Mich. Admin. Code R. 408.41482 - Caisson excavation; employee protection
Rule 1482.
(1)
An employee who enters a caisson shall be protected by a steel or concrete
casing designed by a qualified employee and approved by a registered
engineer.
(2) A copy of the design
specifications of the casing shall be maintained at the jobsite.
(3) In the case of belled-bottom caissons,
the steel or concrete casing shall be provided for the full depth of that part
of each caisson hole that is above the bell.
(4) An employer shall not permit an employee
to work below the casing in running or unstable soil.
(5) The steel or concrete caisson shall
extend not less than 12 inches above the ground line.
(6) Each employee who is required to enter a
caisson excavation shall have a lanyard attached to a body harness and to the
load line of a crane. The attachment to the load line shall utilize a screwpin
shackle.
(7) An employee whose
lanyard is attached to the load line of a crane shall be permitted to be
lowered to the bottom of the caisson in the muck bucket.
(8) The maximum rate of travel when lowering
an employee shall be 100 feet per minute. Free-spooling when lowering employees
into a caisson is prohibited.
(9)
All employees shall be removed from the caisson when material is being hoisted
from the caisson.
(10) A secondary
mechanical means that is capable of removing an employee from the caisson shall
be readily available in case the crane performing the caisson work breaks
down.
(11) A top person shall be
stationed at the caisson and shall constantly monitor any employees who are in
the caisson.
(12) A positive means
of communication shall be maintained between employees working in the caisson
and the top person.
(13) The air
quality of a caisson shall be tested and maintained in accordance with
Occupational Health Standard Part 665 "Underground Construction, Caissons,
Cofferdams, and Compressed Air," as referenced in
R
408.41410.
(14) Where space permits, a caisson shall
have a stairway for its entire height and shall have landing platforms not more
than 20 feet apart. Where this is impracticable, a ladder shall be installed
and landing platforms shall be located not more than 20 feet apart to break the
climb.
Notes
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