How to buy steel bar grating
Steel grating selection regulations
4.3.1 The use of hot-dip galvanized steel structural steel gratings is preferred. In particular, steel gratings of stainless steel or other materials may also be used.
4.3.2 In order to ensure the overall rigidity and durability of the steel gratings, steel gratings produced by the pressure resistance welding process shall be selected.
4.3.3 Load flat steel center spacing: In addition to composite steel grating 40mm, others are used 30mm.
4.3.4, the center of the bar: 100mm (or 50mm).
4.3.5. The composite steel grid plate adopts a combination of 3mm pattern steel plate and a steel grid plate with a center spacing of 40mm in the flat steel.
4.3.6. When the platform has a high requirement for anti-slip performance, toothed steel gratings can be used.
4.3.7. Section modulus of steel gratings Calculated according to the loading flat steel, the composite steel gratings are based on the deformation coordination conditions of pattern steel plates and steel grating plates, according to the section modulus of the loaded flat steel and the section of the pattern steel plate covered thereon. The modulus calculates the load carrying capacity separately.
4.3.8 The deformation of the platform aisle steel grating under load shall not be greater than 1/200 of the span and shall not exceed 10 mm. Under 1.5 times the load, the steel grating will not be permanently deformed.
4.3.9 When the surface load is less than or equal to 4KN/?, G253/30/100FG should be used preferentially, and the spacing of support beams should be controlled within 1300mm.
4.3.10 When the surface load is greater than 4KN/? or there are special requirements of the site, the need to use other types of steel grating, according to Appendix A steel grating type and determine the maximum spacing of the support beam.
4.3.11. The type of steel gratings selected in the same project should be as uniform as possible, preferably one and not more than two; and when adopting steel gratings of two different heights, structural measures shall be taken to ensure tops thereof. Face on the same elevation.
4.3.12 When the opening width of the platform is greater than or equal to 400mm, additional structural trabecules shall be added along the opening to ensure the overall strength of the steel grating.
4.3.13. When the supporting beams are supported on both sides of the steel grating, the width of the top surface of the beams shall not be less than 60mm.
Steel grid typesetting
5.1. The typesetting design of steel gratings shall be carried out according to the components and openings layout of the steel structure platform.
5.2. The typographic design drawings on the manufacture shall conform to the design intent of the designer and be approved by the design unit before being manufactured.
5.3, the principle of typesetting:
