Groundhog tunnel under garage slab


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Old 08-05-15, 05:39 AM
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Groundhog tunnel under garage slab

I've got groundhog problems at my place. But this post isn't about controlling them.

I'm concerned about the structural integrity of my new concrete floor. The garage is just under a year old, and this tunnel goes in at least 6 feet as far as I can tell.

Can I pack gravel/dirt in there, or somehow pump concrete in?

I just fear I'll have a car up on jack stands one day and have a cave in.

FWIW the concrete is 4~ of sawcut, fiber reinforced with a limestone base.





 
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Old 08-05-15, 05:56 AM
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Only concrete would stop him from returning, to the same spot. It would take a lot of concrete to fill the hole. Did you plan to mix it yourself or have a truck pump it?
 
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Old 08-05-15, 07:05 AM
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I don't even know. By biggest concern is not having the floor cave in later down the road.
 
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Old 08-05-15, 07:44 AM
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I'd start throwing dirt/gravel in the hole and see how much you can get in there. Exercise in futility, of course, if the gopher is still around.
 
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Old 08-05-15, 07:52 AM
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Do you know if they used footings? If so how many & what kind? I hope that they didn't just float the slab. What's the length & width, of the slab?
 
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Old 08-05-15, 08:23 AM
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No footings. It's just a floating slab in a pole barn type garage
 
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Old 08-05-15, 08:33 AM
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Where is the concrete slab? I only see pressure treated lumber. Did you build a wood retaining wall then pour a slab on top? If so I think that would make properly filling the tunnels (yes, it's probably more than just a straight in single tunnel) more important.

1. You can just pack in gravel as far and as best you can.

2. Many plumbers have cameras on the end of long umbilical cables. They could send the camera in and give you an idea how extensive the tunneling is and with that info you could better determine how much trouble to go to in filling the tunnels.

3. Have a concrete pumper or mud jacking company come in a pump the tunnels full of concrete or grout under pressure to try and reach all the nooks and crannies.
 
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Old 08-05-15, 09:16 AM
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Correct. They put posts in the ground and run tongue and groove pt lumber around them just at grade. Then there is a limestone subbase with a floating slab on top. The hog dug under those pt boards. I'm going to borrow a inspection camera from work and try to see how deep the tunnel goes.

Really hoping to get lucky and it just goes in and stops.
 
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Old 08-06-15, 07:30 AM
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Be careful when pumping grout in the voids under the slab. The last thing you want is for the slab to be lifted appreciable, as it's likely to crack and break up when doing so.

Meaning don't hire amateurs.
 
 

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