Round Cast-In-Place Manhole (Best Design)
Below are examples of Round-Cast-in-Place storm drain manhole construction in various stages of completion. Each manhole was poured as a one-piece-joint-free unit with pipe connections fully encased within the structural wall. The flattop, or cone, and invert were also formed from same pour.
4’ Diameter Manhole over 24″ RCP:
6′ Diameter Manhole over 4′ x 2′ RCB:
8’ Diameter Manhole over 54″ RCP: