![]() In the case of the M4, the tunnels are being dug at a greater depth than Cityringen or the B1. ![]() Before that, it had done them along the B1 Line in Rome.ĭigging beneath a crowded urban centre entails an exceptional commitment to monitoring and analysis, both in the design and in the execution of the works. To protect Milan’s architectural and artistic heritage, the company responsible for the project (owned by the city and a group of companies led by Salini Impregilo and Astaldi) has adopted a technical protocol for underground work that combines preventive analysis with continuous monitoring. These procedures were tested by Salini Impregilo when it built Cityringen, Copenhagen’s new driverless metro inaugurated on September 29 by Queen Margrethe II. Milan’s Mobility Superintendent Marco Granelli said in December the goal was «to stick to our time table: in January 2021 we will open the first section from Linate to Forlanini, the section from Dateo to San Babila at the end of 2022 and then the whole line in July 2023». The eastern part is already completed, while the west is 72.5% done. For this section, larger TBMs are being used, measuring 9.15 metres across, so that passengers can disembark directly inside the tunnels, reducing the space occupied by the stations to a minimum. In January, excavations began on the central section of the route, which includes eight stops (Tricolore, San Babila, Sforza Policlinico, Santa Sofia, Vetra, De Amicis, Sant’Ambrogio, Parco Solari). These are just a few of the things that stand out in what is being called “the neighbourhood’s metro,” a project that aims to let local people have their say not only from the moment it opens its doors, but also while it was being built. This led to certain decisions being taken to minimise the impact of the construction works on nearby residents, such as disposing the earth excavated in the tunnels by using underground conveyor belts instead of trucks or working with the superintendent’s office to display the archaeological finds unearthed during the excavation at the Archaeological Museum of Milan. So anyone could have their say about the M4 project, giving feedback, presenting a proposal or raising criticism or concern, be it from a neighborhood committee, a business owner or an individual resident. In 2018 alone, 10,000 people took part in the “open days” organised to let the curious visit the new stations. The M4, funded by a public-private partnership with construction led by a consortium headed by Salini Impregilo, was designed from the very start to encourage residents to be involved.
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