In the device area, the pressure test is carried out by a pressure tester, which usually weighs 40 tons. And if it is by car, the calculation formula of 5-axle heavy truck is: 5-axle x40 tons =200 tons. Under the gross vehicle weight of 200 tons, the heavy manhole cover can be guaranteed to pass.

Where public facilities such as tap water, telecommunications, electricity, gas, heat, fire protection and sanitation are installed, manhole covers need to be installed. The test load and use position are specified as follows: EN 124, CJ/T30 12-93, CJ/T1-2000, CJ/T21-2000.

Extended data

In China, most manhole covers are not closely attached to the road surface, and tires will collide with manhole covers when vehicles run over them, so manhole covers have become one of the noise sources in cities. In the 1970s, many Japanese people suffered from the noise of manhole covers, and they asked local governments to solve the "noisy manhole covers".

The Japanese government immediately revised the standard of sewer manhole cover, changed the cylindrical manhole cover into a conical manhole cover with a large top and a small bottom, and required that the manhole cover casting must be accurate to millimeter. In this way, the manhole cover and the road surface can be seamlessly attached together, which not only eliminates the noise, but also increases the difficulty of stealing the manhole cover.

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