Review Extraction
Page 1
Not checked
Page 2
Accurate
Page 3
Accurate
Page 4
Not checked
Page 5
Not checked
Page 6
Not checked
Page 7
Not checked
Page 8
Not checked
Page 9
Not checked
Page 10
Not checked
Page 11
Not checked
Page 12
Not checked
Page 13
Not checked
Page 14
Not checked
Page 15
Not checked
Page 16
Not checked
Page 17
Not checked
Page 18
Not checked
Page 19
Not checked
Page 20
Not checked
Page 21
Not checked
Page 22
Not checked
Page 23
Not checked
Page 24
Not checked
Page 25
Not checked
Page 26
Not checked
Page 27
Not checked
Page 28
Not checked
Page 29
Not checked
Page 30
Not checked
Page 31
Not checked
Page 32
Not checked
Page 33
Not checked
Page 34
Not checked
Page 35
Not checked
Page 36
Not checked
Page 37
Not checked
Page 38
Not checked
Page 39
Not checked
Page 40
Not checked
Extracted Text
B. Excavation boxes and trench shields shall be designed, constructed and
maintained to provide protection equal to or greater than the required
shoring, sloping or benching. The design for custom-made excavation
boxes or trench shields shall be reviewed by CSD before use.
C. Excavation boxes and trench shields shall be installed in accordance with
the manufacturer’s instructions and to restrict lateral or other movement of
the box or trench shield. Excavation boxes and trench shields shall be
capable of withstanding any sudden application of lateral loads.
D. Excavation boxes and trench shields shall be extended a minimum of 0.45
m (1.5 ft) above the excavation.
1.7.3 Hydraulic Shoring for Excavations
Hydraulic shoring can be used for protection against cave-ins in
excavations that do not exceed 6 m (20 ft) in depth (see Figures 1.12 and
1.13, and Tables 1.4 to 1.6).
1.7.4 Timber Shoring for Excavations (see Figure 1.14)
A. Timber shoring can be used as a method of protection against cave-ins in
excavations that do not exceed 6 m (20 ft) in depth.
B. Timbers shall be sound, free from large or loose knots and have proper
dimensions.
C. Timber shoring shall be designed in accordance with Tables 1.7 to 1.9 or
SA Standard Drawing AB-036899. Layout and shoring for trenches not
greater than 1.2 m (4 ft) wide and not more than 2.4 m (8 ft) deep may be
as per Figure 1.16.
D. Timber used as cross braces or stringers (wales) for shoring shall not be
less than 10 cm x 10 cm (4 inches x 4 in ches) actual cross-section size.
Larger timber braces and stringers may be required, including for
excavations in soft or loose soils more than 1.2 m (4 ft) wide or more than
2.4 m (8 ft) deep. Refer to Tables 1.7 to 1.9 or SA Standard Drawing AB-
036899 for details.
E. The cross-section sizes of cross braces, stringers and uprights listed in
Tables 1.7 to 1.9 refer to minimum actual dimensions (not nominal
dimensions) of oak timber or equivalent with a bending strength of not less
than 850 psi. Use of nominal sizes is permitted only if: (1) all nominal size
timber is certified and permanently marked by the lumber mill and/or
supplier as being Douglas fir or equivalent with a bending strength of not
less than 1,500 psi, and (2) shoring layout is per Tables C4 to C6 of ANSI
A10.12 or Tables C-2.1 to C-2.3 of OSHA 1926, Subpart P, Appendix C,
“Timber Shoring for Trenches.”
F. Vertical spacing of cross braces and stringers (wales) down the sidewall of
the excavation shall not exceed 1.2 m (4 ft), unless a greater vertical
maintained to provide protection equal to or greater than the required
shoring, sloping or benching. The design for custom-made excavation
boxes or trench shields shall be reviewed by CSD before use.
C. Excavation boxes and trench shields shall be installed in accordance with
the manufacturer’s instructions and to restrict lateral or other movement of
the box or trench shield. Excavation boxes and trench shields shall be
capable of withstanding any sudden application of lateral loads.
D. Excavation boxes and trench shields shall be extended a minimum of 0.45
m (1.5 ft) above the excavation.
1.7.3 Hydraulic Shoring for Excavations
Hydraulic shoring can be used for protection against cave-ins in
excavations that do not exceed 6 m (20 ft) in depth (see Figures 1.12 and
1.13, and Tables 1.4 to 1.6).
1.7.4 Timber Shoring for Excavations (see Figure 1.14)
A. Timber shoring can be used as a method of protection against cave-ins in
excavations that do not exceed 6 m (20 ft) in depth.
B. Timbers shall be sound, free from large or loose knots and have proper
dimensions.
C. Timber shoring shall be designed in accordance with Tables 1.7 to 1.9 or
SA Standard Drawing AB-036899. Layout and shoring for trenches not
greater than 1.2 m (4 ft) wide and not more than 2.4 m (8 ft) deep may be
as per Figure 1.16.
D. Timber used as cross braces or stringers (wales) for shoring shall not be
less than 10 cm x 10 cm (4 inches x 4 in ches) actual cross-section size.
Larger timber braces and stringers may be required, including for
excavations in soft or loose soils more than 1.2 m (4 ft) wide or more than
2.4 m (8 ft) deep. Refer to Tables 1.7 to 1.9 or SA Standard Drawing AB-
036899 for details.
E. The cross-section sizes of cross braces, stringers and uprights listed in
Tables 1.7 to 1.9 refer to minimum actual dimensions (not nominal
dimensions) of oak timber or equivalent with a bending strength of not less
than 850 psi. Use of nominal sizes is permitted only if: (1) all nominal size
timber is certified and permanently marked by the lumber mill and/or
supplier as being Douglas fir or equivalent with a bending strength of not
less than 1,500 psi, and (2) shoring layout is per Tables C4 to C6 of ANSI
A10.12 or Tables C-2.1 to C-2.3 of OSHA 1926, Subpart P, Appendix C,
“Timber Shoring for Trenches.”
F. Vertical spacing of cross braces and stringers (wales) down the sidewall of
the excavation shall not exceed 1.2 m (4 ft), unless a greater vertical