VALTIR QuadGuard User manual
�/LTIR
QuadGuard®
CRASH CUSHION
ASSEMBLY MANUAL
PN 115348
QuadGuard®is a registered trademark of Valtir, LLC. Part No. 115348
© Valtir, LLC
Valtir.com 1 Revision D November 2022
QuadGuard®
The QuadGuard®system has been tested pursuant to National Cooperative Highway Research
Program (“NCHRP”) Report 350 specifications. The QuadGuard®system has been deemed eligible
for federal-aid reimbursement on the National Highway System by the Federal Highway
Administration (“FHWA”).
Assembly Manual
15601 Dallas Parkway
Suite 525
Addison, Texas 75001
Warning: The local highway authority, distributors, owners, contractors,
lessors, and lessees are RESPONSIBLE for the assembly, maintenance, and
repair of the QuadGuard®. Failure to fulfill these RESPONSIBILITIES with
respect to the assembly, maintenance, and repair of the QuadGuard®could
result in serious injury or death.
Important: These instructions are for standard assembly specified by the
appropriate highway authority. In the event the specified system assembly,
maintenance, or repair would result in a deviation from these assembly
instructions, contact the appropriate highway authority engineer.
This manual must be available to the worker overseeing and/or assembling the product at
all times. For additional copies, contact Valtir directly at (888) 323-6374 or visit Valtir.com.
The instructions contained in this manual supersede all previous information and manuals. All
information, illustrations, and specifications in this manual are based on the latest QuadGuard®
information available to Valtir at the time of printing. We reserve the right to make changes at any
time. Please contact Valtir to confirm that you are referring to the most current instructions.
Valtir.com 2 Revision D November 2022
Table of Contents
Customer Service Contacts ..........................................................................................................3
Important Introductory Notes ........................................................................................................3
Safety Symbols .............................................................................................................................4
Safety Rules for Assembly............................................................................................................4
Limitations and Warnings..............................................................................................................5
System Overview ..........................................................................................................................6
Inspect Shipping......................................................................................................................6
System Components...............................................................................................................7
Foundation/Anchoring.................................................................................................................11
Valtir Approved Adhesive Anchoring System .............................................................................12
Vertical Assemblies...............................................................................................................12
Assembly Cautions ...............................................................................................................13
Horizontal Assemblies...........................................................................................................14
Recommended Tools.................................................................................................................. 15
How to Determine Left/Right ................................................................................................. 16
System Bay Count ................................................................................................................16
Measuring the Width .............................................................................................................17
Site Preparation/Foundation .......................................................................................................18
Narrow System Identification ......................................................................................................19
Inspect Shipping....................................................................................................................20
Determine Backup and Transition Type................................................................................20
Narrow Transitions ................................................................................................................ 21
Assembly Narrow........................................................................................................................22
Monorail Alignment ...............................................................................................................23
Attach Nose...........................................................................................................................33
Wide System Identification..........................................................................................................39
Inspect Shipping....................................................................................................................40
Determine Backup and Transition Type................................................................................40
Wide Transitions ...................................................................................................................41
Assembly Wide ...........................................................................................................................42
Monorail Alignment ...............................................................................................................43
QuadGuard®Final Inspection Checklist......................................................................................57
Maintenance and Repair.............................................................................................................58
Inspection Frequency............................................................................................................58
Visual Drive-By Inspection ....................................................................................................58
Walk-Up Inspection...............................................................................................................58
Post-Impact Instructions .............................................................................................................59
Parts Ordering Procedure ...........................................................................................................61
Valtir.com 3 Revision D November 2022
Customer Service Contacts
Valtir is committed to the highest level of customer service. Feedback regarding the QuadGuard®,
its assembly procedures, supporting documentation, and performance is always welcome.
