rexsteel

It is manufactured in a curved dome shape to withstand external stress by cutting and bending in accordance with the specification using KS D 3503 general structural steel (SS400).

Since the cover is exposed to the ground, it uses spheroidal graphite cast iron (GCD450), which is resistant to external stress when in contact with a vehicle or the like. A sealing ring should be designed on the bottom of manhole cover to ensure it is tightly sealed when joining.

It should be designed to connect the pipe inside the box by drilling a pipe port in accordance with the branch pipe specification so that the branch pipe can pass.
A rubber ring should be inserted in the connection part so that water cannot penetrate from the outside.

Rubber packing should be evenly shaped, smooth-surfaced, and no harmful defects such as bumps and cracks, and its physical properties should be consistent with KS M 6613 (rubber goods for water works service).

By using KS D 3503 general structural steel (SS275), a ladder should be designed inside manhole to make it easy to access.

Stiffener (ribs) strengthens the force to withstand external stress applied to the body. KS D 3503 general structural steel (SS275) is used, and rib spacing can be adjusted upon request.