Trench Rescue I
presented by the…presented by the…
Office of the State Fire Marshall of Office of the State Fire Marshall of IllinoisIllinois
Course Content
IntroductionIntroduction Trench Rescue HazardsTrench Rescue Hazards OSHA RegulationsOSHA Regulations Protective Systems Protective Systems Shoring System DesignShoring System Design Rescue ShoringRescue Shoring Trench Rescue OperationsTrench Rescue Operations
Shoring System Design Design criteriaDesign criteria
Soil classificationSoil classification Never consider soil better that Class-B for rescueNever consider soil better that Class-B for rescue
Trench dimensionsTrench dimensions EquipmentEquipment
Design specificationsDesign specifications OSHA chartsOSHA charts
Timber shoring chartsTimber shoring charts
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi.
** Manufactured members of equivalent strength may be substituted for wood.
TABLE C-1.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (ACTUAL) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3
5
UP TO
6 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 6 X 8 5 2 X 6
TO
UP TO
8 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 10 5 2 X 6
10
UP TO
10 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 10 X 10 5 2 X 6
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 2 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 2 X 6
15
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 10 5 10 X 12 5 2 X 6
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 8 X 10 5 3 X 6
TO
UP TO
8 8 X 8 8 X 8 8 X 8 8 X 8 8 X 10 5 10 X 12 5 3 X 6
20
UP TO
10 8 X 10 8 X 10 8 X 10 8 X 10 10 X 10 5 12 X 12 5 3 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Mixed oak or equivalent with a bending strength not less than 850 psi.
** Manufactured members of equivalent strength may be substituted for wood.
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi.
** Manufactured members of equivalent strength may be substituted for wood.
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi. CLASS-B Soil, Douglas fir, Rescue spacing (4’ max between crossbracdes)
** Manufactured members of equivalent strength may be substituted for wood. TRENCH DIMENSIONS: 5’ wide, 12’ deep
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi. CLASS-B Soil, Douglas fir, Rescue spacing (4’ max between crossbracdes)
** Manufactured members of equivalent strength may be substituted for wood. TRENCH DIMENSIONS: 5’ wide, 12’ deep
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi. CLASS-B Soil, Douglas fir, Rescue spacing (4’ max between crossbracdes)
** Manufactured members of equivalent strength may be substituted for wood. TRENCH DIMENSIONS: 5’ wide, 12’ deep
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi. CLASS-B Soil, Douglas fir, Rescue spacing (4’ max between crossbracdes)
** Manufactured members of equivalent strength may be substituted for wood. TRENCH DIMENSIONS: 5’ wide, 12’ deep
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi. CLASS-B Soil, Douglas fir, Rescue spacing (4’ max between crossbracdes)
