pre-stressed concrete piles
pre-stressed concrete piles
(OP)
Hi every one,
Does anyone know what the effect of cutting the pre-stressed strands to adjust the top pile elevation and weather the epoxy dowels to connect the pile to the pile cap is better than exposing the strands during the cut off procedure and tie them to the pile cap reinforcement, if this way is acceptable , how long is the exposed length should be? Does regularly reinforced piles when exposing top rebars provide better connection with the pile cap?
Thanks
Does anyone know what the effect of cutting the pre-stressed strands to adjust the top pile elevation and weather the epoxy dowels to connect the pile to the pile cap is better than exposing the strands during the cut off procedure and tie them to the pile cap reinforcement, if this way is acceptable , how long is the exposed length should be? Does regularly reinforced piles when exposing top rebars provide better connection with the pile cap?
Thanks






RE: pre-stressed concrete piles
The guys doing this aren't exactly swiss watchmakers. Trying to get them to cut around the strands (or bars) is going to be tough. If you need additional uplift capacity, just embed some bars in epoxy.
RE: pre-stressed concrete piles
Dik
RE: pre-stressed concrete piles
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RE: pre-stressed concrete piles
www.PeirceEngineering.com
RE: pre-stressed concrete piles
RE: pre-stressed concrete piles
Those details would work fine where the level is predetermined, but when the driven depth varies and you saw off the top, you remove at least some of the sleeve. How is that handled?
RE: pre-stressed concrete piles
RE: pre-stressed concrete piles
nader666, the prestressing strands are fully bonded. Therefore, cutting off the top of a pile will not debond the strands.
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RE: pre-stressed concrete piles
www.PeirceEngineering.com
RE: pre-stressed concrete piles
We have exposed prestress strand for embedment in the cap but the strand usually gets damaged - it's sensitive stuff to nicks, and we have to dowel anyway. And it's hard to find the bond values for strand - I've got the numbers in my notes somewhere.
Bob
Trouble with vertical hairline cracks when driving piles? You need additional tie reinforcement - See papers by Ben Gerwick.