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MANHOLES/CATCH BASIN/INLETS Introduction Manholes and certain appurtenances are necessary for the proper functioning of a complete sewer and culvert system. They may include manholes, inverted syphons, catch basins and inlets, flared end sections, and fittings such as bends, tees, and wyes. The concrete pipe industry has developed most of the common appurtenances and specials necessary for efficient and economical performance of the complete system. Manholes ASTM C 478 Precast Reinforced Concrete Manhole Sections C 478 manhole sections including risers, base sections, and appurtenances such as grade rings and flat slab tops are used in sizes 36 in. and larger diameters. Also available for large sewers over 3 or 4 ft. in diameter are precast base tees. The riser sections are of circular cross section and may employ an eccentric, concentric cone section or a flat slab top. Cone sections affect the transition from the inside diameter of the riser sections to the top opening. Flat slab tops are normally used for very shallow manholes. The manhole assembly may be furnished with or without steps inserted into the walls of the sections. A number of joints are used for manhole risers and cones including cement mortar, mastic compound, and rubber gaskets for sealing purposes. Steps are cast, mortared or attached by mechanical means into the wall of the section and may be made of plastic encapsulated steel, aluminum, or cast iron. ASTM C 923 Resilient Connectors between Reinforced Concrete Manhole Structures and Pipes C 923 Resilient Connectors are available for special conditions of internal or external head providing a water resistant connection between the manhole and pipe. These connections are generally used only for sanitary sewer applications. Catch Basins and Inlets Catch basins are available in 2 ft. through 5 ft. diameters in variable lengths. Inlets are available in 2 ft. diameters in various lengths. Catch basins and inlets may be manufactured with precast bottom sections. Special precast inlet boxes are also manufactured for use in highway median sloped ditch checks. |Home| |About ICPA| |Meet Our Staff| |Join ICPA|
Illinois
Concrete Pipe Association |
