November 2020 |
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11
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Product & Installation Manual: Sentry Barrier™ TL-4 Thrie-Beam System
KEEPING
NZ SAFE
Undulating Ground Conditions
Site specific grading may be necessary to
ensure that there are no ‘humps’ or ‘hollows’
that may significantly alter the impacting
vehicles stability or substantially alter the
Thrie-Beam heights in relation to the ground.
The Sentry Barrier™ TL-4 Thrie-Beam System
is required to be installed level and centred
on the barrier line as stated in the Installation
Procedure.
Care must be taken to ensure all posts in the
Sentry Barrier™ TL-4 Thrie-Beam System
are installed to the correct height, alignment
and orientation. It is strongly recommended
that smoothing of uneven ground conditions
be completed along the length of the Sentry
Barrier™ TL-4 Thrie-Beam System.
Clear Zone / Hazard Free Zone
Clear Zones are areas adjacent to traffic lanes
that provide errant vehicles the opportunity to
slow down or recover. The clear zone must be
kept clear from roadside features that could be
hazardous to errant vehicles, such as but not
limited to trees, poles and culverts. Although
it is desirable to maximize the available clear
zone, please refer to your local Road Controlling
Authority for confirmation of the minimum width
requirements.
Terminal Ends
The Sentry Barrier™ TL-4 Thrie-Beam System
is designed to be compatible with a range of
guardrail terminals ends or crash cushions
available, in accordance with designated
transition details. It is recommended that MAX-
Tension™ Terminal End be used with the Sentry
Barrier™ TL-4 Thrie-Beam System for optimal
performance. The X-350 Terminal End can also
be utilised if required. Refer to the Appendices
section for detailed drawings.
The purpose of the guardrail terminals ends,
or crash cushions is to provide a soft impact
and to prevent the end rail from spearing or
impacting the errant vehicle. The terminal ends
and crash cushions also provide tensile and
deflection strength necessary to ensure the
errant vehicle is redirected for the length-of-
need required.
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Care must be taken to ensure the correct
post spacing is ALWAYS used during the
installation.
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Care must be taken to ensure the posts are
orientated correctly during installation and to
ensure all Thrie-Beam bolts are inserted and
tightened accordingly.
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Care must be taken to ensure the line posts
are installed at the correct height.