Large-diameter shield-tunnelling capability and improved constructability of the FAST construction method
First written in FY2019. 4 of 8 entries say "Advanced", first in FY2023. Latest entry: FY2026.
3 other companies' latest entry also says "Advanced".
- FY2026AdvancedAnnual report
「By the end of FY2025, they had been used in a cumulative total of 55 construction projects. We are also carrying out further development and improvements to rationalize the segment structure and address greater depths.」
Cumulative FFU segment applications increased from 48 at the end of the previous fiscal year to 55, and development of improvements to rationalize the structure and address greater depths is continuing. - FY2025AdvancedAnnual report
「By the end of FY2024, they had been used in a cumulative total of 50 construction projects. We are also carrying out further development and improvements to rationalize the segment structure and address greater depths.」
Cumulative FFU segment applications increased from 48 to 50, and development of improvements to rationalize the segment structure and address greater depths is continuing. - FY2024AdvancedAnnual report
「By the end of FY2023, they had been used in a cumulative total of 48 construction projects.」
The disclosure indicates that cumulative FFU segment applications increased substantially from 6 in the previous fiscal year to 48 construction projects. - FY2023AdvancedAnnual report
「In FY2022, they were used in 6 Urban Ring shaft construction projects for shield-tunneling projects.」
FFU segment applications increased from 5 in the previous fiscal year to 6. - FY2022Decrease in FFU segment applicationsAnnual report
「In fiscal 2021, the technology was used in 5 Urban Ring shaft construction projects for shield tunneling.」
FFU segments were used in 5 projects in FY2021. This was down from the 10 applications disclosed for the previous fiscal year. - FY2021Disclosure of FFU segment applicationsAnnual report
「In FY2020, it was used in 10 shield-tunneling projects.」
New disclosure indicates that FFU segments had been used in 10 projects as a technology for branching and merging in shield-tunneling projects. - FY2020DroppedAnnual report
「The company's research and development structure and major R&D results are as follows.」
The large-diameter shield-tunneling capability and expanded applicability of the FAST Method described in the previous fiscal year are not included in the list of major research and development results for the current fiscal year. - FY2019First statedAnnual report
「In FY2018, we developed a joint structure for FFU segments that supports large-diameter shield tunneling and facilitates underground transport of FFU segments. Going forward, we will use the FAST Method to expand its application to large-diameter shield tunneling and other areas and to improve constructability.」
For the shield-tunneling branching and merging method, we developed technology for large-diameter applications and a joint structure for FFU segments, with the aim of expanding its range of applications.