Victorian Clay Pipe Drain Connection

[Onionpaws]

Hi, the last storm water washed away some of the clay soil under our kitchen drain which then caused the salt-glazed clay drain to drop and disconnect. As it turned out everything is still intact and just the cement seal around the two clay pipes cracked. From reading some of the other posts I think i need to add a tarred rope between the pipes.
How do I make the tarred rope or can I buy it? Does the tarred rope sit inside the back of the collar or in between the two pipe joins where it's flat?
I've read I need to pack a cement/sand mix into the collar and smooth it off so it's angled. I'm not sure of the word, possibly flaunched? What's the best mix for this? is 3:1 cement and builders sand ok?

I've got a mix of shingle and sand to lay down under and around most of the waste so the groundwater can still drain through under the house easily.

I've read I need to put a loose mix cement on the top so that it's easy to get away from the pipe if needed. Could anyone tell me what needs to go in that?

And then finally I need to lay cement on the top to seal it all off. The original looks to have been made in layers so a cement and really fine stones/grit was used and then two mm thick layers of cement skimmed on top of that. If anyone can give advice ref that I'd appreciate it.

The property is a late 1800's victorian.

 

[Onionpaws]

Okay so I found this video re the tarred gaskin

but could still use some help knowing the right cement mixes

 

[Hugh Jaleak]

The Collar on the downstream pipe has all but gone, there s nothing left to make a join into! I'd strongly suggest, getting a McAlpine DC-1, drain connector, that'll fit inside the broken end and make a decent seal, then replace the clay Gully with a plastic version, short piece of plastic pipe and or a bend to bridge the two, and make good with concrete as required.

 

[Ivor Windybottom]

I'd just rip it all out and start again, with plastic everything.

Underground pipes and/or Aco drains would be the modern equivalent.