Construction—EMEA—Spain—Slope Stabilizations
DSI supplies self-drilling DYWI ® Drill Hollow Bar Anchors to widen
National Road II in Girona
The A-2 Highway – also known as NE Highway – is a motorway that
connects Spain’s capital Madrid with Barcelona. In some areas, the
A-2 has not yet been expanded to a motorway, and traffic is directed
via the old National Road N-II.
In the province of Girona in Catalonia,
approximately 20.000 vehicles use the
National Road N- II per day. Due to the high
traffic density, the Public Works Ministry
decided to develop the 6km long section
between Sils and Caldes de Malavella near the
French border into a motorway.
Work on this section was delayed for more
than 7 years due to the economic difficulties
experienced by one of the companies
participating in the construction joint venture.
In 2013, Acciona Infraestructuras resumed
construction work and successfully completed
the section in 2014.
The development of the old National Road II
into a new motorway also required the
construction of new bridges in this area.
The abutments of the new bridges are founded
on existing retaining walls that were originally
built for the construction of the old National
Road II.
The height of the retaining walls had to be
partly increased. To increase their load-bearing
capacity, the existing retaining walls were tied
back using self-drilling 32mm Ø DYWI ® Drill
Hollow Bar Anchors. For this purpose, the
hollow bar anchors were installed by means
of a lost drill bit using rotary percussion, with
the hollow bar serving for flushing with water,
respectively a water cement suspension.
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This method allowed mesh to be anchored
vibration-free at the existing retaining walls and
then shotcreted. Due to the excellent adhesion
between the shotcrete and the existing
retaining wall, no bonding course was required
and the surface was closed monolithically.
As a result, the load-bearing capacity of the
retaining walls was permanently increased.
Due to the flexibility of the DYWI ® Drill
Hollow Bar System, the self-drilling
DYWI ® Drill Anchors were used both
as temporary anchors and as soil nails.
The soil nailing served to augment the soil’s
stability by means of installing reinforcing
elements. Soil nailing builds up a supporting
structure, with the soil nail being primarily
subject to tensile loads.
In this project, the DYWI ® Drill Hollow Bar
System was not only used because of its
proven high quality, but also due to the fact
that DYWI ® Drill Hollow Bars can be installed
quickly: They neither require primary drilling
nor sheathing. In total, DSI supplied 6,700m
of R32-320 DYWI ® Drill Hollow Bars and
accessories for widening this section of the
road.
Owner
Public Works Ministry, Spain
General Contractor
Acciona Infraestructuras, S.A.,
Spain
Subcontractor
Perfo – Roca, S.L., Spain
DSI Unit
DYWIDAG Sistemas Constructivos
S.A., Spain
DSC Scope
Production, supply, technical support
DYWIDAG Products
6,700m of R32-320 DYWI ® Drill Hollow
Bars and accessories