More than 50% of industrial buildings in steel erection are systems-engineered. These metal structures use different types of steel members and a different erection process than typical steel erection. They also present certain unique hazards, such as those associated with anchor bolts, construction loads, and double connections.
All of the requirements contained in 1926 Subpart R apply to systems-engineered metal buildings, except for 1926.755 (column anchorage) and 1926.757 (open web steel joists).
Construction loads may be placed on a structural steel framework when the framework is safely bolted, welded or otherwise adequately secured.
Construction loads are prohibited from:
In girt and eave strut-to-frame connections, when girts or eave struts share common connection holes:
Purlins and girts are prohibited from:
A real, everyday hazard posed to steel erection employees is loose items that have been placed aloft, and that can fall and strike employees working below. The following requirements listed on the next two tabs have been implemented to protect employees from falling objects.
Securing loose items aloft. Secure unused equipment, tools and materials while aloft so they do not fall.Protection from falling objects other than materials being hoisted. The controlling contractor must bar other construction processes below steel erection activities, unless overhead protection for employees working below is provided.
Joist manufacturers require that the ends of joists be tack welded or bolted immediately after placement. This welding or bolting holds the joist in place until the bridging is installed, and as a result the joist has very little lateral stability.
Placing any weight on the joist other than the weight of the employee actually erecting the joists can cause the joist to roll over or slip.
If the joist slips, it can:
If the joist falls over, it can collapse or buckle. This can:
Employees on the elevated work areas could:
Employees working under or near the elevated work could:
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