** Manufactured members of equivalent strength may be substituted for wood. TRENCH DIMENSIONS: 5’ wide, 12’ deep
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi. CLASS-B Soil, Douglas fir, Rescue spacing (4’ max between crossbracdes)
** Manufactured members of equivalent strength may be substituted for wood. TRENCH DIMENSIONS: 5’ wide, 12’ deep
TABLE C-2.2
TIMBER TRENCH SHORING – MINIMUM TIMBER REQUIREMENTS *
SOIL TYPE B Pa = 45 X H + 72 psf (2 ft Surcharge)
SIZE (S4S) AND SPACING OF MEMBERS **
DEPTH CROSS BRACES WALES UPRIGHTS
OF HORIZ. WIDTH OF TRENCH (FEET) VERT. VERT. MAXIMUM ALLOWABLE HORIZONTAL SPACING
TRENCH SPACING UP TO UP TO UP TO UP TO UP TO SPACING SIZE SPACING (FEET)
(FEET) (FEET) 4 6 9 12 15 (FEET) (IN) (FEET) CLOSE 2 3 4 6
5
UP TO
6 4 X 6 4 X 6 4 X 6 6 X 6 6 X 6 5 6 X 8 5
3 X 12
4 X 8 4 X 12
TO
UP TO
8 4 X 6 4 X 6 6 X 6 6 X 6 6 X 6 5 8 X 8 5 3 X 8 4 X 8
10
UP TO
10 4 X 6 4 X 6 6 X 6 6 X 6 6 X 8 5 8 X 10 5 4 X 8
See
Note 1
10
UP TO
6 6 X 6 6 X 6 6 X 6 6 X 8 6 X 8 5 8 X 8 5 3 X 6 4 X 10
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 10 5 3 X 6 4 X 10
15
UP TO
10 6 X 8 6 X 8 8 X 8 8 X 8 8 X 8 5 10 X 12 5 3 X 6 4 X 10
See
Note 1
15
UP TO
6 6 X 8 6 X 8 6 X 8 6 X 8 8 X 8 5 8 X 10 5 4 X 6
TO
UP TO
8 6 X 8 6 X 8 6 X 8 8 X 8 8 X 8 5 10 X 12 5 4 X 6
20
UP TO
10 8 X 8 8 X 8 8 X 8 8 X 8 8 X 8 5 12 X 12 5 4 X 6
See
Note 1
OVER
20 SEE NOTE 1
* Douglas fir or equivalent with a bending strength not less than 1500 psi. CLASS-B Soil, Douglas fir, Rescue spacing (4’ max between crossbracdes)
** Manufactured members of equivalent strength may be substituted for wood. TRENCH DIMENSIONS: 5’ wide, 12’ deep
Shoring System Design Design criteriaDesign criteria
Soil classificationSoil classification Never consider soil better that Class-B for rescueNever consider soil better that Class-B for rescue
Trench dimensionsTrench dimensions EquipmentEquipment
Design specificationsDesign specifications OSHA chartsOSHA charts
Timber shoring chartsTimber shoring charts Hydraulic shoring chartsHydraulic shoring charts
TABLE D - 1.2ALUMINUM HYDRAULIC SHORING
VERTICAL SHORESFOR SOIL TYPE B
HYDRAULIC CYLINDERS
WIDTH OF TRENCH (FEET)
DEPTHOF
TRENCH
(FEET)
MAXIMUMHORIZONTAL
SPACING
(FEET)
MAXIMUMVERTICALSPACING
(FEET)
UP TO 8 OVER 8 UPTO 12
OVER 12 UPTO 15
OVER5
UP TO10
8
0VER10
UP TO15
6.5 4 2 INCHDIAMETER
2 INCHDIAMETER
NOTE (2)
3 INCHDIAMETER
OVER15
UP TO20
5.5
OVER 20 NOTE (1)
Footnotes to tables, and general notes on hydraulic shoring, are found in Appendix D, Item (g)Note (1): See Appendix D, Item (g) (1)Note (2): See Appendix D, Item (g) (2)
TABLE D - 1.3ALUMINUM HYDRAULIC SHORING
WALER SYSTEMSFOR SOIL TYPE B
WALES HYDRAULIC CYLINDERS TIMBER UPRIGHTS
DEPTH WIDTH OF TRENCH (FEET)MAX. HORIZ. SPACING
(ON CENTER)OF
TRENCHVERTICALSPACING
SECTION *MODULUS UP TO 8 OVER 8 UP TO 12 OVER 12 UP TO 15 SOLID 2 FT. 3 FT.
(FEET) (FEET) (IN3)HORIZ.
