Strong, Reliable Manholes for Underground Infrastructure
Manholes are concrete access points that allow inspection and maintenance of underground drainage and sewer systems. They are essential for ensuring proper flow management and providing safe entry for maintenance crews.
At Majorcon Precast, our manholes are engineered for durability and long-lasting performance, making them the trusted choice for infrastructure projects. Build with confidence. Build with Majorcon Precast.
Primary Uses
- Inspection: Providing access for regular system checks.
- Maintenance: Allowing workers to enter and clear blockages or repair lines.
- Flow Management: Facilitating changes in pipe direction, gradient, or diameter.
Precast Concrete Manhole Components
Specification Sheet
Specifications
| Property | Specification |
|---|---|
| Material | Reinforced precast concrete, grade C30/37 or as specified |
| Concrete Strength | From 30 MPa upwards |
| Reinforcement | High‑tensile steel bars to BS 4449 / ASTM A615, epoxy coated optional |
| Standards | BS EN 1917:2002, SANS 1213, or equivalent local standards |
| Load Class | D400 (roads) or A15 / B125 (pedestrian) – customizable |
| Tolerances | ±5 mm on dimensions, ±10 mm on height |
Manhole Rings
| Size (Diameter × Height) | Mass (kg) |
|---|---|
| 900 mm × 600 mm | 291.3 |
| 900 mm × 300 mm | 146 |
| 1050 mm × 600 mm | — |
| 1050 mm × 300 mm | — |
| 1200 mm × 600 mm | — |
| 1200 mm × 300 mm | — |
| 1350 mm × 600 mm | — |
| 1350 mm × 300 mm | — |
Manhole Slabs (Cover Slabs)
| Internal Diameter | Height (mm) | Opening Diameter (mm) | Mass (kg) |
|---|---|---|---|
| 900 mm | 150 mm | 600 mm | 195 |
| 1050 mm | 150 mm | 600 mm | — |
| 1200 mm | 150 mm | 600 mm | — |
| 1350 mm | 150 mm | 600 mm | — |
Manhole Lid
One standard size (dimensions to be supplied). Mass: 78 kg. Available in:
- Concrete – reinforced, with lifting keyway
- Cast Iron – ductile iron, D400 load class, non‑skid pattern
Options include hinged, lockable, or rubber gasket for watertightness.
Ordering Notes
- Dimensions: All rings and slabs are standard sizes as listed; custom sizes available on request.
- Joints: Specify if O‑ring seals, mastic, or cementitious jointing is required.
- Reinforcement: Galvanised or epoxy‑coated rebar available for corrosive environments.
- Testing: Compressive strength and dimensional compliance reports available.
Why Our Manholes Stand Apart
- Manufactured with high-grade reinforced steel and dense concrete, our pipes are designed to withstand the immense pressure of heavy traffic and deep earth cover.
- Heavy-duty top slabs and access lids designed to withstand traffic loads while providing secure entry points.
- The smooth internal surface and precise dimensions ensure optimal water flow, reducing the risk of blockages and backups during heavy rains.
- Resistant to corrosion, soil chemicals, and weather exposure, ensuring decades of reliable service.
Frequently Asked Questions
Have questions about manhole specifications, installation, or load ratings? Our technical team has compiled answers to the most common inquiries below.
Our modular ring system allows for virtually any depth requirement. Standard rings are available in various heights, and we can supply additional rings or cut-down units to achieve your exact specifications.
We supply manhole slabs and lids in different load classes to suit your project requirements
Yes. We can supply manhole rings with cast-in step irons for safe descent and ascent during maintenance. These can be positioned at standard spacing intervals to comply with health and safety regulations. Please specify your step iron requirements when ordering.
We understand that every drainage system is unique. Our manhole rings can be supplied with pre-cast openings (cored holes) to accommodate various pipe diameters and positions. Alternatively, we can provide guidance on on-site cutting for connections.
Watertight integrity is critical for manhole performance. Our rings feature precision-machined joints, and we recommend using appropriate joint sealants during installation.