Over the past several years, we have seen many a "jury rigged" fall protection "system" on the roof tops of buildings. By this we mean a chaotic assembly of hand-tied ropes and / or cables, attached to roof vents, plumbing, HVAC equipment stands, conduits or other 'structures', thus spreading the 'load' of the suspended worker(s) and their powered platforms or boatswain chairs, or the load of a worker falling from an unprotected roof edge or walking / working surface.
FIGURE:1
Effect of a rigged horizontal line being used to suspend a 1,250 lb. working load, when the sag is only 1.2" and the line is 20' in length; the load in the line is 41,663 lbs. !!! Sag must be sufficiently increased so the load in the line is less than 5,000 lbs.
Problem #1
Ropes are
Showing posts with label Rigging. Show all posts
Showing posts with label Rigging. Show all posts
Tuesday, September 8, 2009
Fallacy of Fall Protection From Manually Rigged Horizontal Lines
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