How to connect abs to concrete pipe

Hello , I'm going to back fill a trench in slab . Should I pour in some concrete in the bottom of the trench here and there to hold up the pipe before backfilling trench with dirt ? Also can I encase part of the abs in concrete if I wrap the pipe first ? Thanks Spanky

I'm adding a shower to a basement 2 piece bathroom. Under the concrete is cast iron drain pipe. Above is ABS vent pipe which I'd like to tie into. Should I use 4" PVC or ABS drain pipe? This house is in Alberta Canada.

I have a 1-1/2" cast iron show drain. Will attach to 1-1/2" abs male threaded coupling. Do I need to put pipe thread or plummers puty on the threads?

I need to connect drainage from kitchen sink in an older home which is now copper pipe (1 9/16" outside diameter) to 1" ABS. Connections under sink and vent pipe are all this copper pipe but where it goes through the floor into the basement it goes into an iron connection on the basement floor...

I have to move my toilet over an inch from the wall per inspector's request. I have searched the internet and have not found an ABS offset closet flange that would work for me. I did however find a cast iron flange that measures 4" x 2" (Jones Stephens Corp., Model # C44-420). Is it at all...