- ACCIONA
- Projects
- Construction
- Railways and Tunnels
- Bologna Tunnels
The project comprises two 6.1-km tunnels for which two Earth Pressure Balance tunnel boring machines of 9.4-m diameter were used. The excavation of the tunnels in an intensely urbanized context and the heterogeneous ground conditions required a particular methodology in order to minimize the effect on the existing structures and facilities on the surface.
This project featured the world’s first experiment with earth-consolidating injections and compensation with guided boring along a curved line. Other innovations included metal rings with doors for connecting galleries, designed by ACCIONA Engineering.
Design and construction of the high-speed urban train in San Juan, running from Rio Bayamón via Centro Médico to Villa Nevarez and Hato Rey.
The longest tunnel excavated from a single entry point and the ninth longest in the world.
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