I installing Classico Pavers on a 24 foot circle of sand wher a above ground pool used to be located. My intent is to eventually build a eight sided gazebo with a 24 foot diameter in this spot with the pavers being the floor. I would like to use aluminum columns as the post but do not know how I could secure them to the concrete piers wihich will be 18 inches deep in the ground under the columns. Any Ideas are most appreciated.