Release 08/21
High-Containment Roadside Safety Barrier
8
HIGHWAY
6.0 performAnce
Ezy-Guard HC provides protection from roadside hazards located
close to the edge of the travelled way. The sectional strength of
the Z-post reduces lateral deflection whilst providing controlled
containment and redirection.
Crash testing guidelines provide a set of requirements that is
“worst practical conditions” in order to demonstrate the barriers
impact performance. When the combined effects of vehicle
mass, impact speed and angle of impact are considered, the
testing criteria represents the extremes of impact conditions to
be expected in realworld situations.
6.1 Deflection
The MASH TL3 deection for Ezy-Guard HC is 1.16m and the
MASH TL4 deection is 1.77m. The NCHRP-350 TL4 deection
is 1.0m. A range of deections for TL2 and TL3 can be found
in Table 1a, whilst Table 1b shows deection and working
widths for the MASH TL4 10,000kg truck with various post
spacings.
6.2 Slopes
The maximum cross fall for an installation of Ezy-Guard HC
is 10H:1V (10%).
Proximity to a batter slope will depend on the required
containment level. For TL3 containment, the recommended
minimum oset from hinge point to back of post is 300mm for a
2H:1V slope. For a TL4 containment, the offset from face of rail
to the hinge point should be equal to the expected deection,
refer section 6.1.
Figure 4: Batter Proximity
Table 1a: Dynamic deflections under various post spacing and impact speeds
Containment Level
Vehicle: 2,270 kg Impact Angle: 25˚
Speed
(km/h)
Post Spacing (m)
2
1
0.5
Dynamic
Deflection (m)
MASH TL3
100
1.16
0.81
0.53
80
0.8
0.6
*
MASH TL2
70
0.69
0.5
0.27
60
0.59
0.35
*
Table 1b: MASH TL4 working width and dynamic deflections under various post spacing
Vehicle: 10,000 kg Impact Angle: 15˚ Speed: 90 km/h
Post Spacing (m)
2
1
0.5
Deflection (m)
1.77
1.27
0.5
Working Width (m)
2.46
1.88
1.16
* Not currently available. Please contact your local Ingal Civil representative for more information.
Содержание Ezy-Guard HC
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