Precast Concrete Sewage Manhole

Precast concrete manholes have become the construction industry’s product of choice over cast-in-place concrete, brick and other non-concrete products for many reasons, not the least of which is ease of installation. Precast concrete manholes can be easily installed on demand and immediately backfilled. There is no need to wait for concrete or mortar to cure at the job site.

Certification:
To become an NPCA certified plant, a precast concrete production facility must exceed a level of excellence defined by NPCA in accordance with relevant industry standards. Plant inspections are performed by an engineer from an independent, nationally accredited firm, and all certification applicants are graded on all critical aspects of plant operation. A standard grading schedule is used for all inspections to ensure uniformity. Inspections are performed during actual plant operation.

Usage Instructions:
Set the manhole base on graded bedding according to job specifications, making sure boots or pipe openings match design elevations. Level the top of the manhole base in both directions.

Benefits:
ASTM A48/A48M, “Standard Specification for Gray Iron Castings”
ASTM A185 / A185M, “Standard Specification for Steel Welded Wire Reinforcement, Plain, for Concrete”
ASTM A496, “Specification for Steel Wire, Deformed, for Concrete Reinforcement” ASTM A497/A497M, “Standard Specification for Steel Welded Wire Reinforcement,