Additional information can be obtained from the contact information below:
Valtir
Telephone:
(888) 323-6374 (USA)
(312) 467-6750 (International)
E-mail: Valtir.com/Contact
Internet: Valtir.com
Important Introductory Notes
Proper assembly of the QuadGuard®system is critical to achieve performance that has been
evaluated and deemed eligible by the FHWA per NCHRP Report 350. These instructions should
be read in their entirety and understood before assembling the QuadGuard®. These instructions
are to be used in conjunction with the assembly of QuadGuard®and are for standard assemblies
only as specified by the applicable highway authority. If you need additional information, or have
questions about the QuadGuard®, please contact the highway authority that has planned and
specified this assembly and, if needed, contact Valtir Customer Service. This product must be
assembled in the location specified by the appropriate highway authority. If there are deviations,
alterations, or departures from the assembly instructions specified in this manual, the device may
not perform as tested.
Important:DO NOT use any component part that has not been specifically
specified herein for the QuadGuard®during assembly or repair.
This product has been specified for use by the appropriate highway authority and has been
provided to that user who has unique knowledge of how this system is to be assembled. No
person should be permitted to assist in the assembly, maintenance, or repair of this system that
does not possess the unique knowledge described herein. These instructions are intended for an
individual qualified to both read and accurately interpret them as written. These instructions are
intended only for an individual experienced and skilled in the assembly of highway products that
are specified and selected by the highway authority.
A manufacturer’s drawing package will be supplied by Valtir upon request. Each system will be
supplied with a specific drawing package unique to that system. Such drawings take precedence
over information in this manual and shall be studied thoroughly by a qualified individual who is
skilled in interpreting them before the start of any product assembly.
Valtir.com 4 Revision D November 2022
Safety Symbols
This section describes the safety symbols that appear in this QuadGuard®manual. Read the
manual for complete safety and assembly information.
Symbol Meaning
Safety Alert Symbol: Indicates Important, Caution, Warning, or Danger. Failure
to read and follow the Important, Caution, Warning, or Danger indicators could
result in serious injury or death to the workers and/or bystanders.
Warning:Read safety instructions thoroughly and follow the assembly directions
and suggested safe practices before assembling, maintaining, or repairing the
QuadGuard®. It is the responsibility of the installer to follow the instruction
contained in this manual. Failure to comply with these warnings could result in
increased risk of serious injury or death in the event of a vehicle impact with a
system.
Important:Please keep up-to-date instructions for later use and reference by
anyone involved in the assembly of the product.
Safety Rules for Assembly
* Important Safety Instructions *
This manual must be kept in a location where it is readily available to persons who are skilled and
experienced in the assembly, maintenance, or repair of the QuadGuard®. Additional copies of this
manual are available from Valtir by calling (888) 323-6374, or by visiting Valtir.com/Contact.
Please contact Valtir if you have any questions concerning the information in this manual or the
QuadGuard®.
It is the responsibility of the installer to use appropriate safety precautions when operating power
equipment, mixing chemicals, and when moving heavy equipment or QuadGuard®components.
Safety articles including but not necessarily limited to work gloves, eye protection, safety-toe
shoes, and back protection should be used.
Warning: It is the responsibility of the installer to use all safety measures
incorporating appropriate traffic control devices specified by the highway authority.
These measures must be used to protect all personnel while at the assembly,
maintenance, or repair site.
Warning:Failure to comply with these warnings could result in increased risk of
serious injury or death in the event of a vehicle impact with a system that has not
been accepted by the FHWA.
Warning: Use only Valtir parts on the QuadGuard®for assembly, maintenance,
or repair. The use of component parts not specified herein is strictly prohibited.
The QuadGuard®assembled with Valtir Parts has been tested, approved, and
accepted for state use by the FHWA. A QuadGuard®using parts other than those
specified herein has not been tested, approved, or accepted for state use by the
FHWA. Failure to follow this warning could result in increased risk of serious injury
or death in the event of a vehicle impact.
Valtir.com 5 Revision D November 2022
Limitations and Warnings
Valtir contracts with FHWA approved testing facilities to perform crash tests, evaluate test results,
and submit results to the FHWA for review.
