Most manhole covers are designed to be circular. The manhole cover is circular in shape to prevent workers from being hit by falling manhole covers.

The manhole cover is divided into two parts: the outer cover and the inner buckle. The inner buckle can prevent the manhole cover from falling, and the circular outer cover cannot fall off from the inner buckle at any angle, greatly ensuring safety.

1、 The manhole cover must have a certain load-bearing capacity and be not easily damaged. How many accidents would it cause if it deforms when pressed.

2、 The manhole cover should be noise proof, which requires the contact and interlocking surface between the manhole cover and the manhole ring to directly act on the T-shaped rubber strip, using softness to overcome rigidity and eliminate noise.

3、 Of course, anti slip is also necessary. The surface of the manhole cover is designed with raised 3mm patterns to prevent slipping and avoid accidents.

4、 It is also necessary to prevent displacement. Four rivet bolt holes are reserved in the well circle, evenly distributed at a 90 degree angle. Each set uses four anchor bolts, which eliminates displacement caused by mechanical rolling during road construction and provides a certain anti-theft effect.