Drilled Pier Spacing
Drilled Pier Spacing
(OP)
Does anyone have a recommendation on drilled pier spacing? I've read in a foundations book from college, "3 diameters center to center". Does this make sense for belled piers also?
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RE: Drilled Pier Spacing
www.SlideRuleEra.net
RE: Drilled Pier Spacing
Dik
RE: Drilled Pier Spacing
RE: Drilled Pier Spacing
1) Make sure they aren't close enough together that you get interconnection of concrete between the drilled shafts. This is especially important when constructing nearby drilled shafts on the same day.
2) If drilled shafts are too close together, then group effects come into play and the group tends to act as a single foundation.
In the first case, we normally recommend a minimum of 4 diameter from edge to edge. In the second case, it depends on the number of piers in the group and the soil conditions.
To answer your question, the diameter would be the belled diameter.