Round cover Square Frame

• Ductile iron.
• Non-slip surface.
• Black paint.
• Breaking load:40 tons.
• Exposed frame.
• Locking closure.

Class: D400

Appearance and Structural Features

• Unique Shape: The main body of the manhole cover is circular and enclosed by a square frame. This design combines the advantages of both circles and squares. It breaks the monotony of traditional manhole covers with a single shape and has high recognition. It is easy to be noticed in urban roads, residential communities and other environments.
• Surface Texture: There are complex and delicate texture patterns on the surface. These textures not only enhance the visual aesthetics but, more importantly, can increase the friction with pedestrians and vehicles, playing a good anti-slip role and reducing accidental slips or vehicle skidding caused by wet and slippery conditions or insufficient friction.

Performance Features and Functions

• High Load-bearing Capacity: Made of ductile iron, it has excellent strength and toughness. It can withstand the rolling of various vehicles, including private cars, buses, heavy-duty trucks, etc. It effectively protects various pipelines, cables and other facilities below, such as water supply and drainage pipelines, gas pipelines, power cables, communication optical cables, etc., ensuring the normal operation of urban infrastructure.
• Installation Convenience: The square frame design makes the manhole cover easier to position and calibrate during the installation process. Construction workers can place the manhole cover at the appropriate position of the manhole more accurately, reducing installation errors and improving installation efficiency. At the same time, after the manhole cover needs to be opened for maintenance in the later stage, it can also be reset more quickly and accurately.
• Strong Stability: Compared with a simple circular manhole cover, the square frame has a larger contact area with the surrounding of the manhole. And it can provide stable support in multiple directions, effectively dispersing the pressure generated by vehicle rolling, reducing the concentration of local stress, and lowering the risk of the manhole cover shifting or warping, ensuring the stability and safety of the manhole cover during long-term use.
• Anti-theft Function: The special circular cover with square frame structure makes it necessary to use specific tools and methods to open the manhole cover, increasing the difficulty for lawbreakers to steal the manhole cover. To a certain extent, it plays an anti-theft role, ensuring the safety of public facilities and avoiding safety hazards caused by stolen manhole covers, such as accidents of pedestrians falling into the manhole or vehicles getting stuck in the manhole.
• Suitable for Various Environments: Whether it is urban arterial roads, residential communities, commercial streets, or places with higher environmental requirements such as schools and hospitals, this kind of manhole cover can be well adapted. It can withstand the rolling of a large number of vehicles on urban arterial roads; ensure the safe passage of pedestrians in residential communities and commercial streets; in places such as schools and hospitals, its anti-slip, silent and other characteristics help to create a safe and quiet environment.

Summarize：

-Material properties: Ductile iron has high strength, good toughness, strong resistance to compression, bending and impact, can withstand loads such as vehicles, and is not easy to break or damage.

-Anti-theft properties: The material itself has a certain economic value, but through design (such as anti-theft locks and matching structures with the manhole seat), the anti-theft performance can be improved and the loss can be reduced.

-Good stability: The manhole cover has a high degree of fit with the manhole seat, and it is not easy to shake or shift when the vehicle is rolling over it, which can reduce noise and improve safety in use.