necessary since terrain, natural barriers, structures, or other passive
barrier features provide vehicle crash protection adjacent to the gate. In
such cases, the gate cable system can be terminated directly on each side of
the gate with the deadman concrete anchors described for the vehicle restraint
cable system in Section 2.
Reinforcement of Sliding and Vertical Lift Gates. While there is
no "generic" or standard solution for hardening the various configurations of
sliding and vertical lift gates that may be designed, the reinforcement
materials used for swing gates above may be used effectively by the designer
to reinforce either sliding or vertical lift gates.
For example, a 3/4-inch (19.1-mm) wire rope (cable) (MIL-W-83420)
could be attached along the length of a sliding gate as shown in Figure 27 or
a vertical lift gate as shown in Figure 28. The cable ends are then looped
securely around the gate frame uprights at each end as shown in Figure 29.
The end of the fence reinforcement cable system should be looped around the
terminal posts on each side of the gate opening as shown for gate posts for
swing gates in Figure 22. A 1/2-inch (12.7-mm) diameter welded steel alloy
chain conforming to RR-C-271 (Table 2, Type 1, Grade C, Class 1), can then be
passed around the fence terminal post and the gate frame upright, passing
through both the fence and gate cable loops as shown in Figures 29 and 30.
Again, all cable ends are looped and terminated with either three wire rope
clamps (MS16842) as shown in Figure 25 or hydraulically swaged wire rope
fittings (MIL-P-80104) as shown in Figure 26. A medium security padlock (MIL-
P-43951) is used to snugly fastened the chain together as shown in Figures 29