Build over agreement (Class 1)

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I have a 100mm drain pipe which will go through my foundations at a depth of 1m.

The manhole is outside the footings of the extension so it only the protection of this clay drain I need to be concerned about.

The foundations are very deep, up to 2.4 meters.
Screen Shot 2016-01-30 at 07.55.35.png
I am thinking of something like this. Would this work?
 

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A continuous foundation with a hole in it for the pipe. Or flexible connections on a built-in pipe.
 
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A continuous foundation with a hole in it for the pipe. Or flexible connections on a built-in pipe.
Thanks woody. The pipe is existing so they can just pour the foundations around it? No lintel support required?
 
Yes the foundation can go around a pipe, but allowance for movement had to be made, so they need to devise a method of keeping the concrete off the pipe.
 
Yes the foundation can go around a pipe, but allowance for movement had to be made, so they need to devise a method of keeping the concrete off the pipe.
I've heard of people wrapping in bubble wrap. Sound acceptable or something more substantial?
 
No. You'll get uneven foundation settlement
Why do you say that. essentially that's what we always do with the only addition we line the sides and top of the granular backfill with celotex. If the crown of the pipe has less than 150mm backfill over it then we would sleeve the pipe and fill with foam using flexi joints either side.
 
No. You'll get uneven foundation settlement
Why do you say that. essentially that's what we always do with the only addition we line the sides and top of the granular backfill with celotex. If the crown of the pipe has less than 150mm backfill over it then we would sleeve the pipe and fill with foam using flexi joints either side.

Because that what will happen with two unconnected foundations.

Going by the OP drawing, 2/3 of the foundation depth are separate. One half will move and crack that 1/3 section above the pipe
 
No. You'll get uneven foundation settlement
Why do you say that. essentially that's what we always do with the only addition we line the sides and top of the granular backfill with celotex. If the crown of the pipe has less than 150mm backfill over it then we would sleeve the pipe and fill with foam using flexi joints either side.

Because that what will happen with two unconnected foundations.

Going by the OP drawing, 2/3 of the foundation depth are separate. One half will move and crack that 1/3 section above the pipe

I understand, so something more like this? And would gravel give the appropriate movement?
Screen Shot 2016-01-30 at 10.56.22.png
 

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