Abstract: A joint structure for channels used in agriculture, industry etc. which is constructed for connecting a number of concrete units to each other. The joint structure strengthens the resistance of channel both to sinking and upheaval.Neighboring concrete units are interconnected by connector plates and two fasteners passing through fastener holes formed on each end of the connector plate. An eccentric washer plate fitted on the fastener is urged against both a stop flange disposed between the fastener holes and another stop flange disposed at the lateral outside of the fastener hole of the slot type.