Precast circular manholes are manufactured in 900mm to 3000mm nominal diameters. Manhole riser sections in diameters up to 2400mm are stocked in standard 0.3m, 0.6m, 0.9m, and 1.2m heights. Manhole sections can be customized to suit unique project specifications by adding flat bases, prebenching, cored holes and flexible connections.
Manholes are Manufactured to Meet the Following Standards:
ASTM C478 Standard Specification for Precast Reinforced Concrete Manhole Sections
CSA 257.4 Standards for Concrete Pipe and Maintenance Hole Sections
Flotation of concrete manholes is calculated in a similar manner to flotation in concrete pipe. In areas where flotation is a concern, Ocean Pipe can manufacture manhole sections with extended bases, helping to resist flotation by increasing the size of the failure cylinder and adding additional anchoring force by providing a cone of soil above the extended lip. For more information, click here.
Detailed dimensions are provided on drawings for all our standard Manhole products to assist with your design projects.
Please contact us if you require additional information.
Standard Manhole Buildup
|900 mm||1050 mm||1200 mm||1350 mm||1500 mm||1800 mm||2400 mm|