The QuadGuard®system has been deemed eligible for reimbursement by FHWA as meeting the
requirements and guidelines of NCHRP Report 350. NCHRP Report 350 tests are designed to
evaluate product performance involving a range of vehicles on roadways, from lightweight cars
(approx. 1800 lb. [820 kg]) to full size pickup trucks (approx. 4400 lb. [2000 kg]). A product can
be certified for multiple Test Levels. The QuadGuard®system is certified to the Test Level(s) as
shown below:
Test Level 2: 43 mph [70 kph]
Test Level 3: 62 mph [100 kph]
These FHWA directed tests are not intended to represent the performance of systems
when impacted by every vehicle type or every impact condition existing on the roadway.
This system is tested only to the test matrix criteria of NCHRP Report 350 as approved by
FHWA.
Valtir expressly disclaims any warranty or liability for injury or damage to persons or property
resulting from any impact, collision or harmful contact with products, other vehicles, or nearby
hazards or objects by any vehicle, object or person, whether or not the products were assembled
in consultation with Valtir or by third parties.
The QuadGuard®is intended to be assembled, delineated, and maintained within specific state
and federal guidelines. It is important for the highway authority specifying the use of a highway
product to select the most appropriate product configuration for its site specifications. The
customer should be careful to properly select, assemble, and maintain the product. Site lay out,
vehicle population type; speed, traffic direction, and visibility are important elements that require
evaluation in the selection of a highway product. For example, curbs could cause an untested
effect on an impacting vehicle.
After an impact occurs, the debris from the impact should be removed from the area immediately
and the specified highway product should be evaluated and restored to its original specified
condition or replaced as the highway authority determines as soon as possible.
Important: It is the sole responsibility of the project engineer and/or the
local highway authority and its engineers to determine whether use or reuse
of any part of the system is appropriate or acceptable following an impact.
Valtir makes no recommendation or suggestion regarding this
determination.Each impact is unique.
Valtir.com 6 Revision D November 2022
System Overview
The QuadGuard®is a potentially reusable, re-directive, non-gating crash cushion for roadside
obstacles ranging in width from 24” to 126” (610 mm to 3200 mm). It consists of energy-absorbing
cartridges surrounded by a framework of Quad-Beam Panels.
Important: Valtir makes no recommendation whether use or reuse of any
part of the system is appropriate or acceptable following an impact. It is the
sole responsibility of the project engineer and/or the local highway authority
and its engineers to make that determination. It is critical that you inspect
this product after assembly is complete to make certain that the instructions
provided in this manual have been strictly followed.
The QuadGuard®utilizes two types of cartridges in a staged configuration designed to address
both lighter cars and heavier, high center-of-gravity vehicles. Its modular design allows the system
length to be tailored to the design speed and appropriate number of Bays for a site (p. 39).
Impact Performance
The 6 Bay QuadGuard®systems have successfully passed the requirements stipulated in NCHRP
Report 350, Test Level 3 tests with both the light car and pickup at speeds of up to 62 mph
[100 km/h] at angles up to 20 degrees.
During head-on impact testing, within NCHRP Report 350 criteria, the QuadGuard®is designed
to telescope rearward to absorb the energy of impact. When impacted from the side, within the
applicable NCHRP Report 350 criteria, it is designed to redirect the vehicle back toward its original
travel path and away from the roadside obstacle.
Warning: Do NOT modify the QuadGuard®in any way.
Warning: Ensure that the QuadGuard®system and delineation used meet all
federal, state, specifying agency, appropriate Manual on Uniform Traffic Control
Devices (“MUTCD”), and local specifications.
Warning: It is the responsibility of the installer to ensure that your assembly
procedure meets all appropriate Occupational Safety and Health Administration
(“OSHA”) and local standards.
Inspect Shipping
Before deploying the QuadGuard®, check the received parts against the shipping list supplied
with the system. Make sure all parts have been received.
Important:The Manufacturer’s Drawing Package supplied with the QuadGuard®
must be used with these instructions for proper assembly and should take
precedence over these general instructions.
Valtir.com 7 Revision D November 2022
System Components
Below is a list of system components to be used in the repair of your particular QuadGuard®
configuration. Please call Valtir customer support if you have any system questions (p. 3).
