1. Determine the height of the well masonry according to the design requirements of the reinforcement ring. Before installing the steel skeleton, clean the foundation pit thoroughly, and the concrete pouring in low grade strength around the wall of the ductile iron manhole cover will be made flat. The steel skeleton needs to be machined into a square, and the installation is in accordance with the wellhead position, and ensure that the protection of the reinforcement is in good condition.

2. The installation of the well ring and the ductile iron manhole cover shall be carried out before the construction of the asphalt surface, and the shape and size of the shaft reinforcement shall be determined according to the design requirements of the well cover size and the reinforced well circle. It is usually the square of the center of the wellhead, and the cutting machine is used to cut the pavement structure inside the well circle.

3. The embedded bolts can be installed simultaneously with the well frame, and the die positioning can be adopted. The bolt should be placed vertically, and the nut should be tightened before pouring concrete, so that it can be effectively connected with the concrete and well frame.

In the design of ductile iron manhole cover, anti-theft device, anti-theft bolt, anti-theft bolt and shaft seat cover are added, and the well cover can be opened and not removed from the shaft, greatly reducing the loss. Ductile iron manhole covers are separated and easy to leave. So the nodular cast iron manhole cover is often lost.