While casting, polystyrene will be placed at the pockets which can be removed later to form the shear pockets. There will be a concrete plug to stop the water. People can go down and weld the dowels to the caisson reinforcement.
To resist the hydraulic uplift for a caisson, I thought of providing shear pockets (say 400x400x75mm) on the caisson walls at 1m centres horizontally so that the base wall can be cast into the shear pockets which would give good shear capacity against the uplift. Also, I was thinking to provide...