Originally Posted by
brian schmitt
i don't understand why a relieving arch can,t be made of dirt when a pipe is run say 12"s below the bottom of the footing?splain it to me
Brian,
I will *try to* 'splain it to you where you can udderstan' it.
"why a relieving arch can,t be made of dirt when a pipe is run say 12"s below the bottom of the footing?"
Q. Okay, first, what is the footing bearing on?
A. The soil beneath that footing.
Q. What bears on that footing which is bearing on that soil?
A. The entire load of the house above that part of the footing, and, if under a load bearing column, more of the structure's load that what is just above that footing area.
Q. What does that soil below the footing bear on?
A. More soil beneath that soil.
Q. What would happen is that soil beneath the soil beneath the footing were removed, or allowed to collapse?
A. The soil above would cave in to the void created by such collapse.
Q. What would happen to the footing above when that happens?
A. The footing above would not have its designed soil bearing support and could shift, allowing the structure to shift.
Q. What if the structure did not shift and the only thing which happened was that collapse of the soil beneath the soil supporting the footing?
A. The pipe in that collapsed soil has collapsed due to the load on it from above, and, while the structure may not have suffered any noticeable effect, the collapsed pipe is now blocked with soil.
Q. What does a blocked sewer pipe cause?
A. Sewers to back up and cause your cup to runneth over.
And your bowl too.