lintel in foundations over drainage

Sewer pipes to go though foundations, protected by concrete lintel. What depth in the foundations does the lintel go - replacing first row of bricks / embedded in trench, or what ? Also, how is the size of the lintel calculated. Thanks, Simon.

Reply to
sm_jamieson
Loading thread data ...

On 23 Nov 2005 02:29:08 -0800, a particular chimpanzee named sm snipped-for-privacy@hotmail.com randomly hit the keyboard and produced:

The drains shouldn't go through the concrete foundations (actually, they can, but you'd need rocker sections either side). They should go through the wall. If the drain is low relative to the foundation then you should step the foundation below the drain. The steps should be at least twice as long as the thickness of the concrete. The lintels are bog-standard 150x100mm precast concrete lintels - no calcs needed.

_________________________________________ _________________________________________ Wall ___________| Lintel |_____________ ___________|_______________|_____________ ______________| |________________ ______________| O |________________ _ |___|_________|____| /\ T Concrete ____ _____ \/ |_____________________________| | 2xT |

Reply to
Hugo Nebula

Thanks for that. This is in an area where the foundations must be 2 metres due to near public sewer that has 2m invert. I think the pipe will be over 1 metre down. That would be a lot of brickwork over the top. Wouldn't you have the foundations up either side of the pipe and a lintel across concrete the concrete "walls" either side ? Otherwise, the lintel would be supported on the underground blockwork, which would be hard to construct one metre down. Also, what is a "rocker section" ? Lots of questions I know. Thanks, Simon.

Reply to
sm_jamieson

On 25 Nov 2005 02:29:04 -0800, a particular chimpanzee named sm snipped-for-privacy@hotmail.com randomly hit the keyboard and produced:

Right. If you're trench filling your foundations, the drain is a

100mm diameter one passing at right angles through the footing and the thickness of concrete over is substantial enough, you can probably do away with the lintels. Roughly speaking, if you can take 45° lines from the edges of the 'hole' for the drain and they intersect below the upper surface, the loads should be adequately distributed to prevent the foundation cracking.

Otherwise, shutter the drain with some compressible material (mineral wool batts) and cast some reinforcement bars into the concrete above the drain (two or three 8mm dia bars about 1m long) with 50mm cover under.

A rocker section:

formatting link

Reply to
Hugo Nebula

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.