CSP Pacific SENTRY BARRIER User manual

February 2021 | Page 1Ph 0800 655 200 or visit www.csp.co.nz
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Roadside Workplace Roadwork Pedestrian Seeing Environment Telecoms
SENTRY BARRIER™
Longitudinal Barrier
Product and Installation Manual
Please call CSP®
on 0800 655 200 or visit
www.csp.co.nz for more information
February 2021
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February 2021 | Page 2Ph 0800 655 200 or visit www.csp.co.nz
Product & Installation Manual: Sentry Barrier™
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Table of contents
Introduction
System Overview
Limitations and Warnings
Training
Health and Safety
Before Installation
Safety statements
General Safety
Sentry Barrier™ Safety Statements
Limited Warranty
System Design and Design Considerations
Kerbs
Slopes
Batter Hinge Proximity
Weak Soil Installations
Posts on Base Plates
Horizontal and Vertical Curves
Undulating Ground Conditions
Clear Zone / Hazard Free Zone
Terminal Ends
Soil Condition
Length of Need
System Deection
Transitions
Parts Identication
Bill of Materials
Installation
Getting Started
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Preparation
Soil Conditions
Tools Required
Installation Tolerances
Installation Instructions
Site Preparation
Post Orientation with trafc ow direction
Post driver machine - Impact head
Construction of Terminal End or Crash Cushion
Installation Procedure (Posts and W-Beam)
Inspection and Maintenance Frequency
Maintenance requirement for repair after a Bushre
Installation Checklist for the Sentry Barrier™
Frequently Asked Questions
Appendices
Appendix A – Sentry Barrier™
Appendix B – Sentry Barrier™ Post
Appendix C – Sentry Barrier™ Washer
Appendix D – Installation Tolerance (Lateral)
Appendix E – Installation Tolerance (Vertical)
Appendix F – Sentry Barrier™ Transition to MAX-Tension™ End Terminal
Appendix G – Sentry Barrier™ Bolt Down Assembly
Appendix H - Sentry Barrier™ to Suit 2H:1V B. Slope & Weak Soil
Appendix I – Acceptable Post Deformation Measures & Tolerances
Test 1: Nut Pass-through
Test 2: Washer Fitment
Test 3: Post deformation bending and cracking tolerance
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CSP®may make changes to this Product Manual from time to time. Please check the CSP®
website prior to using this Product Manual to ensure that you have the latest version.

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Introduction
The Sentry Barrier™ is a roadside W-Beam
guardrail system suitable for containing,
redirecting and shielding vehicles from roadside
obstacles. The barrier has been designed and
tested to meet the evaluation criteria of MASH
Test Level 3 (TL-3) for a longitudinal barrier. This
is the current state of the art performance criteria,
exceeding the requirements of NCHRP 350 TL-3.
The Sentry Barrier™ has an initial installation
height of 800 mm to the top of the rail, providing
the system with the ability to withstand numerous
road surface overlays without the need to relevel
of lifting of the barrier. The Sentry Barrier™ can
be installed with an approved energy absorbing
terminal end on the approach end, however it
is recommended that an approved tangential or
ared MAX-Tension™ End Terminal be used for
optimal performance.
The rounded edges to the Sentry Barrier™ Post
and closed shape on the approach direction
provide increased protection for vulnerable
road users. The compact Sentry Barrier™ posts
are easy to drive into all soil types and provide
increased resistance to rotation in the soil when
impacted. Unlike other systems on the market,
any damage caused to the top of the posts or to
the rail mounting points during installation will not
affect the performance of the system.
The connection system between the rail and
posts is formed using conventional fasteners
providing it with the greatest tolerance of any
system on the market. If the connection is
damaged in any way it can be easily replaced
without replacing the posts allowing for simpler
installations and repairs. The Sentry Barrier™ is
installed quickly using conventional installation
tools and equipment.
System Overview
The Sentry Barrier™ is designed to provide
acceptable structural adequacy, minimal
occupant risk and safe vehicle trajectory as
required by the latest in safety standards,
AASHTO MASH 09 TL-3. This standard requires
the system to be independently evaluated with
full scaling testing using 1,100 kg and 2,270 kg
vehicles traveling at speeds of 100 km/hr and
impacting the system at an angle of 25 degrees.
The requirements of MASH 09 TL-3 are so
stringent that the system is required to absorb
more energy during the impact than the out-
dated NCHRP 350 standard TL-4.
When impacted by an errant vehicle, the Sentry
Barrier™ will redirect the vehicle along the face
of the barrier system, bringing it to a controlled
stop. The system has been developed to
produce no debris during an impact, with all
posts designed to remain rmly located in the soil
and the connection details to remain attached
to the rail. Repair of the system is completed by
removing and replacing any bent or damaged
W-Beam and posts impacted accordingly. Any
posts with damaged connections can be repaired
by replacing the connection hardware only,
reducing the need to remove posts and repair
damaged ground.
Key specications for the Sentry Barrier™ are:
System width 201 mm
Height to top of rail 800 mm
Height to top of post 790 mm
Post weight 13.7 kg
Post length 1.64 m
Post spacing 1.905 m
MASH TL3.10 dynamic deection 1.02 m
MASH TL3.11 dynamic deection 1.59 m

