Attachment 12
Table A12.1. Army Pier Length and Depths for Tiedowns.
Cohesive Soils
Pier Diameter
Pier Length
Unconfined Compressive Strength
Meters
Feet
Meters
Feet
[qu in kg/m2 [lb/ft2]
qu < 5,000 kg/m2
600 mm
2.0 ft
1,800 mm
6.0 ft
[qu < 1,000 lb/ft2]
5,000< qu <19,500 kg/m2
500 mm
1.5 ft
1,800 mm
6.0 ft
[1,000< qu <4,000 lb/ft2 ]
qu >18,500 kg/m2
500 mm
1.5 ft
1,200 mm
4.0 ft
[qu >4,000 lb/ft2]
Cohesionless Soils
Pier Diameter
Pier Length
Friction Angle ∅ in Degrees
Meters
Feet
Meters
Feet
∅ < 20
600 mm
2.0 ft
2,100 mm
7.0 ft
20 ≤ ∅ ≤ 30
600 mm
2.0 ft
1,800 mm
6.0 ft
∅ > 30
500 mm
1.5 ft
1,800 mm
6.0 ft
A12.3. Existing Mooring Points for Army. Existing mooring points will be tested for structural integrity
and strength as detailed in figure A12.2. If the existing mooring fails to meet the structural requirements
listed herein, replacement of the mooring structure is required.. If the existing mooring point has an
attached ground rod, its electrical resistance value must be measured. If it fails to meet resistivity
requirements, a new static ground rod is required.
A12.3.1. Evaluation of Existing Mooring Points for Structural Adequacy:
A12.3.1.1. Adequate Mooring Points. Existing 19 millimeter [0.750 inch] diameter bimetallic
copper covered steel rods, 1,800 millimeters [6 feet] long are considered adequate for immediate
aircraft protection provided the following conditions are met:
A12.3.1.1.1. The existing rods are installed in rigid pavement.
A12.3.1.1.2. The existing rods do not show signs of deformation or corrosion.
A12.3.1.1.3. The existing rods are inspected for deformation and corrosion at least once a year
and after each storm event with winds greater than 90 kilometers per hour [50 knots].
A12.3.1.2. Inadequate Mooring Points. At Army facilities, any existing rods that exhibit
deformation or corrosion will be considered inadequate and require replacement. All existing 19
millimeter [0.750 inch] diameter, 1,800 millimeter [6 foot] long rods in flexible (asphalt)
A12-12
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