INGAL Ezy-Guard 4, Product Manual, Page: 14 / 34

Roadside Safety Barrier
14
Release 07/22b
Figure 11:
Figure 12:
Figure 11: Curvature Measurements
Figure 12: Curvature Orientation
7.11 Curving of Rails
Guardrail used for the assembly of Ezy-Guard 4 may be
shop curved to fit any radius from 2.4m to 45m Convex.
Ezy-Guard 4 for Concave Curves can be used from 2.4m to
45m. Curves in excess of 45m do not require shop curving
as the rail can be field installed to suit. Guardrail may be
curved either concave or convex to the traffic face and can
be part-curved along its length to suit site requirements.
7.11.1 Measuring Curvature
1. Mark along the arc of the curve at 4m intervals.
2. Measure the corresponding chord length (C) - refer
to Figure 11.
3. Measure the corresponding centre offset (H) - refer
to Figure 11.
4. Use the values for C & H to select the radius from
Table 5.
5. Determine the curvature orientation from Figure 12.
7.11.2 Identification of Curved Rails
Where a rail has been factory curved by Ingal, the radius
of curvature is marked on the rear face of the rail.
Table 5: Rail Curvature Values
Radius (m) Ø Degrees C (mm) H (mm)
2.4 95 3553 786
3 76 3710 642
4 57 3835 490
5 45 3894 395
6 28 3926 330
7 33 3946 284
8 29 3958 249
9 26 3967 221
10 23 3973 199
12 19 3982 166
14 16 3986 143
16 15 3990 125
20 12 3993 100
24 10 3995 83
28 8 3997 71
32 7 3997 62
35 7 3998 57
40 5 3998 50
45 5 3999 44