2022 Manitoba Workplace Safety and Health Act and Regulation

Support structure in firm contact
26.23(1) An employer must ensure that a support structure in an excavation
is installed firmly in contact with the walls of an excavation and any
voids between the structure and the walls are back-filled.
26.23(2) Subsection (1) does not apply to a trench cage.
Wood shoring
26.24(1) If wood shoring is used in an excavation, an employer must ensure
that
(a) the shoring components are of a size, composition and
arrangement to safely support the walls of the excavation; and
(b) the lumber used meets the requirements set out in the Schedule
to this Part.
26.24(2) An employer may provide a steel trench jack of equivalent strength
to wood shoring to be used as a strut in a trench.
No worker to enter
26.25
An employer must ensure that a worker does not enter any part of a
trench beyond the point to which shoring has advanced.
Trench excavation by mechanical equipment
26.26(1) When a trench is being excavated by a trench digger, backhoe or
similar equipment, the operator of the equipment must
(a) ensure that the digging portion of the machinery or equipment
remains in the excavation while shoring is proceeding; and
(b) maintain a clear view of all workers in and near the trench.
26.26(2) The operator of equipment excavating a trench must ensure that the
equipment does not come into contact with the shoring.

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Workplace Safety And Health Regulation
241
Trench cages
26.27(1) An employer must ensure that a trench cage is constructed and used
in accordance with design specifications certified by a professional
engineer.
26.27(2) An employer must ensure that the sides of a trench cage are
continuous and extend at least 300 mm above the vertical wall of an
excavation.
26.27(3) If a trench cage is used, an employer must ensure that a worker does
not work in the excavation unless the worker works from inside the
trench cage.
26.27(4) When trench cages are stacked, an employer must ensure that the
trench cages have been
(a) designed for stacking by a professional engineer; and
(b) stacked in accordance with a stacking method specified by the
professional engineer.
DEEP FOUNDATION EXCAVATIONS