Labels:hakham | monitor | stairs OCR: Development of the Bell Footing Overview Drilled concrete piers are rather recent development for History of footings foundations Expansive soils (clay} react to moisture tc an Development of ithe rains the expansive soil Bell Footing extreme time of heavy Pre-molded bell absorbs moisture and expands sometimes over footings inches in height. In times of drought, the soil will contract, Review due to moisture loss just as much. This type of soil References fluctuation in will reek havoc with buildings foundation. TEST In the early 1920 an engineer VV.E Simpson, San Antonio Texas theorized that if foundations could supported Jevels below the zone of seasonal moisture variations (which in San Antonio might be 25 feet or more deep) buildings could be protected from the destructive forces of so ...