SPACINGCYLINDERDIAMETER
HORIZ.SPACING
CYLINDERDIAMETER
HORIZ.SPACING
CYLINDERDIAMETER
SHEET
OVER 3.5 8.0 2 IN 8.02 IN
NOTE(2) 8.0 3 IN5
UP TO 4 7.0 9.0 2 IN 9.02 IN
NOTE(2) 9.0 3 IN ------- ------- 3 x 1210
14.0 12.0 3 IN 12.0 3 IN 12.0 3 IN
OVER 3.5 6.0 2 IN 6.02 IN
NOTE(2) 6.0 3 IN
10UP TO 4 7.0 8.0 3 IN 8.0 3 IN 8.0 3 IN ------- 3 x 12 -------
1514.0 10.0 3 IN 10.0 3 IN 10.0 3 IN
OVER 3.5 5.5 2 IN 5.52 IN
NOTE(2) 5.5 3 IN15
UP TO 4 7.0 6.0 3 IN 6.0 3 IN 6.0 3 IN 3 x 12 ------- -------
2014.0 9.0 3 IN 9.0 3 IN 9.0 3 IN
OVER 20 NOTE (1)
Footnotes to tables, and general notes on hydraulic shoring, are found in Appendix D, Item (g)Notes (1): See Appendix D, item (g) (1)Notes (2): See Appendix D, item (g) (2)* Consult product manufacturer and/or qualified engineer for Section Modulus of available wales.
TABLE D - 1.2ALUMINUM HYDRAULIC SHORING
VERTICAL SHORESFOR SOIL TYPE B
HYDRAULIC CYLINDERS
WIDTH OF TRENCH (FEET)
DEPTHOF
TRENCH
(FEET)
MAXIMUMHORIZONTAL
SPACING
(FEET)
MAXIMUMVERTICALSPACING
(FEET)
UP TO 8 OVER 8 UPTO 12
OVER 12 UPTO 15
OVER5
UP TO10
8
0VER10
UP TO15
6.5 4 2 INCHDIAMETER
2 INCHDIAMETER
NOTE (2)
3 INCHDIAMETER
OVER15
UP TO20
5.5
OVER 20 NOTE (1)
Footnotes to tables, and general notes on hydraulic shoring, are found in Appendix D, Item (g) TRENCH DIMENSIONS: 5’ wide, 12’ deep
Note (1): See Appendix D, Item (g) (1)Note (2): See Appendix D, Item (g) (2)
TABLE D - 1.2ALUMINUM HYDRAULIC SHORING
VERTICAL SHORESFOR SOIL TYPE B
HYDRAULIC CYLINDERS
WIDTH OF TRENCH (FEET)
DEPTHOF
TRENCH
(FEET)
MAXIMUMHORIZONTAL
SPACING
(FEET)
MAXIMUMVERTICALSPACING
(FEET)
UP TO 8 OVER 8 UPTO 12
OVER 12 UPTO 15
OVER5
UP TO10
8
0VER10
UP TO15
6.5 4 2 INCHDIAMETER
2 INCHDIAMETER
NOTE (2)
3 INCHDIAMETER
OVER15
UP TO20
5.5
OVER 20 NOTE (1)
Footnotes to tables, and general notes on hydraulic shoring, are found in Appendix D, Item (g) TRENCH DIMENSIONS: 5’ wide, 12’ deep
Note (1): See Appendix D, Item (g) (1)Note (2): See Appendix D, Item (g) (2)
TABLE D - 1.2ALUMINUM HYDRAULIC SHORING
VERTICAL SHORESFOR SOIL TYPE B
HYDRAULIC CYLINDERS
WIDTH OF TRENCH (FEET)
DEPTHOF
TRENCH
(FEET)
MAXIMUMHORIZONTAL
SPACING
(FEET)
MAXIMUMVERTICALSPACING
(FEET)
UP TO 8 OVER 8 UPTO 12
OVER 12 UPTO 15
OVER5
UP TO10
8
0VER10
UP TO15
6.5 4 2 INCHDIAMETER
2 INCHDIAMETER
NOTE (2)
3 INCHDIAMETER
OVER15
UP TO20
5.5
OVER 20 NOTE (1)
Footnotes to tables, and general notes on hydraulic shoring, are found in Appendix D, Item (g) TRENCH DIMENSIONS: 5’ wide, 12’ deep
Note (1): See Appendix D, Item (g) (1)Note (2): See Appendix D, Item (g) (2)
TABLE D - 1.2ALUMINUM HYDRAULIC SHORING
VERTICAL SHORESFOR SOIL TYPE B
HYDRAULIC CYLINDERS
WIDTH OF TRENCH (FEET)
DEPTHOF
TRENCH
(FEET)
MAXIMUMHORIZONTAL
SPACING
(FEET)
MAXIMUMVERTICALSPACING
(FEET)
UP TO 8 OVER 8 UPTO 12
OVER 12 UPTO 15
OVER5
UP TO10
8
0VER10
UP TO15
6.5 4 2 INCHDIAMETER
2 INCHDIAMETER
NOTE (2)
3 INCHDIAMETER
OVER15
UP TO20
5.5
OVER 20 NOTE (1)
Footnotes to tables, and general notes on hydraulic shoring, are found in Appendix D, Item (g) TRENCH DIMENSIONS: 5’ wide, 12’ deep
