Corroded connectors may be to blame for tunnel collapse in Japan

12/4/2012 | Yomiuri Shimbun (Japan)

Experts say connecting hardware corroded and weakened by decades of seeping groundwater, acidic exhaust gases and vibration may have given way in the Sasago Tunnel in Japan last weekend, causing more than 270 tons of concrete panels to collapse onto the roadway below. The disaster occurred only days after officials of Nippon Expressway Co. set up a committee to find the best ways to address deterioration caused by aging in tunnels and other structures.

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Yomiuri Shimbun (Japan)

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