Release 08/21
High-Containment Roadside Safety Barrier
7
HIGHWAY
5.4 Installation in Rock, Asphalt or Concrete
Mowing Strips
The design of the Z-post differs from traditional posts in that
it relies on the yielding of the post by bending near ground
level rather than the yielding of the surrounding soil during a
vehicle impact. This makes the Z-post suitable for installation
in rock, asphalt or concrete mowing strips.
A traditional guardrail post is designed to absorb some crash
energy through post rotation in the soil prior to post failure.
Restraining these traditional posts by setting them in narrow
holes drilled into solid rock, by setting them in thick asphalt
layers or concrete, or by placing a mowing strip around the
posts can lead to a failure of the system to safely contain and
redirect the errant vehicle.
5.5 Manual Handling
Ezy-Guard HC uses fewer components than the public
domain guardrail systems. Z-posts weighing just 19.5kg are
lighter than traditional Thrie-beam C-posts. The lightweight
Z-post reduces manual lifting by installation crews.
The rounded edges of the Z-post provides a handlelike grip
when lifting, reducing the possibility of hand lacerations.
The Z-profile allows the installer to maintain a firm grip and
facilitates correct lifting techniques.
5.6 Locally Designed & Produced
Ezy-Guard HC is manufactured in Australia by Valmont
Highway using steel manufactured by BlueScope Steel.
Z-posts and rail are stamped providing traceability to
material mechanical and chemical analysis certificates. Hot
dip galvanising is performed internally by Ingal and daily
inspections ensure zinc thickness readings are in accordance
with AS/NZS standards.
5.7 Soft Ride-Down Decelerations
The Ezy-HC-Carriage controls the release of the Thrie-beam
rail from the Z-posts. This controlled release reduces the
potential for vehicle pocketing and provides a soft ridedown
for vehicle occupants.
High-Containment Roadside Safety Barrier
Summary of Contents for Ezy-Guard HC
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