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OSHA Office of Training & Education1 Cranes. 2 Major Causes of Crane Accidents Contact with power lines Overturns Falls Mechanical failures.

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Presentation on theme: "OSHA Office of Training & Education1 Cranes. 2 Major Causes of Crane Accidents Contact with power lines Overturns Falls Mechanical failures."— Presentation transcript:

1 OSHA Office of Training & Education1 Cranes

2 2 Major Causes of Crane Accidents Contact with power lines Overturns Falls Mechanical failures

3 OSHA Office of Training & Education3 Instability – unsecured load, load capacity exceeded, or ground not level or too soft Lack of communication - the point of operation is a distance from the crane operator or not in full view of the operator Lack of training Inadequate maintenance or inspection How Do Accidents Occur?

4 OSHA Office of Training & Education4 Who is at Risk Operators Persons at Crane Site

5 OSHA Office of Training & Education5 Causes of crane-related deaths in construction, Overhead power line electrocutions- 102 Crane collapses- 68 Struck by crane booms/jibs - 59

6 OSHA Office of Training & Education6 Causes of crane-related deaths in construction, Struck by crane loads – 24 Caught in/between – 21 Struck by cranes – 18 Other causes - 31

7 OSHA Office of Training & Education7 Causes of crane-related deaths in construction, Total- 323

8 OSHA Office of Training & Education8 Improper load rating Excessive speeds No hand signals Inadequate inspection and maintenance Unguarded parts Unguarded swing radius Crane Hazards Working too close to power lines Improper exhaust system Shattered windows No steps/guardrails walkways No boom angle indicator Not using outriggers

9 OSHA Office of Training & Education9 Competent Person The competent person must inspect all machinery and equipment prior to each use, and during use, to make sure it is in safe operating condition. If it needs fixing, take it out of service and don’t use it until it is fixed PLANNING BEFORE START UP Broken Track

10 OSHA Office of Training & Education10 Load Capacity - Speed - Warnings Make sure the crane operator can see the:  Rated Load Capacities  Operating Speeds  Special Hazard Warning or Instruction Load Rating Chart

11 OSHA Office of Training & Education11 Load Example – 30 ton crane Will lift 60,000 pounds at 10 feet from the center pin of the crane Based on level surface, no wind, and outriggers fully extended At 25 feet from the center pin with an 80 foot boom, the capacity is only 14,950 pounds At 74 feet from the center pin, the capacity is only 4,800 pounds

12 OSHA Office of Training & Education12 Improper Load Improper loads or speeds can result in the tipping of the crane

13 OSHA Office of Training & Education13 Stay clear from power lines at least 10 feet Power Lines

14 OSHA Office of Training & Education14 An illustration of the signals must be posted at the job site Hand Signals

15 OSHA Office of Training & Education15 Guard Moving Parts Unguarded Chain Drive Guard moving parts such as gears or belts

16 OSHA Office of Training & Education16 Swing Radius Stay out of the swing radius of the crane – Make sure there are barrier guards showing swing radius

17 OSHA Office of Training & Education17 Operator Visibility Broken Window Make sure broken windows or other obstructions do not prevent the operator from seeing

18 OSHA Office of Training & Education18 Guardrails Runways and steps need to have guardrails, handholds and slip resistant surfaces

19 OSHA Office of Training & Education19 Suspended Loads Don’t stand under suspended loads

20 OSHA Office of Training & Education20 Supporting Surface Cranes must be on a firm supporting surface and level within 1 percent

21 OSHA Office of Training & Education21 The grooves must be smooth and free from surface defects which could cause rope damage Sheaves

22 OSHA Office of Training & Education22 Rigging Equipment Slings Types of slings include alloy steel chain, wire rope, metal mesh, natural or synthetic fiber rope, and synthetic web. ChainWire ropeMetal meshSynthetic

23 OSHA Office of Training & Education23 Annual Inspections Inspection of the hoisting machinery must be made by a competent person The employer must maintain a record of these inspections Crane wasn’t inspected and tipped over

24 24 Big Blue 567- foot crane

25 OSHA Office of Training & Education25 July 14 th, 1999 Three construction workers were killed when the Big Blue crane lifting the 400 ton section of a retractable roof bent in half and collapsed inside the new Miller Park stadium being built for the Milwaukee Brewers An estimated 1,200 tons of concrete and debris fell, killing the workers and injuring five others. The three men that sustained fatal injuries were in a cage at the time being hoisted by another crane.

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28 OSHA Office of Training & Education28 What to Inspect Correct air pressure and no leaks Tires properly inflated Clearance for tail swing Wire rope wear Physical damage to crane Loose or missing hardware, nuts, or bolts Fluid leaks

29 OSHA Office of Training & Education29 Damaged wire rope Broken Strands Damaged wire rope must be taken out of service Crushed Rope

30 OSHA Office of Training & Education30 Worn Part

31 OSHA Office of Training & Education31 Conduct regular inspections of tires for excessive wear or damage Tire Inspections

32 OSHA Office of Training & Education32 Training Operators:  must qualify on specific crane type  Must include on-the-job training Supervisor / competent person

33 OSHA Office of Training & Education33 Summary An unstable load, lack of communication, lack of training, and inadequate maintenance or inspection are major contributors to crane accidents. Operators or others working in the area can be victims to “struck by" and "caught in" injuries. Contact with power lines causes many accidents. A competent person must inspect a crane regularly to insure it is in proper order. Planning and training reduces accidents.


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