Mich. Admin. Code R. 408.40943 - Additional requirements for trench support systems
Rule 943.
(1)
Members of support systems shall be securely connected together to prevent
sliding, falling, kickouts, or other predictable failure.
(2) The backfilling and the removal of a
support system for a trench shall progress together from the bottom of the
trench. In unstable or running soil, the jacks and braces shall be removed from
above the trench after employees have cleared the trench.
(3) The excavation of material to a level
that is not more than 2 feet, .61 m, below the bottom of the members of a
support system shall be permitted, but only if the system is designed to resist
the forces calculated for the full depth of the trench and if there are no
indications, while the trench is open, of a possible loss of soil from behind
or below the bottom of the support system.
(4) The installation of a support system
shall be closely coordinated with the excavation of trenches.
(5) Support systems shall be installed and
removed in a manner that protects employees from cave-ins, structural
collapses, or from being struck by members of the support system.
(6) Individual members of support systems
shall not be subjected to loads exceeding those which those members were
designed to withstand.
(7) Before
temporary removal of individual members begins, additional precautions shall be
taken to ensure the safety of employees, such as installing other structural
members to carry the loads imposed on the support system.
Notes
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