Workplace Safety And Health Regulation
247
UPRIGHTS (Vertical Members) STRINGERS
/ WALES
(Horizontal
Members)*
CROSS-BRACES, STRUTS (Horizontal)*
Category 1a
Stiff clays and
stiff
to hard
clay tills, and
stiff fissured
clays
Depth
Member
minimum
dimensions
Maximum
spacing
horizontally
Member
minimum
dimensions
Maximum
spacing
horizontally
Member minimum
dimensions (mm)
Maximum
spacing vertically
(to match
Stringers / Wales)
Maximum
spacing
horizontally
along
Stringers /
Wales
Width of Trench (m)
(m)
(mm)
(mm)
(mm)
(mm)
less than
1.8 m.
1.8 m. to
3.7 m.
(mm)
(mm)
1.5 - 3.0 m
38 x 235
384
89 x 140
1200
89 x 89
140 x 140
1200
1291
3.0 - 4.5 m
38 x 235
344
191 x 191
915
89 x 89
140 x 140
915
1475
UPRIGHTS (Vertical)
STRINGERS
/ WALES
(Horizontal)
CROSS-BRACES, STRUTS (Horizontal)
Category 1b
Stiff fissured
soils, and stiff
clay fills
Depth
Member
minimum
dimensions
Maximum
spacing
horizontally
Member
minimum
dimensions
Maximum
spacing
horizontally
Member minimum
dimensions (mm)
Maximum
spacing vertically
(to match
Stringers / Wales)
Maximum
spacing
horizontally
along
Stringers /
Wales
Width of Trench (m)
(m)
(mm)
(mm)
(mm)
(mm)
less than
1.8 m.
1.8 m. to
3.7 m.
(mm)
(mm)
1.5 - 3.0 m
89 x 140
686
89 x 140
1200
89 x 89
140 x 140
1200
796
3.0 - 4.5 m
89 x 140
564
191 x 191
915
89 x 89
140 x 140
915
939
UPRIGHTS (Vertical)
STRINGERS
/ WALES
(Horizontal)
CROSS-BRACES, STRUTS (Horizontal)
Category 2
Soft cohesive
soils, and stiff
to wet/loose
silt soils
Depth
Member
minimum
dimensions
Maximum
spacing
horizontally
Member
minimum
dimensions
Maximum
spacing
horizontally
Member minimum
dimensions (mm)
Maximum
spacing vertically
(to match
Stringers / Wales)
Maximum
spacing
horizontally
along
Stringers /
Wales
Width of Trench (m)
(m)
(mm)
(mm)
(mm)
(mm)
less than
1.8 m.
1.8 m. to
3.7 m.
(mm)
(mm)
1.5 - 3.0 m
38 x 235
229
89 x 140
1200
89 x 89
140 x 140
1200
918
3.0 - 4.5 m
89 x 140
457
191 x 191
915
89 x 89
140 x 140
915
887
Workplace Safety And Health Regulation
248
UPRIGHTS (Vertical)
STRINGERS
/ WALES
(Horizontal)
CROSS-BRACES, STRUTS (Horizontal)
Category 3a
Cohesionless:
loose to me-
dium dense
soils
Depth
Member
minimum
dimensions
Maximum
spacing
horizontally
Member
minimum
dimensions
Maximum
spacing
horizontally
Member minimum
dimensions (mm)
Maximum
spacing vertically
(to match
Stringers / Wales)
Maximum
spacing
horizontally
along
Stringers /
Wales
Width of Trench (m)
(m)
(mm)
(mm)
(mm)
(mm)
less than
1.8 m.
1.8 m. to
3.7 m.
(mm)
(mm)
1.5 - 3.0 m
38 x 235
326
89 x 140
1200
89 x 89
140 x 140
1200
1193
3.0 - 4.5 m
38 x 235
293
191 x 191
915
89 x 89
140 x 140
915
1359
UPRIGHTS (Vertical)
STRINGERS
/ WALES
(Horizontal)
CROSS-BRACES, STRUTS (Horizontal)
Category 3b
Cohesionless:
dense to very
dense soils
Depth
Member
minimum
dimensions
Maximum
spacing
horizontally
Member
minimum
dimensions
Maximum
spacing
horizontally
Member minimum
dimensions (mm)
Maximum
spacing vertically
(to match
Stringers / Wales)
Maximum
spacing
horizontally
along
Stringers /
Wales
Width of Trench (m)
(m)
(mm)
(mm)
(mm)
(mm)
less than
1.8 m.
1.8 m. to
3.7 m.
(mm)
(mm)
1.5 - 3.0 m
38 x 235
460
89 x 140
1200
89 x 89
140 x 140
1200
1414
3.0 - 4.5 m
38 x 235
415
191 x 191
915
89 x 89
140 x 140
915
1616
* Notes for Table:
1. All spacings shown are centre-to-centre of members.
2. Design based on 086.1-2001 Wood Design Manual; all “uprights”
(vertical shoring) to be minimum 2-span continuous (cantilevers not to be
included as “spans”). All shoring assumed to have members orientated for
weak-axis bending.
3. All members to be graded lumber meeting S.P.F. No. 2 or better.
4. In this Schedule:
“strut” means a horizontal cross-member of shoring that directly resists
pressure; (« étrésillon »)
“upright” means a vertical shoring member that is placed against and
directly resists pressure
from a wall of an excavation; (« montant »)
“wale” means a horizontal shoring member that is placed parallel to
the excavation face and whose sides bear against the vertical shoring
member or the earth.
M.R. 128/2019
Workplace Safety And Health Regulation
250
PART 27
WORK IN A COMPRESSED
AIR ENVIRONMENT
Application
27.1
This Part applies to every workplace where work is done in a
compressed air environment, but does not apply to divers or to
persons working in diving bells.
Safe work procedures
27.2
An
employer must
(a) develop and implement safe work procedures for working in a
compressed air environment;
(b) train workers who may perform work in a compressed air
environment in those safe work procedures; and
(c) ensure that workers comply with those safe work procedures.
General requirements
27.3(1) An employer must, before allowing or permitting a worker to enter a
compressed air environment,
(a) ensure that the branch is notified of the nature and location
of
the work in writing, at least 30 days in advance of the work
beginning; and
(b) establish a comprehensive work plan for work in compressed air
that
(i) has been developed and approved by a professional
engineer, and
(ii) meet the requirements of CSA Z275.3-09 (R2014),
Occupational safety code for work in compressed air
environments.
27.3(2) An employer must ensure that work done in a compressed air
environment is done in accordance with the work plan established
under clause (1)(b).
M.R. 90/2014; 128/2019
Workplace Safety And Health Regulation
251
PART 28
SCAFFOLDS AND OTHER
ELEVATED WORK PLATFORMS
GENERAL
REQUIREMENTS
Application
28.1(1) This Part applies to every workplace where work takes place using a
scaffold or elevated work platform.
28.1(2) Except for work of short duration that can be done safely from a
ladder, an employer must ensure that a worker engaged in work that
cannot be done from the ground or other safe elevation is provided
with a scaffold or an elevated work platform.
Safe work procedures
28.2(1) When a scaffold or an elevated work platform is required to be
provided at a workplace, the employer must
(a) develop and implement safe work procedures for using the
scaffold or elevated
work platform provided;
(b) train workers who work on scaffolds and elevated platforms in
those safe work procedures; and
(c) ensure that the workers comply with those safe work
procedures.
28.2(2) An employer must ensure that the safe work procedures developed
in subsection (1) include emergency response and rescue procedures
appropriate to the risks associated with the failure of a scaffold or
other elevated work platform.
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