Steel pipe through concrete headwall.

Detailing a 2200 mm diameter steel pipe going through a concrete headwall. Concrete headwall has top and bottom vertical face and middle tapered face. Steel pipe goes through at a 35 degree angle. Can't find the right tools to be able to cut off the pipe at the outside faces of the headwall and leave the resultant hole in the headwall. Did it quick and easy a month ago and nothing working now.