Warning: Use only Valtir parts that are specified herein for the QuadGuard®for
assembling, maintaining, or repairing the QuadGuard®. Do not utilize or
otherwise comingle parts from other systems even if those systems are
other Valtir systems. Such configurations have not been tested, nor have they
been deemed eligible for use. Assembly, maintenance, or repairs using
unspecified parts or accessories is strictly prohibited.
Note: Components are not shown to scale.
Narrow Diaphragm Assemblies *
Wide Diaphragm Assemblies *
625650 - 24”
625651 - 30”
625652 - 36”
606810 - 48”
607173 - 26.48”
607174 – 29.65”
607175 – 32.78”
607176 – 35.93”
607177 – 39.08”
607145 – 42.23”
607146 – 45.38”
607148 – 48.53”
607149 – 50.11”
607150 – 51.68”
607151 – 54.83”
607152 – 57.98”
607156 – 59.56”
607157 – 61.13”
607158 – 64.28”
607159 – 68.06”
607160 – 70.58”
607162 – 73.73”
607163 – 76.88”
607164 – 80.04”
Nose, Narrow Plastic *
Nose, Wide Plastic *
Nose, Narrow Belt *
611547 - Yellow
611542 - Gray
611647 - Grey
611648 – Yellow
611538 – Grey
611539 – Yellow
*Parts in red are included in assemblies.
Valtir.com 8 Revision D November 2022
Nose, Wide Belt *
Cartridge Type I
Cartridge Type II
611541 - Yellow
611540 - Grey
606027 606029
Mushroom Washer
Flat Screw 5/8X8 1/2" Wide
Die Spring, 6”, Wide
617045
116879
117458
Flat Screw 5/8X5”,G8, Narrow
Die Spring, 1 1/2”, Narrow
Rail Nut, Hex, 5/8”
116878
117458
003340
Rail Bolt, 5/8X2”
Panel, Fender Assembly, QG
Bracket, Cart, Nose
003400
608236
605420
*Parts in red are included in assemblies.
Valtir.com 9 Revision D November 2022
Bolt, Hex, 5/8” X 2 1/2", G5
Bolt, Hex, 1/4" X 3/4", G5
Bracket, Cartridge Support
118232
113518
605446
Washer, Lock, 5/8”
Washer, Flat 3/8” X 1”
Nut, Hex, 3/8” X 1”
118100
118036
115960
Bolt, Hex, 3/8” X 1”,G5
Washer, Fender, 3/8” X 2”
Bolt, Hex, 5/8”X 1 1/2", G5
113596
118038
113654
Bracket, Pull-Out
Shim Kit, 1/8” X 3 5/8” X 8”(2)
Washer, Lock, 3/4"
605535
614050
118089
*Parts in red are included in assemblies.
Valtir.com 10 Revision D November 2022
Bolt, Hex, 3/4" X 2”, G8
Monorail Guide
Nut, Heavy Hex, 3/4"
113555
611368
003704
Nut, Heavy Hex, 5/8”
Hinge Plate, Fender Panel
Bolt, Hex, 5/8” X 4”, G5
003354
610172
113666
*Parts in red are included in assemblies.
Panel, Side, QG
Bracket, Cartridge Support
TS B/U
Locking Bar, Cartridge
Support
611898
605447
611266
Approved Adhesive *
Stud, 7”, G5
Washer, Flat, 3/4"
619316
117542
118027
*See Valtir Approved Adhesive Anchoring System section on page 12.
Valtir.com 11 Revision D November 2022
Foundation/Anchoring
Warning: It is the responsibility of the local DOT or appropriate highway authority
to ensure the assembly conforms to the AASHTO Roadside Design Guide.
Asphalt Installations
QuadGuard®Narrow systems with a Tension-Strut Backup may be temporarily installed in
construction zones on asphalt. Assemblies on Asphalt Concrete (“A.C.”) must provide a minimum
of 76 mm [3”] layer of asphalt over a minimum of 76 mm [3”] layer of Portland Cement Concrete
(“P.C.C.”), 152 mm [6”] layer of asphalt over 152 mm [6”] layer of subbase, or 203 mm [8”] layer
of asphalt with no subbase.