Note (1): See Appendix D, Item (g) (1)Note (2): See Appendix D, Item (g) (2)
Appendix D to Subpart PItem (g)
Aluminum Hydraulic Shoring for Trenches
Item (g) Footnotes, and general notes, for Tables D-1.1, D-1.2, D-1.3, and D-1.4.
(1) For applications other than those listed in the tables, refer to § 1926.652 (c)(2) for use of manufacturer’s tabulated data. For trench depths in excess of 20 feet, refer to § 1926.652 (c)(2) and § 1926.652 (c)(3).
(2) 2 inch diameter cylinders, at this width, shall have structural steel tube (3.5 x 3.5 x 0.1875) oversleeves, or structural oversleeves of manufacturer’s specification, extending the full, collapsed length.
(3) Hydraulic cylinders capacities.(i) 2-inch cylinders shall be a minimum 2-inch inside diameter with a safe working capacity of not less than 18,000 pounds axial compressive load at
maximum extension. Maximum extension is to include full range of cylinder extensions as recommended by product manufacturer.(ii) 3-inch cylinders shall be a minimum 3-inch inside diameter with a safe working capacity of not less than 30,000 pounds axial compressive load at
maximum extension. Maximum extension is to include full range of cylinder extensions as recommended by product manufacturer.
(4) All spacing indicated is measured center to center
(5) Vertical shoring rails shall have a minimum section modulus of 0.40 inch.
(6) When vertical shores are used, there must be a minimum of three shores spaced equally, horizontally, in a group.
(7) Plywood shall be 1.125 in. thick softwood or 0.75 inch thick, 14 ply, arctic white birch (Finland form). Please not that plywood is not intended as a structural member, but only for prevention of local raveling (sloughing of the trench face) between shores.
(8) See appendix C for timber specifications.
(9) Wales are calculated for simple span conditions
(10) See appendix D, item (d) for basis and limitations of the data.
Appendix D to Subpart PItem (g)
Aluminum Hydraulic Shoring for Trenches
Item (g) Footnotes, and general notes, for Tables D-1.1, D-1.2, D-1.3, and D-1.4.
(1) For applications other than those listed in the tables, refer to § 1926.652 (c)(2) for use of manufacturer’s tabulated data. For trench depths in excess of 20 feet, refer to § 1926.652 (c)(2) and § 1926.652 (c)(3).
(2) 2 inch diameter cylinders, at this width, shall have structural steel tube (3.5 x 3.5 x 0.1875) oversleeves, or structural oversleeves of manufacturer’s specification, extending the full, collapsed length.
(3) Hydraulic cylinders capacities.(i) 2-inch cylinders shall be a minimum 2-inch inside diameter with a safe working capacity of not less than 18,000 pounds axial compressive load at
maximum extension. Maximum extension is to include full range of cylinder extensions as recommended by product manufacturer.(ii) 3-inch cylinders shall be a minimum 3-inch inside diameter with a safe working capacity of not less than 30,000 pounds axial compressive load at
maximum extension. Maximum extension is to include full range of cylinder extensions as recommended by product manufacturer.
