INSTALLATION TORQUE AND SHAFT RESISTANCE OF SCREWED STEEL PILE WITH SPIRAL WINGS

Abstract

 In order to evaluate the bearing capacity of screwed pile with spiral wings, four full-scale pile load tests including axial compression and uplift tests in sand & clay deposits were carried out. We focused on the installation torque and shaft resistance of the piles, and obtained the following conclusions.
 (1) The shaft resistance of the pile can be determined by the shear strength of cylindrical surface whose diameter is D_w,
 (2) There is a fairly-well defined correlation between shaft resistance and installation torque even in real ground, and
 (3) The shaft resistance of this pile can be estimated using the installation torque.