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Old 09-12-2016, 01:22 AM   #16
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Re: Sinking driveway repair


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Originally Posted by de-nagorg View Post
Is there a chance that you have an old mine void under there?

As a teenager in the 70's, I worked in some underground mines in the eastern side of Ut.

And I know that there were abandoned mines on both the West and Eastern sides.

Do you remember a few years back when Rock Springs Wy. was trying to fill all those old voids underneath the city? Major fiasco.

It is possible that you are built atop an old mine, some of them went for miles and branched off quite a ways either way.

This is just a thought that I had when reading this, I have seen mines cave in like this and cause havoc on unsuspecting houses built above.


ED
I will have to look up that rock springs fiasco, I don't think I remember but
...Oh wow, I hope there is no mine void under here, if so I'm hosed!

So far its just buried wood and a rumor of an old water well on my block, where that is exactly, I have no idea, a neighbor that has since moved out told me this a while back.
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Old 09-12-2016, 01:39 AM   #17
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Re: Sinking driveway repair


Digging down sounds expensive, backhoe, large excavator and auger alike. This hole is huge, almost like its a toilet, literally swallowing up everything, so odd...
A bridge is not what I want but its probably what it will end up being based on my budget and without proper digging and engineering, I estimated around $1,000-1,200 for a DIY from start to finish.

Here is the next video below, kinda short, but it updates the project a bit, funny how things can end up interfering with a tool rental time, I guess i'm glad I had nothing rented at this stage? Hahahah

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Old 09-12-2016, 02:33 AM   #18
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Re: Sinking driveway repair


Oh and the "Boss" I refer to in the vid is my wife.
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Old 09-12-2016, 08:17 PM   #19
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Re: Sinking driveway repair


that is a "digging" shovel. get yourself a "transfer" shovel.

damn, on the door. wth happened ?
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Old 09-15-2016, 10:41 AM   #20
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Re: Sinking driveway repair


we repaired 1 where the bldr had created a trash pit under the driveway,,, instead of bringing in a trak-hoe to dig out , we cast a 8" 'bridge' w/dble mat # 6 bar over the trashpit,,, also cast steel-reinforced grade beams on either side,,, worked out well for the last 8yrs

i was for digging out the trash but it wasn't my $$$ OR my house
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Old 09-15-2016, 02:16 PM   #21
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Re: Sinking driveway repair


Thanks for the tip on the shovel, I should have bought one! I became down to just hand tossing larger chunks in that wheel barrow though. (I may still get one yet.)
I was thinking about asphalt fill in there, but decided against it later on.

Yeah so my garage door pulley cable decided to pop off when the door was on the way up without telling me. Then on the way down, it did not wind correctly, ripping the door off and thankfully not on my car. It took a day to get back on but DIY saved some $

I think bridging this is a good idea by others, especially on a budget, but ill do what I can to the subgrade...
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Old 09-15-2016, 03:24 PM   #22
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Re: Sinking driveway repair


I know you are trying to save money, but some professional help maybe needed. If that is a low spot, water is going to continue to drain through there and keep undermining whatever you put in there. Where does the water go when it rains? With the concrete up, a drain may be needed to carry that water away. With fill and a good drain, that might help.
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Old 09-15-2016, 10:19 PM   #23
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Re: Sinking driveway repair


After watching a video and seeing those other areas where you probed I really question any type of repair doing you much good. I really think it would be money well spent to get a soils to take a look at your problem. You may even want to just talk to your local building officials and get some feedback from them.
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Old 09-16-2016, 08:39 AM   #24
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Re: Sinking driveway repair


I think bridging is a good idea to, but based on your last video, it looks like you have a few more sections of slab to remove in order to be able to bridge
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Old 09-17-2016, 03:10 PM   #25
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Re: Sinking driveway repair


In this video the real mystery behind this sinking has been revealed, and a costly one to find out about in addition to the wood being buried. My suspicion was unfortunately confirmed .
This problem is too costly to be a DIY as far as fixing the real problem is concerned and too much to pay someone else to fix in addition to all the flat work.
I will do what I am able with a limited budget to fix this as a DIY, my focus has shifted to just trying to fill it up and repair the subgrade the best I can and bridge this area the best I can or know how/figure out.

Soils test would have been nice but geotechnical engineers say they will not touch the project until I dig to the bottom to find out whats going on, and now that I know what the problem is without digging, I'm sure they wont do it until its sealed...which I don't plan to because I cant afford to.

Flatwork contractor says they will do it now on this stage but they say they will not guarantee their work (understandably) still say its a liability and their cost includes my demolition. $1500 quoted plus minus just for the concrete finish work. but its hard work and they need to make a living too so I understand.

I will be doing the flatwork as well on this DIY. I am reading up on concrete finishing at this point in the video as well.

Short demolition update video below if you fancy.

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Old 09-17-2016, 07:55 PM   #26
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Re: Sinking driveway repair


Wow, that sucks.
Any laws in your state about not sealing the well properly?
The previous home owner should have done so.
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Old 09-17-2016, 08:41 PM   #27
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Re: Sinking driveway repair


Would that be covered by disclosure law, worth a try.
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Old 09-18-2016, 07:04 AM   #28
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Re: Sinking driveway repair


ok, so there was/is a well hole where you were filling , correct ? and this well was washing out under the slab. but, the ground is not wet currently, correct ?
so, how is this well eating out under the slab ? just vibrations from cars getting the dirt/whatever to fall down the hole ?
this well hole, how big is the hole ? is it pipe lined ?
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Old 09-18-2016, 03:11 PM   #29
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Re: Sinking driveway repair


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Originally Posted by Fix'n it View Post
ok, so there was/is a well hole where you were filling , correct ? and this well was washing out under the slab. but, the ground is not wet currently, correct ?
so, how is this well eating out under the slab ? just vibrations from cars getting the dirt/whatever to fall down the hole ?
this well hole, how big is the hole ? is it pipe lined ?
If the well is tied to the aquifer, water goes thru the cracks in the slab, down to the aquifer and out. This leaves a constantly empty hole for water to flow and bring soil/dirt with it.
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Old 09-18-2016, 03:53 PM   #30
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Re: Sinking driveway repair


Dyin' for more details , here !!!

1. What kind of well was it ? How deep , wide ???

2. Why can't you cap it ?

3. Unless you have some kind of strange drainage pattern , why would there be wash/erosion ? Doesn't Utah get like 3" of rain a year ???

I'm not getting the "big picture" here ..........
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