Replace pipe under conservatory

[Mar]

Posted a thread before registering that's since been closed, issue is a burst pipe on a shared main where our tee off has had a conservatory built over it. Dug up the pipe on both sides and found a black 63mm pipe but since digging closer to the shared toby I've discovered that there is a blue 32mm pipe running through the 63mm like a duct.

I Intend to replace the section under the conservatory and route a new stopcock Into a different part of the house.

Any ideas how to go about replacing the section without bursting the conservatory foundation?

On the other thread someone suggested ripping it out with a lift pull but I'm not sure how to go about that to be honest.

 

[joni os]

The problem will be with tee piece, being larger than pipe, and in this case duct.
The dimensions now given would not allow chain of sufficient capacity to "bully" the fitting
through the foundations.
Probe from either end, find position of fitting. This will determine your options.

 

[Unregistered]

I think the tee will be in the middle of a 6m wide slab cos that's where the stopcock is in the kitchen. I'm about ready to face that I need to trench all the way around it lacking a better idea.

 

[Mar]

Right, an update, been busy all day digging up the pipe from the toby all the way to the conservatory n now know what I'm dealing with, its 32mm blue pipe from the toby then about half way along there's a big coupling onto the black 63mm pipe that runs all the way under the conservatory and out the other side.

Would it be feasible to tee off the 32mm and run another piece of 32 through the 63 or will the existing tee stop it?

Don't know if its worth mentioning but what comes Into the kitchen stopcock at the moment is an old lead pipe.

 

[joni os]

Provided pipe is 32mm on one side you will lose nothing by making it 32mm all through.
The new pipe can be dragged through the old 63mm and any internal formers at the tee piece. Bevel the outer edges of new pipe to help ride past obstructions. Be prepared to rotate pipe for same purpose.