Timber Pile Uplift Anchor

[tngolfer]

Does anyone have a timber pile uplift anchor they are comfortable with?

I have a project in Mobile, AL, that is in bad upper soils. The geotech recommended timber driven piles and gave me pile lengths/sizes with allowable compression and tension capacities. Because of the high wind zone and the 1 story wood construction, I am getting uplift in the ends of my shear walls.

Thanks.

 

[Mauleflyer]

I have had this condition only once and we used a commercially availble uplift anchor. That may be your best route.

 

[SlideRuleEra]

On the South Carolina coast, timber piling for residential and light construction are typically drilled and through-bolted to structural members to resist uplift.

If you want to check on manufactured products, download both the TECO Catalog and Design Manual at this link:

http://www.clevelandsteel.com/divisions/construction/construction.htm

I have not looked recently, but they may have something you can use.

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[msquared48]

As SlideRuleEra says, I would construct a steel cap with sidewalls to thru-bolt thru the pile, and provide a horizontal steel plate welding surface on the top to weld rebar to to develop the uplift to the piling. The steel cap would need a minimum 3" cover of concrete provided by the pilecap, so the pile embed into the pilecap may have to be 12" or greater depending on the vertical length of the steel cap side plates.

Vertically lag screws into the endgrain of the piling are a no-no. Nix, Nyette... You must bolt through the side.

Mike McCann
MMC Engineering

 

[tngolfer]

Thanks for the replies.

SlideRule, I used the cleveland product as a starting point. I didn't particularly like the bent plate connection for the same reason as J and L bolts are being phased out. I decided to go with my own connection and bend a gage strap into an inverted "U" shape and connect it to the top of the pile with through bolts.

Thanks again.