ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
f.
Wind Speed
The wind speed permitted for each bridge length is given below. The bridge will require lateral anchorage before
crossing vehicles when wind speed exceeds those given in Table 3-5.
TABLE 3-5 Maximum wind speed v bridge length
2E + No.
22
21
20
19
18
17
16
15
14
13
of Bays
Bridge
ft
162
156
150
144
138
132
126
120
114
108
Length
m
49.4
47.6
45.7
43.9
42.1
40.2
38.4
36.6
34.8
32.9
Wind
mph
50
50
95
120
120
120
120
120
120
120
Speed
km/h
80.5
80.5
152.9
193.1
193.1
193.1
193.1
193.1
193.1
193.1
g.
Vehicle Access
An area large enough to allow the trucks and bolster trailers to completely turn around so that they can back into
the site, is required adjacent to the bridge site.
A vehicle park, covered and concealed, should be located from 0.3 to 3.1 miles (0.5 to 5 kms) behind the bridge
site, in which the trucks and trailers can be parked after off loading.
3-6
RECONNAISSANCE REPORT
a.
Before any attempt is made to begin installation of MGB, the unit that will construct the bridge should be
furnished a reconnaissance report. This report must contain the following information as a minimum. Minimum
information will be used to determine length and type of bridge.
(1)
Location of the site, map coordinates or specific directions from the base camp to the site.
(2)
Width of gap (AR Gap) on bridge centerline. The unit must know the AR Gap in order to plan the
mission, as the military load class (MLC) and the AR Gap will be applied to tables to determine the length and type of
bridge needed.
b.
If only the minimum information is provided, bridge unit personnel will have to conduct a reconnaissance to
obtain elevations, site conditions and other design related information.
3-7
CHOICE OF BRIDGE LENGTH AND CLASS
a.
Bridge Length. Use the AR gap from the reconnaissance report to find the length of bridge in Table 36. The
AR gap ranges have been computed for each bridge length, taking into account the minimum and maximum bearing for all
MGB’s.
b.
Bridge Class. The Military Load Class (MLC) is given in Table 36 for all bridge lengths and configurations.
3-14