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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 trafc is recommend as 30 m,
excluding terminal ends.
The Sentry Barrier™ system’s rails and posts
are manufactured from hot-rolled steel at
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 rst 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 signicantly 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 identication of each Sentry
Barrier™ components and installing it as per the
product specication 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 Specications 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™.

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Health and Safety
Installers should comply with all necessary health
and safety legislation in the local jurisdiction,
including all safe work and lifting practices.
All appropriate trafc safety precautions must
be adopted. All workers must wear the required
safety clothing, including but not limited to, high
visibility vests, steel capped footwear, gloves and
protective glasses etc.
Before undertaking any earth works, including
drilling or driving of posts, always check with
the appropriate service providers that the area is
clear of underground services
All installers must be well clear of machinery
when posts are being driven.
Before Installation
Design, selection and placement of the Sentry
Barrier™ shall be in accordance with the local
Road Controlling Authority’s guidelines and
as per the details shown in the construction
drawings. Installation shall be in accordance
with the installation instructions supplied for this
product.
The Sentry Barrier™ is an engineered safety
device. Before starting installation ensure
familiarity with the makeup of the system.
Note: Soil conditions may require a local
geotechnical engineer to conrm the soil
condition on site met the required condition
described in the manual.
Safety statements
General Safety
>All required trafc safety precautions should
be complied with. All workers should wear
required safety clothing (examples, but not
limited to, include: high visibility vests, steel
capped footwear, gloves etc).
>Only authorised trained personnel should
operate any machinery. Where overhead
machinery is used, care must be taken to
avoid any overhead hazards.
>Before drilling or excavation always ensure
that the area is clear of underground services.
The appropriate service providers may need
to be contacted.
Sentry Barrier Safety Statements
>All installers must be a safe distance from all
drilling or excavating machinery operating.
>The components are not heavy enough to
require specialised lifting equipment, but
due to the dimensions and bulky nature,
care should be taken when lifting the larger
components into position.
>Avoid placing hands or ngers in and around
moving machine parts when components are
being lifted and manoeuvred into place.

