TM 5-5420-209-12
exceeds 1 inch.
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
Paragraph
Page
2-29
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-129
2-30
Operation of Bridge in Icy and Snowy Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-129
2-31
Operation of Bridge in Rainy Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .2-130
Operation of Bridge in High Wind Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-130
2-32
2-33
Operation of Bridge in Hot and Dry Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-130
2-29. General. This section contains special instructions for bridge operations in unusual conditions. The standard
guidelines for bridge operation should be followed along with the following precautions for various weather conditions.
2-30. Operation of Bridge in Icy and Snowy Conditions. During bridge construction/operation/recovery,
follow all procedures for operation during normal conditions and the following special instructions:
a.
Remove any snow or ice from bridge equipment before it accumulates.
b. Continually check upstream side of bridge for ice buildup or ice flows.
c. Monitor river flow and adjust anchorage according.
Table 2-18. Conventional Rafting Capacities.
Rating Velocity (ft/sec)
Raft Size
0-3
4
5
6
7
8
9
10
25
15
10
0
0
3-bay
45
45
35
4-bay
60
60
60
55
40
3
15
0
5-bay
75
70
70
70
65
50
25
0
6-bay
75
70
70
70
70
55
30
0
(Track)
70
96
55
30
0
6-bay
96
96
96
(wheel)
Notes:
1.
2.
3.
Table shows load (MLC) capacity based on one vehicle positioned on the raft centerline and centered on the deck. The values
shown for centered on the deck. The values shown for 3-/4-/5- bay rafts apply for wheeled or tracked vehicles. The values shown shown
for a 6-bay raft apply for track/wheel vehicles as shown.
Ratings apply only with bottom of ramp ends raised 1 foot clear of water. Ramps raised for loading must be lowered before raft
is underway.
Raft commander must observe leading edge of raft and decrease speed or halt operations, as necessary
if water coming over bow
2-129