Important: Only 460 mm [18”] threaded rods, utilizing Valtir approved adhesive,
can be used with asphalt foundations. Contact Customer Service for a complete
list of approved adhesives (p. 3).
Concrete Installations
For concrete installations, the QuadGuard®should be installed only on an existing or freshly
placed and cured concrete base (28 MPa [4000 psi] minimum). Orientation of the concrete base
and the attenuator must comply with the project plans or as otherwise determined by the project
engineer or appropriate highway authority.
The QuadGuard®may be installed on any of the following foundations using the specified
anchorage:
Foundation A: Concrete Pad or Roadway
Foundation: 150 mm [6”] minimum depth P.C.C.
Anchorage: Approved adhesive with 180 mm [7”] studs 140 mm [5 1/2”] embedment
Foundation B: Asphalt over P.C.C.
Foundation: 76 mm [3”] minimum A.C. over 76 mm [3”] minimum P.C.C.
Anchorage: Length of anchor required is 460 mm [18”] 420 mm [16 1/2”] embedment
Foundation C: Asphalt over Compacted Subbase (“C.S.”)
Foundation: 150 mm [6"] minimum A.C. over 150 mm [6”] minimum C.S.
Anchorage: Approved adhesive with 460 mm [18"] studs 420 mm [16 1/2”] embedment
Foundation D: Asphalt Only
Foundation: 200 mm [8”] minimum A.C.
Anchorage: Approved adhesive with 460 mm [18”] studs - 420 mm [16 1/2”] embedment
Important: Systems mounted on asphalt must be replaced and mounted on
fresh, undisturbed asphalt if more than 10% of anchors are found to be loose,
broken, or show signs of pull out. If 10% or fewer anchors are damaged, replace
the damaged anchors in the existing asphalt. Anchor bolts used on systems
mounted on asphalt must be inspected every six months. See Post Impact
Instructions and Maintenance and Repair instructions on page 59 and 60.
Valtir.com 12 Revision D November 2022
Valtir Approved Adhesive Anchoring System
A Valtir approved adhesive anchoring system is required to securely anchor crash cushions. Each
approved adhesive kit contains adhesive, studs, nuts, washers and instructions. Both vertical and
horizontal assemblies are possible using an approved adhesive anchoring system.
Vertical Assemblies
Note: Read all Valtir approved adhesive instructions before starting.
1) Prepare the Concrete Foundation
Warning: Do not allow anchoring adhesive to contact skin or eyes. See material
safety data sheet supplied with adhesive kit for first-aid procedures. Use only in
well-ventilated area. Do not use near open flame.
Warning: Wear gloves and protective eyewear during application.
The anchor bolts (studs) that anchor the QuadGuard®Backup and/or Monorail sections to the
concrete foundation must be those shipped in the kit or of high strength steel (Grade B7 or
SAE-J429 Grade 5). These studs must be set in minimum 4000 psi [28 MPa] concrete. Allow
the concrete to cure a minimum of seven days before applying anchoring adhesive.
2) Drill Boreholes
Caution:It is the responsibility of the installer to consult OSHA silica
respiratory standard 29 CFR 1910.134 for debris removal from borehole(s)
and use Valtir approved adhesive to achieve optimum tensile strength. Do
not use diamond drill bits for drilling boreholes.
Use the Monorail(s) and Tension Strut Backup as drilling templates. Use a rotary hammer drill
to drill the boreholes 7/8” [22 mm] diameter to the recommended depth. See the approved
adhesive instructions provided with adhesive kit. Check to ensure each borehole is drilled to
the proper depth and aligned with the part to be anchored per table below.
Anchoring Information
Stud Size: Orientation Bit Size Minimum Depth Torque Medium
3/4”x 6 1/2"
Horizontal
7/8” [22 mm]
5 1/4” [133 mm]
Manufacturer Spec
Concrete
3/4”x 7"
Vertical
7/8” [22 mm]
5 3/4” [145 mm]
Manufacturer Spec
Concrete
3/4”x 18"
Vertical
7/8” [22 mm]
16 3/4” [425 mm]
10 ft-lb [15 N-m]
Asphalt
Important: When mounting on asphalt, initial torque shall be as shown in
the Anchoring Information table above. Due to the properties of asphalt,
anchors may loosen over time. For this reason Valtir recommends anchoring
to asphalt only at temporary locations. It is recommended to re-torque
anchors in asphalt every six (6) months to the proper initial torque specified.
