The rebar cage is the same as the cage used in regular piling. Threaded couplers are accustomed to sign up for the bars together with staggered joints. A centraliser (as per fig) is used for positioning the rebar cage inside the bore. Micro piles are often called mini piles, pin https://bodyguard27047.onzeblog.com/30167631/detailed-notes-on-micropiles-foundation