Yes, it can come in contact with concrete.
It can't be done without cutting the pipe
You will have to remove the concrete above and around the leaking pipe. All or some of the pipe may need to be replaced. If your house was new in the early 1980s, the PVC pipe that was used has been found to be generally faulty.ANS 2 - FIRST - make sure it IS under the concrete. In my experience this hardly ever happens unless the foundation has cracked, or building settled considerably.
There is a tool called easy out.
Not knowing your situation it's hard to answer. What type, cast iron, PVC, brass? Is it on wood over a basement or crawlspace or in concrete? Cast iron on wood over a basement or where you can get to it underneath. You can be gentle, peel out the lead and packing that is holding it in and remove it. You can break the collar and take it out in pieces. Might break the pipe under it if not careful. You can cut the pipe farther down the line and replace it with PVC with a rubber coupler between the PVC and the cast iron. If you just remove the collar, when you replace it, you can just use a repair ring that screwes to the floor. As long as the pipe is supported underneath the floor, the collar does not need to be attached to the pipe.
I was in the PVC pipe manufacturing business for over 30 years and have never heard of a "1K PVC" pipe. If "1K" means a 1,000 psi pipe, this does not exist as a commercial product. Sorry.
An instrument made of PVC pipe.
A pipe cutter is the best tool to cut PVC pipe.
Yes
pvc flange if glued properly can not be detached you just need to cut it and fix up a new one if the old flange is useless. www.pvcpipe.in
An instrument made of PVC pipe.
With a PVC locator