| 摘要 |
This invention provides fail protection systems comprising a suspension fabric, supported by a grid-work of longitudinal and lateral bands, in metal building construction. The fall protection system uses the combination of relatively softer banding, a safety band spaced a particular distance from each rafter, and safety clips to attach the safety bands to the intermediate purlins, thus to distribute the force of impact of a load, falling close to a rafter, to better absorb and dissipate the force of the impact, including distributing the impact of the failing load over a greater area of the roof structure. The invention further provides methods of making elements of such systems, methods of installing elements of such systems, and buildings embodying such systems. |
| 主权项 |
1. A fall protection system in a building roof structure, such building roof structure including structural roof elements which include at least first and second rafters, a space between said first and second rafters defining a first distance between said first and second rafters, each said rafter having a length, a top, and opposing first and second ends, said roof structure further comprising an eave, having a length, and extending between the first ends of said first and second rafters, a ridge, having a length, and extending between the second ends of said first and second rafters, and a second distance between said eave and said ridge, said eave and said ridge being disposed on, extending transverse to, and being connected to, the tops of said first and second rafters, and a plurality of intermediate purlins extending between said first and second rafters and spaced from each other between said eave and said ridge, said intermediate purlins being disposed on, and extending transverse to, the tops of said first and second rafters, said fall protection system comprising:
(a) a first set of longitudinal support bands extending from said first rafter to said second rafter and being connected to said building structural roof elements, said first set of longitudinal support bands being spaced along the lengths of said first and second rafters; (b) a second set of lateral support bands extending from said eave toward said ridge and under said intermediate purlins, said lateral bands of said second set of support bands having first and second end portions which are spaced along the lengths of said eave and said ridge; and (c) a suspension fabric overlying, and being supported by, said first and second sets of support bands, and being attached to said building structural roof elements,a first band of said second set of lateral support bands, next adjacent said first rafter, comprising a safety band and being spaced from said first rafter by a distance of 12 inches to 23 inches, and having at least one of
(i) a yield strength of 45 ksi to 85 ksi, or (ii) a tensile strength of 60 ksi to 90 ksi, or (iii) an elongation of 12 percent to 40 percent,said safety band extending from said ridge to said eave under each of said intermediate rafters, and being attached, for restraint of longitudinal movement of said safety band, at less than all of said intermediate purlins. |