(4) All spacing indicated is measured center to center
(5) Vertical shoring rails shall have a minimum section modulus of 0.40 inch.
(6) When vertical shores are used, there must be a minimum of three shores spaced equally, horizontally, in a group.
(7) Plywood shall be 1.125 in. thick softwood or 0.75 inch thick, 14 ply, arctic white birch (Finland form). Please not that plywood is not intended as a structural member, but only for prevention of local raveling (sloughing of the trench face) between shores.
(8) See appendix C for timber specifications.
(9) Wales are calculated for simple span conditions
(10) See appendix D, item (d) for basis and limitations of the data.
Shoring System Design Design criteriaDesign criteria
Soil classificationSoil classification Never consider soil better that Class-B for rescueNever consider soil better that Class-B for rescue
Trench dimensionsTrench dimensions EquipmentEquipment
Design specificationsDesign specifications OSHA chartsOSHA charts
Timber shoring chartsTimber shoring charts Hydraulic shoring chartsHydraulic shoring charts
Manufacturer’s tabulated dataManufacturer’s tabulated data
AIRSHORE SAFETY LIMIT TABLEC-1
FOR USE IN EXCAVATIONS SHORED IN ACCORDANCE WITHTHE DEPARTMENT OF LABOUR
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATIONCONSTRUCTION INDUSTRY STANDARD - SUBPART P OF PART 1926
SOILTYPE
DEPTHOF
TRENCH(Feet)
WIDTHOF
TRENCH(Feet)
MAXIMUMHORIZONTAL
SPACING(Feet)
MAXIMUMVERTICALSPACING
(Feet)Over 5 Up to 6 12 4Up to 10 6 to 12 6 4Over 10 Up to 6 12 4
A Up to 15 6 to 12 6 4Over 15 Up to 6 6 4
6 to 9 4.5 4Up to 20 9 to 12 4 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
B Up to 15 6 to 12 5 4Over 15 Up to 6 5 4
6 to 9 4 4Up to 20 9 to 12 3.5 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
C Up to 15 6 to 12 4 4Over 15 Up to 6 4 4
6 to 9 3 4Up to 20 9 to 12 2.75 4
USERS ARE ADVISED TO CHECK LOCAL SHORING AND SAFETY REQUIREMENTSOSHA REFERENCES
TIMBER REQUIREMENTS - MIXED OAK TABLES C-1.1, C-1.2, C-1.3SOIL CLASSIFICATIONS - Appendix A of Subpart P of Part 1926Shoring Configurations Deviating from this Table are not AllowedUnless in Accordance with the Requirements of Part 1926.652
AIRSHORE SAFETY LIMIT TABLEC-2
FOR USE IN EXCAVATIONS SHORED IN ACCORDANCE WITHTHE DEPARTMENT OF LABOUR
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATIONCONSTRUCTION INDUSTRY STANDARD - SUBPART P OF PART 1926
SOILTYPE
DEPTHOF
TRENCH(Feet)
WIDTHOF
TRENCH(Feet)
MAXIMUMHORIZONTAL
SPACING(Feet)
MAXIMUMVERTICALSPACING
(Feet)Over 5 Up to 6 12 4Up to 10 6 to 12 8 4Over 10 Up to 6 12 4
