GalileoG
Structural
- Feb 17, 2007
- 467
We're currently designing a one bay steel bracing system to be erected inside an existing building and that means we will have to pile inside building. I have several questions that I would like to pose:
1. We would like to have our two piles spaced as far apart as possible in order to reduce the vertical reactions on the pile and the axial forces on our members. However, there are existing 17" diameter piles in the area. We have assumed these piles are friction piles because of their small diameter. We also do not know their length. My question is: how close can I bring the new piles to the existing piles without comprising its capacity? We estimate that our new piles will be about 3' in diameter. I am sure the answer is one that is extremely complicated and one that requires detailed calculations, but is there a rule of thumb out there? Ideas and thoughts?
2. There was a geotechnical report performed on a parking lot that is about 50-60 meters away from the point of interest. Are the results from this geotech report still applicable? I guess what I am trying to ask is: at what distance from an area that was previously tested would its report not be applicable anymore.
3. Piling inside an existing building poses challenges. I am curious as to what logistic problems I can expect to experience? What kind of piles should I be looking at for ease of erection inside an existing building?
I am sure these are trivial questions to you, but I have little to no experience in subsurface structures! I would really appreciate your thoughts and input.
Clansman
"If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.
1. We would like to have our two piles spaced as far apart as possible in order to reduce the vertical reactions on the pile and the axial forces on our members. However, there are existing 17" diameter piles in the area. We have assumed these piles are friction piles because of their small diameter. We also do not know their length. My question is: how close can I bring the new piles to the existing piles without comprising its capacity? We estimate that our new piles will be about 3' in diameter. I am sure the answer is one that is extremely complicated and one that requires detailed calculations, but is there a rule of thumb out there? Ideas and thoughts?
2. There was a geotechnical report performed on a parking lot that is about 50-60 meters away from the point of interest. Are the results from this geotech report still applicable? I guess what I am trying to ask is: at what distance from an area that was previously tested would its report not be applicable anymore.
3. Piling inside an existing building poses challenges. I am curious as to what logistic problems I can expect to experience? What kind of piles should I be looking at for ease of erection inside an existing building?
I am sure these are trivial questions to you, but I have little to no experience in subsurface structures! I would really appreciate your thoughts and input.
Clansman
"If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.
