[rhines81]

I did something like what Worth suggested above. I cut myself (4) 12 foot ~1x1 poles out of 2"x6"x12' pressure treated board and spaced them in a 8ft x 2ft rectangle buried about 2ft. At the top, I screwed in more cut 1x1s to connect the vertical poles. Then I just took regular old string and tied it to the top rails to hang down loosely to the ground. The beans just grab those strings and climb to the top. You could do the same using (3) 12'x2' or 12'x3' frames put together. I think my frame with string cost less than $12 and took about an hour to cut and assemble.

Edited: I just went out and looked at my frame, must have only used 8 foot lumber for the verticals, because it is only about 6' high. You would think I would have remembered only from a year ago.