Emergency inspection of tunnel ceiling panels in NEXCO EAST
December 3, 2012
East Nippon Expressway Co., Ltd.
We would like to pray for the souls of those who died in the accident of the collapse of the tunnel ceiling panel in NEXCO CENTRAL, and we would like to express our sincerest sympathies to the bereaved families.
NEXCO EAST, "Emergency inspection of tunnel ceiling board" from the Ministry of Land, Infrastructure, Transport and Tourism
We are conducting an emergency inspection as follows based on the instructions.
1. Tunnel to be inspected
Expressway, which is managed and operated by NEXCO EAST, does not have a tunnel with a ceiling plate installed over the entire extension. In the tunnel to be inspected this time, a ceiling plate is partially installed at the place where ventilation equipment such as a dust collector is installed.
| No. | Admin | Route name | Tunnel name | Up and down Another |
tunnel Extension (km) |
Of which ceiling plate Installation extension (km) |
Remarks |
|---|---|---|---|---|---|---|---|
| 1 | NEXCO East Japan |
Kan-Etsu Expressway | Kanetsu tunnel | In-bound line | 11.1 | 0.17 | |
| 2 | Out-bound line | 10.9 | 0.15 | ||||
| 3 | Hokuriku Expressway | Nou tunnel | Out-bound line | 3.0 | 0.02 | ||
| 4 | Takamine tunnel | Out-bound line | 3.1 | 0.02 | |||
| 5 | Child ignorance tunnel | In-bound line | 4.6 | 0.05 | |||
| 6 | City swing tunnel | Out-bound line | 3.3 | 0.05 | |||
| 7 | Aqua Line | Tokyo Bay Aqua Tunnel | In-bound line | 9.6 | 0.30 | ||
| 8 | Out-bound line | 9.6 | 0.30 | ||||
| 9 | Nagano Road | Tachitoge tunnel | Out-bound line | 3.6 | 0.02 | ||
| 10 | Joshin-Etsu Expressway | Gorigamine tunnel | In-bound line | 4.5 | 0.04 | ||
| 11 | Happu-san tunnel | Out-bound line | 4.5 | 0.05 | |||
| 12 | Taro mountain tunnel | In-bound line | 4.3 | 0.02 | |||
| 13 | Ken-O Road | Sugawa Tunnel | In-bound line | 2.4 | 0.04 | ||
| 14 | Out-bound line | 2.4 | 0.04 |
(11 tunnels: 14 tubes, inspection target extension 1.3km)
2. Inspection method and contents
Ministry of Land, Infrastructure, Transport and Tourism "Emergency inspection of tunnel ceiling boards"], The inspection by close visual inspection, tapping sound, and palpation is carried out with the following contents.
- (1) Ceiling board suspension fittings and fixing fittings
- (2) Soundness of the lining concrete near the fixed parts of the ceiling plate suspension fittings and the pedestal
- (3) Presence/absence of deformation or damage to the ceiling plate
- (4) Presence of other events that may lead to the fall of the ceiling plate, etc.
- Before inspection, make sure to pay attention to the condition of the ceiling board and traffic conditions in advance to prevent accidents.
3. Inspection completion time
Scheduled to be completed on Wednesday, December 12, 2012
[Reference] Photograph of the current inspection status (near the ventilation station on the Kan-etsu tunnel In-bound line of the Kan-Kan-Etsu Expressway)
Ceiling board installation status
Download large image [JPEG: 1.7MB]
Tapping and palpation inspection status
Download large image [JPEG: 1.4MB]
Download large image [JPEG: 1.7MB]