Do it yourself foundation lift

[Me2]

Hello all, I recently had an issue with my workshop sinking around 80mm at one end. I did engage a consultant to look at a soulution that involve micro strata stabalization of the sub clay and then lifting level using an injected polyurethane foam. The terms of the contract had many loop holes on the warranty and with a price tag of over $20,000AU I looked at way to do this myself. After alot of research I decided to sink piles 2 meters down under the slab and lift the slab from the piles. I did have a Geo-Tech survey done to establish the depth of the piles which was at a minimum of 1.5 meters. The piles where 165mm in diameter but I wanted to increase the bearing area at the base of the piles so designed a hand operated 'Bell Mouth Tool', these are also known as 'Under Reaming Tools'. I based my design on a number of different configuration I found on the net. As I always say "why reinvent the wheel" when the concept is already being used. I did make a number of Video's showing the process from beginning to end and a number of the video's show the tool being used to 'Bell Mouth' out the base of the pile before filling with cement. I did this over 4 episodes starting at - (the first video also shows how I lifted the foundation/slab of my house)

Its over 12 months ago since I did this work and I survey every month to check for any movement. Initially I had around 4mm - 5mm of drop which I expected as it settled but since the drop it has been as solid as I rock. I did this work with all my machines still in position and can now comfortably go ahead with installing a larger Lathe and Mill.
I've attached a couple of photo's as below to show some of the detail.