TDDT allows to keep a record in real time, and to correct the direction of the probe while drilling thus achieving a very accurate and precise hole path.
This technology is behind important works accomplished, or still in progess, by Trevi.
- Naples Subway: soil freezing for tunnel boring (Garibaldi, Toledo and Università stations).
- Bologna, High Speed Railway: compensation grouting.
- Arapuni Dam, New Zealand: consolidation works and cut-off restoration.
After an extensive market research, Japan Foundation decided that TDDT was the most suitable and reliable technology for those future projects, where construction of new tunnels in urban areas, barrier walls, isolation and recovery of polluted areas and protection of industrial plants from seismic risk requires little or no deviation of long drilled holed.