On 09/09/2020 21:48, Brian Gaff (Sofa) wrote:
So were you economising in concrete?
Brian
No. There's probably rather more than 4.5 cu m there. I measured it
carefully, and the base is spot on. I had previously read (somewhere)
that the base should be just larger than the building. mCormaic's site
says 150mm. Lidget Compton say 3" larger all around.
The question remains unanswered (apart from "sound"), unfortunately. If
I need to do anything about it, I would rather know now, when I have
some work to do welding up trusses, which will take time, during which
more concrete could set.
What I am worried about is that the edge may give way, or the keel
deflect and "rotate".
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"Chris Bacon" wrote in message
...
Asked this over at Cormaic's, but no joy (maybe (much!) laterrrr, but
panic on, so here now). This is the slab I've just made with my Aldi
concrete mixer).
Nominal 6000mm by 5000 mm prefab garage for use as garden shed (by my
measurements it will be 6020 by 5035 actualsize).
Slab is 6050 by 5050.
Have I mucked it up and made it too small to use?
The "Plain ConcreteHardstanding" section of (pavingexpert) suggests at
leasat 150mm between edge of slab and garage structure. I've got 15mm,
give or take a couple of mil.
DATA (if required):
ASCII art attempt at floor slab section:
.-------------------//----------------,
| // | 200mm
| --------//-------- |
|__________| // |_________|
600mm
The edges (keels) of the slab are 200mm deep, 600mm wide, all around,
changing to 100+mm in the middle, with A142 mesh.
Corner post weight 100kg, side post weight 70kg, section weight 36kg
each
4 sections per bay so 144kg/bay. 6 bays per side 5 bays for back.
Therefore weight of concrete structure each side is ~1414kg, back is
1160,
front will be much less because mostly 4 x side-hinged doors, roof
structure will be angle iron + Sterling board + corrugated iron.