How much money a sewage manhole cover

How much is a sewage manhole cover? The most critical factor is the life span of covers bearing his weight, bearing the weight off, however, covers it very easy to be crushed. Covers sales in the market, bearing the weight of the covers, there are different levels. Because different road vehicle traffic situations, so the covers bearing also have different requirements. To this end, the State Quality Supervision, Inspection and Quarantine and the Standardization Administration Committee in May 2009 issued a national standard covers of different materials. Green belt, sidewalks, motor vehicle lanes and other places made covers bearing the weight specification. But for this standard, many sellers have not been informed. ????? Water wells in accordance with how much a material, covers made of cast iron, resin, concrete and other several categories, resin cheapest, usually for the green belt, cast iron covers are most commonly used as a road price from a hundred to a thousand dollars, bearing the weight of the higher safety factor is higher, while the price is also higher. According to the seller for a maximum light covers sell, steal workers cast material are so light, buy Specifications 200 dollars. ????? Sewage covers much money a Afterward, the reporter visited several stores and found that the price of 200 dollars covers bearing standards of 20 tons, 36 tons of the fundamental standards of less than the state. Once applied these covers motorized vehicles, cars and trucks rolling through will soon become a pile of scrap iron, a security black hole will thus born. Professor Xing municipal Shandong Jianzhu University, said the general should be heavy test load of 360 kN is 36 tons, light should reach 210 kN is 21 tons so a load rating is considered acceptable. Like ten tons or less, these should be said is unacceptable.