Precast Cement Manhole Covers and Frames

Precast Cement Manhole Covers & Frames

Overview

Material Combinations/ Technical Details

Precast Cement Manhole Covers and Frames are designed for heavy-duty and high-load applications. Manufactured using high-grade concrete and precision moulds, these products ensure consistent strength, dimensional accuracy and long-term durability. They are suitable for areas where vehicular and public traffic is high, providing safe access to underground drainage, sewer and utility networks.

Used in Projects

Smart cities.
IT parks.
Highways.
Residential Colonies.
Hospitals.
Commercial Complexes

Applications

Municipal roads
Highways
Industrial zones
Government infrastructure
Urban Development Projects

Product Catalog

SFRC / RCC Round Manhole Cover & Frame (EHD - 35)

The EHD-35 (Extra Heavy Duty) model is a high-performance 560 mm diameter manhole cover rated for 35-ton loads, making it ideal for industrial zones and heavy vehicular traffic. Manufactured from Steel Fiber Reinforced Concrete (SFRC), it offers superior crack resistance and a long, corrosion-proof service life compared to traditional materials. Its concrete composition provides a significant anti-theft advantage as it has no scrap value, while integrated lifting points ensure safe and easy maintenance access.

SFRC Square Perforated Gully Grating Cover & Frame (EHD-35)

This EHD-35 Square Perforated Gully Grating is a heavy-duty drainage solution engineered to withstand a massive 35-ton load capacity in high-traffic industrial zones. Its high-flow slotted design allows for rapid surface water intake while effectively filtering out large debris to prevent system clogs. Built from Steel Fiber Reinforced Concrete (SFRC), the unit is completely corrosion-proof and offers a significant anti-theft advantage since it holds no scrap metal value. The robust frame ensures a stable, non-slip fit, while integrated lifting hooks facilitate safe and efficient maintenance access.

SFRC Round Manhole Cover with a Square Frame

This Extra Heavy Duty (EHD-35) manhole set features a 560mm round cover seated in a robust square frame, engineered to withstand massive 35-ton loads. Made from high-grade Steel Fiber Reinforced Concrete (SFRC), it is completely corrosion-proof and offers superior crack resistance for high-traffic industrial zones. The concrete composition provides a major anti-theft advantage due to its zero scrap value, while integrated lifting holes ensure safe and easy maintenance access.

RCC New Jersey Road Barrier

These high-strength M30/M40 grade RCC barriers are engineered for superior traffic management and impact safety. Featuring a standard New Jersey profile and high-visibility yellow-and-black finish, each 1-meter unit weighs approximately 450–550 kg to ensure maximum stability without bolting. Their reinforced concrete construction is completely weather-proof and includes integrated heavy-duty lifting hooks for rapid mechanical installation.

Technical Specifications

1. General Technical Specifications

Material Composition

Feature	Standard / Description
Concrete Grade	Minimum M30 for standard use; M40+ for heavy duty.
Reinforcement	High-strength deformed steel bars (TMT) or Steel Fiber Reinforced Concrete (SFRC) for enhanced crack resistance.
Cement	53-Grade OPC or PPC conforming to standard codes.
Aggregates	Well-graded coarse and fine aggregates (max size 20mm).

Manufacturing Process

Feature	Standard / Description
Compaction	High-frequency vibro-compaction for high density and zero voids.
Curing	Minimum 14-28 days water curing or steam curing for rapid strength.
Edge Protection	Mild steel (MS) flat edging (25x3mm or 2mm sheet) to prevent chipping.
Finish	Chequered or anti-skid top surface with protective anti-corrosive paint on the underside.

2. Dimensional Specifications

Grade	Category	Load Capacity	Typical Clear Opening (mm)	Recommended Location
LD 2.5	Light Duty	2.5 MT (25 kN)	450 x 450 / 600 Dia	Residential complexes, footpaths
MD 10	Medium Duty	10 MT (100 kN)	560 Dia / 600 x 450	Service lanes, car parking areas
HD 20	Heavy Duty	20 MT (200 kN)	560 Dia / 600 x 600	Commercial areas, city trunk roads
EHD 35	Extra Heavy	35 MT (350 kN)	600 Dia / 900 x 600	Industrial zones, ports, warehouses

3. Installation & Jointing

Step 01

Base Preparation

Prepare a level bed using 1:3 cement mortar or a lean concrete base. Ensure the opening matches the frame's clear opening.

Step 02

Frame Placement

Set the frame on the mortar bed, ensuring it is perfectly flush with the road/floor level using a spirit level. Secure with additional concrete haunching.

Step 03

Joint Sealing

Use bituminous sealants or rubber gaskets for watertight joints in sewerage applications. Fill gaps with non-shrink grout.

Pro Tip:

Wait at least 72 hours for the bedding mortar to cure before allowing vehicular traffic over the new installation.

4. Chemical & Environmental Resistance

Chemical / Environment	Description
Chemical Resistance	Naturally resistant to sulfates and moderate acids (pH 3+). Can be enhanced with crystalline admixtures or epoxy coatings for aggressive sewer gases (H2S).
UV & Thermal Stability	Unlike plastic/FRP, concrete does not degrade under UV exposure and maintains structural integrity in extreme temperatures (fire-resistant).
Water Impermeability	High-density vibro-pressed concrete ensures low porosity, preventing water ingress and protecting internal reinforcement from rust.