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Foundations-build over pipe (trench vs piles-minimum clearance)

Anonymous user 28/02/2024 - 3.26 PM

I'm trying to build over a 900m diameter sewer with invert level 2.7m below ground level. The max distance that I have from edge of the sewer to the site boundary is 1.3m. This does not fall under the utility company's responsibility but rather the local council's Drainage department i.e. drainage consent (this was the old Environment Agency's job). -Does anyone know if the council (Harrow) drainage department follow Thames Water rules in terms of build over agreement or do they have their own rules? -Structural Engineers that I've spoken to have mentioned that I'd need to use augered pile foundations for this- would augered piles affect the structure of the pipe if built within 1m? i.e. is this enough clearance? -If I were to use trench/strip footing- is it feasible to go down to 2.7-3m without affecting the pipe? The max width I have is 400mm. Thanks