You could hire someone to bore the line for you which wouldn't require any backfilling but if you don't want to spend the money keep the trench as narrow as feasible and mix up a sand bedding mix real wet so it flow fills the gap around the pipe and supports your walkway
sjg97 t1_jebgbfs wrote
Reply to How do I backfill a trench beneath a sidewalk? by Kalarix
You could hire someone to bore the line for you which wouldn't require any backfilling but if you don't want to spend the money keep the trench as narrow as feasible and mix up a sand bedding mix real wet so it flow fills the gap around the pipe and supports your walkway