fill under slab

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fill under slab

Postby Tom Mc » Wed May 29, 2013 6:30 am

How do we get the toposurface to fill up under a slab floor? Better still, how do we show an area of clean, compacted fill below a slab?
Thanks for any comments or thoughts.
Attachments
Capture.JPG
picture showing toposurface that does not fill up the area below the slab
Capture.JPG (59.05 KiB) Viewed 490 times
Tom Mc
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Re: fill under slab

Postby Conman » Tue Jun 04, 2013 12:02 pm

assume your finsihed floor level is at zero elevation.
draw topsurface 4 points to form a square -150.
Modify a building pad structure and material to show your 200mm of clean compacted fill.
Draw building pad in location of your floor slab and offset down from level the thickness of your floor slab.

Building pads are the only thing that cut into toposurfaces. Just show the surrounding ground higher than you ffl and the pad will cut into it and fill the gap.
hope this makes sense
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Re: fill under slab

Postby Tom Mc » Wed Jun 05, 2013 12:07 am

Thanks Conman, yes that all seems to make sense, will go and give it a try now.
Best regards, Tom.
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Re: fill under slab

Postby Tom Mc » Wed Jun 05, 2013 12:20 am

Hi Conman, I applied the method you described, and it filled up to the underside of the slab, however, there remains a line showing the original contour of the land. Do you have any idea why this would be so?
Capture.JPG
picture showing new fill under slab, but the old level is still visible as a distinct line
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Tom Mc
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Re: fill under slab

Postby Conman » Thu Jun 06, 2013 8:05 am

Assuming that you are building everything above EGL (which your drawing shows) just modify your floor structure to include the 200mm hard core. This will not get rid of the thick black line though because that is the original EGL of the toposurface.

alternatively modify your toposurface so that it is at 0 elevation (your FFL) then do the building pad thing as per the earlier post -this will mean that your foundations will then be below EGL too but the thick black line representing EGL will be at FFL outside the building and not be visible underneath it because the pad will have 'cut' into the toposurface.
Let me know how you go on.
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