Kan-Etsu Expressway For falling concrete fragments from the Tonegawa Bridge
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NEXCO EAST Kanto Regional Head Office (Taito-ku, Tokyo) manages Kan-Etsu Expressway 's Tonegawa Bridge, where concrete pieces fall onto the site of Expressway. Did. No damage such as injuries or property damage has been confirmed.

We immediately perform an emergency inspection of the relevant part after confirmation to confirm that there is no problem with safety. We apologize for any inconvenience caused to our neighbors.

1 History of discovery

The 1st report to our company At about 11:00 on February 15, 2013 (Friday), we were informed that an adjoining golf course member found a concrete piece, and our employee entered the site confirmation from that day. , The damaged area was identified on Saturday, February 16th.

2 Occurrence location

Kan-Etsu Expressway Tonegawa Bridge (104.5KP) First-class river Tonegawa and intersection
(Between Ikaho Shibukawa interchange and Akagi interchange, opened on October 2, 1985)
Destination name: Nakamura, Shibukawa City, Gunma Prefecture (Gunmaken Shibukawa Nakamura)

3 dropped concrete pieces

Dimensions about 23 cm x about 13 cm x about 1 cm (about 600 g)

4 Cause of fall

It is highly probable that rainwater invaded due to aging of the concrete and the reinforcing bars corroded and expanded, causing the concrete to peel off and fall.

5 Inspection history of the location

Inspections were carried out from October 10 to 11, 2012, and minor damage was confirmed.

6 Response status at the relevant location

Due to the occurrence of an event, an emergency inspection of the bridge was conducted from February 15th to 17th, and we confirmed that there was no problem in safety.

[Situation photo]