About the ground surface collapse accident near the construction site of the Tokyo outer ring road (Kan-etsu-Tomei)
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- Notice
- Important notice to customers
- About the ground surface collapse accident near the construction site of the Tokyo outer ring road (Kan-etsu-Tomei)
About the ground surface collapse accident near the construction site of the Tokyo outer ring road (Kan-etsu-Tomei)
- 1st report (October 18, 2020
- 2nd report (October 19, 2020
- Third report (October 19, 2020
- 4th report (October 22, 2020
- 5th report (October 23, 2020
- 6th report (November 4, 2020
- 7th report (November 4, 2020
- 8th report (November 5, 2020
- 9th report (November 22, 2020
- 10th report (November 25, 2020
- 11th report (November 27, 2020
- 12th report (December 17, 2020
- 13th report (December 18, 2020
- 14th report (January 15, 3rd year of Reiwa)
- 15th report (February 10, 3rd year of Reiwa)
- 16th report (February 12, 3rd year of Reiwa)
- 17th report (March 18, 3rd year of Reiwa)
- 18th report (March 19, 3rd year of Reiwa)
Tokyo Gaikan Tunnel Construction Review Committee Expert Committee
- Establishment Prospectus [PDF: 107KB]
- Committee rules, committee list [PDF: 112KB]
- 1st (October 19, 2020
- 2nd (October 23, 2020
- 3rd (November 5, 2020
- 4th (November 27, 2020
- 5th (December 18, 2020
- 6th (February 12, 3rd year of Reiwa)
- 7th (March 19, 3rd year of Reiwa)
About the progress of work and investigation on the surface depression of Chofu City
- Notice of start of investigation (October 23, 2020
- Implementation of road surface cavity survey (November 17, 2020
- Completion of cavity filling work (November 24, 2020
- Implementation of geophysical exploration around the depression (December 1, 2020
- Implementation of road surface cavity survey (December 3, 2020
- Completion of cavity filling work (December 3, 2020
- About the progress of the survey (2020 Reiwa) [PDF: 4.6MB]
- Implementation of geophysical exploration other than around the depression (December 7, 2020
- About the progress of the survey (2020 Reiwa) [PDF: 5.1MB]
- Implementation of geophysical exploration other than around the depression (December 17, 2020
- About the progress of the survey (2020 Reiwa) [PDF: 5.1MB]
- About the progress of the survey (2020 Reiwa) [PDF: 27.4MB]
- Implementation of road surface cavity survey (January 8, 3rd year of Reiwa)
- About the progress of the survey (January 12, 3rd year of Reiwa) [PDF: 27.3MB]
- About the progress of the survey (January 18, 3rd year of Reiwa) [PDF: 4.1MB]
- Completion of cavity filling work (January 22, 3rd year of Reiwa)
- About the progress of the survey (January 27, 3rd year of Reiwa) [PDF: 5.7MB]
- About the progress of the survey (February 1, 3rd year of Reiwa) [PDF: 4.1MB]
- Survey progress (February 8, 3rd year of Reiwa) [PDF: 4.1MB]
- About the progress of the survey (February 12, 3rd year of Reiwa) [PDF: 4.2MB]
- Damage in the Iruma River diversion channel (April 27, 3rd year of Reiwa)
- Regarding the identification of the ground repair range based on the survey results from the tunnel mine (September 10, 3rd year of Reiwa)
- About the result of the additional survey in Chofu city area (east side area of Iruma River) (December 14, 3rd year of Reiwa)
About maintenance measures associated with the shutdown of the shield machine
- Tomei Main Line Shield Tunnel Construction, Oizumi Main Line / Lamp Shield Tunnel Construction (October 29, 2020
- Oizumi Main Line (Northbound) / Oizumi JCTF Lamp Shield Tunnel Conservation Measures Notice (July 13, 3rd year of Reiwa)
Briefing session / open house regarding collapse accidents near the construction site of the ring road outside Tokyo
