Section 408.42605. Definitions; D to M.

(1) "Decking hole" means a gap or void more than 2 inches (5.1 cm) in its least dimension and less than 12 inches (30.5 cm) in its greatest dimension in a floor, roof, or other walking/working surface. Pre-engineered holes in cellular decking for wires, cables, and the like are not included in this definition.

(2)   "Derrick floor" means an elevated floor of a building or structure that has been designated to receive hoisted pieces of steel before final placement.

(3)   "Double connection" means an attachment method where the connection point is intended for 2 pieces of steel that share common bolts on either side of a central piece.

(4)      "Double connection seat" means a structural attachment that, during the installation of a double connection, supports the first member while the second member is connected.

(5)    "Erection bridging" means the bolted diagonal bridging that is required to be installed before releasing the hoisting cables from the steel joists.

(6)   "Fall restraint system" means a fall protection system that prevents the user from falling any distance. The system is comprised of either a body belt or body harness, together with an anchorage, connectors, and other necessary equipment. The other components typically include a lanyard, and may also include a lifeline and other devices.

(7)   "Final interior perimeter" means the perimeter of a large permanent open space within a building such as an atrium or courtyard. This does not include openings for stairways, elevator shafts, and the like.

(8)     "Girt, in systems-engineered metal buildings" means a "Z" or "C" shaped member formed from sheet steel spanning between primary framing and supporting wall material.

(9)   "Headache ball" means a solid iron weight, usually spherical, used to keep the loadline taut and positioned above the hook.

(10)     "Hoisting equipment" means commercially manufactured lifting equipment designed to lift and position a load of known weight to a location at some known elevation and horizontal distance from the equipment's center of rotation. "Hoisting equipment" includes, but is not limited to, all of the following:

(a)   Cranes.

(b)   Derricks.

(c)   Tower cranes.

(d)  Barge-mounted derricks or cranes.

(e)   Gin poles.

(f)  Gantry hoist systems.

A "come-a-long," that is, a mechanical device, usually consisting of a chain or cable attached at each end, that is used to facilitate movement of materials through leverage is not considered "hoisting equipment."

(11)     "Leading edge" means the unprotected side and edge of a floor, roof, or formwork for a floor or other walking/working surface, such as a deck, which changes location as additional floor, roof, decking, or formwork sections are placed, formed, or constructed.

(12)    "Metal decking" means a commercially manufactured, structural grade, cold- rolled metal panel formed into a series of parallel ribs. As used in this part, the term includes metal floor and roof decks, standing seam metal roofs, other metal roof systems, and other products, such as bar gratings, checker plate, expanded metal panels, and similar products. After installation and proper fastening, these decking materials serve a combination of functions, including, but not limited to, any of the following:

(a)     A structural element designed in combination with the structure to resist, distribute, and transfer loads, stiffen the structure, and provide a diaphragm action.

(b)   A walking/working surface.

(c)   A form for concrete slabs.

(d)  A support for roofing systems.

(e)   A finished floor or roof.

(13)    "Multiple lift rigging" means a rigging assembly manufactured by wire rope rigging suppliers that facilitates the attachment of up to 5 independent loads to the hoist rigging of a crane.

History: 2002 AACS; 2007 AACS; 2014 AACS.