1, the anti-theft performance is very strong, it is unlike the District Office Park, there is not so much a camera, only in the key place for the camera, if some people want to deliberately malicious mischief, in the dead time, the ductile iron manhole cover is opened, and then cut the wire inside。 It will be a huge loss, planners are considering this point, if not professional, is not about the manhole cover open。
2, very smooth, in place, its surface and ground is flat, which ensure that the vehicles in the above time there will be a lot of bumps, children walking time is not to worry about falling,
3, non slip ductile iron manhole cover surface has peculiar slip pattern is important in order to increase the friction, prevent rain, snow and ice covered so that pedestrians slipping.
4, anti knock the manhole cover and the well ring surface for war machine, make it more in line with the abnormal sound. In order to prevent the total noise.
5, the anti displacement well ring and a solid ground anchor bolt, the check of ductile iron manhole covers in the construction, not well mouth fault caused by circle roller compaction, in order to reach the scale of construction。
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