February 2021 |
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Product & Installation Manual: Sentry Barrier™
KEEPING
NZ SAFE
The minimum Length of Need (LON) of the
Sentry Barrier™ is dependent on the posted
speed limit. Please refer to Roading Controlling
Authority approval letters for local minimum
length requirements. However a minimum
length of need for a two-way road with a posted
speed limit of 100 km/hr with a clear zone of
approaching traffic is recommend as 30 m,
excluding terminal ends.
The Sentry Barrier™ system’s rails and posts
are manufactured from hot-rolled steel flat
products in accordance with AS/NZS 1594
and hot-dip galvanised in accordance with AS/
NZS 4680 with an average minimum coating
thickness of 35 microns. All galvanising is
undertaken after fabrication is completed to
ensure no surfaces are left untreated.
The Sentry Barrier™ has been designed for
strength and resilience. Additional testing
was completed to show that the barrier can
withstand a second impact when already
damaged. With no repairs completed to the
barrier after a first test, it successfully resisted a
direct impact to the damaged region by a 1500
kg vehicle travelling at a nominal 70 km/h and
an impact angle of 25 degrees. The vehicle was
smoothly redirected with no additional damage
caused to the barrier.
Limitations and Warnings
The Sentry Barrier™ forms part of an approved
roadside protection system and it must be
installed in conjunction with an approved
terminal end system on both the approach and
trailing ends. When installed in accordance with
the manufacturer’s instruction the barrier system
allows an impacting vehicle to be re-directed in
a safe and predictable manner under the MASH
impact conditions.
Vehicle impacts that vary from the MASH impact
conditions for longitudinal barriers may result
in significantly different outcomes from those
obtained in the experimental testing and may
not meet the MASH evaluation criteria.
The selection and placement of the Sentry
Barrier must be in accordance with the Roading
Controlling Authority’s guidelines and the
details shown in the construction drawings.
Installation must be within strict accordance
with the installation instructions for the product.
Alternative installation techniques will be
required if the soil conditions on site do not
meet the minimum requirements stated in this
manual.
Training
All Installers must undergo formal training on
the installation of the Sentry Barrier™. This
includes the correct identification of each Sentry
Barrier™ components and installing it as per the
product specification and Installation Manual.
By the end of the training, installers will be
able to identify each component of the Sentry
Barrier™ and have the knowledge to safely
install the barrier as per the Installation Manual
and Specifications required.
The training will cover and include the correct
Personal Protective Equipment (PPE) required
to be worn during installation and maintenance.
Additionally by the end of the training, workers
will know the correct methods required to
handle and install all components of the Sentry
Barrier™.
