News

1. The allowable length deviation of steel grating is 0 ~ 5mm, and the allowable width deviation is ± 5mm.
2. The non perpendicularity of the load flat steel shall not be greater than 10% of the width of the flat steel.
3. Cross sectional area of cross bar: the cross bar is twisted square steel, and its cross sectional area shall not be less than 25mm; The cross bar shall be round steel or flat steel, and its cross-sectional area shall not be less than 16mm.
4. Position deviation of the cross bar: the upper surface of the cross bar shall not exceed the upper surface of the load flat steel by 1mm; Both ends of the cross bar shall not exceed the outer end face of the flat steel at both ends of the steel grating plate by 3mm.
5. Deflection and spacing deviation of cross bar: the deflection of the edge of the cross bar to the center of the steel grating plate shall not be greater than 5mm; Within any 1500mm length, the allowable deviation of the spacing between cross bars at both ends is 6mm.
6. Longitudinal bending: the longitudinal bending deflection of the steel grating shall not be greater than 1/200 of its length.
7. Transverse bending: the transverse bending deflection of the steel grating shall not be greater than 1/100 of its width.
8. Diagonal deviation: the diagonal deviation shall not be greater than ± 5mm.
In addition, the size of any steel grating shall take full account of the stress limit during the process of paving, hoisting and handling, and the size of the removable slab shall also take into account the weight limit of manual handling. Everything is based on reality.