ACIP Pile Reinforcing Design
ACIP Pile Reinforcing Design
(OP)
If the geotech. engineer is designing the ACIP(Augered Cast-In-Place) piles, who determines if steel reinforcing is required and who designes the depth of the cage and size of the reinforcing. If structural designs the reinforcing, what methods are used. Are there any guidelines or references. Looking for how this is normally handled.






RE: ACIP Pile Reinforcing Design
For example: for 16" diamter piles we have a cage of 4-#6 bars around the perimeter with #3 ties. This cage extends 20 into the pile and 2'-6" into the pile cap. We also place 1 full length (usually a #9) bar down the entire length of the pile. The exterior cage is to handle any accidental or incidental bending on the pile from lateral loads or eccentricities. The center bar is to provide ductile continuity down the entire length of the pile and to engage the entire pile when we are counting on it to resist uplift.
Others, I'm sure have different standards and opinions on the subject. Just how our office does this.
RE: ACIP Pile Reinforcing Design
RE: ACIP Pile Reinforcing Design
RE: ACIP Pile Reinforcing Design
(Full disclosure: Our local building department has modified 1810.3 to allow for the maximum stress to be only 25% of the f'c. We therefore typically use 4,000 psi grout to get back to the 100 ton capacity for a 16" diameter.)
We estimate the length based on parameters of skin friction and end bearing set by the Geotech. Final length is determined in the feild by the Geotech rep.
Uplift resistance is based on parameters given by the Geotech.
I have seen 14" diameter ACIP piles. I personally have never called for or seen anything smaller than a 14" dimater piles. Doesn't mean they are not out there, just have never seen them used around my area.
Might check with a local installer to see what the smallest they typically do in your area.
RE: ACIP Pile Reinforcing Design
RE: ACIP Pile Reinforcing Design