Micropiled Raft in Cork City

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This was a contract awarded to Substruck Ltd. by Cork City Council at a property in Mahon. Substruck Ltd. were required to investigate, design, construct and certify a scope of works to address foundation movement related cracking.  

Investigation works comprised of hydrostatic drain testing, CCTV drain surveying, trial holes, dynamic probing and windowless soil sampling.  

The foundation works specification required a micropile supported 300mm thick reinforced concrete raft needled into the external walls. The piles were designed and constructed to carry a Safe Working Load of 100kN in compression. As the roof was trussed, all internal walls were removed making works much easier. Our man portable rig proved to be quite an asset once again as our standard rig could not turn inside either porch.  

A new insulated concrete screed was formed above the raft. This was constructed in 75mm concrete screed on 75mm insulation with 25mm perimeter insulation on radon barrier. A standby radon sump was also provided with capped rising pipe along the gable.

Part of the project also included drainage repairs and replacement in the vicinity of the building. All drains were tested as per the requirements of Building Regulations Technical Guidance Documents H Drainage and Wastewater Disposal 2016.