Hi
I'm in the middle of a discussion with the BCO regarding the proposal to cross the corner of an extension where an existing 4" drain sits.
The drain sits at a centreline of 530mm below ground level, so around 470mm above the bottom of any trench.
I proposed a full fill foundation with 50mm compressible material around the drain:
This was rejected by the BCO, who requested a 1m^2 pad foundation with lintels in a T-shape, which I felt would be too busy and confuse the build process. I therefore proposed the design below, i.e. increasing the ground bearing area in the corner, so the load would be spread equivalent to having a strip foundation built. Loads would be nicely spread around the drain using standard C20/GEN3 concrete:
BCO has stated they believe this is fundamentally wrong, and has asked for the design as below:
Personally, I don't see the point of an eccentric lump of concrete outboard of the corner, but I would value your opinion.
Thanks
Mike
I'm in the middle of a discussion with the BCO regarding the proposal to cross the corner of an extension where an existing 4" drain sits.
The drain sits at a centreline of 530mm below ground level, so around 470mm above the bottom of any trench.
I proposed a full fill foundation with 50mm compressible material around the drain:
This was rejected by the BCO, who requested a 1m^2 pad foundation with lintels in a T-shape, which I felt would be too busy and confuse the build process. I therefore proposed the design below, i.e. increasing the ground bearing area in the corner, so the load would be spread equivalent to having a strip foundation built. Loads would be nicely spread around the drain using standard C20/GEN3 concrete:
BCO has stated they believe this is fundamentally wrong, and has asked for the design as below:
Personally, I don't see the point of an eccentric lump of concrete outboard of the corner, but I would value your opinion.
Thanks
Mike