Valtir.com 13 Revision D November 2022
3) Clean the Boreholes
Blow the concrete dust from the borehole using oil-free compressed air. Thoroughly brush it
with a 7/8” diameter steel bristle tube brush and then blow it out again. If the borehole is wet,
completely flush it with water while brushing and then blow it clean to remove all water using
oil-free compressed air.
Note: Use of the Valtir approved vacuum drilling equipment is authorized to replace the blowing
and brushing requirement of Step 3.
4) Apply Approved Adhesive
Fill the borehole 100% full.
Caution: Fill borehole 100% full so it is even with the pavement surface per
manufacturer’s instructions.
5) Add the Washers and Nuts
Place a flat washer onto the stud then thread a nut on until the end of
the stud is flush with the NUT (Figure 1).
6) Insert Studs in Boreholes and Wait for Adhesive to Cure
Push the stud, nut, and washer assembly down through the part and
into the borehole until the washer is seated against the part.
Caution:Do not disturb or load the stud until the approved
adhesive material has hardened per manufacturer
specifications.
7) Torque the Nuts
Once the adhesive has fully cured, torque the nut to the
manufacturer’s recommended specifications.
Assembly Cautions
1) Steel rebar
If steel rebar is encountered while drilling an anchor bolt borehole, apply one of the following
solutions:
A) Use a rebar drill bit for the rebar only and then switch back to the concrete bit to finish
drilling into the underlying concrete until the proper borehole depth is reached.
Caution:Do not drill through rebar without first obtaining permission to do so
from the project engineer.
B) Drill a new borehole down at an angle past the rebar to the proper depth. Anchor the
stud by completely filling both boreholes with an approved adhesive.
Figure 1
Vertical Application
(Before Applied Torque)
Valtir.com 14 Revision D November 2022
Horizontal Assemblies
The horizontal approved adhesive kit is the same as the vertical kit.
Caution: Fill borehole 100% full so it is even with the vertical concrete surface
per manufacturer’s instructions.
1) Follow the instructions supplied with your approved adhesive kit
Apply approved adhesive to each anchor per instructions.
2) Add the Washers and Nuts
Put washer and nut on stud so the nut is flush with end of stud.
3) Insert each Stud with Washer and Nut into Borehole
Push stud through part to be anchored and into borehole. Twist the stud in the approved
adhesive to wet the threads.
Important:The stud should be flush with the top of the nut in both vertical and
horizontal applications prior to tightening (Figure 2).
Caution:Do not disturb or load the stud until the approved adhesive material has
hardened (reference approved adhesive kit instructions for hardening times).
4) Torque the nuts
Once the adhesive has fully cured, torque nut(s) to the approved adhesive manufacturing
specification.
Figure 2
Horizontal Application
(Before Applied Torque)
Valtir.com 15 Revision D November 2022
Recommended Tools
Documentation
•Manufacturer’s Assembly Manual
•Manufacturer’s Drawing Package
Personal Protective Equipment
•Eye Protection
•Gloves
•Safety Toe Shoes
•Protective Clothing
Cutting Equipment
•Rotary Hammer Drill
•Rebar Cutting Bit
•Concrete Drill Bits – 22 mm [7/8”] (Double-Fluted)
•Grinder, Hacksaw or Torch (optional)
•Drill Bits 1/16” through 7/8”
Important: Valtir recommends using double-fluted drill bits to achieve optimum
tensile strength when applying an approved adhesive to the anchoring system
(p.12).
