Square Cast-in-Place Manhole (Outdated Design)
Below are examples of Square Cast-in-Place storm drain manhole construction in various stages of completion. This multiple cold-joint construction method results in a minimum of two or more days labor time with an added day or more of waiting for backfill. Each manhole requires multiple cold-joints in the construction of the base, walls, flattop, and splash invert.
4’- 7’ Square Cast-in-Place – Various pipe sizes:
8’ Square Cast-in-Place – 5′ x 4′ RCB: