Trench cover is mainly used in a number of factories and high-end residential use, mainly because the cement trench cover is often crushed, roads were damaged. Therefore, the use of steel grating trench cover made to fit different truck load. Since the trench cover simple construction, light weight, carrying, impact, rather bend do not break, the displacement of large, after galvanizing beautiful and durable, corrosion, has incomparable advantages of cast iron cover. And the use of a hinge or hook-link connection, etc., easy to open, and with anti-theft feature. In factories and some high-end cell widely used. Since 2000, China's trench cover market can be said to become more widely used in some municipal roads, garden facilities, residential quarters, schools, stadiums, factories and construction sites have different applications. National Off steel grating class product design requirements, its steel grating steel grating class products and related instructions.