Mich. Admin. Code R. 408.40933 - Excavation; obstructions; retaining materials; egress; guarding; heavy equipment
Rule 933.
(1) A
tree, boulder, rock fragment, or other obstruction whose movement could cause
injury to an employee shall be removed or supported.
(2) An excavation that an employee is
required to enter shall have excavated and other material stored and retained
not less than 2 feet from the excavation edge.
(3) When mobile equipment is utilized or
permitted adjacent to an excavation where the operator's vision is restricted,
stop logs or barricades shall be utilized or a signal person shall be
used.
(4) An excavation 48 or more
inches in depth and occupied by an employee shall be provided with either a
ladder extending not less than 3 feet above the top as a means of access or
with a ramp meeting the requirements of subrule (5) of this rule. Lateral
travel along the wall of a trench to a ladder or other means of egress shall
not exceed 25 feet.
(5) An earth
ramp may be used in place of a ladder if it meets all of the following
requirements:
(a) The ramp material shall be
stable.
(b) The sides of the
excavation above the ramp shall be maintained to the angle of repose or sheeted
or shored along the means of egress.
(c) The degree of angle of the ramp shall not
be more than 45 degrees.
(d)
Vertical height between the floor of the trench and the toe of the ramp shall
not exceed 30 inches.
(6)
Structural ramps that are used solely by employees as a means of access or
egress from excavations shall be designed by a competent person. Structural
ramps used for access or egress of equipment shall be designed by a competent
person qualified in structural design and shall be constructed in accordance
with the design.
(7) Ramps and
runways constructed of 2 or more structural members shall have the structural
members connected together to prevent displacement.
(8) Structural members used for ramps and
runways shall be of uniform thickness.
(9) Cleats or other appropriate means used to
connect runway structural members shall be attached to the bottom of the runway
or shall be attached in a manner to prevent tripping.
(10) Structural ramps used in lieu of steps
shall be provided with cleats or other surface treatments on the top surface to
prevent slipping.
Notes
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