Steel Grating Design Details on Daily & Industry Applications
The metal bar grating stairs tread should be reinforced well with fix clips.
The designs for the steel grating are about various aspects, the platform, the corridor and the gully cover. These detail designs could make sure that the steel grating is safe and the finished product is convenient and durable.
The steel grating platform and the corridor.
The platform and the walkway design should avoid the danger from the falling objects.
- To avoid the danger that the objects fall from the platform or the corridor, there should be not gap that is bigger than the clearance on the platform and the corridor.
- The clearance for the platform and the corridor should be less than 35 mm and could prevent the ball falling through the gap.
- If there are people working on the platform, the gap should not be more than 20 mm. The ball with 20 mm diameter should not fall through the gap on the platform and the corridor.
The platform and the corridor design should avoid the passerby tripping.
To avoid the passerby ripping, the steel grating should be flat. The height difference among the adjacent steel gratings, steel grating and the structures should not be more than 4 mm.
The platform and the corridor design should avoid the steel grating falling.
- We had better weld the steel grating to install the steel grating. This installation way could avoid the steel grating falling.
- We install the steel grating according to the steel structure panel. We could mot move or break away from the support frame after the installation. The support length for the bearing bar on the support frame should be more than 25 mm.
- The steel grating that needs move and tear down should be reinforced with the fix clip. The fix clip could avoid the movement for the structure and the clip choice should according to the needs. The carbon steel clip should be coated with hot dipped galvanized. The stainless steel fix clip dose not need coating. The bolt for the fix clip should be dipped with galvanized coating. The bolt diameter should not be less than 8 mm. There should be at least four fix clips for the steel grating.
- We should inspect for the steel grating all the time to find the corrosion or the dangerous loose for the steel grating.
The steel grating design should avoid the passerby slipping.
The steel grating should have nice slipping resistance. For the platform that the slope degree is more than 10° and there is liquid or oil stain, we should use the steel grating with serrated edge. When the slop degree of the platform is more than 10° we should strengthen the slipping resistance.
The steel grating platform and the corridor size.
- The width for the steel grating single corridor should be more than 600 mm. When there are many people go pass the steel grating corridor the width should be 1200 mm.
- If the steel grating is to be the escape route the width should follow the particular laws requirement. If there is not the laws then the width should be more than 1200 mm.
The steel grating platform and the corridor design loads.
- For the platform that only one person work the design loads should be 1.5 kN and loads area is 200 mm × 200 mm.
- The loads for the service platform is averaged by 4 kN/m2.
- The average loads should be more than 3.0 kN/m2 for the single passing steel grating corridor.
- The average loads should be more than 5.0 kN/m2 for the double passing steel grating corridor.
- The average loads should be more than 7.5 kN/m2 when the people are dense on the steel grating corridor.
- The deflection should not be more than the 1/200 of the span when the steel grating is with design loads. The height difference for the steel grating with loads and the steel grating without loads should not be more than 4 mm.
The convenience for the steel grating stair treads.
The stair treads which is made by the steel grating should meet the above detail design. The installation for the stair tread should be firm enough. We should also consider the convenience design for people to pass.
The steel grating corridor and the gully cover design.
There are many places that use the steel grating gully cover, sidewalks, roadway, parking lot, wharf and the building floor. For the loads and the car direction are totally different, the steel grating gully cover should be designed one by one.
We should consider the wheel pressure and the impact for the steel grating gully cover that is used on the roads. The steel grating gully cover should avoid the danger from bouncing. The gully cover should be reinforced with the support frame.