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Shoddy tunnel work cause of road cave-ins in western Tokyo : The Asahi Shimbun


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. ....

Yuta Ichijo , Chuo Shinkansen , Takaoki Yamamoto , Kazuyoshi Akaba , Shinya Inazumi , Central Japan Railway Co , Shibaura Institute Of Technology , Nippon Expressway Co , East Nippon Expressway , Nippon Expressway , Linear Chuo Shinkansen , Central Japan Railway , Shibaura Institute , Mari Hirayama , Japan News , Social Affairs , Asahi Shimbun , சுோ ஷிங்கான்செங் , மைய ஜப்பான் ரயில்வே இணை , நிப்பான் அதிவேக நெடுஞ்சாலை இணை , கிழக்கு நிப்பான் அதிவேக நெடுஞ்சாலை , நிப்பான் அதிவேக நெடுஞ்சாலை , நேரியல் சுோ ஷிங்கான்செங் , மைய ஜப்பான் ரயில்வே , அரி ஹிராயமா , ஜப்பான் செய்தி ,