According to me the ATH in Bank Nifty would soon be conquered at 31070-31100 levels. Its a matter of when and not how.
Well the set up seems to be quite robust, given the uptrend in various individual Banks, I have posted the charts for each individual Bank as well.
Well HDFC Bank is also in a clear uptrend, though a clear pattern couldn't be spotted (on hourly basis), hence I did not put that chart here.
P.S. These are my views, doesn't mean anyone should take random trades basis this. Please do your own analysis or consult a reliable adviser.