The main method is:

Convert high-grade concrete piles into something similar to low-grade (or soft) concrete piles!

How to convert?  By creating small cracks all over the high-grade concrete pile!

When the pile breaker is cutting from top to bottom, carefully observe. As soon as one of the drill rods creates a crack in the concrete, stop immediately! Retract all the drill rods and then move the pile breaker to the next section. Rotate the pile breaker at an angle and continue cutting down as before!

Remember, do not cut through the entire section. Only when the whole pile is filled with small cracks can you cut from top to bottom again. This method will prevent the reinforcement steel from breaking!