Inventors:
James R. Harris - Portland OR
Allen B. Kalkhoven - Beaverton OR
Assignee:
The Oregon Drop Corporation - Portland OR
International Classification:
E02D 2912
Abstract:
An integral passageway is formed in a manhole construction to establish communication between an upper inlet to the manhole and a bottom outlet. Precast sections having such a passageway formed therein may be employed to build a desired height of the manhole, an upper one of the sections having an inlet for connection to a service line and the precast sections being stacked such that the upright passageways therein are in vertical alignment.