Warped underground pipe coupling

rjm2k · 23 Nov 2020

Any suggestions on how to return this underground pipe to its correct shape so I can replace this split coupling that has been leaking? Hot water? Just leave it and use plumbers putty? Some kind of insert? 110mm soil pipe

Thanks

Hugh Jaleak · 23 Nov 2020

Drain Techs have 'Rerounding gear', to deal with misshapen pipework before lining it, not sure if you'll be able to do much otherwise. Only suggestion I can offer if to try and gently warm it up, and pack it out to accept a new coupler, or alternatively, see if you can get a McAlpine DC-1 or similar inside it to make a new joint and re shape the pipe. Need to investigate whats crushed it in the first place.

Ian H · 23 Nov 2020

I bet there’s a big stone between the pipe and wall.

footprints · 23 Nov 2020

Looks like one of these to me https://www.toolstation.com/flexibl...jGx8N7qN1K97jq3UYejX6V3Lhaex90RBoCblAQAvD_BwE

The pipe has been cut on a bend that is why it is not perfectly round, result of a previous bodge, try bodging it again or dig out the bend and cross your fingers you can get a new one on.

Or might be.
https://www.toolstation.com/flexible-adaptor-clay-to-pvc/p54240

rjm2k · 23 Nov 2020

Thanks for the suggestions, not sure what caused it but the stack has been poorly supported and has dropped by at least an inch judging by the movement of the clips revealing unpainted sections. I discovered the issue after noticing material had washed away around the base which had been hidden behind a piece of garden furniture. I had assumed it was surface water and intended to add a gully, however I then noticed the coupler was split. There is a power cable that has been run behind the pipe but nothing obvious that would have caused that level of distortion which is focused around the split . This is at the bottom of a slope so the concrete to the right could have moved downhill and caused it, or pressure from the soil pipe?

Hugh Jaleak · 23 Nov 2020

If its external, I'd seriously look at digging the whole section out and redoing it, support it with some dry concrete whilst you're at it, otherwise I worry you may be back here again before too long. Drains dont just 'drop' unless there some ground movement.

rjm2k · 23 Nov 2020

If by whole section you mean back to the manhole that's not really feasible given its around 4m away, over 6ft deep.....

and in the conservatory.

JimCrow · 23 Nov 2020

Dig down and cut the pipe below the distorted pipe and renew it from there, get yourself 2 new 110mm collars and a cutting of 110mm pipe.

tel765 · 23 Nov 2020

OP,
The water from the split fitting could have caused wobbly movement around the split fitting & pipe - and caused the drop. Poorly fixed pipe clips can also be a cause of pipes slipping and dropping.
As you've already done you might nibble more concrete away from around the pipe to give yourself working space.
Then you can cut the pipe, probably just below the fitting, and make your new connection from there.

tel765 · 23 Nov 2020

JimCrow, sorry i overlapped your good suggestions.

Hugh Jaleak · 24 Nov 2020

rjm2k said:
If by whole section you mean back to the manhole that's not really feasible given its around 4m away, over 6ft deep.....

and in the conservatory.

No, I was referring to the damaged section. As with Jim's advice, cut back to a decent section of pipe, rejoin and come back from there, I think you'll struggle to do anything with the damaged section, it's too far gone now to pull back. Then pack it in some concrete if need be to prevent a recurrence.

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Warped underground pipe coupling

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