- 2020 session on November 6th and 7th, 2020 (November 17th, 2nd year of Reiwa)
- 2020 session on December 20th and 21st, 2020 (December 28th, 2nd year of Reiwa)
- February 14th and 15th, 3rd year of Reiwa Information session (3rd March, 3rd year of Reiwa)
- Information session from April 2nd to 7th, 3rd year of Reiwa (May 18th, 3rd year of Reiwa)
- Information session on December 17th and 18th, 3rd year of Reiwa (February 18th, 4th year of Reiwa)
- March 27th and 28th, 4th year of Reiwa Open House (March 29th, 4th year of Reiwa)
- September 11th and 12th, 2020 Open House (September 13th, 2020)
- October 7th and 8th, 2020 Open House (June 13, 2023)
- December 9th and 10th, 2022 Opinion exchange (June 13, 5th year of Reiwa)
- June 16th and 17th, 2023 Open House (January 24th 2024)
- 2024 31st and June 1st, 2020 Open House (August 9th 2024)
- 令和6年12月21日オープンハウス（令和6年12月21日公開予定）
About the house interim survey accompanying the Tokyo outer ring road project
Tokyo Gaikan Tunnel Construction Review Committee
- About the holding of the 23rd Tokyo Gaikan Tunnel Construction Review Committee (December 23, 3rd year of Reiwa) [PDF: 198KB]
- About the result of the 23rd Tokyo Gaikan Tunnel Construction Review Committee (December 24, 3rd year of Reiwa) [PDF: 176KB]
- About the holding of the 24th Tokyo Outer Ring Tunnel Construction Review Committee (June 1, 4th year of Reiwa) [PDF: 146KB]
- About the result of the 24th Tokyo Outer Ring Tunnel Construction Review Committee (June 3, 4th year of Reiwa) [PDF: 142KB]
- Holding of the 25th Tokyo Outer Ring Tunnel Construction Review Committee (October 25, 2020) [PDF: 272KB]
- Results of the 25th Tokyo Outer Ring Tunnel Construction Review Committee (October 28, 2020) [PDF: 212KB]
- Regarding the holding of the 26th Tokyo Outer Ring Tunnel Construction Review Committee (November 30, 2022) [PDF: 240KB]
- Results of the 26th Tokyo Outer Ring Tunnel Construction Review Committee (December 2, 2022) [PDF: 200KB]
- Regarding the holding of the 27th Tokyo Outer Ring Tunnel Construction Review Committee (May 26, 2023) [PDF: 169KB]
- Results of the 27th Tokyo Outer Ring Tunnel Construction Review Committee (May 31, 2023) [PDF: 183KB]
- Regarding the holding of the 28th Tokyo Outer Ring Tunnel Construction Review Committee (December 21, 2020) [PDF: 614KB]
- Regarding the results of the 28th Tokyo Outer Ring Tunnel Construction Review Committee (December 26, 2020) [PDF: 632KB]
- The 29th Tokyo Outer Ring Road Tunnel Construction Review Committee Meeting (April 25, 2024) [PDF: 726KB]
- Results of the 29th Tokyo Outer Ring Road Tunnel Construction Review Committee Meeting (April 30 2024) [PDF: 763KB]
- The 30th Tokyo Outer Ring Road Tunnel Construction Review Committee Meeting (September 9 2024) [PDF: 730KB]
- Results of the 30th Tokyo Outer Ring Road Tunnel Construction Review Committee Meeting (September 13 2024) [PDF: 390KB]
- 第31回東京外環トンネル施工等検討委員会の開催について（令和6年11月19日）【PDF：910KB】
- 第31回東京外環トンネル施工等検討委員会の開催結果について（令和6年11月22日）【PDF：899KB】
- Click here for past records
Briefing session on "recurrence prevention measures" and "future measures" for shield tunnel construction
- Information session from January 23 to February 1, 4th year of Reiwa (February 18th, 4th year of Reiwa)
- November 18-25, 2020 Open house (December 1, 2022)
- December 11-13, 2020 Open House (January 16, 2023)
- Open house from October 12th to 14th, 2020 (October 26th, 2020)
Related Links
Go to the Tokyo Gaikan Project website- Go to the website of the Tokyo Outer Ring National Highway Office, Kanto Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism
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