Technology and step -by -step instructions for the construction of a step foundation
It happens that the soil suitable for the foundation is located under the proposed house unevenly or occupies only part of the desired area. This happens when the site is located at the site of mining, swamps, etc. This is fraught with troubles: uneven precipitation of the building, cracks, and even by the “separation” of its fragments.
If the ground foundation has precisely such properties, the construction is complicated. It is necessary to find out the depths of the supporting layer of a sufficient area, the angle of its inclination. After that, the foundation tape is arranged on this layer.
But this is not the only solution to the problem. It happens that it is much easier and more economical to choose a weak soil (peat, river nanos, etc. p.) to the desired depth and replace it, say, with coarse -grained sand. Crushed stone can also be a suitable replacement. The substitutes are poured in layers, up to half a meter thick, and each layer is well tamped. So it turns out the foundation called step.
Often preliminary calculations show that microsa will be cheaper than the complete replacement of the soil. They can be sandy in a geotextile shell or concrete). Instead of piles, you can arrange departure wells. Piles are good when the strip foundation should be done either very wide or very deep. In these cases, it is necessary to remove large volumes of soil, reinforce the walls of the foundation, build retaining walls and other.