Problem to be solved: to open the door of the extinguisher box from the road side and the monitor passage side and to easily and easily take out the extinguisher.A fire extinguishing box 20 is embedded in the monitor passage 14 along the tunnel wall, and a extinguisher is housed in the monitor.A front door 30 made up of a fixed door 35 and two slide doors 36a and 36B is disposed on the front surface of the extinguisher box 20 which is a side of the road 15 so as to be able to slide and open vertically.The upper door 32 is disposed on the upper surface of the extinguisher box 20 serving as the operator's passage 14 so that the upper door 32 can be opened and closed.In the case of operating from the side of the road 15, the front door 30 is disengaged from the front door 32 to release the front door 30 to open the slide doors 36a and 36B by sliding down, thereby removing the extinguisher 50.When the operator is operated from the monitor passage 14 side, the upper door 32 is opened to take out the extinguisher 50.Diagram
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