ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
bridge stronger. For example a double story bridge will carry MLC 70 (T) over a length of 102 ft (31.1 m) decreasing to
MLC 16 at 162 ft (49.4 m).
FIGURE 1-4. Link reinforced MGB.
d.
The Link Reinforcement Set (LRS) extends the single span capability of the MLC 70 MGB. The set contains
all the components needed for use with two bridge sets to construct any length of reinforced MLC 70 (T) MGB up to 150ft
(45.7 m) and MLC 60 (T) up to 16211 (49.4 m). The LAS consists of reinforcing links 12ft (3.66 m) and 6 ft (1.83 m) long
which are connected to form a pair of link chains, one beneath each bridge girder. The 6 ft (1.83 m) links are provided for
use in bridges that have an odd number of bays.
e.
Link reinforcement is added to the bridge during normal bridge construction. The size of the work party is
increased from 24 to 32 personnel and this permits addition of the LAS to the bridge without a considerable increase in
construction time. A capsill roller beam (CAB) is used when constructing 2E + 13 through 22 bay bridges with link
reinforcement. The end anchor and links are added to the bridge as the bottom panels pass the CAB. Additional
reinforcement is added as the bridge is boomed forward. When all reinforcement is in place, the bridge can be jacked
down. Before decking and ramping, the reinforcement is tensioned using the cable pullers.
f.
The link chains are connected to the bottom panels at the ends of the bridge by an anchor assembly,
positioned below the bridge girders by reinforcing posts which allow the system to be tensioned. The posts are pulled
towards a vertical position by cable pullers. The pullers are fitted to frames in which the top of the posts can slide, then the
posts are pinned at fixed points providing the correct tension. The amount of tension is the minimum needed to remove
slack from the bridge and reinforcement set.
WARNING
The MGB cannot be used when bridging requirements exceed the capabilities given in Table 1-1.
g.
Table 1-1 gives MGB’s specific capabilities, and Tables 1-2 1-3 and 1-4 give bridge lengths for 1-9 specified
gap widths.
1-9
