huangyhg

tremie slab/foundation
we are building a 17 story building with 2 story underground parking. the average water table elevation is at +/-12' above the proposed top of foundation elevation. what is the best scheme the foundation system in a condition as this. what is the interaction between the tremie slab and the foundation?
thanks

did you consider any of the following:
1. dewatering
2. coffer dams (using sheet piles)
good luck
is anyone familiar with building foundation over a tremie slab? or how does the building foundation work with the tremie slab from the design and construction point of view.
thanks
the tremie slab is not considered to be part of the foundation since there is a cold joint between the two and the tremie concrete is unreinforced. a typical assumption is that the foundation is sitting on the equivalent of rock.
an exception would be a pile supported foundation (piling driven inside a cofferdam before the tremie seal is placed). then the weight of the tremie concrete is often assumed to be supported by the pile - by skin friction between the pile surface and the tremie concrete. however the foundation is still considered a separate entity.
well said,
what can be done if the foundation for the building shearwalls require resistance or anchorage to prevent uplift. how can that uplift force due to wind can be transfered thru the cold joint to the piles?
thanks

when piles are used with a tremie seal they typically project up past the top of the seal where they can tie into the rest of the foundation system
thanks, for all the responses.
1. how can that be accomplished construction wise.
2. it seems to be a complicated construction process that may require special equipment and well knowlegable, experienced, and specialized foundation contractor.
this obviously, is not a run of the mill achivement. i do not know if it is possible for someone here who can recommend sucha contractor or company in general. or what is the best way to find this contractor? this is not very common practice where this project is located, south florida.
thanks again,
this type work is more common in bridge construction than buildings. if you make inquiries about experienced coastal bridge contractors you will be able to find the needed expertise.
thanks
you can build such a foundation using fabric formwork as used for bridges. basically a large flat bag
attached to vertical formwork for columns or walls with the required rebar extending into the bag.holes can be cut in the bag so that the base and the first part of your columns can poured at the same time.
how does the large bag look like? and what is it made of?
excuse my questions, i am not familiar with marine structures. is there a web site where i could check them out?

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