12 Revision 33 October 2022
4. Installation
It is the installers responsibility to ensure that they are working to the current
manual and drawings.
These can be found at www.saferoad.co.uk/products/safety-barrier/
4
.1 Setting Out
Establish the length of need both in advance and on departure from the
hazard excluding terminal lengths. Set out the post pitches ensuring that the
length of need is covered. If there are any obstructions on the fence line and
if the site conditions do not allow a post to be installed on the system pitch
deviations can be applied. The obstructed post can be omitted and extra
posts installed to span the obstruction.
Please note that each system has different rules so refer to each system
drawing GA-40 for details as to what can be done.
Although it would be beneficial to use the holes already in the beam it is
acceptable to drill new holes on site in the desired position and treat the
beam with a zinc rich paint to comply with the galvanising specification BS
EN ISO 1461.
Another method of deviating is by using an offset post. The posts can be
manufactured to suit the location within the following parameters, the base
plate must be a minimum of 50mm thick and the offset plate no longer than
700mm. Refer to each system drawing GA-00 for details.
The post pitch must return to the correct system position within 8 metres of
the last correctly positioned system post as and remain correctly positioned
for a minimum of 4m.
If obstacles cannot be circumvented by these methods it may still be
possible to provide a compliant design, contact our technical department
whose details can be found at the back of this manual.
If a bridge expansion joint is to be spanned, then a pre-assembled
expansion beam assembly should be installed as per drawing MR-GA-025.
Where system progression is required, the progression should be by only
one working width at a time. i.e. N2 W3 to N2 W2 or N2 W3 to N2 W4.
4.2 D
riven Posts
Before any post driving is considered the area should be thoroughly
checked for the presence of services. Wherever it is practicable, the
installation of VRS over services should be avoided. We would recommend
a minimum of 500mm safe working distance between driven posts and
adjacent services.
Ensure the correct post is used and that on the verge the closed side of the
post faces the oncoming traffic. In the central reserve the closed side should
face the oncoming traffic on the carriageway nearest the VRS.
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