Flagpole Foundation Details 2

[Berniedog]

We have been asked to design a foundation for a high flagpole for a Court House. We can handle the foundation design but does anyone know of standard details for inserting the pole into the foundation? The Fabricator is showing inserting hte aluminum pole into a steel sleeve. Steel and aluminum should not touch.

 

[civilperson]

Anodized aluminum and galvanized steel can work well in contact with each other for your flagpole.

 

[csd72]

And if the steel sleeve corrodes, the problem is?

You still have the surrounding concrete to resist the bearing of the pole.

 

[bridgebuster]

This link leads to a table about galvanic corrosion:

http://www.engineersedge.com/galvanic_capatability.htm

you can search this web site for flagpoles because the question has come up before. The weight of the flag and the effect of the wind on the flag can be tricky.

The National Association of Architectural Metal Manufactures web site has some info:

http://www.naamm.org/

 

[hokie66]

The ones I have seen have used a sleeve much larger than the flag pole, and the annular space is grouted. Separates the materials and allows for plumbing the pole.

 

[archeng59]

I designed a steel flagpole base recently and used the NAAMM information. I recommended that the portion of the base be G90 galvanized that is inserted into the pier. The client argued that the galvanizing is not needed. I did not waiver on my recommendation. What do the rest of you do about that issue?

I used a drilled pier with a corrugated steel sleeve that was larger than the flagpole. The space between the pole and the sleeve will be filled with compacted sand. There is a typical detail in the NAAMM design guide.

 

[csd72]

One thing that I have noticed is that zinc and aluminum are right next to each other on the corrosion tables. I think this means that they dont have too much of a tendency for galvanic corrosion between these 2 metals.