Preparation of shoe plans. they can have rectangular section; staggered or conically narrowed. their dimensions are in relation to the load they have to bear; the resistance to the ground. for practicality a minimum height is adopted for concrete foundations of approximately 3 dm. if the heights are greater they are given a stepped form taking into account the angle of distribution of the pressures. in the event that the earth tended to crumble or the foundation should be staggered; formwork will be used. if the foundations are made of rammed concrete; they can be concreted without needing them. if the foundation work should be interrupted; it is recommended to cut the vertical joint in steps to achieve a correct connection with the next section. also placing armor irons will reinforce this union. cut are dimensions and specifications. autocad - dwg.