Precast Concrete Manholes

Precast Manholes are used in sanitary sewer and storm drain systems for access, observation and junctions.

They are a good choice for:

Pump stations
Wet Wells
Stormwater Management Structures

All manholes and vertical structures can be provided for highway, railroad or aviation loading.

Precast Manholes Applications

Precast Manholes can be used for the following:

Access to the system for maintenance
Observation points
Changes in pipe size
Changes in pipe shape
Changes in direction of pipe
Junctions for multiple pipes

Precast circular vertical structures can be used for the following:

Stormwater management or best-management-practice structures
Overflow structures for ponds

Precast circular manholes and vertical structures can be provided with the following features:

Precast invert channels
Protective linings
Custom openings
Flexible watertight pipe-to-manhole connections
Custom tops

Concrete Manholes Sizes

Precast Circular Manholes and vertical structures are normally available in diameters of 48 inches through 144 inches.

Precast Manholes Joints

The following joints are normally available for precast circular manholes and vertical structures:

Single offset with profile rubber gasket
Confined o-ring rubber gasket
Preformed mastic or butyl gasket

Concrete Manholes Specifications

The following specifications apply to precast circular manholes:

ASTM C478 / AASHTO M199 — Precast Reinforced Concrete Manhole Sections
ASTM C443 — Joints for Circular Concrete Sewer and Culvert Pipe Using Rubber Gaskets
AASHTO M198 — Joints for Circular Concrete Sewer and Culvert Pipe Using Flexible Watertight Gaskets
ASTM C923 — Resilient Connectors Between Reinforced Concrete Manhole Structures and Pipes
ASTM C1244 — Standard Test Method for Concrete Sewer Manholes by the Negative Air Pressure (Vacuum) Test

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