Minimum Edge Distance
Minimum Edge Distance
(OP)
Is there a minimum recommended edge distance from centreline of pile to outside edge of pile cap/grade beam? or from outside edge of pile to outside edge of cap/grade beam?
Dik
Dik
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RE: Minimum Edge Distance
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RE: Minimum Edge Distance
rod-busters.
Bob G.
RE: Minimum Edge Distance
Dik
RE: Minimum Edge Distance
Dik
I have seen this dimension vary from 4" to 8" accros a variety of projects. I have seen 4" used for 2-pile pile caps and 8" for larger 6/8-pile pile caps. Personally, I prefer to keep the dimension 6" unless I am really trying hard to reduce concrete volumes. 6" in my opinion allows enough distance to gain sufficient development in the reinforcement when considering the 3" pile location tolerance.
Regards
RE: Minimum Edge Distance
Beside dimensional requirement, generally 1.5 times pile diameter is used for pile center to the outside edge of cap.
RE: Minimum Edge Distance
kikflip... good link
STRE... design handbook for CSA A23 by PCA, has 2x pile dia... I don't know the source, but think it's excessive. I've never encountered that large... 1.5x pile dia seems huge... 24" for a 16" dia pile.
thanks, Dik
RE: Minimum Edge Distance
1808.2.4 Pile caps.
Pile caps shall be of reinforced concrete, and shall include all elements to which piles are connected, including grade beams and mats. The soil immediately below the pile cap shall not be considered as carrying any vertical load. The tops of piles shall be embedded not less than 3 inches (76 mm) into pile caps and the caps shall extend at least 4 inches (102 mm) beyond the edges of piles. The tops of piles shall be cut back to sound material before capping.
And in High Velocity Hurricane Zones (HVHZ)
1822.1.6 Reinforced concrete caps shall be provided for all pile clusters and such caps shall extend laterally not less than 6 inches (152 mm) beyond the extreme pile surface and vertically not less than 4 inches (102 mm) below the pile butt. Pile caps may be omitted when piles are used to support grade beams, provided that the spacing of Section 1822.1.4 is complied with, and provided that the portions of the grade beams acting in place of the pile cap shall be computed by a recognized method of analysis to properly carry the loads.