TUNNEL DISASTER PREVENTION FACILITY

To solve problems for example, in a water spray facility provided as a tunnel disaster prevention facility, an insect or dust may enter from a water spray hole of a water spray head, and depending on a surrounding environment condition such as presence of an exhaust gas of a car, a metallic pipe or a spray hole is subjected to decay, and a prescribed water sprinkling performance may not be maintained, and as for the countermeasure I which a dust proof cap is fitted to the spray hole and a water spray facility is actuated, manual fitting work is required and after the water spray, furthermore, since many water spray heads are provided in a tunnel, labor and time are required for fitting works, in addition, water spray is performed not only in fire disaster and but also in inspection, and in fitting work of the water spray head in inspection, sometimes, road block or traffic regulation may be required.SOLUTION: In a normal state in which water is not sprayed, a gas such as air is discharged from a spray hole so that an insect, dust, and an exhaust gas are prevented from entering a water spray head 22.SELECTED DRAWING: Figure 1 【課題】トンネル防災設備として設けられている水噴霧設備は、水噴霧ヘッドの水噴霧口から虫や塵埃が入る可能性がある。また、車の排気ガス等の周囲の環境条件によっては金属製の管や噴霧口が腐食し、所定の散水性能を維持し得ない虞がある。噴霧口に防塵キャップを装着すると、水噴霧設備が作動して噴霧が行われた後に、人手による取り付け作業が必要である。水噴霧ヘッドはトンネル内に多数設けられるため、取り付け作業には労力と時間を要する。また、噴霧は火災時だけでなく、点検時にも行われる。点検時の水噴霧ヘッドの取り付け作業の際には、車の通行止めや、通行規制を要する場合もある。【解決手段】水を噴霧していない通常時に、噴霧口から空気等の気体を放出し、虫や塵埃、排気ガスが水噴霧ヘッド２２に入らないようにする。【選択図】 図１