ABSTRACT
In the case of screwed piles, the problem is more complex. The pile can not be designed for an arbitrary bearing capacity, particularly too high bearing capacity. During design stage the engineer should be aware whether an installation of screwed pile of given bearing capacity is possible to be executed by accessible devices. Present experience shows that both, tabular values of technological coefficients as well as q and t resistances existing in Polish Piling Code are not suitable for screwed piles. The design of this pile type requires more precise geotechnical data, preferably obtained from CPT or CPTU tests.
