Title:
EXTINGUISHMENT SYSTEM FOR TUNNEL
Document Type and Number:
Japanese Patent JP3106333
Kind Code:
B2
Abstract:
PURPOSE: To provide a tunnel extinguishment system not allowing water to be discharged without the actual release of a chain lock, even when the micro processing unit of a disaster prevention board or a relay board goes out of control.
CONSTITUTION: After determining a water discharge zone, MPU 20 of a disaster prevention board 3 sends a water discharge instruction signal to a relay board 4 via the first transmission cable. MPU 40 of the board 4 is thereby made to output an opening control instruction signal. Also, the transmission circuit 35 of the board 3 outputs a chain unlocking signal to the board 4 via the second transmission cable, upon receipt of a chain unlocking signal for releasing the lock state of an automatic valve. Also, a lock release judgement circuit 42 sends an automatic valve opening signal to an automatic valve control section 27, when an opening control instruction signal and a chain unlocking signal are issued respectively from the MPU 40 of the board 3 and a relay circuit 41.
Inventors:
Kenji Ishii
Toshihiko Shino
Toshihiko Shino
Application Number:
JP33738292A
Publication Date:
November 06, 2000
Filing Date:
December 17, 1992
Export Citation:
Assignee:
Nomi Disaster Prevention Co., Ltd.
International Classes:
A62C3/02; A62C3/00; A62C37/36; E21F11/00; G08B17/00; (IPC1-7): A62C37/36; A62C3/00
Domestic Patent References:
| JP4332569A | ||||
| JP1303164A |
Attorney, Agent or Firm:
Muneharu Sasaki (3 outside)