Posts In Rock

 
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Old 04-26-2013, 06:22 AM   #1
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Posts In Rock


I went out to look at a gate repair on a fence yesterday, somebody else installed it. They used big posts, but after feeling them, and measuring about 5.5' out of the ground, it looks like they are only 8' posts! I'm assuming they hit ledge. I saw a couple outcrops in the driveway, it looks like hard rock, maybe granite. I've put a lot of thought into trying to find cost effective ways to deal with these scenarios, but I need input. Last year I bought a 6" Pengo Agressor auger with Bolt On Rock Head.


I have a tractor with about 19gpm of hyraulic flow rate. My drive unit mounts to the side of the bucket but it's really not enough torque. Stops moving when I apply needed down pressure for rock. I was going to try renting a skid steer drive unit from a rental shop with more torque, plus I should be having it center mounted when adding down pressure. I called Pengo, they told me that the auger I bought isn't what I need for hard rock like granite, that I need a step auger and a lot of down pressure. I'm wondering if I should invest in it, if my flow rate will handle a drive unit for that auger or if I should look into other options. I've never rented a rock drill run off an air compressor, how big can you go with those? Can I drill multiple holes and break it out, put a post in and fill with concrete? I also looked into a product called dexpan, it works like blasting but works slow and doesn't blow up, just slowly expands. I'd have to drill holes for it of course. I also have a SDS-max hammer drill that I've used to drill up to 1 3/8" holes into granite.

I'm open to suggestions.

Here's the gate I need to fix


Cross braces should be 2.5x the height of the top wire. This fence is 5' tall and the cross braces are only 7.5'!

Last edited by BenFencin'; 04-28-2013 at 08:46 AM.
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Old 04-26-2013, 09:50 PM   #2
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Re: Posts In Rock


My first thought was rock drill and bust out middle for a wood post like you said but haven't done it. I don't think a wood post in a non draining hole will fair too well but the power companies do it all the time with telephone poles.

Another idea would be to weld a plate to the bottom of a square tube or pipe and drill 4 holes in the plate and secure the plate to the rock with drive-in anchors.

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Old 04-26-2013, 10:36 PM   #3
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Re: Posts In Rock


Forgot to add this: You may want to post this under excavating as well as they probably have some good ideas for punching a hole in granite.
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Old 04-28-2013, 11:49 AM   #4
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Re: Posts In Rock


Why do you have to go into the rock? Instead of a circular post hole,why not make a wide base and fill it with concrete? Throw some sand or pea gravel in first for drainage.

Last edited by GO Remodeling; 04-28-2013 at 07:25 PM.
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