Automatic flip gas station manhole cover Non-bearing manhole cover square 1000x1000mm A15 manhole cover

Automatic flip gas station manhole cover Non-bearing manhole cover square 1000x1000mm A15 manhole cover

Executive standard

European standard: EN124:1994

China National Standard: GB/T 23858-2009

Test method

         Equipment: Loading system and measuring tools

         The loading system consists of loading equipment, rigid pads, rubber gaskets, etc.

The loading equipment should be able to provide a loading capacity of 1.2 times or more of the test load, and after measurement calibration, its loading accuracy shall not exceed ±3%. The loading test device is shown as below:

Detection of residual deformation

Before loading, record the initial value of the geometric center position of the manhole cover, the measurement accuracy is 0.1mm

Apply the load at a speed of 1KN/S-5KN/S until it reaches 2/3 of the detected load, then unload, and record the final value of the geometric center. Finally, the residual deformation value is calculated based on the initial value and the final value. The allowable residual deformation of the composite manhole cover shall be in accordance with the above table

Bearing capacity test

Apply the load at the rate of 1KN/S-5KN/S until the corresponding test load F value specified in this standard. The composite manhole cover is judged as qualified if there is no crack that affects the use function.