A Up to 15 6 to 12 8 4Over 15 Up to 6 8 4Up to 20 6 to 12 6 4Over 5 Up to 6 10 4Up to 10 6 to 12 8 4Over 10 Up to 6 6 4
B Up to 15 6 to 12 5 4Over 15 Up to 6 6 4
6 to 9 5 4Up to 20 9 to 12 4 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
C Up to 15 6 to 12 4 4Over 15 Up to 6 4 4Up to 20 6 to 12 3 4
USERS ARE ADVISED TO CHECK LOCAL SHORING AND SAFETY REQUIREMENTSOSHA REFERENCES
TIMBER REQUIREMENTS - DOUGLAS FIR Tables C-2.1, C-2.2, C-2.3SOIL CLASSIFICATIONS - Appendix A of Subpart P of Part 1926Shoring Configurations Deviating from this Table are not AllowedUnless in Accordance with the Requirements of Part 1926.652
AIRSHORE SAFETY LIMIT TABLEC-1
FOR USE IN EXCAVATIONS SHORED IN ACCORDANCE WITHTHE DEPARTMENT OF LABOUR
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATIONCONSTRUCTION INDUSTRY STANDARD - SUBPART P OF PART 1926
SOILTYPE
DEPTHOF
TRENCH(Feet)
WIDTHOF
TRENCH(Feet)
MAXIMUMHORIZONTAL
SPACING(Feet)
MAXIMUMVERTICALSPACING
(Feet)Over 5 Up to 6 12 4Up to 10 6 to 12 6 4Over 10 Up to 6 12 4
A Up to 15 6 to 12 6 4Over 15 Up to 6 6 4
6 to 9 4.5 4Up to 20 9 to 12 4 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
B Up to 15 6 to 12 5 4Over 15 Up to 6 5 4
6 to 9 4 4Up to 20 9 to 12 3.5 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
C Up to 15 6 to 12 4 4Over 15 Up to 6 4 4
6 to 9 3 4Up to 20 9 to 12 2.75 4
USERS ARE ADVISED TO CHECK LOCAL SHORING AND SAFETY REQUIREMENTSOSHA REFERENCES
TIMBER REQUIREMENTS - MIXED OAK TABLES C-1.1, C-1.2, C-1.3SOIL CLASSIFICATIONS - Appendix A of Subpart P of Part 1926Shoring Configurations Deviating from this Table are not AllowedUnless in Accordance with the Requirements of Part 1926.652
AIRSHORE SAFETY LIMIT TABLEC-1
FOR USE IN EXCAVATIONS SHORED IN ACCORDANCE WITHTHE DEPARTMENT OF LABOUR
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATIONCONSTRUCTION INDUSTRY STANDARD - SUBPART P OF PART 1926
SOILTYPE
DEPTHOF
TRENCH(Feet)
WIDTHOF
TRENCH(Feet)
MAXIMUMHORIZONTAL
SPACING(Feet)
MAXIMUMVERTICALSPACING
(Feet)Over 5 Up to 6 12 4Up to 10 6 to 12 6 4Over 10 Up to 6 12 4
A Up to 15 6 to 12 6 4Over 15 Up to 6 6 4
6 to 9 4.5 4Up to 20 9 to 12 4 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
B Up to 15 6 to 12 5 4Over 15 Up to 6 5 4
6 to 9 4 4Up to 20 9 to 12 3.5 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
C Up to 15 6 to 12 4 4Over 15 Up to 6 4 4
6 to 9 3 4Up to 20 9 to 12 2.75 4
USERS ARE ADVISED TO CHECK LOCAL SHORING AND SAFETY REQUIREMENTSOSHA REFERENCES
