850x850mm EN124 D400 Ductile Iron Manhole Cover Square Frame Round Hinged Heavy Duty Lid

Product Content

Square Frame & Round Lid Hybrid Structure

As displayed in 177d56e8-5e5e-4655-84b9-1d088f13523a.jpg, this product features a highly effective combination of a square frame and a round lid. The circular cover provides optimal and uniform stress distribution across its surface when subjected to wheel loads, preventing warping. Simultaneously, the 850x850mm square outer frame allows for seamless alignment with surrounding paving, simplifying concrete or asphalt installation during road construction.

Anti-Settlement Flanged Frame Design

The outer square frame is engineered with a wide, multi-hole flanged edge and reinforced gussets at the corners. This advanced anti-settlement design drastically increases the contact and interlocking surface area between the frame and the road bedding. When heavy commercial trucks pass over, the 40-ton load capacity (D400 class) is evenly dispersed into the base road layer, effectively preventing road sinking or localized pavement cracking around the manhole.

Integrated Heavy-Duty Hinge & Anti-Slip Security

Equipped with a robust, cast-in-one piece hinge system, the cover opens smoothly for maintenance while staying securely locked against theft or unauthorized tampering. This heavy-duty locking mechanism eliminates the danger of the lid flipping, shifting, or vibrating under high-speed vehicular traffic. Furthermore, the surface features a raised texturized traction pattern to ensure reliable grip for vehicle tires and pedestrians during wet or freezing weather.

Advanced Noise Reduction & Quiet Operation

To meet modern urban noise-control standards, the contact seating surfaces between the cover and the frame are precision-machined for an airtight fit. This precise tolerance minimizes metal-on-metal friction and can accommodate high-elasticity rubber silencing gaskets. When heavy traffic passes over the assembly, vibrations are absorbed, eliminating harsh clanging or rattling noises for a quieter, more durable urban environment.