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Limited Warranty
CSP Pacic (CSP) has tested the impact
performance of its barrier systems and crash
cushion systems, and other highway safety
hardware under controlled conditions, however,
CSP does not represent nor warrant that the
results of those controlled conditions would
necessarily avoid injury to persons or property.
TO THE MAXIMUM EXTENT PERMITTED
BY LAW, CSP EXPRESSLY DISCLAIMS
ANY WARRANTY OR LIABILITY FOR
CLAIMS ARISING BY REASONS OF DEATH
OR PERSONAL INJURY OR DAMAGE TO
PROPERTY RESULTING FROM ANY IMPACT,
COLLISION OR HARMFUL CONTACT WITH
THE PRODUCTS OR NEARBY HAZARDS OR
OBJECTS BY ANY VEHICLE, OBJECTS OR
PERSONS.
CSP warrants that any product or component part
manufactured by CSP will be free from defects in
material or workmanship. CSP will replace free of
cost any product or component part manufactured
by CSP that contains such a defect.
TO THE MAXIMUM EXTENT PERMITTED
BY LAW, CSP EXPRESSLY DISCLAIMS THE
FOREGOING WARRANTY IS IN LIEU OF AND
EXCLUDES ALL OTHER WARRANTIES NOT
EXPRESSLY SET FORTH HEREIN, WHETHER
EXPRESS OR IMPLIED BY OPERATION OF
LAW OR OTHERWISE, INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. CSP’S LIABILITY
UNDER THIS WARRANTY IS EXPRESSLY
LIMITED TO REPLACEMENT FREE OF
COST OF PARTS SUPPLIED BY CSP ONLY
(IN THE FORM AND UNDER THE TERMS
ORIGINALLY SHIPPED), OR TO REPAIR OR
TO MANUFACTURE BY CSP, PRODUCTS
OR PARTS NOT COMPLYING WITH CSP
SPECIFICATIONS, OR, AT CSP’S ELECTION, TO
THE REPAYMENT OF AN AMOUNT EQUAL TO
THE PURCHASE PRICE OF SUCH PRODUCTS
OR PARTS, WHETHER SUCH CLAIMS ARE FOR
BREACH OF WARRANTY OR NEGLIGENCE.
CSP SHALL NOT BE LIABLE FOR ANY
INCIDENTAL, CONSEQUENTIAL OR SPECIAL
LOSSES, DAMAGES OR EXPENSES OF ANY
KIND, INCLUDING, WITHOUT LIMITATION,
ANY SUCH LOSSES, DAMAGES OR EXPENSES
ARISING DIRECTLY OR INDIRECTLY FROM
THE SALE, HANDLING OR USE OF THE
PRODUCTS FROM ANY OTHER CAUSE
RELATING THERETO, OR FROM PERSONAL
INJURY OR LOSS OF PROFIT.
Any claim by the Buyer with reference to Products
sold hereunder for any cause shall be deemed
waived by the Buyer unless CSP is notied in
writing, in the case of defects apparent on visual
inspection, within ninety (90) days from the delivery
date, or, in the case of defects not apparent on
visual inspection, within twelve (12) months from
the said delivery date. Products claimed to be
defective may be returned prepaid to CSP’s plant
for inspection in accordance with return shipping
instructions that CSP shall furnish to the Buyer
forthwith upon receipt of the Buyer’s notice of claim.
If the claim is established, CSP will reimburse that
Buyer for all carriage costs incurred hereunder.
The forgoing warranty benets shall not apply to (i)
any Products that have been subject to improper
storage, accident, misuse or unauthorised
alterations, or that have not been installed,
operated and maintained in accordance with
approved procedures and (ii) any components
manufactured by the Buyer.
The customer acknowledges that it has acquired
the Goods for the purposes of a business and that
the Consumer Guarantees Act 1993 will not apply
to the supply of the Goods by CSP to it.

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Product & Installation Manual: Sentry Barrier™
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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 gure 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.

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Weak Soil Installations
Sentry Barrier™ has been R & D crash tested
to MASH TL-3 for installation in weak soil
in accordance with the AASHTO weak soil
classication. When installed in weak soil with
the 2100 mm long Sentry Post, the 1310 mm
embedment depth of the longer Sentry Post
is sufcient to support the system’s overall
performance in this scenario. See gure below.
The 2100mm long Sentry Posts are available from
CSP®for these applications. Installations in weak
soils should be considered within the requirements
of the Road Controlling Authority Extended Design
Domain requirements. Contact CSP®for any
further guidance and information if required.
Posts on Base Plates
In the event that the Sentry Barrier™ cannot be
installed to the required in-ground depth, the use
of a base plate mounted on a suitable foundation
can be adopted. Posts on base plates are
typically used at culvert locations, and in areas
where underground services restrict posts from
being driven into the ground. Refer to Appendix
G – SENTRY W-BEAM BARRIER BASE PLATE
OPTION. Contact CSP®for any further guidance
and information if required.

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Horizontal and Vertical Curves
The Sentry Barrier™ can accommodate both
horizontally and vertically curved guardrail
panels if required by site conditions. For radii
less than 25 m the system must be anchored
with an approved intermediate anchor or
terminal end. Please refer to approved details
of the local Road Controlling Authority where
necessary.
Undulating Ground Conditions
Site specic grading may be necessary to
ensure that there are no ‘humps’ or ‘hollows’
that may signicantly alter the impacting
vehicles stability or substantially alter the
W-Beam heights in relation to the ground. The
Sentry Barrier™ 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™ 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™.
Concave
corner
Convex
corner

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Clear Zone / Hazard Free Zone
Clear Zones are areas adjacent to trafc 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 an 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 conrmation of the minimum width
requirements.
Terminal Ends
The Sentry Barrier™ is designed to be
compatible with a range of w-beam guardrail
terminals ends or crash cushions available
in the public domain. It is recommended that
MAX-Tension™ End Terminal be used with the
Sentry Barrier for optimal performance. Refer to
Appendix F – Sentry Barrier™ TRANSITION TO
MAX-Tension™ End Terminal.
The purpose of the W-Beam 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 terminals
ends and crash cushions also provide tensile
and deection strength necessary to ensure the
errant vehicle is redirected for the length-of-
need required.
>Care must be taken to ensure the correct
post spacing is ALWAYS used during the
installation.
>Care must be taken to ensure the posts are
orientated correctly during installation and to
ensure all W-Beams bolts are inserted and
tightened accordingly.
>Care must be taken to ensure the line posts
are installed at the correct height.

