Roads & Motorways

Milan Eastern by-pass road (A51)

Restoration of the Lambrate junction and new access road to the Intermodal Center in Segrate
Owner/client Milano Serravalle Milano Tangenziali S.p.A.
Type of service Final and Detailed Design; Works Management; Environmental Impact Assessment; Safety Coordination Design and during Construction
Location Segrate
Period 1998 - 2014
End of work 2014
Cost € 42.500.000

The design concerns the definition of the works necessary to restore the Lambrate junction and to complete the structures partially constructed for connection with the Intermodal Center in Segrate.

The design of the new junction on the Eastern By-Pass Road of Milan has been influenced by several constraints posed by the urban conurbation that can be found in the area. As a consequence, a system of indirect ramps has been adopted, which fully exploits the several passages offered by the presence of the Viadotto dei Parchi on the Eastern By-Pass Road, and successfully solves any conflicts among the directions served by the junction. In two cases (ramp Segrate–Bologna and ramp Milan–Venice), in order to reduce the space requirement of the junction and allow radii of curvature compatible with the applicable provisions, a part of the ramps had to be covered by an artificial tunnel.

As to completion of the roads to the Intermodal Center, the pre-existing constructions dating back to the period 1991-1994 for connection to the I.C. in Segrate served as a guideline that significantly influenced the design, especially with regard to the implementation of the technical rules concerning the characteristics of roads and safety barriers.

Infrastructure works of Lambrate

3 junction viaducts (similar to the Parks Viaduct); 1 reinforced concrete overpass in situ (centrally ribbed plate); Bridge adaptation over the Lambro river (precast concrete beams); 1 cycle/pedestrian path.

Geotechnical works of Lambrate

3 tunnels with reinforced concrete diaphragms and precast prestressed concrete roof beams; Completion of the "Bretella Nord" tunnel

Hydraulic works of Lambrate

4 water treatment tanks (in situ cast concrete).

Infrastructure works of Segrate

3 central ribbed plate overpasses in cast-in-place reinforced concrete

Geotechnical works of Segrate

1 artificial tunnel (precast reinforced concrete beam roof and cast slab); reinforced concrete waterproofing shells (partially anchored to the ground with steel tie-rods).

Hydraulic works of Segrate

3 flywheel tanks cast in situ in reinforced concrete.

Vista aerea dello svincolo (foto G. Albo)
Vista ponti e passerella ciclopedonale (foto G. Albo)
Parrticolari passerella ciclopedonale (foto G. Albo)
Vista dello svincolo (foto G. Albo)
Vista dello svincolo
Asse principale
Rampe di svincolo

From a planimetric and altimetric perspective, the road originates from the junction on the current SP 103 just downstream of the Lambrate junction, and continues in a trench at an average altitude of –6.50 m above sea level, crossing the hamlets of Lavanderie and Redecesio in Segrate. In this section, the upgrading works of the local roads shall be completed, which remain fully connected at surface level, without altering the current balance between territory and local roads. Downstream of the West junction to the Intermodal Center, the road develops again at-grade at the 'Cava Trombetta', after which it joins the eastern continuation stretch that shall be designed and constructed by the Province of Milan.

For both Lots, the ground water at 3 meters under the natural surface level made it necessary the waterproofing of the slip roads in the trenches and in the tunnels. The chosen solution has been to build a reinforced concrete shell protected by a nonwoven fabric and by a HDPE sheath.

The new junction design on the Tangenziale Est (East Orbital Road) of Milan was conditioned by the numerous constraints induced by the urban conurbation of the area.