Replies

1. 
   Guest_ | Sep 19, 2000 03:03am | #1

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   w.w.grainger.

   I think it's
   http://www.grainger.com

2. 
   erik_andersen | Sep 26, 2000 06:00am | #2

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   You can easily fabricate your own screw jacks out of threadbare, nuts, and steel plate stock. However, for residential or light commercial/industrial underpinning/leveling purposes, 10 to 20 tons per jack seems way too high a load, because the localized stress concentration would be way too high for whatever foundation you are lifting, and would likely cause problems when you start lifting it (e.g. cracking concrete grade beams).

   A reasonable underpinning load would be more in the range of 2 to 4 kips (1 to 2 tons). I think you might want to consider increasing the number of underpinning piles, thereby reducing the load on each pile/screw jack assembly.

   Erik Andersen, P.E.
   Edmonds, Washington

3. 
   Guest_ | Sep 26, 2000 06:56am | #3

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   last week's Post Tool flier had them on the front or rear page. I think a 20 ton was around $100. Joe H

1. 
   Guest_ | Sep 26, 2000 09:18am | #4

   *I was going to say, "apparently anywhere and everywhere"....But then I remembered, my name isn't Jack.b : )

1. 
   Guest_ | Sep 26, 2000 02:30pm | #5

   *Erik:Just cause you've got a 20 ton jack doesn't mean you've got to lift 20 tons with it. I've got a couple of 60 ton jacks (that's 14 gajillaruds for the engineers) that sure make light work of lifting a house.Oh, wait a second, I just reread your post. You're probably talking about those screw in the ground pilings. I think C. Clark is asking about real screw jacks, for lifting.

1. 
   Guest_ | Sep 26, 2000 04:18pm | #6

   *jack uses all the jacks jack has....jacks favorites are always jacks that are lifting much less than they are rated for...when jacking fifty thousand pound objects and more, just be sure to block up close to your jacks and try not to get more than a shim high in case all comes back down.final note...jacks can be dangerousnear the streamaj

1. 
   Guest_ | Sep 26, 2000 05:55pm | #7

   *Too much overkill Jack:Threaded rod and a rubberband is all you need.

2. 
   Guest_ | Sep 26, 2000 10:15pm | #8

   *maybe a package of rubber bands?near the trickle,aj

3. 
   Guest_ | Sep 26, 2000 10:35pm | #9

   *Naw, if you put a whole package under there, the house would bounce up and down when you let it back down.

4. 
   Guest_ | Sep 27, 2000 12:46am | #10

   *Luka...you're right...I forgot to mention the jello that is used to dampen the spring rate....precisely aged cherry has worked here in the Adirondacks but it may be a regional issue.near the trickle,aj

5. 
   Guest_ | Sep 27, 2000 04:25am | #11

   *Cherry ?Out here in the great northwet we use apples. You have to find the right combination of granny smith, golden delish and macintosh to get just the right 'squish' when you set the frame back down. Do it right and you don't even need the rubber bands...

6. 
   Guest_ | Sep 27, 2000 04:54am | #12

   *I think there are different styles, but if you are talking about the type with the tapered base, such as these shown at Screw Jacks , then I have seen them at most of the tool auctions I have attended and in most of the old used machinery places I have wandered through. Picked up a pair of probably 20 tonners for $15 each at a local auction. BTW, there was an episode on "This Old House" that I happened to see (not a regular watcher) in which they were jacking up the side of the house to repair a mud sill. They had the most motly assortment of jacks that I have every seen - they had a jack about every 12" and had all kinds of small hydraulic jacks, automotive jacks, and I guess anything they could scrounge...

7. 
   Guest_ | Sep 27, 2000 04:57am | #13

   *Seems like a LOT of trouble and expense to go to, to lift a house on-line--a cup-and-a-half of virtual anti-gravity from the cyber store ought to do the trick, more if you're on AOL.

8. 
   Guest_ | Sep 27, 2000 05:12am | #14

   *http://www.harborfreight.com/cpi/taf/Displayitem.taf?itemnumber=5533The headquarters of cheap junk with some tools mixed in. Joe H

9. 
   Guest_ | Sep 27, 2000 05:41pm | #16

   *Joe - surprisingly, not all of their cheap stuff is total junk. And while Harbor Freight does have a range of bottle jacks, when I checked earlier, I could find no screw jacks...

4. 
   C._Clark | Sep 27, 2000 05:41pm | #15

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   Does anyone know where to buy 10 and 20 ton screw jacks suitable for lifting houses online?
   Thanks, C. Clark