On 23 Nov 2005 02:29:08 -0800, a particular chimpanzee named
randomly hit the keyboard and produced:

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.

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 |
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