Need advice on covering shower drain pipe in floor

I am in the process of reclaiming some space in our utility room which has meant removal of an old shower cubicle which we never use (previous owners used it for their dogs!)
This means that I need to cover over the old drain pipe which is a vertical plastic waste pipe in the concrete floor, which goes to a gulley somewhere under the rest of the concrete floor in this utility room. At the moment in extends about 4 inches into the air, but obviously I can cut this down to floor level.
Qustions are Would it be safe just putting some concrete down this pipe, as there must be a bend somewhere just below the surface? Should I cap it off with something and then concrete over that? I need to cover it as the shower cubicle area is about half an inch lower than the rest of the room.
The main points are that the whole of the room is a concrete floor with quarry tiles over most of it. I was planning to level everywhere to the same height as the quarry tiles and then lino the whole room.
Any suggestions from the most useful group on Usenet most welcome.
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Mike Norris wrote:

I'd plug it with a plug of polystyrene/cloth/whatever, then fill with a small amount of sand/cement.
--
Grunff

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Hello Mike

Don't pour concrete down without first wedging something a few inches down to block it. A bundle of rags rammed into place is ok - but DO check it's not a straight drop into your 4" sewer outlet, and if it takes more cement that you thought, don't keep piling it in.

Why not just cover the hole with a thin piece of board then fill the whole depression?

Lino over quarry tiles? Not my choice...
--
Simon Avery, Dartmoor, UK
uk.d-i-y FAQ: http://www.diyfaq.org.uk /
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Not really mine either, but I can't think of anything else that is relatively easy or relatively cheap.
Floor area isn't flat enough for laminate, nor really suitable (washing machines, doors either end to gardens etc)
I could tile over the whole lot again, but to be honest the tiles make the room very cold in winter, so I thought lino would give a bit of warmth and soften it all slightly, while at the same time be practical.
I'd welcome any other suggestions, though, and thanks for the advice so far.
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