Madrid’s Metro Expansion: The Mayrit Tunnel Boring Machine
The ‘Mayrit’ tunnel boring machine has commenced its impressive operation beneath the bustling streets of Madrid, dedicated to the expansion of Metro Line 11. So far, this colossal machine has successfully excavated 672.6 meters of tunnel from the future Comillas station. Recent data from the Ministry of Housing, Transport and Infrastructure indicates that Mayrit is gaining significant momentum in its work.
Progress Figures
In less than two months of operation, Mayrit has successfully extracted an astonishing 46,676.2 cubic meters of earth. This volume is equivalent to around 19 Olympic swimming pools! Furthermore, the project has already seen 389 out of 3,076 concrete rings placed, which will line the 5,227 meters of tunnel between Comillas and Conde de Casal. Each of these rings consists of seven voussoirs, uniquely crafted in a dedicated facility in Noblejas, Toledo.
Managing Excavated Materials
Mayrit employs a sophisticated method for managing the earth it excavates. The machine utilizes a cutting wheel to tare through the ground, with extracted material transported via a network of conveyor belts that extend as it progresses. The earth travels through the interior of the Comillas station, eventually reaching the surface and depositing into a pit with a capacity of 8,500 cubic meters. From there, backhoes load the excavated materials into approximately 150 trucks for final transportation. Remarkably, this extracted earth is being repurposed to restore multiple mining operations and even rehabilitate an abandoned landfill.
The Start of Operations
During its initial month of operation, Mayrit experienced a slower pace, partially due to its adjustment phase. However, as the machine has settled into its rhythm, projections indicate it will now excavate between 400 to 500 meters per month, working relentlessly 24/7.
Upcoming Milestones
The Ministry anticipates that the section extending from Comillas to Madrid Río, measuring 1,114 meters, will reach completion by next June. Once Mayrit finalizes this segment, it will pause for about two weeks for a technical inspection before continuing towards Palos de la Frontera, Atocha, and ultimately, Conde de Casal— the end point and future interchange hub of the line.
Material Requirements for Completion
To finalize this segment of the tunnel, substantial resources will be required: 32,000 tons of steel, 210,000 cubic meters of concrete, and over 25,000 segments. The production facility in Noblejas, with a dedicated team of 50 workers, is generating 42 segments daily, equivalent to six complete rings. The total monetary commitment for this phase surpasses 740 million euros, with project progress already exceeding 50%.
A Vision for the Future
The Madrid Metro Line 11 is not just a local initiative but a part of a grander vision. This “great diagonal” line will span 33.5 kilometers, connecting essential areas such as Cuatro Vientos and Valdebebas, along with serving stations like Atocha, the airport, and the future Formula 1 circuit at Ifema. Once completed, the journey across Madrid will only take one hour and six minutes, transforming commuting for countless residents. The overall investment for this expansive project exceeds 2.5 billion euros, with phases scheduled until 2031.
Conclusion
Madrid’s ambitious expansion of its Metro infrastructure through initiatives like the Mayrit tunnel boring machine exemplifies technological progress and urban development. As this project unfolds, it promises to reshape the landscape and connectivity of one of Europe’s most vibrant cities.