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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 24. PUBLIC SPACE AND SAFETY |
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Chapter 24-32. OCCUPATIONAL SAFETY: WINDOW CLEANING |
Section 24-3204. ANCHOR MATERIAL AND SPECIFICATIONS
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3204.1Anchors shall be of the twin or double-head type designed for attachment to window frames or mullions by two (2) through bolts to each anchor.
3204.2Anchors shall be made of the following metals:
(a)Heavy forged bronze;
(b)Stainless steel;
(c)Monel metal, or copper-nickel alloy equivalent to monel metal; or
(d)Other approved durable corrosion-resistive metal of equal strength and toughness.
3204.3Metals used in the manufacture of anchors and anchor fittings shall have an ultimate tensile strength of not less than fifty-five thousand pounds per square inch (55,000 lbs./in.2), with an elongation of a least twenty-five percent (25%) in two inches (2 in.) and shall have corrosion resistance of sixty percent (60%) as compared to copper.
3204.4Anchors shall be seven-sixteenths of an inch (7/16 in.) in diameter, and the head of each anchor shall be three-quarters of an inch (3/4 in.) across the flat and not less than five-sixteenths of an inch (5/16 in.) thick.
3204.5Anchors shall be designed or spaced so that it is impossible to attach the safety belt terminal to a single head.
3204.6Drop forgings shall have one-eighth inch (1/8 in.) radius fillets at all places where diameters or other dimensions change. Wall flanges shall have a diameter that is not less than one and one-quarter inches (11/4 in.).
3204.7The space between the anchor head and the flange or window frame shall be not less than one-half of an inch (1/2 in.) or more than seven-eighths of an inch (7/8 in.).
3204.8Double anchor heads shall be spaced not less than two inch (2 in.) or more than three inches (3 in.) from the centers.
3204.9The back face of anchors for installation in wood window frames or mullions shall be provided with at least two (2) sharp lugs to prevent turning of the anchor after installation.
3204.10All anchors and anchor fittings shall be capable of withstanding the following tests:
(a)A tension pull of six thousand (6,000) pounds without fracture. The tension shall be applied through a belt terminal and in the direction that the anchor must withstand in service when a person falls;
(b)A drop test of three hundred fifty (350) pounds dead weight (not sand) falling a distance of four feet (4 ft.) without fracture. The connection between the weight and anchor shall be a standard safety belt or ropes or cables not over six feet (6 ft.) long; and
(c)An impact test of an iron weight of thirty-two (32) pounds falling free a distance of four feet (4 ft.), and striking the head of the anchor without fracture.