| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate the entrance/exist of a worker into/from an underfloor space.SOLUTION: A double floor structure 10 includes: a floor slab 28; a double floor F which is arranged on the upside of the floor slab 28 and which forms a maintenance space M between itself and the floor slab; and a reversed beam 20 which protrudes into the maintenance space M from the floor slab 28, which supports the double floor, and in which an opening 60 penetrating in a beam width direction is formed.</p> |
