Usually, the most common type of road surface is the circular one. This is because the circular manhole cover is more stable than the square, and it is not prone to the phenomenon of incline. It can better protect the safety of pedestrians and vehicles.
The more deep reason is that the round Shandong ductile iron shaft cover is the same as each diameter of the center of its circle, so that when the car is rolled up, the diameter of the well cover will be slightly wider than the well head below, and it will not be dangerous to the well head.
In fact, the shape of the ductile iron shaft cover also involves the problem of the utilization ratio of a material。 Because the use of the well cover depends on the size of the wellhead, if it is not necessary to install a square well cover far beyond the wellhead, the use and practical value of the material is obviously not suitable for the direct use of a circular spheroidal graphite cast iron cover。
Since the square spheroidal graphite cast iron shaft cover is designed, it shows that it has a specific application range, that is, the use of rural and cable wells. The square spheroidal graphite cast iron well cover can better prevent water from entering the water, so as to prevent the cable from being immersed in water.
1, ductile iron shaft covers are often in the roads, corridors, living quarters and other vehicles and frequent activities。 Once the quality problems of cast iron well cover or the loss of cast iron cover are lost, it is very easy to cause safety accidents。
2. At present, the management of the cast iron shaft cover is confused. Once the cast iron shaft cover is damaged or stolen, it is often unable to replace or fill in time. It also makes the hidden danger of safety can not be eliminated in time. Based on the above two aspects, the survey found that in recent years, people have tried all kinds of ways to solve the problem of cast iron well cover. The focus of these methods is not two aspects, one is theft, and two is the time of theft.
3, the safety hidden danger of the shaft cover has not been solved for many years, and the weakest link in the road construction is the inspection of the cast iron shaft cover of various pipelines. The inspection of the smooth connection of the cast iron shaft cover and the road surface has buried many hidden dangers to the quality of the road engineering, and the light causes the damage of the road, and the heavy subsidence of the cast iron shaft cover, which results in the large subsidence of the cast iron shaft cover. The occurrence of a traffic accident.
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