TM-5-5420-279-10
1.2.11.1
Carry out further checks on arrival at the proposed location to ascertain the site suitability
for bridge deployment. Although not exhaustive, consider the following factors:
1.2.11.2
Access routes: - Tie in the access routes at both ends of the bridge where possible to
the existing main road network to reduce preparation and maintenance.
Banks: - Make sure both banks are of approximately equal height. Operations are
possible provided the difference in bank height does not exceed 9 ft 10 in (3 m) see site
reconnaissance. Refer to Figure 1. 9 to determine the difference in home and far bank
heights. The banks at the bearing areas of the bridge are to have a minimum soil bearing
types.
1.2.11.4
Chest Pack Bank Selection Matrix: - During bridge building operations, a bank condition
has to be selected via the chest pack. The matrices below give the appropriate selections
for deployment and final deployment.
Chest Pack selection
Bridge Configuration
Far Bank Height `H'
High
Level
Low
+1.5m to +2.0m
YES
2 Parallel + 2 Ramp Modules
+1.5m to 2.0m
YES
+2.0m to +2.5m
YES
3 Parallel + 2 Ramp Modules
+2.0m to 2.5m
YES
+2.5m to +3.0m
YES
4 Parallel + 2 Ramp Modules
+2.0m to +2.5m
YES
+2.0m to 3.0m
YES
+2.5m to +3.0m
YES
5 Parallel + 2 Ramp Modules
+2.0m to +2.5m
YES
+2.0m to 3.0m
YES
'AR' SPAN
