Mich. Admin. Code R. 408.41222 - Wood pole scaffolds
Rule 1222.
(1)
Where a pole of a wood pole scaffold is spliced, the ends shall be squared and
the upper section shall rest squarely on the lower section. Wood splice plates
shall be fastened on not less than 2 adjacent sides, shall be not less than 4
feet in length, shall overlap the abutted ends equally, shall have the same
width and same total cross-sectional area of the pole, and shall be capable of
preventing displacement of the abutted ends. Splice plates of other materials
of equivalent strength may be used.
(2) A bearer shall be set with its greater
end dimension vertical and shall be long enough to project over the ledgers not
less than 3 inches for proper support.
(3) The inner end of a bearer for a single
pole scaffold shall be supported in accordance with 1 of the following:
(a) Rest in a wall of a building with not
less than a 40 inch bearing. Notching of the bearer is not permitted.
(b) Rest on a 12- by 2- by 6- inch wood
block. The block shall be notched at the center to the width of the bearer and
2 inches deep. The bearer shall be nailed to both the block and the
building.
(c) At a wall opening by
a plank capable of supporting the loaded bearer and fastened to the building.
The bearer shall be braced against displacement.
(4) A ledger shall be long enough to extend
over 2 pole spaces. The ledger shall not be spliced between the poles. The
ledger shall be reinforced by bearing blocks securely nailed to the side of the
pole to form a support for the ledger.
(5) Diagonal bracing shall be provided to
prevent the poles of a single pole scaffold from moving in a direction parallel
with the wall of the building or from buckling.
(6) Bracing shall be provided between the
inner and outer sets of poles in independent pole scaffolds. The free ends of
pole scaffolds shall be cross braced.
(7) Full diagonal face bracing, in both
directions, shall be erected across both faces of pole scaffold. The braces
shall be spliced at the poles.
(8)
Pole scaffolds over 60 feet in height shall be designed by a registered
professional engineer, and shall be constructed and loaded in accordance with
that design. Non-mandatory Appendix A to this standard contains examples of
criteria that will enable an employer to comply with design and loading
requirements for pole scaffolds under 60 feet in height.
Notes
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