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Abstract

Method and apparatus for forming inverts in the manhole base of a manhole assembly using a single pour technique. In the single pour technique, the invert is formed simultaneously with the formation of the manhole base through the use of apparatus including a mold member having a channel-shaped projection for defining the invert. Means are provided for simply, and yet precisely, aligning the mold member having the channel-shaped projection with the members forming the openings in the base member sidewalls by forming a base member whose invert is in precise alignment with associated sidewall openings. The apparatus utilized incorporates at least one adjustably positionable channel-forming assembly for forming an invert for communicating between associated sidewall openings each having a central axis whose intersecting central axes define an angle different from 180.degree.. Alignment members on the channel-forming members employed in the two pour technique cooperate with a joining bar and clamping means to assure precise horizontal alignment between the channel-shaped projections utilized to form the invert.

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