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In the realm of chain link fencing, the structural integrity of a long-run
installation relies almost entirely on the tension wire system. While the mesh
and posts are visible components, it is the hidden network of tension wires that
prevents the fence from buckling, leaning, or collapsing under wind load. These
wires run horizontally through the top and bottom of the fence, threading
through tension bands and tie wires to create a rigid "fence line" effect.
Without a properly engineered tension system, even the heaviest gauge mesh will
eventually sag and deform, rendering the perimeter insecure and unsightly.
The top tension wire is the most critical element for maintaining vertical
alignment. It is typically a heavy-gauge steel wire (often 9 or 11 gauge) that
is pulled tight to act as a backbone for the fence. This wire is attached to
terminal posts using wire clips or by looping through special eyes, and then
stretched along the line of intermediate posts. To achieve the necessary
tightness, a come-along or wire stretcher is used to ratchet the wire to high
tension. This tension counteracts the natural tendency of the mesh to pull
inward or outward, ensuring that the fence remains straight over hundreds of
feet of distance.
At the bottom, the tension wire serves a dual purpose: structural bracing
and mesh security. It prevents the bottom of the fence from kicking out when
pressure is applied, such as someone leaning against it or snow drifting against
the base. More importantly, it secures the bottom edge of the chain link fabric
to the tension bands. This prevents "sausageing," a phenomenon where the mesh
bunches up between posts due to lack of horizontal support. In high-security
installations, the bottom wire is often placed inside a concrete footer or
attached to a rail to prevent intruders from lifting the mesh from
underneath.
Proper bracing is achieved through the use of tension bands, which are
metal straps that wrap around the fence posts. These bands have protruding hooks
or eyes that hold the tension wires in place. For long runs, the spacing of
these bands is crucial; they must be installed at every post to distribute the
load evenly. The wire is then threaded through these hooks and tightened. In
configurations involving changes of direction or corners, "fence stays" or
diagonal pull wires are added to transfer the load from the tension wire into
the ground or adjacent posts, preventing the corner post from snapping under
extreme tension.
The physics behind the tension system relies on the concept of the
"cantilever" and the neutral axis. By tensioning the wire, the installer creates
a pre-stressed structure that resists bending moments. However, over-tensioning
can be as dangerous as under-tensioning; excessive force can warp thin-walled
steel posts or pull terminal posts out of the ground. Therefore, the
installation must account for the type of soil, the depth of the post set, and
the expected wind load of the specific geographic location. In sandy or loose
soil, deeper post holes and additional concrete are required to anchor the
tension forces effectively.
Finally, maintenance of the tension wire system is vital for the longevity
of the fence. Over time, wires can loosen due to ground settling or thermal
expansion and contraction of the metal. Periodic checks are required to ensure
the come-alongs are still tight and that the wire clips have not slipped. If a
wire breaks, it must be replaced immediately, as the loss of tension on one
section places extra strain on the rest of the line. A well-maintained tension
wire system can extend the life of a chain link fence by decades, transforming a
flimsy mesh into a formidable, rigid barrier capable of withstanding the test of
time and elements.
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