1。防盜：將防盜盒放在井圈下面，打開井蓋的翻蓋，不要使用防盜鏈，但防盜效果更好，生銹問題也解決了。
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。為防止墜落，人孔蓋內需要有防墜落格柵。如果井蓋沒有蓋上或丟失，可以避免人員或其他物體墜落造成的傷害。
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。為防止位移，用地腳螺栓固定井圈，中間的小圓孔起到固定作用。井蓋施工后，井圈不會造成任何錯口，無論是滾軋還是汽車滾軋，都符合施工標準。
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。為防止噪音，為了使球墨鑄鐵圓蓋與井圈的接觸面更加一致，應進行加工，使汽車返回通過井蓋時不會有異常噪音。
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。防滑，人孔蓋的表面應有菱形花紋，以防止滑動。需要使用環和環之間的連接結構。同時，應增加環口表面的耐磨系數，增加T型突起，增加瀝青基料和環口的耐磨系數
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使用區域不同。輕型球墨鑄鐵井蓋適合在小區、廣場、綠道或公園等區域。重型球磨鑄鐵井蓋，像是湖南甄金的球鐵井蓋，就可以在高速公路、馬路或者碼頭使用，因為它的承重較高。
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材質。輕型球鐵井蓋除了球磨鑄鐵材料外有些會添加樹脂等其他材料。而重型球鐵井蓋需要使用球墨鑄鐵，才能達到一定強度。
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規格。輕型球鐵井蓋厚度比重型球鐵井蓋厚度薄。
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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