I need to set two 4"x4" in aluminum fence post through the concrete in my
driveway/walkway. This is for an aluminum ornamental fence between my house
and deteched garage across the breezeway.
I figure I could rent a core driller from Lowes to drill two 6" holes in the
concrete (~4" thick) But I have to dig the post hole to a total depth of
24." I cant get a post hold digger through a 6" hole. I wonder if the cure
driller can be lowered to make a 24" deep core? The soil under the concrete
is hard gummy grey clay (Houston Tx).
I know I could rent a small augger but I'm trying to save some money and
find a cheaper way. I have a post hole digger for the other 3 holes (5
total) so it won't be too bad once the get is installed.
So, any ideas for digging out soil under a 6" diameter hole in concrete?
Besides a teaspoon. :)
Are the aluminum posts hollow? Probably!
If they are, you could drill a smaller 1" or 2" hole thru the concrete
and then use a sledge hammer to drive a 1" or 2" steel/iron pipe into
the ground and then put the aluminum posts over the steel pipes. You
could put wood inside the aluminum to pad the spaces between the two
posts or allow them to touch directly. The dissimilar metals should
not be a problem for many years.
How about jamming a 5" diameter piece of vent pipe (two feet long)
down the hole in the concrete, and sticking a garden hose down to the
bottom while you chop at the clay with a prybar or similar and washing
the debris out of the hole. It ought to be real quick, but maybe a bit
messy. They do oil wells that way, don't they?
I think maybe I would just dig out as much as possible with a little garden
hand shovel and then drive the pipe straight into the ground with a sledge
hammer. Or if you prefer tap with hammer then pull up and clean out the
pipe, then hit the hole again, keep doing this cycle until your deep enough.
Then cement the top of the hole.
Or you could also use a round end post (for chainlink) and use it to plug
drill the hole, just keep moving it around until the hole is big enough to
Take your posts and specifications to a local fence company and have
them convert them to "plated posts". These will then bolt to the
concrete eliminating the need to cut the concrete or make large holes.
I have a VERY large patio fully fenced-in with chain link fabric
attached to a dozen or so plated posts. Of course, you will need a good
hammer drill and masonry anchors.
I've had good luck doing this. Get some scrap pipe - 2" EMT
electrical conduit works well. Drive into the dirt and pull out a
plug. Repeat until complete. You can even bell the hole. If you
have plenty of pipe, just keep using it up. You could use some
type of rod to clear the pipe.
Keep the whole world singing . . . .
WOW, A lot of excellent ideas and things I haven't thought of.
I think I try the plug drill technique first. The clay should help with
that as I recall it sticking to my shovel when I dug at flower bed. If
thats going too slow, I'll try the oil drillers technique. I'm in the oil
drilling business, why didn't I think of that.
I also like the idea of expansion joints around the posts. I'm in Houston
and summers get scortching hot. but winters are mild with the occasional
freeze during a cold front.
I'll talk with the fence company about the corrosion of aluminum against
fresh quickcrete. They claim their powder coating is tough as they come and
offer a lifetime guarantee on the finish. I'll have to see if it covers the
part that stick into the ground. Theis instructions don't call for
thanks for all the input.
This is an awsome group.
If you do anything below the surface of the concrete, you're betting it's
going to be good for life, or at least until the next buyer. Any breakage
or corroding off of the posts, and you have no way to replace it. Aluminum
corrodes terribly. I'd surface mount them.
In my area some fences/patio covers are made with Aluminum, a product
called alumawood <sp> . Looks like wood, with visible grains ...
Any post anchored on the pad is on the surface mount. One built in '95
still stands is not corroded.
I just got a email from Jerith and they suggested not putting expansion
joints but instead using hydraulic cement or grout around the poles to take
up the slab expansion. They didnt like expansion joints because they will
get loose over time and pull the gate out of alignment.
They also said that their powder coating is protection from the corrosive
affects of cement.
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