Keying of pile into pile cap 2

[K Baaru]

Hi friends,

I want to know how to do keying of pile into pile cap.

 

[dik]

Concrete or precast piles, you extend the reinforcing. With steel piles, you can weld reinforcing or headed studs to transfer the load.

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-Dik

 

[BridgeSmith]

For concrete columns, drilled shafts, or caissons, in addition to the reinforcing, we provide a shear key in the concrete, by forming a pocket about 2" deep in the top of the shaft, and with square plan dimensions approximately 40% of the diameter. So for a 36" circular shaft, the formed keyway would be 2" deep and 15" by 15".

Rod Smith, P.E., The artist formerly known as HotRod10

 

[le99]

I don't quite understand the word "keying". If it is meant to relieve the pile of fixity, simply cut the pile below the bottom mat of the pile cap reinforcement will do. No reinforcement shall be extended into the pile cap then.