UNDERGROUND PIPE JACKING 7 Underground pipe jacking can cause water ingression through the ring gap in the area of the start and end pit Targeted injections with SPESAN WS SPESAN B can seal these permanently The injection is possible either in the flooded state or against the current of flowing water If when using an open end cutting shoe unstable ground leads to a failure in the working face this can be stabilised with foaming SPESAN WN SPESAN B Leaky ring gap before injection Ring gap after injection Advance consolidation of loose gravels Water leak into the start pit

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