2015 crw - uncovering the root and causes of crane accidents
TRANSCRIPT
Uncovering the Root Causes of Crane Accidents
Klaus MeissnerDirector Product Strategy, Terex Cranes
Root Causes of Accidents with Mobile Cranes
• Why talking about Root Causes?
• Technical Topics vs Behavioral Issues
• More Sensors = higher Level of Safety?
• Is “Hope” really a Business Principle?
1st Accident by overload, 2nd Accident (this picture) due to improper repair
Underestimating the wind load on “light loads with large sail areas”
Austria – crane out of service, wind from the front, excessive damage, insurance (?)
Sweden, broken Slings, damages only
Norway, unknown load, outrigger forces exceed ground bearing capacity
USA, 4 Cranes lifting one load, CoG unclear, overloading one crane
Traveling at night on soft ground, Derrick Ballast grounded, crane pulled over, damages
Sweden, incorrect maintenance of hoist rope, no test lift during man basket use, 2 fatalities
The Netherlands, wind on load, boom pushed back, damages
Crane Accidents – Root Causes
Crane Accidents – Root Causes
Crane Accidents – Root Causes
Crane Accidents – Root Causes
Proper Repair and Maintenance
Mexico, insufficient inspection and maintenance, 1 fatality
/IKEA instruction manual/
Crane Accidents – Correct Assembly
… is such incident avoidable by advanced controls systems?
More Sensors =
higher Level of Safety?
… how much control do we want/accept?
Risk =
Likelihood of Occurrencemultiplied by
Amount of Exposure/Cost
… this is where human behavior
comes into the picture
Men Machine Interface – The human factor
Crane Accidents – Root Causes
UK, RCL setting wrong, damage only
Italy, RCL setting wrong, 1 fatality
Failure to Plan is
Planning for Failure
Spain, change of plan, grounded SL-CWT pulls mast over, 1 fatality
PLAN: Develop a Plan DO: Act according to PlanCHECK: Are Conditions as per Plan?ACT: …Take Action if needed
3.18 mobile crane• self powered jib crane capable of traveling loaded or
unloaded without the need for fixed runways and relying on gravity for stability. /…/
• NOTE 1Mobile cranes can operate on tires, crawlers or with other mobile arrangements. In fixed positions they can be supported by outriggers or other accessories increasing their stability. /…/
Gravity for Safety
Ground & Center of Gravity
Angle of ReposeLET`S MAKE SOME
EXPERIMENTS
Symmetrical Loading Symmetrical Loading to the Front
Non-Symmetrical Loading
Top View on Crawler car Body, Crawlers turned to better indicate Shape
Symbol indicates Centre of Gravity
Symbols indicate Ground Pressure under Crawler
Traveling on site, unsymmetrical setup of crawlers, damages
Traveling onto mats, shifting load distribution, moving CoG, damages
Traveling on site, high loading, ground gives way, 5 fatalities
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