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Old 02-27-2012, 03:37 PM   #1
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threading cable under concrete walkway


I have a need to thread some ground wire under an existing concrete walkway about 3' length. Was wondering if there is a good way to do it without undermining the walkway.

Thanks

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Old 02-27-2012, 04:28 PM   #2
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threading cable under concrete walkway


Water blast it---

Dig a hole along side the slab--and another where you want the wire to come out--

Rig up a length of 1/2" or 3/4" PVC pipe to your garden hose---and start pushing that pipe under the slab while the water is blasting---

Fast--efficient and cheap---Pipe could be left under the slab as a conduit,if you wish.--Mike---

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Old 02-27-2012, 09:49 PM   #3
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threading cable under concrete walkway


Great, thanks
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Old 02-27-2012, 09:58 PM   #4
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threading cable under concrete walkway


But I worry that might loosen the dirt under the slab and cause concrete cracking in the future
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Old 02-27-2012, 11:10 PM   #5
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threading cable under concrete walkway


Get a cement saw and cut what you need out lay down some PVC pipe for a conduit and your put your wire in the pipe back fill with new cement. that would be the best way.

Last edited by Nailbags; 02-27-2012 at 11:14 PM.
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Old 02-27-2012, 11:14 PM   #6
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threading cable under concrete walkway


Dig hole big enough to work in. Flatten end of steel pipe. Drive pipe under walk while turning with pipe wrench, this stops pipe from wandering. Cut off end of pipe and insert plastic bushings, run wire. I've done 10 feet this way.
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Old 02-27-2012, 11:15 PM   #7
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threading cable under concrete walkway


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Originally Posted by Nailbags View Post
Get a cement saw and cut what you need out lay down some PVC pipe for a conduit and your put your wire in the pipe back fill with new cement. that would be the best way.
most certainly not. my concrete is so beautiful and perfect (done it myself), i don't wanna have a patch. i think i'd rather donate a kidney or something.

but thanks for the idea.
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Old 02-27-2012, 11:22 PM   #8
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threading cable under concrete walkway


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most certainly not. my concrete is so beautiful and perfect (done it myself), i don't wanna have a patch. i think i'd rather donate a kidney or something.

but thanks for the idea.
OK do it the hard way.
"Dig hole big enough to work in. Flatten end of steel pipe. Drive pipe under walk while turning with pipe wrench, this stops pipe from wandering. Cut off end of pipe and insert plastic bushings, run wire. I've done 10 feet this way."
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Old 02-28-2012, 12:04 AM   #9
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threading cable under concrete walkway


Drive pipe with sledgehammer!
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Old 02-28-2012, 12:07 PM   #10
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threading cable under concrete walkway


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OK do it the hard way.
"Dig hole big enough to work in. Flatten end of steel pipe. Drive pipe under walk while turning with pipe wrench, this stops pipe from wandering. Cut off end of pipe and insert plastic bushings, run wire. I've done 10 feet this way."
I haven't had any success this way. It seems like I always have something in the way at my starting end and wind up heading deeper. I know other people that it's worked for though.
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Old 02-28-2012, 01:44 PM   #11
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threading cable under concrete walkway


Drive rod or pipe with sledgehammer or use a garden auger
at a 30 degree angle from the horiz. for 1.7', then pull out rod or pipe with a comealong.
Do same on other side.
Both holes meet in the middle. No undermining going on because the dirt spreads the downward force from the sidewalk around the hole.

Mark the length first on the rod/pipe/auger.

Last edited by Yoyizit; 02-28-2012 at 01:50 PM.
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Old 02-28-2012, 03:08 PM   #12
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threading cable under concrete walkway


It's going to vary, depending on soil conditions. For hard packed soils, water blasting works well, and if you do that, it's really handy to put a valve between the hose and the pipe, so that you have control of the flow right where you want it. For lighter soils, where the water may displace more soil than desired, I have used a piece of conduit a bit longer than what I actually needed, cut four V's in the leadng edge, to give it some teeth, leaving enough on the trailing end to get a pipe wrench on it, then, once it's through, cut off the ends and install the bushings. A good bite with the pipe wrench will allow you to turn and push simultaneously. I can't recall having had to do this in heavy clay, but suspect that you might need a bit more "umph", in which case you can probably rent a hand auger from your local rental shop.

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