Structural Engineering Problem
Ok, I have an sturctural engineering problem I am working on and I thought I would ask you folks for your opinons and procedures:
The problem. I need to jack/push a 8' pipe thru a wall aproximately 20' thick. The wall is made up of 4 arches, two stacked over two and the pipe needs to pass thru the bottom two. The bottom two is filled with rubble, the top are hollow. We can't have any movement of the structure. We do not want to lose alot of the rubble fill during the pipe installation, except for the pipe volume, even though the rubble is not belived to be structural. We are going to grout the rubble voids in the bottom two arches prior to pushing the pipe, but there is no backpressure, so there is no way to know if the entire rubble in the area of the pipe push is completely grouted.
I was thinking of drilling and pushing consecutively larger pipes, maybe 2' first, then a 4', then 6' then 8', each time either pushing the previous pipe out, or cutting it out , as the larger pipe takes it's place.
Do you engineers on here have any better methods for doing this? I am open fo any ideas.