Although the well cover is not noticeable, its living environment is very bad. Located in the middle of the road, it is exposed to the strong and corrosive automobile exhaust every day. Heavy-duty vehicles repeatedly crush and vibrate hundreds of times. Moreover, the rain and sewage covered under it are also corrosive. Therefore, the working pressure of small well cover is very high.
At the same time, the responsibility of well cover is very important. Once the well cover is broken, there will be a great potential safety hazard. Especially in winter, several pedestrian accidents fall into the sewer every year in snow-covered cities in the north. There are tens of thousands of manhole covers in a city. The frequent replacement of manhole covers is obviously unaffordable for municipal expenditure. Therefore, the well cover must have a strong durability.
Because of these high standards, in history, well covers were usually made of metal, usually made of ductile iron, and some of them were made of expensive bronze for wear resistance。 Such a well cover is a good piece of metal, even if sold as scrap iron can be worth hundreds of dollars。 Therefore, although we must pay close attention to stealing wells, as long as the economic profits are in place, some people will take risks。
Others have tried to use less valuable materials to make well covers, such as putting steel cages in place first, then placing ordinary concrete on them to make reinforced concrete well covers. In this way, even if someone steals the well cover, only a little steel bar can be obtained in the well cover. The broken concrete is of no value.
However, ordinary reinforced concrete is far less tolerant to the environment than cast iron. If more than a few overloaded trucks run over, the well cover will be worn out. Therefore, such a concrete well cover will always show a broken image.
In addition, the binding of reinforcing steel cages and the pouring of concrete are cumbersome。 The price of such a well cover is sometimes higher than that of cast iron。
As a result, such concrete covers are rarely used, often forced to use cast iron covers.
This article is written by Shandong Ductile Iron Well Cover Manufacturer。 For more products and more details, please pay attention to our official website: http://www。jnwszy。com patronage is our great support。