Why crank the bars? I agree that restraining the horizontal force at a crank of a large bar is problematic unless there is a horizontal concrete element at that point. But it you just lap the bars around the perimeter without cranking, I think the problem is much less.

Force in bar X Crank H/V = Outward Bar Force.

Add up the contribution of all the bars to hoop stress in the ties and you'll have the demand on the ties.

I think it's allowed to reinforce for crank busting forces in this way but you'll have to give some thought to how you'll integrate your concentrated local ties with the spirals above and below the cranks. Hokie's method sounds much simpler if it will work for you.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

Thank you so much for the tips.
Hokie66, the reason for cranking the bars has been requested by the contractor. The original cage had full length bars but the contractor prefers to do the cage in segments using casings a relatively smaller crane for lifting the prefabricated cage. Cranking the large diameter bars rather than simple laps side by side appears to give more spacing between bars for concrete to flow. My understanding is that for large dia bars the gap between the bars should be at least 100mm for concrete to flow?.
KootK ,I have applied the formula, does give some reasonable ammount of rebar area for ties. Should be able to continue the spiral links over if I use smaller diameters for the ties. Much appreciated.