Improper shipment by ready-mixed concrete maker Investigating whether it is used in about 70 buildings or not

It is suspected that a concrete manufacturer in Kawasaki City shipped a product that does not meet the JIS = Japanese Industrial Standards mixed with another concrete and used it in about 70 buildings of seven local governments such as Kawasaki City and Tokyo. I found it in a survey of countries.

There is a possibility that some buildings do not meet the Building Standards Law, and the national and local governments are investigating whether there are any safety issues.

According to the Ministry of Land, Infrastructure, Transport and Tourism, buildings in Kanagawa Prefecture and Tokyo that use concrete manufactured by Kawasaki City's manufacturer "Kojima Kenzaiten" may not meet the legal standards.

Concrete before it hardens is called "ready-mixed concrete", and the Building Standards Law stipulates that it conforms to the JIS = Japanese Industrial Standards, which in principle deliver to the site within one and a half hours after manufacturing.

However, the JIS certification was revoked in February, alleging that the contractor had repeatedly improperly shipped the old product left over at the construction site into the new product.

After that, when the Ministry of Land, Infrastructure, Transport and Tourism investigated the actual situation, it was found that there was a suspicion that concrete was used in about 70 buildings in 7 cities and wards such as Kawasaki City, Yokohama City, Tokyo Fuchu City and Setagaya Ward. rice field.

Of these, Kawasaki City has the largest number of about 50 buildings, most of which are detached houses.

It means that some of the buildings under investigation cannot be handed over to the residents even after the deadline has passed.

The national and local governments are investigating how concrete was used and whether the strength of the building is insufficient.

Kojima Kenzai store commented to NHK's interview, "We apologize for the inconvenience caused to the people concerned. We are currently taking measures including fact checking."

Some houses cannot be delivered

Approximately 70 buildings that may have used concrete that does not meet the standards of the Building Standards Act have been confirmed in seven cities and wards in Kanagawa Prefecture and Tokyo, and local governments are investigating whether there are any safety problems. increase.

The largest number is about 50 in Kawasaki City, and 4 in Yokohama City.

Most of the buildings in Kawasaki are detached houses.

In Tokyo, 14 buildings from 5 local governments are surveyed, 6 in Fuchu City, 3 in Setagaya Ward, and 3 in Machida City.

It means that some of these houses cannot be delivered.

In addition, at least one building was confirmed in Komae City and Inagi City.

Of these, it was confirmed that concrete that did not meet the standards of the Building Standards Law was used for the foundation of the house in three buildings in Machida City. The policy is to instruct them to be certified by the Minister of Land, Infrastructure, Transport and Tourism after confirming that there are no problems.