manet42 wrote:The hedgehog is the bottom of the concrete: crushed tiles, bed of pebbles ... etc.
... and spreading a layer of lean concrete over it!
manet42 wrote:it is not worth asking the question if the soil is hard and the sledge (hedgehog) is done in the rules of the art (as they say).
... it is not enough that the soil is "hard", the most important is that it is homogeneous. It is better such a soil, a soil with "hard" parts, but not homogeneous ....:
http://www.francetv.fr/info/l-effondrem ... 55429.html
manet42 wrote:Good evening;
I seem to have made no confusion ..... [...]
I therefore maintain that placing the 4 feet of a silo 5T on such a slab is not a problem.
I built my silo in the basement without BE in accordance with the usual rules of construction. No trouble.
... no trouble if "homogeneous" soil, otherwise, with a load of several tons, which "moves" with time, there may be local destabilization.
If we are dealing with a "write off"(But I did not go there) do not forget to add all the weight of the construction that is above, (+) accidental loads and other safety margins (+) the 5 tons punctual distribution!
Added to this are the local frost conditions. There this point is not clear (it is said above that it is in the basement, but it also speaks of "garage" ... so point to watch ...)
What can be done afterwards, to know if the ground is homogeneous under the raft foundation? What about local conditions => immediate proximity to a body of water, a water table, a watercourse => wet soil? Who does the drainage? Is the ground around it level? Or on a hill? Does the current construction show any cracks? Where? Of what importance? If so, is there the possible presence of a significant sloping roadway? How important is heavy-vehicle traffic? (Vibration, runoff water) etc ...
Which company made the construction? Have there ever been extensions to this construction? How has concrete been implemented? ... Many questions that deserve reflection and that I see absent from your remarks ...
You see, nothing is simple in the BE .. What slices with someone behind his keyboard and does not engage his legal responsibility if he omits some "details,", Since entrenched behind the anonymity offered by the internet.
In addition to the study of all these parameters and precedents, I remain on the solution of Ahmed (distributed load).
And the silo is 5 tons spread on 4 points, it's still the weight of five mini-bus like Toyota Hi-Ace, so I suggest to put half of the load the first year, just to stabilize the ground, if we do not know exactly how it is done below ... By precautionary principle.