 A GRP Structural Manhole refers to a manhole system made from Glass Reinforced Plastic (GRP), which is a composite material consisting of plastic reinforced with fine glass fibers. These manholes are designed to provide access to underground utilities like sewer lines, stormwater drains, electrical conduits, etc.
Key Features of GRP Structural Manholes:
- Corrosion Resistance
GRP is highly resistant to corrosion from sewage, industrial waste, and harsh chemicals—ideal for wastewater and industrial applications. - Lightweight
Compared to concrete or steel manholes, GRP manholes are significantly lighter, reducing transportation and installation costs. - High Strength-to-Weight Ratio
Despite being lightweight, GRP offers excellent structural strength, making it suitable for high-load applications, including traffic areas. - Durability
They typically have a long lifespan with minimal maintenance required. - Leak-Proof Design
Manufactured as a single piece or with sealed joints to prevent groundwater infiltration or exfiltration. - Customizable
GRP manholes can be factory-customized in terms of diameter, depth, number of inlets/outlets, and flow direction.
Common Applications:
- Sewerage systems
- Stormwater drainage
- Electrical or telecom duct access
- Industrial pipelines
Typical Components:
- Shaft (cylindrical wall)
- Base with inlet/outlet pipe connections
- Ladder or step access (usually GRP or corrosion-resistant metal)
- Cover slab or top access with manhole lid
Available Sizes:
Manufacturers typically offer a range of diameters (e.g., 600mm, 1000mm, 1200mm, 1500mm, etc.) and depths based on project requirements.
download GRP manhole details in autocad format
