February 2021 |
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Product & Installation Manual: Sentry Barrier™
KEEPING
NZ SAFE
System Design and Design
Considerations
Kerbs
As with all road side safety hardware, the Sentry
Barrier™ has been designed and tested so that
the centre of gravity of the impacting vehicle is at
a constant height in relation to the system. For this
reason, it is preferred that kerbs or channels are
not in front or directly behind the Sentry Barrier™
as they may result in altering the height of the
vehicle at impact.
If interaction with a kerb cannot be avoided
consult the local Road Controlling Authority
guidelines regarding allowable kerb heights,
kerb shapes, and barrier offset distance.
Slopes
The Sentry Barrier™ can be installed on ground
with a maximum cross fall of 6H:1V. For steeper
slopes it is recommended that the system is
installed no closer than 300 mm to the batter
hinge point of the slope. If installations with less
clearance are required, please contact CSP
®
.
Batter Hinge Proximity
Sentry Barrier™ has been R & D crash tested
to MASH TL-3 when installed with nil offset to a
batter hinge point with a batter gradient of 2H:1V.
For a TL-3 containment level, the minimum
proximity to the hinge point shall be where the
back edge of the Sentry Post meets the Batter
Hinge Point as shown in the figure below.
As the proximity to the batter slope reduces
the soil support to the post, a 2100 mm long
Sentry Post is required. Installations in close
proximity to a batter hinge point should be
considered within the requirements of the Road
Controlling Authority Extended Design Domain
requirements.
