Lifting a sidewalk slab?

Depending on the geometry of your particular installation, do think of using a hydraulic jack to lift one corner of your slab, then run timbers or pipes underneath, and move the jack to the next contact point. You will probably have to dig a fair amount under the slab to slip in your jack, and put a stout piece of 2 by 6 under it as a platform. Most car hydraulic jacks will lift 2 tons easily. The bottle shaped jacks have a small footprint, but they must be set in 8 inches or so under the slab, lower-profile versions may need as little as 4 inches of headroom under the slab. The hardest part of this is digging the access hole. I used this technique to demolish a misaligned slab which was funneling water into an angle of a basement wall. One 36 inch long side fronted on a gravel drive, so it was easy to dig up and put the jack underneath. I put a few 6 x 6 timbers under each end, then after a few mighty hammer blows, the slab was in manageable pieces. Originally I was intending to move the slab into a better position, but found it was easier to demolish the old slab and pour a new one in proper alignment.
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