| 摘要 |
<P>PROBLEM TO BE SOLVED: To dissolve the difficulty of detachment due to rusting of a contact part of a grating and a receiving frame, in a steel grating comprising a bearing bar, an end plate connecting the end part of the bearing bar orthogonally to the bearing bar, and a cross bar connecting the bearing bar in parallel with the end plate. <P>SOLUTION: A grating 1 installed to a square 8 comprises a frame 2, a bearing bar 3 in parallel with a long end plate 2a of the frame 2, a cross bar 4 in parallel with a short end plate 2b of the frame 2, and projection pieces 5a and 5b projected to the outer side from the respective long end plate 2a and the short end plate 2b of the frame 2. The projection piece 5a is projected so that a contour on the outer side is projected so as to protrude obliquely upwards as approaching the upper side, is in a form that an upper end is turned to an R shape, is at the same height as the bearing bar 3 by projecting the lower part from the long end plate 2a, and is supported by being abutted to a receiving frame 7 attached to an opening edge of the square. <P>COPYRIGHT: (C)2012,JPO&INPIT |
