TM-5-5420-279-10
Nominal Far Bank
'AR' Span
Bridge Length
Nominal Home Bank Bearing
Bearing
Bridge length 'AR' span
65.6 to 72.17 ft
2.78 ft (0.85m)
78.41ft (23.9m)
(20m to22 m)
2.78ft (0.85m)
Bridge length 'AR' span
72.17 to 91.86 ft
97.76ft (29.8m)
2.78 ft (0.85m)
(22m to28 m)
2.78ft (0.85m)
Bridge length 'AR' span
91.86 to 111.54 ft
2.78 ft (0.85m)
117.45ft (35.8m)
(28m to 34m)
2.78ft (0.85m)
Bridge length 'AR' span
111.54 to 131.23 ft
136.81ft (41.7m)
2.78 ft (0.85m)
(34m to 40 m)
2.78ft (0.85m)
e.g. The 'AR' span = 124.67 ft (38 m).
Therefore nominal home bank bearing = 136.81ft - 124.67ft -2.78ft = 9.36 (41.7 38 - 0.85 = 2.85m)
NOTE
If the home bank slope is less than level and the home bank bearing is greater than 0.85m then
site preparation is required.
Setting of Stabilizer Leg Height Prior to Build
1.2.7.1
These pin hole positions are irrespective of bridge configuration or ground conditions.
Table 1. 8 A-frame Stabilizer Hole Position (Bank Slopes 1:20)
Far Bank Height `H'
Stabilizer Hole Position
Feet
Meters
+3.28 to +9.84
+1 m to +3 m
Hole 14 or above
+3.28 to -3.28
+1 m to 1 m
Hole 10
+3.28 to -9.84
-1 m to 3 m
Hole 6 or below
Table 1. 9 A-frame Stabilizer Hole Position Home bank slope
+1:20 to
+1:10
Far Bank Height `H'
Stabilizer Hole Position
Feet
Meters
+2.3 to 2.3
+0.7 to 0.7
Hole 6 or below
Table 1. 10 A-frame Stabilizer Hole Position Home bank slope
-1:20 to
-1:10
Far Bank Height `H'
Stabilizer Hole Position
Feet
Meters
Hole 141/2 or above
+2.3 to 2.3
+0.7 to 0.7