ARMY TM 5-5420-212-10-1 MARINE CORPS TM 08676A-10/1-1 3-16 DOUBLE STORY 2E + 13 thru 2E + 22 BAY DESIGN w/o LRS The procedures that follow are for designs of DS 2E + 13 through 2E + 22 Bay MGBs (wo/LRS) on normal sites only where water level or any obstructions are at least 2.7 m below bank heights. a. Measure the AR Gap (para.. 3-10a) b. Select a bridge (para. 3-10b and Table 3-24) TABLE 3-24. DS MGB 2E + 13 through 2E + 22 bays (w/o LRS) AR Gap Ranges (a) MLC* (b) 2E + No. of Bays (c) Bridge Length L (d) R Distance (e) Nose Const (f) 28.3 - 30.9 60(T) 13 32.9 27.7 6N1 30.2 - 32.8 50 14 34.8 29.0 32.0 - 34.6 40 15 36.6 29.0 7N1 33.8 - 36.4 40 16 38.4 29.6 35.6- 38.2 30 17 40.2 29.6 8N1 37.5 - 40.1 30 18 42.1 29.6 8N1 39.3 - 41.9 24 19 43.9 35.1 6N1 41.1 - 43.7 24 20 45.7 38.7 + 43.0 - 45.6 20 21 47.6 38.7 3N2 44.8 - 47.4 16 22 49.4 40.5 * See step k. Slope Check and Table 1-1 for crossing restrictions. (T) = Tracked c. Bridge length Read and note the number of bays and bridge length, Table 3-24 columns (c) and (d). d. R Distance Read and note the R Distance, Table 3-24 column (e). e. Nose configuration Read and note the nose configuration, Table 3-24 column (f). f. Key construction points Identify, locate, and take elevations at the key construction points. These constructions points are explained below and shown in Figure 3-13. (1) F  Peg-Designates  the  location  of  the  far  bank  end  of  bridge  (outer  edge  of  bankseat  beam).  Initially placed 0.6 m (minimum acceptable) from the A peg on the far bank. This 0.6 m, between the A and F pegs is the amount of bridge that will bear on the far bank, and is known as the far bank bearing. (2) A Peg-Edge of firm ground on the far bank. 3-35