The biggest obstacle in that would be getting some kind of sealant deep into that tunnel ( I think he said 30'?) and then getting the new pipe to stick good enough to it so there isn't even a hairline crack.
What about applying edge-beads and spots of
"GREAT STUFF" Pond & Stone to the underside of the half-pipe before inserting it into the old pipe???? Then, use several scissor-jacks positioned atop 2x4s to apply downward pressure along the half-pipe's length while the polyurethane expands and cures. This adhesive would practically "weld" the pipe-pieces together.
This solution could also be used to seal the gap between the old pipe and an inserted pipe-sleeve - if that option is preferred. Attach a 10' length of 1/4" vinyl tubing to the can's discharge nipple to allow fluid-injection well beyond the inlet-pipe's perimeter.
Definitely wear gloves and old clothes when using this messy stuff - but, as the name implies, it works "great".
