Tremie method of pier placement and distance between piers.
Tremie method of pier placement and distance between piers.
(OP)
I have a project with all around bad soil conditions, high water table. I need a 75" diameter concrete pier to handle the bearing pressure. I currently have it at a depth of 18' going deeper does not get me much in terms of friction resistance, so the larger bearing area is driving the design. The distance between the piers is 12'-0" - so 1.92D. I am specifying Tremie method of placement. From what I understand from the process they drill the hole then place the casing and rebar. Please correct me if I am wrong. From what I gather behind the philosophy associated with pier spacing the less compactable soil needs the higher 3D spacing because of the overflow into adjacent soil causing lift pressure. Since they will be drilling I will not have as high of a concern over compaction of the soft clay/silt/sand as it will be removed/ compacted. So I feel that the 2D spacing that I have will be sufficient. Can some of the veteran engineers please weigh in on this thought process?






RE: Tremie method of pier placement and distance between piers.
A properly used tremie should be fine. Casing and rebar are placed before concrete.
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RE: Tremie method of pier placement and distance between piers.
As an option, would ground improvement (rammed aggregate piers or vibro piers or similar) be a possible solution to your problems? don't need to answer but it may be worth exploring or asking your geotech if you are not certain.
RE: Tremie method of pier placement and distance between piers.