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Soil Condition
The Sentry Barrier™ is a soil-mounted system
driven directly into the soil. Sentry Barrier™
posts should be installed in soil conditions
that meet AASHTO Grade B standard and
requirements set out by AS/NZS 3845:1999 and
TNZ Specication M/4 2006.
Soil conditions that do not meet these
requirements will require alternative installation.
Contact CSP®for details.
It is strongly recommended that soil tests be
completed at the location where the Sentry
Barrier is to be installed.
Note: All technical information required to
assist in designing a site specic foundation is
available from CSP®.
IF SOIL CONDITIONS ON SITE DO NOT MEET
OR EXCEED THE REQUIRED STRENGTH,
SITE SPECIFIC CONDITIONS, REFER TO A
LOCAL GEOTECHNICAL ENGINEER FOR
FURTHER ADVICE.
Length of Need
The minimum Length of Need (LoN) of the
Sentry Barrier™ is dependent on the specic
hazard being protected and the posted speed
limit. Please refer to Road Controlling Authority
approval letters for local minimum length
requirements.
The minimum length of need for a two-way road
with a posted speed limit of 100 km/hr with a
clear zone of approaching trafc is recommend
as 30 m plus the length of the terminal end
regions on either end of the barrier system.
We recommend Installers contact their local
Roading Control Authority for further information
or guidance.
Note: As per the LoN design section of the
Roading Control Authority’s guidelines, care
must be taken when calculating the actual
length of a barrier required verses the theoretical
length of need.

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System Deflection
The transverse deection of a barrier during
a crash is dependent upon the mass, speed,
and impact angle of the errant vehicle. The
maximum levels of dynamic deections
measured during impact testing are presented
below.
Crash testing typically represents the extremes
impact parameters. A review of the proposed
barrier location can be undertaken to assess
the following variables inuence on the likely
maximum system deection;
>Maximum attainable impact angle;
>Design speed; and
>Design vehicle.
Please refer to CSP®for assistance on
determining site specic deections based on
these parameters.
Transitions
A transition zone may be required to connect
the Sentry Barrier™ to other types of barriers
or non-approved terminal ends. Please contact
CSP®for guidance on acceptable transition
systems. Refer to Appendix F & Appendix G for
guidance.
The Sentry Barrier™ can be connected directly
to any approved proprietary or public domain
W-Beam terminal end with no transition zone.
For terminal ends with an installation height
less than 800 mm, the rst panel of the barrier
system shall be ramped to transition from
the terminal end height to the height of the
barrier. A maximum ramp angle of 5 degrees is
recommended.
Please contact CSP®for transitions requiring a
greater angle change.
Test 3-10 Test 3-11
Vehicle type Car Pick up
Vehicle mass 1,100 kg 2,270 kg
Vehicle speed 100 km/h 100 km/h
Impact angle 25° 25°
Dynamic deection 1.02 m 1.59 m

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Parts Identification
ALL STEEL COMPONENTS USED IN THE SENTRY BARRIER™ ARE HOT DIPPED GALVANISED
IN ACCORDANCE WITH AS/NZS 4680
Sentry Barrier™ Post (3 views)
Sentry Barrier™
Bolt, Washer & Nut
W-Beam Splice, Bolt & Nut

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Bill of Materials
Checklist per panel (3.81 m of barrier) installed Yes
2x Sentry Barrier™ Posts (per W-Beam)
2x Sentry Barrier™ Bolt, Washer and Nut (one per post connection)
1x W-Beam
8x Splice Bolts and Nuts (at the end of W-Beam and overlapping the prior W-Beam)
Drilling or compactor suitable for foundation
String line and pegs
Measuring tape
Level
32 mm Wrench
32 mm Ring Spanner

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Installation
Getting Started
The Sentry Barrier™ is a W-Beam barrier
designed to run the length of need required
and is attached to a compatible terminal end or
crash cushion. The minimum Length of Need
(LoN) allowed is dependent on the post speed
limit. For a 100 km/hr zone a minimum LoN
of 30 metres is recommended, excluding the
proposed terminal end or crash cushion.
Preparation
Before installing an Sentry Barrier™, ensure
that all components required for the system are
on site and have been identied. The Sentry
Barrier™ is an engineered safety device. Before
starting installation ensure familiarity with the
makeup of the system. Refer to the Bill of
Materials and Parts Identication sections in this
manual for more information.
Ensure that the area where the Sentry Barrier™
is to be installed is sufciently at so that the
posts and W-Beam can be installed within the
allowable tolerance and aligned to the terminal
ends or crash cushions. Minor site grading may
be required.
Soil Conditions
The Sentry Barrier™ has been designed to
withstand a constant static load, thermal
loading, and dynamic impact load that can be
applied from the impact of an errant vehicle.
To perform, the Sentry Barrier™ must be
attached to either a semi rigid or rigid terminal
end or crash cushion to provide the necessary
safety benets. It is recommended that the soil
tests are carried out at the location the Sentry
Barrier™ prior to being installed.
IF SOIL CONDITIONS ON SITE DO NOT MEET
OR EXCEED THE REQUIRED STRENGTH
DETAILED IN THIS MANUAL, SITE SPECIFIC
FOUNDATIONS MUST BE DESIGNED BY A
LOCAL GEOTECHNICAL ENGINEER.

