Cantilever Solider Beam in Drilled Shaft
Cantilever Solider Beam in Drilled Shaft
(OP)
For a cantilevered steel soldier beam installed in a drilled shaft we have always used structural concrete (3ksi) to fill the shaft around the beam below the bottom of cut, and used lean mix to fill the shaft the rest of the way up.
We are looking at just using the flow fill over the entire height as it is still stiffer than the soil in this instance. I wanted to get a feel for what are other designers practices are with regards to this (concrete/flow fill/etc)?
We are looking at just using the flow fill over the entire height as it is still stiffer than the soil in this instance. I wanted to get a feel for what are other designers practices are with regards to this (concrete/flow fill/etc)?





RE: Cantilever Solider Beam in Drilled Shaft
RE: Cantilever Solider Beam in Drilled Shaft
www.PeirceEngineering.com
RE: Cantilever Solider Beam in Drilled Shaft
Also, pouring structural concrete in the pile toe and then flowable fill above is definitely not the same amount of work as pouring flowable fill full height. It's a pain to build them that way, plus you're pretty much guaranteed to have a few piles where the structural concrete is poured too high, which makes lagging installation a nightmare. The price will reflect all of this.
RE: Cantilever Solider Beam in Drilled Shaft
RE: Cantilever Solider Beam in Drilled Shaft
www.PeirceEngineering.com
RE: Cantilever Solider Beam in Drilled Shaft
My primary concern with the flow fill (or in this case a weak cement slurry) is that instead of utilizing a 30" width of shaft to push against the soil, I have something closer to the flange width of the beam itself. My thinking is that this will result in some movement of the beam withing the flowfill in addition to movement of the shaft in the soil resulting in greater overall movements of the soldier beam, but the bending in the beam will not change much.
RE: Cantilever Solider Beam in Drilled Shaft
www.PeirceEngineering.com
RE: Cantilever Solider Beam in Drilled Shaft
But it the shoring is intended to be permanent shoring, I would use the stronger concrete below the lowest excavation point.
How's that for the middele ground?
Mike McCann
MMC Engineering
RE: Cantilever Solider Beam in Drilled Shaft
www.PeirceEngineering.com
RE: Cantilever Solider Beam in Drilled Shaft