Mich. Admin. Code R. 408.41227 - Pump jack scaffolds
Rule 1227.
(1)
Pump jack brackets, braces, and accessories shall be fabricated from metal
plates and angles. Each bracket shall have 2 positive gripping mechanisms to
prevent any failure or slippage.
(2) A pole shall comply with both of the
following provisions:
(a) Be secured to the
structure by rigid triangular bracing, or equivalent, at the bottom, top, and
other points as necessary to provide a maximum vertical spacing of not more
than 10 feet between braces. Each brace shall be capable of supporting not less
than 225 pounds tension or compression.
(b) Be made of 2, 2 by 4s of Douglas fir, or
the equivalent, or 2 continuous lengths made of 2 by 4s spiked together, with
the seam parallel to the bracket, with 10D common nails at not more than 12
inches center to center, staggered uniformly from opposite outside edges. Each
2 by 4 may be spliced to make up a pole if the splice is constructed to develop
the full strength of the member.
(3) Where the bracket must pass bracing
already installed, an extra brace shall be used approximately 4 feet above the
one to be passed until the original brace is reinstalled.
(4) If poles are made of wood, then the pole
lumber shall be straight-grained and free of shakes, large loose or dead knots,
and other defects that might impair strength.
Notes
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