A joint for joining two wall units or panels comprising opposing male and female locking units each of which comprises C-sectioned tubular member on the connecting edges of walls or pannels, one of the tubular members being of a diameter less than that of the other to enable one to slide into the other of an adjacent wall unit for locking purposes and adapted to be rotatable therein to permit the two panels or wall units to be adjusted for connection at any desired angle to each other, the joint being completed as a monolithic joint by impervious chemicals or cement slurry/mortar/concrete, soil slurry, bentonite slurry or soil/bentonite slurry filled in the spaces between the two locking units.
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