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Boring inspection point where the third cavity was found = in Chofu city, Tokyo
The scale of the third cavity found on the 14th in the residential area of the city of Chofu, Tokyo, on the construction route of the underground tunnel of the Tokyo Outer Ring Road (Outer Ring Road) is about 10 meters long and about 4 meters wide. The depth was about 4 meters, according to a study of the operator’s East Japan Expressway. The company’s Kanto branch says, “It doesn’t affect the soil surface immediately, but we want to start filling the cavities as soon as possible.”
The site where the cavity was found is in Higashi Tsutsujigaoka Park 2 in Chofu City. In a boring investigation by the East Japan Expressway, it was found about 16 meters underground. Approximately 30 meters below, tunnel excavation work was being carried out with a huge protection machine with a diameter of about 16 meters until construction stopped immediately after the collapse of the city road in October. last year.
After the collapse, the first cavity found underground in November was about 30 meters long and the second cavity was about 27 meters long. Residents in the vicinity who heard an explanation about the third cavity from an East Japan Express employee looked scared, “Is it again?” “It’s scary to think that there might be a hole under my house.” Saying.
Hirosui Takigami, the representative of the “Chofu / Outer Ring Damage Residents Liaison Committee” who lives in the immediate vicinity of the site, said: “I am shocked and amazed that the depressions and cavities will continue to occur. Defects in the Highway Eastern Japan, as the shortcomings, are obvious. ” (Katsunori Hanai)
