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David Post v. Crane Rigging Corp. Preliminary Reconstruction Presentation Drake Exhibits 2-26-08 DRAFT.

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Presentation on theme: "David Post v. Crane Rigging Corp. Preliminary Reconstruction Presentation Drake Exhibits 2-26-08 DRAFT."— Presentation transcript:

1 David Post v. Crane Rigging Corp. Preliminary Reconstruction Presentation Drake Exhibits DRAFT

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

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

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

5 New warehouse construction DRAFT

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

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

8 Accident Sequence DRAFT

9 Trusses are stacked in parking lot DRAFT

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

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

12 Truss is lifted to vertical from stack DRAFT

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14 Truss bends and tilts when lifted off stack

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

16 Truss bends and flops around while being moved to building

17 Truss is swung around to south end of building DRAFT

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19 Truss is moved to the north DRAFT

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

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

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

26 Accident is Result of Improper Rigging of Truss DRAFT

27 Rigging Trusses DRAFT

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

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

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 Measure actual load-displacement response of an exemplar truss at Tru-Line Truss Company 5. Validation of the Computer Model of the Truss 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 Trusses are improperly rigged using a spreader bar approx. 20’ long Improper method of rigging DRAFT

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

40 Truss bends and twists when lifted using inadequate rigging DRAFT

41 Truss breaks at point of attachment to spreader bar DRAFT

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

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

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

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

47 Drake Exhibits - Demonstrative Evidence Services 1275 Main Street Brewster, MA END DRAFT


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