Joining PVC and plastic with instant cement?

[dubman]

I want to join a 110 mm pvc pipe to an old plastic toilet sewer pipe under the ground. The thing is the pvc pipe is 110 mm and the internal size of the plastic pipe is around 120mm, so I was thinking of just inserting the smaller pvc pipe about 4 or 5 inches inside the bigger pipe, and using normal builder's instant cement to fill in the space. First, I would pack in some tissue paper to stop the cement from going down along the pipe, leaving about 4 inches for the cement.

Would this solution be ok? Or should I use some other kind of cement? I think that silicone may not be very permanent... In any case I intend packing in normal cement all around the pipe, which I suppose would also help to seal everything? Thank you.

 

[sonray ltd]

won't be any good and don't meet building regs.

i take it this has been appoved to do what you intend doing.

use a proper sleeve or expansion/movement will break the joint.

 

[dubman]

Another idea. How about inserting the female side of a 110 mm sleeve, which would still be a bit loose, but I could put a rubber accordion type ring around it (the type used to fit a pipe to a toilet outlet) and push it into place and then cover the pipe in normal cement. Would the rubber last over time? The 40 or 50 year old elbow joint I dismantled had a rubber ring on it (round, not accordion) which was still intact.

 

[sonray ltd]

no not acceptable.

use this its 100mm - 115mm x 121mm - 136mm

 

[dubman]

That looks good. Is it some kind of hard rubber? And can it be buried under cement? Here in Spain, I don't know if I could find it though.

 

[dubman]

Here is a pic of the waste pipe. It has a pvc patch on it from a few years ago.

 

[dubman]

Please see the photo. Do you think this idea would work? My problem is that I can't seem to get the proper fittings in this part of Spain, and don't want to wait to order by mail. The idea is to wrap 2 pieces of PVC around the 110 mm pipe to make it bigger. (because 1 piece wouldnt go all the way round)....Thank you.

 

[sonray ltd]

you won't have any expansion in the joint it will break or crack.

 

[dubman]

I finally got the correct fittings / adaptors. Now my only problem is that since the old sewer seems to be plastic - it's been in the ground about 50 years, I'm not sure if PVC glue would be ok for joining the new PVC pipe with plastic? I experimented sticking two broken bits of the plastic together with pvc glue, the joint seems fairly strong, though I was able to get some glue of the plastic with a screwdriver. Is there some better way to stick pvc and plastic?