Pipe Pier Plan. Possible? Probably.
Posted 21 September 2012 - 11:06 AM
A hole about 12" in diameter was dug with an auger to a depth just over 4'. A 10' diameter patio stone was lowered into the hole to prevent the pipe from 'drilling' further down into the soil. The pipe was then put in the hole, made vertical and guyed in place very securely. Concrete was poured around the pier to ground level. Everything was left to dry for a few days.
The pipe was filled almost to the top with beach sand 'liberated' from a Provincial Park nearby which helped damp resonance and vibration.
This pier has functioned perfectly, he says, for the past 20 years. When I have observed at his observatory I tried the rap test. I gave the top of the pier a good smack while looking through the eyepiece. The damping time was well less than one second! He also told me he has not had any problems with the pier tilting over time.
The question is, should I copy this design? I'll be mounting a 6" f/8 APO on a Mach 1 GTO on my potential pier. Any caveats?
Posted 21 September 2012 - 11:42 AM
Posted 22 September 2012 - 02:49 AM
Posted 26 April 2013 - 02:44 PM
Posted 26 April 2013 - 03:54 PM
Posted 30 April 2013 - 06:49 PM
If you see and know it works, why not go with it. I made mine of concrete. Rap test? No vibration. 18 years now.