Hammers
•Sledgehammer
•Standard hammer
Wrenches
•Heavy Duty 1/2” drive impact wrench
•1/2" drive Sockets: 9/16", 11/16", 3/4", 15/16", 1 1/8", 1 1/4"
•1/2" drive Deep Well Sockets: 15/16", 1 1/4”
•1/2" drive Ratchet and Attachments
•1/2" drive Breaker Bar – 24” long
•1/2" drive Torque Wrench: 200 ft-lb
•Crescent Wrench: 300 mm [12”]
•Allen Wrench: 3/8”
Important: Because every impact is different, Valtir makes no
recommendation whether use or reuse of any part of the system is
appropriate or acceptable following an impact. It is the sole responsibility
of the project engineer and/or the local highway authority and its engineers
to make that determination. It is critical that you inspect this product after
assembly is complete to make certain that the instructions provided in this
manual have been strictly followed.
Valtir.com 16 Revision D November 2022
Miscellaneous
•Traffic Control Equipment
•Lifting and moving equipment (A lifting device is preferred although a forklift can be used.)
Minimum 5,000 lb. capacity required.
•Air Compressor (100 psi minimum) and Generator (5 kW)
•Long Pry Bar
•Drift Pin 12” [300 mm]
•Center Punch
•Tape Measure 25’ [7.5 m]
•Chalk Line
•Concrete Marking Pencil
•Steel bristled tube brush for cleaning 7/8” drilled boreholes
•Rags, water, and solvent for touch-up
Note: The above list of tools is a general recommendation and should not be considered
an exhaustive list. Depending on specific site conditions and the complexity of the
assembly specified by the appropriate highway authority the required tools may vary.
Decisions as to what tools are needed to perform the assembly properly are the
responsibility of the specifying highway authority and the authority’s selected contractor
performing the assembly of the system at the authority’s specified assembly site.
How to Determine Left/Right
To determine left from right when ordering parts, stand in front of the system facing the roadside
obstacle. Your left is the system’s left and your right is the system’s right.
System Bay Count
One Bay consists of one Cartridge, one Diaphragm, two Fender Panels, etc. The Nose section is
not considered a Bay, though there is a Cartridge in the Nose of each system. Note that this
means there will always be one more Cartridge in the system than the number of Bays in the
system. To determine number of Bays, count Fender Panels on one side (Figure 3). The Five-
Bay system is shown.
Figure 3 - Orientation
Valtir.com 17 Revision D November 2022
Measuring the Width
The QuadGuard®is available in five nominal widths:
•24” [610 mm]
•30” [760 mm]
•36” [915 mm]
•48” [1219 mm]
•69” [1755 mm]
•90” [2285 mm]
•126” [3200 mm]
The nominal width of a parallel system is the width of the diaphragm (Figure 4).
The nominal width of a wide system is the width at the location shown in Figure 5.
The outside width of the system is approximately 6” [150 mm] to 9” [230 mm] wider than the
nominal width. The width of the system is not the same as the width of the Backup.
Figure 5
Wide system
Figure 4
Parallel system
Valtir.com 18 Revision D November 2022
Site Preparation/Foundation
A QuadGuard®should be assembled only on an existing or freshly placed and cured concrete
base (4000 psi [28 MPa] minimum). Location and orientation of the concrete base and attenuator
must comply with project plans or as otherwise determined by the resident project engineer.
Recommended dimension and reinforcement specifications for new concrete foundations are
provided in Valtir concrete foundation drawings, supplied with the system. The system may be
assembled on a non-reinforced concrete roadway (minimum 8” [200 mm] thick). Deployment
cross-slope shall not exceed 8% and should not twist more than 2% over the length of the system;
the foundation surface shall have a light broom finish.
Caution: Accurate placement of all steel rebar is critical to avoid interference
with the concrete anchor bolts.
Warning: Location of the Backup in relation to nearby objects will affect the
operation of the attenuator. Upon impact, the Fender Panels telescope rearward
and extend beyond the rigid Backup as much as 30” [760 mm]. Position the Backup
so that the rear ends of the last Fender Panels are a minimum of 30” [760 mm]
forward of objects that would otherwise interfere with movement of the rearmost
Fender Panels. Failure to comply with this requirement will result in impaired
system performance offering motorists less protection and component damage.
Figure 6
Cross-Slope
Table of contents
