Sewer Pipe through Foundations

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Hi All,



I am hoping for some advise regarding sewer pipe and foundations.



I have a length of sewer pipe approx 3 meters and 650 mm in length, that is going through my intended foundations trench at an angle of about 45 degree, the foundations are going to be 550 mm deep. I am confused as to what to do to protect the sewer pipe from coming under too much pressure from concrete.



I have seen some suggestions on youtube etc. one is to sleeve the 110mm pipe in 160mm pipe, box around the length of pipe, I assume with engineering bricks or breeze blocks, and add pea shingle to underneath, sides and top of the pipe all 150 mm and then lintel over. But due to the angle of the pipe this will take a lot of lintels, it is then suggested to concrete over the construction to a depth of 150mm. So the total depth I would have is around 520 mm, I guess I could go an extra 30 mm in concrete depth without any worries. It is then intended to build on the foundation double skin wall 2.2 meters in height. See basic drawing attached.



What are your thoughts, is this a usual way of doing this?
 
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Is it your private sewer pipe or does it serve another property? Cover it with pea shingle and cap it with a concrete lintel.

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