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Thread: Pile Under Reamer/Bell Mouth Tool

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    Me2
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    Pile Under Reamer/Bell Mouth Tool

    This is a tool I made a couple of years ago for Bell Mouthing the base of piles I sunk through my workshop floor (29 in total). The back of the workshop slab had sunk over 80mm and was continuing to sink at a rate of 1mm per month. I had sort the advice of professionals experienced in slab lifting and clay stabilization but at a cost of $22,000 AU this was out of the question. The guarantee for this work was like a colander, full of outs for the contractor with all the onus for any issues back on me. I organized for a Geo-Tech sample and report to be undertaken with the results (as I had assumed) coming back as unstable clay down to 1.5 Meters. I needed to increase the bearing area of any piles I sunk to ensure no movement of the slab once re-leveled and under load. As a result I designed and made a hand operated Under Reamer/Bell Mouth Tool to open out the base of the piles to 500mm from a pile diameter of 170mm to achieve this higher rated bearing load for each pile. It has now been 18 months since I completed this work and I can say that the slab is now rock solid with no movement other than some initial re-settling.



    Part 1 of the Bell Mouth Tool build



    Part 2 of the Bell Mouth Tool build



    Showing the Bell Mouth Tool in action



    The initial kick off video to the Slab Lift Series.

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  2. The Following 2 Users Say Thank You to Me2 For This Useful Post:

    Crusty (Oct 28, 2019), Jon (Oct 21, 2019)

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    peter_351's Tools
    Hi Me2 , love your Utube channel , what suburb/state are you in Australia ? you certainly took on a big undertakings of works to rectify the concrete slab sink. Keep up the good work

    Cheers from Melbourne Australia

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    Me2
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    G'Day Peter, just down the road in Geelong.
    Cam

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    how are you going to actually lift the slab, or is this simply an effort at stabilization?
    Great video!
    Thanks
    Doug

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    did you do a video on how you leveled the slab?

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    Me2
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    G'Day Nitrous, yep if you have a look at the video's you will see how I lifted the slab and re-leveled it using the home made strong backs. It is now within +-6mm all over using the water level. I did a similar thing to my house when the slab broke its back and put a huge gap in the brickwork 12 years ago. Even today you cannot pick where it was, the perfect repair.
    Cam



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