Marcegaglia Buildtech N2BL-MARC2013 User manual

Barrier system N2W4 Lateral Side
N2BL-MARC2013
INSTALLATION MANUAL
NORWAY
Installation Manual Rev.002 –Nov. 2015
Drawn up by: Mauro Monteleone
Checked by: Giacomo Molinari
Approved by: Mauro Monteleone

Contents
1. General information
2. Installation conditions
3. Preliminary operations
4. Installation of the Posts
5. Installation of the Guardrail
6. Assembly in a curve
7. Inspections-Maintenance
8. Fixing the guardrail
9. Durability
10. Regulatory and technical references
11. Attachments and annexes
1. General information
This document is the manual for assembling the 2-wave beam metal guardrail called
N2BL-MARC2013 / N2W4.
All the operations and the phases have been formulated for the correct installation
and functioning of the guardrail, any modification should be agreed with, and
authorized by, Marcegaglia Buildtech s.r.l.
Particular attention should be paid to the tightening phases with the necessary
screws to avoid assembly problems in the successive stages.
The device (see MB-1851 assembly drawing) is composed of:
- 2-wave beam, 2mm thick Pos. 1
- C-shaped post 120x55x30, 4mm thick Pos. 2

2. Installation conditions
The N2BL-MARC2013 / N2W4 guardrail is purposely designed for use as a roadside
guardrail, to be installed on the ground.
You should make sure that the installation area can be accessed by the pile-driver
vehicle and that there are no obstacles above the surface (trees, walls or pipelines,
service structures, etc.).
3. Preliminary operations
For an efficient installation it is recommended to start by putting all the necessary
material on the ground along the stretch where the guardrail is to be installed.
In particular, once the installation line has been decided, it is recommended that the
2-wave beams are placed on the ground horizontally with the wire along the line
where the posts are to be positioned.
Their positioning should be precise especially where the beams overlap.
At this point you can drive in the first post of the stretch with a pile-driver and then
you stretch a line to make sure the successive posts are aligned correctly.
When fixing the first post the penetration depth should also be checked so that the
guardrail has the right height when completed.

Normally, once the depth has been reached, the position should be highlighted by
the pile-driver tool so that there is a precise reference point for the penetration of all
the other posts.
4. Installing the posts
Having followed the recommendations above, positioning the poles becomes quick
and precise since:
- the longitudinal width is given by the position of the holes on the beams laying
on the ground
- alignment is guaranteed by the line
- the depth of penetration is given by the reference point on the pile-driver.
The vertical height of the head of the post can be out by +/- 1 cm since there are
special slots for correctly installing the 2-wave beam.
Care should be taken that the pole is absolutely straight in the two directions, and
this achieved using movements shifts of the pile-driver.
5. Installation of the guardrail
The 2-wave beam is then lifted (starting from the bottom of the tract so as to obtain
the correct overlap of the beams).
The bolt for the next post is positioned only when the next beam is overlapped; these
connections are formed of an M12 bolt, a nut, a washer and a rectangular slot
covering plate to be positioned in front of the 2-wave beam.
At this point, it is also possible to fix the bolts (M16x30 TE) joining the beams (8,
complete with nut and washer).

Once this stretch has been assembled it is necessary to vertically align the beams in
order to have the entire guardrail at the same height, or in any event at the same
distance from the road.
Normally this operation is carried out by sighting the first beam and gradually
correcting the successive ones by tightening the bolts that connect the beam to the
post with a torque greater than or equal to 10 Nm +/- 1 Nm.
It is then possible to tighten the bolts joining the 2-wave beams, applying a torque
greater than or equal to 40 Nm +/- 5 Nm.
6. Assembly in curve
The guardrail in question can also be installed in curved stretches having a minimum
curvature radius of 60m, and there are appropriate slots that allow the installation
using special standards.
Below this measurement it is necessary to calander the beams, and so an on-site
survey and a specific design is required.
7. Inspections-Maintenance
The guardrail in question does not require any maintenance under normal working
conditions.
It is recommended that the tightness of the bolts are checked every two years in case
traffic vibration has loosened them.
If this is the case, further tightening is required to return to the required torque.

8. Fixing the guardrail
In the event of an accident it is necessary to fix the damaged guardrail.
Depending on the severity of the impact it is possible to replace the damaged
elements, starting with the 2-wave beams, up to replacing the posts.
Basically, it is recommended that the entire damaged guardrail is replaced starting
with the stretch before the first deformed element (4m) and including the stretch after
the last damaged element.
It is also recommended that the ground is compacted where the posts to be replaced
have been removed.
9. Durability
All the components have been treated with a hot-dip galvanizing process in
accordance with UNI 1461, with minimum thicknesses and covering depending on
the thicknesses of the various elements.
10. Regulatory and technical references
UNI EN 1317-5 /2007 (road restraint systems)
UNI EN 22768: 1996 (tolerances)
11. Attachments and annexes
Assembly drawing of the N2BL-MARC2013 / N2W4 / MB-1851.