Auger Cast Piles and Tiebacks

[Dasovich]

Can anyone recommend good reference material for the design of augercast pile walls with tiebacks? I need to familiarize myself with the process and what's involved.

Thank you in advance.

 

[DRC1]

I would not recomend augercast piles with tie backs. Augercast piles do not have much bending resistance and the tie backs will induce considerable bending. Hpiles work best with tie backs, but must be driven or vibrated. If you have driving restrictions, drilled in mini piles with the casing left in pplace can be made to work

 

[jheidt2543]

Could you be thinking of "Chance Anchors" or "Soil Nailing"? Do a search on the web for "Chance Anchors" and see if they have an authorized contractor in your area. They may be able to help you with some information.

 

[Focht3]

DRC1 is right - augercast piles are not the answer. Casing can be left in place, but this can be expensive since the casing must be protected from corrosion (for permanent installations, not construction expedients.) You need a rebar cage to pick up the tensile forces in the laterally loaded shafts. Augercast piles can't do that.

Drilled shafts also work quite well - I have used cantilever (no bracing or tie-backs) and tied-back drilled shaft walls for quite a few projects in the Houston area. Depending on the ground conditions and locally available equipment, individual shafts can exceed 1.37 meters (54 inches) in diameter. Cantilever walls were for temporary excavation bracing (less than 6 months) and were monitored with inclinometers. If your cut is less than 7 meters tall, consider a cantilever setup.