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4'-0" Dia. or <br />5'-0" Dia. <br />(See Note 4)Varies3'-0"GradeHeavy Duty Casting <br />(Refer to Standard 4-6) <br />Adjusting Rings to Bring Frame to Grade. <br />(Refer to Standard 4-6) <br />Reinforced Conc. Pre-Cast Manhole <br />Pipe Sizes <br />8" to 24" <br />Conc. Bench <br />(Class A) <br />Pre-Cast Base <br />Eccentric Cone <br />6" Min. <br />(Typ.)6"Min.B-Borrow (Compacted) <br />SECTION VIEW <br />PLAN VIEW <br />Precast Manhole Section <br />B-Borrow Backfill Unless <br />Otherwise Approved by City Engineer <br />Conc. Bench (Class A)(Typ.) <br />4% Slope (Typ.) <br />Flow Channel <br />(See Note 3) <br />Min. Distance Between Openings shall be 6" <br />for pipe up to 10" Nominal Diam. For Larger <br />Pipes the Min. Distance Between Openings <br />shall be 1/2 O.D. of Smallest Pipe <br />Flow Channel <br />Seal all Joints w/ Conseal CS-102, <br />Bidco C-56 or Approved Equal. <br />Wrap all Joints with Conseal CS-212 <br />Exterior Joint Wrap or Approved <br />Equal. Apply Joint Wrap Primer per <br />Manufacturers Requirements. <br />4" Min. Clearance Between Lowest <br />Pipe Invert and Manhole Bottom <br />Inlet Pipe <br />FlowOutlet Pipe <br />Flow <br />80% of PipeDiameter80% of PipeDiameterSanitary Manhole <br />DETAIL A16" O.C.Copolymer polypropylene plastic manhole <br />steps with 1 2" grade 60 reinforcing steel <br />6/26/18 <br />CITY OF SOUTH BENDItemRevision <br />STANDARD <br />EFFECTIVE DATE: <br />REF STD SPEC SEC <br />APPROVED/REVISED BY THE BOARD OF PUBLIC WORKS <br />STANDARDS FOR DESIGN <br />AND CONSTRUCTION <br />Kara M. Boyles, Ph.D., P.E. Date <br />TYPE A MANHOLE - STANDARD PRE-CAST 4-1 <br />4-2, 4-3 and 4-4 <br />June 26, 2018 <br />SECTION 4 - SANITARY <br />NOTES: <br />1.All manholes shall be manufactured and installed in compliance with ASTM C-478. <br />2.All pipe connections shall be made with integral resilient fittings complying with ASTM <br />C-923. <br />3.Flow channel shall conform to the shape of the connecting sanitary sewer and be <br />made through the bottom surface of the manhole. The channel walls shall be formed <br />or shaped to the full height of the crown of the outlet sewer. <br />4.Refer to manhole size vs. pipe size chart on Standard 4-2. <br />5.Completed manholes shall be tested with negative air pressure (vacuum) in <br />accordance with ASTM C-1244-93. <br />6.At manholes where a smaller diameter sewer joins a larger diameter sewer, the invert <br />of the larger sewer shall be lowered such that the elevation at 80% of the pipe <br />diameter of both sewers is matched (Refer to Detail A above). <br />7.The Design Engineer to be responsible for setting pipe invert elevations to account for <br />minor losses through the manhole.