A new cavity near the collapse site in a residential area in Chofu, Tokyo To an additional survey on November 5, 18:55
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Last month, it was revealed on the 4th that a new cavity was found near the site of a road collapse in a residential area in Chofu City, Tokyo.
The East Nippon Expressway, which is constructing a road tunnel deep underground at the site, held a press conference and explained that the situation of the cavity and additional investigation would be carried out.
In a residential area in Chofu City, Tokyo, a road collapsed last month, and when we were investigating the cause of the East Nippon Expressway, which is constructing a tunnel for the "Tokyo Outer Ring Road" deep underground, 40 meters north of the collapse site. It was revealed on the 4th that a new cavity was found in.
The cavity extends below 5 meters deep from the surface and is 4 meters wide, 30 meters long and 3 meters high.
The East Nippon Expressway was examined by the Countermeasures Committee on the 5th, and after the end, the person in charge and an expert held a press conference and explained the state of the cavity, etc. after not knowing the relationship with the tunnel construction.
According to it, there was a hard ground between the ground surface and the cavity, and it was not in a state of immediately changing the ground surface, and there was groundwater about 1 meter deep in the cavity.
Professor Atsushi Koizumi of Waseda University, who is the chairman of the committee that examines countermeasures, said, "Since the location of the cavity is close to the river, it is possible that groundwater from the river flowed in and caused the formation of the cavity. It is necessary to examine the flow and determine whether the cause of the cavity is the original ground or the effect of construction. "
In addition, Chairman Koizumi pointed out to the East Nippon Expressway that a detailed investigation should be conducted this time, saying that the collapse site last month was filled up immediately and a detailed investigation could not be conducted.
Regarding this, the East Nippon Expressway said, "Given the anxiety of the residents, it is not possible to leave the cavity as it is for the investigation," and expressed the idea of urgently backfilling work.
The East Nippon Expressway will measure the direction and speed of groundwater flow and confirm the relationship with the river within a few days until the backfilling work is ready.
In addition, we will increase the number of boring surveys that investigate the ground conditions in the surrounding area from 8 to 10, and will respond individually if there is a request from the residents.
Kenji Kato, General Manager of the Construction Division of the East Nippon Expressway Kanto Branch, said, "We have been promoting our business with the highest priority on the safety and security of our lives, but now we are in an uneasy state, so we will dispel the anxiety of the residents. ) I want to work hard. "
The East Nippon Expressway will hold a briefing session for local residents from the 6th.
Residents "Clearly related to tunnel construction"
Following the discovery of a new cavity in a residential area in Chofu City, Tokyo, local residents have expressed anxiety and asked to clarify whether it has a causal relationship with tunnel construction.
Haruyo Kikuchi, who lives near the newly found cavity, said, "I was surprised. I thought that it was a land that I couldn't continue to live in even though I liked it and lived there. I'm doing it. "
The causal relationship with the tunnel construction is unknown, but according to Mr. Kikuchi, cracks in the fence have been confirmed at home and in the surrounding houses since the construction began.
After the 6th, Mr. Kikuchi made a document summarizing the situation such as depressions and cavities for the residents' briefing sessions held by the national government and the East Nippon Expressway, and on the 5th, he visited neighboring houses and called for participation.
The woman who received the materials said that her home was right next to the cavity and right above the tunnel, and she said, "I'm afraid that there is a cavity and my legs are shaking. I'm worried that it may extend under my house. And when I go to bed, I can't sleep with just a little noise. "
On top of that, it's not a problem that you can say, "I'm glad that no one was killed or injured because there is a place for children to play nearby. We don't know what's going on underground, so the country. I would like the companies and businesses to do more research and disclose the data firmly. "