ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
Minimums
No of Bays
A to F
A’ to F’
13, 14, 16 thru 20
0.6m
1.4m
15
1.1 m
1.4 m
21
1.14 m
1.4 m
22
1.6 m
1.6 m
FIGURE 3-15. Site Profile DS 13-22 Bay with LRS
k.
Slope check.
(1)
Longitudinal. Ensure that the difference in elevation between the F’ (use elevation of CRB) and F peg
does not exceed 1/20 th of the total bridge length. If it does, either crib up, undertake a major construction project, or find
another centerline.
(2)
Transverse/Cross. Ensure that the transverse slope on both banks does not exceed 1/20 th of the bridge
width (4.0 m) for 13 - 20 bays at MLC 70(T) and 21 and 22 bays at MLC 60. No transverse slope is permitted for 21 and 22
bay at MLC 70(T) or any bridge at MLC 100(W).
I.
Calculate H and G
Calculate the far bank height (H) and the ground (at tail of bridge) clearance (G) for later comparison against N (nose lift)
and T (tail lift). The values of N, H, T and G are relative to a baseline drawn through the CRB and RRB.
H = Elev F + Elev RRB x (L - 0.5 m)
13.7 m
G = Elev O - Elev RRB x R distance
13.7 m
3-45
