| 摘要 |
PROBLEM TO BE SOLVED: To provide a grating having a cross bar improving the reliability of the connection of a bearing bar at a low cost without performing twist processing. SOLUTION: A grating 40 has a plurality of bearing bars 10 arranged at a regular interval and in parallel and the cross bar 20 of non-twist structure joined on the bearing bar 10 arranged orthogonal to the bearing bar 10. A projection 21 is intermittently formed on the upper surface 20a of the cross bar 20 in the longitudinal direction.
|
