Civil · C-ZHCAJ

Sanitary Sewer Manhole

Materials

Concrete Reinforced Concrete Steel Stainless Steel Masonry / CMU

Elements

Stairs Reinforcing Roof / Floor Openings

About this detail

The sanitary sewer manhole assembly consists of reinforced concrete pipe riser and cones conforming to ASTM C 478, supported by either precast concrete walls five inches thick or cast-in-place concrete eight inches thick minimum. A cast-iron frame and cover sits atop a concrete collar adjusted to finished grade. Pipe openings are grouted with a two-to-one sand and cement mortar, using flexible gasket-type sealant in all joints and rubber waterstops secured with stainless steel bands on plastic pipes. Inside, flow troughs and a mortar shelf with a slope of 1.5 inches in 12 inches are constructed after removing the upper one-third of the pipe. Backfill is placed and compacted in lifts of eight inches maximum to a modified proctor density of ninety-five percent or greater.

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