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An RCC (Reinforced Cement Concrete) manhole cover with frame is a vital part of urban infrastructure, typically used to cover and protect manholes in roadways, pavements, and other public areas. Here's a detailed description:

1. Manhole Cover:

Material: Made from reinforced cement concrete (RCC), which is a mixture of cement, water, aggregates, and steel reinforcement bars (rebar). This combination gives it strength, durability, and resistance to heavy loads.

Design: The cover is usually circular, but can sometimes be square or rectangular. The circular design minimizes the risk of the cover falling into the manhole since it can't rotate out of place.

Weight: The cover is heavy enough to prevent unauthorized access, but its weight also ensures that it remains stable under traffic and weather conditions. Standard weight can vary depending on the diameter and design, typically ranging from 50 to 150 kg (110 to 330 lbs).

Load Bearing Capacity: These covers are designed to withstand heavy loads from vehicles, including trucks and buses, and must meet the required strength standards.

Surface Texture: The surface may be textured or patterned to provide better grip and prevent slipping, especially in wet conditions.

2. Frame:

Material: Like the cover, the frame is also made from reinforced cement concrete or sometimes cast iron. It is designed to securely hold the manhole cover in place.

Shape: The frame typically has a circular or square structure, with a groove or lip to support the cover securely. This ensures that the cover fits tightly into the frame and does not shift out of place.

Functionality: The frame is embedded into the surrounding surface (such as the road or pavement) and ensures that the manhole cover remains in place even during heavy traffic. It also helps prevent dirt, debris, and water from entering the manhole.

3. Installation:

The frame is usually set flush with the ground, with the manhole cover resting on top of it. The cover can be lifted using specialized tools when maintenance or access to the underground utilities is required.

4. Applications:

Urban Infrastructure: Commonly used in roads, highways, and sidewalks to provide access to underground utility systems, like sewer lines, electrical cables, and water pipes.

Public Safety: Ensures the safety of pedestrians and vehicles by preventing accidents related to exposed or unstable manholes.

5. Standards:

RCC manhole covers and frames are often manufactured to conform to specific international or local standards, such as IS 12592 or similar standards in various countries, which regulate load-bearing capacity, material quality, and other aspects.

These covers and frames are essential for ensuring the functionality and safety of urban utilities while blending seamlessly into the infrastructure.