19 Revision 33 October 2022
deflection exceeds 150mm measured at a height of 610mm, see sections 7
and 8 of this manual.
Please note if positive test data already exists from the adjoining VRS then
this is acceptable as confirmation that the ground conditions are suitable for
the P4.
If there is no test data for the adjoining VRS then a sacrificial post will be
needed to be installed to allow testing.
The Safe End P4 can be connected to any N2 system of the following
working widths, W1, W2, W3, W4, W5 and W6 which means it can be
connected directly to OBB and TCB see system drawings P4-GA drawings.
It can also be connected directly to MegaRail H1 W4.
W
here the Safe End P4 is being installed over shallow drainage or other
obstruction it is advisable to reduce the length of the anchorage nail to an
absolute minimum of 800mm, the cut end of the nail should be treated with
zinc rich paint in accordance with the galvanising specification BS EN ISO
1461. The shortened nail should be set in a concrete foundation of not less
than 500mm square x 900mm deep
5.7 Connection to Other Proprietary VRS
SAFEROAD have such confidence in the MegaRail family of products and
their total compliance with EN 1317 that they are willing to allow connection
to any other reputable EN 1317 system that has been correctly tested and
where the promoters of that system confirm their product will perform
correctly up to but not including the joint.
SAFEROAD will guarantee the joint if it has been connected using our
fixings and is in specification. We will not however guarantee the
performance of the other system. It is critical that in the area of the
connection post centres are correct for both systems. Deviations should be
at least 8m from the joint.
5.8 Installation on Curves
On curves with a radius greater than 50 metre standard beams can be used.
On 30 metre radii to 50 metre radii 2 metre beams may be used.
On 5 metre to 30 metre radii pre-formed radius beams must be used.
Radii less than 5 metre cannot be achieved.
No pre-formed radius beams can be used on systems with post spacings
greater than 4 metres for example N2W4 EP c/c which has 6 metre post
spacings.
The normal system progression rules must be applied either side of any
radius.
MegaGuard cannot be used on radii less than 80 metre.
Megaflex Transition does not have a radius option and must be installed in a
straight line for the section that contains the backing beam, it then can be
flared up to a maximum of 250mm.
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