I
iDIY
Hi Guys,
I have used an excavator to dig my trench for the footings on my extension (1m Deep) and just in the process of tidying it up by hand before pouring the specified 225mm of concrete. I knew i have a sewer pipe crossing about 300mm below the concrete footing so this will need bridging. Its on my land and not a shared feed to the main sewer which is well off my land.
Before I get the BCO in to sign off on the trench prior to pouring, i want to make sure i have done the bridging correctly.
I am thinking of doing it as per the attached picture so the whole thing can be done in one pour. Basically i would dig 350mm either side and 150mm below the pipe, put in some shuttering either side leaving a 150mm space all around the pipe and filling it with pea gravel. I would then sit concrete lintels across the shuttering with a 200mm overlap either side then pour the concrete encasing the lot in one go.
This would provide support for the lintels (200mm either side) and leave a level continuous run or concrete throughout the trench with the lintels encased inside.
I have used an excavator to dig my trench for the footings on my extension (1m Deep) and just in the process of tidying it up by hand before pouring the specified 225mm of concrete. I knew i have a sewer pipe crossing about 300mm below the concrete footing so this will need bridging. Its on my land and not a shared feed to the main sewer which is well off my land.
Before I get the BCO in to sign off on the trench prior to pouring, i want to make sure i have done the bridging correctly.
I am thinking of doing it as per the attached picture so the whole thing can be done in one pour. Basically i would dig 350mm either side and 150mm below the pipe, put in some shuttering either side leaving a 150mm space all around the pipe and filling it with pea gravel. I would then sit concrete lintels across the shuttering with a 200mm overlap either side then pour the concrete encasing the lot in one go.
This would provide support for the lintels (200mm either side) and leave a level continuous run or concrete throughout the trench with the lintels encased inside.