Rigging Operations

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1. Slide 1

   Crane Safety on Construction Sites

   • Supervision and Management of Crane Operations
   • Rigging Operations
   • Presented by the Construction Institute of ASCE
   • Funded by an OSHA
   • Susan Harwood Training Grant
2. Slide 2

   Disclaimers

   • This material was produced under grant SH-17794-08-60-F-51 from the Occupational Safety and Health Administration, U.S. Department of Labor. It does not necessarily reflect the views and policies of the U.S. Department of Labor, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
   • This course is intended to provide general information to engineers and managers for use in identifying and addressing their responsibilities with respect to construction worksite safety. The program cannot possibly cover all safety issues that may be encountered at the construction worksite, and it is not a substitute for prudent judgment or professional expertise. It does not constitute legal advice. The information provided in this course should not be used without first securing competent advice with respect to its suitability for any general or specific application. ASCE and the Construction Institute disclaim all warranties regarding this course, whether implied, express or statutory, including without limitation, any implied warranty of merchantability, fitness for use, or fitness for a particular purpose. ASCE and the Construction Institute make no representation concerning the accuracy, completeness, suitability, or utility of any information, apparatus, method, product, or process discussed in this course and assume no liability therefore. Anyone utilizing the information provided in this course assumes all responsibility or liability arising from such use.
3. Slide 4

   Rigging

   • Concepts
   • 1. POSITIVE CONNECTION
   • 2. ROTATION
   • 3. EQUALIZATION
   • 4. CENTER OF GRAVITY
4. Slide 8

   Positive

   • Connection
5. Slide 9

   Trunnion Characteristics

   • 1. Not a positive connection
   • 2. Enables two part sling
   • 3. Easier to unhook
   • 4. Requires a vertical pull
   • 5. Good for hooking below top
   • 6. Obstructions above trunnion a problem
6. Slide 11

   BTH-1-2005: Below the Hook

   • DESIGN CATEGORY A:
   • PREDICTABLE LOADS- UP TO 50% IMPACT
   • LOW LOAD CYCLES
   • ALL CONSTRUCTION LIFTS SHOULD FALL INTO THIS CATEGORY
   • DESIGN CATEGORY B:
   • UNPREDICTABLE LOADS- UP TO 100% IMPACT
   • HIGH LOAD CYCLES
   • -SEVERE ENVIRONMENTS
7. Slide 12

   BTH-1-2005: Category A

   • DESIGN FACTORS:
   • BASED UPON YIELD STRESS
   • 2.0 FOR LIMIT STATES OF YIELDING OR BUCKLING
   • 2.4 FOR LIMIT STATES OF FRACTURE OR CONNECTION DESIGN
   • OTHER LIMITATIONS FOR SPECIFIC CASES
8. Slide 13

   BTH-1-2005: Below the Hook

   • ALSO INCLUDES:
   • PROCEDURES FOR MECHANICAL DESIGN
   • SHEAVES
   • GEARS
   • DRIVE SYSTEMS
   • BEARINGS
   • SHAFTS
   • FASTENERS
   • PROCEDURES FOR ELECTRICAL DESIGN
9. Slide 14

   Equalization

10. Slide 15

    Center of Gravity