I have an 8 foot gate which opens in the middle. Each gate has a bent
bar toward the bottom that is put in a hole in the ground to help keep
the gate closed. Recently I had concrete poured in the area and they
covered the holes. I want to drill holes into the slab so I can use
the bars again. I am concerned that water will get into the holes,
freeze, and crack the slab. Is this a valid concern? If yes, what can
I do to reduce this risk?
On 12/29/2004 11:07 AM US(ET), firstname.lastname@example.org took fingers to
keys, and typed the following:
Drill the holes deep enough so that they penetrate the full depth of the
concrete (4"?) and drain into the stone or ground beneath.
Another suggestion is to drill the holes wide enough to be able to
insert a short piece of steel pipe into the hole. Any ice will have to
expand the pipe before cracking the concrete. Another advantage is that
the steel bar won't be banging against the concrete sides of the hole
when the wind is blowing.
Suggestion (a) is possible, but more likely to lead to a formation of
cavity under the slab near the holes if there is a slope and used much
sand...I don't think I personally like that idea too much...
If one were to put the pipe in the hole, I'd recommend using a sealant
around the outer edge and have it shorter than the hole depth by a
little bit in order to minimize the freeze-thaw around the outer edge
and the concrete...
We've got a couple of these in shed driveway areas that have been just a
hole that have been there since the barn was built in 1918 and they've
not expanded greatly in that time w/ KS winters and being in a corral
for the first 50 years of that time before we moved the corrals away
from the barn. Since the hole is open on the top the water column
simply rises rather than being trapped in narrow cracks such as a wall.
On occasion one has to shake the shed door a couple of times to pull the
pin, but normally there's not sufficient thickness to make pulling it
I did this to make a receiver for my two drop pins:
I cut the ends out of a bigger coffee can. I used this as a sonotube. I
put two pieces of 1/2" black sprinkler pipe over the bottom of the pins to
keep the holes open. I poured concrete around them.
Since you have an existing piece of concrete, you could drill 5/8 or 3/4
holes, insert the short pieces of pipe, drop the pin/s to align, and pour a
small amount of pourstone in the void between the plastic pipe and the
As the other poster said, the water will expand, but it will come up, and
not go out. If the pin/s are in there, there won't be much water, and your
biggest problem may be the pins freezing in the down position, trapped by
Actually, the plastic is probably a much better suggestion than the
metal...and, in thinking about it a little, I'm not so much against the
"through the slab" suggestion--w/ just these two small diameter holes
the amount of water can't be <that> much...I was recalling a driveway in
TN on a steep slope (imagine that in E TN :) ) where the expansion
joints allowed a ton of water between the slabs which eroded underneath
them...but there was a lot more area for water intrusion.
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