Mich. Admin. Code R. 408.40925 - Definitions A to Q
Rule 925.
(1)
"Angle of repose" means the maximum permissible slope as determined by table
1.
(2) "Benching" means a method of
protecting employees from cave-ins by excavating the sides of an excavation to
form 1 or a series of horizontal levels or steps, usually with vertical or
near-vertical surfaces between levels.
(3) "Braces" or "struts" means the horizontal
cross members of a shoring system that bear against the uprights or
stringers.
(4) "Cave-in" means the
separation of a mass of soil or rock material from the side of an excavation,
or the loss of soil from under a trench shield or support system, and its
sudden movement into the excavation, either by falling or sliding, in
sufficient quantity so that it could entrap, bury, or otherwise injure and
immobilize a person.
(5) "Competent
person" means an individual who is capable of identifying existing and
predictable hazards in the surroundings or working conditions which are
unsanitary, hazardous, or dangerous to employees, and who has authorization to
take prompt corrective measures to eliminate them.
(6) "Excavation" means any man-made cut,
cavity, trench, or depression in the earth's surface, including its sides,
walls, or faces, formed by earth removal.
(7) "Hazardous atmosphere" means an
atmosphere which by reason of being any of the following, may cause death,
illness, or injury:
(a) Explosive.
(b) Flammable.
(c) Poisonous.
(d) Corrosive.
(e) Oxidizing.
(f) Irritating.
(g) Oxygen deficient.
(h) Toxic.
(i) Otherwise harmful.
(8) "Kickout" means the accidental release or
failure of a stringer or brace.
(9)
"Protective system" means a method of protecting employees from cave-ins, from
material that could fall or roll from an excavation face or into an excavation,
or from the collapse of adjacent structures. Protective systems include support
systems, sloping and benching systems, shield systems, and other systems that
provide the necessary protection.
(10) "Qualified person" means an individual
who, by possession of a recognized degree or certificate of professional
standing, or who, by extensive knowledge, training, and experience, has
successfully demonstrated the ability to solve or resolve problems relating to
the subject matter and work.
(11)
"Ramp" means an inclined walking or working surface that is used to gain access
to 1 point from another and is constructed from earth or from structural
materials such as steel or wood.
(12) "Registered professional engineer" means
a person who is registered as a professional engineer in the state where the
work is to be performed. However, a professional engineer, registered in any
state is deemed to be a registered professional engineer within the meaning of
this standard when approving designs for manufactured protective systems or
tabulated data to be used in interstate commerce.
Notes
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