When we use the theme covers, there will be a variety of styles, we need to solve. For cast iron covers appear common problems, we have a corresponding response. Knowledge we do not quite understand it, for example, encountered the phenomenon of stolen covers we have to do with it.

First, ductile iron covers are often located in the road, corridor, living area and other vehicles traveling, frequent personnel activities in the area, once the quality of cast iron covers (damaged, improper construction) or cast iron covers lost theft, easily lead to accidents, the right Our safe travel has had a huge impact.

Second, there was a time when a large area of cast iron manhole covers stole the incident, causing a very bad effect. There is the management of cast iron covers confusion, once cast iron covers damaged or stolen, often can not be replaced or fill in time, but also makes the hidden dangers can not be promptly eliminated. Based on the above two shortcomings, the survey found that in recent years, people tried their best to solve the problem of cast iron covers, these methods focus on nothing more than two aspects, first, anti-theft, and second, once stolen fill vacancies.

Third, the hidden dangers of manhole cover have not been solved for many years, and the weakest link of the road construction is the inspection of cast iron manhole cover of various pipelines. Checking the smooth connection of cast iron manhole cover and the road surface has buried many hidden dangers to the quality of road works, Causing road damage, heavy inspection of cast iron manhole covers a substantial subsidence, resulting in traffic accidents.