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
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.
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.
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.
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 | 5 T | 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 |
Dimensions Of Frame
IS 12592 : 2002 With BIS Marking
| Grade | Description | Clear Opening In Frame A | B | C | D | E Min | F Nominal |
|---|---|---|---|---|---|---|---|
| LD-2.5 | Light Duty Rectangular | 450 × 600 | 50 | 50 | 50 | 50 | 559 × 709 |
| Light Duty Square | 400 × 400 450 × 450 |
50 | 50 | 50 | 50 | 509 × 509 559 × 559 |
|
| Light Duty Circular | 370, 450, 500, 560 | 50 | 50 | 50 | 50 | 479, 559, 609, 669 | |
| MD-10 | Medium Duty Rectangular | 450 × 600 | 70 | 50 | 50 | 50 | 560 × 710 |
| Medium Duty Square | 450 × 450 600 × 600 |
70 | 50 | 50 | 50 | 560 × 560 710 × 710 |
|
| Medium Duty Circular | 450, 500, 560, 600 | 70 | 50 | 50 | 50 | 560, 610, 670, 710 | |
| HD-20 | Heavy Duty Rectangular (Scrapper) | 900 × 450 | 90 | 75 | 75 | 75 | 1060 × 610 |
| Heavy Duty Square | 560 × 560 | 90 | 75 | 75 | 75 | 720 × 720 | |
| Heavy Duty Circular | 450, 500, 560, 600 | 90 | 75 | 75 | 75 | 610, 660, 720, 760 | |
| Heavy Duty Lamphole | 350 | 90 | 75 | 75 | 75 | 510 | |
| EHD-35 | Extra Heavy Duty Rectangular | 900 × 560 | 100 | 75 | 75 | 75 | 1060 × 720 |
| Extra Heavy Duty Square | 560 × 560 | 100 | 75 | 75 | 75 | 720 × 720 | |
| Extra Heavy Duty Circular | 450, 500, 560, 600 | 100 | 75 | 75 | 75 | 610, 660, 720, 760 |
Notes:
*Tolerance on C shall be ±5 mm, tolerance on A, B, D and E shall be +5/-0 mm.* For facility of removing the manhole cover suitable upward taper not more than may be provided to the inner periphery of the frame
* If required for the removal of the moulds suitable taper not more than can be given at the lower inner periphery of the frame (see figure).
* Dimension of cover is covered in 5.2. The dimension for frames is indicative only and has been arrived at based on the nominal values of dimensions and and a maximum taper of on the inner periphery of the frame, wherever provided (see Note 2), subject to the provisions in 5.2.
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. |
