Trinity Highway QuadGuard M Wide, Product Description Assembly Manual

Page: 16 / 64

TrinityHighway.com 15 Revision D March 2021
Site Preparation/Foundation
A QuadGuard ® M Wide, for permanent applications, should be assembled on an existing or freshly
placed and cured concrete base (28 MPa [4000 psi] minimum). Location and orientation of the
concrete base and attenuator must comply with project plans or as otherwise determined by the
local highway authority.
Recommended dimension and reinforcement specifications for new concrete foundations are
provided in Trinity Highway concrete foundation drawings, supplied with the system. The system
may also be assembled on reinforced or 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.
Warning: It is the responsibility of the installer to ensure proper site grading for
the QuadGuard ® M Wide placement as dictated by the state or specifying agency
pursuant to the AASHTO Roadside Design Guide.
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” [762 mm]. Position the Backup
so that the rear ends of the last Fender Panels are a minimum of 30” [762 mm]
forward of objects that would otherwise interfere with movement of the rearmost
Fender Panels. Failure to comply with this requirement is likely to result in system
performance which has not been crash tested pursuant to MASH criteria and may
also cause component damage which will necessitate maintenance or
replacement of the system.
Important:
QuadGuard ® M Wide cannot be mounted on asphalt.
Figure 8
Cross-Slope
8% (5 ○ ) (12:1)
MAXIMUM
LEVELING PAD
(SHOWN EXAGGERATED
FOR CLARITY)