TIMBER REQUIREMENTS - MIXED OAK TABLES C-1.1, C-1.2, C-1.3SOIL CLASSIFICATIONS - Appendix A of Subpart P of Part 1926Shoring Configurations Deviating from this Table are not AllowedUnless in Accordance with the Requirements of Part 1926.652
AIRSHORE SAFETY LIMIT TABLEC-1
FOR USE IN EXCAVATIONS SHORED IN ACCORDANCE WITHTHE DEPARTMENT OF LABOUR
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATIONCONSTRUCTION INDUSTRY STANDARD - SUBPART P OF PART 1926
SOILTYPE
DEPTHOF
TRENCH(Feet)
WIDTHOF
TRENCH(Feet)
MAXIMUMHORIZONTAL
SPACING(Feet)
MAXIMUMVERTICALSPACING
(Feet)Over 5 Up to 6 12 4Up to 10 6 to 12 6 4Over 10 Up to 6 12 4
A Up to 15 6 to 12 6 4Over 15 Up to 6 6 4
6 to 9 4.5 4Up to 20 9 to 12 4 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
B Up to 15 6 to 12 5 4Over 15 Up to 6 5 4
6 to 9 4 4Up to 20 9 to 12 3.5 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
C Up to 15 6 to 12 4 4Over 15 Up to 6 4 4
6 to 9 3 4Up to 20 9 to 12 2.75 4
USERS ARE ADVISED TO CHECK LOCAL SHORING AND SAFETY REQUIREMENTSOSHA REFERENCES
TIMBER REQUIREMENTS - MIXED OAK TABLES C-1.1, C-1.2, C-1.3SOIL CLASSIFICATIONS - Appendix A of Subpart P of Part 1926Shoring Configurations Deviating from this Table are not AllowedUnless in Accordance with the Requirements of Part 1926.652
AIRSHORE SAFETY LIMIT TABLEC-1
FOR USE IN EXCAVATIONS SHORED IN ACCORDANCE WITHTHE DEPARTMENT OF LABOUR
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATIONCONSTRUCTION INDUSTRY STANDARD - SUBPART P OF PART 1926
SOILTYPE
DEPTHOF
TRENCH(Feet)
WIDTHOF
TRENCH(Feet)
MAXIMUMHORIZONTAL
SPACING(Feet)
MAXIMUMVERTICALSPACING
(Feet)Over 5 Up to 6 12 4Up to 10 6 to 12 6 4Over 10 Up to 6 12 4
A Up to 15 6 to 12 6 4Over 15 Up to 6 6 4
6 to 9 4.5 4Up to 20 9 to 12 4 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
B Up to 15 6 to 12 5 4Over 15 Up to 6 5 4
6 to 9 4 4Up to 20 9 to 12 3.5 4Over 5 Up to 6 8 4Up to 10 6 to 12 6 4Over 10 Up to 6 6 4
C Up to 15 6 to 12 4 4Over 15 Up to 6 4 4
6 to 9 3 4Up to 20 9 to 12 2.75 4
USERS ARE ADVISED TO CHECK LOCAL SHORING AND SAFETY REQUIREMENTSOSHA REFERENCES
TIMBER REQUIREMENTS - MIXED OAK TABLES C-1.1, C-1.2, C-1.3SOIL CLASSIFICATIONS - Appendix A of Subpart P of Part 1926Shoring Configurations Deviating from this Table are not AllowedUnless in Accordance with the Requirements of Part 1926.652
MULTISHORE SYSTEM - - - AIRSHORE INTERNATIONALFOR USE WITH ALL AIRSHORE SIZES AT MAXIMUM EXTENSION WITH MAXIMUM STRUT SPACING AS SPECIFIED ON THIS CHART
NO SURCHARGE HAS BEEN INCLUDED IN THE DEPTH CALCULATIONS.DEPTH OF SOIL TYPE TRENCH WIDTH UP TO A MAX. OF 6’ (1.8m) TRENCH WIDTH UP TO A MAX. OF 12’ (3.5m)TRENCH
