Use
Precast circular concrete manholes are used in sanitary sewer and storm drain systems for access, observation and junctions. They are a good choice for:
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pump stations |
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wet wells |
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stormwater management structures |
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impoundment overflow structures |
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| All manholes and vertical structures can be provided for highway, railroad or aviation loading. |
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Applications
Precast circular manholes can be used for the following:
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access to the system for maintenance |
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observation points |
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changes in pipe size |
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changes in pipe shape |
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changes in direction of pipe |
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junctions for multiple pipes |
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Precast circular vertical structures can be used for the following:
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wet wells |
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stormwater management or best-management-practice structures |
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overflow structures for ponds |
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Precast circular manholes and vertical structures can be provided with the following features:
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precast invert channels |
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protective linings |
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flexible watertight pipe-to-manhole connections |
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custom openings |
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custom tops. |
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Sizes
Precast circular manholes and vertical structures are normally available in diameters of 48 inches (1200mm) through 126 inches (3600mm). |
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Joint
The following joints are normally available for precast circular manholes and vertical structures:
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single offset with profile rubber gasket |
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confined o-ring rubber gasket |
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preformed mastic or butyl gasket |
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Applicable Specifications
The following specifications apply to precast circular manholes:
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