Re: [RE-wrenches] Tying a ground mount to sandstone slab
One word: Ballasted. William Miller On Dec 23, 2012, at 9:03 AM, Mac Lewis maclew...@gmail.com wrote: Hi Wrenches, I am working on a project right now where we need to figure out how to put an 8kW ground mount on a property that is covered with a sandstone slab. ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Tying a ground mount to sandstone slab
I have used Wedgebolts to attached to natural surfaces in the past. Better than expanding lags/wedges because they don't split out in softer materials. I would use the Red Brick values as a start and contact the manufacturer for guideance. http://www.powers.com/pdfs/mechanical/07246OTSS.pdf or similar. Best Regards, John Berdner General Manager, North America [cid:image001.jpg@01CDE0F4.EF92CDB0] 3347 Gateway Boulevard, Fremont CA 94538 USA (*Please note of our new address.) T: 510.498.3201 ext 747 M: 530.277.4894 From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mac Lewis Sent: Sunday, December 23, 2012 9:03 AM To: RE-wrenches Subject: [RE-wrenches] Tying a ground mount to sandstone slab Hi Wrenches, I am working on a project right now where we need to figure out how to put an 8kW ground mount on a property that is covered with a sandstone slab. Does anyone have any advice on how to do this? My preliminary idea is to drill down about 12 and epoxy rebar into the sandstone, and pour a square pier about 2'x2'x2' on top that holds the upright support in place. Any thoughts or comments about this or ideas about other ways to approach this are appreciated. Thanks in advance -- Mac Lewis Yo solo sé que no sé nada. -Sócrates CONFIDENTIALITY NOTICE: This e-mail and its attachments are intended only for the use of the individual or entity who is the intended recipient and may contain information that is privileged, confidential and exempt from disclosure or any type of use under applicable law. If the reader of this e-mail is not the intended recipient, or the employee, agent, or representative responsible for delivering the e-mail to the intended recipient, you are hereby notified that any dissemination, distribution, copying, or other use of this e-mail is strictly prohibited. If you have received this e-mail in error, please reply immediately to the sender. P Please think of the environment before printing this email inline: image001.jpg___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Tying a ground mount to sandstone slab
The ballasted idea is good, and I've also done what you are proposing below, which is a hybrid ballasted/ anchored system. Epoxy is the best anchor I've ever used, just make sure the hole is really clean before putting in the glue. Also I'd make the slab bigger to enhance the ballast effect. I did a pole mount on top of solid rock on a 4'x 4' x 16 thick slab with lots of rebar, and j bolts. We then welded a bolt-on flange to the base of the pole to bolt to the j bolts. You may want to talk to a structural engineer; all of this is very calculable. I use a simple 50 lb/ sq ft loading on the face of the array, and work everything back to tipping moment at the pivot point (either the base of the pole or the edge of the slab.) You could even set the anchors and then use a crane scale and high lift jack to test the pull out strength of the anchors if you wanted to get anal. http://www.northerntool.com/shop/tools/product_120532_120532 Ray On 12/23/2012 10:03 AM, Mac Lewis wrote: Hi Wrenches, I am working on a project right now where we need to figure out how to put an 8kW ground mount on a property that is covered with a sandstone slab. Does anyone have any advice on how to do this? My preliminary idea is to drill down about 12 and epoxy rebar into the sandstone, and pour a square pier about 2'x2'x2' on top that holds the upright support in place. Any thoughts or comments about this or ideas about other ways to approach this are appreciated. Thanks in advance -- Mac Lewis * Yo solo sé que no sé nada. -Sócrates * ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
