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Precast Concrete Manholes 

manholePrecast concrete manholes are an integral component of any modern sewer system. A properly designed and installed precast concrete manhole system provides superior watertight performance compared with competing methods and materials. A typical precast concrete manhole can be installed to any depth, because lateral forces act equally around the periphery, which places the section in pure compression – the ideal state for concrete. Precast concrete manhole sections are produced in a controlled environment, thus exhibiting high quality and uniformity.

Why Precast?

Durability

Studies have shown that precast concrete products can provide a service life in excess of 100 years.  For severe conditions, additional design options are available that extend the life of the precast concrete product.   

Reduced Weather Dependency

Precast concrete increases efficiency because weather will not delay production of the manholes.  In addition, weather conditions at the job site do not significantly affect the schedule because less time is required to install precast compared with other construction materials, such as cast-in-place concrete or brick.

Quality

Because precast concrete products typically are produced in a controlled environment, they exhibit high quality and uniformity.

Fire Resistance

Precast concrete manholes are noncombustible. 

Strength

The strength of concrete gradually increases with time.  Other materials can deteriorate, experience creep and stress relaxation, lose strength and/or deflect over time.  

Buoyancy

With a specific gravity of 2.40 and superior frictional resistance, precast concrete manholes resist buoyant forces better than all other manhole materials.

Watertightness

Precast concrete manholes are produced to be watertight.  Standard watertight sealants and gaskets are available that are specifically designed for use with precast concerete, making multiple-seam precast concrete manholes very easy to construct.  

 

 

 

 

 

 
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