Notice of start of investigation based on investigation policy about Chofu-shi ground surface depression

Thank you for your continued understanding and cooperation in the Tokyo Outer Ring Road Project.

On Sunday, October 18th, a ground surface collapse event occurred near 2-chome, Higashi Tsutsujigaoka, Chofu City, and we are causing inconvenience to everyone in the area, such as closing roads.

In order to investigate the cause of the collapse event, the investigation policy was confirmed at the "Tokyo Outer Ring Tunnel Construction Review Committee Expert Committee" on October 23 (Friday), and boring investigation, acoustic tomography, road surface cavity investigation, etc. were conducted. We decided to carry it out.

Please see the Tokyo Gaikan Project website for the schedule of each survey.