We have been required to do some rectification works on a recently constructed reinforced concrete headstock. This rectification works involves the drilling of 1200mm deep, 45mm diameter cores into the concrete. We have been diamond core drilling and all has gone well except for the last core where we have struck a lot of reinforcing steel which has just been destroying the core barrels and subsequently have not been able to get through. Is there any other process that can easily drill through steel and concrete at the same time? We are hitting the steel at approximately 300mm down. We have to get this core down to 1200mm deep and the maximum width that the core can be is 50mm. Any suggestions?
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