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Manhole cover inspection standard
2014-03-25 15:33:39 From: admin

Xushui cast iron manhole cover manufacturers are universal in the world and approved by CEN (Drainage Equipment Technical Committee) on June 6, 1994. They are applicable to various material manhole covers. It regulates that the standard is an undisputed world standard in any case. . Countries outside Europe also implement the standard, indicating the advanced and authoritative nature of the standard

The load levels are all regular, the scale of application is clear, and the interval of Chinese standards can be clearly seen against Chinese standards. In fact, all kinds of manhole covers produced according to Chinese standards cannot meet the requirements of European standard EN124. Therefore, all companies exporting manhole covers in China produce in accordance with EN124 when exporting manhole covers.

Although the heavy and light grades are only briefly distinguished, the heavy-duty manhole cover test load of 360 kN is close to the D124 of EN124 suitable for various motor vehicles. More than ten years of practice have proven that manhole covers that reach this load are safe for use on the road.

Ordinary manhole covers with a regulatory test load of only 100 kN can be suitable for "passage or parking places for vehicles of Class 10 and below". The test load of 240 kN heavy manhole cover and EN124 C250 and CJ / T 3012-93 light manhole cover test load are appropriate, but it can be suitable for "motor vehicle trek, parking distance, place". The test load policy of the manhole cover on the motorway is reduced, the bearing capacity of the manhole cover is naturally reduced, and hidden safety hazards exist.

The cast iron manhole cover has a reasonable bearing capacity (36 t) for heavy manhole covers, and is close to the D400 manhole cover (40 t) of EN124. When the light manhole cover (21 t) prevents motor vehicles from trekking, there is a surplus of talents that can be carried. It should be divided into several levels like the EN124 standard, which will be more reasonable and economical to use. According to the standard of Recycled Resin Composite Manhole Cover, the bearing capacity of heavy-duty manhole covers is only 24 t, which must be impossible. The “fracture load” of A-type manhole cover of “Steel Fiber Reinforced Concrete Manhole Cover” is only 18 tons, and the policy is serious and low. Although there are three standards in China, all three standards have certain restrictions, and they cannot include existing manhole covers of various materials. The bearing capacity of the manhole cover is a key policy for measuring whether the manhole cover can be used on the road. If the bearing capacity is not high, it is no different from the theft of the cast iron manhole cover when it is crushed during use. Therefore, no matter what kind of material is used as the manhole cover, it is necessary to reach at least the test load of 36 t in the standard rules of the "cast iron manhole cover" in the course of use. With the development of the city, the distance is getting wider and wider, the traffic volume is getting larger and larger, the load capacity is getting higher and higher, and the bearing capacity of the manhole covers is also getting higher and higher. Therefore, manhole covers of new materials should not only reach the existing "cast iron manhole cover" standards, but should also exceed this standard. If a new manhole cover standard is to be drafted, it is recommended that the difference and rules of carrying capacity should refer to the European standard EN124, and the carrying capacity of manhole covers used in motorway should not be less than 40 t.


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