FT (m)VERTICAL
FT (m)HORIZONTAL
FT (m)VERTICAL
FT (m)HORIZONTAL
FT (m)10’ (3m)
ORLESS
ABC
4’ (1.2)4’ (1.2)4’ (1.2)
8’ (2.4)8’ (2.4)6’ (1.8)
4’ (1.2)4’ (1.2)4’ (1.2)
8’ (2.4)8’ (2.4)6’ (1.8)
10’ (3m)TO
15’ (4.6)
ABC
4’ (1.2)4’ (1.2)4’ (1.2)
8’ (2.4)8’ (2.4)4’ (1.2)
4’ (1.2)4’ (1.2)4’ (1.2)
8’ (2.4)6’ (1.8)4’ (1.2)
15’ (4.6)TO
20’ (6.0)
ABC
4’ (1.2)4’ (1.2)4’ (1.2)
8’ (2.4)6’ (1.7)4’ (1.2)
4’ (1.2)4’ (1.2)4’ (1.2)
6’ (1.8)5’ (1.5)4’ (1.2)
SECTION 38.08 SHALL APPLY:THE SPECIFIED TRENCH DEPTH SHALL BE REDUCED IF EQUIPMENT OR OTHER HEAVY OBJECTS ARE LOCATED OR OPERATED CLOSE TO THEEDGE OF THE EXCAVATION (WITHIN THE SOIL FAILURE ZONE) OR IF THE EXCAVATIONS ARE ADJACENT TO OR ABUTTING BUILDINGS OR OTHERSTRUCTURES OR A HAZARD IS CREATEED BY VIBRATIONS FROM NEARBY EQUIPMENT OR FROM PASSING VEHICULAR TRAFFIC AND THEREVISED DEPTH SHALL BE SPECIFIED BY A PROFESSIONAL ENGINEER.
SOIL FAILURE ZONE:THE AREA ON EACH SIDE OF THE TRENCH EQUAL TO THE DEPTH OF THE TRENCH.
SECTION 38.06A (1) & (2) SHALL APPLY:THE SYSTEM SHALL EXTEND FROM AT LEAST 12 INCHES (30cm) ABOVE THE GROUND LEVEL TO OR CLOSE TOTHE BOTTOM OF THE TRENCH AS PERMITTED BY THE MATERIAL BEING INSTALLED IN THE TRENCH, BUT IN NO CASE MORE THAN 2FEET (61cm) FROM THE BOTTOM TRENCH.
SECTION 38.06A (8)(b)(8)(b) MEANS SHALL BE PROVIDED TO ENSURE THAT THE PNEUMATIC JACKS WILL NOT COLLAPSE IN THE EVENT OF LOSS OF INTERNALPRESSURE.
DRAWING PREPARED FOR THE PROVINCE OF BRITISH COLUMBIA
MULTISHORE SYSTEM
DATE: MARCH 4/96
FILE: 96500BC
PAGE: 2 OF 6
SUPPLIED/MANUFACTURED BY:
AIRSHORE INTERNATIONAL, LANGLEY B.C.UNIT #3 19695—92A AVENUE, LANGLEY B.C., VIM 3B3
PHONE: 604-882-8874 FAX: 604-882-3118ENGINEER
J.H. VINCENT SERVICESA DIVISION OF 509228 ONTARIO LIMITED
LONDON, ONTARIOPJONE: 519-472-9068
DATE:
MARCH 4/96
FILE NUMBER:
96500BC
PAGE:
1 OF 6
SOIL TYPE & SOIL PRESSURE
SOIL TYPE Ka w (PCF) Pa=PSF/FTTYPE ATYPE BTYPE C-60
0.2 0.34 0.48
135 130 125
27 44 60
“A” --- HARD & SOLID SOILS“B” --- SOILS LIKELY TO CRACK OR CRUMBLE“C” --- SOFT, SANDY, FILLED OR LOOSE SOILS
Shoring System Design Design criteriaDesign criteria
Soil classificationSoil classification Never consider soil better that Class-B for rescueNever consider soil better that Class-B for rescue
Trench dimensionsTrench dimensions EquipmentEquipment
Design specificationsDesign specifications OSHA chartsOSHA charts
Timber shoring chartsTimber shoring charts Hydraulic shoring chartsHydraulic shoring charts
Manufacturer’s tabulated dataManufacturer’s tabulated data Other tabulated dataOther tabulated data Custom engineeringCustom engineering