Introduction to the specifications and standards for ductile iron manhole covers

Most manhole covers are designed to be round. The manhole cover is rounded to prevent workers who are under the manhole cover from being caught by the falling manhole cover.

The manhole cover is divided into two parts: the outer cover and the inner buckle.

The inner buckle prevents the cover from falling, and the round outer cover cannot be dropped from the inner well at any angle, which greatly ensures safety.

First, the manhole cover must have a certain load-bearing capacity and is not easily damaged. If a pressure is deformed, how many accidents will result.

Second, the manhole cover should be anti-sound, which requires the Contact occlusal Surface of the manhole cover and the well ring to directly act on the T-shaped rubber strip to soften the noise and eliminate noise. Third, of course, it must be non-slip. The Surface of the manhole cover is raised with a 3mm pattern, which is to prevent slipping and avoid accidents. Fourth, it is also necessary to prevent displacement.

The well ring is reserved with four riveted bolt holes, which are evenly distributed at 90 degrees. Each set uses 4 ground anchor bolts, which eliminates the displacement caused by mechanical rolling during the road construction. And played a certain anti-theft effect.