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Residents reading a protest statement in a park where a third cavity was confirmed = in the city of Chofu, Tokyo
In response to the discovery of a third cavity in the ground at Higashi Tsutsujigaoka, Chofu City, Tokyo, on the Tokyo Outer Ring Road (Outer Ring Road) Underground Tunnel Construction Route The “Kai” co-representatives / Chofu “held a press conference in the park on the 15th to protest the successive depressions and cavities.
◆ 16 m underground, 10 m long, 4 m wide and deep
Haruyo Kikuchi, one of the co-representatives, read a statement that said: “Careless construction management forces us every day to feel fear and anxiety that the ground under our feet may begin to crumble.” A second cavity was found in the ground next to Mr. Kikuchi’s house in November last year.
On the same day, the operator’s East Japan Expressway announced that the size of the third cavity was about 10 meters long, about 4 meters wide and about 4 meters deep. As a result of a boring survey conducted in the park, it was found about 16 meters underground.
The company explained: “It does not affect the soil surface immediately, but we would like to start filling the cavity as soon as possible.”
The statement noted that “the cause is no longer clear” because both the depression and the cavity occurred directly above the tunnel excavation work by the huge shield machine. After that, he appealed: “Please restore the area’s land. Promise the residents a safe life in the future eternal area.”
The association sent five requests to the Ministry of Land, Infrastructure, Transport and Tourism and the East Japan Highway, including the investigation of the cause of the accident by a third-party committee and the restoration of the land to its original condition. The application was signed by 112 residents who suffered damage such as damage to their homes.
Around the site, three gas leaks have been confirmed since December last year from an underground pipe about 1.2 meters underground, and Tokyo Gas has been restored through emergency construction. The company says: “The causal relationship with the construction of the underground shield is unknown.” (Katsunori Hanai)
