Architectural engineering soil injections with sodium silicate (‘waterglass’) are only effective if they are applied in a layer of soil consisting of sand or very fine-grained gravel. Soil surveys must therefore show whether this condition is met and if so, the depth at which the suitable soil layers lie. If recent soil survey results are available that meet our standards, an injection plan can be drawn up on the basis of these. In all other cases, soil samples must be taken first. These are examined by a specialised laboratory and, if necessary, are expressed in terms of gradations. The number of soil samples to be taken will depend partly on the size of the pit or the expectations regarding the geological composition of the soil at the location.
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