane.
What is the world’s largest crane?
The Liebherr LTM 11200-9.1, built by the German company Liebherr Group, is the most powerful mobile crane ever built. It also has the longest telescopic boom in the world, which extends fully to 100 meters. It’s set on a double cab truck and can lift 1200 metric tons – that’s nearly 700 automobiles.
What is the principle of Crane?
Cranes, like all machines, obey the principle of conservation of energy. This means that the energy delivered to the load cannot exceed the energy put into the machine. For example, if a pulley system multiplies the applied force by ten, then the load moves only one tenth as far as the applied force.
What type of hand signals should be used for crane safety?
OSHA enforces standards and training requirements for safe working environments across multiple industries, including construction in the United States. Stop signals are one the most important hand signals used on a construction site. When stop signals are used operation of the equipment must be halted.
What affects the amount of weight a crane can lift?
For example, if the boom of the crane is extended to 250 feet and the radius (the distance from the center of the load to the center of the crane) is 180 feet, the max load weight drops considerably. The shorter the lift, the more weight can be handled. Transportation of the cranes also needs to be considered.
What types of power does a Category 1 or 4 Crane generally use and what is its source?
Category 1 and 4 Crane Power Types Category 1 and 4 cranes generally use electric or hydraulic power that is supplied by a diesel engine. A collector ring system conveys electrical current from the revolving portion of the crane to the lower crane structure.
Is the point in the object around which its weight is evenly distributed?
Center of Gravity The center of gravity of any object is the point in the object where its weight can be assumed to be concentrated or, stated in another way, it is the point in the object around which its weight is evenly distributed.
How do you prevent employees from entering the fall zone of a suspended load?
Staying Outside to Fall Zone
- Avoid carrying loads over people. …
- At a minimum, stay at least 10 feet radius from where a suspended load could fall if there was failure. …
- Remember that a suspended load can be anything moved using equipment, like a crane, forklift, hoist or tractor bucket.
17 окт. 2018 г.