Tremie Slab
Tremie Slab
(OP)
Looking at a cofferdam with a tremie slab. Heavy uplift on slab. Will have tiedowns to resist the uplift. How do you check the capacity of the slab in bending and shear if it is unreinforced?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Tremie Slab
RE: Tremie Slab
RE: Tremie Slab
Is 1550 psf your net uplift? A 4.5' slab is good for 405 psf including the 0.6 factor.
You can always use ACI Chapter 22.
RE: Tremie Slab
Is Chapter 22 the provisions for Plain Concrete Design? If so, that would seem appropriate.
BA
RE: Tremie Slab
RE: Tremie Slab
RE: Tremie Slab
RE: Tremie Slab
BA
RE: Tremie Slab
RE: Tremie Slab
I agree it would be difficult but if the reinforcement could be held in place underwater, perhaps it is possible.
BA
RE: Tremie Slab
RE: Tremie Slab
Are you able to just install the sheet piling deep enough below bottom of footing so that you can excavate and dewater to the bottom of the footing without using a tremie seal and without causing a quick condition?
If the excavation is being made to top of bedrock, you could drive the sheet piling to rock, excavate (possibly in the wet) and install multiple tiers of bracing, excavate in the wet to rock, install tiedown anchor (dowels?), then pour the tremie seal. And yes, the tremie seal concrete will need to be reinforced unless it is think and massive enough to have minimal shear and bending stresses.
www.PeirceEngineering.com
RE: Tremie Slab
Will have to install rock anchors or augercast piles, excavate in the wet and place the tremie. I have included reinforcing steel in the preliminary design.