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  Monitoring Atocha-Chamartin High Speed Railway tunnel. Madrid (Spain)

  The High Speed Tunnel between Atocha and Chamartin Stations in Madrid is the biggest diameter of Spain. Its execution has been particularly delicate because of the particularity of being fully implemented in urban environment. The tunnel has approximately 7 km long and an outer diameter of 11.495 mm. It runs below 8 lines metro, parkings of 4 floors, collectors, buildings, commuter tunnels, etc., that has required deploy a great system of monitoring that allowed control at all times the movements that could originate during excavation. It has been installed more than 3000 devices, it has been carried on up to 4 measurements per day (3 day and 1 night), and it has been installed continuously measuring sensors that recorded data 24h per day. Automatic and manual measures during 24h per day enabled us to detect the slightest movements as soon as possible.

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