| 摘要 |
PROBLEM TO BE SOLVED: To facilitate replacement of a fire detector and realize easy and sure waterproofing. SOLUTION: A fire detector for a tunnel is provided with fitting parts 12 having a screw hole and projecting at two or more positions around a detector body 2b, and fastening parts 13 lowered toward the detector body 2b and having through-holes 13a for screws around a cover 2a of the detector body 2b. The fastening parts 13 are provided with a fitting screw hole 13a, through which a screw is screwed into the fitting part 12 to be fixed with a screw head being positioned below the surface of the detector. Projections 16 thrusting over the position to cover both sides of the screw head are formed on the fastening parts 13 provided around the cover 2a. COPYRIGHT: (C)2005,JPO&NCIPI
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