


For the advance of underground utilization technology
~ JTA 50th Anniversary 1975-2025~
Update information
- Tunnelling Activities in Japan 2024
Exhibition(WTC2025)2025.05.07 TODA2025.05.07 MAEDA2025.05.07 SATO2025.05.07 SHIMIZU2025.05.07 ORIENTAL CONSULTANTS GLOBAL2025.05.07 PACIFIC CONSULTANTS2025.05.07 FUJIMORI2025.05.07 NEXCO WEST2025.05.07 NEXCO CENTRAL2025.05.07 NEXCO EAST2025.05.07 OBAYASHI2025.05.07 KAJIMA2025.05.07