1) When we use this option, we bring the PVC conduit into the Sonotube below frost level.
2) We had a similar situation & after consulting with an engineer, widened the form at the top, just below the ground according to his calculations - turned out almost to be a patio. Then they were buried. So I recommend finding an engineer to evaluate the TPM requirements and adapt a foundation to an equivalent. Good Luck! Glenn Burt From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Rich Nicol Sent: Saturday, April 16, 2011 10:55 AM To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Pole Mounts - Frost/Conduit & Ledge Hi RE-Wrenches 1. When installing pole mounts I have been running conduit into the side of the foundation and up the pole prior to pouring concrete. The conduit enters the foundation ~ 18" to 24" below grade level. We live in an area where frost depths are around 48" deep. I have been told by folks in the construction industry that frost will not be problem with the conduit entry but I remain concerned that the conduit may be lifted, while the foundation which runs to below the frost depth, remains stationary thereby breaking the conduit. Any insights? 2. Secondly, does anyone have experience with ledge in respect to pole mounts. I know the answer is to consult an engineer, but I thought I would bring it up to the experienced folks in the trade first. I have two mounts scheduled for this spring where I expect to hit ledge. The first is a TPM with six 230 watt modules and the second is with eight 230 watt modules. I'm expecting ledge to be relatively close to grade level, perhaps around 12 to 24" deep. Ledge in these locations is solid (generally granite, sometimes gneiss or basalt). My initial thought is to form a larger rectangular foundation with pins drilled at 45 deg angles into the ledge and tied to the reinforcing within the foundation. A wide base on the pole would then be bolted to the foundation. Any recommendations? Thanks Rich
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