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ROAD 870

Road project including two steel bridges, two cut-and-cover tunnels, two roundabouts, three first-rain treatment plants, sewer systems, a tunnel runoff water lifting plant, laminated wood footbridge, a 25-hectares riverside park, an equipped city park, lighting systems, noise barriers, etc.

Where
Bologna (BO)
Task
Preliminary, Detailed and Final Design
Client
CONSORZIO CAVET - CMC RAVENNA
Period
1997 - 2009

Project summary

The project concerns the urban section of a new road axis located in the western outskirts of the city of Bologna, planned since 1985 in the master plan. That road axis is necessary to connect the settlements located in Savena valley, south of town, with the ring road (“Tangenziale”) and motorways. The constraints in the territory, due to the presence of the Bologna-Florence historical and high speed railway lines, and of the riverbed flanked by a highly urbanized area on the one hand and on the other by the Gessi Bolognesi Park, which represents one of the main naturalistic points of interest of the area, the project underwent a long and troubled process. The concern for the environment influenced the choice of the alignment and the design of the road typical cross sections, stimulated the adoption of specific types of bridges and the insertion in the project of vast actions of afforestation and renaturation of the territory. Construction took place in three successive lots, the first of which was completed in 2003 and the third in 2019.

The project activities covered the following aspects:

  • about 2200 m of road track, two roundabouts and several junctions to the existing road and private accesses;
  • two steel bridges with two spans each, with total lengths of 70 and 81 m;
  • two cut-and-cover tunnels (160 m long and 260 m long) in which the temporary support of the excavation was get by means of  micropiles and soil anchors; the structure was made with cast-in-situ concrete, with precast prestressed beam integrated into the roof;
  • some hundred meters of noise barriers, made with reinforced earth hillocks and/or wooden panels on concrete curbs; public lighting plants of the road, roundabouts, tunnels and bridges;
  • the details of runoff water sewers system;
  • three first-rain water treatment plants,
  • one park that spreads for about 25 hectares, with variable characteristics between natural river park and urban park equipped with games for children, with pedestrian and cycle paths;
  • minor works (a lamellar-wood walkway, parking lots,  etc.);
  • traffic signals.

The development of the construction project involved the drafting of over 220 tables in A0 format and about 70 illustrative and calculation reports.

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