Quantcast Vertical Lift Gates

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the gate must be borne by the gate post, design of the gate post and its
foundation is critical to assure proper support of the swing gate. An
undersized or improperly installed gate post may shift and cause the gate to
move out of plumb with the ground.  This may cause the gate to drag on the
ground or change elevation as the gate moves through its arc from the opened
to closed position.  Table 1 provides recommended concrete foundation
diameters for swing gate posts.  As a minimum for swing gate posts, the
concrete foundation should be 3 feet (1 m) deep.
Table 1.
Gate Post Foundations.
2.875 in (73 mm)
18 in (450 mm)
0 - 6 ft (0 - 1.8 m)
4.000 in (101.6 mm)
24 in (609.6 mm)
6 - 12 ft (1.8 - 3.7 m)
6.625 in (168.3 mm)
36 in (914.4 mm)
12 - 18 ft (3.7 - 5.5 m)
8.625 in (219 mm)
40 in (1016 mm)
18 - 24 ft (5.5 - 7.3 m)
Vertical Lift Gates.  Vertical lift ("guillotine") gates should
only be used when the gate location is mandated, the site is so restricted, or
the weather is so severe, that a gate must be placed in such a location where
the only way to open it is upward.  Vertical lift gates should never be
considered except as a last possible design choice.  When a vertical lift gate
is required, a counterweight with a continuous drive chain on each side (that
pulls the gate both up and down) must be specified.
Hinges.  The weight, size, and frequency of use are important
factors in the selection of gate hinges.  Specific design guidance is not
contained in the military specification or associated ASTMs.  Gate hinges must
have adequate strength to support the gate and have large bearing surfaces for
clamping them into position.  Commercial hinges manufactured to fit increasing
diameters of gate posts also have increased mass and capability to support
larger swing gates and generally will be found acceptable. The hinges must be
secured to the gate post and the gate frame to assure they will not twist or
turn under the weight and action of the gate.  Welding is recommended.  Gate
hardware must conform to RR-F-191/2.  ASTM F 900 may be used to supplement the
military  specification.  Hinges must be tamper-proof by the addition of welded
security plates or by reversing the direction of the hinge pins (one up, the
other down), thereby protecting the gate from being lifted off.  Bolts and
other hardware associated with gate hinges must be welded or peened to prevent
their removal by hand tools.
Locking System.  Gates will be provided with locking hardware
conforming to RR-F-191/2.  The locking system is designed to provide an equal
level of penetration resistance when a gate is closed and locked with an


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