Steel bar grating trench covers are used in sidewalks, driveways, courtyards or the ground of buildings as cover plates for gutters, pipeline trenches, underground passages, air shafts, light wells, inspection wells or shafts and so on.
The steel grating trench cover usually consists of a fixed frame and a movable steel grating panels as the cover plate. The steel grating trench cover can be equipped with fastening devices or anti-theft devices.

Now we hereby brief you all on how many production steps should be strictly followed to manufacture our hot dip galvanized machine press welded steel gratings.
Step 1: Materials Preparation
Ready bearing bars and cross bars properly for Step 2.
Step 2: Bearing Bars Placement
Place bearing bars into a work-holding device that is suitable for holding bearing bars in place.
Step 3: Pressure Welding
This step involves cold pressing of cross bars into bearing bars at high pressure and resistance welding of the bar materials under great pressure at high temperature. In this step, a moving fixture is responsible to safely carry cross bars into place, where a manipulator will grip cross bars firmly and immediately once they are in the right position, and then the press welding operation follows instantly.
Step 4: Flush Trimming for Edges
Flush trimming is designed to remove the excessive portion of cross bars that extends beyond the edges of the grating panel.
Step 5: Cutting to Size and Shape
Cut to size and shape in strict accordance with the desirable dimensions and shapes provided for by the working drawings of the buyer.
Step 6: Banding for Open Ends
Banding is a welding process that closes open ends of bearing bars, and the line of cutouts if any, of the grating panel. As a rule, banding bars are the same as bearing bars in thickness and height, however if banding bars serve as the load carrying bars or other special purposes, and the buyer's working drawings prescribe otherwise, then the buyer's working drawings shall prevail.
Step 7: Hot Dip Galvanizing
Once the banding process is complete, the grating panels should be finished by using the hot dip galvanizing process.
The zinc coating thickness is usually 65 μm or above, which is enough to resist corrosion for 15-30 years in harsh conditions.