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JR not on board with preserving historic railway embankment : The Asahi Shimbun asahi.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from asahi.com Daily Mail and Mail on Sunday newspapers.
Shoddy tunneling work is being blamed for a series of cave-ins in busy Chofu city, western Tokyo. An experts’ panel set up by East Nippon Expressway Co. explained in a report released Feb. 12 that the company had been tunneling deep underground for its Tokyo outer ring road when a number of cave-ins occurred and huge cavities formed. According to transport ministry officials, this is the first such instance in connection with a law that took effect in 2001 related to the usage of underground areas at great depths. The report found that heavy bore machinery encountered difficulties tunneling into the bedrock. Chemicals were poured into the site to facilitate the work. But that led to the machinery excavating an excessive amount of dirt and creating cavities in the area above the machinery that formed the uppermost section of the tunnel. ....