Posts, Top Rails, and Bracing. Top rails will not be specified or
allowed for fabrication of security fences. Required bracing for posts will
be accomplished with diagonal truss rods and tubular horizontal or diagonal
All posts and structural supports will be located on the inner
side of the fencing. Posts will be installed in concrete in accordance with
ASTM F 567. Posts must be vertical within plus or minus 2 degrees in two
planes. Each gate, terminal, and end post will be braced with truss rods.
Truss rods will be installed diagonally, from near ground level of a gate,
terminal, or end post to the top of the adjacent line post, no higher than 6
inches (152.4 mm) down from the top of the fabric. There will be no more than
a 50-degree angle between the truss rod and the ground.
Chain-Link Fence Fabric Mounting. Fence fabric will be mounted on
steel posts. Tension wires will either be interwoven or clipped along the top
and bottom row of fabric diamonds. The wire fabric will be secured to posts
and tension wires as specified in RR-F-191/4. When a more secure manner of
attaching the fabric to posts is desired, a power driven fabric and wire
fastener, depicted in Figure 1, may be used (see Appendix A). If the ties or
fasteners are coated or plated, the coating or plating must be
electrolytically compatible with the fence fabric to inhibit corrosion. Where
security fencing adjoins structures, the height of the fencing should be 12
feet (3.7 m) high from the connection point with a building to a point 12 feet
(3.7 m) away from the structure if required.
Fabric and Wire Fastener, Power Driven.