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David Post v. Crane Rigging Corp.

David Post v. Crane Rigging Corp. Preliminary Reconstruction Presentation Drake Exhibits 2-26-08. DRAFT. Accident site overview. DRAFT. Blevins Building Supply Co. - Site Plan. US highway 21. new warehouse construction. main office / store. DRAFT. Blevins Building Supply Co. - Site Plan.

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David Post v. Crane Rigging Corp.

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  1. David Post v. Crane Rigging Corp. Preliminary Reconstruction PresentationDrake Exhibits 2-26-08 DRAFT

  2. Accident site overview DRAFT Blevins Building Supply Co. - Site Plan

  3. US highway 21 new warehouse construction main office / store DRAFT Blevins Building Supply Co. - Site Plan

  4. date of accident - 00-00-00 US highway 21 new warehouse construction main office / store DRAFT Plan View - Blevins Building Supply Co.

  5. DRAFT New warehouse construction

  6. roof trusses set exterior wall framing stack of roof trusses to be set DRAFT New warehouse construction

  7. show crane Trusses are lifted by crane and set on top of exterior wall frame DRAFT New warehouse construction

  8. Accident Sequence DRAFT

  9. DRAFT Trusses are stacked in parking lot

  10. DRAFT Trusses are rigged to crane using a spreader bar approx. 20’ long

  11. DRAFT Spreader bar is attached to truss with chains at each end

  12. DRAFT Truss is lifted to vertical from stack

  13. DRAFT

  14. DRAFT Truss bends and tilts when lifted off stack

  15. DRAFT A tag line is used to control movement of the truss

  16. DRAFT Truss bends and flops around while being moved to building

  17. DRAFT Truss is swung around to south end of building

  18. DRAFT

  19. DRAFT Truss is moved to the north

  20. DRAFT

  21. DRAFT

  22. DRAFT

  23. Randall ________ David Post & Roger Billings DRAFT Worker positions on scissor lifts

  24. Randall ________ David Post & Roger Billings DRAFT Truss is lowered toward final position

  25. David Post & Roger Billings DRAFT Truss breaks at attachment point severely injuring David Post

  26. Accident is Result of Improper Rigging of Truss DRAFT

  27. Rigging Trusses DRAFT

  28. Chain angle more than 60º Spreader bar only attached at ends Spreader bar is too high on truss Spreader bar is too short 80 Feet DRAFT Accident rigging dangerously inadequate for 80 foot long truss

  29. Chain angle 60º or less Attachment points to truss at a maximum of 10 foot intervals Locate spreader bar at or above mid-height Spreader bar is 2/3 to 3/4 truss length 80 Feet DRAFT Proper method for rigging an 80 Foot Long Truss From BCSI-B1 Guide for Handling, Installing, Restraining & Bracing of Trusses

  30. 1. Calculation of Stress and Deformation of the Truss During Lifting Operations ANSYS Finite Element Analysis computer software used for all results Actual incident truss geometry and material properties incorporated in analysis Truss lifting points obtained from witness statements DRAFT

  31. 1. Calculation of Stress and Deformation of the Truss During Lifting Operations DRAFT

  32. 2. Animation of Truss Deformation During Lifting Operation DRAFT This movie will play automatically - click to stop

  33. 3. Animation of Truss Deformation During Lifting Operation - close up of maximum stress location DRAFT Click this movie to play - click again to stop

  34. 4. Truss Deformation as it Leaves the Truss Stack DRAFT

  35. 5. Validation of the Computer Model of the Truss Measure actual load-displacement response of an exemplar truss at Tru-Line Truss Company Compare the measured values with that predicted by the computer model DRAFT

  36. 5. Validation of the Computer Model of the Truss DRAFT

  37. Modeling Stresses in Wooden Trusses During Lifting and Moving DRAFT

  38. Improper method of rigging DRAFT Trusses are improperly rigged using a spreader bar approx. 20’ long

  39. Highest stress is at the point of attachment DRAFT Stress shown in truss structure as truss is lifted off pile

  40. DRAFT Truss bends and twists when lifted using inadequate rigging

  41. DRAFT Truss breaks at point of attachment to spreader bar

  42. Proper method of rigging DRAFT Trusses are rigged to crane using a spreader bar approx. 60’ long

  43. Stress shown in truss structure as truss is lifted off pile

  44. DRAFT Stress shown in truss structure as truss is moved to building

  45. DRAFT

  46. DRAFT Stress shown in truss structure as truss is set and fastened to top plate

  47. END Drake Exhibits - Demonstrative Evidence Services 1275 Main Street Brewster, MA 02631 508-255-8194 www.Drake-Exhibits.com DRAFT

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