Posthole Digger Options for Fencing Across Boulders

[Garthhh]

I'd like to go across instead of around some large granite boulders [at ground level]
I have a 30hp yanmar tractor, which gives me access to PTO & hydraulic power
T-posts or pipe posts
I could weld plates & wedge anchors on the bottom of the posts
I'm not sure how permanent of a solution that would be?
we are trying to expand our horse pastures

suggestions?

 

[flusher]

I'd like to go across instead of around some large granite boulders [at ground level]
I have a 30hp yanmar tractor, which gives me access to PTO & hydraulic power
T-posts or pipe posts
I could weld plates & wedge anchors on the bottom of the posts
I'm not sure how permanent of a solution that would be?
we are trying to expand our horse pastures

suggestions?

Wedge anchors would work since it's only a non-loadbearing fence post. You'd need a jackhammer to punch holes in the granite for the anchors. Rent a Bobcat with a jackhammer attachment.

 

[CharlieS]

Years ago, an acquaintence fenced off 40 acres of pasture, some of which contained alot of rock. His solution was a heavy duty hammer drill w/ a bit large enough (2+ inches) to bore a hole large enough for a T post with the spade removed, he then concreted them in with brick morter. Tough way to go about it but it's an option.

 

[Garthhh]

Years ago, an acquaintence fenced off 40 acres of pasture, some of which contained alot of rock. His solution was a heavy duty hammer drill w/ a bit large enough (2+ inches) to bore a hole large enough for a T post with the spade removed, he then concreted them in with brick morter. Tough way to go about it but it's an option.

if it didn't cost $8k I'd get a rock drill attachment:licking::laughing:
thought about renting a concrete boring tool

 

[clemsonfor]

Get a big @$$ hammer drill from a rental place and set anchor bolts or threaded bar into it or angle iron. Either cement them in or use epoxy then either bolt the post down in some way or weld it to the angle you put in there. I think renting a drill and welding would be cheap. Course this assumes you have a welder and you have a generator to get power to the field, and that you can weld.

 

[greg_g]

The concrete in my basement has been curing since 1936, and is resistant to drill bits of any kind. Kinda like granite. So I bought a .22 caliber pin driver, worked like a charm. The trick is to buy pins that are stronger than what you're trying to shoot them into. I know they're available in .27 caliber, perhaps even 32 caliber. Check here as a starting point.

If you can rent something like that locally, then knock off the T-post spades. Cut the posts to the desired height, then weld the spade back on (horizontally) like a foot. Drill a few holes, pin the spade in place with the pin gun. Like the man said, it's not load-bearing. All you want to do is hold the T-post in a straight line with the rest of them.

//greg//

 

[Garthhh]

The concrete in my basement has been curing since 1936, and is resistant to drill bits of any kind. Kinda like granite. So I bought a .22 caliber pin driver, worked like a charm. The trick is to buy pins that are stronger than what you're trying to shoot them into. I know they're available in .27 caliber, perhaps even 32 caliber. Check here as a starting point.

If you can rent something like that locally, then knock off the T-post spades. Cut the posts to the desired height, then weld the spade back on (horizontally) like a foot. Drill a few holes, pin the spade in place with the pin gun. Like the man said, it's not load-bearing. All you want to do is hold the T-post in a straight line with the rest of them.

//greg//

yeah a ramset
Amazon.com: Remington 476 Light Duty Powder Actuated Tool: Home Improvement
hadn't thought of that, used one years ago
the granite isn't all that hard
this is a spring time project
even if I were to need a post to be some what stable, I would just make more like a tripod

our horses respect fences, cept that whole grass is greener thing

 

[RPW]

Dynomite

 

[hosspuller]

I would go with your first thought. Weld 1/4 thick plates to the posts. Use a 1/2 hammer drill and wedge anchors. Grout under the plate to level the posts and prevent moisture intrusion.

 

[Redneck in training]

How tall fence you need? Is it electric or barbed wire? For electric I would use fiberglass posts. They are about 3/8 in diameter and the hole for them won't be too hard to drill. Other option is to use a form such as plastic bucket, concrete the post in and have it free standing.