ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
TABLE 3-7. SS Bridges 4 through 8 bays
TABLE 3-8. SS Bridges 9 through 12 bays
Site and Bridge Dimensions
Site and Bridge Dimensions
AR Gap
No.
Brg
Nose
AR Gap
No.
Brg
Nose
of
of
Ranges
MLC*
Bays
Lgth
R Dist
Const
Ranges
MLC*
Bays
Lgth
R Dist
Const
(a)
(b)
(c)
(d)
(e)
(f)
(a)
(b)
(c)
(d)
(e)
(f)
3.7 - 7.1
70(T)
4
7.9
5.8
12.9 - 16.3
24
9
17.1
10.4
5N1
5.6 - 9.0
70(T)
5
9.8
6.7
14.7 - 18.1
20
10
18.9
12.2
5N1
7-4 - 10.8
40
6
11.6
7.6
LLN
16.5 - 19.9
16
11
20.7
12.2
6N1
9.2 - 12.6
30
7
13.4
9.5
ONLY
18.4 - 21.8
16
12
22.6
14.0
6N1
11.0 - 14.4
30
8
15.2
11.3
* - See step k. Slope Check and Table 1-1 forcrossing restrictions and MLC 100(W) capability. (T) = Tracked
c.
Bridge length
Read and note the number of bays and bridge length, Table 3-7 and 3-8 columns (c) and (d).
d.
R Distance
Read and note the R Distance, Table 3-7 and 3-8 column (e).
e.
Nose construction
Read and note the nose configuration, Table 3-7 and 3-8 column (f).
f.
Key construction points
Identify, locate, and take elevations at the key construction points. These construction points are explained below
and shown in Figures 3-7 and 3-8
(1)
F peg-Designates the location of the far bank end of bridge (outer edges of bankseat beam). Initially
placed 0.4m (minimum acceptable) from the A peg on the far bank. This 0.4m, 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)
A’ peg-Edge of firm ground on the near bank.
(4)
AR Gap-The distance measured between the A and A’ pegs. This is the actual gap to be spanned by
your bridge.
(5)
F’ peg-Designates the location of the near bank end of bridge (outer edge of bankseat beam). The
distance (determined later), from the A’to F' peg is the amount of bridge that will bear on the near bank, known as the near
bank bearing. The minimum acceptable near bank bearing is 0.4 m.
(6)
RB peg-Designates the position of the roller beam (RB). It may be in one of two different positions
depending upon the launch method used, push launch (4 or 5 bays) or jack launch (4 through 12 bays).
NOTE
Push launches are to be performed only when it Is operationaly necessary (see Chap. 5, Sect. I,
para. b). Push launches are no longer performed for training or demonstration purposes.
(a)
Push launch. The distance X to the RB peg is calculated by using the position of the A' peg on the
near bank, bridge length (L), AR Gap, minimum bearing requirement (0.4 m), and the approximate
3-19
