[TowerTalk] Above Ground Foundation

[Dennis W0JX]

Rudy:
Your tower foundation is sitting atop an unstable base. One and a half feet below ground is certainly not above the frost line so you have a "floating" foundation which may or may not move. If I have calculated it properly, you have 18.5 cu yards of concrete in your base. That is pretty darn heavy and it may well be stable enough. Depends on the windload you will have at the top. I recommend that you get some professional engineering calculations done on your installation.
 
By the way, concrete foundations are poured in water all the time. So you could have had a normal hole dug, pumped out the water, and filled the hole quickly with concrete.
 
73, Dennis W0JX/8