| 摘要 |
A grating 2 is provided with main bars 20 that have a plurality of through-holes 204 with prescribed gaps therebetween in the longitudinal direction and that are arranged in parallel and at the same height with prescribed gaps therebetween; connecting bolts 22 that have a rectangular shape in which the cross-sectional shape is longer in one direction and that pass through each of the through-holes 204 in the main bars 20 in such a manner that they do not rotate in the circumferential direction by arranging the cross-sectional shape to be longer in the vertical direction; spacers 21 through which the connecting bolts 22 pass and that are disposed between the main bars 20; and nuts 24 that are provided at one end or both ends of the connecting bolts 22 and that, by being tightened, secure the main bars 20 to the connecting bolts 22 with prescribed gaps therebetween. |
