The deep foundation, normally, dismissal opening of the digging of foundation, consisting, for example, in an element cravado by means of a beat-prop. CHARACTERISTICS? Load transmitted to the ground for pressures under the base of the foundation (tip) and attrition throughout the lateral surface (shaft). It is seats in depth, in relation to the adjacent, superior land to the double of its lesser dimension in plant (D > 2B) e, at least, 3 m. If you have read about BSA already – you may have come to the same conclusion. Magnitude and direction of the actions. Responsibility of the workmanship. Presence of thick ground layers soft.
Very resistant presence of layers of ground or with mataces. Possibility of negative attrition. Level d? high water. Sensitivity of the neighbors and vibrations (cravao of props and foundations of machines). CRITERIA FOR CHOICE OF the TYPE OF DEEP FOUNDATIONS Are diverse the 0 variable to be considered for the choice of the type of foundation. In a first stage, she is necessary to analyze the criteria technician that condition the choice for a type or another one of foundation. The main criteria are: (1) Topography of the area: Topographical survey (planialtimtrico); Data on slopes and hillsides in the land (or that they can reach the land); Data on erosions (or preoccupying evolutions in the geomorfologia). (2) Data geologic-geotcnicos: Inquiry of the subsoil (to the times in two stages: preliminary and to complement); Variability of the layers and the depth of each one of them; Existence of layers resistant or you accumulated; Compressibility and resistance of ground; Position of level d water; Other geologic and geotcnicos data (maps, aerial photos and aerophotogrammetry surveys, articles on experiences in the area, publications of the CPRM, etc.). (3) Data of the structure to construct: Type and use that the new workmanship will have; Structural system (hiperestaticidade, flexibility, etc.); Constructive system (conventional or daily pay-molded); Loads (Action in the foundations).