What are the testing standards for manhole covers

Manhole cover of national standard (GB/T23858-2019), composite manhole cover is divided into six types namely A15 / B125 / C250 / D400 / E600 / F900. The specific requirements are: in the green belt, sidewalk and other areas where motor vehicles are prohibited, A15 is selected; For sidewalks, non-motorized lanes, car parks and underground parking lots, B125 is selected; In residential areas, back streets and alleys, and areas where only light vehicles or cars are driven, C250 is selected when the edge stone on both sides of the road starts within 0.5m; In urban multi-road, highway, high-grade highway, expressway and other areas, choose D400; In the cargo station, terminal airport and other areas, choose E600; In airport runways and other areas, choose F900.

They are applied to different ranges of use, and are divided into 8 standards in total. Let's compare a few of them:

1, JC889-2001 "steel fiber concrete inspection manhole cover" standard stipulates that the corresponding test load of the manhole cover on the roadway is too low. For example, the A-class manhole cover with A crack load of 180kN is equivalent to the B125 manhole cover in the EN124 standard and the CJ/T3012 light manhole cover, which is stipulated to be used only for "sidewalks and non-motorised lanes" manhole covers, while JC889 can be "used for airports or special roads and venues such as highways for helicopter takeoff and landing". Class B manhole covers with a crack load of only 105kN can be used in "urban roads, highways and parking lots", and this manhole cover is used for urban road Louis to be crushed.

2, CJ/T3012-93 "Cast iron inspection manhole cover" although only simply divided into heavy and light two grades, but the heavy manhole cover test load of 360kN and EN124 provisions of D400 suitable for various motor vehicles close. More than ten years of practice has proved that the manhole cover with this load is basically safe to use on the road.

3, "steel fiber concrete manhole cover" A type of manhole cover "crack load" is only 18t, the index is seriously low. Although there are three domestic standards, the three standards have certain limitations, and they cannot cover the existing manhole covers of various materials. The carrying capacity of the manhole cover is a key indicator to measure whether the manhole cover can be used on the road. If the carrying 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 a manhole cover, it must at least reach the 36t test load stipulated in the Cast iron manhole cover standard.

4. EN124 "Drainage ditch cover and inspection manhole cover of driveway walking way" provides a comprehensive load grade, a clear range of use, and the gap between our standards can be clearly seen against our standards. In fact, all kinds of manhole covers produced according to Chinese standards do not meet the requirements of European standard EN124. Therefore, all enterprises exporting manhole covers in China produce according to EN124 when exporting manhole covers.

5, CJ/T121-2000 "recycled resin composite material inspection manhole cover" stipulates that the test load is only 100kN ordinary manhole cover can be suitable for "automobile 10 and below the vehicle traffic or parking site". The heavy manhole cover with a test load of 240kN is equivalent to the light manhole cover test load of EN124's C250 and CJ/T3012-93, but it can be suitable for "roads and sites where motor vehicles are driven and parked". The test load index of the manhole cover on the motor vehicle road is reduced, and the carrying capacity of the manhole cover is naturally reduced, and the safety risks exist. Different resin manhole covers, the standard is not the same, which includes the size of the bearing capacity, the respective installation position, whether the vehicle can drive and so on. I hope you found these general ideas helpful. The standard, quality and price of resin manhole cover can be viewed on the website, and we also welcome new and old customers to our factory to order manhole covers.