FM 5-212 Chptr 6 MGB Design Pro Forma

CHAPTER 6

MGB DESIGN PRO FORMA
(all measurements are in meters)

SS 4 Through 12 Bays

Grid _______________________________

Recon Officer ________________________

Map Ref ____________________________

Unit ____________MLC _______________

1. Measure AR gap A to A' ____________

NOTE: Use Tables 18 or 19 to obtain the answers to the following:

2. Select bridge ______________________

3. Bridge length ______________________

4. R distance ________________________

5. Nose construction __________________

6. Key construction points, dimensions, and elevations. Calculate the distance from the RB to the A' peg (X), where --

Push launch:

X = (bridge length + 0.23m) - (AR gap + 0.9m)

Jack launch:

X = (L - 0.23m) - (AR gap + 0.9m)

7. Slope check.

Ensure that the difference in elevation between the F' and F peg does not exceed one-tenth of the actual bridge length. If it does, you will have to crib up, undertake a major construction project, or find another centerline.

8. Calculate H:

9. Launch design:

10. Loads required.

From Table 20, determine the truck and trailer loads required for the bridge.

11. From Table 21, extract the following information:

Construction time __________________________

Manpower requirements _____________________

12. Final design:

Bays __________________________________

LNCG setting ___________________________

Packing required _________________________

Bearing: NB ___________FB _______________

Truck and trailer loads _____________________

Manpower required _______________________

Time to construct _________________________

DS 2E + 1 Through 2E + 12 Bays

Grid ____________Recon Officer ____________

Map Ref ________________________________

Unit ____________MLC___________________

1. Measure AR Gap A to A' ________________

NOTE: Use Table 22 to obtain the answers to the following:

2. Select bridge ____________________________

3. Bridge length ____________________________

4. R distance ______________________________

5. Nose construction ________________________

6. Key construction points, dimensions, and elevations (as shown below).

7. Slope check.

Ensure that the difference in elevation between the F and F' pegs does not exceed one-tenth of the total bridge length. If it does, you will have to crib up, undertake a major construction project, or find another centerline.

8. Calculate C, H, and G:

9. RULE 1. (If both bank heights > 0.6m, go to RULE 2.)

Choose an LNCG setting that ensures depth of C > depth of D.

LNCG settings permitted ______ ______ ______

10. RULE 2. LNCG setting to give N > H and T > G.

Choose an LNCG setting so that N > H.

LNCG setting chosen _______________________

NOTE: The setting chosen cannot be lower than that chosen in RULE 1.

11. RULE 3. Raise the FRB and RRB by 0.69m N RULE 3 = N RULE 2 + 0.69m N = ____

Check N Rule 3 > H -- Yes/No

Check T > G Yes/No -- column (p) T = ____

If Yes, design is OK.

12. RULE 4a. Lower RRB

N RULE 4a = N RULE 3 + answer to column (q). Check N > H

13. RULE 4b. Lower FRB

T RULE 4b = T RULE 3 + answer to column (r). Check T > G

14. Loads required.

From Table 23, determine the truck and trailer loads required for the bridge.

15. From Table 24, extract the following information:

Construction time _______________________

Manpower requirements __________________

16. Final design:

2E + ______________________________bays

LNCG setting _______________________

FRB setting _________________________

RRB setting _________________________

Bearing: NB __________FB ____________

Truck and trailer loads _________________

Manpower required ___________________

Time to construct _____________________

DS 2E + 13 Through 2E + 22 Bays Without LRS

(where water level or any obstructions are at least 2.7m below bank heights)

Grid _______________________

Recon Officer _______________

Map Ref ____________________

Unit ________________________

MLC _______________________

1. Measure AR gap A to A' _____________________

NOTE: Use Table 25 to obtain the answers to the following:

2. Select bridge. 2E + ______________________bays

3. Bridge length ______________________________

4. R distance ________________________________

5. Nose construction __________________________

6. Key construction points, dimensions, and elevations.

7. Slope check.

Ensure that the difference in elevation between the F' and F pegs does not exceed one-tenth of the total bridge length. If it does, you will have to crib up, undertake a major construction project, or find another site.

8. Calculate H and G:

9. RULE 1. LNCG setting to give N > H and T > G.

Choose an LNCG setting so that N > H.

LNCG setting chosen _______________

Then check if T > G

If N > H and/or T > G, go to RULE 2.

10. RULE 2. Raise the CRB and RRB by 0.253m

Check N > H -- Yes/No column (k)

Check T > G -- Yes/No column (l)

If Yes, design is OK.

11. RULE 3a. Lower RRB

N RULE 3a = N RULE 2 + answer to column (m) Check N > H

12. RULE 3b. Lower CRB

T RULE 3b = T RULE 2 + answer to column (n) Check T > G

13. Loads required.

From Table 26, determine the truck and trailer loads required for the bridge.

14. From Table 27, extract the following information:

Construction time ________________________

Manpower requirements __________________

15. Final design:

2E + ______________________________ bays

LNCG setting ___________________________

CRB setting _____________________________

RRB setting _____________________________

Bearing: NB _____________FB _____________

Truck and trailer loads _____________________

Manpower required _______________________

Time to construct _________________________

DS 2E + 13 Through 2E + 22 Bays With LRS

(where water level or any obstructions are at least 3.7m below bank heights)

Grid _______________________________

Recon Officer ________________________

Map Ref ____________________________

Unit ________________________________

MLC _______________________________

1. Measure AR gap A to A' _________________

NOTE: Use Table 28 to obtain the answers to the following:

2. Select a bridge _________________________

3. Bridge length __________________________

4. R distance ____________________________

5. Nose construction ______________________

6. Key construction points, dimensions, and elevations.

7. Slope check.

Ensure that the difference in elevation between the F' and F peg does not exceed one-twentieth of the total bridge length. If it does, you will have to crib up, undertake a major construction project, or find another centerline.

8. Calculate H and G