NOTE: Normally the bottom of fence fabric will be
installed no higher than 50.8 mm (2 inches) from the
ground. For Air Force projects, high security fence
fabric will be installed no higher than 25 mm (1
inch) from the ground. The height requirement for
fence fabric will be verified with the user. In
areas where the soil along the fence line is prone
to erosion, measures should be taken to maintain the
level of security for which the fence is designed.
Tension requirements are for high security fence
applications. Fabric fastening requirement of 305
mm (12 inch) spacing to top tension wire and bottom
rail is a high security fence requirement.
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Chain link fabric shall be installed on the side of the post indicated.
Fabric shall be attached to terminal posts with stretcher bars and tension
bands. Bands shall be spaced at approximately 381 mm (15 inch) 15 inch
intervals. The fabric shall be installed and pulled taut to provide a
smooth and uniform appearance free from sag, without permanently distorting
the fabric diamond or reducing the fabric height. Fabric shall be fastened
to line posts at approximately 381 mm (15 inch) 15 inch intervals and
fastened to all rails and tension wires at approximately [610] [305] mm
[24] [12] inch intervals. Fabric shall be cut by untwisting and removing
pickets. Splicing shall be accomplished by weaving a single picket into
the ends of the rolls to be joined. The bottom of the installed fabric
shall be [50] [25] mm plus or minus 13 mm [2] [1] plus or minus 1/2 inch
above the ground. For high security fence, after the fabric installation
is complete, the fabric shall be exercised by applying a 222 newtons (50
pound) 50 pound push-pull force at the center of the fabric between posts;
the use of a 133 newtons (30 pound) 30 pound pull at the center of the
panel shall cause fabric deflection of not more than 63.5 mm (2-1/2 inches)
2-1/2 inches when pulling fabric from the post side of the fence; every
second fence panel shall meet this requirement; all failed panels shall be
resecured and retested at the Contractor's expense.
3.8
BARBED WIRE SUPPORTING ARMS AND BARBED WIRE
3.8.1
General Requirements
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NOTE: Supporting arms for high security fence
applications will be securely anchored with rivets
to the line posts.
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Barbed wire supporting arms and barbed wire shall be installed as indicated
and as recommended by the manufacturer. Supporting arms shall be anchored
[to the posts in a manner to prevent easy removal with hand tools] [with
9.5 mm (3/8 inch) 3/8 inch diameter plain pin rivets or, at the
Contractor's option, with studs driven by low-velocity explosive-actuated
tools for steel, wrought iron, ductile iron, or malleable iron. Studs
driven by an explosive-actuated tool shall not be used with gray iron or
other material that can be fractured. A minimum of two studs per support
arm shall be used.] Barbed wire shall be pulled taut and attached to the
arms with clips or other means that will prevent easy removal.
SECTION 02821A
Page 15
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