17 Revision 33 October 2022
also a push test on the surface mounted post equal to the load required for
the system which the plate is acting as a foundation for.
5 MegaRail ASSEMBLY
5.1 N2, H1 & H2 systems
• Posts must be set as described in section 4 and the post pitches and
positions must be as the system drawings dictate.
• Beams should be hung on the posts using the correct fixing hand tight only.
Beams must be hung in the correct orientation so that the teardrop holes in
the beam are over the top of the circular holes in the adjoining beam. The
system is innovatory designed to ensure there is no requirement for slack
removal using tapered bars. The beams are fastened with MegaRail M1
6
l
ap bolts. For diameter of the post bolts and all torque settings refer to the
MegaRail manual.
• Pedestrian or motor cycle protection should be fitted if it is required as the
system is assembled.
• An inspection of the safety barrier should be carried out using the inspection
check list on page 20, taking into account the tolerances detailed in section
2.9 above.
NOTE: when securing MEGARAIL fasteners, a minimum of one thread must
appear through the nut.
5.2 Connection to TCB and OBB
For connection to either TCB or OBB please see MegaRail drawing
MR-GA-040. The system requirements for both NPSBS and MegaRail must
be adhered to. When connecting to either TCB or OBB correct system
progression must be maintained. If connecting to TCB there must be an
adjuster assembly in the TCB within 35m of the connection. Connection to
OBB should be made using an A06 connection piece.
5.3 Mega Guard
Mega Guard should be installed on a concrete foundation, minimum length
of slab/trench detail as stated in General Note 6 on drawing H2W1-GA-11.
The slab/trench detail should be reinforced to prevent cracking.
When installing Mega Guard at standard 2mtr post spacings or using
permissible deviations, singular foundations may be used – minimum size
and type of foundation will be determined by following the post foundation
testing procedure.
When using surface mounted posts, these should be fixed with SAFEROAD
anchorages if wet set. Or a suitable proprietary resin anchor if post drilled.
Posts to be set on a grout bed of between 10 and 30mm. Beams should be
hung on the posts using the correct fixing hand tight only. Back Beams must
be hung in the correct orientation so that the arrow goes with the flow of
traffic. The beams are fastened with Mega Flex M16 lap bolts which should
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