1。 Anti theft: put the anti-theft box under the well ring, open the flap of the well cover, and do not use the anti-theft chain, but the anti-theft effect is better, and the rust problem is solved.
2。 In order to prevent falling, the manhole cover needs to be provided with anti falling grille. If there is no object on the manhole cover, it can avoid personal injury caused by falling or other objects on the manhole cover.
3。 In order to prevent displacement, the well ring is fixed with anchor bolts, and the small round hole in the middle plays a fixing role. After the construction of the well cover, the well ring will not cause any wrong mouth. Whether it is rolling or automobile rolling, it meets the construction standards.
4。 In order to prevent noise, in order to make the contact surface between the nodular cast iron round cover and the well ring more consistent, it should be processed so that there will be no abnormal noise when the car returns to pass through the well cover.
5。 Anti slip, the surface of manhole cover shall have diamond pattern to prevent sliding. A ring to ring connection structure is required. At the same time, the wear-resistant coefficient of the ring mouth surface, T-shaped protrusion and the wear-resistant coefficient of asphalt base material and ring mouth shall be increased
① The use area is different. Light nodular cast iron manhole covers are suitable for residential areas, squares, greenways or parks. Heavy duty ball milled cast iron manhole covers, such as those of Hunan Zhenjin, can be used in expressways, roads or docks because of their high load-bearing.
② Material. In addition to ball milled cast iron, some light nodular iron well covers will add resin and other materials. The heavy nodular iron manhole cover needs nodular cast iron to achieve a certain strength.
③ Specifications. The thickness of light nodular iron manhole cover is thinner than that of specific gravity nodular iron manhole cover.
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