About falling concrete piece from Yokohama Yokosuka Road Hosen viaduct

NEXCO EAST Kanto Regional Head Office (Taito-ku, Tokyo) manages the Yokohama Yokosuka Road Hosen viaduct in a passage (width about 1.5m) parallel to Yokohama Yokosuka Road. A piece of concrete was found that fell from the underside of the bridge pier.

No accidents such as injuries or property damage have been confirmed.

We take this situation seriously, carry out emergency inspections, and implement measures to ensure safety.

1 History of discovery

Monday, September 26, 2011 11:12 am

The request from the Keihin management office of our company was confirmed by an employee of our company on site, stating that there is a concrete piece that seems to have fallen from the viaduct on the Yokohama Yokosuka Road, so I would like to inspect it.

2 Occurrence location

Yokohama Yokosuka Road Hosen Viaduct (Opening date: March 31, 1981)
Address: 1 Gonta-zaka, Hodogaya-ku, Yokohama City, Kanagawa Prefecture

3 Falling concrete pieces

Maximum about 11 cm x about 8 cm x about 2 cm
Total weight including other fragments About 0.3 kg

4 Cause of fall

Currently under investigation.

5 Last inspection date of the location

April 2011 No abnormality

6 Future action

An emergency inspection of the relevant part was completed on the night of yesterday (9/26).

In the future, for bridges under the jurisdiction of the Regional Head Office, an emergency inspection of bridge piers, which may cause damage to a third party due to similar events, is planned.

[Situation photo]