You, poured concrete around concrete. What did you use to make the new concrete adhere to the old concrete?? Also, how much weight is going on top of the concrete pier?? Mount, scope, everything. Also, what is the OD of the pier with the new concrete added?? Last but not least, how high is the top of the pier from its base at ground level??
I installed rebar to stabilize the new concrete so adhesive was not needed. The original pier is encased in high strength concrete.
As far as weight...good question and I do not have an accurate answer.
The scope weighs close to 100 pounds + 100 pounds of counter weight + weight of Byers 812 here I am guessing about 60 pounds + steel pier about 40 pounds comes to about 300 pounds on the concrete pier.
Diameter of pier with new concrete is staggered from about 36 inches to 10 inches. So I now have a pier base 4 feet deep in the ground and 36 inches in diameter, next section is 30 inches in diameter and about 2 feet in height, then a section 16 inches in diameter and 2 feet in height and finally a section 10 inches in diameter and about 1 1/2 feet in height. Looks kind of like a layer cake.
The 8 inch steel pier is 3 feet in length and bolted to the concrete pier with 12 inch steel lag bolts set in the concrete pier.
Height of pier including the steel section is about 8 feet from ground level. I am estimating these dimensions.
Will this enable a calculation of some sort?
My enhanced pier seems pretty stable and is a huge improvement over my original pier.
I had used the original pier to mount my 16 inch Cave Astrola reflector for years with very satisfactory tracking for visual use, but the pier was not up to handling my folded refractor scope.
Lesson I learned...the pier must be massive.