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Tools Required
The tools required to install the Sentry Barrier™
are similar to other W-Beam barriers. It requires:
Appropriate personal protective equipment
Drilling or compactor machinery (suitable for
soil conditions and with a driving head to avoid
damage to posts during installation)
String line
Measuring tape
Level
32mm Socket wrench or Ratchet
32mm Ring spanner

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Installation Tolerances
The Sentry Barrier™ is an engineered safety
device. To obtain optimal performance is it
important to install all components of the
system to within the allowable tolerances stated
below (also in Appendix D and Appendix E).
Particular care must be taken to ensure;
>Suitable horizontal alignment and verticality
of the line posts.
>Consistency in the vertical height of the line
posts.
>Orientation and height of the terminal end or
crash cushion.
Sentry Barrier™ has to be installed at 790 mm
to the top of the post. A vertical height tolerance
of ±25 mm is acceptable for Sentry Barrier™
post. The top of the W-Beam is to be positioned
10 mm above the top of the Sentry Barrier™
post with a tolerance of ±5 mm. The Sentry
Barrier™ Post laterally is constrained to ±15 mm
tolerance. It is of upmost importance for these
tolerances to be adhered to in order to ensure
safe function of the Sentry Barrier™.

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Installation Instructions
Before installing the Sentry Barrier™, ensure
that all components required for the system
are on site and have been identied. The
Sentry Barrier™ is an engineered safety device
made up of relatively small number of parts.
Please ensure familiarity with the makeup of
the system and the installation process prior
to commencing. If required, refer to the Bill of
Materials and Parts Identication sections in this
manual for more information.
Site Preparation
It is preferred that the Sentry Barrier™ be
installed on at, level ground and tethered to an
approved terminal end or crash cushion. The
positioning of the Sentry Barrier™ commences
from the last post connected to the terminal
end or crash cushion, working upstream to
the prior terminal end or crash cushion. It is
recommended that a string line be used to
obtain the correct orientation and placement of
the posts and are aligned to the terminal end or
crash cushions.
Post Orientation with traffic flow direction
Ensure posts are correctly orientated in relation
to trafc ow direction by positioning the closed
side of the post towards oncoming trafc. Refer
to below.
BEFORE DRILLING OR EXCAVATION
ALWAYS ENSURE THAT THE AREA IS CLEAR
OF UNDERGROUND SERVICES.
Post driver machine - Impact head
Ensure a suitable post driver impact head that
has been designed to drive Sentry posts is
used in order to avoid damage to posts during
installation. Below are examples of suitably
designed impact heads. Contact CSP®for
assistance if required.
In cases where very hard ground conditions
are encountered, minor deformation may occur
near the top of the post. If it occurs, please
refer to Appendix I – ACCEPTABLE POST
DEFORMATION MEASURES & TOLERANCES,
to determine if the deformation is acceptable for
the continuation of installation.

February 2021 | Page 20Ph 0800 655 200 or visit www.csp.co.nz
Product & Installation Manual: Sentry Barrier™
KEEPING
NZ SAFE
Construction of Terminal End or Crash
Cushion
The Sentry Barrier™ is compatible with a
variety of terminal ends and crash cushions.
The selection of a suitable design will depend
primarily upon the soil type, and geometric
constraints of the site. Please refer to the
relevant terminal end or crash cushion
Installation Manual for guidance to the
construction and installation procedure of that
specic device.
Installation Procedure (Posts and W-Beam)
Step 1
Review the site location and identify possible
hazards prior to commencing the installation of
the Sentry Barrier™. Any concerns, please refer
to the local Roading Authority.
Step 2
Place a string line from the centre of the
downstream terminal end or crash cushion to
required location of the upstream terminal end.
The string line should pass over the centre of
each post location and be marked accordingly
as the required location for drilling or driving
each post.