ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1distance the bridge falls in front of the roller beam (0.23 m).X = (L + 0.23 m) - (AR Gap + 0.4 m)NOTETo adhere to minimum/maximum bearing rules without having to dig out or pack up under the endof bridge, you must ensure that the RB peg Is placed between 0.63 m and 2.33 m from the A’ peg.(b)Jack launch. The distance X to the RB peg is calculated by using the position of the A’ peg on thenear bank, bridge length (L), AR Gap, minimum bearing requirement (0.4 m), and the approximate distance requiredbehind the roller beam (0.23 m) to attach the jacks.X = (L - 0.23 m) - (AR Gap + 0.4 m)NOTETo adhere to minimum/maximum bearing rules without having to dig out or pack up under the endof bridge, you must ensure that the RB peg Is placed between 0.17 m and 1.87 m from the A’ peg.(7)O peg-Marks the clear distance behind the roller beam required to construct the bridge. It is positionedby measuring the R distance, Table 3-7 or 38, column (f), behind the RB pegg.Calculate BearingThe minimum and maximum bearings for all SS bridges are shown in the Table 3-9 and on Figures 3-7 and 3-8TABLE 3-9. BearingsBearingsNear BankFar BankMinimum0.4 m0.4 mMaximum2.1 m2.1 m(1)Push launch. To calculate the actual location of the F’ peg:X - 0.23 m = Near bank bearing(2)Jack launch. To calculate the actual location of the F’ peg:X + 0.23 m = Near bank bearingh.Check bearing(1)If the near bank bearing is within the minimum and maximum bearing limits, there is no need to shift theposition of the F and F’ pegs. The position will be as initially determined, F peg 0.4 m from A peg and the F’ peg will beplaced the distance determined as near bank bearing measured from the A’ peg.(2)If the near bank bearing is more than the maximum bearing allowable (2.1 m), it will be necessary toshift bearing.3-20
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