saveasteading Posted October 16 Share Posted October 16 13 hours ago, Alan Ambrose said: they have to go less deep than they thought Yes. It is plus and minus. But the quote will be a fixed sum for turning up and all the design and management, plus a sum per pile unit, so the + and- for depth are not the whole story, and are based on the actual cost of time and materials. 1 Link to comment Share on other sites More sharing options...
Jodie Posted October 16 Author Share Posted October 16 Thanks again Gus. I really appreciate your advice. The builder is the owner, he’s building to sell. We had our foundations vibro compacted. It was done in a few hours and been perfect for 21 years up to now. Link to comment Share on other sites More sharing options...
ToughButterCup Posted October 17 Share Posted October 17 7 hours ago, Jodie said: .... We had our foundations vibro compacted. It was done in a few hours and been perfect for 21 years up to now. That's what we did. 52 columns, took a day from start to finish. Since that process is quicker and cheaper, and there's far less vibration, it begs the question - why not ? 1 Link to comment Share on other sites More sharing options...
saveasteading Posted October 17 Share Posted October 17 2 hours ago, ToughButterCup said: begs the question - why not ? Not always suitable. Some designers don't know about it or they don't know the advantages. Little piling companies only do what they do. One of the unsung advantages is the absence of the filthy mess made when soil is removed by driven or auger piles. 1 Link to comment Share on other sites More sharing options...
ToughButterCup Posted October 17 Share Posted October 17 3 hours ago, saveasteading said: ... One of the unsung advantages [of vibro compacted columns ] is the absence of the filthy mess made when soil is removed by driven or auger piles. Here's another .... I found that the compacted columns of stone act as soakaways..... I couldn't believe it when - by accident - I left a hose running above a partially exposed column. The water just disappeared . I think the column was about 5m deep and about 400mm wide. Link to comment Share on other sites More sharing options...
saveasteading Posted October 17 Share Posted October 17 12 minutes ago, ToughButterCup said: columns of stone act as soakaways..... And undermined the ground below, which tends to be loose. OK by accident, not in quantity. Link to comment Share on other sites More sharing options...
ToughButterCup Posted October 17 Share Posted October 17 13 minutes ago, saveasteading said: And undermined the ground below, which tends to be loose. OK by accident, not in quantity. Ours is alluvial clay set (in parts) on a sandstone incursion. My God the clay can stick to a digger shovel. I had to buy (have made) a proper clay spade . It was little more than a simple hook (no sides) and the hook bit of it looked like a sieve. Link to comment Share on other sites More sharing options...
saveasteading Posted October 17 Share Posted October 17 32 minutes ago, ToughButterCup said: was little more than a simple hook (no sides) and the hook bit of it looked like a sieve. Nope, I need a picture. Link to comment Share on other sites More sharing options...
ToughButterCup Posted October 18 Share Posted October 18 17 hours ago, saveasteading said: Nope, I need a picture. I'll try and find one. I sold my digger with it's buckets to deserving couple of BuildHubbers a couple of years ago - and regretted it ever since... This isn't the one, but it's close Link to comment Share on other sites More sharing options...
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