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garden architectureûstacked concrete columns

thread507-44203

garden architectureûstacked concrete columns

garden architectureûstacked concrete columns

(OP)
What is the proper foundation for the following column construction? Is there a formula?

I am seeking to build a row of 7ft columns with 2x6 redwood beams atop. The structure is to act as a pergola between my house and my neighbor's.

Each column will be constructed with hollow
-8in diameter 1ft high 1 1/2" thick concrete tubes.

I want to pour a foundation to accomodate a 2 3/4" x 7ft high (above ground) metal fence post. Then I want to thread a each column over the post and backfill with pea gravel.

The finished design of each column will have an 8" high base (1ft dia at ground tapering to 8in) and crown.
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