Weight convsion - Excavation of soil

[gls1]

Hi All,

I am looking to quote for excavation of soil from 39mtr x 30mtr at 200mm deep, please can anybody tell me how much weight roughly and lorry loads away PLEASE.

Then same again to stone up at 150mm leaving rest for tarmac.

[Pablo]

ballpark figures are 8m3 for a 6 wheeler and 10m3 for an 8 wheeler. You'll need either 30 6 wheelers or 23 8 wheelers but I'd allow another 4 or 5 just to keep you safe because even an inch to deep and you've got a lot more spoil on your hands. We can't guess the weight unless we know what you're digging it's best to work off volume and and my sums assume soil clay or old paving if it's a concrete pad then the volume will be more. It'll take about 350 tons of stone to backfill but if you need more spoil lorries you'll need more stone.



Edited By Pablo on 1324160296

[DNgroundworks]

What calculation do you use Pablo?

[Tony McC]

I normally work on 1.7 tonnes/m³ for soil and allow 7m³ for 6wheelers and 9m³ for 8 wheelers. These values are based on 30-odd years of experience and they have generally served me well. Obv, some soils, esp clayey ones, can be heavier and others (peaty) can be lighter, but it sort of averages out.

Also be aware of bulking - 1m³ of excavated soil will amass to closer to 1.3m³ when put into a skip or wagon, althoughh the values I give above relate to 'in the ground' calculations rather than 'when dug'.

[DNgroundworks]

So with bulking, its more like 2t per cube?

[Dave_L]

I do hope it is okay to post this link, seems useful

Bulking of excavated material calculator

[lutonlagerlout]

my ball park for hand dig is 3 blokes will dig 3m3 per day in clay
this fills a 6 yd skip,but 6yds is 4.5M3
so its roughly 50% bulking in clay
cheers LLL :;):

[Bob_A]

I normally work on 1.7 tonnes/m³ for soil and allow 7m³ for 6wheelers and 9m³ for 8 wheelers. These values are based on 30-odd years of experience and they have generally served me well. Obv, some soils, esp clayey ones, can be heavier and others (peaty) can be lighter, but it sort of averages out.

Also be aware of bulking - 1m³ of excavated soil will amass to closer to 1.3m³ when put into a skip or wagon, althoughh the values I give above relate to 'in the ground' calculations rather than 'when dug'.

I haven't got mine to hand at the moment but I think there's something like that in Tony's book.

[Pablo]

my ball park for hand dig is 3 blokes will dig 3m3 per day in clay
this fills a 6 yd skip,but 6yds is 4.5M3
so its roughly 50% bulking in clay
cheers LLL :;):

Yeah I reckon most of my waste bulks by 50% to Tony. I work off what my haulage contrator tells me he has scales on his trucks and the tipping gear is light so the 8 and 10m3 rule seems to work for me. I loaded out a carpark extension last year it was measured at 290m3 and it took 30 8 wheelers. Another way of working it is to assume it bulks by 1.5 and then that bulked material averages about 1.4tons. 290x1.5x1.4 =609 tons. An 8 wheeler takes 20ish tons so thats 609 divided by 20 =30.4 loads. It's a good way of measuring for skips etc on medium sized jobs.
I've been thinking about your job GLS I think it would be a good idea to just scrape the topsoil remove 3/4 of it and use the rest to dress the edges and build upwards. It'll save you and the client thousands of pounds and could make you the most competative quote by a long way. If you can get away with raising the levels like this it would make sense to do it although I would add a layer of terram just to keep you right.

[gls1]

Many Thanks to all for the replies, this site is most helpful when it comes to these issues.

Hope you all had a good xmas and wish you all a very happy new year and a prosperous one aswell.