underpinning 13 feet below water table any tips
underpinning 13 feet below water table any tips
(OP)
I am currently working on a project in which the next phase requires me to underpin a 7 story masonry building. the building is approx 70' long and i must underpin it 10' deep. the water table is 9' feet below grade the footing of the building is 12' below grade. I must bring it to 22' below grade. I understand that when i dewater below the buildings footings i will undermine the structure. I am considering helical piles or resistance pile to support the building and then dewatering and underpinning. Please if any one can give me some tips or ideas it will be greatful, thanks.





RE: underpinning 13 feet below water table any tips
Could you be more specific? Why do you have to underpin the building, what sort of access is inside and around the building (including height clearance inside), is there any other building nearby, what are the recommendation(s) from the Geotech people.
Thanks.
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
In any event excavation will leave some voids under the existing structure.
Grout tubes should be placed in the new wall and the voids behind pressure grouted.
Intrusion Prepakt
www.marineconcrete.com
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
You also have to consider the permeability of the ground and the flow rate into you excavation. You can't just dig a hole and hope the pumps will keep up. You may have to seal of the area before you start pumping.
Have you considered freezing the area.
Intrusion Prepakt
www.marineconcrete.com
RE: underpinning 13 feet below water table any tips
RE: underpinning 13 feet below water table any tips
I recommend that propell speak to a engineer or design build contractor who is very experienced in underpinning and excavation support in that particular location.
Where is the job?