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Connection between an existing and new subways

Connection between an existing and new subways

Connection between an existing and new subways

(OP)
I have a problem about extension of an existing subway.

I did diaphragm wall before and I understand it is not difficult to make a NEW diaphragm wall watertight by placing waterstops before concreting.

However, I have no clue of how to make waterstop fitting into the slabs and walls of the existing subway.....

RE: Connection between an existing and new subways

I wouldn't be too sure about your statement that "it is not difficult to make a NEW diaphragm wall watertight".  Water resistant, yes, but almost all diaphragm walls have infiltration issues if they extend below the water table.  

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