we plan the world of tomorrow.
Milan Outer East Bypass Road
Tangenziale Esterna S.p.A., awarded the Concession in January 30th, 2009, is proceeding with design, construction and operation of the Milan Outer East Bypass Road according to the Agreement signed with the Grantor Concessioni Autostradali Lombarde (CAL) S.p.A.
Project: Final Design for Construction and Operation of the Milan Outer East Bypass Road.
Location: Milan, Italy.
Client: Tangenziale Esterna S.p.A..
Cost of total Works: 1,700,000,000
Services: Hydrology and Hydraulics, Geology, Geotechnics, Seismics, Engineering Structures, Tunnel Safety.
Period: 2011-2015 (estimated).
The work has a length of approximately 32 kilometers with a motorway section with closed tollgate and connects the A1 Milan Bologna motorway to the east of Melegnano with the A4 Milan Venice motorway to the east of Agrate. The works include junctions with the A1 and A4 motorways and a junction with the BRE.BE.MI motorway as well as 6 interchanges (Pessano Interchange with Bornago; Gessate / Gorgonzola Interchange; Pozzuolo Martesana Interchange; Liscate Interchange, Paullo Interchange, Vizzolo Predabissi Interchange). In addition to the main axis there are 38 kilometers of related works and 15 kilometers of existing roads that will be upgraded.
The goal of the project is to relieve the almost permanent situation of congestion of the current network of bypass roads around, the capital of Lombardy, characterized by traffic on the most travelled sections equal to about 170,000 vehicles per day. The Milan Outer East Bypass Road (TEEM), which is supposed to carry an average daily traffic load of about 70,000 vehicles when in full operation, connecting the A1 motorway (Melegnano) and A4 motorway (Agrate Brianza) meets the need to distribute long distance traffic, separating it from the traffic directed towards the area of Milan.
The Consorzio Tangenziale Engineering, CTE, set up among the companies SPEA – Ingegneria Europea Società per Azioni, Società Iniziative Nazionali Autostradali S.I.N.A. S.p.A., MILANO SERRAVALLE ENGINEERING S.r.l., PROITER Progetto Infrastrutture Territorio – S.r.l., TECHNITAL S.p.A., GIRPA S.p.A., has been entrusted, as Partner of Tangenziale Esterna S.p.A., with drawing up Final Design, the Environmental Impact Study and further investigation activities required for final approval by CIPE and preparatory to the works construction phase.
Final Design was developed based on the Preliminary Design published on June 16th, 2003, revised in 2004 to acknowledge CIPE requirements – CIPE resolution No. 95 dated July 29th, 2005 and the resolutions by the Supervisory Board of the Program Agreement. In this context Technital handled studies related to hydrology, hydraulics, geology, geotechnics and seismics as well as design of the engineering structures on the main axis. These include the Viaduct over the Lambro river, a structure with approximately 1.6 kilometers in length that passes over the river, the railroad (both the traditional and the high-speed lines) and the A1 motorway. The work consists of 2 side-by-side structures with maximum 160 meter spans using orthotropic slabs and having important architectural significance.
The other main motorway structures are:
- the artificial A4 tunnel with a length of L=67 meters that permits the Milan Outer East Bypass Road to pass under the A4 motorway. This tunnel is forecast to be constructed away from the installation site and then to be pushed underneath the motorway. This requires a temporary deviation of the A4 motorway due to construction time requirements and motorway traffic safety.
- the Villoresi artificial tunnel with a length of L=100 meters, that permits the Milan Outer East Bypass Road to pass under the Villoresi channel. Construction of this work envisages temporary interruption of operation by the channel;
- the Gessate artificial tunnel with a length of L=100 meters, that permits the Milan Outer East Bypass Road to pass below the MM2 subway line. This structure is forecast to be constructed away from the installation site and then to be pushed underneath the subway line without interrupting operation;
- the Martesana artificial tunnel with a length of L=440 meters, that permits the Milan Outer East Bypass Road to pass under the Martesana navigable channel. This construction, with Milan-standard section, envisages temporary deviation of the navigable channel;
- the underpass below the four track F.S. Milan-Venice railroad line, L=50 meters, permitting the Milan Outer East Bypass Road to pass under the railroad line. Construction is forecast to be away from the installation site with the work then to be pushed into place without interrupting railroad operation;
- the bridge over the Molgora stream with a mixed steel-reinforced concrete structure and a length of L=20+45+20 meters;
- the bridge over the Muzza I channel with a mixed steel-reinforced concrete structure and a length of L=22+55+22 meters;
- the bridge over the Muzza II channel with a mixed steel-reinforced concrete structure and a length of L=22+55+22 meters;
- the Cologno artificial tunnel with Milan-standard section and length of L=455 meters designed to mitigate the impact of the new bypass road on the adjacent inhabited areas of Madonnina di Dresano and Cologno di Casalmaiocco;
Distinctive element of the work
To describe the project we illustrate the solution taken for the section between Via Emilia (SS9) and the Melegnano junction with the Autosole (A1) motorway, characterized by the presence of many constraints and interferences that heavily condition its morphology, altimetrics and alignment.
This section includes, in addition to working with local and provincial roadways (SP17) and to the presence of an artificial dumpsite hill, the need to get past the two Railroad Lines (traditional and high speed), flanking each other in this section, and to make a strongly oblique passage over the Lambro riverbed.
The solution that was carried forward, after various studies and proposals, envisaged flanked viaducts, the two viaducts of the Milan Outer East Bypass Road and that of the adjacent new connection link between SS9 and SP17, each with regular approx. 70 meter spans plus larger spans to cross the railroad tracks (110 meters) and the Lambro river (160 meters). Considering that we have all of three structures, flanked at minimum distances from each other, it is clear that the number and layout of piles created great difficulties in determining the formal language to give to the works in terms of visual, esthetic and landscape impact. This is why such great importance was assigned to the geometric shape of the central piles which, thanks to their fork form, have assumed the role of esthetically and formally distinctive elements.
Summary of project technical characteristics
Route length: Approximately 32 kilometers from the A1 Melegnano motorway to A4 motorway to the east of Agrate, 38 kilometers of related works and 10 kilometers of road to be upgraded;
Standard section: Category A – Suburban motorways with three lanes in each direction (L=3.75 meters) and hard shoulder (L=3.00 meters), 4.20 meter median strip for a total width of the motorway platform equal to 32.70 meters;
- Artificial tunnels: 1.2 kilometers;
- Trenches: 7.3 kilometers;
- Viaducts: 1.9 kilometers;
Average daily traffic: 70,000 vehicles
- 3 motorway junctions (A1, A4 and Brebemi),
- 6 interchanges to normal road network (Pessano interchange with Bornago, Gessate / Gorgonzola interchange, Pozzuolo Martesana interchange, Liscate interchange, Paullo interchange, Vizzolo Predabissi interchange);
- Provinces: 3 (Milan, Lodi, Monza and Brianza),
- Involved in Cities: 34 (Milan 21, Lodi 10, Monza and Brianza 3),
- Park agencies: 3 (Molgora Park, South Milan Agriculture Park, South Adda Park).