Chofu Road Collapse Announcement of Investigation Method Caused by East Nippon Expressway October 23, 17:53
On the 18th of this month, due to the problem of a road collapse in a residential area in Chofu City, Tokyo, the East Nippon Expressway, which was constructing a road deep underground in the vicinity, is conducting a boring survey to dig a hole to investigate the cause of the collapse. Announced that it will investigate the cavity with radar.
The East Nippon Expressway, which is constructing the "Tokyo Outer Ring Road" at a location deeper than 40 meters underground due to the collapse of the road in a residential area in Chofu City, Tokyo on the 18th of this month, has nothing to do with the construction. I don't know, but I've stopped working and started investigating the cause.
On the 23rd, the company explained the method of investigation at a press conference.
According to this, in a depressed residential area, a boring survey to dig a hole to a depth of 40 meters and a survey using sound waves will be conducted to investigate the geology and movement of groundwater in detail and to investigate cavities with radar.
At the press conference, Waseda University professor Atsushi Koizumi, who advises on the investigation, said that it is necessary to investigate the underground ground of the depressed place in detail, saying "I heard that it is a rare ground with a lot of sand and debris." I showed my thoughts.
In addition, the company says that it will investigate in detail whether there is any change in the height of the ground in the sections that have been dug so far.
Kenji Kato, General Manager of the Construction Division of the East Nippon Expressway Kanto Branch, said, "I will give a polite explanation to the local residents as soon as the cause is known."