This device measures the impact performance of manhole base and manhole walls. The impact is caused by free falling weight to the center of slow channel in the manhole base. JJICI manhole impact tester is used to test the impact performance of manhole base and manhole wall. Test procedure: release the weight at a height of 2.5m, make it fall free to impact the center of the slow channel in the manhole base. The radius of curvature of impact weight is 50mm and mass is 1kg. After impact, check whether manhole base is damaged.
